14 files changed, 4821 insertions, 1072 deletions

diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index f63ccb0a598..13f2d19793e 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -6,6 +6,9 @@ config HAVE_KVM
 config HAVE_KVM_IRQCHIP
        bool
 
+config HAVE_KVM_IRQ_ROUTING
+       bool
+
 config HAVE_KVM_EVENTFD
        bool
        select EVENTFD
@@ -18,3 +21,16 @@ config KVM_MMIO
 
 config KVM_ASYNC_PF
        bool
+
+# Toggle to switch between direct notification and batch job
+config KVM_ASYNC_PF_SYNC
+       bool
+
+config HAVE_KVM_MSI
+       bool
+
+config HAVE_KVM_CPU_RELAX_INTERCEPT
+       bool
+
+config KVM_VFIO
+       bool
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
new file mode 100644
index 00000000000..22fa819a9b6
--- /dev/null
+++ b/virt/kvm/arm/arch_timer.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/cpu.h>
+#include <linux/of_irq.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+
+#include <clocksource/arm_arch_timer.h>
+#include <asm/arch_timer.h>
+
+#include <kvm/arm_vgic.h>
+#include <kvm/arm_arch_timer.h>
+
+static struct timecounter *timecounter;
+static struct workqueue_struct *wqueue;
+static unsigned int host_vtimer_irq;
+
+static cycle_t kvm_phys_timer_read(void)
+{
+	return timecounter->cc->read(timecounter->cc);
+}
+
+static bool timer_is_armed(struct arch_timer_cpu *timer)
+{
+	return timer->armed;
+}
+
+/* timer_arm: as in "arm the timer", not as in ARM the company */
+static void timer_arm(struct arch_timer_cpu *timer, u64 ns)
+{
+	timer->armed = true;
+	hrtimer_start(&timer->timer, ktime_add_ns(ktime_get(), ns),
+		      HRTIMER_MODE_ABS);
+}
+
+static void timer_disarm(struct arch_timer_cpu *timer)
+{
+	if (timer_is_armed(timer)) {
+		hrtimer_cancel(&timer->timer);
+		cancel_work_sync(&timer->expired);
+		timer->armed = false;
+	}
+}
+
+static void kvm_timer_inject_irq(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	timer->cntv_ctl |= ARCH_TIMER_CTRL_IT_MASK;
+	kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+			    timer->irq->irq,
+			    timer->irq->level);
+}
+
+static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id)
+{
+	struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)dev_id;
+
+	/*
+	 * We disable the timer in the world switch and let it be
+	 * handled by kvm_timer_sync_hwstate(). Getting a timer
+	 * interrupt at this point is a sure sign of some major
+	 * breakage.
+	 */
+	pr_warn("Unexpected interrupt %d on vcpu %p\n", irq, vcpu);
+	return IRQ_HANDLED;
+}
+
+static void kvm_timer_inject_irq_work(struct work_struct *work)
+{
+	struct kvm_vcpu *vcpu;
+
+	vcpu = container_of(work, struct kvm_vcpu, arch.timer_cpu.expired);
+	vcpu->arch.timer_cpu.armed = false;
+	kvm_timer_inject_irq(vcpu);
+}
+
+static enum hrtimer_restart kvm_timer_expire(struct hrtimer *hrt)
+{
+	struct arch_timer_cpu *timer;
+	timer = container_of(hrt, struct arch_timer_cpu, timer);
+	queue_work(wqueue, &timer->expired);
+	return HRTIMER_NORESTART;
+}
+
+/**
+ * kvm_timer_flush_hwstate - prepare to move the virt timer to the cpu
+ * @vcpu: The vcpu pointer
+ *
+ * Disarm any pending soft timers, since the world-switch code will write the
+ * virtual timer state back to the physical CPU.
+ */
+void kvm_timer_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	/*
+	 * We're about to run this vcpu again, so there is no need to
+	 * keep the background timer running, as we're about to
+	 * populate the CPU timer again.
+	 */
+	timer_disarm(timer);
+}
+
+/**
+ * kvm_timer_sync_hwstate - sync timer state from cpu
+ * @vcpu: The vcpu pointer
+ *
+ * Check if the virtual timer was armed and either schedule a corresponding
+ * soft timer or inject directly if already expired.
+ */
+void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+	cycle_t cval, now;
+	u64 ns;
+
+	if ((timer->cntv_ctl & ARCH_TIMER_CTRL_IT_MASK) ||
+		!(timer->cntv_ctl & ARCH_TIMER_CTRL_ENABLE))
+		return;
+
+	cval = timer->cntv_cval;
+	now = kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
+
+	BUG_ON(timer_is_armed(timer));
+
+	if (cval <= now) {
+		/*
+		 * Timer has already expired while we were not
+		 * looking. Inject the interrupt and carry on.
+		 */
+		kvm_timer_inject_irq(vcpu);
+		return;
+	}
+
+	ns = cyclecounter_cyc2ns(timecounter->cc, cval - now);
+	timer_arm(timer, ns);
+}
+
+void kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu,
+			  const struct kvm_irq_level *irq)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	/*
+	 * The vcpu timer irq number cannot be determined in
+	 * kvm_timer_vcpu_init() because it is called much before
+	 * kvm_vcpu_set_target(). To handle this, we determine
+	 * vcpu timer irq number when the vcpu is reset.
+	 */
+	timer->irq = irq;
+}
+
+void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	INIT_WORK(&timer->expired, kvm_timer_inject_irq_work);
+	hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	timer->timer.function = kvm_timer_expire;
+}
+
+static void kvm_timer_init_interrupt(void *info)
+{
+	enable_percpu_irq(host_vtimer_irq, 0);
+}
+
+int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	switch (regid) {
+	case KVM_REG_ARM_TIMER_CTL:
+		timer->cntv_ctl = value;
+		break;
+	case KVM_REG_ARM_TIMER_CNT:
+		vcpu->kvm->arch.timer.cntvoff = kvm_phys_timer_read() - value;
+		break;
+	case KVM_REG_ARM_TIMER_CVAL:
+		timer->cntv_cval = value;
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	switch (regid) {
+	case KVM_REG_ARM_TIMER_CTL:
+		return timer->cntv_ctl;
+	case KVM_REG_ARM_TIMER_CNT:
+		return kvm_phys_timer_read() - vcpu->kvm->arch.timer.cntvoff;
+	case KVM_REG_ARM_TIMER_CVAL:
+		return timer->cntv_cval;
+	}
+	return (u64)-1;
+}
+
+static int kvm_timer_cpu_notify(struct notifier_block *self,
+				unsigned long action, void *cpu)
+{
+	switch (action) {
+	case CPU_STARTING:
+	case CPU_STARTING_FROZEN:
+		kvm_timer_init_interrupt(NULL);
+		break;
+	case CPU_DYING:
+	case CPU_DYING_FROZEN:
+		disable_percpu_irq(host_vtimer_irq);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block kvm_timer_cpu_nb = {
+	.notifier_call = kvm_timer_cpu_notify,
+};
+
+static const struct of_device_id arch_timer_of_match[] = {
+	{ .compatible	= "arm,armv7-timer",	},
+	{ .compatible	= "arm,armv8-timer",	},
+	{},
+};
+
+int kvm_timer_hyp_init(void)
+{
+	struct device_node *np;
+	unsigned int ppi;
+	int err;
+
+	timecounter = arch_timer_get_timecounter();
+	if (!timecounter)
+		return -ENODEV;
+
+	np = of_find_matching_node(NULL, arch_timer_of_match);
+	if (!np) {
+		kvm_err("kvm_arch_timer: can't find DT node\n");
+		return -ENODEV;
+	}
+
+	ppi = irq_of_parse_and_map(np, 2);
+	if (!ppi) {
+		kvm_err("kvm_arch_timer: no virtual timer interrupt\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	err = request_percpu_irq(ppi, kvm_arch_timer_handler,
+				 "kvm guest timer", kvm_get_running_vcpus());
+	if (err) {
+		kvm_err("kvm_arch_timer: can't request interrupt %d (%d)\n",
+			ppi, err);
+		goto out;
+	}
+
+	host_vtimer_irq = ppi;
+
+	err = __register_cpu_notifier(&kvm_timer_cpu_nb);
+	if (err) {
+		kvm_err("Cannot register timer CPU notifier\n");
+		goto out_free;
+	}
+
+	wqueue = create_singlethread_workqueue("kvm_arch_timer");
+	if (!wqueue) {
+		err = -ENOMEM;
+		goto out_free;
+	}
+
+	kvm_info("%s IRQ%d\n", np->name, ppi);
+	on_each_cpu(kvm_timer_init_interrupt, NULL, 1);
+
+	goto out;
+out_free:
+	free_percpu_irq(ppi, kvm_get_running_vcpus());
+out:
+	of_node_put(np);
+	return err;
+}
+
+void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
+{
+	struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
+
+	timer_disarm(timer);
+}
+
+int kvm_timer_init(struct kvm *kvm)
+{
+	if (timecounter && wqueue) {
+		kvm->arch.timer.cntvoff = kvm_phys_timer_read();
+		kvm->arch.timer.enabled = 1;
+	}
+
+	return 0;
+}
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
new file mode 100644
index 00000000000..476d3bf540a
--- /dev/null
+++ b/virt/kvm/arm/vgic.c
@@ -0,0 +1,2035 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/cpu.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/uaccess.h>
+
+#include <linux/irqchip/arm-gic.h>
+
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+/*
+ * How the whole thing works (courtesy of Christoffer Dall):
+ *
+ * - At any time, the dist->irq_pending_on_cpu is the oracle that knows if
+ *   something is pending
+ * - VGIC pending interrupts are stored on the vgic.irq_state vgic
+ *   bitmap (this bitmap is updated by both user land ioctls and guest
+ *   mmio ops, and other in-kernel peripherals such as the
+ *   arch. timers) and indicate the 'wire' state.
+ * - Every time the bitmap changes, the irq_pending_on_cpu oracle is
+ *   recalculated
+ * - To calculate the oracle, we need info for each cpu from
+ *   compute_pending_for_cpu, which considers:
+ *   - PPI: dist->irq_state & dist->irq_enable
+ *   - SPI: dist->irq_state & dist->irq_enable & dist->irq_spi_target
+ *   - irq_spi_target is a 'formatted' version of the GICD_ICFGR
+ *     registers, stored on each vcpu. We only keep one bit of
+ *     information per interrupt, making sure that only one vcpu can
+ *     accept the interrupt.
+ * - The same is true when injecting an interrupt, except that we only
+ *   consider a single interrupt at a time. The irq_spi_cpu array
+ *   contains the target CPU for each SPI.
+ *
+ * The handling of level interrupts adds some extra complexity. We
+ * need to track when the interrupt has been EOIed, so we can sample
+ * the 'line' again. This is achieved as such:
+ *
+ * - When a level interrupt is moved onto a vcpu, the corresponding
+ *   bit in irq_active is set. As long as this bit is set, the line
+ *   will be ignored for further interrupts. The interrupt is injected
+ *   into the vcpu with the GICH_LR_EOI bit set (generate a
+ *   maintenance interrupt on EOI).
+ * - When the interrupt is EOIed, the maintenance interrupt fires,
+ *   and clears the corresponding bit in irq_active. This allow the
+ *   interrupt line to be sampled again.
+ */
+
+#define VGIC_ADDR_UNDEF		(-1)
+#define IS_VGIC_ADDR_UNDEF(_x)  ((_x) == VGIC_ADDR_UNDEF)
+
+#define PRODUCT_ID_KVM		0x4b	/* ASCII code K */
+#define IMPLEMENTER_ARM		0x43b
+#define GICC_ARCH_VERSION_V2	0x2
+
+/* Physical address of vgic virtual cpu interface */
+static phys_addr_t vgic_vcpu_base;
+
+/* Virtual control interface base address */
+static void __iomem *vgic_vctrl_base;
+
+static struct device_node *vgic_node;
+
+#define ACCESS_READ_VALUE	(1 << 0)
+#define ACCESS_READ_RAZ		(0 << 0)
+#define ACCESS_READ_MASK(x)	((x) & (1 << 0))
+#define ACCESS_WRITE_IGNORED	(0 << 1)
+#define ACCESS_WRITE_SETBIT	(1 << 1)
+#define ACCESS_WRITE_CLEARBIT	(2 << 1)
+#define ACCESS_WRITE_VALUE	(3 << 1)
+#define ACCESS_WRITE_MASK(x)	((x) & (3 << 1))
+
+static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu);
+static void vgic_update_state(struct kvm *kvm);
+static void vgic_kick_vcpus(struct kvm *kvm);
+static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg);
+static u32 vgic_nr_lr;
+
+static unsigned int vgic_maint_irq;
+
+static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x,
+				int cpuid, u32 offset)
+{
+	offset >>= 2;
+	if (!offset)
+		return x->percpu[cpuid].reg;
+	else
+		return x->shared.reg + offset - 1;
+}
+
+static int vgic_bitmap_get_irq_val(struct vgic_bitmap *x,
+				   int cpuid, int irq)
+{
+	if (irq < VGIC_NR_PRIVATE_IRQS)
+		return test_bit(irq, x->percpu[cpuid].reg_ul);
+
+	return test_bit(irq - VGIC_NR_PRIVATE_IRQS, x->shared.reg_ul);
+}
+
+static void vgic_bitmap_set_irq_val(struct vgic_bitmap *x, int cpuid,
+				    int irq, int val)
+{
+	unsigned long *reg;
+
+	if (irq < VGIC_NR_PRIVATE_IRQS) {
+		reg = x->percpu[cpuid].reg_ul;
+	} else {
+		reg =  x->shared.reg_ul;
+		irq -= VGIC_NR_PRIVATE_IRQS;
+	}
+
+	if (val)
+		set_bit(irq, reg);
+	else
+		clear_bit(irq, reg);
+}
+
+static unsigned long *vgic_bitmap_get_cpu_map(struct vgic_bitmap *x, int cpuid)
+{
+	if (unlikely(cpuid >= VGIC_MAX_CPUS))
+		return NULL;
+	return x->percpu[cpuid].reg_ul;
+}
+
+static unsigned long *vgic_bitmap_get_shared_map(struct vgic_bitmap *x)
+{
+	return x->shared.reg_ul;
+}
+
+static u32 *vgic_bytemap_get_reg(struct vgic_bytemap *x, int cpuid, u32 offset)
+{
+	offset >>= 2;
+	BUG_ON(offset > (VGIC_NR_IRQS / 4));
+	if (offset < 8)
+		return x->percpu[cpuid] + offset;
+	else
+		return x->shared + offset - 8;
+}
+
+#define VGIC_CFG_LEVEL	0
+#define VGIC_CFG_EDGE	1
+
+static bool vgic_irq_is_edge(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int irq_val;
+
+	irq_val = vgic_bitmap_get_irq_val(&dist->irq_cfg, vcpu->vcpu_id, irq);
+	return irq_val == VGIC_CFG_EDGE;
+}
+
+static int vgic_irq_is_enabled(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	return vgic_bitmap_get_irq_val(&dist->irq_enabled, vcpu->vcpu_id, irq);
+}
+
+static int vgic_irq_is_active(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	return vgic_bitmap_get_irq_val(&dist->irq_active, vcpu->vcpu_id, irq);
+}
+
+static void vgic_irq_set_active(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 1);
+}
+
+static void vgic_irq_clear_active(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	vgic_bitmap_set_irq_val(&dist->irq_active, vcpu->vcpu_id, irq, 0);
+}
+
+static int vgic_dist_irq_is_pending(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	return vgic_bitmap_get_irq_val(&dist->irq_state, vcpu->vcpu_id, irq);
+}
+
+static void vgic_dist_irq_set(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	vgic_bitmap_set_irq_val(&dist->irq_state, vcpu->vcpu_id, irq, 1);
+}
+
+static void vgic_dist_irq_clear(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	vgic_bitmap_set_irq_val(&dist->irq_state, vcpu->vcpu_id, irq, 0);
+}
+
+static void vgic_cpu_irq_set(struct kvm_vcpu *vcpu, int irq)
+{
+	if (irq < VGIC_NR_PRIVATE_IRQS)
+		set_bit(irq, vcpu->arch.vgic_cpu.pending_percpu);
+	else
+		set_bit(irq - VGIC_NR_PRIVATE_IRQS,
+			vcpu->arch.vgic_cpu.pending_shared);
+}
+
+static void vgic_cpu_irq_clear(struct kvm_vcpu *vcpu, int irq)
+{
+	if (irq < VGIC_NR_PRIVATE_IRQS)
+		clear_bit(irq, vcpu->arch.vgic_cpu.pending_percpu);
+	else
+		clear_bit(irq - VGIC_NR_PRIVATE_IRQS,
+			  vcpu->arch.vgic_cpu.pending_shared);
+}
+
+static u32 mmio_data_read(struct kvm_exit_mmio *mmio, u32 mask)
+{
+	return *((u32 *)mmio->data) & mask;
+}
+
+static void mmio_data_write(struct kvm_exit_mmio *mmio, u32 mask, u32 value)
+{
+	*((u32 *)mmio->data) = value & mask;
+}
+
+/**
+ * vgic_reg_access - access vgic register
+ * @mmio:   pointer to the data describing the mmio access
+ * @reg:    pointer to the virtual backing of vgic distributor data
+ * @offset: least significant 2 bits used for word offset
+ * @mode:   ACCESS_ mode (see defines above)
+ *
+ * Helper to make vgic register access easier using one of the access
+ * modes defined for vgic register access
+ * (read,raz,write-ignored,setbit,clearbit,write)
+ */
+static void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
+			    phys_addr_t offset, int mode)
+{
+	int word_offset = (offset & 3) * 8;
+	u32 mask = (1UL << (mmio->len * 8)) - 1;
+	u32 regval;
+
+	/*
+	 * Any alignment fault should have been delivered to the guest
+	 * directly (ARM ARM B3.12.7 "Prioritization of aborts").
+	 */
+
+	if (reg) {
+		regval = *reg;
+	} else {
+		BUG_ON(mode != (ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED));
+		regval = 0;
+	}
+
+	if (mmio->is_write) {
+		u32 data = mmio_data_read(mmio, mask) << word_offset;
+		switch (ACCESS_WRITE_MASK(mode)) {
+		case ACCESS_WRITE_IGNORED:
+			return;
+
+		case ACCESS_WRITE_SETBIT:
+			regval |= data;
+			break;
+
+		case ACCESS_WRITE_CLEARBIT:
+			regval &= ~data;
+			break;
+
+		case ACCESS_WRITE_VALUE:
+			regval = (regval & ~(mask << word_offset)) | data;
+			break;
+		}
+		*reg = regval;
+	} else {
+		switch (ACCESS_READ_MASK(mode)) {
+		case ACCESS_READ_RAZ:
+			regval = 0;
+			/* fall through */
+
+		case ACCESS_READ_VALUE:
+			mmio_data_write(mmio, mask, regval >> word_offset);
+		}
+	}
+}
+
+static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
+			     struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	u32 reg;
+	u32 word_offset = offset & 3;
+
+	switch (offset & ~3) {
+	case 0:			/* GICD_CTLR */
+		reg = vcpu->kvm->arch.vgic.enabled;
+		vgic_reg_access(mmio, &reg, word_offset,
+				ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+		if (mmio->is_write) {
+			vcpu->kvm->arch.vgic.enabled = reg & 1;
+			vgic_update_state(vcpu->kvm);
+			return true;
+		}
+		break;
+
+	case 4:			/* GICD_TYPER */
+		reg  = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
+		reg |= (VGIC_NR_IRQS >> 5) - 1;
+		vgic_reg_access(mmio, &reg, word_offset,
+				ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+		break;
+
+	case 8:			/* GICD_IIDR */
+		reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+		vgic_reg_access(mmio, &reg, word_offset,
+				ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+		break;
+	}
+
+	return false;
+}
+
+static bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu,
+			       struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	vgic_reg_access(mmio, NULL, offset,
+			ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
+	return false;
+}
+
+static bool handle_mmio_set_enable_reg(struct kvm_vcpu *vcpu,
+				       struct kvm_exit_mmio *mmio,
+				       phys_addr_t offset)
+{
+	u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
+				       vcpu->vcpu_id, offset);
+	vgic_reg_access(mmio, reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
+	if (mmio->is_write) {
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+static bool handle_mmio_clear_enable_reg(struct kvm_vcpu *vcpu,
+					 struct kvm_exit_mmio *mmio,
+					 phys_addr_t offset)
+{
+	u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_enabled,
+				       vcpu->vcpu_id, offset);
+	vgic_reg_access(mmio, reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
+	if (mmio->is_write) {
+		if (offset < 4) /* Force SGI enabled */
+			*reg |= 0xffff;
+		vgic_retire_disabled_irqs(vcpu);
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+static bool handle_mmio_set_pending_reg(struct kvm_vcpu *vcpu,
+					struct kvm_exit_mmio *mmio,
+					phys_addr_t offset)
+{
+	u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_state,
+				       vcpu->vcpu_id, offset);
+	vgic_reg_access(mmio, reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_SETBIT);
+	if (mmio->is_write) {
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+static bool handle_mmio_clear_pending_reg(struct kvm_vcpu *vcpu,
+					  struct kvm_exit_mmio *mmio,
+					  phys_addr_t offset)
+{
+	u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_state,
+				       vcpu->vcpu_id, offset);
+	vgic_reg_access(mmio, reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_CLEARBIT);
+	if (mmio->is_write) {
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+static bool handle_mmio_priority_reg(struct kvm_vcpu *vcpu,
+				     struct kvm_exit_mmio *mmio,
+				     phys_addr_t offset)
+{
+	u32 *reg = vgic_bytemap_get_reg(&vcpu->kvm->arch.vgic.irq_priority,
+					vcpu->vcpu_id, offset);
+	vgic_reg_access(mmio, reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+	return false;
+}
+
+#define GICD_ITARGETSR_SIZE	32
+#define GICD_CPUTARGETS_BITS	8
+#define GICD_IRQS_PER_ITARGETSR	(GICD_ITARGETSR_SIZE / GICD_CPUTARGETS_BITS)
+static u32 vgic_get_target_reg(struct kvm *kvm, int irq)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	int i;
+	u32 val = 0;
+
+	irq -= VGIC_NR_PRIVATE_IRQS;
+
+	for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++)
+		val |= 1 << (dist->irq_spi_cpu[irq + i] + i * 8);
+
+	return val;
+}
+
+static void vgic_set_target_reg(struct kvm *kvm, u32 val, int irq)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	int i, c;
+	unsigned long *bmap;
+	u32 target;
+
+	irq -= VGIC_NR_PRIVATE_IRQS;
+
+	/*
+	 * Pick the LSB in each byte. This ensures we target exactly
+	 * one vcpu per IRQ. If the byte is null, assume we target
+	 * CPU0.
+	 */
+	for (i = 0; i < GICD_IRQS_PER_ITARGETSR; i++) {
+		int shift = i * GICD_CPUTARGETS_BITS;
+		target = ffs((val >> shift) & 0xffU);
+		target = target ? (target - 1) : 0;
+		dist->irq_spi_cpu[irq + i] = target;
+		kvm_for_each_vcpu(c, vcpu, kvm) {
+			bmap = vgic_bitmap_get_shared_map(&dist->irq_spi_target[c]);
+			if (c == target)
+				set_bit(irq + i, bmap);
+			else
+				clear_bit(irq + i, bmap);
+		}
+	}
+}
+
+static bool handle_mmio_target_reg(struct kvm_vcpu *vcpu,
+				   struct kvm_exit_mmio *mmio,
+				   phys_addr_t offset)
+{
+	u32 reg;
+
+	/* We treat the banked interrupts targets as read-only */
+	if (offset < 32) {
+		u32 roreg = 1 << vcpu->vcpu_id;
+		roreg |= roreg << 8;
+		roreg |= roreg << 16;
+
+		vgic_reg_access(mmio, &roreg, offset,
+				ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
+		return false;
+	}
+
+	reg = vgic_get_target_reg(vcpu->kvm, offset & ~3U);
+	vgic_reg_access(mmio, &reg, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+	if (mmio->is_write) {
+		vgic_set_target_reg(vcpu->kvm, reg, offset & ~3U);
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+static u32 vgic_cfg_expand(u16 val)
+{
+	u32 res = 0;
+	int i;
+
+	/*
+	 * Turn a 16bit value like abcd...mnop into a 32bit word
+	 * a0b0c0d0...m0n0o0p0, which is what the HW cfg register is.
+	 */
+	for (i = 0; i < 16; i++)
+		res |= ((val >> i) & VGIC_CFG_EDGE) << (2 * i + 1);
+
+	return res;
+}
+
+static u16 vgic_cfg_compress(u32 val)
+{
+	u16 res = 0;
+	int i;
+
+	/*
+	 * Turn a 32bit word a0b0c0d0...m0n0o0p0 into 16bit value like
+	 * abcd...mnop which is what we really care about.
+	 */
+	for (i = 0; i < 16; i++)
+		res |= ((val >> (i * 2 + 1)) & VGIC_CFG_EDGE) << i;
+
+	return res;
+}
+
+/*
+ * The distributor uses 2 bits per IRQ for the CFG register, but the
+ * LSB is always 0. As such, we only keep the upper bit, and use the
+ * two above functions to compress/expand the bits
+ */
+static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
+				struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	u32 val;
+	u32 *reg;
+
+	reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
+				  vcpu->vcpu_id, offset >> 1);
+
+	if (offset & 4)
+		val = *reg >> 16;
+	else
+		val = *reg & 0xffff;
+
+	val = vgic_cfg_expand(val);
+	vgic_reg_access(mmio, &val, offset,
+			ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
+	if (mmio->is_write) {
+		if (offset < 8) {
+			*reg = ~0U; /* Force PPIs/SGIs to 1 */
+			return false;
+		}
+
+		val = vgic_cfg_compress(val);
+		if (offset & 4) {
+			*reg &= 0xffff;
+			*reg |= val << 16;
+		} else {
+			*reg &= 0xffff << 16;
+			*reg |= val;
+		}
+	}
+
+	return false;
+}
+
+static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
+				struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	u32 reg;
+	vgic_reg_access(mmio, &reg, offset,
+			ACCESS_READ_RAZ | ACCESS_WRITE_VALUE);
+	if (mmio->is_write) {
+		vgic_dispatch_sgi(vcpu, reg);
+		vgic_update_state(vcpu->kvm);
+		return true;
+	}
+
+	return false;
+}
+
+#define LR_CPUID(lr)	\
+	(((lr) & GICH_LR_PHYSID_CPUID) >> GICH_LR_PHYSID_CPUID_SHIFT)
+#define LR_IRQID(lr)	\
+	((lr) & GICH_LR_VIRTUALID)
+
+static void vgic_retire_lr(int lr_nr, int irq, struct vgic_cpu *vgic_cpu)
+{
+	clear_bit(lr_nr, vgic_cpu->lr_used);
+	vgic_cpu->vgic_lr[lr_nr] &= ~GICH_LR_STATE;
+	vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
+}
+
+/**
+ * vgic_unqueue_irqs - move pending IRQs from LRs to the distributor
+ * @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs
+ *
+ * Move any pending IRQs that have already been assigned to LRs back to the
+ * emulated distributor state so that the complete emulated state can be read
+ * from the main emulation structures without investigating the LRs.
+ *
+ * Note that IRQs in the active state in the LRs get their pending state moved
+ * to the distributor but the active state stays in the LRs, because we don't
+ * track the active state on the distributor side.
+ */
+static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	int vcpu_id = vcpu->vcpu_id;
+	int i, irq, source_cpu;
+	u32 *lr;
+
+	for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
+		lr = &vgic_cpu->vgic_lr[i];
+		irq = LR_IRQID(*lr);
+		source_cpu = LR_CPUID(*lr);
+
+		/*
+		 * There are three options for the state bits:
+		 *
+		 * 01: pending
+		 * 10: active
+		 * 11: pending and active
+		 *
+		 * If the LR holds only an active interrupt (not pending) then
+		 * just leave it alone.
+		 */
+		if ((*lr & GICH_LR_STATE) == GICH_LR_ACTIVE_BIT)
+			continue;
+
+		/*
+		 * Reestablish the pending state on the distributor and the
+		 * CPU interface.  It may have already been pending, but that
+		 * is fine, then we are only setting a few bits that were
+		 * already set.
+		 */
+		vgic_dist_irq_set(vcpu, irq);
+		if (irq < VGIC_NR_SGIS)
+			dist->irq_sgi_sources[vcpu_id][irq] |= 1 << source_cpu;
+		*lr &= ~GICH_LR_PENDING_BIT;
+
+		/*
+		 * If there's no state left on the LR (it could still be
+		 * active), then the LR does not hold any useful info and can
+		 * be marked as free for other use.
+		 */
+		if (!(*lr & GICH_LR_STATE))
+			vgic_retire_lr(i, irq, vgic_cpu);
+
+		/* Finally update the VGIC state. */
+		vgic_update_state(vcpu->kvm);
+	}
+}
+
+/* Handle reads of GICD_CPENDSGIRn and GICD_SPENDSGIRn */
+static bool read_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
+					struct kvm_exit_mmio *mmio,
+					phys_addr_t offset)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int sgi;
+	int min_sgi = (offset & ~0x3) * 4;
+	int max_sgi = min_sgi + 3;
+	int vcpu_id = vcpu->vcpu_id;
+	u32 reg = 0;
+
+	/* Copy source SGIs from distributor side */
+	for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
+		int shift = 8 * (sgi - min_sgi);
+		reg |= (u32)dist->irq_sgi_sources[vcpu_id][sgi] << shift;
+	}
+
+	mmio_data_write(mmio, ~0, reg);
+	return false;
+}
+
+static bool write_set_clear_sgi_pend_reg(struct kvm_vcpu *vcpu,
+					 struct kvm_exit_mmio *mmio,
+					 phys_addr_t offset, bool set)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int sgi;
+	int min_sgi = (offset & ~0x3) * 4;
+	int max_sgi = min_sgi + 3;
+	int vcpu_id = vcpu->vcpu_id;
+	u32 reg;
+	bool updated = false;
+
+	reg = mmio_data_read(mmio, ~0);
+
+	/* Clear pending SGIs on the distributor */
+	for (sgi = min_sgi; sgi <= max_sgi; sgi++) {
+		u8 mask = reg >> (8 * (sgi - min_sgi));
+		if (set) {
+			if ((dist->irq_sgi_sources[vcpu_id][sgi] & mask) != mask)
+				updated = true;
+			dist->irq_sgi_sources[vcpu_id][sgi] |= mask;
+		} else {
+			if (dist->irq_sgi_sources[vcpu_id][sgi] & mask)
+				updated = true;
+			dist->irq_sgi_sources[vcpu_id][sgi] &= ~mask;
+		}
+	}
+
+	if (updated)
+		vgic_update_state(vcpu->kvm);
+
+	return updated;
+}
+
+static bool handle_mmio_sgi_set(struct kvm_vcpu *vcpu,
+				struct kvm_exit_mmio *mmio,
+				phys_addr_t offset)
+{
+	if (!mmio->is_write)
+		return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
+	else
+		return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, true);
+}
+
+static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
+				  struct kvm_exit_mmio *mmio,
+				  phys_addr_t offset)
+{
+	if (!mmio->is_write)
+		return read_set_clear_sgi_pend_reg(vcpu, mmio, offset);
+	else
+		return write_set_clear_sgi_pend_reg(vcpu, mmio, offset, false);
+}
+
+/*
+ * I would have liked to use the kvm_bus_io_*() API instead, but it
+ * cannot cope with banked registers (only the VM pointer is passed
+ * around, and we need the vcpu). One of these days, someone please
+ * fix it!
+ */
+struct mmio_range {
+	phys_addr_t base;
+	unsigned long len;
+	bool (*handle_mmio)(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
+			    phys_addr_t offset);
+};
+
+static const struct mmio_range vgic_dist_ranges[] = {
+	{
+		.base		= GIC_DIST_CTRL,
+		.len		= 12,
+		.handle_mmio	= handle_mmio_misc,
+	},
+	{
+		.base		= GIC_DIST_IGROUP,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_raz_wi,
+	},
+	{
+		.base		= GIC_DIST_ENABLE_SET,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_set_enable_reg,
+	},
+	{
+		.base		= GIC_DIST_ENABLE_CLEAR,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_clear_enable_reg,
+	},
+	{
+		.base		= GIC_DIST_PENDING_SET,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_set_pending_reg,
+	},
+	{
+		.base		= GIC_DIST_PENDING_CLEAR,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_clear_pending_reg,
+	},
+	{
+		.base		= GIC_DIST_ACTIVE_SET,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_raz_wi,
+	},
+	{
+		.base		= GIC_DIST_ACTIVE_CLEAR,
+		.len		= VGIC_NR_IRQS / 8,
+		.handle_mmio	= handle_mmio_raz_wi,
+	},
+	{
+		.base		= GIC_DIST_PRI,
+		.len		= VGIC_NR_IRQS,
+		.handle_mmio	= handle_mmio_priority_reg,
+	},
+	{
+		.base		= GIC_DIST_TARGET,
+		.len		= VGIC_NR_IRQS,
+		.handle_mmio	= handle_mmio_target_reg,
+	},
+	{
+		.base		= GIC_DIST_CONFIG,
+		.len		= VGIC_NR_IRQS / 4,
+		.handle_mmio	= handle_mmio_cfg_reg,
+	},
+	{
+		.base		= GIC_DIST_SOFTINT,
+		.len		= 4,
+		.handle_mmio	= handle_mmio_sgi_reg,
+	},
+	{
+		.base		= GIC_DIST_SGI_PENDING_CLEAR,
+		.len		= VGIC_NR_SGIS,
+		.handle_mmio	= handle_mmio_sgi_clear,
+	},
+	{
+		.base		= GIC_DIST_SGI_PENDING_SET,
+		.len		= VGIC_NR_SGIS,
+		.handle_mmio	= handle_mmio_sgi_set,
+	},
+	{}
+};
+
+static const
+struct mmio_range *find_matching_range(const struct mmio_range *ranges,
+				       struct kvm_exit_mmio *mmio,
+				       phys_addr_t offset)
+{
+	const struct mmio_range *r = ranges;
+
+	while (r->len) {
+		if (offset >= r->base &&
+		    (offset + mmio->len) <= (r->base + r->len))
+			return r;
+		r++;
+	}
+
+	return NULL;
+}
+
+/**
+ * vgic_handle_mmio - handle an in-kernel MMIO access
