/* * Copyright (C) 2001 MandrakeSoft S.A. * Copyright 2010 Red Hat, Inc. and/or its affiliates. * * MandrakeSoft S.A. * 43, rue d'Aboukir * 75002 Paris - France * http://www.linux-mandrake.com/ * http://www.mandrakesoft.com/ * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Yunhong Jiang <yunhong.jiang@intel.com> * Yaozu (Eddie) Dong <eddie.dong@intel.com> * Based on Xen 3.1 code. */ #include <linux/kvm_host.h> #include <linux/kvm.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/smp.h> #include <linux/hrtimer.h> #include <linux/io.h> #include <linux/slab.h> #include <asm/processor.h> #include <asm/page.h> #include <asm/current.h> #include <trace/events/kvm.h> #include "ioapic.h" #include "lapic.h" #include "irq.h" #if 0 #define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg) #else #define ioapic_debug(fmt, arg...) #endif static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq); static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, unsigned long addr, unsigned long length) { unsigned long result = 0; switch (ioapic->ioregsel) { case IOAPIC_REG_VERSION: result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16) | (IOAPIC_VERSION_ID & 0xff)); break; case IOAPIC_REG_APIC_ID: case IOAPIC_REG_ARB_ID: result = ((ioapic->id & 0xf) << 24); break; default: { u32 redir_index = (ioapic->ioregsel - 0x10) >> 1; u64 redir_content; ASSERT(redir_index < IOAPIC_NUM_PINS); redir_content = ioapic->redirtbl[redir_index].bits; result = (ioapic->ioregsel & 0x1) ? (redir_content >> 32) & 0xffffffff : redir_content & 0xffffffff; break; } } return result; } static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx) { union kvm_ioapic_redirect_entry *pent; int injected = -1; pent = &ioapic->redirtbl[idx]; if (!pent->fields.mask) { injected = ioapic_deliver(ioapic, idx); if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG) pent->fields.remote_irr = 1; } return injected; } static void update_handled_vectors(struct kvm_ioapic *ioapic) { DECLARE_BITMAP(handled_vectors, 256); int i; memset(handled_vectors, 0, sizeof(handled_vectors)); for (i = 0; i < IOAPIC_NUM_PINS; ++i) __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors); memcpy(ioapic->handled_vectors, handled_vectors, sizeof(handled_vectors)); smp_wmb(); } static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) { unsigned index; bool mask_before, mask_after; union kvm_ioapic_redirect_entry *e; switch (ioapic->ioregsel) { case IOAPIC_REG_VERSION: /* Writes are ignored. */ break; case IOAPIC_REG_APIC_ID: ioapic->id = (val >> 24) & 0xf; break; case IOAPIC_REG_ARB_ID: break; default: index = (ioapic->ioregsel - 0x10) >> 1; ioapic_debug("change redir index %x val %x\n", index, val); if (index >= IOAPIC_NUM_PINS) return; e = &ioapic->redirtbl[index]; mask_before = e->fields.mask; if (ioapic->ioregsel & 1) { e->bits &= 0xffffffff; e->bits |= (u64) val << 32; } else { e->bits &= ~0xffffffffULL; e->bits |= (u32) val; e->fields.remote_irr = 0; } update_handled_vectors(ioapic); mask_after = e->fields.mask; if (mask_before != mask_after) 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); break; } } static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) { union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq]; struct kvm_lapic_irq irqe; ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x " "vector=%x trig_mode=%x\n", entry->fields.dest_id, entry->fields.dest_mode, entry->fields.delivery_mode, entry->fields.vector, entry->fields.trig_mode); irqe.dest_id = entry->fields.dest_id; irqe.vector = entry->fields.vector; irqe.dest_mode = entry->fields.dest_mode; irqe.trig_mode = entry->fields.trig_mode; irqe.delivery_mode = entry->fields.delivery_mode << 8; 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->vcpu_id; } #endif return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe); } int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level) { u32 old_irr; u32 mask = 1 << irq; union kvm_ioapic_redirect_entry entry; int ret = 1; 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); } spin_unlock(&ioapic->lock); return ret; } static void __kvm_ioapic_update_eoi(struct kvm_ioapic *ioapic, int vector, int trigger_mode) { int i; for (i = 0; i < IOAPIC_NUM_PINS; i++) { union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; if (ent->fields.vector != vector) continue; /* * We