path: root/arch/powerpc/kvm/booke.c

/*
 * 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, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>

#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>
#include "timing.h"
#include <asm/cacheflush.h>

#include "booke.h"

unsigned long kvmppc_booke_handlers;

#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "mmio",       VCPU_STAT(mmio_exits) },
	{ "dcr",        VCPU_STAT(dcr_exits) },
	{ "sig",        VCPU_STAT(signal_exits) },
	{ "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
	{ "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
	{ "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
	{ "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
	{ "sysc",       VCPU_STAT(syscall_exits) },
	{ "isi",        VCPU_STAT(isi_exits) },
	{ "dsi",        VCPU_STAT(dsi_exits) },
	{ "inst_emu",   VCPU_STAT(emulated_inst_exits) },
	{ "dec",        VCPU_STAT(dec_exits) },
	{ "ext_intr",   VCPU_STAT(ext_intr_exits) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
	{ NULL }
};

/* TODO: use vcpu_printf() */
void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
{
	int i;

	printk("pc:   %08lx msr:  %08llx\n", vcpu->arch.pc, vcpu->arch.shared->msr);
	printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
	printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0,
					    vcpu->arch.shared->srr1);

	printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);

	for (i = 0; i < 32; i += 4) {
		printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
		       kvmppc_get_gpr(vcpu, i),
		       kvmppc_get_gpr(vcpu, i+1),
		       kvmppc_get_gpr(vcpu, i+2),
		       kvmppc_get_gpr(vcpu, i+3));
	}
}

#ifdef CONFIG_SPE
void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	enable_kernel_spe();
	kvmppc_save_guest_spe(vcpu);
	vcpu->arch.shadow_msr &= ~MSR_SPE;
	preempt_enable();
}

static void kvmppc_vcpu_enable_spe(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	enable_kernel_spe();
	kvmppc_load_guest_spe(vcpu);
	vcpu->arch.shadow_msr |= MSR_SPE;
	preempt_enable();
}

static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.shared->msr & MSR_SPE) {
		if (!(vcpu->arch.shadow_msr & MSR_SPE))
			kvmppc_vcpu_enable_spe(vcpu);
	} else if (vcpu->arch.shadow_msr & MSR_SPE) {
		kvmppc_vcpu_disable_spe(vcpu);
	}
}
#else
static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
}
#endif

/*
 * Helper function for "full" MSR writes.  No need to call this if only
 * EE/CE/ME/DE/RI are changing.
 */
void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
{
	u32 old_msr = vcpu->arch.shared->msr;

	vcpu->arch.shared->msr = new_msr;

	kvmppc_mmu_msr_notify(vcpu, old_msr);

	if (vcpu->arch.shared->msr & MSR_WE) {
		kvm_vcpu_block(vcpu);
		kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
	};

	kvmppc_vcpu_sync_spe(vcpu);
}

static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
                                       unsigned int priority)
{
	set_bit(priority, &vcpu->arch.pending_exceptions);
}

static void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
                                        ulong dear_flags, ulong esr_flags)
{
	vcpu->arch.queued_dear = dear_flags;
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
}

static void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
                                           ulong dear_flags, ulong esr_flags)
{
	vcpu->arch.queued_dear = dear_flags;
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
}

static void