+ * @vcpu:	pointer to the vcpu performing the access
+ * @run:	pointer to the kvm_run structure
+ * @mmio:	pointer to the data describing the access
+ *
+ * returns true if the MMIO access has been performed in kernel space,
+ * and false if it needs to be emulated in user space.
+ */
+bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
+		      struct kvm_exit_mmio *mmio)
+{
+	const struct mmio_range *range;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	unsigned long base = dist->vgic_dist_base;
+	bool updated_state;
+	unsigned long offset;
+
+	if (!irqchip_in_kernel(vcpu->kvm) ||
+	    mmio->phys_addr < base ||
+	    (mmio->phys_addr + mmio->len) > (base + KVM_VGIC_V2_DIST_SIZE))
+		return false;
+
+	/* We don't support ldrd / strd or ldm / stm to the emulated vgic */
+	if (mmio->len > 4) {
+		kvm_inject_dabt(vcpu, mmio->phys_addr);
+		return true;
+	}
+
+	offset = mmio->phys_addr - base;
+	range = find_matching_range(vgic_dist_ranges, mmio, offset);
+	if (unlikely(!range || !range->handle_mmio)) {
+		pr_warn("Unhandled access %d %08llx %d\n",
+			mmio->is_write, mmio->phys_addr, mmio->len);
+		return false;
+	}
+
+	spin_lock(&vcpu->kvm->arch.vgic.lock);
+	offset = mmio->phys_addr - range->base - base;
+	updated_state = range->handle_mmio(vcpu, mmio, offset);
+	spin_unlock(&vcpu->kvm->arch.vgic.lock);
+	kvm_prepare_mmio(run, mmio);
+	kvm_handle_mmio_return(vcpu, run);
+
+	if (updated_state)
+		vgic_kick_vcpus(vcpu->kvm);
+
+	return true;
+}
+
+static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	int nrcpus = atomic_read(&kvm->online_vcpus);
+	u8 target_cpus;
+	int sgi, mode, c, vcpu_id;
+
+	vcpu_id = vcpu->vcpu_id;
+
+	sgi = reg & 0xf;
+	target_cpus = (reg >> 16) & 0xff;
+	mode = (reg >> 24) & 3;
+
+	switch (mode) {
+	case 0:
+		if (!target_cpus)
+			return;
+		break;
+
+	case 1:
+		target_cpus = ((1 << nrcpus) - 1) & ~(1 << vcpu_id) & 0xff;
+		break;
+
+	case 2:
+		target_cpus = 1 << vcpu_id;
+		break;
+	}
+
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		if (target_cpus & 1) {
+			/* Flag the SGI as pending */
+			vgic_dist_irq_set(vcpu, sgi);
+			dist->irq_sgi_sources[c][sgi] |= 1 << vcpu_id;
+			kvm_debug("SGI%d from CPU%d to CPU%d\n", sgi, vcpu_id, c);
+		}
+
+		target_cpus >>= 1;
+	}
+}
+
+static int compute_pending_for_cpu(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	unsigned long *pending, *enabled, *pend_percpu, *pend_shared;
+	unsigned long pending_private, pending_shared;
+	int vcpu_id;
+
+	vcpu_id = vcpu->vcpu_id;
+	pend_percpu = vcpu->arch.vgic_cpu.pending_percpu;
+	pend_shared = vcpu->arch.vgic_cpu.pending_shared;
+
+	pending = vgic_bitmap_get_cpu_map(&dist->irq_state, vcpu_id);
+	enabled = vgic_bitmap_get_cpu_map(&dist->irq_enabled, vcpu_id);
+	bitmap_and(pend_percpu, pending, enabled, VGIC_NR_PRIVATE_IRQS);
+
+	pending = vgic_bitmap_get_shared_map(&dist->irq_state);
+	enabled = vgic_bitmap_get_shared_map(&dist->irq_enabled);
+	bitmap_and(pend_shared, pending, enabled, VGIC_NR_SHARED_IRQS);
+	bitmap_and(pend_shared, pend_shared,
+		   vgic_bitmap_get_shared_map(&dist->irq_spi_target[vcpu_id]),
+		   VGIC_NR_SHARED_IRQS);
+
+	pending_private = find_first_bit(pend_percpu, VGIC_NR_PRIVATE_IRQS);
+	pending_shared = find_first_bit(pend_shared, VGIC_NR_SHARED_IRQS);
+	return (pending_private < VGIC_NR_PRIVATE_IRQS ||
+		pending_shared < VGIC_NR_SHARED_IRQS);
+}
+
+/*
+ * Update the interrupt state and determine which CPUs have pending
+ * interrupts. Must be called with distributor lock held.
+ */
+static void vgic_update_state(struct kvm *kvm)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	int c;
+
+	if (!dist->enabled) {
+		set_bit(0, &dist->irq_pending_on_cpu);
+		return;
+	}
+
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		if (compute_pending_for_cpu(vcpu)) {
+			pr_debug("CPU%d has pending interrupts\n", c);
+			set_bit(c, &dist->irq_pending_on_cpu);
+		}
+	}
+}
+
+#define MK_LR_PEND(src, irq)	\
+	(GICH_LR_PENDING_BIT | ((src) << GICH_LR_PHYSID_CPUID_SHIFT) | (irq))
+
+/*
+ * An interrupt may have been disabled after being made pending on the
+ * CPU interface (the classic case is a timer running while we're
+ * rebooting the guest - the interrupt would kick as soon as the CPU
+ * interface gets enabled, with deadly consequences).
+ *
+ * The solution is to examine already active LRs, and check the
+ * interrupt is still enabled. If not, just retire it.
+ */
+static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	int lr;
+
+	for_each_set_bit(lr, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
+		int irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
+
+		if (!vgic_irq_is_enabled(vcpu, irq)) {
+			vgic_retire_lr(lr, irq, vgic_cpu);
+			if (vgic_irq_is_active(vcpu, irq))
+				vgic_irq_clear_active(vcpu, irq);
+		}
+	}
+}
+
+/*
+ * Queue an interrupt to a CPU virtual interface. Return true on success,
+ * or false if it wasn't possible to queue it.
+ */
+static bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	int lr;
+
+	/* Sanitize the input... */
+	BUG_ON(sgi_source_id & ~7);
+	BUG_ON(sgi_source_id && irq >= VGIC_NR_SGIS);
+	BUG_ON(irq >= VGIC_NR_IRQS);
+
+	kvm_debug("Queue IRQ%d\n", irq);
+
+	lr = vgic_cpu->vgic_irq_lr_map[irq];
+
+	/* Do we have an active interrupt for the same CPUID? */
+	if (lr != LR_EMPTY &&
+	    (LR_CPUID(vgic_cpu->vgic_lr[lr]) == sgi_source_id)) {
+		kvm_debug("LR%d piggyback for IRQ%d %x\n",
+			  lr, irq, vgic_cpu->vgic_lr[lr]);
+		BUG_ON(!test_bit(lr, vgic_cpu->lr_used));
+		vgic_cpu->vgic_lr[lr] |= GICH_LR_PENDING_BIT;
+		return true;
+	}
+
+	/* Try to use another LR for this interrupt */
+	lr = find_first_zero_bit((unsigned long *)vgic_cpu->lr_used,
+			       vgic_cpu->nr_lr);
+	if (lr >= vgic_cpu->nr_lr)
+		return false;
+
+	kvm_debug("LR%d allocated for IRQ%d %x\n", lr, irq, sgi_source_id);
+	vgic_cpu->vgic_lr[lr] = MK_LR_PEND(sgi_source_id, irq);
+	vgic_cpu->vgic_irq_lr_map[irq] = lr;
+	set_bit(lr, vgic_cpu->lr_used);
+
+	if (!vgic_irq_is_edge(vcpu, irq))
+		vgic_cpu->vgic_lr[lr] |= GICH_LR_EOI;
+
+	return true;
+}
+
+static bool vgic_queue_sgi(struct kvm_vcpu *vcpu, int irq)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	unsigned long sources;
+	int vcpu_id = vcpu->vcpu_id;
+	int c;
+
+	sources = dist->irq_sgi_sources[vcpu_id][irq];
+
+	for_each_set_bit(c, &sources, VGIC_MAX_CPUS) {
+		if (vgic_queue_irq(vcpu, c, irq))
+			clear_bit(c, &sources);
+	}
+
+	dist->irq_sgi_sources[vcpu_id][irq] = sources;
+
+	/*
+	 * If the sources bitmap has been cleared it means that we
+	 * could queue all the SGIs onto link registers (see the
+	 * clear_bit above), and therefore we are done with them in
+	 * our emulated gic and can get rid of them.
+	 */
+	if (!sources) {
+		vgic_dist_irq_clear(vcpu, irq);
+		vgic_cpu_irq_clear(vcpu, irq);
+		return true;
+	}
+
+	return false;
+}
+
+static bool vgic_queue_hwirq(struct kvm_vcpu *vcpu, int irq)
+{
+	if (vgic_irq_is_active(vcpu, irq))
+		return true; /* level interrupt, already queued */
+
+	if (vgic_queue_irq(vcpu, 0, irq)) {
+		if (vgic_irq_is_edge(vcpu, irq)) {
+			vgic_dist_irq_clear(vcpu, irq);
+			vgic_cpu_irq_clear(vcpu, irq);
+		} else {
+			vgic_irq_set_active(vcpu, irq);
+		}
+
+		return true;
+	}
+
+	return false;
+}
+
+/*
+ * Fill the list registers with pending interrupts before running the
+ * guest.
+ */
+static void __kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int i, vcpu_id;
+	int overflow = 0;
+
+	vcpu_id = vcpu->vcpu_id;
+
+	/*
+	 * We may not have any pending interrupt, or the interrupts
+	 * may have been serviced from another vcpu. In all cases,
+	 * move along.
+	 */
+	if (!kvm_vgic_vcpu_pending_irq(vcpu)) {
+		pr_debug("CPU%d has no pending interrupt\n", vcpu_id);
+		goto epilog;
+	}
+
+	/* SGIs */
+	for_each_set_bit(i, vgic_cpu->pending_percpu, VGIC_NR_SGIS) {
+		if (!vgic_queue_sgi(vcpu, i))
+			overflow = 1;
+	}
+
+	/* PPIs */
+	for_each_set_bit_from(i, vgic_cpu->pending_percpu, VGIC_NR_PRIVATE_IRQS) {
+		if (!vgic_queue_hwirq(vcpu, i))
+			overflow = 1;
+	}
+
+	/* SPIs */
+	for_each_set_bit(i, vgic_cpu->pending_shared, VGIC_NR_SHARED_IRQS) {
+		if (!vgic_queue_hwirq(vcpu, i + VGIC_NR_PRIVATE_IRQS))
+			overflow = 1;
+	}
+
+epilog:
+	if (overflow) {
+		vgic_cpu->vgic_hcr |= GICH_HCR_UIE;
+	} else {
+		vgic_cpu->vgic_hcr &= ~GICH_HCR_UIE;
+		/*
+		 * We're about to run this VCPU, and we've consumed
+		 * everything the distributor had in store for
+		 * us. Claim we don't have anything pending. We'll
+		 * adjust that if needed while exiting.
+		 */
+		clear_bit(vcpu_id, &dist->irq_pending_on_cpu);
+	}
+}
+
+static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	bool level_pending = false;
+
+	kvm_debug("MISR = %08x\n", vgic_cpu->vgic_misr);
+
+	if (vgic_cpu->vgic_misr & GICH_MISR_EOI) {
+		/*
+		 * Some level interrupts have been EOIed. Clear their
+		 * active bit.
+		 */
+		int lr, irq;
+
+		for_each_set_bit(lr, (unsigned long *)vgic_cpu->vgic_eisr,
+				 vgic_cpu->nr_lr) {
+			irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
+
+			vgic_irq_clear_active(vcpu, irq);
+			vgic_cpu->vgic_lr[lr] &= ~GICH_LR_EOI;
+
+			/* Any additional pending interrupt? */
+			if (vgic_dist_irq_is_pending(vcpu, irq)) {
+				vgic_cpu_irq_set(vcpu, irq);
+				level_pending = true;
+			} else {
+				vgic_cpu_irq_clear(vcpu, irq);
+			}
+
+			/*
+			 * Despite being EOIed, the LR may not have
+			 * been marked as empty.
+			 */
+			set_bit(lr, (unsigned long *)vgic_cpu->vgic_elrsr);
+			vgic_cpu->vgic_lr[lr] &= ~GICH_LR_ACTIVE_BIT;
+		}
+	}
+
+	if (vgic_cpu->vgic_misr & GICH_MISR_U)
+		vgic_cpu->vgic_hcr &= ~GICH_HCR_UIE;
+
+	return level_pending;
+}
+
+/*
+ * Sync back the VGIC state after a guest run. The distributor lock is
+ * needed so we don't get preempted in the middle of the state processing.
+ */
+static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int lr, pending;
+	bool level_pending;
+
+	level_pending = vgic_process_maintenance(vcpu);
+
+	/* Clear mappings for empty LRs */
+	for_each_set_bit(lr, (unsigned long *)vgic_cpu->vgic_elrsr,
+			 vgic_cpu->nr_lr) {
+		int irq;
+
+		if (!test_and_clear_bit(lr, vgic_cpu->lr_used))
+			continue;
+
+		irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
+
+		BUG_ON(irq >= VGIC_NR_IRQS);
+		vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
+	}
+
+	/* Check if we still have something up our sleeve... */
+	pending = find_first_zero_bit((unsigned long *)vgic_cpu->vgic_elrsr,
+				      vgic_cpu->nr_lr);
+	if (level_pending || pending < vgic_cpu->nr_lr)
+		set_bit(vcpu->vcpu_id, &dist->irq_pending_on_cpu);
+}
+
+void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return;
+
+	spin_lock(&dist->lock);
+	__kvm_vgic_flush_hwstate(vcpu);
+	spin_unlock(&dist->lock);
+}
+
+void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return;
+
+	spin_lock(&dist->lock);
+	__kvm_vgic_sync_hwstate(vcpu);
+	spin_unlock(&dist->lock);
+}
+
+int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
+{
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+
+	if (!irqchip_in_kernel(vcpu->kvm))
+		return 0;
+
+	return test_bit(vcpu->vcpu_id, &dist->irq_pending_on_cpu);
+}
+
+static void vgic_kick_vcpus(struct kvm *kvm)
+{
+	struct kvm_vcpu *vcpu;
+	int c;
+
+	/*
+	 * We've injected an interrupt, time to find out who deserves
+	 * a good kick...
+	 */
+	kvm_for_each_vcpu(c, vcpu, kvm) {
+		if (kvm_vgic_vcpu_pending_irq(vcpu))
+			kvm_vcpu_kick(vcpu);
+	}
+}
+
+static int vgic_validate_injection(struct kvm_vcpu *vcpu, int irq, int level)
+{
+	int is_edge = vgic_irq_is_edge(vcpu, irq);
+	int state = vgic_dist_irq_is_pending(vcpu, irq);
+
+	/*
+	 * Only inject an interrupt if:
+	 * - edge triggered and we have a rising edge
+	 * - level triggered and we change level
+	 */
+	if (is_edge)
+		return level > state;
+	else
+		return level != state;
+}
+
+static bool vgic_update_irq_state(struct kvm *kvm, int cpuid,
+				  unsigned int irq_num, bool level)
+{
+	struct vgic_dist *dist = &kvm->arch.vgic;
+	struct kvm_vcpu *vcpu;
+	int is_edge, is_level;
+	int enabled;
+	bool ret = true;
+
+	spin_lock(&dist->lock);
+
+	vcpu = kvm_get_vcpu(kvm, cpuid);
+	is_edge = vgic_irq_is_edge(vcpu, irq_num);
+	is_level = !is_edge;
+
+	if (!vgic_validate_injection(vcpu, irq_num, level)) {
+		ret = false;
+		goto out;
+	}
+
+	if (irq_num >= VGIC_NR_PRIVATE_IRQS) {
+		cpuid = dist->irq_spi_cpu[irq_num - VGIC_NR_PRIVATE_IRQS];
+		vcpu = kvm_get_vcpu(kvm, cpuid);
+	}
+
+	kvm_debug("Inject IRQ%d level %d CPU%d\n", irq_num, level, cpuid);
+
+	if (level)
+		vgic_dist_irq_set(vcpu, irq_num);
+	else
+		vgic_dist_irq_clear(vcpu, irq_num);
+
+	enabled = vgic_irq_is_enabled(vcpu, irq_num);
+
+	if (!enabled) {
+		ret = false;
+		goto out;
+	}
+
+	if (is_level && vgic_irq_is_active(vcpu, irq_num)) {
+		/*
+		 * Level interrupt in progress, will be picked up
+		 * when EOId.
+		 */
+		ret = false;
+		goto out;
+	}
+
+	if (level) {
+		vgic_cpu_irq_set(vcpu, irq_num);
+		set_bit(cpuid, &dist->irq_pending_on_cpu);
+	}
+
+out:
+	spin_unlock(&dist->lock);
+
+	return ret;
+}
+
+/**
+ * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
+ * @kvm:     The VM structure pointer
+ * @cpuid:   The CPU for PPIs
+ * @irq_num: The IRQ number that is assigned to the device
+ * @level:   Edge-triggered:  true:  to trigger the interrupt
+ *			      false: to ignore the call
+ *	     Level-sensitive  true:  activates an interrupt
+ *			      false: deactivates an interrupt
+ *
+ * The GIC is not concerned with devices being active-LOW or active-HIGH for
+ * level-sensitive interrupts.  You can think of the level parameter as 1
+ * being HIGH and 0 being LOW and all devices being active-HIGH.
+ */
+int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
+			bool level)
+{
+	if (vgic_update_irq_state(kvm, cpuid, irq_num, level))
+		vgic_kick_vcpus(kvm);
+
+	return 0;
+}
+
+static irqreturn_t vgic_maintenance_handler(int irq, void *data)
+{
+	/*
+	 * We cannot rely on the vgic maintenance interrupt to be
+	 * delivered synchronously. This means we can only use it to
+	 * exit the VM, and we perform the handling of EOIed
+	 * interrupts on the exit path (see vgic_process_maintenance).
+	 */
+	return IRQ_HANDLED;
+}
+
+/**
+ * kvm_vgic_vcpu_init - Initialize per-vcpu VGIC state
+ * @vcpu: pointer to the vcpu struct
+ *
+ * Initialize the vgic_cpu struct and vgic_dist struct fields pertaining to
+ * this vcpu and enable the VGIC for this VCPU
+ */
+int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+	int i;
+
+	if (vcpu->vcpu_id >= VGIC_MAX_CPUS)
+		return -EBUSY;
+
+	for (i = 0; i < VGIC_NR_IRQS; i++) {
+		if (i < VGIC_NR_PPIS)
+			vgic_bitmap_set_irq_val(&dist->irq_enabled,
+						vcpu->vcpu_id, i, 1);
+		if (i < VGIC_NR_PRIVATE_IRQS)
+			vgic_bitmap_set_irq_val(&dist->irq_cfg,
+						vcpu->vcpu_id, i, VGIC_CFG_EDGE);
+
+		vgic_cpu->vgic_irq_lr_map[i] = LR_EMPTY;
+	}
+
+	/*
+	 * By forcing VMCR to zero, the GIC will restore the binary
+	 * points to their reset values. Anything else resets to zero
+	 * anyway.
+	 */
+	vgic_cpu->vgic_vmcr = 0;
+
+	vgic_cpu->nr_lr = vgic_nr_lr;
+	vgic_cpu->vgic_hcr = GICH_HCR_EN; /* Get the show on the road... */
+
+	return 0;
+}
+
+static void vgic_init_maintenance_interrupt(void *info)
+{
+	enable_percpu_irq(vgic_maint_irq, 0);
+}
+
+static int vgic_cpu_notify(struct notifier_block *self,
+			   unsigned long action, void *cpu)
+{
+	switch (action) {
+	case CPU_STARTING:
+	case CPU_STARTING_FROZEN:
+		vgic_init_maintenance_interrupt(NULL);
+		break;
+	case CPU_DYING:
+	case CPU_DYING_FROZEN:
+		disable_percpu_irq(vgic_maint_irq);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block vgic_cpu_nb = {
+	.notifier_call = vgic_cpu_notify,
+};
+
+int kvm_vgic_hyp_init(void)
+{
+	int ret;
+	struct resource vctrl_res;
+	struct resource vcpu_res;
+
+	vgic_node = of_find_compatible_node(NULL, NULL, "arm,cortex-a15-gic");
+	if (!vgic_node) {
+		kvm_err("error: no compatible vgic node in DT\n");
+		return -ENODEV;
+	}
+
+	vgic_maint_irq = irq_of_parse_and_map(vgic_node, 0);
+	if (!vgic_maint_irq) {
+		kvm_err("error getting vgic maintenance irq from DT\n");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	ret = request_percpu_irq(vgic_maint_irq, vgic_maintenance_handler,
+				 "vgic", kvm_get_running_vcpus());
+	if (ret) {
+		kvm_err("Cannot register interrupt %d\n", vgic_maint_irq);
+		goto out;
+	}
+
+	ret = __register_cpu_notifier(&vgic_cpu_nb);
+	if (ret) {
+		kvm_err("Cannot register vgic CPU notifier\n");
+		goto out_free_irq;
+	}
+
+	ret = of_address_to_resource(vgic_node, 2, &vctrl_res);
+	if (ret) {
+		kvm_err("Cannot obtain VCTRL resource\n");
+		goto out_free_irq;
+	}
+
+	vgic_vctrl_base = of_iomap(vgic_node, 2);
+	if (!vgic_vctrl_base) {
+		kvm_err("Cannot ioremap VCTRL\n");
+		ret = -ENOMEM;
+		goto out_free_irq;
+	}
+
+	vgic_nr_lr = readl_relaxed(vgic_vctrl_base + GICH_VTR);
+	vgic_nr_lr = (vgic_nr_lr & 0x3f) + 1;
+
+	ret = create_hyp_io_mappings(vgic_vctrl_base,
+				     vgic_vctrl_base + resource_size(&vctrl_res),
+				     vctrl_res.start);
+	if (ret) {
+		kvm_err("Cannot map VCTRL into hyp\n");
+		goto out_unmap;
+	}
+
+	if (of_address_to_resource(vgic_node, 3, &vcpu_res)) {
+		kvm_err("Cannot obtain VCPU resource\n");
+		ret = -ENXIO;
+		goto out_unmap;
+	}
+
+	if (!PAGE_ALIGNED(vcpu_res.start)) {
+		kvm_err("GICV physical address 0x%llx not page aligned\n",
+			(unsigned long long)vcpu_res.start);
+		ret = -ENXIO;
+		goto out_unmap;
+	}
+
+	if (!PAGE_ALIGNED(resource_size(&vcpu_res))) {
+		kvm_err("GICV size 0x%llx not a multiple of page size 0x%lx\n",
+			(unsigned long long)resource_size(&vcpu_res),
+			PAGE_SIZE);
+		ret = -ENXIO;
+		goto out_unmap;
+	}
+
+	vgic_vcpu_base = vcpu_res.start;
+
+	kvm_info("%s@%llx IRQ%d\n", vgic_node->name,
+		 vctrl_res.start, vgic_maint_irq);
+	on_each_cpu(vgic_init_maintenance_interrupt, NULL, 1);
+
+	goto out;
+
+out_unmap:
+	iounmap(vgic_vctrl_base);
+out_free_irq:
+	free_percpu_irq(vgic_maint_irq, kvm_get_running_vcpus());
+out:
+	of_node_put(vgic_node);
+	return ret;
+}
+
+/**
+ * kvm_vgic_init - Initialize global VGIC state before running any VCPUs
+ * @kvm: pointer to the kvm struct
+ *
+ * Map the virtual CPU interface into the VM before running any VCPUs.  We
+ * can't do this at creation time, because user space must first set the
+ * virtual CPU interface address in the guest physical address space.  Also
+ * initialize the ITARGETSRn regs to 0 on the emulated distributor.
+ */
+int kvm_vgic_init(struct kvm *kvm)
+{
+	int ret = 0, i;
+
+	if (!irqchip_in_kernel(kvm))
+		return 0;
+
+	mutex_lock(&kvm->lock);
+
+	if (vgic_initialized(kvm))
+		goto out;
+
+	if (IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_dist_base) ||
+	    IS_VGIC_ADDR_UNDEF(kvm->arch.vgic.vgic_cpu_base)) {
+		kvm_err("Need to set vgic cpu and dist addresses first\n");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	ret = kvm_phys_addr_ioremap(kvm, kvm->arch.vgic.vgic_cpu_base,
+				    vgic_vcpu_base, KVM_VGIC_V2_CPU_SIZE);
+	if (ret) {
+		kvm_err("Unable to remap VGIC CPU to VCPU\n");
+		goto out;
+	}
+
+	for (i = VGIC_NR_PRIVATE_IRQS; i < VGIC_NR_IRQS; i += 4)
+		vgic_set_target_reg(kvm, 0, i);
+
+	kvm->arch.vgic.ready = true;
+out:
+	mutex_unlock(&kvm->lock);
+	return ret;
+}
+
+int kvm_vgic_create(struct kvm *kvm)
+{
+	int i, vcpu_lock_idx = -1, ret = 0;
+	struct kvm_vcpu *vcpu;
+
+	mutex_lock(&kvm->lock);
+
+	if (kvm->arch.vgic.vctrl_base) {
+		ret = -EEXIST;
+		goto out;
+	}
+
+	/*
+	 * Any time a vcpu is run, vcpu_load is called which tries to grab the
+	 * vcpu->mutex.  By grabbing the vcpu->mutex of all VCPUs we ensure
+	 * that no other VCPUs are run while we create the vgic.
+	 */
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (!mutex_trylock(&vcpu->mutex))
+			goto out_unlock;
+		vcpu_lock_idx = i;
+	}
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		if (vcpu->arch.has_run_once) {
+			ret = -EBUSY;
+			goto out_unlock;
+		}
+	}
+
+	spin_lock_init(&kvm->arch.vgic.lock);
+	kvm->arch.vgic.vctrl_base = vgic_vctrl_base;
+	kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
+	kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;
+
+out_unlock:
+	for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
+		vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
+		mutex_unlock(&vcpu->mutex);
+	}
+
+out:
+	mutex_unlock(&kvm->lock);
+	return ret;
+}
+
+static bool vgic_ioaddr_overlap(struct kvm *kvm)
+{
+	phys_addr_t dist = kvm->arch.vgic.vgic_dist_base;
+	phys_addr_t cpu = kvm->arch.vgic.vgic_cpu_base;
+
+	if (IS_VGIC_ADDR_UNDEF(dist) || IS_VGIC_ADDR_UNDEF(cpu))
+		return 0;
+	if ((dist <= cpu && dist + KVM_VGIC_V2_DIST_SIZE > cpu) ||
+	    (cpu <= dist && cpu + KVM_VGIC_V2_CPU_SIZE > dist))
+		return -EBUSY;
+	return 0;
+}
+
+static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
+			      phys_addr_t addr, phys_addr_t size)
+{
+	int ret;
+
+	if (addr & ~KVM_PHYS_MASK)
+		return -E2BIG;
+
+	if (addr & (SZ_4K - 1))
+		return -EINVAL;
+
+	if (!IS_VGIC_ADDR_UNDEF(*ioaddr))
+		return -EEXIST;
+	if (addr + size < addr)
+		return -EINVAL;
+
+	*ioaddr = addr;
+	ret = vgic_ioaddr_overlap(kvm);
+	if (ret)
+		*ioaddr = VGIC_ADDR_UNDEF;
+
+	return ret;
+}
+
+/**
+ * kvm_vgic_addr - set or get vgic VM base addresses
+ * @kvm:   pointer to the vm struct
+ * @type:  the VGIC addr type, one of KVM_VGIC_V2_ADDR_TYPE_XXX
+ * @addr:  pointer to address value
+ * @write: if true set the address in the VM address space, if false read the
+ *          address
+ *
+ * Set or get the vgic base addresses for the distributor and the virtual CPU
+ * interface in the VM physical address space.  These addresses are properties
+ * of the emulated core/SoC and therefore user space initially knows this
+ * information.
+ */
+int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
+{
+	int r = 0;
+	struct vgic_dist *vgic = &kvm->arch.vgic;
+
+	mutex_lock(&kvm->lock);
+	switch (type) {
+	case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		if (write) {
+			r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
+					       *addr, KVM_VGIC_V2_DIST_SIZE);
+		} else {
+			*addr = vgic->vgic_dist_base;
+		}
+		break;
+	case KVM_VGIC_V2_ADDR_TYPE_CPU:
+		if (write) {
+			r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
+					       *addr, KVM_VGIC_V2_CPU_SIZE);
+		} else {
+			*addr = vgic->vgic_cpu_base;
+		}
+		break;
+	default:
+		r = -ENODEV;
+	}
+
+	mutex_unlock(&kvm->lock);
+	return r;
+}
+
+static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
+				 struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+	u32 reg, mask = 0, shift = 0;
+	bool updated = false;
+
+	switch (offset & ~0x3) {
+	case GIC_CPU_CTRL:
+		mask = GICH_VMCR_CTRL_MASK;
+		shift = GICH_VMCR_CTRL_SHIFT;
+		break;
+	case GIC_CPU_PRIMASK:
+		mask = GICH_VMCR_PRIMASK_MASK;
+		shift = GICH_VMCR_PRIMASK_SHIFT;
+		break;
+	case GIC_CPU_BINPOINT:
+		mask = GICH_VMCR_BINPOINT_MASK;
+		shift = GICH_VMCR_BINPOINT_SHIFT;
+		break;
+	case GIC_CPU_ALIAS_BINPOINT:
+		mask = GICH_VMCR_ALIAS_BINPOINT_MASK;
+		shift = GICH_VMCR_ALIAS_BINPOINT_SHIFT;
+		break;
+	}
+
+	if (!mmio->is_write) {
+		reg = (vgic_cpu->vgic_vmcr & mask) >> shift;
+		mmio_data_write(mmio, ~0, reg);
+	} else {
+		reg = mmio_data_read(mmio, ~0);
+		reg = (reg << shift) & mask;
+		if (reg != (vgic_cpu->vgic_vmcr & mask))
+			updated = true;
+		vgic_cpu->vgic_vmcr &= ~mask;
+		vgic_cpu->vgic_vmcr |= reg;
+	}
+	return updated;
+}
+
+static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
+			     struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+	return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
+}
+
+static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
+				  struct kvm_exit_mmio *mmio,
+				  phys_addr_t offset)
+{
+	u32 reg;
+
+	if (mmio->is_write)
+		return false;
+
+	/* GICC_IIDR */
+	reg = (PRODUCT_ID_KVM << 20) |
+	      (GICC_ARCH_VERSION_V2 << 16) |
+	      (IMPLEMENTER_ARM << 0);
+	mmio_data_write(mmio, ~0, reg);
+	return false;
+}
+
+/*
+ * CPU Interface Register accesses - these are not accessed by the VM, but by
+ * user space for saving and restoring VGIC state.
+ */
+static const struct mmio_range vgic_cpu_ranges[] = {
+	{
+		.base		= GIC_CPU_CTRL,
+		.len		= 12,
+		.handle_mmio	= handle_cpu_mmio_misc,
+	},
+	{
+		.base		= GIC_CPU_ALIAS_BINPOINT,
+		.len		= 4,
+		.handle_mmio	= handle_mmio_abpr,
+	},
+	{
+		.base		= GIC_CPU_ACTIVEPRIO,
+		.len		= 16,
+		.handle_mmio	= handle_mmio_raz_wi,
+	},
+	{
+		.base		= GIC_CPU_IDENT,
+		.len		= 4,
+		.handle_mmio	= handle_cpu_mmio_ident,
+	},
+};
+
+static int vgic_attr_regs_access(struct kvm_device *dev,
+				 struct kvm_device_attr *attr,
+				 u32 *reg, bool is_write)
+{
+	const struct mmio_range *r = NULL, *ranges;
+	phys_addr_t offset;
+	int ret, cpuid, c;
+	struct kvm_vcpu *vcpu, *tmp_vcpu;
+	struct vgic_dist *vgic;
+	struct kvm_exit_mmio mmio;
+
+	offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+	cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
+		KVM_DEV_ARM_VGIC_CPUID_SHIFT;
+
+	mutex_lock(&dev->kvm->lock);
+
+	if (cpuid >= atomic_read(&dev->kvm->online_vcpus)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	vcpu = kvm_get_vcpu(dev->kvm, cpuid);
+	vgic = &dev->kvm->arch.vgic;
+
+	mmio.len = 4;
+	mmio.is_write = is_write;
+	if (is_write)
+		mmio_data_write(&mmio, ~0, *reg);
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		mmio.phys_addr = vgic->vgic_dist_base + offset;
+		ranges = vgic_dist_ranges;
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		mmio.phys_addr = vgic->vgic_cpu_base + offset;
+		ranges = vgic_cpu_ranges;
+		break;
+	default:
+		BUG();
+	}
+	r = find_matching_range(ranges, &mmio, offset);
+
+	if (unlikely(!r || !r->handle_mmio)) {
+		ret = -ENXIO;
+		goto out;
+	}
+
+
+	spin_lock(&vgic->lock);
+
+	/*
+	 * Ensure that no other VCPU is running by checking the vcpu->cpu
+	 * field.  If no other VPCUs are running we can safely access the VGIC
+	 * state, because even if another VPU is run after this point, that
+	 * VCPU will not touch the vgic state, because it will block on
+	 * getting the vgic->lock in kvm_vgic_sync_hwstate().
+	 */
+	kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm) {
+		if (unlikely(tmp_vcpu->cpu != -1)) {
+			ret = -EBUSY;
+			goto out_vgic_unlock;
+		}
+	}
+
+	/*
+	 * Move all pending IRQs from the LRs on all VCPUs so the pending
+	 * state can be properly represented in the register state accessible
+	 * through this API.
+	 */
+	kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
+		vgic_unqueue_irqs(tmp_vcpu);
+
+	offset -= r->base;
+	r->handle_mmio(vcpu, &mmio, offset);
+
+	if (!is_write)
+		*reg = mmio_data_read(&mmio, ~0);
+
+	ret = 0;
+out_vgic_unlock:
+	spin_unlock(&vgic->lock);
+out:
+	mutex_unlock(&dev->kvm->lock);
+	return ret;
+}
+
+static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	int r;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 addr;
+		unsigned long type = (unsigned long)attr->attr;
+
+		if (copy_from_user(&addr, uaddr, sizeof(addr)))
+			return -EFAULT;
+
+		r = kvm_vgic_addr(dev->kvm, type, &addr, true);
+		return (r == -ENODEV) ? -ENXIO : r;
+	}
+
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
+		u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+		u32 reg;
+
+		if (get_user(reg, uaddr))
+			return -EFAULT;
+
+		return vgic_attr_regs_access(dev, attr, &reg, true);
+	}
+
+	}
+
+	return -ENXIO;
+}
+
+static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	int r = -ENXIO;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 addr;
+		unsigned long type = (unsigned long)attr->attr;
+
+		r = kvm_vgic_addr(dev->kvm, type, &addr, false);
+		if (r)
+			return (r == -ENODEV) ? -ENXIO : r;
+
+		if (copy_to_user(uaddr, &addr, sizeof(addr)))
+			return -EFAULT;
+		break;
+	}
+
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: {
+		u32 __user *uaddr = (u32 __user *)(long)attr->addr;
+		u32 reg = 0;
+
+		r = vgic_attr_regs_access(dev, attr, &reg, false);
+		if (r)
+			return r;
+		r = put_user(reg, uaddr);
+		break;
+	}
+
+	}
+
+	return r;
+}
+
+static int vgic_has_attr_regs(const struct mmio_range *ranges,
+			      phys_addr_t offset)
+{
+	struct kvm_exit_mmio dev_attr_mmio;
+
+	dev_attr_mmio.len = 4;
+	if (find_matching_range(ranges, &dev_attr_mmio, offset))
+		return 0;
+	else
+		return -ENXIO;
+}
+
+static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
+{
+	phys_addr_t offset;
+
+	switch (attr->group) {
+	case KVM_DEV_ARM_VGIC_GRP_ADDR:
+		switch (attr->attr) {
+		case KVM_VGIC_V2_ADDR_TYPE_DIST:
+		case KVM_VGIC_V2_ADDR_TYPE_CPU:
+			return 0;
+		}
+		break;
+	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
+		offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+		return vgic_has_attr_regs(vgic_dist_ranges, offset);
+	case KVM_DEV_ARM_VGIC_GRP_CPU_REGS:
+		offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
+		return vgic_has_attr_regs(vgic_cpu_ranges, offset);
+	}
+	return -ENXIO;
+}
+
+static void vgic_destroy(struct kvm_device *dev)
+{
+	kfree(dev);
+}
+
+static int vgic_create(struct kvm_device *dev, u32 type)
+{
+	return kvm_vgic_create(dev->kvm);
+}
+
+struct kvm_device_ops kvm_arm_vgic_v2_ops = {
+	.name = "kvm-arm-vgic",
+	.create = vgic_create,
+	.destroy = vgic_destroy,
+	.set_attr = vgic_set_attr,
+	.get_attr = vgic_get_attr,
+	.has_attr = vgic_has_attr,
+};
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 758e3b36d4c..bf06577fea5 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -49,32 +49,101 @@ static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
 			index = i;
 			break;
 		}
-	if (index < 0) {
+	if (index < 0)
 		printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
-		return 0;
-	}
 