are dropping lock while calling ack notifiers because ack * notifier callbacks for assigned devices call into IOAPIC * recursively. Since remote_irr is cleared only after call * to notifiers if the same vector will be delivered while lock * is dropped it will be put into irr and will be delivered * after ack notifier returns. */ spin_unlock(&ioapic->lock); kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i); spin_lock(&ioapic->lock); if (trigger_mode != IOAPIC_LEVEL_TRIG) continue; 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); } } void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode) { struct kvm_ioapic *ioapic = kvm->arch.vioapic; smp_rmb(); if (!test_bit(vector, ioapic->handled_vectors)) return; spin_lock(&ioapic->lock); __kvm_ioapic_update_eoi(ioapic, vector, trigger_mode); spin_unlock(&ioapic->lock); } static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev) { return container_of(dev, struct kvm_ioapic, dev); } static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr) { return ((addr >= ioapic->base_address && (addr < ioapic->base_address + IOAPIC_MEM_LENGTH))); } static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len, void *val) { struct kvm_ioapic *ioapic = to_ioapic(this); u32 result; if (!ioapic_in_range(ioapic, addr)) return -EOPNOTSUPP; ioapic_debug("addr %lx\n", (unsigned long)addr); ASSERT(!(addr & 0xf)); /* check alignment */ addr &= 0xff; spin_lock(&ioapic->lock); switch (addr) { case IOAPIC_REG_SELECT: result = ioapic->ioregsel; break; case IOAPIC_REG_WINDOW: result = ioapic_read_indirect(ioapic, addr, len); break; default: result = 0; break; } spin_unlock(&ioapic->lock); switch (len) { case 8: *(u64 *) val = result; break; case 1: case 2: case 4: memcpy(val, (char *)&result, len); break; default: printk(KERN_WARNING "ioapic: wrong length %d\n", len); } return 0; } static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len, const void *val) { struct kvm_ioapic *ioapic = to_ioapic(this); u32 data; if (!ioapic_in_range(ioapic, addr)) return -EOPNOTSUPP; ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n", (void*)addr, len, val); ASSERT(!(addr & 0xf)); /* check alignment */ if (len == 4 || len == 8) data = *(u32 *) val; else { printk(KERN_WARNING "ioapic: Unsupported size %d\n", len); return 0; } addr &= 0xff; spin_lock(&ioapic->lock); switch (addr) { case IOAPIC_REG_SELECT: ioapic->ioregsel = data; break; case IOAPIC_REG_WINDOW: ioapic_write_indirect(ioapic, data); break; #ifdef CONFIG_IA64 case IOAPIC_REG_EOI: __kvm_ioapic_update_eoi(ioapic, data, IOAPIC_LEVEL_TRIG); break; #endif default: break; } spin_unlock(&ioapic->lock); return 0; } void kvm_ioapic_reset(struct kvm_ioapic *ioapic) { int i; for (i = 0; i < IOAPIC_NUM_PINS; i++) ioapic->redirtbl[i].fields.mask = 1; ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS; ioapic->ioregsel = 0; ioapic->irr = 0; ioapic->id = 0; update_handled_vectors(ioapic); } static const struct kvm_io_device_ops ioapic_mmio_ops = { .read = ioapic_mmio_read, .write = ioapic_mmio_write, }; int kvm_ioapic_init(struct kvm *kvm) { struct kvm_ioapic *ioapic; int ret; ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL); if (!ioapic) return -ENOMEM; spin_lock_init(&ioapic->lock); kvm->arch.vioapic = ioapic; kvm_ioapic_reset(ioapic); kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops); ioapic->kvm = kvm; mutex_lock(&kvm->slots_lock); ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); mutex_unlock(&kvm->slots_lock); if (ret < 0) { kvm->arch.vioapic = NULL; kfree(ioapic); } return ret; } void kvm_ioapic_destroy(struct kvm *kvm) { struct kvm_ioapic *ioapic = kvm->arch.vioapic; if (ioapic) { kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev); kvm->arch.vioapic = NULL; kfree(ioapic); } } int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) { struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); if (!ioapic) return -EINVAL; spin_lock(&ioapic->lock); memcpy(state, ioapic, sizeof(struct kvm_ioapic_state)); spin_unlock(&ioapic->lock); return 0; } int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state) { struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); if (!ioapic) return -EINVAL; spin_lock(&ioapic->lock); memcpy(ioapic, state, sizeof(struct kvm_ioapic_state)); update_handled_vectors(ioapic); spin_unlock(&ioapic->lock); return 0; }