 	return index;
 }
 
-static irqreturn_t kvm_assigned_dev_thread(int irq, void *dev_id)
+static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
 {
 	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+	int ret;
+
+	spin_lock(&assigned_dev->intx_lock);
+	if (pci_check_and_mask_intx(assigned_dev->dev)) {
+		assigned_dev->host_irq_disabled = true;
+		ret = IRQ_WAKE_THREAD;
+	} else
+		ret = IRQ_NONE;
+	spin_unlock(&assigned_dev->intx_lock);
 
-	if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_INTX) {
-		spin_lock(&assigned_dev->intx_lock);
+	return ret;
+}
+
+static void
+kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
+				 int vector)
+{
+	if (unlikely(assigned_dev->irq_requested_type &
+		     KVM_DEV_IRQ_GUEST_INTX)) {
+		spin_lock(&assigned_dev->intx_mask_lock);
+		if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
+			kvm_set_irq(assigned_dev->kvm,
+				    assigned_dev->irq_source_id, vector, 1,
+				    false);
+		spin_unlock(&assigned_dev->intx_mask_lock);
+	} else
+		kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
+			    vector, 1, false);
+}
+
+static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
+{
+	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+
+	if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
+		spin_lock_irq(&assigned_dev->intx_lock);
 		disable_irq_nosync(irq);
 		assigned_dev->host_irq_disabled = true;
-		spin_unlock(&assigned_dev->intx_lock);
+		spin_unlock_irq(&assigned_dev->intx_lock);
 	}
 
-	kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
-		    assigned_dev->guest_irq, 1);
+	kvm_assigned_dev_raise_guest_irq(assigned_dev,
+					 assigned_dev->guest_irq);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef __KVM_HAVE_MSI
+static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
+{
+	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+	int ret = kvm_set_irq_inatomic(assigned_dev->kvm,
+				       assigned_dev->irq_source_id,
+				       assigned_dev->guest_irq, 1);
+	return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
+}
+
+static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
+{
+	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+
+	kvm_assigned_dev_raise_guest_irq(assigned_dev,
+					 assigned_dev->guest_irq);
 
 	return IRQ_HANDLED;
 }
+#endif
 
 #ifdef __KVM_HAVE_MSIX
+static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
+{
+	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
+	int index = find_index_from_host_irq(assigned_dev, irq);
+	u32 vector;
+	int ret = 0;
+
+	if (index >= 0) {
+		vector = assigned_dev->guest_msix_entries[index].vector;
+		ret = kvm_set_irq_inatomic(assigned_dev->kvm,
+					   assigned_dev->irq_source_id,
+					   vector, 1);
+	}
+
+	return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
+}
+
 static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
 {
 	struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
@@ -83,8 +152,7 @@ static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
 
 	if (index >= 0) {
 		vector = assigned_dev->guest_msix_entries[index].vector;
-		kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
-			    vector, 1);
+		kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
 	}
 
 	return IRQ_HANDLED;
@@ -98,17 +166,33 @@ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
 		container_of(kian, struct kvm_assigned_dev_kernel,
 			     ack_notifier);
 
-	kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
+	kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
 
-	/* The guest irq may be shared so this ack may be
-	 * from another device.
-	 */
-	spin_lock(&dev->intx_lock);
-	if (dev->host_irq_disabled) {
-		enable_irq(dev->host_irq);
-		dev->host_irq_disabled = false;
+	spin_lock(&dev->intx_mask_lock);
+
+	if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
+		bool reassert = false;
+
+		spin_lock_irq(&dev->intx_lock);
+		/*
+		 * The guest IRQ may be shared so this ack can come from an
+		 * IRQ for another guest device.
+		 */
+		if (dev->host_irq_disabled) {
+			if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
+				enable_irq(dev->host_irq);
+			else if (!pci_check_and_unmask_intx(dev->dev))
+				reassert = true;
+			dev->host_irq_disabled = reassert;
+		}
+		spin_unlock_irq(&dev->intx_lock);
+
+		if (reassert)
+			kvm_set_irq(dev->kvm, dev->irq_source_id,
+				    dev->guest_irq, 1, false);
 	}
-	spin_unlock(&dev->intx_lock);
+
+	spin_unlock(&dev->intx_mask_lock);
 }
 
 static void deassign_guest_irq(struct kvm *kvm,
@@ -119,7 +203,7 @@ static void deassign_guest_irq(struct kvm *kvm,
 						&assigned_dev->ack_notifier);
 
 	kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
-		    assigned_dev->guest_irq, 0);
+		    assigned_dev->guest_irq, 0, false);
 
 	if (assigned_dev->irq_source_id != -1)
 		kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
@@ -156,7 +240,15 @@ static void deassign_host_irq(struct kvm *kvm,
 		pci_disable_msix(assigned_dev->dev);
 	} else {
 		/* Deal with MSI and INTx */
-		disable_irq(assigned_dev->host_irq);
+		if ((assigned_dev->irq_requested_type &
+		     KVM_DEV_IRQ_HOST_INTX) &&
+		    (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
+			spin_lock_irq(&assigned_dev->intx_lock);
+			pci_intx(assigned_dev->dev, false);
+			spin_unlock_irq(&assigned_dev->intx_lock);
+			synchronize_irq(assigned_dev->host_irq);
+		} else
+			disable_irq(assigned_dev->host_irq);
 
 		free_irq(assigned_dev->host_irq, assigned_dev);
 
@@ -237,15 +329,34 @@ void kvm_free_all_assigned_devices(struct kvm *kvm)
 static int assigned_device_enable_host_intx(struct kvm *kvm,
 					    struct kvm_assigned_dev_kernel *dev)
 {
+	irq_handler_t irq_handler;
+	unsigned long flags;
+
 	dev->host_irq = dev->dev->irq;
-	/* Even though this is PCI, we don't want to use shared
-	 * interrupts. Sharing host devices with guest-assigned devices
-	 * on the same interrupt line is not a happy situation: there
-	 * are going to be long delays in accepting, acking, etc.
+
+	/*
+	 * We can only share the IRQ line with other host devices if we are
+	 * able to disable the IRQ source at device-level - independently of
+	 * the guest driver. Otherwise host devices may suffer from unbounded
+	 * IRQ latencies when the guest keeps the line asserted.
 	 */
-	if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
-				 IRQF_ONESHOT, dev->irq_name, dev))
+	if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
+		irq_handler = kvm_assigned_dev_intx;
+		flags = IRQF_SHARED;
+	} else {
+		irq_handler = NULL;
+		flags = IRQF_ONESHOT;
+	}
+	if (request_threaded_irq(dev->host_irq, irq_handler,
+				 kvm_assigned_dev_thread_intx, flags,
+				 dev->irq_name, dev))
 		return -EIO;
+
+	if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
+		spin_lock_irq(&dev->intx_lock);
+		pci_intx(dev->dev, true);
+		spin_unlock_irq(&dev->intx_lock);
+	}
 	return 0;
 }
 
@@ -262,8 +373,9 @@ static int assigned_device_enable_host_msi(struct kvm *kvm,
 	}
 
 	dev->host_irq = dev->dev->irq;
-	if (request_threaded_irq(dev->host_irq, NULL, kvm_assigned_dev_thread,
-				 0, dev->irq_name, dev)) {
+	if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
+				 kvm_assigned_dev_thread_msi, 0,
+				 dev->irq_name, dev)) {
 		pci_disable_msi(dev->dev);
 		return -EIO;
 	}
@@ -283,13 +395,15 @@ static int assigned_device_enable_host_msix(struct kvm *kvm,
 	if (dev->entries_nr == 0)
 		return r;
 
-	r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
+	r = pci_enable_msix_exact(dev->dev,
+				  dev->host_msix_entries, dev->entries_nr);
 	if (r)
 		return r;
 
 	for (i = 0; i < dev->entries_nr; i++) {
 		r = request_threaded_irq(dev->host_msix_entries[i].vector,
-					 NULL, kvm_assigned_dev_thread_msix,
+					 kvm_assigned_dev_msix,
+					 kvm_assigned_dev_thread_msix,
 					 0, dev->irq_name, dev);
 		if (r)
 			goto err;
@@ -321,7 +435,6 @@ static int assigned_device_enable_guest_msi(struct kvm *kvm,
 {
 	dev->guest_irq = irq->guest_irq;
 	dev->ack_notifier.gsi = -1;
-	dev->host_irq_disabled = false;
 	return 0;
 }
 #endif
@@ -333,7 +446,6 @@ static int assigned_device_enable_guest_msix(struct kvm *kvm,
 {
 	dev->guest_irq = irq->guest_irq;
 	dev->ack_notifier.gsi = -1;
-	dev->host_irq_disabled = false;
 	return 0;
 }
 #endif
@@ -367,6 +479,7 @@ static int assign_host_irq(struct kvm *kvm,
 	default:
 		r = -EINVAL;
 	}
+	dev->host_irq_disabled = false;
 
 	if (!r)
 		dev->irq_requested_type |= host_irq_type;
@@ -468,6 +581,7 @@ static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 {
 	int r = -ENODEV;
 	struct kvm_assigned_dev_kernel *match;
+	unsigned long irq_type;
 
 	mutex_lock(&kvm->lock);
 
@@ -476,7 +590,9 @@ static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
 	if (!match)
 		goto out;
 
-	r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
+	irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
+					  KVM_DEV_IRQ_GUEST_MASK);
+	r = kvm_deassign_irq(kvm, match, irq_type);
 out:
 	mutex_unlock(&kvm->lock);
 	return r;
@@ -548,7 +664,6 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 	int r = 0, idx;
 	struct kvm_assigned_dev_kernel *match;
 	struct pci_dev *dev;
-	u8 header_type;
 
 	if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
 		return -EINVAL;
@@ -581,8 +696,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 	}
 
 	/* Don't allow bridges to be assigned */
-	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
-	if ((header_type & PCI_HEADER_TYPE) != PCI_HEADER_TYPE_NORMAL) {
+	if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
 		r = -EPERM;
 		goto out_put;
 	}
@@ -609,6 +723,10 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 	if (!match->pci_saved_state)
 		printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
 		       __func__, dev_name(&dev->dev));
+
+	if (!pci_intx_mask_supported(dev))
+		assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
+
 	match->assigned_dev_id = assigned_dev->assigned_dev_id;
 	match->host_segnr = assigned_dev->segnr;
 	match->host_busnr = assigned_dev->busnr;
@@ -616,6 +734,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 	match->flags = assigned_dev->flags;
 	match->dev = dev;
 	spin_lock_init(&match->intx_lock);
+	spin_lock_init(&match->intx_mask_lock);
 	match->irq_source_id = -1;
 	match->kvm = kvm;
 	match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
@@ -761,6 +880,55 @@ msix_entry_out:
 }
 #endif
 
+static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
+		struct kvm_assigned_pci_dev *assigned_dev)
+{
+	int r = 0;
+	struct kvm_assigned_dev_kernel *match;
+
+	mutex_lock(&kvm->lock);
+
+	match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
+				      assigned_dev->assigned_dev_id);
+	if (!match) {
+		r = -ENODEV;
+		goto out;
+	}
+
+	spin_lock(&match->intx_mask_lock);
+
+	match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
+	match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
+
+	if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
+		if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
+			kvm_set_irq(match->kvm, match->irq_source_id,
+				    match->guest_irq, 0, false);
+			/*
+			 * Masking at hardware-level is performed on demand,
+			 * i.e. when an IRQ actually arrives at the host.
+			 */
+		} else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
+			/*
+			 * Unmask the IRQ line if required. Unmasking at
+			 * device level will be performed by user space.
+			 */
+			spin_lock_irq(&match->intx_lock);
+			if (match->host_irq_disabled) {
+				enable_irq(match->host_irq);
+				match->host_irq_disabled = false;
+			}
+			spin_unlock_irq(&match->intx_lock);
+		}
+	}
+
+	spin_unlock(&match->intx_mask_lock);
+
+out:
+	mutex_unlock(&kvm->lock);
+	return r;
+}
+
 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 				  unsigned long arg)
 {
@@ -816,36 +984,6 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 			goto out;
 		break;
 	}
-#ifdef KVM_CAP_IRQ_ROUTING
-	case KVM_SET_GSI_ROUTING: {
-		struct kvm_irq_routing routing;
-		struct kvm_irq_routing __user *urouting;
-		struct kvm_irq_routing_entry *entries;
-
-		r = -EFAULT;
-		if (copy_from_user(&routing, argp, sizeof(routing)))
-			goto out;
-		r = -EINVAL;
-		if (routing.nr >= KVM_MAX_IRQ_ROUTES)
-			goto out;
-		if (routing.flags)
-			goto out;
-		r = -ENOMEM;
-		entries = vmalloc(routing.nr * sizeof(*entries));
-		if (!entries)
-			goto out;
-		r = -EFAULT;
-		urouting = argp;
-		if (copy_from_user(entries, urouting->entries,
-				   routing.nr * sizeof(*entries)))
-			goto out_free_irq_routing;
-		r = kvm_set_irq_routing(kvm, entries, routing.nr,
-					routing.flags);
-	out_free_irq_routing:
-		vfree(entries);
-		break;
-	}
-#endif /* KVM_CAP_IRQ_ROUTING */
 #ifdef __KVM_HAVE_MSIX
 	case KVM_ASSIGN_SET_MSIX_NR: {
 		struct kvm_assigned_msix_nr entry_nr;
@@ -868,6 +1006,15 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 		break;
 	}
 #endif
+	case KVM_ASSIGN_SET_INTX_MASK: {
+		struct kvm_assigned_pci_dev assigned_dev;
+
+		r = -EFAULT;
+		if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
+			goto out;
+		r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
+		break;
+	}
 	default:
 		r = -ENOTTY;
 		break;
@@ -875,4 +1022,3 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
 out:
 	return r;
 }
-
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 74268b4c2ee..d6a3d0993d8 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -28,6 +28,21 @@
 #include "async_pf.h"
 #include <trace/events/kvm.h>
 
+static inline void kvm_async_page_present_sync(struct kvm_vcpu *vcpu,
+					       struct kvm_async_pf *work)
+{
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+	kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+static inline void kvm_async_page_present_async(struct kvm_vcpu *vcpu,
+						struct kvm_async_pf *work)
+{
+#ifndef CONFIG_KVM_ASYNC_PF_SYNC
+	kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+
 static struct kmem_cache *async_pf_cache;
 
 int kvm_async_pf_init(void)
@@ -56,7 +71,6 @@ void kvm_async_pf_vcpu_init(struct kvm_vcpu *vcpu)
 
 static void async_pf_execute(struct work_struct *work)
 {
-	struct page *page = NULL;
 	struct kvm_async_pf *apf =
 		container_of(work, struct kvm_async_pf, work);
 	struct mm_struct *mm = apf->mm;
@@ -66,16 +80,13 @@ static void async_pf_execute(struct work_struct *work)
 
 	might_sleep();
 
-	use_mm(mm);
 	down_read(&mm->mmap_sem);
-	get_user_pages(current, mm, addr, 1, 1, 0, &page, NULL);
+	get_user_pages(NULL, mm, addr, 1, 1, 0, NULL, NULL);
 	up_read(&mm->mmap_sem);
-	unuse_mm(mm);
+	kvm_async_page_present_sync(vcpu, apf);
 
 	spin_lock(&vcpu->async_pf.lock);
 	list_add_tail(&apf->link, &vcpu->async_pf.done);
-	apf->page = page;
-	apf->done = true;
 	spin_unlock(&vcpu->async_pf.lock);
 
 	/*
@@ -83,12 +94,12 @@ static void async_pf_execute(struct work_struct *work)
 	 * this point
 	 */
 
-	trace_kvm_async_pf_completed(addr, page, gva);
+	trace_kvm_async_pf_completed(addr, gva);
 
 	if (waitqueue_active(&vcpu->wq))
 		wake_up_interruptible(&vcpu->wq);
 
-	mmdrop(mm);
+	mmput(mm);
 	kvm_put_kvm(vcpu->kvm);
 }
 
@@ -99,10 +110,17 @@ void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu)
 		struct kvm_async_pf *work =
 			list_entry(vcpu->async_pf.queue.next,
 				   typeof(*work), queue);
-		cancel_work_sync(&work->work);
 		list_del(&work->queue);
-		if (!work->done) /* work was canceled */
+
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+		flush_work(&work->work);
+#else
+		if (cancel_work_sync(&work->work)) {
+			mmput(work->mm);
+			kvm_put_kvm(vcpu->kvm); /* == work->vcpu->kvm */
 			kmem_cache_free(async_pf_cache, work);
+		}
+#endif
 	}
 
 	spin_lock(&vcpu->async_pf.lock);
@@ -111,8 +129,6 @@ void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu)
 			list_entry(vcpu->async_pf.done.next,
 				   typeof(*work), link);
 		list_del(&work->link);
-		if (work->page)
-			put_page(work->page);
 		kmem_cache_free(async_pf_cache, work);
 	}
 	spin_unlock(&vcpu->async_pf.lock);
@@ -132,19 +148,16 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
 		list_del(&work->link);
 		spin_unlock(&vcpu->async_pf.lock);
 
-		if (work->page)
-			kvm_arch_async_page_ready(vcpu, work);
-		kvm_arch_async_page_present(vcpu, work);
+		kvm_arch_async_page_ready(vcpu, work);
+		kvm_async_page_present_async(vcpu, work);
 
 		list_del(&work->queue);
 		vcpu->async_pf.queued--;
-		if (work->page)
-			put_page(work->page);
 		kmem_cache_free(async_pf_cache, work);
 	}
 }
 
-int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
+int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
 		       struct kvm_arch_async_pf *arch)
 {
 	struct kvm_async_pf *work;
@@ -162,14 +175,13 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 	if (!work)
 		return 0;
 
-	work->page = NULL;
-	work->done = false;
+	work->wakeup_all = false;
 	work->vcpu = vcpu;
 	work->gva = gva;
-	work->addr = gfn_to_hva(vcpu->kvm, gfn);
+	work->addr = hva;
 	work->arch = *arch;
 	work->mm = current->mm;
-	atomic_inc(&work->mm->mm_count);
+	atomic_inc(&work->mm->mm_users);
 	kvm_get_kvm(work->vcpu->kvm);
 
 	/* this can't really happen otherwise gfn_to_pfn_async
@@ -187,7 +199,7 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
 	return 1;
 retry_sync:
 	kvm_put_kvm(work->vcpu->kvm);
-	mmdrop(work->mm);
+	mmput(work->mm);
 	kmem_cache_free(async_pf_cache, work);
 	return 0;
 }
@@ -203,8 +215,7 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu)
 	if (!work)
 		return -ENOMEM;
 
-	work->page = bad_page;
-	get_page(bad_page);
+	work->wakeup_all = true;
 	INIT_LIST_HEAD(&work->queue); /* for list_del to work */
 
 	spin_lock(&vcpu->async_pf.lock);
diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 88b2fe3ddf4..00d86427af0 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -154,17 +154,13 @@ int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
 	list_add_tail(&dev->list, &kvm->coalesced_zones);
 	mutex_unlock(&kvm->slots_lock);
 
-	return ret;
+	return 0;
 
 out_free_dev:
 	mutex_unlock(&kvm->slots_lock);
-
 	kfree(dev);
 
-	if (dev == NULL)
-		return -ENXIO;
-
-	return 0;
+	return ret;
 }
 
 int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index f59c1e8de7a..20c3af7692c 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -31,10 +31,12 @@
 #include <linux/list.h>
 #include <linux/eventfd.h>
 #include <linux/kernel.h>
+#include <linux/srcu.h>
 #include <linux/slab.h>
 
 #include "iodev.h"
 
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 /*
  * --------------------------------------------------------------------
  * irqfd: Allows an fd to be used to inject an interrupt to the guest
@@ -43,6 +45,31 @@
  * --------------------------------------------------------------------
  */
 
+/*
+ * Resampling irqfds are a special variety of irqfds used to emulate
+ * level triggered interrupts.  The interrupt is asserted on eventfd
+ * trigger.  On acknowledgement through the irq ack notifier, the
+ * interrupt is de-asserted and userspace is notified through the
+ * resamplefd.  All resamplers on the same gsi are de-asserted
+ * together, so we don't need to track the state of each individual
+ * user.  We can also therefore share the same irq source ID.
+ */
+struct _irqfd_resampler {
+	struct kvm *kvm;
+	/*
+	 * List of resampling struct _irqfd objects sharing this gsi.
+	 * RCU list modified under kvm->irqfds.resampler_lock
+	 */
+	struct list_head list;
+	struct kvm_irq_ack_notifier notifier;
+	/*
+	 * Entry in list of kvm->irqfd.resampler_list.  Use for sharing
+	 * resamplers among irqfds on the same gsi.
+	 * Accessed and modified under kvm->irqfds.resampler_lock
+	 */
+	struct list_head link;
+};
+
 struct _irqfd {
 	/* Used for MSI fast-path */
 	struct kvm *kvm;
@@ -52,6 +79,12 @@ struct _irqfd {
 	/* Used for level IRQ fast-path */
 	int gsi;
 	struct work_struct inject;
+	/* The resampler used by this irqfd (resampler-only) */
+	struct _irqfd_resampler *resampler;
+	/* Eventfd notified on resample (resampler-only) */
+	struct eventfd_ctx *resamplefd;
+	/* Entry in list of irqfds for a resampler (resampler-only) */
+	struct list_head resampler_link;
 	/* Used for setup/shutdown */
 	struct eventfd_ctx *eventfd;
 	struct list_head list;
@@ -67,8 +100,63 @@ irqfd_inject(struct work_struct *work)
 	struct _irqfd *irqfd = container_of(work, struct _irqfd, inject);
 	struct kvm *kvm = irqfd->kvm;
 
-	kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1);
-	kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0);
+	if (!irqfd->resampler) {
+		kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1,
+				false);
+		kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0,
+				false);
+	} else
+		kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
+			    irqfd->gsi, 1, false);
+}
+
+/*
+ * Since resampler irqfds share an IRQ source ID, we de-assert once
+ * then notify all of the resampler irqfds using this GSI.  We can't
+ * do multiple de-asserts or we risk racing with incoming re-asserts.
+ */
+static void
+irqfd_resampler_ack(struct kvm_irq_ack_notifier *kian)
+{
+	struct _irqfd_resampler *resampler;
+	struct kvm *kvm;
+	struct _irqfd *irqfd;
+	int idx;
+
+	resampler = container_of(kian, struct _irqfd_resampler, notifier);
+	kvm = resampler->kvm;
+
+	kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
+		    resampler->notifier.gsi, 0, false);
+
+	idx = srcu_read_lock(&kvm->irq_srcu);
+
+	list_for_each_entry_rcu(irqfd, &resampler->list, resampler_link)
+		eventfd_signal(irqfd->resamplefd, 1);
+
+	srcu_read_unlock(&kvm->irq_srcu, idx);
+}
+
+static void
+irqfd_resampler_shutdown(struct _irqfd *irqfd)
+{
+	struct _irqfd_resampler *resampler = irqfd->resampler;
+	struct kvm *kvm = resampler->kvm;
+
+	mutex_lock(&kvm->irqfds.resampler_lock);
+
+	list_del_rcu(&irqfd->resampler_link);
+	synchronize_srcu(&kvm->irq_srcu);
+
+	if (list_empty(&resampler->list)) {
+		list_del(&resampler->link);
+		kvm_unregister_irq_ack_notifier(kvm, &resampler->notifier);
+		kvm_set_irq(kvm, KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
+			    resampler->notifier.gsi, 0, false);
+		kfree(resampler);
+	}
+
+	mutex_unlock(&kvm->irqfds.resampler_lock);
 }
 
 /*
@@ -90,7 +178,12 @@ irqfd_shutdown(struct work_struct *work)
 	 * We know no new events will be scheduled at this point, so block
 	 * until all previously outstanding events have completed
 	 */
-	flush_work_sync(&irqfd->inject);
+	flush_work(&irqfd->inject);
+
+	if (irqfd->resampler) {
+		irqfd_resampler_shutdown(irqfd);
+		eventfd_ctx_put(irqfd->resamplefd);
+	}
 
 	/*
 	 * It is now safe to release the object's resources
@@ -132,16 +225,18 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
 	unsigned long flags = (unsigned long)key;
 	struct kvm_kernel_irq_routing_entry *irq;
 	struct kvm *kvm = irqfd->kvm;
+	int idx;
 
 	if (flags & POLLIN) {
-		rcu_read_lock();
-		irq = rcu_dereference(irqfd->irq_entry);
+		idx = srcu_read_lock(&kvm->irq_srcu);
+		irq = srcu_dereference(irqfd->irq_entry, &kvm->irq_srcu);
 		/* An event has been signaled, inject an interrupt */
 		if (irq)
-			kvm_set_msi(irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
+			kvm_set_msi(irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1,
+					false);
 		else
 			schedule_work(&irqfd->inject);
-		rcu_read_unlock();
+		srcu_read_unlock(&kvm->irq_srcu, idx);
 	}
 
 	if (flags & POLLHUP) {
@@ -181,14 +276,13 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd,
 			 struct kvm_irq_routing_table *irq_rt)
 {
 	struct kvm_kernel_irq_routing_entry *e;
-	struct hlist_node *n;
 
 	if (irqfd->gsi >= irq_rt->nr_rt_entries) {
 		rcu_assign_pointer(irqfd->irq_entry, NULL);
 		return;
 	}
 
-	hlist_for_each_entry(e, n, &irq_rt->map[irqfd->gsi], link) {
+	hlist_for_each_entry(e, &irq_rt->map[irqfd->gsi], link) {
 		/* Only fast-path MSI. */
 		if (e->type == KVM_IRQ_ROUTING_MSI)
 			rcu_assign_pointer(irqfd->irq_entry, e);
@@ -198,12 +292,12 @@ static void irqfd_update(struct kvm *kvm, struct _irqfd *irqfd,
 }
 
 static int
-kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
+kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 {
 	struct kvm_irq_routing_table *irq_rt;
 	struct _irqfd *irqfd, *tmp;
-	struct file *file = NULL;
-	struct eventfd_ctx *eventfd = NULL;
+	struct fd f;
+	struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL;
 	int ret;
 	unsigned int events;
 
@@ -212,18 +306,18 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
 		return -ENOMEM;
 
 	irqfd->kvm = kvm;
-	irqfd->gsi = gsi;
+	irqfd->gsi = args->gsi;
 	INIT_LIST_HEAD(&irqfd->list);
 	INIT_WORK(&irqfd->inject, irqfd_inject);
 	INIT_WORK(&irqfd->shutdown, irqfd_shutdown);
 
-	file = eventfd_fget(fd);
-	if (IS_ERR(file)) {
-		ret = PTR_ERR(file);
-		goto fail;
+	f = fdget(args->fd);
+	if (!f.file) {
+		ret = -EBADF;
+		goto out;
 	}
 
-	eventfd = eventfd_ctx_fileget(file);
+	eventfd = eventfd_ctx_fileget(f.file);
 	if (IS_ERR(eventfd)) {
 		ret = PTR_ERR(eventfd);
 		goto fail;
@@ -231,6 +325,54 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
 
 	irqfd->eventfd = eventfd;
 
+	if (args->flags & KVM_IRQFD_FLAG_RESAMPLE) {
+		struct _irqfd_resampler *resampler;
+
+		resamplefd = eventfd_ctx_fdget(args->resamplefd);
+		if (IS_ERR(resamplefd)) {
+			ret = PTR_ERR(resamplefd);
+			goto fail;
+		}
+
+		irqfd->resamplefd = resamplefd;
+		INIT_LIST_HEAD(&irqfd->resampler_link);
+
+		mutex_lock(&kvm->irqfds.resampler_lock);
+
+		list_for_each_entry(resampler,
+				    &kvm->irqfds.resampler_list, link) {
+			if (resampler->notifier.gsi == irqfd->gsi) {
+				irqfd->resampler = resampler;
+				break;
+			}
+		}
+
+		if (!irqfd->resampler) {
+			resampler = kzalloc(sizeof(*resampler), GFP_KERNEL);
+			if (!resampler) {
+				ret = -ENOMEM;
+				mutex_unlock(&kvm->irqfds.resampler_lock);
+				goto fail;
+			}
+
+			resampler->kvm = kvm;
+			INIT_LIST_HEAD(&resampler->list);
+			resampler->notifier.gsi = irqfd->gsi;
+			resampler->notifier.irq_acked = irqfd_resampler_ack;
+			INIT_LIST_HEAD(&resampler->link);
+
+			list_add(&resampler->link, &kvm->irqfds.resampler_list);
+			kvm_register_irq_ack_notifier(kvm,
+						      &resampler->notifier);
+			irqfd->resampler = resampler;
+		}
+
+		list_add_rcu(&irqfd->resampler_link, &irqfd->resampler->list);
+		synchronize_srcu(&kvm->irq_srcu);
+
+		mutex_unlock(&kvm->irqfds.resampler_lock);
+	}
+
 	/*
 	 * Install our own custom wake-up handling so we are notified via
 	 * a callback whenever someone signals the underlying eventfd
@@ -254,69 +396,81 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
 					   lockdep_is_held(&kvm->irqfds.lock));
 	irqfd_update(kvm, irqfd, irq_rt);
 
-	events = file->f_op->poll(file, &irqfd->pt);
-
 	list_add_tail(&irqfd->list, &kvm->irqfds.items);
 
+	spin_unlock_irq(&kvm->irqfds.lock);
+
 	/*
 	 * Check if there was an event already pending on the eventfd
 	 * before we registered, and trigger it as if we didn't miss it.
 	 */
+	events = f.file->f_op->poll(f.file, &irqfd->pt);
+
 	if (events & POLLIN)
 		schedule_work(&irqfd->inject);
 
-	spin_unlock_irq(&kvm->irqfds.lock);
-
 	/*
 	 * do not drop the file until the irqfd is fully initialized, otherwise
 	 * we might race against the POLLHUP
 	 */
-	fput(file);
+	fdput(f);
 
 	return 0;
 
 fail:
+	if (irqfd->resampler)
+		irqfd_resampler_shutdown(irqfd);
+
+	if (resamplefd && !IS_ERR(resamplefd))
+		eventfd_ctx_put(resamplefd);
+
 	if (eventfd && !IS_ERR(eventfd))
 		eventfd_ctx_put(eventfd);
 
-	if (!IS_ERR(file))
-		fput(file);
+	fdput(f);
 
+out:
 	kfree(irqfd);
 	return ret;
 }
+#endif
 
 void
 kvm_eventfd_init(struct kvm *kvm)
 {
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 	spin_lock_init(&kvm->irqfds.lock);
 	INIT_LIST_HEAD(&kvm->irqfds.items);
+	INIT_LIST_HEAD(&kvm->irqfds.resampler_list);
+	mutex_init(&kvm->irqfds.resampler_lock);
+#endif
 	INIT_LIST_HEAD(&kvm->ioeventfds);
 }
 
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 /*
  * shutdown any irqfd's that match fd+gsi
  */
 static int
-kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
+kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
 {
 	struct _irqfd *irqfd, *tmp;
 	struct eventfd_ctx *eventfd;
 
-	eventfd = eventfd_ctx_fdget(fd);
+	eventfd = eventfd_ctx_fdget(args->fd);
 	if (IS_ERR(eventfd))
 		return PTR_ERR(eventfd);
 
 	spin_lock_irq(&kvm->irqfds.lock);
 
 	list_for_each_entry_safe(irqfd, tmp, &kvm->irqfds.items, list) {
-		if (irqfd->eventfd == eventfd && irqfd->gsi == gsi) {
+		if (irqfd->eventfd == eventfd && irqfd->gsi == args->gsi) {
 			/*
 			 * This rcu_assign_pointer is needed for when
 			 * another thread calls kvm_irq_routing_update before
 			 * we flush workqueue below (we synchronize with
 			 * kvm_irq_routing_update using irqfds.lock).
-			 * It is paired with synchronize_rcu done by caller
+			 * It is paired with synchronize_srcu done by caller
 			 * of that function.
 			 */
 			rcu_assign_pointer(irqfd->irq_entry, NULL);
@@ -338,12 +492,15 @@ kvm_irqfd_deassign(struct kvm *kvm, int fd, int gsi)
 }
 
 int
-kvm_irqfd(struct kvm *kvm, int fd, int gsi, int flags)
+kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 {
-	if (flags & KVM_IRQFD_FLAG_DEASSIGN)
-		return kvm_irqfd_deassign(kvm, fd, gsi);
+	if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | KVM_IRQFD_FLAG_RESAMPLE))
+		return -EINVAL;
 
-	return kvm_irqfd_assign(kvm, fd, gsi);
+	if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
+		return kvm_irqfd_deassign(kvm, args);
+
+	return kvm_irqfd_assign(kvm, args);
 }
 
 /*
@@ -372,7 +529,7 @@ kvm_irqfd_release(struct kvm *kvm)
 
 /*
  * Change irq_routing and irqfd.
- * Caller must invoke synchronize_rcu afterwards.
+ * Caller must invoke synchronize_srcu(&kvm->irq_srcu) afterwards.
  */
 void kvm_irq_routing_update(struct kvm *kvm,
 			    struct kvm_irq_routing_table *irq_rt)
@@ -394,7 +551,7 @@ void kvm_irq_routing_update(struct kvm *kvm,
  * aggregated from all vm* instances. We need our own isolated single-thread
  * queue to prevent deadlock against flushing the normal work-queue.
  */
-static int __init irqfd_module_init(void)
+int kvm_irqfd_init(void)
 {
 	irqfd_cleanup_wq = create_singlethread_workqueue("kvm-irqfd-cleanup");
 	if (!irqfd_cleanup_wq)
@@ -403,13 +560,11 @@ static int __init irqfd_module_init(void)
 	return 0;
 }
 
-static void __exit irqfd_module_exit(void)
+void kvm_irqfd_exit(void)
 {
 	destroy_workqueue(irqfd_cleanup_wq);
 }
-
-module_init(irqfd_module_init);
-module_exit(irqfd_module_exit);
+#endif
 
 /*
  * --------------------------------------------------------------------
@@ -427,6 +582,7 @@ struct _ioeventfd {
 	struct eventfd_ctx  *eventfd;
 	u64                  datamatch;
 	struct kvm_io_device dev;
+	u8                   bus_idx;
 	bool                 wildcard;
 };
 
@@ -449,7 +605,15 @@ ioeventfd_in_range(struct _ioeventfd *p, gpa_t addr, int len, const void *val)
 {
 	u64 _val;
 
-	if (!(addr == p->addr && len == p->length))
+	if (addr != p->addr)
+		/* address must be precise for a hit */
+		return false;
+
+	if (!p->length)
+		/* length = 0 means only look at the address, so always a hit */
+		return true;
+
+	if (len != p->length)
 		/* address-range must be precise for a hit */
 		return false;
 
@@ -519,25 +683,38 @@ ioeventfd_check_collision(struct kvm *kvm, struct _ioeventfd *p)
 	struct _ioeventfd *_p;
 
 	list_for_each_entry(_p, &kvm->ioeventfds, list)
-		if (_p->addr == p->addr && _p->length == p->length &&
-		    (_p->wildcard || p->wildcard ||
-		     _p->datamatch == p->datamatch))
+		if (_p->bus_idx == p->bus_idx &&
+		    _p->addr == p->addr &&
+		    (!_p->length || !p->length ||
+		     (_p->length == p->length &&
+		      (_p->wildcard || p->wildcard ||
+		       _p->datamatch == p->datamatch))))
 			return true;
 
 	return false;
 }
 
+static enum kvm_bus ioeventfd_bus_from_flags(__u32 flags)
+{
+	if (flags & KVM_IOEVENTFD_FLAG_PIO)
+		return KVM_PIO_BUS;
+	if (flags & KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY)
+		return KVM_VIRTIO_CCW_NOTIFY_BUS;
+	return KVM_MMIO_BUS;
+}
+
 static int
 kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 {
-	int                       pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
-	enum kvm_bus              bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
+	enum kvm_bus              bus_idx;
 	struct _ioeventfd        *p;
 	struct eventfd_ctx       *eventfd;
 	int                       ret;
 
-	/* must be natural-word sized */
+	bus_idx = ioeventfd_bus_from_flags(args->flags);
+	/* must be natural-word sized, or 0 to ignore length */
 	switch (args->len) {
+	case 0:
 	case 1:
 	case 2:
 	case 4:
@@ -555,6 +732,12 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 	if (args->flags & ~KVM_IOEVENTFD_VALID_FLAG_MASK)
 		return -EINVAL;
 
+	/* ioeventfd with no length can't be combined with DATAMATCH */
+	if (!args->len &&
+	    args->flags & (KVM_IOEVENTFD_FLAG_PIO |
+			   KVM_IOEVENTFD_FLAG_DATAMATCH))
+		return -EINVAL;
+
 	eventfd = eventfd_ctx_fdget(args->fd);
 	if (IS_ERR(eventfd))
 		return PTR_ERR(eventfd);
@@ -567,6 +750,7 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 
 	INIT_LIST_HEAD(&p->list);
 	p->addr    = args->addr;
+	p->bus_idx = bus_idx;
 	p->length  = args->len;
 	p->eventfd = eventfd;
 
@@ -591,12 +775,25 @@ kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 	if (ret < 0)
 		goto unlock_fail;
 
+	/* When length is ignored, MMIO is also put on a separate bus, for
+	 * faster lookups.
+	 */
+	if (!args->len && !(args->flags & KVM_IOEVENTFD_FLAG_PIO)) {
+		ret = kvm_io_bus_register_dev(kvm, KVM_FAST_MMIO_BUS,
+					      p->addr, 0, &p->dev);
+		if (ret < 0)
+			goto register_fail;
+	}
+
+	kvm->buses[bus_idx]->ioeventfd_count++;
 	list_add_tail(&p->list, &kvm->ioeventfds);
 
 	mutex_unlock(&kvm->slots_lock);
 
 	return 0;
 
+register_fail:
+	kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
 unlock_fail:
 	mutex_unlock(&kvm->slots_lock);
 
@@ -610,12 +807,12 @@ fail:
 static int
 kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 {
-	int                       pio = args->flags & KVM_IOEVENTFD_FLAG_PIO;
-	enum kvm_bus              bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS;
+	enum kvm_bus              bus_idx;
 	struct _ioeventfd        *p, *tmp;
 	struct eventfd_ctx       *eventfd;
 	int                       ret = -ENOENT;
 
+	bus_idx = ioeventfd_bus_from_flags(args->flags);
 	eventfd = eventfd_ctx_fdget(args->fd);
 	if (IS_ERR(eventfd))
 		return PTR_ERR(eventfd);
@@ -625,7 +822,8 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 	list_for_each_entry_safe(p, tmp, &kvm->ioeventfds, list) {
 		bool wildcard = !(args->flags & KVM_IOEVENTFD_FLAG_DATAMATCH);
 
-		if (p->eventfd != eventfd  ||
+		if (p->bus_idx != bus_idx ||
+		    p->eventfd != eventfd  ||
 		    p->addr != args->addr  ||
 		    p->length != args->len ||
 		    p->wildcard != wildcard)
@@ -635,6 +833,11 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
 			continue;
 
 		kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
+		if (!p->length) {
+			kvm_io_bus_unregister_dev(kvm, KVM_FAST_MMIO_BUS,
+						  &p->dev);
+		}
+		kvm->buses[bus_idx]->ioeventfd_count--;
 		ioeventfd_release(p);
 		ret = 0;
 		break;
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index dcaf272c26c..2458a1dc2ba 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -35,6 +35,7 @@
 #include <linux/hrtimer.h>
 #include <linux/io.h>
 #include <linux/slab.h>
+#include <linux/export.h>
 #include <asm/processor.h>
 #include <asm/page.h>
 #include <asm/current.h>
@@ -49,7 +50,8 @@
 #else
 #define ioapic_debug(fmt, arg...)
 #endif
-static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq);
+static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
+		bool line_status);
 
 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 					  unsigned long addr,
@@ -73,9 +75,12 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 			u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
 			u64 redir_content;
 
-			ASSERT(redir_index < IOAPIC_NUM_PINS);
+			if (redir_index < IOAPIC_NUM_PINS)
+				redir_content =
+					ioapic->redirtbl[redir_index].bits;
+			else
+				redir_content = ~0ULL;
 
-			redir_content = ioapic->redirtbl[redir_index].bits;
 			result = (ioapic->ioregsel & 0x1) ?
 			    (redir_content >> 32) & 0xffffffff :
 			    redir_content & 0xffffffff;
@@ -86,22 +91,146 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 	return result;
 }
 
-static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
+static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
+{
+	ioapic->rtc_status.pending_eoi = 0;
+	bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS);
+}
+
+static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
+
+static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic)
+{
+	if (WARN_ON(ioapic->rtc_status.pending_eoi < 0))
+		kvm_rtc_eoi_tracking_restore_all(ioapic);
+}
+
+static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
+{
+	bool new_val, old_val;
+	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
+	union kvm_ioapic_redirect_entry *e;
+
+	e = &ioapic->redirtbl[RTC_GSI];
+	if (!kvm_apic_match_dest(vcpu, NULL, 0,	e->fields.dest_id,
+				e->fields.dest_mode))
+		return;
+
+	new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
+	old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
+
+	if (new_val == old_val)
+		return;
+
+	if (new_val) {
+		__set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
+		ioapic->rtc_status.pending_eoi++;
+	} else {
+		__clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
+		ioapic->rtc_status.pending_eoi--;
+		rtc_status_pending_eoi_check_valid(ioapic);
+	}
+}
+
+void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
+{
+	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
+
+	spin_lock(&ioapic->lock);
+	__rtc_irq_eoi_tracking_restore_one(vcpu);
+	spin_unlock(&ioapic->lock);
+}
+
+static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
+{
+	struct kvm_vcpu *vcpu;
+	int i;
+
+	if (RTC_GSI >= IOAPIC_NUM_PINS)
+		return;
+
+	rtc_irq_eoi_tracking_reset(ioapic);
+	kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
+	    __rtc_irq_eoi_tracking_restore_one(vcpu);
+}
+
+static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu)
+{
+	if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) {
+		--ioapic->rtc_status.pending_eoi;
+		rtc_status_pending_eoi_check_valid(ioapic);
+	}
+}
+
+static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)
 {
-	union kvm_ioapic_redirect_entry *pent;
-	int injected = -1;
+	if (ioapic->rtc_status.pending_eoi > 0)
+		return true; /* coalesced */
+
+	return false;
+}
+
+static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq,
+		int irq_level, bool line_status)
+{
+	union kvm_ioapic_redirect_entry entry;
+	u32 mask = 1 << irq;
+	u32 old_irr;
+	int edge, ret;
+
+	entry = ioapic->redirtbl[irq];
+	edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
 
-	pent = &ioapic->redirtbl[idx];
+	if (!irq_level) {
+		ioapic->irr &= ~mask;
+		ret = 1;
+		goto out;
+	}
 
-	if (!pent->fields.mask) {
-		injected = ioapic_deliver(ioapic, idx);
-		if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
-			pent->fields.remote_irr = 1;
+	/*
+	 * Return 0 for coalesced interrupts; for edge-triggered interrupts,
+	 * this only happens if a previous edge has not been delivered due
+	 * do masking.  For level interrupts, the remote_irr field tells
+	 * us if the interrupt is waiting for an EOI.
+	 *
+	 * RTC is special: it is edge-triggered, but userspace likes to know
+	 * if it has been already ack-ed via EOI because coalesced RTC
+	 * interrupts lead to time drift in Windows guests.  So we track
+	 * EOI manually for the RTC interrupt.
+	 */
+	if (irq == RTC_GSI && line_status &&
+		rtc_irq_check_coalesced(ioapic)) {
+		ret = 0;
+		goto out;
 	}
 
-	return injected;
+	old_irr = ioapic->irr;
+	ioapic->irr |= mask;
+	if ((edge && old_irr == ioapic->irr) ||
+	    (!edge && entry.fields.remote_irr)) {
+		ret = 0;
+		goto out;
+	}
+
+	ret = ioapic_service(ioapic, irq, line_status);
+
+out:
+	trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
+	return ret;
 }
 
+static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)
+{
+	u32 idx;
+
+	rtc_irq_eoi_tracking_reset(ioapic);
+	for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS)
+		ioapic_set_irq(ioapic, idx, 1, true);
+
+	kvm_rtc_eoi_tracking_restore_all(ioapic);
+}
+
+
 static void update_handled_vectors(struct kvm_ioapic *ioapic)
 {
 	DECLARE_BITMAP(handled_vectors, 256);
@@ -115,6 +244,49 @@ static void update_handled_vectors(struct kvm_ioapic *ioapic)
 	smp_wmb();
 }
 
+void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap,
+			u32 *tmr)
+{
+	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
+	union kvm_ioapic_redirect_entry *e;
+	int index;
+
+	spin_lock(&ioapic->lock);
+	for (index = 0; index < IOAPIC_NUM_PINS; index++) {
+		e = &ioapic->redirtbl[index];
+		if (!e->fields.mask &&
+			(e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
+			 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
+				 index) || index == RTC_GSI)) {
+			if (kvm_apic_match_dest(vcpu, NULL, 0,
+				e->fields.dest_id, e->fields.dest_mode)) {
+				__set_bit(e->fields.vector,
+					(unsigned long *)eoi_exit_bitmap);
+				if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG)
+					__set_bit(e->fields.vector,
+						(unsigned long *)tmr);
+			}
+		}
+	}
+	spin_unlock(&ioapic->lock);
+}
+
+#ifdef CONFIG_X86
+void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
+{
+	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+
+	if (!ioapic)
+		return;
+	kvm_make_scan_ioapic_request(kvm);
+}
+#else
+void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
+{
+	return;
+}
+#endif
+
 static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 {
 	unsigned index;
@@ -155,15 +327,20 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 			kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
 		if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
 		    && ioapic->irr & (1 << index))
-			ioapic_service(ioapic, index);
+			ioapic_service(ioapic, index, false);
+		kvm_vcpu_request_scan_ioapic(ioapic->kvm);
 		break;
 	}
 }
 
-static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
+static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
 {
 	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
 	struct kvm_lapic_irq irqe;
+	int ret;
+
+	if (entry->fields.mask)
+		return -1;
 
 	ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 		     "vector=%x trig_mode=%x\n",
@@ -179,50 +356,58 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 	irqe.level = 1;
 	irqe.shorthand = 0;
 
-#ifdef CONFIG_X86
-	/* Always delivery PIT interrupt to vcpu 0 */
-	if (irq == 0) {
-		irqe.dest_mode = 0; /* Physical mode. */
-		/* need to read apic_id from apic regiest since
-		 * it can be rewritten */
-		irqe.dest_id = ioapic->kvm->bsp_vcpu_id;
-	}
-#endif
-	return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
+	if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
+		ioapic->irr &= ~(1 << irq);
+
+	if (irq == RTC_GSI && line_status) {
+		/*
+		 * pending_eoi cannot ever become negative (see
+		 * rtc_status_pending_eoi_check_valid) and the caller
+		 * ensures that it is only called if it is >= zero, namely
+		 * if rtc_irq_check_coalesced returns false).
+		 */
+		BUG_ON(ioapic->rtc_status.pending_eoi != 0);
+		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
+				ioapic->rtc_status.dest_map);
+		ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
+	} else
+		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
+
+	if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
+		entry->fields.remote_irr = 1;
+
+	return ret;
 }
 
-int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
+int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
+		       int level, bool line_status)
 {
-	u32 old_irr;
-	u32 mask = 1 << irq;
-	union kvm_ioapic_redirect_entry entry;
-	int ret = 1;
+	int ret, irq_level;
+
+	BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
 
 	spin_lock(&ioapic->lock);
-	old_irr = ioapic->irr;
-	if (irq >= 0 && irq < IOAPIC_NUM_PINS) {
-		entry = ioapic->redirtbl[irq];
-		level ^= entry.fields.polarity;
-		if (!level)
-			ioapic->irr &= ~mask;
-		else {
-			int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
-			ioapic->irr |= mask;
-			if ((edge && old_irr != ioapic->irr) ||
-			    (!edge && !entry.fields.remote_irr))
-				ret = ioapic_service(ioapic, irq);
-			else
-				ret = 0; /* report coalesced interrupt */
-		}
-		trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
-	}
+	irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
+					 irq_source_id, level);
+	ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);
+
 	spin_unlock(&ioapic->lock);
 
 	return ret;
 }
 
-static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector,
-				     int trigger_mode)
+void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
+{
+	int i;
+
+	spin_lock(&ioapic->lock);
+	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
+		__clear_bit(irq_source_id, &ioapic->irq_states[i]);
+	spin_unlock(&ioapic->lock);
+}
+
+static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
+			struct kvm_ioapic *ioapic, int vector, int trigger_mode)
 {
 	int i;
 
@@ -232,6 +417,8 @@ static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector,
 		if (ent->fields.vector != vector)
 			continue;
 
+		if (i == RTC_GSI)
+			rtc_irq_eoi(ioapic, vcpu);
 		/*
 		 * We are dropping lock while calling ack notifiers because ack
 		 * notifier callbacks for assigned devices call into IOAPIC
@@ -249,20 +436,24 @@ static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector,
 
 		ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 		ent->fields.remote_irr = 0;
-		if (!ent->fields.mask && (ioapic->irr & (1 << i)))
-			ioapic_service(ioapic, i);
+		if (ioapic->irr & (1 << i))
+			ioapic_service(ioapic, i, false);
 	}
 }
 
-void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode)
+bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
 {
 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
-
 	smp_rmb();
-	if (!test_bit(vector, ioapic->handled_vectors))
-		return;
+	return test_bit(vector, ioapic->handled_vectors);
+}
+
+void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
+{
+	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
+
 	spin_lock(&ioapic->lock);
-	__kvm_ioapic_update_eoi(ioapic, vector, trigger_mode);
+	__kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
 	spin_unlock(&ioapic->lock);
 }
 
@@ -360,7 +551,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
 		break;
 #ifdef	CONFIG_IA64
 	case IOAPIC_REG_EOI:
-		__kvm_ioapic_update_eoi(ioapic, data, IOAPIC_LEVEL_TRIG);
+		__kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
 		break;
 #endif
 
@@ -371,7 +562,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
 	return 0;
 }
 
-void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
+static void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 {
 	int i;
 
@@ -381,6 +572,7 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
 	ioapic->ioregsel = 0;
 	ioapic->irr = 0;
 	ioapic->id = 0;
+	rtc_irq_eoi_tracking_reset(ioapic);
 	update_handled_vectors(ioapic);
 }
 
@@ -445,7 +637,10 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
 
 	spin_lock(&ioapic->lock);
 	memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
+	ioapic->irr = 0;
 	update_handled_vectors(ioapic);
+	kvm_vcpu_request_scan_ioapic(kvm);
+	kvm_ioapic_inject_all(ioapic, state->irr);
 	spin_unlock(&ioapic->lock);
 	return 0;
 }
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index 0b190c34ccc..90d43e95dcf 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -34,6 +34,17 @@ struct kvm_vcpu;
 #define	IOAPIC_INIT			0x5
 #define	IOAPIC_EXTINT			0x7
 
+#ifdef CONFIG_X86
+#define RTC_GSI 8
+#else
+#define RTC_GSI -1U
+#endif
+
+struct rtc_status {
+	int pending_eoi;
+	DECLARE_BITMAP(dest_map, KVM_MAX_VCPUS);
+};
+
 struct kvm_ioapic {
 	u64 base_address;
 	u32 ioregsel;
@@ -47,6 +58,7 @@ struct kvm_ioapic {
 	void (*ack_notifier)(void *opaque, int irq);
 	spinlock_t lock;
 	DECLARE_BITMAP(handled_vectors, 256);
+	struct rtc_status rtc_status;
 };
 
 #ifdef DEBUG
@@ -67,17 +79,24 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
 	return kvm->arch.vioapic;
 }
 
+void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
 int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
 		int short_hand, int dest, int dest_mode);
 int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
-void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
+void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector,
+			int trigger_mode);
+bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector);
 int kvm_ioapic_init(struct kvm *kvm);
 void kvm_ioapic_destroy(struct kvm *kvm);
-int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
-void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
+int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
+		       int level, bool line_status);
+void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id);
 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
-		struct kvm_lapic_irq *irq);
+		struct kvm_lapic_irq *irq, unsigned long *dest_map);
 int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
 int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
+void kvm_vcpu_request_scan_ioapic(struct kvm *kvm);
+void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap,
+			u32 *tmr);
 
 #endif
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index a457d2138f4..0df7d4b34df 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -42,21 +42,21 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm);
 static void kvm_iommu_put_pages(struct kvm *kvm,
 				gfn_t base_gfn, unsigned long npages);
 
-static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
-			   gfn_t gfn, unsigned long size)
+static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
+			   unsigned long size)
 {
 	gfn_t end_gfn;
 	pfn_t pfn;
 
-	pfn     = gfn_to_pfn_memslot(kvm, slot, gfn);
+	pfn     = gfn_to_pfn_memslot(slot, gfn);
 	end_gfn = gfn + (size >> PAGE_SHIFT);
 	gfn    += 1;
 
-	if (is_error_pfn(pfn))
+	if (is_error_noslot_pfn(pfn))
 		return pfn;
 
 	while (gfn < end_gfn)
-		gfn_to_pfn_memslot(kvm, slot, gfn++);
+		gfn_to_pfn_memslot(slot, gfn++);
 
 	return pfn;
 }
@@ -76,8 +76,10 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
 	gfn     = slot->base_gfn;
 	end_gfn = gfn + slot->npages;
 
-	flags = IOMMU_READ | IOMMU_WRITE;
-	if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
+	flags = IOMMU_READ;
+	if (!(slot->flags & KVM_MEM_READONLY))
+		flags |= IOMMU_WRITE;
+	if (!kvm->arch.iommu_noncoherent)
 		flags |= IOMMU_CACHE;
 
 
@@ -101,12 +103,16 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
 		while ((gfn << PAGE_SHIFT) & (page_size - 1))
 			page_size >>= 1;
 
+		/* Make sure hva is aligned to the page size we want to map */
+		while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
+			page_size >>= 1;
+
 		/*
 		 * Pin all pages we are about to map in memory. This is
 		 * important because we unmap and unpin in 4kb steps later.
 		 */
-		pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
-		if (is_error_pfn(pfn)) {
+		pfn = kvm_pin_pages(slot, gfn, page_size);
+		if (is_error_noslot_pfn(pfn)) {
 			gfn += 1;
 			continue;
 		}
@@ -138,6 +144,9 @@ static int kvm_iommu_map_memslots(struct kvm *kvm)
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;
 
+	if (kvm->arch.iommu_noncoherent)
+		kvm_arch_register_noncoherent_dma(kvm);
+
 	idx = srcu_read_lock(&kvm->srcu);
 	slots = kvm_memslots(kvm);
 
@@ -156,7 +165,8 @@ int kvm_assign_device(struct kvm *kvm,
 {
 	struct pci_dev *pdev = NULL;
 	struct iommu_domain *domain = kvm->arch.iommu_domain;
-	int r, last_flags;
+	int r;
+	bool noncoherent;
 
 	/* check if iommu exists and in use */
 	if (!domain)
@@ -168,23 +178,17 @@ int kvm_assign_device(struct kvm *kvm,
 
 	r = iommu_attach_device(domain, &pdev->dev);
 	if (r) {
-		printk(KERN_ERR "assign device %x:%x:%x.%x failed",
-			pci_domain_nr(pdev->bus),
-			pdev->bus->number,
-			PCI_SLOT(pdev->devfn),
-			PCI_FUNC(pdev->devfn));
+		dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
 		return r;
 	}
 
-	last_flags = kvm->arch.iommu_flags;
-	if (iommu_domain_has_cap(kvm->arch.iommu_domain,
-				 IOMMU_CAP_CACHE_COHERENCY))
-		kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
+	noncoherent = !iommu_domain_has_cap(kvm->arch.iommu_domain,
+					    IOMMU_CAP_CACHE_COHERENCY);
 
 	/* Check if need to update IOMMU page table for guest memory */
-	if ((last_flags ^ kvm->arch.iommu_flags) ==
-			KVM_IOMMU_CACHE_COHERENCY) {
+	if (noncoherent != kvm->arch.iommu_noncoherent) {
 		kvm_iommu_unmap_memslots(kvm);
+		kvm->arch.iommu_noncoherent = noncoherent;
 		r = kvm_iommu_map_memslots(kvm);
 		if (r)
 			goto out_unmap;
@@ -192,11 +196,7 @@ int kvm_assign_device(struct kvm *kvm,
 
 	pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
 
-	printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
-		assigned_dev->host_segnr,
-		assigned_dev->host_busnr,
-		PCI_SLOT(assigned_dev->host_devfn),
-		PCI_FUNC(assigned_dev->host_devfn));
+	dev_info(&pdev->dev, "kvm assign device\n");
 
 	return 0;
 out_unmap:
@@ -222,11 +222,7 @@ int kvm_deassign_device(struct kvm *kvm,
 
 	pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
 
-	printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
-		assigned_dev->host_segnr,
-		assigned_dev->host_busnr,
-		PCI_SLOT(assigned_dev->host_devfn),
-		PCI_FUNC(assigned_dev->host_devfn));
+	dev_info(&pdev->dev, "kvm deassign device\n");
 
 	return 0;
 }
@@ -240,9 +236,13 @@ int kvm_iommu_map_guest(struct kvm *kvm)
 		return -ENODEV;
 	}
 
+	mutex_lock(&kvm->slots_lock);
+
 	kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
-	if (!kvm->arch.iommu_domain)
-		return -ENOMEM;
+	if (!kvm->arch.iommu_domain) {
+		r = -ENOMEM;
+		goto out_unlock;
+	}
 
 	if (!allow_unsafe_assigned_interrupts &&
 	    !iommu_domain_has_cap(kvm->arch.iommu_domain,
@@ -253,17 +253,16 @@ int kvm_iommu_map_guest(struct kvm *kvm)
 		       " module option.\n", __func__);
 		iommu_domain_free(kvm->arch.iommu_domain);
 		kvm->arch.iommu_domain = NULL;
-		return -EPERM;
+		r = -EPERM;
+		goto out_unlock;
 	}
 
 	r = kvm_iommu_map_memslots(kvm);
 	if (r)
-		goto out_unmap;
-
-	return 0;
+		kvm_iommu_unmap_memslots(kvm);
 
-out_unmap:
-	kvm_iommu_unmap_memslots(kvm);
+out_unlock:
+	mutex_unlock(&kvm->slots_lock);
 	return r;
 }
 
@@ -297,6 +296,12 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
 
 		/* Get physical address */
 		phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
+
+		if (!phys) {
+			gfn++;
+			continue;
+		}
+
 		pfn  = phys >> PAGE_SHIFT;
 
 		/* Unmap address from IO address space */
@@ -310,6 +315,11 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
 	}
 }
 
+void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
+{
+	kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
+}
+
 static int kvm_iommu_unmap_memslots(struct kvm *kvm)
 {
 	int idx;
@@ -320,10 +330,13 @@ static int kvm_iommu_unmap_memslots(struct kvm *kvm)
 	slots = kvm_memslots(kvm);
 
 	kvm_for_each_memslot(memslot, slots)
-		kvm_iommu_put_pages(kvm, memslot->base_gfn, memslot->npages);
+		kvm_iommu_unmap_pages(kvm, memslot);
 
 	srcu_read_unlock(&kvm->srcu, idx);
 
+	if (kvm->arch.iommu_noncoherent)
+		kvm_arch_unregister_noncoherent_dma(kvm);
+
 	return 0;
 }
 
@@ -335,7 +348,12 @@ int kvm_iommu_unmap_guest(struct kvm *kvm)
 	if (!domain)
 		return 0;
 
+	mutex_lock(&kvm->slots_lock);
 	kvm_iommu_unmap_memslots(kvm);
+	kvm->arch.iommu_domain = NULL;
+	kvm->arch.iommu_noncoherent = false;
+	mutex_unlock(&kvm->slots_lock);
+
 	iommu_domain_free(domain);
 	return 0;
 }
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 9f614b4e365..ced4a542a03 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -22,6 +22,7 @@
 
 #include <linux/kvm_host.h>
 #include <linux/slab.h>
+#include <linux/export.h>
 #include <trace/events/kvm.h>
 
 #include <asm/msidef.h>
@@ -33,39 +34,25 @@
 
 #include "ioapic.h"
 
-static inline int kvm_irq_line_state(unsigned long *irq_state,
-				     int irq_source_id, int level)
-{
-	/* Logical OR for level trig interrupt */
-	if (level)
-		set_bit(irq_source_id, irq_state);
-	else
-		clear_bit(irq_source_id, irq_state);
-
-	return !!(*irq_state);
-}
-
 static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
-			   struct kvm *kvm, int irq_source_id, int level)
+			   struct kvm *kvm, int irq_source_id, int level,
+			   bool line_status)
 {
 #ifdef CONFIG_X86
 	struct kvm_pic *pic = pic_irqchip(kvm);
-	level = kvm_irq_line_state(&pic->irq_states[e->irqchip.pin],
-				   irq_source_id, level);
-	return kvm_pic_set_irq(pic, e->irqchip.pin, level);
+	return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
 #else
 	return -1;
 #endif
 }
 
 static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
-			      struct kvm *kvm, int irq_source_id, int level)
+			      struct kvm *kvm, int irq_source_id, int level,
+			      bool line_status)
 {
 	struct kvm_ioapic *ioapic = kvm->arch.vioapic;
-	level = kvm_irq_line_state(&ioapic->irq_states[e->irqchip.pin],
-				   irq_source_id, level);
-
-	return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, level);
+	return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
+				line_status);
 }
 
 inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
@@ -79,14 +66,19 @@ inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq)
 }
 
 int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
-		struct kvm_lapic_irq *irq)
+		struct kvm_lapic_irq *irq, unsigned long *dest_map)
 {
 	int i, r = -1;
 	struct kvm_vcpu *vcpu, *lowest = NULL;
 
 	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
-			kvm_is_dm_lowest_prio(irq))
+			kvm_is_dm_lowest_prio(irq)) {
 		printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
+		irq->delivery_mode = APIC_DM_FIXED;
+	}
+
+	if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r, dest_map))
+		return r;
 
 	kvm_for_each_vcpu(i, vcpu, kvm) {
 		if (!kvm_apic_present(vcpu))
@@ -99,7 +91,7 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 		if (!kvm_is_dm_lowest_prio(irq)) {
 			if (r < 0)
 				r = 0;
-			r += kvm_apic_set_irq(vcpu, irq);
+			r += kvm_apic_set_irq(vcpu, irq, dest_map);
 		} else if (kvm_lapic_enabled(vcpu)) {
 			if (!lowest)
 				lowest = vcpu;
@@ -109,108 +101,94 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 	}
 
 	if (lowest)
-		r = kvm_apic_set_irq(lowest, irq);
+		r = kvm_apic_set_irq(lowest, irq, dest_map);
 
 	return r;
 }
 
+static inline void kvm_set_msi_irq(struct kvm_kernel_irq_routing_entry *e,
+				   struct kvm_lapic_irq *irq)
+{
+	trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
+
+	irq->dest_id = (e->msi.address_lo &
+			MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
+	irq->vector = (e->msi.data &
+			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
+	irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
+	irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
+	irq->delivery_mode = e->msi.data & 0x700;
+	irq->level = 1;
+	irq->shorthand = 0;
+	/* TODO Deal with RH bit of MSI message address */
+}
+
 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
-		struct kvm *kvm, int irq_source_id, int level)
+		struct kvm *kvm, int irq_source_id, int level, bool line_status)
 {
 	struct kvm_lapic_irq irq;
 
 	if (!level)
 		return -1;
 
-	trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data);
+	kvm_set_msi_irq(e, &irq);
 
-	irq.dest_id = (e->msi.address_lo &
-			MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
-	irq.vector = (e->msi.data &
-			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
-	irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
-	irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
-	irq.delivery_mode = e->msi.data & 0x700;
-	irq.level = 1;
-	irq.shorthand = 0;
+	return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
+}
 
-	/* TODO Deal with RH bit of MSI message address */
-	return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
+
+static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
+			 struct kvm *kvm)
+{
+	struct kvm_lapic_irq irq;
+	int r;
+
+	kvm_set_msi_irq(e, &irq);
+
+	if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
+		return r;
+	else
+		return -EWOULDBLOCK;
 }
 
 /*
+ * Deliver an IRQ in an atomic context if we can, or return a failure,
+ * user can retry in a process context.
  * Return value:
- *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
- *  = 0   Interrupt was coalesced (previous irq is still pending)
- *  > 0   Number of CPUs interrupt was delivered to
+ *  -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context.
+ *  Other values - No need to retry.
  */
-int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level)
+int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level)
 {
-	struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
-	int ret = -1, i = 0;
+	struct kvm_kernel_irq_routing_entry *e;
+	int ret = -EINVAL;
 	struct kvm_irq_routing_table *irq_rt;
-	struct hlist_node *n;
+	int idx;
 
 	trace_kvm_set_irq(irq, level, irq_source_id);
 
-	/* Not possible to detect if the guest uses the PIC or the
-	 * IOAPIC.  So set the bit in both. The guest will ignore
-	 * writes to the unused one.
+	/*
+	 * Injection into either PIC or IOAPIC might need to scan all CPUs,
+	 * which would need to be retried from thread context;  when same GSI
+	 * is connected to both PIC and IOAPIC, we'd have to report a
+	 * partial failure here.
+	 * Since there's no easy way to do this, we only support injecting MSI
+	 * which is limited to 1:1 GSI mapping.
 	 */
-	rcu_read_lock();
-	irq_rt = rcu_dereference(kvm->irq_routing);
+	idx = srcu_read_lock(&kvm->irq_srcu);
+	irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
 	if (irq < irq_rt->nr_rt_entries)
-		hlist_for_each_entry(e, n, &irq_rt->map[irq], link)
-			irq_set[i++] = *e;
-	rcu_read_unlock();
-
-	while(i--) {
-		int r;
-		r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level);
-		if (r < 0)
-			continue;
-
-		ret = r + ((ret < 0) ? 0 : ret);
-	}
-
+		hlist_for_each_entry(e, &irq_rt->map[irq], link) {
+			if (likely(e->type == KVM_IRQ_ROUTING_MSI))
+				ret = kvm_set_msi_inatomic(e, kvm);
+			else
+				ret = -EWOULDBLOCK;
+			break;
+		}
+	srcu_read_unlock(&kvm->irq_srcu, idx);
 	return ret;
 }
 
-void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
-{
-	struct kvm_irq_ack_notifier *kian;
-	struct hlist_node *n;
-	int gsi;
-
-	trace_kvm_ack_irq(irqchip, pin);
-
-	rcu_read_lock();
-	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
-	if (gsi != -1)
-		hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
-					 link)
-			if (kian->gsi == gsi)
-				kian->irq_acked(kian);
-	rcu_read_unlock();
-}
-
-void kvm_register_irq_ack_notifier(struct kvm *kvm,
-				   struct kvm_irq_ack_notifier *kian)
-{
-	mutex_lock(&kvm->irq_lock);
-	hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
-	mutex_unlock(&kvm->irq_lock);
-}
-
-void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
-				    struct kvm_irq_ack_notifier *kian)
-{
-	mutex_lock(&kvm->irq_lock);
-	hlist_del_init_rcu(&kian->link);
-	mutex_unlock(&kvm->irq_lock);
-	synchronize_rcu();
-}
-
 int kvm_request_irq_source_id(struct kvm *kvm)
 {
 	unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
@@ -226,6 +204,9 @@ int kvm_request_irq_source_id(struct kvm *kvm)
 	}
 
 	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
+#ifdef CONFIG_X86
+	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
+#endif
 	set_bit(irq_source_id, bitmap);
 unlock:
 	mutex_unlock(&kvm->irq_lock);
@@ -235,9 +216,10 @@ unlock:
 
 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 {
-	int i;
-
 	ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID);
+#ifdef CONFIG_X86
+	ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID);
+#endif
 
 	mutex_lock(&kvm->irq_lock);
 	if (irq_source_id < 0 ||
@@ -249,14 +231,10 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 	if (!irqchip_in_kernel(kvm))
 		goto unlock;
 
-	for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++) {
-		clear_bit(irq_source_id, &kvm->arch.vioapic->irq_states[i]);
-		if (i >= 16)
-			continue;
+	kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);
 #ifdef CONFIG_X86
-		clear_bit(irq_source_id, &pic_irqchip(kvm)->irq_states[i]);
+	kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id);
 #endif
-	}
 unlock:
 	mutex_unlock(&kvm->irq_lock);
 }
@@ -276,64 +254,43 @@ void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
 	mutex_lock(&kvm->irq_lock);
 	hlist_del_rcu(&kimn->link);
 	mutex_unlock(&kvm->irq_lock);
-	synchronize_rcu();
+	synchronize_srcu(&kvm->irq_srcu);
 }
 
 void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
 			     bool mask)
 {
 	struct kvm_irq_mask_notifier *kimn;
-	struct hlist_node *n;
-	int gsi;
+	int idx, gsi;
 
-	rcu_read_lock();
-	gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+	idx = srcu_read_lock(&kvm->irq_srcu);
+	gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin];
 	if (gsi != -1)
-		hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link)
+		hlist_for_each_entry_rcu(kimn, &kvm->mask_notifier_list, link)
 			if (kimn->irq == gsi)
 				kimn->func(kimn, mask);
-	rcu_read_unlock();
-}
-
-void kvm_free_irq_routing(struct kvm *kvm)
-{
-	/* Called only during vm destruction. Nobody can use the pointer
-	   at this stage */
-	kfree(kvm->irq_routing);
+	srcu_read_unlock(&kvm->irq_srcu, idx);
 }
 
-static int setup_routing_entry(struct kvm_irq_routing_table *rt,
-			       struct kvm_kernel_irq_routing_entry *e,
-			       const struct kvm_irq_routing_entry *ue)
+int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
+			  struct kvm_kernel_irq_routing_entry *e,
+			  const struct kvm_irq_routing_entry *ue)
 {
 	int r = -EINVAL;
 	int delta;
 	unsigned max_pin;
-	struct kvm_kernel_irq_routing_entry *ei;
-	struct hlist_node *n;
 
-	/*
-	 * Do not allow GSI to be mapped to the same irqchip more than once.
-	 * Allow only one to one mapping between GSI and MSI.
-	 */
-	hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link)
-		if (ei->type == KVM_IRQ_ROUTING_MSI ||
-		    ue->u.irqchip.irqchip == ei->irqchip.irqchip)
-			return r;
-
-	e->gsi = ue->gsi;
-	e->type = ue->type;
 	switch (ue->type) {
 	case KVM_IRQ_ROUTING_IRQCHIP:
 		delta = 0;
 		switch (ue->u.irqchip.irqchip) {
 		case KVM_IRQCHIP_PIC_MASTER:
 			e->set = kvm_set_pic_irq;
-			max_pin = 16;
+			max_pin = PIC_NUM_PINS;
 			break;
 		case KVM_IRQCHIP_PIC_SLAVE:
 			e->set = kvm_set_pic_irq;
-			max_pin = 16;
+			max_pin = PIC_NUM_PINS;
 			delta = 8;
 			break;
 		case KVM_IRQCHIP_IOAPIC:
@@ -359,66 +316,8 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
 		goto out;
 	}
 
-	hlist_add_head(&e->link, &rt->map[e->gsi]);
-	r = 0;
-out:
-	return r;
-}
-
-
-int kvm_set_irq_routing(struct kvm *kvm,
-			const struct kvm_irq_routing_entry *ue,
-			unsigned nr,
-			unsigned flags)
-{
-	struct kvm_irq_routing_table *new, *old;
-	u32 i, j, nr_rt_entries = 0;
-	int r;
-
-	for (i = 0; i < nr; ++i) {
-		if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
-			return -EINVAL;
-		nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
-	}
-
-	nr_rt_entries += 1;
-
-	new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
-		      + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
-		      GFP_KERNEL);
-
-	if (!new)
-		return -ENOMEM;
-
-	new->rt_entries = (void *)&new->map[nr_rt_entries];
-
-	new->nr_rt_entries = nr_rt_entries;
-	for (i = 0; i < 3; i++)
-		for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
-			new->chip[i][j] = -1;
-
-	for (i = 0; i < nr; ++i) {
-		r = -EINVAL;
-		if (ue->flags)
-			goto out;
-		r = setup_routing_entry(new, &new->rt_entries[i], ue);
-		if (r)
-			goto out;
-		++ue;
-	}
-
-	mutex_lock(&kvm->irq_lock);
-	old = kvm->irq_routing;
-	kvm_irq_routing_update(kvm, new);
-	mutex_unlock(&kvm->irq_lock);
-
-	synchronize_rcu();
-
-	new = old;
 	r = 0;
-
 out:
-	kfree(new);
 	return r;
 }
 
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
new file mode 100644
index 00000000000..b43c275775c
--- /dev/null
+++ b/virt/kvm/irqchip.c
@@ -0,0 +1,238 @@
+/*
+ * irqchip.c: Common API for in kernel interrupt controllers
+ * Copyright (c) 2007, Intel Corporation.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ * Copyright (c) 2013, Alexander Graf <agraf@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * This file is derived from virt/kvm/irq_comm.c.
+ *
+ * Authors:
+ *   Yaozu (Eddie) Dong <Eddie.dong@intel.com>
+ *   Alexander Graf <agraf@suse.de>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/slab.h>
+#include <linux/srcu.h>
+#include <linux/export.h>
+#include <trace/events/kvm.h>
+#include "irq.h"
+
+bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
+	struct kvm_irq_ack_notifier *kian;
+	int gsi, idx;
+
+	idx = srcu_read_lock(&kvm->irq_srcu);
+	gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin];
+	if (gsi != -1)
+		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+					 link)
+			if (kian->gsi == gsi) {
+				srcu_read_unlock(&kvm->irq_srcu, idx);
+				return true;
+			}
+
+	srcu_read_unlock(&kvm->irq_srcu, idx);
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
+
+void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
+	struct kvm_irq_ack_notifier *kian;
+	int gsi, idx;
+
+	trace_kvm_ack_irq(irqchip, pin);
+
+	idx = srcu_read_lock(&kvm->irq_srcu);
+	gsi = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu)->chip[irqchip][pin];
+	if (gsi != -1)
+		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+					 link)
+			if (kian->gsi == gsi)
+				kian->irq_acked(kian);
+	srcu_read_unlock(&kvm->irq_srcu, idx);
+}
+
+void kvm_register_irq_ack_notifier(struct kvm *kvm,
+				   struct kvm_irq_ack_notifier *kian)
+{
+	mutex_lock(&kvm->irq_lock);
+	hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
+	mutex_unlock(&kvm->irq_lock);
+#ifdef __KVM_HAVE_IOAPIC
+	kvm_vcpu_request_scan_ioapic(kvm);
+#endif
+}
+
+void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
+				    struct kvm_irq_ack_notifier *kian)
+{
+	mutex_lock(&kvm->irq_lock);
+	hlist_del_init_rcu(&kian->link);
+	mutex_unlock(&kvm->irq_lock);
+	synchronize_srcu(&kvm->irq_srcu);
+#ifdef __KVM_HAVE_IOAPIC
+	kvm_vcpu_request_scan_ioapic(kvm);
+#endif
+}
+
+int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+	struct kvm_kernel_irq_routing_entry route;
+
+	if (!irqchip_in_kernel(kvm) || msi->flags != 0)
+		return -EINVAL;
+
+	route.msi.address_lo = msi->address_lo;
+	route.msi.address_hi = msi->address_hi;
+	route.msi.data = msi->data;
+
+	return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
+}
+
+/*
+ * Return value:
+ *  < 0   Interrupt was ignored (masked or not delivered for other reasons)
+ *  = 0   Interrupt was coalesced (previous irq is still pending)
+ *  > 0   Number of CPUs interrupt was delivered to
+ */
+int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
+		bool line_status)
+{
+	struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
+	int ret = -1, i = 0, idx;
+	struct kvm_irq_routing_table *irq_rt;
+
+	trace_kvm_set_irq(irq, level, irq_source_id);
+
+	/* Not possible to detect if the guest uses the PIC or the
+	 * IOAPIC.  So set the bit in both. The guest will ignore
+	 * writes to the unused one.
+	 */
+	idx = srcu_read_lock(&kvm->irq_srcu);
+	irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
+	if (irq < irq_rt->nr_rt_entries)
+		hlist_for_each_entry(e, &irq_rt->map[irq], link)
+			irq_set[i++] = *e;
+	srcu_read_unlock(&kvm->irq_srcu, idx);
+
+	while(i--) {
+		int r;
+		r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
+				   line_status);
+		if (r < 0)
+			continue;
+
+		ret = r + ((ret < 0) ? 0 : ret);
+	}
+
+	return ret;
+}
+
+void kvm_free_irq_routing(struct kvm *kvm)
+{
+	/* Called only during vm destruction. Nobody can use the pointer
+	   at this stage */
+	kfree(kvm->irq_routing);
+}
+
+static int setup_routing_entry(struct kvm_irq_routing_table *rt,
+			       struct kvm_kernel_irq_routing_entry *e,
+			       const struct kvm_irq_routing_entry *ue)
+{
+	int r = -EINVAL;
+	struct kvm_kernel_irq_routing_entry *ei;
+
+	/*
+	 * Do not allow GSI to be mapped to the same irqchip more than once.
+	 * Allow only one to one mapping between GSI and MSI.
+	 */
+	hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
+		if (ei->type == KVM_IRQ_ROUTING_MSI ||
+		    ue->type == KVM_IRQ_ROUTING_MSI ||
+		    ue->u.irqchip.irqchip == ei->irqchip.irqchip)
+			return r;
+
+	e->gsi = ue->gsi;
+	e->type = ue->type;
+	r = kvm_set_routing_entry(rt, e, ue);
+	if (r)
+		goto out;
+
+	hlist_add_head(&e->link, &rt->map[e->gsi]);
+	r = 0;
+out:
+	return r;
+}
+
+int kvm_set_irq_routing(struct kvm *kvm,
+			const struct kvm_irq_routing_entry *ue,
+			unsigned nr,
+			unsigned flags)
+{
+	struct kvm_irq_routing_table *new, *old;
+	u32 i, j, nr_rt_entries = 0;
+	int r;
+
+	for (i = 0; i < nr; ++i) {
+		if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
+			return -EINVAL;
+		nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
+	}
+
+	nr_rt_entries += 1;
+
+	new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
+		      + (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
+		      GFP_KERNEL);
+
+	if (!new)
+		return -ENOMEM;
+
+	new->rt_entries = (void *)&new->map[nr_rt_entries];
+
+	new->nr_rt_entries = nr_rt_entries;
+	for (i = 0; i < KVM_NR_IRQCHIPS; i++)
+		for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
+			new->chip[i][j] = -1;
+
+	for (i = 0; i < nr; ++i) {
+		r = -EINVAL;
+		if (ue->flags)
+			goto out;
+		r = setup_routing_entry(new, &new->rt_entries[i], ue);
+		if (r)
+			goto out;
+		++ue;
+	}
+
+	mutex_lock(&kvm->irq_lock);
+	old = kvm->irq_routing;
+	kvm_irq_routing_update(kvm, new);
+	mutex_unlock(&kvm->irq_lock);
+
+	synchronize_srcu_expedited(&kvm->irq_srcu);
+
+	new = old;
+	r = 0;
+
+out:
+	kfree(new);
+	return r;
+}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a91f980077d..4b6c01b477f 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -70,7 +70,8 @@ MODULE_LICENSE("GPL");
  * 		kvm->lock --> kvm->slots_lock --> kvm->irq_lock
  */
 
-DEFINE_RAW_SPINLOCK(kvm_lock);
+DEFINE_SPINLOCK(kvm_lock);
+static DEFINE_RAW_SPINLOCK(kvm_count_lock);
 LIST_HEAD(vm_list);
 
 static cpumask_var_t cpus_hardware_enabled;
@@ -94,42 +95,22 @@ static int hardware_enable_all(void);
 static void hardware_disable_all(void);
 
 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
+static void update_memslots(struct kvm_memslots *slots,
+			    struct kvm_memory_slot *new, u64 last_generation);
 
-bool kvm_rebooting;
+static void kvm_release_pfn_dirty(pfn_t pfn);
+static void mark_page_dirty_in_slot(struct kvm *kvm,
+				    struct kvm_memory_slot *memslot, gfn_t gfn);
+
+__visible bool kvm_rebooting;
 EXPORT_SYMBOL_GPL(kvm_rebooting);
 
 static bool largepages_enabled = true;
 
-static struct page *hwpoison_page;
-static pfn_t hwpoison_pfn;
-
-struct page *fault_page;
-pfn_t fault_pfn;
-
-inline int kvm_is_mmio_pfn(pfn_t pfn)
-{
-	if (pfn_valid(pfn)) {
-		int reserved;
-		struct page *tail = pfn_to_page(pfn);
-		struct page *head = compound_trans_head(tail);
-		reserved = PageReserved(head);
-		if (head != tail) {
-			/*
-			 * "head" is not a dangling pointer
-			 * (compound_trans_head takes care of that)
-			 * but the hugepage may have been splitted
-			 * from under us (and we may not hold a
-			 * reference count on the head page so it can
-			 * be reused before we run PageReferenced), so
-			 * we've to check PageTail before returning
-			 * what we just read.
-			 */
-			smp_rmb();
-			if (PageTail(tail))
-				return reserved;
-		}
-		return PageReserved(tail);
-	}
+bool kvm_is_mmio_pfn(pfn_t pfn)
+{
+	if (pfn_valid(pfn))
+		return PageReserved(pfn_to_page(pfn));
 
 	return true;
 }
@@ -137,11 +118,12 @@ inline int kvm_is_mmio_pfn(pfn_t pfn)
 /*
  * Switches to specified vcpu, until a matching vcpu_put()
  */
-void vcpu_load(struct kvm_vcpu *vcpu)
+int vcpu_load(struct kvm_vcpu *vcpu)
 {
 	int cpu;
 
-	mutex_lock(&vcpu->mutex);
+	if (mutex_lock_killable(&vcpu->mutex))
+		return -EINTR;
 	if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
 		/* The thread running this VCPU changed. */
 		struct pid *oldpid = vcpu->pid;
@@ -154,6 +136,7 @@ void vcpu_load(struct kvm_vcpu *vcpu)
 	preempt_notifier_register(&vcpu->preempt_notifier);
 	kvm_arch_vcpu_load(vcpu, cpu);
 	put_cpu();
+	return 0;
 }
 
 void vcpu_put(struct kvm_vcpu *vcpu)
@@ -203,19 +186,30 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 
 void kvm_flush_remote_tlbs(struct kvm *kvm)
 {
-	int dirty_count = kvm->tlbs_dirty;
+	long dirty_count = kvm->tlbs_dirty;
 
 	smp_mb();
 	if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 		++kvm->stat.remote_tlb_flush;
 	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
+EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
 
 void kvm_reload_remote_mmus(struct kvm *kvm)
 {
 	make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 }
 
+void kvm_make_mclock_inprogress_request(struct kvm *kvm)
+{
+	make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
+}
+
+void kvm_make_scan_ioapic_request(struct kvm *kvm)
+{
+	make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
+}
+
 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
 	struct page *page;
@@ -236,6 +230,10 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 	}
 	vcpu->run = page_address(page);
 
+	kvm_vcpu_set_in_spin_loop(vcpu, false);
+	kvm_vcpu_set_dy_eligible(vcpu, false);
+	vcpu->preempted = false;
+
 	r = kvm_arch_vcpu_init(vcpu);
 	if (r < 0)
 		goto fail_free_run;
@@ -289,15 +287,15 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 	 */
 	idx = srcu_read_lock(&kvm->srcu);
 	spin_lock(&kvm->mmu_lock);
+
 	kvm->mmu_notifier_seq++;
 	need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
-	spin_unlock(&kvm->mmu_lock);
-	srcu_read_unlock(&kvm->srcu, idx);
-
 	/* we've to flush the tlb before the pages can be freed */
 	if (need_tlb_flush)
 		kvm_flush_remote_tlbs(kvm);
 
+	spin_unlock(&kvm->mmu_lock);
+	srcu_read_unlock(&kvm->srcu, idx);
 }
 
 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
@@ -332,15 +330,14 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 	 * count is also read inside the mmu_lock critical section.
 	 */
 	kvm->mmu_notifier_count++;
-	for (; start < end; start += PAGE_SIZE)
-		need_tlb_flush |= kvm_unmap_hva(kvm, start);
+	need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
 	need_tlb_flush |= kvm->tlbs_dirty;
-	spin_unlock(&kvm->mmu_lock);
-	srcu_read_unlock(&kvm->srcu, idx);
-
 	/* we've to flush the tlb before the pages can be freed */
 	if (need_tlb_flush)
 		kvm_flush_remote_tlbs(kvm);
+
+	spin_unlock(&kvm->mmu_lock);
+	srcu_read_unlock(&kvm->srcu, idx);
 }
 
 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
@@ -357,11 +354,11 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 	 * been freed.
 	 */
 	kvm->mmu_notifier_seq++;
+	smp_wmb();
 	/*
 	 * The above sequence increase must be visible before the
-	 * below count decrease but both values are read by the kvm
-	 * page fault under mmu_lock spinlock so we don't need to add
-	 * a smb_wmb() here in between the two.
+	 * below count decrease, which is ensured by the smp_wmb above
+	 * in conjunction with the smp_rmb in mmu_notifier_retry().
 	 */
 	kvm->mmu_notifier_count--;
 	spin_unlock(&kvm->mmu_lock);
@@ -378,13 +375,14 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 
 	idx = srcu_read_lock(&kvm->srcu);
 	spin_lock(&kvm->mmu_lock);
-	young = kvm_age_hva(kvm, address);
-	spin_unlock(&kvm->mmu_lock);
-	srcu_read_unlock(&kvm->srcu, idx);
 
+	young = kvm_age_hva(kvm, address);
 	if (young)
 		kvm_flush_remote_tlbs(kvm);
 
+	spin_unlock(&kvm->mmu_lock);
+	srcu_read_unlock(&kvm->srcu, idx);
+
 	return young;
 }
 
@@ -411,7 +409,7 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 	int idx;
 
 	idx = srcu_read_lock(&kvm->srcu);
-	kvm_arch_flush_shadow(kvm);
+	kvm_arch_flush_shadow_all(kvm);
 	srcu_read_unlock(&kvm->srcu, idx);
 }
 
@@ -449,7 +447,7 @@ static void kvm_init_memslots_id(struct kvm *kvm)
 		slots->id_to_index[i] = slots->memslots[i].id = i;
 }
 
-static struct kvm *kvm_create_vm(void)
+static struct kvm *kvm_create_vm(unsigned long type)
 {
 	int r, i;
 	struct kvm *kvm = kvm_arch_alloc_vm();
@@ -457,26 +455,30 @@ static struct kvm *kvm_create_vm(void)
 	if (!kvm)
 		return ERR_PTR(-ENOMEM);
 
-	r = kvm_arch_init_vm(kvm);
+	r = kvm_arch_init_vm(kvm, type);
 	if (r)
-		goto out_err_nodisable;
+		goto out_err_no_disable;
 
 	r = hardware_enable_all();
 	if (r)
-		goto out_err_nodisable;
+		goto out_err_no_disable;
 
 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 	INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 	INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 #endif
 
+	BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
+
 	r = -ENOMEM;
 	kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 	if (!kvm->memslots)
-		goto out_err_nosrcu;
+		goto out_err_no_srcu;
 	kvm_init_memslots_id(kvm);
 	if (init_srcu_struct(&kvm->srcu))
-		goto out_err_nosrcu;
+		goto out_err_no_srcu;
+	if (init_srcu_struct(&kvm->irq_srcu))
+		goto out_err_no_irq_srcu;
 	for (i = 0; i < KVM_NR_BUSES; i++) {
 		kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
 					GFP_KERNEL);
@@ -492,22 +494,25 @@ static struct kvm *kvm_create_vm(void)
 	mutex_init(&kvm->irq_lock);
 	mutex_init(&kvm->slots_lock);
 	atomic_set(&kvm->users_count, 1);
+	INIT_LIST_HEAD(&kvm->devices);
 
 	r = kvm_init_mmu_notifier(kvm);
 	if (r)
 		goto out_err;
 
-	raw_spin_lock(&kvm_lock);
+	spin_lock(&kvm_lock);
 	list_add(&kvm->vm_list, &vm_list);
-	raw_spin_unlock(&kvm_lock);
+	spin_unlock(&kvm_lock);
 
 	return kvm;
 
 out_err:
+	cleanup_srcu_struct(&kvm->irq_srcu);
+out_err_no_irq_srcu:
 	cleanup_srcu_struct(&kvm->srcu);
-out_err_nosrcu:
+out_err_no_srcu:
 	hardware_disable_all();
-out_err_nodisable:
+out_err_no_disable:
 	for (i = 0; i < KVM_NR_BUSES; i++)
 		kfree(kvm->buses[i]);
 	kfree(kvm->memslots);
@@ -515,66 +520,82 @@ out_err_nodisable:
 	return ERR_PTR(r);
 }
 
+/*
+ * Avoid using vmalloc for a small buffer.
+ * Should not be used when the size is statically known.
+ */
+void *kvm_kvzalloc(unsigned long size)
+{
+	if (size > PAGE_SIZE)
+		return vzalloc(size);
+	else
+		return kzalloc(size, GFP_KERNEL);
+}
+
+void kvm_kvfree(const void *addr)
+{
+	if (is_vmalloc_addr(addr))
+		vfree(addr);
+	else
+		kfree(addr);
+}
+
 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
 {
 	if (!memslot->dirty_bitmap)
 		return;
 
-	if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
-		vfree(memslot->dirty_bitmap_head);
-	else
-		kfree(memslot->dirty_bitmap_head);
-
+	kvm_kvfree(memslot->dirty_bitmap);
 	memslot->dirty_bitmap = NULL;
-	memslot->dirty_bitmap_head = NULL;
 }
 
 /*
  * Free any memory in @free but not in @dont.
  */
-static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
+static void kvm_free_physmem_slot(struct kvm *kvm, struct kvm_memory_slot *free,
 				  struct kvm_memory_slot *dont)
 {
-	int i;
-
-	if (!dont || free->rmap != dont->rmap)
-		vfree(free->rmap);
-
 	if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 		kvm_destroy_dirty_bitmap(free);
 
-
-	for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
-		if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
-			vfree(free->lpage_info[i]);
-			free->lpage_info[i] = NULL;
-		}
-	}
+	kvm_arch_free_memslot(kvm, free, dont);
 
 	free->npages = 0;
-	free->rmap = NULL;
 }
 
-void kvm_free_physmem(struct kvm *kvm)
+static void kvm_free_physmem(struct kvm *kvm)
 {
 	struct kvm_memslots *slots = kvm->memslots;
 	struct kvm_memory_slot *memslot;
 
 	kvm_for_each_memslot(memslot, slots)
-		kvm_free_physmem_slot(memslot, NULL);
+		kvm_free_physmem_slot(kvm, memslot, NULL);
 
 	kfree(kvm->memslots);
 }
 
+static void kvm_destroy_devices(struct kvm *kvm)
+{
+	struct list_head *node, *tmp;
+
+	list_for_each_safe(node, tmp, &kvm->devices) {
+		struct kvm_device *dev =
+			list_entry(node, struct kvm_device, vm_node);
+
+		list_del(node);
+		dev->ops->destroy(dev);
+	}
+}
+
 static void kvm_destroy_vm(struct kvm *kvm)
 {
 	int i;
 	struct mm_struct *mm = kvm->mm;
 
 	kvm_arch_sync_events(kvm);
-	raw_spin_lock(&kvm_lock);
+	spin_lock(&kvm_lock);
 	list_del(&kvm->vm_list);
-	raw_spin_unlock(&kvm_lock);
+	spin_unlock(&kvm_lock);
 	kvm_free_irq_routing(kvm);
 	for (i = 0; i < KVM_NR_BUSES; i++)
 		kvm_io_bus_destroy(kvm->buses[i]);
@@ -582,10 +603,12 @@ static void kvm_destroy_vm(struct kvm *kvm)
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 	mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 #else
-	kvm_arch_flush_shadow(kvm);
+	kvm_arch_flush_shadow_all(kvm);
 #endif
 	kvm_arch_destroy_vm(kvm);
+	kvm_destroy_devices(kvm);
 	kvm_free_physmem(kvm);
+	cleanup_srcu_struct(&kvm->irq_srcu);
 	cleanup_srcu_struct(&kvm->srcu);
 	kvm_arch_free_vm(kvm);
 	hardware_disable_all();
@@ -616,42 +639,20 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-#ifndef CONFIG_S390
 /*
  * Allocation size is twice as large as the actual dirty bitmap size.
- * This makes it possible to do double buffering: see x86's
- * kvm_vm_ioctl_get_dirty_log().
+ * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
  */
 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
 {
 	unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
 
-	if (dirty_bytes > PAGE_SIZE)
-		memslot->dirty_bitmap = vzalloc(dirty_bytes);
-	else
-		memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
-
+	memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
 	if (!memslot->dirty_bitmap)
 		return -ENOMEM;
 
-	memslot->dirty_bitmap_head = memslot->dirty_bitmap;
-	memslot->nr_dirty_pages = 0;
 	return 0;
 }
-#endif /* !CONFIG_S390 */
-
-static struct kvm_memory_slot *
-search_memslots(struct kvm_memslots *slots, gfn_t gfn)
-{
-	struct kvm_memory_slot *memslot;
-
-	kvm_for_each_memslot(memslot, slots)
-		if (gfn >= memslot->base_gfn &&
-		      gfn < memslot->base_gfn + memslot->npages)
-			return memslot;
-
-	return NULL;
-}
 
 static int cmp_memslot(const void *slot1, const void *slot2)
 {
@@ -683,7 +684,9 @@ static void sort_memslots(struct kvm_memslots *slots)
 		slots->id_to_index[slots->memslots[i].id] = i;
 }
 
-void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
+static void update_memslots(struct kvm_memslots *slots,
+			    struct kvm_memory_slot *new,
+			    u64 last_generation)
 {
 	if (new) {
 		int id = new->id;
@@ -695,7 +698,35 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
 			sort_memslots(slots);
 	}
 
-	slots->generation++;
+	slots->generation = last_generation + 1;
+}
+
+static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
+{
+	u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
+
+#ifdef KVM_CAP_READONLY_MEM
+	valid_flags |= KVM_MEM_READONLY;
+#endif
+
+	if (mem->flags & ~valid_flags)
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
+		struct kvm_memslots *slots, struct kvm_memory_slot *new)
+{
+	struct kvm_memslots *old_memslots = kvm->memslots;
+
+	update_memslots(slots, new, kvm->memslots->generation);
+	rcu_assign_pointer(kvm->memslots, slots);
+	synchronize_srcu_expedited(&kvm->srcu);
+
+	kvm_arch_memslots_updated(kvm);
+
+	return old_memslots;
 }
 
 /*
@@ -707,16 +738,19 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
  * Must be called holding mmap_sem for write.
  */
 int __kvm_set_memory_region(struct kvm *kvm,
-			    struct kvm_userspace_memory_region *mem,
-			    int user_alloc)
+			    struct kvm_userspace_memory_region *mem)
 {
 	int r;
 	gfn_t base_gfn;
 	unsigned long npages;
-	unsigned long i;
-	struct kvm_memory_slot *memslot;
+	struct kvm_memory_slot *slot;
 	struct kvm_memory_slot old, new;
-	struct kvm_memslots *slots, *old_memslots;
+	struct kvm_memslots *slots = NULL, *old_memslots;
+	enum kvm_mr_change change;
+
+	r = check_memory_region_flags(mem);
+	if (r)
+		goto out;
 
 	r = -EINVAL;
 	/* General sanity checks */
@@ -725,7 +759,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
 	if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 		goto out;
 	/* We can read the guest memory with __xxx_user() later on. */
-	if (user_alloc &&
+	if ((mem->slot < KVM_USER_MEM_SLOTS) &&
 	    ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
 	     !access_ok(VERIFY_WRITE,
 			(void __user *)(unsigned long)mem->userspace_addr,
@@ -736,7 +770,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
 	if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 		goto out;
 
-	memslot = id_to_memslot(kvm->memslots, mem->slot);
+	slot = id_to_memslot(kvm->memslots, mem->slot);
 	base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 	npages = mem->memory_size >> PAGE_SHIFT;
 
@@ -747,28 +781,48 @@ int __kvm_set_memory_region(struct kvm *kvm,
 	if (!npages)
 		mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 
-	new = old = *memslot;
+	new = old = *slot;
 
 	new.id = mem->slot;
 	new.base_gfn = base_gfn;
 	new.npages = npages;
 	new.flags = mem->flags;
 
-	/* Disallow changing a memory slot's size. */
 	r = -EINVAL;
-	if (npages && old.npages && npages != old.npages)
-		goto out_free;
+	if (npages) {
+		if (!old.npages)
+			change = KVM_MR_CREATE;
+		else { /* Modify an existing slot. */
+			if ((mem->userspace_addr != old.userspace_addr) ||
+			    (npages != old.npages) ||
+			    ((new.flags ^ old.flags) & KVM_MEM_READONLY))
+				goto out;
 
-	/* Check for overlaps */
-	r = -EEXIST;
-	for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
-		struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
+			if (base_gfn != old.base_gfn)
+				change = KVM_MR_MOVE;
+			else if (new.flags != old.flags)
+				change = KVM_MR_FLAGS_ONLY;
+			else { /* Nothing to change. */
+				r = 0;
+				goto out;
+			}
+		}
+	} else if (old.npages) {
+		change = KVM_MR_DELETE;
+	} else /* Modify a non-existent slot: disallowed. */
+		goto out;
 
-		if (s == memslot || !s->npages)
-			continue;
-		if (!((base_gfn + npages <= s->base_gfn) ||
-		      (base_gfn >= s->base_gfn + s->npages)))
-			goto out_free;
+	if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
+		/* Check for overlaps */
+		r = -EEXIST;
+		kvm_for_each_memslot(slot, kvm->memslots) {
+			if ((slot->id >= KVM_USER_MEM_SLOTS) ||
+			    (slot->id == mem->slot))
+				continue;
+			if (!((base_gfn + npages <= slot->base_gfn) ||
+			      (base_gfn >= slot->base_gfn + slot->npages)))
+				goto out;
+		}
 	}
 
 	/* Free page dirty bitmap if unneeded */
@@ -776,75 +830,20 @@ int __kvm_set_memory_region(struct kvm *kvm,
 		new.dirty_bitmap = NULL;
 
 	r = -ENOMEM;
-
-	/* Allocate if a slot is being created */
-#ifndef CONFIG_S390
-	if (npages && !new.rmap) {
-		new.rmap = vzalloc(npages * sizeof(*new.rmap));
-
-		if (!new.rmap)
-			goto out_free;
-
-		new.user_alloc = user_alloc;
+	if (change == KVM_MR_CREATE) {
 		new.userspace_addr = mem->userspace_addr;
-	}
-	if (!npages)
-		goto skip_lpage;
-
-	for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
-		unsigned long ugfn;
-		unsigned long j;
-		int lpages;
-		int level = i + 2;
-
-		/* Avoid unused variable warning if no large pages */
-		(void)level;
-
-		if (new.lpage_info[i])
-			continue;
 
-		lpages = 1 + ((base_gfn + npages - 1)
-			     >> KVM_HPAGE_GFN_SHIFT(level));
-		lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
-
-		new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
-
-		if (!new.lpage_info[i])
+		if (kvm_arch_create_memslot(kvm, &new, npages))
 			goto out_free;
-
-		if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
-			new.lpage_info[i][0].write_count = 1;
-		if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
-			new.lpage_info[i][lpages - 1].write_count = 1;
-		ugfn = new.userspace_addr >> PAGE_SHIFT;
-		/*
-		 * If the gfn and userspace address are not aligned wrt each
-		 * other, or if explicitly asked to, disable large page
-		 * support for this slot
-		 */
-		if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
-		    !largepages_enabled)
-			for (j = 0; j < lpages; ++j)
-				new.lpage_info[i][j].write_count = 1;
 	}
 
-skip_lpage:
-
 	/* Allocate page dirty bitmap if needed */
 	if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 		if (kvm_create_dirty_bitmap(&new) < 0)
 			goto out_free;
-		/* destroy any largepage mappings for dirty tracking */
 	}
-#else  /* not defined CONFIG_S390 */
-	new.user_alloc = user_alloc;
-	if (user_alloc)
-		new.userspace_addr = mem->userspace_addr;
-#endif /* not defined CONFIG_S390 */
-
-	if (!npages) {
-		struct kvm_memory_slot *slot;
 
+	if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
 		r = -ENOMEM;
 		slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
 				GFP_KERNEL);
@@ -853,95 +852,94 @@ skip_lpage:
 		slot = id_to_memslot(slots, mem->slot);
 		slot->flags |= KVM_MEMSLOT_INVALID;
 
-		update_memslots(slots, NULL);
+		old_memslots = install_new_memslots(kvm, slots, NULL);
 
-		old_memslots = kvm->memslots;
-		rcu_assign_pointer(kvm->memslots, slots);
-		synchronize_srcu_expedited(&kvm->srcu);
-		/* From this point no new shadow pages pointing to a deleted
-		 * memslot will be created.
+		/* slot was deleted or moved, clear iommu mapping */
+		kvm_iommu_unmap_pages(kvm, &old);
+		/* From this point no new shadow pages pointing to a deleted,
+		 * or moved, memslot will be created.
 		 *
 		 * validation of sp->gfn happens in:
 		 * 	- gfn_to_hva (kvm_read_guest, gfn_to_pfn)
 		 * 	- kvm_is_visible_gfn (mmu_check_roots)
 		 */
-		kvm_arch_flush_shadow(kvm);
-		kfree(old_memslots);
+		kvm_arch_flush_shadow_memslot(kvm, slot);
+		slots = old_memslots;
 	}
 
-	r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
+	r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
 	if (r)
-		goto out_free;
+		goto out_slots;
 
-	/* map the pages in iommu page table */
-	if (npages) {
-		r = kvm_iommu_map_pages(kvm, &new);
-		if (r)
+	r = -ENOMEM;
+	/*
+	 * We can re-use the old_memslots from above, the only difference
+	 * from the currently installed memslots is the invalid flag.  This
+	 * will get overwritten by update_memslots anyway.
+	 */
+	if (!slots) {
+		slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
+				GFP_KERNEL);
+		if (!slots)
 			goto out_free;
 	}
 
-	r = -ENOMEM;
-	slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
-			GFP_KERNEL);
-	if (!slots)
-		goto out_free;
-
 	/* actual memory is freed via old in kvm_free_physmem_slot below */
-	if (!npages) {
-		new.rmap = NULL;
+	if (change == KVM_MR_DELETE) {
 		new.dirty_bitmap = NULL;
-		for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
-			new.lpage_info[i] = NULL;
+		memset(&new.arch, 0, sizeof(new.arch));
 	}
 
-	update_memslots(slots, &new);
-	old_memslots = kvm->memslots;
-	rcu_assign_pointer(kvm->memslots, slots);
-	synchronize_srcu_expedited(&kvm->srcu);
+	old_memslots = install_new_memslots(kvm, slots, &new);
 
-	kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
+	kvm_arch_commit_memory_region(kvm, mem, &old, change);
+
+	kvm_free_physmem_slot(kvm, &old, &new);
+	kfree(old_memslots);
 
 	/*
-	 * If the new memory slot is created, we need to clear all
-	 * mmio sptes.
+	 * IOMMU mapping:  New slots need to be mapped.  Old slots need to be
+	 * un-mapped and re-mapped if their base changes.  Since base change
+	 * unmapping is handled above with slot deletion, mapping alone is
+	 * needed here.  Anything else the iommu might care about for existing
+	 * slots (size changes, userspace addr changes and read-only flag
+	 * changes) is disallowed above, so any other attribute changes getting
+	 * here can be skipped.
 	 */
-	if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
-		kvm_arch_flush_shadow(kvm);
-
-	kvm_free_physmem_slot(&old, &new);
-	kfree(old_memslots);
+	if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
+		r = kvm_iommu_map_pages(kvm, &new);
+		return r;
+	}
 
 	return 0;
 
+out_slots:
+	kfree(slots);
 out_free:
-	kvm_free_physmem_slot(&new, &old);
+	kvm_free_physmem_slot(kvm, &new, &old);
 out:
 	return r;
-
 }
 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 
 int kvm_set_memory_region(struct kvm *kvm,
-			  struct kvm_userspace_memory_region *mem,
-			  int user_alloc)
+			  struct kvm_userspace_memory_region *mem)
 {
 	int r;
 
 	mutex_lock(&kvm->slots_lock);
-	r = __kvm_set_memory_region(kvm, mem, user_alloc);
+	r = __kvm_set_memory_region(kvm, mem);
 	mutex_unlock(&kvm->slots_lock);
 	return r;
 }
 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 
-int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
-				   struct
-				   kvm_userspace_memory_region *mem,
-				   int user_alloc)
+static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
+					  struct kvm_userspace_memory_region *mem)
 {
-	if (mem->slot >= KVM_MEMORY_SLOTS)
+	if (mem->slot >= KVM_USER_MEM_SLOTS)
 		return -EINVAL;
-	return kvm_set_memory_region(kvm, mem, user_alloc);
+	return kvm_set_memory_region(kvm, mem);
 }
 
 int kvm_get_dirty_log(struct kvm *kvm,
@@ -953,7 +951,7 @@ int kvm_get_dirty_log(struct kvm *kvm,
 	unsigned long any = 0;
 
 	r = -EINVAL;
-	if (log->slot >= KVM_MEMORY_SLOTS)
+	if (log->slot >= KVM_USER_MEM_SLOTS)
 		goto out;
 
 	memslot = id_to_memslot(kvm->memslots, log->slot);
@@ -977,65 +975,18 @@ int kvm_get_dirty_log(struct kvm *kvm,
 out:
 	return r;
 }
+EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
 
-void kvm_disable_largepages(void)
-{
-	largepages_enabled = false;
-}
-EXPORT_SYMBOL_GPL(kvm_disable_largepages);
-
-int is_error_page(struct page *page)
-{
-	return page == bad_page || page == hwpoison_page || page == fault_page;
-}
-EXPORT_SYMBOL_GPL(is_error_page);
-
-int is_error_pfn(pfn_t pfn)
-{
-	return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
-}
-EXPORT_SYMBOL_GPL(is_error_pfn);
-
-int is_hwpoison_pfn(pfn_t pfn)
-{
-	return pfn == hwpoison_pfn;
-}
-EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
-
-int is_fault_pfn(pfn_t pfn)
-{
-	return pfn == fault_pfn;
-}
-EXPORT_SYMBOL_GPL(is_fault_pfn);
-
-int is_noslot_pfn(pfn_t pfn)
-{
-	return pfn == bad_pfn;
-}
-EXPORT_SYMBOL_GPL(is_noslot_pfn);
-
-int is_invalid_pfn(pfn_t pfn)
-{
-	return pfn == hwpoison_pfn || pfn == fault_pfn;
-}
-EXPORT_SYMBOL_GPL(is_invalid_pfn);
-
-static inline unsigned long bad_hva(void)
+bool kvm_largepages_enabled(void)
 {
-	return PAGE_OFFSET;
+	return largepages_enabled;
 }
 
-int kvm_is_error_hva(unsigned long addr)
-{
-	return addr == bad_hva();
-}
-EXPORT_SYMBOL_GPL(kvm_is_error_hva);
-
-static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
-						gfn_t gfn)
+void kvm_disable_largepages(void)
 {
-	return search_memslots(slots, gfn);
+	largepages_enabled = false;
 }
+EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 
 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 {
@@ -1047,7 +998,7 @@ int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 {
 	struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
 
-	if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
+	if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
 	      memslot->flags & KVM_MEMSLOT_INVALID)
 		return 0;
 
@@ -1079,31 +1030,71 @@ out:
 	return size;
 }
 
-static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
-				     gfn_t *nr_pages)
+static bool memslot_is_readonly(struct kvm_memory_slot *slot)
+{
+	return slot->flags & KVM_MEM_READONLY;
+}
+
+static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
+				       gfn_t *nr_pages, bool write)
 {
 	if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
-		return bad_hva();
+		return KVM_HVA_ERR_BAD;
+
+	if (memslot_is_readonly(slot) && write)
+		return KVM_HVA_ERR_RO_BAD;
 
 	if (nr_pages)
 		*nr_pages = slot->npages - (gfn - slot->base_gfn);
 
-	return gfn_to_hva_memslot(slot, gfn);
+	return __gfn_to_hva_memslot(slot, gfn);
 }
 
+static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
+				     gfn_t *nr_pages)
+{
+	return __gfn_to_hva_many(slot, gfn, nr_pages, true);
+}
+
+unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
+					gfn_t gfn)
+{
+	return gfn_to_hva_many(slot, gfn, NULL);
+}
+EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
+
 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 {
 	return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
 }
 EXPORT_SYMBOL_GPL(gfn_to_hva);
 
-static pfn_t get_fault_pfn(void)
+/*
+ * If writable is set to false, the hva returned by this function is only
+ * allowed to be read.
+ */
+unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
+{
+	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+	unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
+
+	if (!kvm_is_error_hva(hva) && writable)
+		*writable = !memslot_is_readonly(slot);
+
+	return hva;
+}
+
+static int kvm_read_hva(void *data, void __user *hva, int len)
 {
-	get_page(fault_page);
-	return fault_pfn;
+	return __copy_from_user(data, hva, len);
 }
 
-int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
+static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
+{
+	return __copy_from_user_inatomic(data, hva, len);
+}
+
+static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
 	unsigned long start, int write, struct page **page)
 {
 	int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
@@ -1123,108 +1114,186 @@ static inline int check_user_page_hwpoison(unsigned long addr)
 	return rc == -EHWPOISON;
 }
 
-static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
-			bool *async, bool write_fault, bool *writable)
+/*
+ * The atomic path to get the writable pfn which will be stored in @pfn,
+ * true indicates success, otherwise false is returned.
+ */
+static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
+			    bool write_fault, bool *writable, pfn_t *pfn)
 {
 	struct page *page[1];
-	int npages = 0;
-	pfn_t pfn;
+	int npages;
 
-	/* we can do it either atomically or asynchronously, not both */
-	BUG_ON(atomic && async);
+	if (!(async || atomic))
+		return false;
 
-	BUG_ON(!write_fault && !writable);
+	/*
+	 * Fast pin a writable pfn only if it is a write fault request
+	 * or the caller allows to map a writable pfn for a read fault
+	 * request.
+	 */
+	if (!(write_fault || writable))
+		return false;
 
-	if (writable)
-		*writable = true;
+	npages = __get_user_pages_fast(addr, 1, 1, page);
+	if (npages == 1) {
+		*pfn = page_to_pfn(page[0]);
 
-	if (atomic || async)
-		npages = __get_user_pages_fast(addr, 1, 1, page);
+		if (writable)
+			*writable = true;
+		return true;
+	}
 
-	if (unlikely(npages != 1) && !atomic) {
-		might_sleep();
+	return false;
+}
 
-		if (writable)
-			*writable = write_fault;
+/*
+ * The slow path to get the pfn of the specified host virtual address,
+ * 1 indicates success, -errno is returned if error is detected.
+ */
+static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
+			   bool *writable, pfn_t *pfn)
+{
+	struct page *page[1];
+	int npages = 0;
 
-		if (async) {
-			down_read(&current->mm->mmap_sem);
-			npages = get_user_page_nowait(current, current->mm,
-						     addr, write_fault, page);
-			up_read(&current->mm->mmap_sem);
-		} else
-			npages = get_user_pages_fast(addr, 1, write_fault,
-						     page);
-
-		/* map read fault as writable if possible */
-		if (unlikely(!write_fault) && npages == 1) {
-			struct page *wpage[1];
-
-			npages = __get_user_pages_fast(addr, 1, 1, wpage);
-			if (npages == 1) {
-				*writable = true;
-				put_page(page[0]);
-				page[0] = wpage[0];
-			}
-			npages = 1;
+	might_sleep();
+
+	if (writable)
+		*writable = write_fault;
+
+	if (async) {
+		down_read(&current->mm->mmap_sem);
+		npages = get_user_page_nowait(current, current->mm,
+					      addr, write_fault, page);
+		up_read(&current->mm->mmap_sem);
+	} else
+		npages = get_user_pages_fast(addr, 1, write_fault,
+					     page);
+	if (npages != 1)
+		return npages;
+
+	/* map read fault as writable if possible */
+	if (unlikely(!write_fault) && writable) {
+		struct page *wpage[1];
+
+		npages = __get_user_pages_fast(addr, 1, 1, wpage);
+		if (npages == 1) {
+			*writable = true;
+			put_page(page[0]);
+			page[0] = wpage[0];
 		}
+
+		npages = 1;
 	}
+	*pfn = page_to_pfn(page[0]);
+	return npages;
+}
 
-	if (unlikely(npages != 1)) {
-		struct vm_area_struct *vma;
+static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
+{
+	if (unlikely(!(vma->vm_flags & VM_READ)))
+		return false;
 
-		if (atomic)
-			return get_fault_pfn();
+	if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
+		return false;
 
-		down_read(&current->mm->mmap_sem);
-		if (npages == -EHWPOISON ||
-			(!async && check_user_page_hwpoison(addr))) {
-			up_read(&current->mm->mmap_sem);
-			get_page(hwpoison_page);
-			return page_to_pfn(hwpoison_page);
-		}
+	return true;
+}
 
-		vma = find_vma_intersection(current->mm, addr, addr+1);
-
-		if (vma == NULL)
-			pfn = get_fault_pfn();
-		else if ((vma->vm_flags & VM_PFNMAP)) {
-			pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
-				vma->vm_pgoff;
-			BUG_ON(!kvm_is_mmio_pfn(pfn));
-		} else {
-			if (async && (vma->vm_flags & VM_WRITE))
-				*async = true;
-			pfn = get_fault_pfn();
-		}
-		up_read(&current->mm->mmap_sem);
-	} else
-		pfn = page_to_pfn(page[0]);
+/*
+ * Pin guest page in memory and return its pfn.
+ * @addr: host virtual address which maps memory to the guest
+ * @atomic: whether this function can sleep
+ * @async: whether this function need to wait IO complete if the
+ *         host page is not in the memory
+ * @write_fault: whether we should get a writable host page
+ * @writable: whether it allows to map a writable host page for !@write_fault
+ *
+ * The function will map a writable host page for these two cases:
+ * 1): @write_fault = true
+ * 2): @write_fault = false && @writable, @writable will tell the caller
+ *     whether the mapping is writable.
+ */
+static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
+			bool write_fault, bool *writable)
+{
+	struct vm_area_struct *vma;
+	pfn_t pfn = 0;
+	int npages;
 
+	/* we can do it either atomically or asynchronously, not both */
+	BUG_ON(atomic && async);
+
+	if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
+		return pfn;
+
+	if (atomic)
+		return KVM_PFN_ERR_FAULT;
+
+	npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
+	if (npages == 1)
+		return pfn;
+
+	down_read(&current->mm->mmap_sem);
+	if (npages == -EHWPOISON ||
+	      (!async && check_user_page_hwpoison(addr))) {
+		pfn = KVM_PFN_ERR_HWPOISON;
+		goto exit;
+	}
+
+	vma = find_vma_intersection(current->mm, addr, addr + 1);
+
+	if (vma == NULL)
+		pfn = KVM_PFN_ERR_FAULT;
+	else if ((vma->vm_flags & VM_PFNMAP)) {
+		pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
+			vma->vm_pgoff;
+		BUG_ON(!kvm_is_mmio_pfn(pfn));
+	} else {
+		if (async && vma_is_valid(vma, write_fault))
+			*async = true;
+		pfn = KVM_PFN_ERR_FAULT;
+	}
+exit:
+	up_read(&current->mm->mmap_sem);
 	return pfn;
 }
 
-pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
+static pfn_t
+__gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
+		     bool *async, bool write_fault, bool *writable)
 {
-	return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
+	unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
+
+	if (addr == KVM_HVA_ERR_RO_BAD)
+		return KVM_PFN_ERR_RO_FAULT;
+
+	if (kvm_is_error_hva(addr))
+		return KVM_PFN_NOSLOT;
+
+	/* Do not map writable pfn in the readonly memslot. */
+	if (writable && memslot_is_readonly(slot)) {
+		*writable = false;
+		writable = NULL;
+	}
+
+	return hva_to_pfn(addr, atomic, async, write_fault,
+			  writable);
 }
-EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
 
 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
 			  bool write_fault, bool *writable)
 {
-	unsigned long addr;
+	struct kvm_memory_slot *slot;
 
 	if (async)
 		*async = false;
 
-	addr = gfn_to_hva(kvm, gfn);
-	if (kvm_is_error_hva(addr)) {
-		get_page(bad_page);
-		return page_to_pfn(bad_page);
-	}
+	slot = gfn_to_memslot(kvm, gfn);
 
-	return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
+	return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault,
+				    writable);
 }
 
 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
@@ -1253,13 +1322,17 @@ pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
 }
 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
 
-pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
-			 struct kvm_memory_slot *slot, gfn_t gfn)
+pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 {
-	unsigned long addr = gfn_to_hva_memslot(slot, gfn);
-	return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
+	return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
 }
 
+pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+	return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
+}
+EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
+
 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 								  int nr_pages)
 {
@@ -1277,53 +1350,58 @@ int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
 }
 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
 
+static struct page *kvm_pfn_to_page(pfn_t pfn)
+{
+	if (is_error_noslot_pfn(pfn))
+		return KVM_ERR_PTR_BAD_PAGE;
+
+	if (kvm_is_mmio_pfn(pfn)) {
+		WARN_ON(1);
+		return KVM_ERR_PTR_BAD_PAGE;
+	}
+
+	return pfn_to_page(pfn);
+}
+
 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 {
 	pfn_t pfn;
 
 	pfn = gfn_to_pfn(kvm, gfn);
-	if (!kvm_is_mmio_pfn(pfn))
-		return pfn_to_page(pfn);
 
-	WARN_ON(kvm_is_mmio_pfn(pfn));
-
-	get_page(bad_page);
-	return bad_page;
+	return kvm_pfn_to_page(pfn);
 }
 
 EXPORT_SYMBOL_GPL(gfn_to_page);
 
 void kvm_release_page_clean(struct page *page)
 {
+	WARN_ON(is_error_page(page));
+
 	kvm_release_pfn_clean(page_to_pfn(page));
 }
 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
 
 void kvm_release_pfn_clean(pfn_t pfn)
 {
-	if (!kvm_is_mmio_pfn(pfn))
+	if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
 		put_page(pfn_to_page(pfn));
 }
 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
 
 void kvm_release_page_dirty(struct page *page)
 {
+	WARN_ON(is_error_page(page));
+
 	kvm_release_pfn_dirty(page_to_pfn(page));
 }
 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
 
-void kvm_release_pfn_dirty(pfn_t pfn)
+static void kvm_release_pfn_dirty(pfn_t pfn)
 {
 	kvm_set_pfn_dirty(pfn);
 	kvm_release_pfn_clean(pfn);
 }
-EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
-
-void kvm_set_page_dirty(struct page *page)
-{
-	kvm_set_pfn_dirty(page_to_pfn(page));
-}
-EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
 
 void kvm_set_pfn_dirty(pfn_t pfn)
 {
@@ -1363,10 +1441,10 @@ int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 	int r;
 	unsigned long addr;
 
-	addr = gfn_to_hva(kvm, gfn);
+	addr = gfn_to_hva_prot(kvm, gfn, NULL);
 	if (kvm_is_error_hva(addr))
 		return -EFAULT;
-	r = __copy_from_user(data, (void __user *)addr + offset, len);
+	r = kvm_read_hva(data, (void __user *)addr + offset, len);
 	if (r)
 		return -EFAULT;
 	return 0;
@@ -1401,11 +1479,11 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 	gfn_t gfn = gpa >> PAGE_SHIFT;
 	int offset = offset_in_page(gpa);
 
-	addr = gfn_to_hva(kvm, gfn);
+	addr = gfn_to_hva_prot(kvm, gfn, NULL);
 	if (kvm_is_error_hva(addr))
 		return -EFAULT;
 	pagefault_disable();
-	r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
+	r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
 	pagefault_enable();
 	if (r)
 		return -EFAULT;
@@ -1451,21 +1529,38 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 }
 
 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
-			      gpa_t gpa)
+			      gpa_t gpa, unsigned long len)
 {
 	struct kvm_memslots *slots = kvm_memslots(kvm);
 	int offset = offset_in_page(gpa);
-	gfn_t gfn = gpa >> PAGE_SHIFT;
+	gfn_t start_gfn = gpa >> PAGE_SHIFT;
+	gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
+	gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
+	gfn_t nr_pages_avail;
 
 	ghc->gpa = gpa;
 	ghc->generation = slots->generation;
-	ghc->memslot = __gfn_to_memslot(slots, gfn);
-	ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
-	if (!kvm_is_error_hva(ghc->hva))
+	ghc->len = len;
+	ghc->memslot = gfn_to_memslot(kvm, start_gfn);
+	ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail);
+	if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) {
 		ghc->hva += offset;
-	else
-		return -EFAULT;
-
+	} else {
+		/*
+		 * If the requested region crosses two memslots, we still
+		 * verify that the entire region is valid here.
+		 */
+		while (start_gfn <= end_gfn) {
+			ghc->memslot = gfn_to_memslot(kvm, start_gfn);
+			ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
+						   &nr_pages_avail);
+			if (kvm_is_error_hva(ghc->hva))
+				return -EFAULT;
+			start_gfn += nr_pages_avail;
+		}
+		/* Use the slow path for cross page reads and writes. */
+		ghc->memslot = NULL;
+	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
@@ -1476,8 +1571,13 @@ int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 	struct kvm_memslots *slots = kvm_memslots(kvm);
 	int r;
 
+	BUG_ON(len > ghc->len);
+
 	if (slots->generation != ghc->generation)
-		kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
+		kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
+
+	if (unlikely(!ghc->memslot))
+		return kvm_write_guest(kvm, ghc->gpa, data, len);
 
 	if (kvm_is_error_hva(ghc->hva))
 		return -EFAULT;
@@ -1497,8 +1597,13 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
 	struct kvm_memslots *slots = kvm_memslots(kvm);
 	int r;
 
+	BUG_ON(len > ghc->len);
+
 	if (slots->generation != ghc->generation)
-		kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
+		kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
+
+	if (unlikely(!ghc->memslot))
+		return kvm_read_guest(kvm, ghc->gpa, data, len);
 
 	if (kvm_is_error_hva(ghc->hva))
 		return -EFAULT;
@@ -1513,8 +1618,9 @@ EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
 
 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 {
-	return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
-				    offset, len);
+	const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
+
+	return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
 }
 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
 
@@ -1537,14 +1643,14 @@ int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
 }
 EXPORT_SYMBOL_GPL(kvm_clear_guest);
 
-void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
-			     gfn_t gfn)
+static void mark_page_dirty_in_slot(struct kvm *kvm,
+				    struct kvm_memory_slot *memslot,
+				    gfn_t gfn)
 {
 	if (memslot && memslot->dirty_bitmap) {
 		unsigned long rel_gfn = gfn - memslot->base_gfn;
 
-		if (!test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap))
-			memslot->nr_dirty_pages++;
+		set_bit_le(rel_gfn, memslot->dirty_bitmap);
 	}
 }
 
@@ -1555,6 +1661,7 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 	memslot = gfn_to_memslot(kvm, gfn);
 	mark_page_dirty_in_slot(kvm, memslot, gfn);
 }
+EXPORT_SYMBOL_GPL(mark_page_dirty);
 
 /*
  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
@@ -1580,14 +1687,96 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 
 	finish_wait(&vcpu->wq, &wait);
 }
+EXPORT_SYMBOL_GPL(kvm_vcpu_block);
 
-void kvm_resched(struct kvm_vcpu *vcpu)
+#ifndef CONFIG_S390
+/*
+ * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
+ */
+void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
 {
-	if (!need_resched())
-		return;
-	cond_resched();
+	int me;
+	int cpu = vcpu->cpu;
+	wait_queue_head_t *wqp;
+
+	wqp = kvm_arch_vcpu_wq(vcpu);
+	if (waitqueue_active(wqp)) {
+		wake_up_interruptible(wqp);
+		++vcpu->stat.halt_wakeup;
+	}
+
+	me = get_cpu();
+	if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
+		if (kvm_arch_vcpu_should_kick(vcpu))
+			smp_send_reschedule(cpu);
+	put_cpu();
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
+#endif /* !CONFIG_S390 */
+
+int kvm_vcpu_yield_to(struct kvm_vcpu *target)
+{
+	struct pid *pid;
+	struct task_struct *task = NULL;
+	int ret = 0;
+
+	rcu_read_lock();
+	pid = rcu_dereference(target->pid);
+	if (pid)
+		task = get_pid_task(target->pid, PIDTYPE_PID);
+	rcu_read_unlock();
+	if (!task)
+		return ret;
+	if (task->flags & PF_VCPU) {
+		put_task_struct(task);
+		return ret;
+	}
+	ret = yield_to(task, 1);
+	put_task_struct(task);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
+
+/*
+ * Helper that checks whether a VCPU is eligible for directed yield.
+ * Most eligible candidate to yield is decided by following heuristics:
+ *
+ *  (a) VCPU which has not done pl-exit or cpu relax intercepted recently
+ *  (preempted lock holder), indicated by @in_spin_loop.
+ *  Set at the beiginning and cleared at the end of interception/PLE handler.
+ *
+ *  (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
+ *  chance last time (mostly it has become eligible now since we have probably
+ *  yielded to lockholder in last iteration. This is done by toggling
+ *  @dy_eligible each time a VCPU checked for eligibility.)
+ *
+ *  Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
+ *  to preempted lock-holder could result in wrong VCPU selection and CPU
+ *  burning. Giving priority for a potential lock-holder increases lock
+ *  progress.
+ *
+ *  Since algorithm is based on heuristics, accessing another VCPU data without
+ *  locking does not harm. It may result in trying to yield to  same VCPU, fail
+ *  and continue with next VCPU and so on.
+ */
+static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
+{
+#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
+	bool eligible;
+
+	eligible = !vcpu->spin_loop.in_spin_loop ||
+			(vcpu->spin_loop.in_spin_loop &&
+			 vcpu->spin_loop.dy_eligible);
+
+	if (vcpu->spin_loop.in_spin_loop)
+		kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
+
+	return eligible;
+#else
+	return true;
+#endif
 }
-EXPORT_SYMBOL_GPL(kvm_resched);
 
 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
 {
@@ -1595,9 +1784,11 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
 	struct kvm_vcpu *vcpu;
 	int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
 	int yielded = 0;
+	int try = 3;
 	int pass;
 	int i;
 
+	kvm_vcpu_set_in_spin_loop(me, true);
 	/*
 	 * We boost the priority of a VCPU that is runnable but not
 	 * currently running, because it got preempted by something
@@ -1605,39 +1796,37 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
 	 * VCPU is holding the lock that we need and will release it.
 	 * We approximate round-robin by starting at the last boosted VCPU.
 	 */
-	for (pass = 0; pass < 2 && !yielded; pass++) {
+	for (pass = 0; pass < 2 && !yielded && try; pass++) {
 		kvm_for_each_vcpu(i, vcpu, kvm) {
-			struct task_struct *task = NULL;
-			struct pid *pid;
-			if (!pass && i < last_boosted_vcpu) {
+			if (!pass && i <= last_boosted_vcpu) {
 				i = last_boosted_vcpu;
 				continue;
 			} else if (pass && i > last_boosted_vcpu)
 				break;
-			if (vcpu == me)
+			if (!ACCESS_ONCE(vcpu->preempted))
 				continue;
-			if (waitqueue_active(&vcpu->wq))
+			if (vcpu == me)
 				continue;
-			rcu_read_lock();
-			pid = rcu_dereference(vcpu->pid);
-			if (pid)
-				task = get_pid_task(vcpu->pid, PIDTYPE_PID);
-			rcu_read_unlock();
-			if (!task)
+			if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
 				continue;
-			if (task->flags & PF_VCPU) {
-				put_task_struct(task);
+			if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
 				continue;
-			}
-			if (yield_to(task, 1)) {
-				put_task_struct(task);
+
+			yielded = kvm_vcpu_yield_to(vcpu);
+			if (yielded > 0) {
 				kvm->last_boosted_vcpu = i;
-				yielded = 1;
 				break;
+			} else if (yielded < 0) {
+				try--;
+				if (!try)
+					break;
 			}
-			put_task_struct(task);
 		}
 	}
+	kvm_vcpu_set_in_spin_loop(me, false);
+
+	/* Ensure vcpu is not eligible during next spinloop */
+	kvm_vcpu_set_dy_eligible(me, false);
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
 
@@ -1657,7 +1846,7 @@ static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
 #endif
 	else
-		return VM_FAULT_SIGBUS;
+		return kvm_arch_vcpu_fault(vcpu, vmf);
 	get_page(page);
 	vmf->page = page;
 	return 0;
@@ -1696,7 +1885,7 @@ static struct file_operations kvm_vcpu_fops = {
  */
 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 {
-	return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
+	return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
 }
 
 /*
@@ -1707,6 +1896,9 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	int r;
 	struct kvm_vcpu *vcpu, *v;
 
+	if (id >= KVM_MAX_VCPUS)
+		return -EINVAL;
+
 	vcpu = kvm_arch_vcpu_create(kvm, id);
 	if (IS_ERR(vcpu))
 		return PTR_ERR(vcpu);
@@ -1718,6 +1910,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 		goto vcpu_destroy;
 
 	mutex_lock(&kvm->lock);
+	if (!kvm_vcpu_compatible(vcpu)) {
+		r = -EINVAL;
+		goto unlock_vcpu_destroy;
+	}
 	if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
 		r = -EINVAL;
 		goto unlock_vcpu_destroy;
@@ -1744,6 +1940,7 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
 	atomic_inc(&kvm->online_vcpus);
 
 	mutex_unlock(&kvm->lock);
+	kvm_arch_vcpu_postcreate(vcpu);
 	return r;
 
 unlock_vcpu_destroy:
@@ -1776,7 +1973,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
 	if (vcpu->kvm->mm != current->mm)
 		return -EIO;
 
-#if defined(CONFIG_S390) || defined(CONFIG_PPC)
+#if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
 	/*
 	 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
 	 * so vcpu_load() would break it.
@@ -1786,7 +1983,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
 #endif
 
 
-	vcpu_load(vcpu);
+	r = vcpu_load(vcpu);
+	if (r)
+		return r;
 	switch (ioctl) {
 	case KVM_RUN:
 		r = -EINVAL;
@@ -1823,10 +2022,6 @@ out_free1:
 			goto out;
 		}
 		r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
-		if (r)
-			goto out_free2;
-		r = 0;
-out_free2:
 		kfree(kvm_regs);
 		break;
 	}
@@ -1848,12 +2043,10 @@ out_free2:
 		kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
 		if (IS_ERR(kvm_sregs)) {
 			r = PTR_ERR(kvm_sregs);
+			kvm_sregs = NULL;
 			goto out;
 		}
 		r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 	case KVM_GET_MP_STATE: {
@@ -1875,9 +2068,6 @@ out_free2:
 		if (copy_from_user(&mp_state, argp, sizeof mp_state))
 			goto out;
 		r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 	case KVM_TRANSLATE: {
@@ -1902,9 +2092,6 @@ out_free2:
 		if (copy_from_user(&dbg, argp, sizeof dbg))
 			goto out;
 		r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 	case KVM_SET_SIGNAL_MASK: {
@@ -1948,12 +2135,10 @@ out_free2:
 		fpu = memdup_user(argp, sizeof(*fpu));
 		if (IS_ERR(fpu)) {
 			r = PTR_ERR(fpu);
+			fpu = NULL;
 			goto out;
 		}
 		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 	default:
@@ -1996,9 +2181,10 @@ static long kvm_vcpu_compat_ioctl(struct file *filp,
 			if (copy_from_user(&csigset, sigmask_arg->sigset,
 					   sizeof csigset))
 				goto out;
-		}
-		sigset_from_compat(&sigset, &csigset);
-		r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
+			sigset_from_compat(&sigset, &csigset);
+			r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
+		} else
+			r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
 		break;
 	}
 	default:
@@ -2010,6 +2196,134 @@ out:
 }
 #endif
 
+static int kvm_device_ioctl_attr(struct kvm_device *dev,
+				 int (*accessor)(struct kvm_device *dev,
+						 struct kvm_device_attr *attr),
+				 unsigned long arg)
+{
+	struct kvm_device_attr attr;
+
+	if (!accessor)
+		return -EPERM;
+
+	if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
+		return -EFAULT;
+
+	return accessor(dev, &attr);
+}
+
+static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
+			     unsigned long arg)
+{
+	struct kvm_device *dev = filp->private_data;
+
+	switch (ioctl) {
+	case KVM_SET_DEVICE_ATTR:
+		return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
+	case KVM_GET_DEVICE_ATTR:
+		return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
+	case KVM_HAS_DEVICE_ATTR:
+		return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
+	default:
+		if (dev->ops->ioctl)
+			return dev->ops->ioctl(dev, ioctl, arg);
+
+		return -ENOTTY;
+	}
+}
+
+static int kvm_device_release(struct inode *inode, struct file *filp)
+{
+	struct kvm_device *dev = filp->private_data;
+	struct kvm *kvm = dev->kvm;
+
+	kvm_put_kvm(kvm);
+	return 0;
+}
+
+static const struct file_operations kvm_device_fops = {
+	.unlocked_ioctl = kvm_device_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = kvm_device_ioctl,
+#endif
+	.release = kvm_device_release,
+};
+
+struct kvm_device *kvm_device_from_filp(struct file *filp)
+{
+	if (filp->f_op != &kvm_device_fops)
+		return NULL;
+
+	return filp->private_data;
+}
+
+static int kvm_ioctl_create_device(struct kvm *kvm,
+				   struct kvm_create_device *cd)
+{
+	struct kvm_device_ops *ops = NULL;
+	struct kvm_device *dev;
+	bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
+	int ret;
+
+	switch (cd->type) {
+#ifdef CONFIG_KVM_MPIC
+	case KVM_DEV_TYPE_FSL_MPIC_20:
+	case KVM_DEV_TYPE_FSL_MPIC_42:
+		ops = &kvm_mpic_ops;
+		break;
+#endif
+#ifdef CONFIG_KVM_XICS
+	case KVM_DEV_TYPE_XICS:
+		ops = &kvm_xics_ops;
+		break;
+#endif
+#ifdef CONFIG_KVM_VFIO
+	case KVM_DEV_TYPE_VFIO:
+		ops = &kvm_vfio_ops;
+		break;
+#endif
+#ifdef CONFIG_KVM_ARM_VGIC
+	case KVM_DEV_TYPE_ARM_VGIC_V2:
+		ops = &kvm_arm_vgic_v2_ops;
+		break;
+#endif
+#ifdef CONFIG_S390
+	case KVM_DEV_TYPE_FLIC:
+		ops = &kvm_flic_ops;
+		break;
+#endif
+	default:
+		return -ENODEV;
+	}
+
+	if (test)
+		return 0;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->ops = ops;
+	dev->kvm = kvm;
+
+	ret = ops->create(dev, cd->type);
+	if (ret < 0) {
+		kfree(dev);
+		return ret;
+	}
+
+	ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
+	if (ret < 0) {
+		ops->destroy(dev);
+		return ret;
+	}
+
+	list_add(&dev->vm_node, &kvm->devices);
+	kvm_get_kvm(kvm);
+	cd->fd = ret;
+	return 0;
+}
+
 static long kvm_vm_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
@@ -2022,8 +2336,6 @@ static long kvm_vm_ioctl(struct file *filp,
 	switch (ioctl) {
 	case KVM_CREATE_VCPU:
 		r = kvm_vm_ioctl_create_vcpu(kvm, arg);
-		if (r < 0)
-			goto out;
 		break;
 	case KVM_SET_USER_MEMORY_REGION: {
 		struct kvm_userspace_memory_region kvm_userspace_mem;
@@ -2033,9 +2345,7 @@ static long kvm_vm_ioctl(struct file *filp,
 						sizeof kvm_userspace_mem))
 			goto out;
 
-		r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
-		if (r)
-			goto out;
+		r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
 		break;
 	}
 	case KVM_GET_DIRTY_LOG: {
@@ -2045,8 +2355,6 @@ static long kvm_vm_ioctl(struct file *filp,
 		if (copy_from_user(&log, argp, sizeof log))
 			goto out;
 		r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
-		if (r)
-			goto out;
 		break;
 	}
 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
@@ -2056,9 +2364,6 @@ static long kvm_vm_ioctl(struct file *filp,
 		if (copy_from_user(&zone, argp, sizeof zone))
 			goto out;
 		r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 	case KVM_UNREGISTER_COALESCED_MMIO: {
@@ -2067,9 +2372,6 @@ static long kvm_vm_ioctl(struct file *filp,
 		if (copy_from_user(&zone, argp, sizeof zone))
 			goto out;
 		r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
-		if (r)
-			goto out;
-		r = 0;
 		break;
 	}
 #endif
@@ -2079,7 +2381,7 @@ static long kvm_vm_ioctl(struct file *filp,
 		r = -EFAULT;
 		if (copy_from_user(&data, argp, sizeof data))
 			goto out;
-		r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
+		r = kvm_irqfd(kvm, &data);
 		break;
 	}
 	case KVM_IOEVENTFD: {
@@ -2102,6 +2404,89 @@ static long kvm_vm_ioctl(struct file *filp,
 		mutex_unlock(&kvm->lock);
 		break;
 #endif
+#ifdef CONFIG_HAVE_KVM_MSI
+	case KVM_SIGNAL_MSI: {
+		struct kvm_msi msi;
+
+		r = -EFAULT;
+		if (copy_from_user(&msi, argp, sizeof msi))
+			goto out;
+		r = kvm_send_userspace_msi(kvm, &msi);
+		break;
+	}
+#endif
+#ifdef __KVM_HAVE_IRQ_LINE
+	case KVM_IRQ_LINE_STATUS:
+	case KVM_IRQ_LINE: {
+		struct kvm_irq_level irq_event;
+
+		r = -EFAULT;
+		if (copy_from_user(&irq_event, argp, sizeof irq_event))
+			goto out;
+
+		r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
+					ioctl == KVM_IRQ_LINE_STATUS);
+		if (r)
+			goto out;
+
+		r = -EFAULT;
+		if (ioctl == KVM_IRQ_LINE_STATUS) {
+			if (copy_to_user(argp, &irq_event, sizeof irq_event))
+				goto out;
+		}
+
+		r = 0;
+		break;
+	}
+#endif
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
+	case KVM_SET_GSI_ROUTING: {
+		struct kvm_irq_routing routing;
+		struct kvm_irq_routing __user *urouting;
+		struct kvm_irq_routing_entry *entries;
+
+		r = -EFAULT;
+		if (copy_from_user(&routing, argp, sizeof(routing)))
+			goto out;
+		r = -EINVAL;
+		if (routing.nr >= KVM_MAX_IRQ_ROUTES)
+			goto out;
+		if (routing.flags)
+			goto out;
+		r = -ENOMEM;
+		entries = vmalloc(routing.nr * sizeof(*entries));
+		if (!entries)
+			goto out;
+		r = -EFAULT;
+		urouting = argp;
+		if (copy_from_user(entries, urouting->entries,
+				   routing.nr * sizeof(*entries)))
+			goto out_free_irq_routing;
+		r = kvm_set_irq_routing(kvm, entries, routing.nr,
+					routing.flags);
+	out_free_irq_routing:
+		vfree(entries);
+		break;
+	}
+#endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
+	case KVM_CREATE_DEVICE: {
+		struct kvm_create_device cd;
+
+		r = -EFAULT;
+		if (copy_from_user(&cd, argp, sizeof(cd)))
+			goto out;
+
+		r = kvm_ioctl_create_device(kvm, &cd);
+		if (r)
+			goto out;
+
+		r = -EFAULT;
+		if (copy_to_user(argp, &cd, sizeof(cd)))
+			goto out;
+
+		r = 0;
+		break;
+	}
 	default:
 		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
 		if (r == -ENOTTY)
@@ -2144,8 +2529,6 @@ static long kvm_vm_compat_ioctl(struct file *filp,
 		log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
 
 		r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
-		if (r)
-			goto out;
 		break;
 	}
 	default:
@@ -2157,53 +2540,21 @@ out:
 }
 #endif
 
-static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-	struct page *page[1];
-	unsigned long addr;
-	int npages;
-	gfn_t gfn = vmf->pgoff;
-	struct kvm *kvm = vma->vm_file->private_data;
-
-	addr = gfn_to_hva(kvm, gfn);
-	if (kvm_is_error_hva(addr))
-		return VM_FAULT_SIGBUS;
-
-	npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
-				NULL);
-	if (unlikely(npages != 1))
-		return VM_FAULT_SIGBUS;
-
-	vmf->page = page[0];
-	return 0;
-}
-
-static const struct vm_operations_struct kvm_vm_vm_ops = {
-	.fault = kvm_vm_fault,
-};
-
-static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	vma->vm_ops = &kvm_vm_vm_ops;
-	return 0;
-}
-
 static struct file_operations kvm_vm_fops = {
 	.release        = kvm_vm_release,
 	.unlocked_ioctl = kvm_vm_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = kvm_vm_compat_ioctl,
 #endif
-	.mmap           = kvm_vm_mmap,
 	.llseek		= noop_llseek,
 };
 
-static int kvm_dev_ioctl_create_vm(void)
+static int kvm_dev_ioctl_create_vm(unsigned long type)
 {
 	int r;
 	struct kvm *kvm;
 
-	kvm = kvm_create_vm();
+	kvm = kvm_create_vm(type);
 	if (IS_ERR(kvm))
 		return PTR_ERR(kvm);
 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
@@ -2213,7 +2564,7 @@ static int kvm_dev_ioctl_create_vm(void)
 		return r;
 	}
 #endif
-	r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
+	r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
 	if (r < 0)
 		kvm_put_kvm(kvm);
 
@@ -2230,8 +2581,14 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
 	case KVM_CAP_SET_BOOT_CPU_ID:
 #endif
 	case KVM_CAP_INTERNAL_ERROR_DATA:
+#ifdef CONFIG_HAVE_KVM_MSI
+	case KVM_CAP_SIGNAL_MSI:
+#endif
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
+	case KVM_CAP_IRQFD_RESAMPLE:
+#endif
 		return 1;
-#ifdef CONFIG_HAVE_KVM_IRQCHIP
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
 	case KVM_CAP_IRQ_ROUTING:
 		return KVM_MAX_IRQ_ROUTES;
 #endif
@@ -2254,10 +2611,7 @@ static long kvm_dev_ioctl(struct file *filp,
 		r = KVM_API_VERSION;
 		break;
 	case KVM_CREATE_VM:
-		r = -EINVAL;
-		if (arg)
-			goto out;
-		r = kvm_dev_ioctl_create_vm();
+		r = kvm_dev_ioctl_create_vm(arg);
 		break;
 	case KVM_CHECK_EXTENSION:
 		r = kvm_dev_ioctl_check_extension_generic(arg);
@@ -2318,11 +2672,12 @@ static void hardware_enable_nolock(void *junk)
 	}
 }
 
-static void hardware_enable(void *junk)
+static void hardware_enable(void)
 {
-	raw_spin_lock(&kvm_lock);
-	hardware_enable_nolock(junk);
-	raw_spin_unlock(&kvm_lock);
+	raw_spin_lock(&kvm_count_lock);
+	if (kvm_usage_count)
+		hardware_enable_nolock(NULL);
+	raw_spin_unlock(&kvm_count_lock);
 }
 
 static void hardware_disable_nolock(void *junk)
@@ -2335,11 +2690,12 @@ static void hardware_disable_nolock(void *junk)
 	kvm_arch_hardware_disable(NULL);
 }
 
-static void hardware_disable(void *junk)
+static void hardware_disable(void)
 {
-	raw_spin_lock(&kvm_lock);
-	hardware_disable_nolock(junk);
-	raw_spin_unlock(&kvm_lock);
+	raw_spin_lock(&kvm_count_lock);
+	if (kvm_usage_count)
+		hardware_disable_nolock(NULL);
+	raw_spin_unlock(&kvm_count_lock);
 }
 
 static void hardware_disable_all_nolock(void)
@@ -2353,16 +2709,16 @@ static void hardware_disable_all_nolock(void)
 
 static void hardware_disable_all(void)
 {
-	raw_spin_lock(&kvm_lock);
+	raw_spin_lock(&kvm_count_lock);
 	hardware_disable_all_nolock();
-	raw_spin_unlock(&kvm_lock);
+	raw_spin_unlock(&kvm_count_lock);
 }
 
 static int hardware_enable_all(void)
 {
 	int r = 0;
 
-	raw_spin_lock(&kvm_lock);
+	raw_spin_lock(&kvm_count_lock);
 
 	kvm_usage_count++;
 	if (kvm_usage_count == 1) {
@@ -2375,7 +2731,7 @@ static int hardware_enable_all(void)
 		}
 	}
 
-	raw_spin_unlock(&kvm_lock);
+	raw_spin_unlock(&kvm_count_lock);
 
 	return r;
 }
@@ -2385,33 +2741,22 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
 {
 	int cpu = (long)v;
 
-	if (!kvm_usage_count)
-		return NOTIFY_OK;
-
 	val &= ~CPU_TASKS_FROZEN;
 	switch (val) {
 	case CPU_DYING:
 		printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
 		       cpu);
-		hardware_disable(NULL);
+		hardware_disable();
 		break;
 	case CPU_STARTING:
 		printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
 		       cpu);
-		hardware_enable(NULL);
+		hardware_enable();
 		break;
 	}
 	return NOTIFY_OK;
 }
 
-
-asmlinkage void kvm_spurious_fault(void)
-{
-	/* Fault while not rebooting.  We want the trace. */
-	BUG();
-}
-EXPORT_SYMBOL_GPL(kvm_spurious_fault);
-
 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
 		      void *v)
 {
@@ -2444,11 +2789,9 @@ static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
 	kfree(bus);
 }
 
-int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
+static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
+                                 const struct kvm_io_range *r2)
 {
-	const struct kvm_io_range *r1 = p1;
-	const struct kvm_io_range *r2 = p2;
-
 	if (r1->addr < r2->addr)
 		return -1;
 	if (r1->addr + r1->len > r2->addr + r2->len)
@@ -2456,12 +2799,14 @@ int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
 	return 0;
 }
 
-int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
-			  gpa_t addr, int len)
+static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
 {
-	if (bus->dev_count == NR_IOBUS_DEVS)
-		return -ENOSPC;
+	return kvm_io_bus_cmp(p1, p2);
+}
 
+static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
+			  gpa_t addr, int len)
+{
 	bus->range[bus->dev_count++] = (struct kvm_io_range) {
 		.addr = addr,
 		.len = len,
@@ -2474,7 +2819,7 @@ int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
 	return 0;
 }
 
-int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
+static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
 			     gpa_t addr, int len)
 {
 	struct kvm_io_range *range, key;
@@ -2492,17 +2837,54 @@ int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
 
 	off = range - bus->range;
 
-	while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
+	while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
 		off--;
 
 	return off;
 }
 
+static int __kvm_io_bus_write(struct kvm_io_bus *bus,
+			      struct kvm_io_range *range, const void *val)
+{
+	int idx;
+
+	idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
+	if (idx < 0)
+		return -EOPNOTSUPP;
+
+	while (idx < bus->dev_count &&
+		kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
+		if (!kvm_iodevice_write(bus->range[idx].dev, range->addr,
+					range->len, val))
+			return idx;
+		idx++;
+	}
+
+	return -EOPNOTSUPP;
+}
+
 /* kvm_io_bus_write - called under kvm->slots_lock */
 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 		     int len, const void *val)
 {
-	int idx;
+	struct kvm_io_bus *bus;
+	struct kvm_io_range range;
+	int r;
+
+	range = (struct kvm_io_range) {
+		.addr = addr,
+		.len = len,
+	};
+
+	bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
+	r = __kvm_io_bus_write(bus, &range, val);
+	return r < 0 ? r : 0;
+}
+
+/* kvm_io_bus_write_cookie - called under kvm->slots_lock */
+int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
+			    int len, const void *val, long cookie)
+{
 	struct kvm_io_bus *bus;
 	struct kvm_io_range range;
 
@@ -2512,27 +2894,49 @@ int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 	};
 
 	bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
-	idx = kvm_io_bus_get_first_dev(bus, addr, len);
+
+	/* First try the device referenced by cookie. */
+	if ((cookie >= 0) && (cookie < bus->dev_count) &&
+	    (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
+		if (!kvm_iodevice_write(bus->range[cookie].dev, addr, len,
+					val))
+			return cookie;
+
+	/*
+	 * cookie contained garbage; fall back to search and return the
+	 * correct cookie value.
+	 */
+	return __kvm_io_bus_write(bus, &range, val);
+}
+
+static int __kvm_io_bus_read(struct kvm_io_bus *bus, struct kvm_io_range *range,
+			     void *val)
+{
+	int idx;
+
+	idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
 	if (idx < 0)
 		return -EOPNOTSUPP;
 
 	while (idx < bus->dev_count &&
-		kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
-		if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
-			return 0;
+		kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
+		if (!kvm_iodevice_read(bus->range[idx].dev, range->addr,
+				       range->len, val))
+			return idx;
 		idx++;
 	}
 
 	return -EOPNOTSUPP;
 }
+EXPORT_SYMBOL_GPL(kvm_io_bus_write);
 
 /* kvm_io_bus_read - called under kvm->slots_lock */
 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 		    int len, void *val)
 {
-	int idx;
 	struct kvm_io_bus *bus;
 	struct kvm_io_range range;
+	int r;
 
 	range = (struct kvm_io_range) {
 		.addr = addr,
@@ -2540,20 +2944,11 @@ int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 	};
 
 	bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
-	idx = kvm_io_bus_get_first_dev(bus, addr, len);
-	if (idx < 0)
-		return -EOPNOTSUPP;
-
-	while (idx < bus->dev_count &&
-		kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
-		if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
-			return 0;
-		idx++;
-	}
-
-	return -EOPNOTSUPP;
+	r = __kvm_io_bus_read(bus, &range, val);
+	return r < 0 ? r : 0;
 }
 
+
 /* Caller must hold slots_lock. */
 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 			    int len, struct kvm_io_device *dev)
@@ -2561,12 +2956,16 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
 	struct kvm_io_bus *new_bus, *bus;
 
 	bus = kvm->buses[bus_idx];
-	if (bus->dev_count > NR_IOBUS_DEVS-1)
+	/* exclude ioeventfd which is limited by maximum fd */
+	if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
 		return -ENOSPC;
 
-	new_bus = kmemdup(bus, sizeof(struct kvm_io_bus), GFP_KERNEL);
+	new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
+			  sizeof(struct kvm_io_range)), GFP_KERNEL);
 	if (!new_bus)
 		return -ENOMEM;
+	memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
+	       sizeof(struct kvm_io_range)));
 	kvm_io_bus_insert_dev(new_bus, dev, addr, len);
 	rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
 	synchronize_srcu_expedited(&kvm->srcu);
@@ -2583,27 +2982,25 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
 	struct kvm_io_bus *new_bus, *bus;
 
 	bus = kvm->buses[bus_idx];
-
-	new_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL);
-	if (!new_bus)
-		return -ENOMEM;
-
 	r = -ENOENT;
-	for (i = 0; i < new_bus->dev_count; i++)
-		if (new_bus->range[i].dev == dev) {
+	for (i = 0; i < bus->dev_count; i++)
+		if (bus->range[i].dev == dev) {
 			r = 0;
-			new_bus->dev_count--;
-			new_bus->range[i] = new_bus->range[new_bus->dev_count];
-			sort(new_bus->range, new_bus->dev_count,
-			     sizeof(struct kvm_io_range),
-			     kvm_io_bus_sort_cmp, NULL);
 			break;
 		}
 
-	if (r) {
-		kfree(new_bus);
+	if (r)
 		return r;
-	}
+
+	new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
+			  sizeof(struct kvm_io_range)), GFP_KERNEL);
+	if (!new_bus)
+		return -ENOMEM;
+
+	memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
+	new_bus->dev_count--;
+	memcpy(new_bus->range + i, bus->range + i + 1,
+	       (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
 
 	rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
 	synchronize_srcu_expedited(&kvm->srcu);
@@ -2621,10 +3018,10 @@ static int vm_stat_get(void *_offset, u64 *val)
 	struct kvm *kvm;
 
 	*val = 0;
-	raw_spin_lock(&kvm_lock);
+	spin_lock(&kvm_lock);
 	list_for_each_entry(kvm, &vm_list, vm_list)
 		*val += *(u32 *)((void *)kvm + offset);
-	raw_spin_unlock(&kvm_lock);
+	spin_unlock(&kvm_lock);
 	return 0;
 }
 
@@ -2638,12 +3035,12 @@ static int vcpu_stat_get(void *_offset, u64 *val)
 	int i;
 
 	*val = 0;
-	raw_spin_lock(&kvm_lock);
+	spin_lock(&kvm_lock);
 	list_for_each_entry(kvm, &vm_list, vm_list)
 		kvm_for_each_vcpu(i, vcpu, kvm)
 			*val += *(u32 *)((void *)vcpu + offset);
 
-	raw_spin_unlock(&kvm_lock);
+	spin_unlock(&kvm_lock);
 	return 0;
 }
 
@@ -2656,7 +3053,7 @@ static const struct file_operations *stat_fops[] = {
 
 static int kvm_init_debug(void)
 {
-	int r = -EFAULT;
+	int r = -EEXIST;
 	struct kvm_stats_debugfs_item *p;
 
 	kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
@@ -2698,7 +3095,7 @@ static int kvm_suspend(void)
 static void kvm_resume(void)
 {
 	if (kvm_usage_count) {
-		WARN_ON(raw_spin_is_locked(&kvm_lock));
+		WARN_ON(raw_spin_is_locked(&kvm_count_lock));
 		hardware_enable_nolock(NULL);
 	}
 }
@@ -2708,9 +3105,6 @@ static struct syscore_ops kvm_syscore_ops = {
 	.resume = kvm_resume,
 };
 
-struct page *bad_page;
-pfn_t bad_pfn;
-
 static inline
 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
 {
@@ -2720,6 +3114,8 @@ struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
 {
 	struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
+	if (vcpu->preempted)
+		vcpu->preempted = false;
 
 	kvm_arch_vcpu_load(vcpu, cpu);
 }
@@ -2729,6 +3125,8 @@ static void kvm_sched_out(struct preempt_notifier *pn,
 {
 	struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
 
+	if (current->state == TASK_RUNNING)
+		vcpu->preempted = true;
 	kvm_arch_vcpu_put(vcpu);
 }
 
@@ -2742,32 +3140,16 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 	if (r)
 		goto out_fail;
 
-	bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-
-	if (bad_page == NULL) {
-		r = -ENOMEM;
-		goto out;
-	}
-
-	bad_pfn = page_to_pfn(bad_page);
-
-	hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-
-	if (hwpoison_page == NULL) {
-		r = -ENOMEM;
-		goto out_free_0;
-	}
-
-	hwpoison_pfn = page_to_pfn(hwpoison_page);
-
-	fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
-
-	if (fault_page == NULL) {
-		r = -ENOMEM;
-		goto out_free_0;
-	}
-
-	fault_pfn = page_to_pfn(fault_page);
+	/*
+	 * kvm_arch_init makes sure there's at most one caller
+	 * for architectures that support multiple implementations,
+	 * like intel and amd on x86.
+	 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
+	 * conflicts in case kvm is already setup for another implementation.
+	 */
+	r = kvm_irqfd_init();
+	if (r)
+		goto out_irqfd;
 
 	if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
 		r = -ENOMEM;
@@ -2830,6 +3212,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
 
 out_undebugfs:
 	unregister_syscore_ops(&kvm_syscore_ops);
+	misc_deregister(&kvm_dev);
 out_unreg:
 	kvm_async_pf_deinit();
 out_free:
@@ -2843,12 +3226,8 @@ out_free_1:
 out_free_0a:
 	free_cpumask_var(cpus_hardware_enabled);
 out_free_0:
-	if (fault_page)
-		__free_page(fault_page);
-	if (hwpoison_page)
-		__free_page(hwpoison_page);
-	__free_page(bad_page);
-out:
+	kvm_irqfd_exit();
+out_irqfd:
 	kvm_arch_exit();
 out_fail:
 	return r;
@@ -2867,8 +3246,7 @@ void kvm_exit(void)
 	on_each_cpu(hardware_disable_nolock, NULL, 1);
 	kvm_arch_hardware_unsetup();
 	kvm_arch_exit();
+	kvm_irqfd_exit();
 	free_cpumask_var(cpus_hardware_enabled);
-	__free_page(hwpoison_page);
-	__free_page(bad_page);
 }
 EXPORT_SYMBOL_GPL(kvm_exit);
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
new file mode 100644
index 00000000000..ba1a93f935c
--- /dev/null
+++ b/virt/kvm/vfio.c
@@ -0,0 +1,277 @@
+/*
+ * VFIO-KVM bridge pseudo device
+ *
+ * Copyright (C) 2013 Red Hat, Inc.  All rights reserved.
+ *     Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/kvm_host.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+
+struct kvm_vfio_group {
+	struct list_head node;
+	struct vfio_group *vfio_group;
+};
+
+struct kvm_vfio {
+	struct list_head group_list;
+	struct mutex lock;
+	bool noncoherent;
+};
+
+static struct vfio_group *kvm_vfio_group_get_external_user(struct file *filep)
+{
+	struct vfio_group *vfio_group;
+	struct vfio_group *(*fn)(struct file *);
+
+	fn = symbol_get(vfio_group_get_external_user);
+	if (!fn)
+		return ERR_PTR(-EINVAL);
+
+	vfio_group = fn(filep);
+
+	symbol_put(vfio_group_get_external_user);
+
+	return vfio_group;
+}
+
+static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
+{
+	void (*fn)(struct vfio_group *);
+
+	fn = symbol_get(vfio_group_put_external_user);
+	if (!fn)
+		return;
+
+	fn(vfio_group);
+
+	symbol_put(vfio_group_put_external_user);
+}
+
+static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
+{
+	long (*fn)(struct vfio_group *, unsigned long);
+	long ret;
+
+	fn = symbol_get(vfio_external_check_extension);
+	if (!fn)
+		return false;
+
+	ret = fn(vfio_group, VFIO_DMA_CC_IOMMU);
+
+	symbol_put(vfio_external_check_extension);
+
+	return ret > 0;
+}
+
+/*
+ * Groups can use the same or different IOMMU domains.  If the same then
+ * adding a new group may change the coherency of groups we've previously
+ * been told about.  We don't want to care about any of that so we retest
+ * each group and bail as soon as we find one that's noncoherent.  This
+ * means we only ever [un]register_noncoherent_dma once for the whole device.
+ */
+static void kvm_vfio_update_coherency(struct kvm_device *dev)
+{
+	struct kvm_vfio *kv = dev->private;
+	bool noncoherent = false;
+	struct kvm_vfio_group *kvg;
+
+	mutex_lock(&kv->lock);
+
+	list_for_each_entry(kvg, &kv->group_list, node) {
+		if (!kvm_vfio_group_is_coherent(kvg->vfio_group)) {
+			noncoherent = true;
+			break;
+		}
+	}
+
+	if (noncoherent != kv->noncoherent) {
+		kv->noncoherent = noncoherent;
+
+		if (kv->noncoherent)
+			kvm_arch_register_noncoherent_dma(dev->kvm);
+		else
+			kvm_arch_unregister_noncoherent_dma(dev->kvm);
+	}
+
+	mutex_unlock(&kv->lock);
+}
+
+static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
+{
+	struct kvm_vfio *kv = dev->private;
+	struct vfio_group *vfio_group;
+	struct kvm_vfio_group *kvg;
+	int32_t __user *argp = (int32_t __user *)(unsigned long)arg;
+	struct fd f;
+	int32_t fd;
+	int ret;
+
+	switch (attr) {
+	case KVM_DEV_VFIO_GROUP_ADD:
+		if (get_user(fd, argp))
+			return -EFAULT;
+
+		f = fdget(fd);
+		if (!f.file)
+			return -EBADF;
+
+		vfio_group = kvm_vfio_group_get_external_user(f.file);
+		fdput(f);
+
+		if (IS_ERR(vfio_group))
+			return PTR_ERR(vfio_group);
+
+		mutex_lock(&kv->lock);
+
+		list_for_each_entry(kvg, &kv->group_list, node) {
+			if (kvg->vfio_group == vfio_group) {
+				mutex_unlock(&kv->lock);
+				kvm_vfio_group_put_external_user(vfio_group);
+				return -EEXIST;
+			}
+		}
+
+		kvg = kzalloc(sizeof(*kvg), GFP_KERNEL);
+		if (!kvg) {
+			mutex_unlock(&kv->lock);
+			kvm_vfio_group_put_external_user(vfio_group);
+			return -ENOMEM;
+		}
+
+		list_add_tail(&kvg->node, &kv->group_list);
+		kvg->vfio_group = vfio_group;
+
+		mutex_unlock(&kv->lock);
+
+		kvm_vfio_update_coherency(dev);
+
+		return 0;
+
+	case KVM_DEV_VFIO_GROUP_DEL:
+		if (get_user(fd, argp))
+			return -EFAULT;
+
+		f = fdget(fd);
+		if (!f.file)
+			return -EBADF;
+
+		vfio_group = kvm_vfio_group_get_external_user(f.file);
+		fdput(f);
+
+		if (IS_ERR(vfio_group))
+			return PTR_ERR(vfio_group);
+
+		ret = -ENOENT;
+
+		mutex_lock(&kv->lock);
+
+		list_for_each_entry(kvg, &kv->group_list, node) {
+			if (kvg->vfio_group != vfio_group)
+				continue;
+
+			list_del(&kvg->node);
+			kvm_vfio_group_put_external_user(kvg->vfio_group);
+			kfree(kvg);
+			ret = 0;
+			break;
+		}
+
+		mutex_unlock(&kv->lock);
+
+		kvm_vfio_group_put_external_user(vfio_group);
+
+		kvm_vfio_update_coherency(dev);
+
+		return ret;
+	}
+
+	return -ENXIO;
+}
+
+static int kvm_vfio_set_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_VFIO_GROUP:
+		return kvm_vfio_set_group(dev, attr->attr, attr->addr);
+	}
+
+	return -ENXIO;
+}
+
+static int kvm_vfio_has_attr(struct kvm_device *dev,
+			     struct kvm_device_attr *attr)
+{
+	switch (attr->group) {
+	case KVM_DEV_VFIO_GROUP:
+		switch (attr->attr) {
+		case KVM_DEV_VFIO_GROUP_ADD:
+		case KVM_DEV_VFIO_GROUP_DEL:
+			return 0;
+		}
+
+		break;
+	}
+
+	return -ENXIO;
+}
+
+static void kvm_vfio_destroy(struct kvm_device *dev)
+{
+	struct kvm_vfio *kv = dev->private;
+	struct kvm_vfio_group *kvg, *tmp;
+
+	list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) {
+		kvm_vfio_group_put_external_user(kvg->vfio_group);
+		list_del(&kvg->node);
+		kfree(kvg);
+	}
+
+	kvm_vfio_update_coherency(dev);
+
+	kfree(kv);
+	kfree(dev); /* alloc by kvm_ioctl_create_device, free by .destroy */
+}
+
+static int kvm_vfio_create(struct kvm_device *dev, u32 type)
+{
+	struct kvm_device *tmp;
+	struct kvm_vfio *kv;
+
+	/* Only one VFIO "device" per VM */
+	list_for_each_entry(tmp, &dev->kvm->devices, vm_node)
+		if (tmp->ops == &kvm_vfio_ops)
+			return -EBUSY;
+
+	kv = kzalloc(sizeof(*kv), GFP_KERNEL);
+	if (!kv)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&kv->group_list);
+	mutex_init(&kv->lock);
+
+	dev->private = kv;
+
+	return 0;
+}
+
+struct kvm_device_ops kvm_vfio_ops = {
+	.name = "kvm-vfio",
+	.create = kvm_vfio_create,
+	.destroy = kvm_vfio_destroy,
+	.set_attr = kvm_vfio_set_attr,
+	.has_attr = kvm_vfio_has_attr,
+};