x86.c 102.2 KB
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/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * derived from drivers/kvm/kvm_main.c
 *
 * Copyright (C) 2006 Qumranet, Inc.
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 * Copyright (C) 2008 Qumranet, Inc.
 * Copyright IBM Corporation, 2008
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 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@qumranet.com>
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 *   Amit Shah    <amit.shah@qumranet.com>
 *   Ben-Ami Yassour <benami@il.ibm.com>
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 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

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#include <linux/kvm_host.h>
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#include "irq.h"
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#include "mmu.h"
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#include "i8254.h"
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#include "tss.h"
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include <linux/clocksource.h>
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#include <linux/interrupt.h>
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#include <linux/kvm.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/mman.h>
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#include <linux/highmem.h>
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#include <linux/iommu.h>
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#include <linux/intel-iommu.h>
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#include <asm/uaccess.h>
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#include <asm/msr.h>
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#include <asm/desc.h>
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#include <asm/mtrr.h>
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#define MAX_IO_MSRS 256
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#define CR0_RESERVED_BITS						\
	(~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
			  | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
			  | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
#define CR4_RESERVED_BITS						\
	(~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
			  | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE	\
			  | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR	\
			  | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))

#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
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/* EFER defaults:
 * - enable syscall per default because its emulated by KVM
 * - enable LME and LMA per default on 64 bit KVM
 */
#ifdef CONFIG_X86_64
static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
#else
static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
#endif
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#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
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static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
				    struct kvm_cpuid_entry2 __user *entries);

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struct kvm_x86_ops *kvm_x86_ops;
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EXPORT_SYMBOL_GPL(kvm_x86_ops);
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struct kvm_stats_debugfs_item debugfs_entries[] = {
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	{ "pf_fixed", VCPU_STAT(pf_fixed) },
	{ "pf_guest", VCPU_STAT(pf_guest) },
	{ "tlb_flush", VCPU_STAT(tlb_flush) },
	{ "invlpg", VCPU_STAT(invlpg) },
	{ "exits", VCPU_STAT(exits) },
	{ "io_exits", VCPU_STAT(io_exits) },
	{ "mmio_exits", VCPU_STAT(mmio_exits) },
	{ "signal_exits", VCPU_STAT(signal_exits) },
	{ "irq_window", VCPU_STAT(irq_window_exits) },
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	{ "nmi_window", VCPU_STAT(nmi_window_exits) },
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	{ "halt_exits", VCPU_STAT(halt_exits) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
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	{ "hypercalls", VCPU_STAT(hypercalls) },
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	{ "request_irq", VCPU_STAT(request_irq_exits) },
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	{ "request_nmi", VCPU_STAT(request_nmi_exits) },
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	{ "irq_exits", VCPU_STAT(irq_exits) },
	{ "host_state_reload", VCPU_STAT(host_state_reload) },
	{ "efer_reload", VCPU_STAT(efer_reload) },
	{ "fpu_reload", VCPU_STAT(fpu_reload) },
	{ "insn_emulation", VCPU_STAT(insn_emulation) },
	{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
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	{ "irq_injections", VCPU_STAT(irq_injections) },
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	{ "nmi_injections", VCPU_STAT(nmi_injections) },
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	{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
	{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
	{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
	{ "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
	{ "mmu_flooded", VM_STAT(mmu_flooded) },
	{ "mmu_recycled", VM_STAT(mmu_recycled) },
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	{ "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
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	{ "mmu_unsync", VM_STAT(mmu_unsync) },
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	{ "mmu_unsync_global", VM_STAT(mmu_unsync_global) },
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	{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
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	{ "largepages", VM_STAT(lpages) },
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	{ NULL }
};

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unsigned long segment_base(u16 selector)
{
	struct descriptor_table gdt;
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	struct desc_struct *d;
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	unsigned long table_base;
	unsigned long v;

	if (selector == 0)
		return 0;

	asm("sgdt %0" : "=m"(gdt));
	table_base = gdt.base;

	if (selector & 4) {           /* from ldt */
		u16 ldt_selector;

		asm("sldt %0" : "=g"(ldt_selector));
		table_base = segment_base(ldt_selector);
	}
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	d = (struct desc_struct *)(table_base + (selector & ~7));
	v = d->base0 | ((unsigned long)d->base1 << 16) |
		((unsigned long)d->base2 << 24);
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#ifdef CONFIG_X86_64
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	if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
		v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
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#endif
	return v;
}
EXPORT_SYMBOL_GPL(segment_base);

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u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
{
	if (irqchip_in_kernel(vcpu->kvm))
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		return vcpu->arch.apic_base;
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	else
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		return vcpu->arch.apic_base;
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}
EXPORT_SYMBOL_GPL(kvm_get_apic_base);

void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
{
	/* TODO: reserve bits check */
	if (irqchip_in_kernel(vcpu->kvm))
		kvm_lapic_set_base(vcpu, data);
	else
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		vcpu->arch.apic_base = data;
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}
EXPORT_SYMBOL_GPL(kvm_set_apic_base);

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void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
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	WARN_ON(vcpu->arch.exception.pending);
	vcpu->arch.exception.pending = true;
	vcpu->arch.exception.has_error_code = false;
	vcpu->arch.exception.nr = nr;
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}
EXPORT_SYMBOL_GPL(kvm_queue_exception);

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void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
			   u32 error_code)
{
	++vcpu->stat.pf_guest;
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	if (vcpu->arch.exception.pending) {
		if (vcpu->arch.exception.nr == PF_VECTOR) {
			printk(KERN_DEBUG "kvm: inject_page_fault:"
					" double fault 0x%lx\n", addr);
			vcpu->arch.exception.nr = DF_VECTOR;
			vcpu->arch.exception.error_code = 0;
		} else if (vcpu->arch.exception.nr == DF_VECTOR) {
			/* triple fault -> shutdown */
			set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
		}
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		return;
	}
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	vcpu->arch.cr2 = addr;
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	kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
}

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void kvm_inject_nmi(struct kvm_vcpu *vcpu)
{
	vcpu->arch.nmi_pending = 1;
}
EXPORT_SYMBOL_GPL(kvm_inject_nmi);

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void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
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	WARN_ON(vcpu->arch.exception.pending);
	vcpu->arch.exception.pending = true;
	vcpu->arch.exception.has_error_code = true;
	vcpu->arch.exception.nr = nr;
	vcpu->arch.exception.error_code = error_code;
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}
EXPORT_SYMBOL_GPL(kvm_queue_exception_e);

static void __queue_exception(struct kvm_vcpu *vcpu)
{
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	kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
				     vcpu->arch.exception.has_error_code,
				     vcpu->arch.exception.error_code);
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}

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/*
 * Load the pae pdptrs.  Return true is they are all valid.
 */
int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
{
	gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
	unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
	int i;
	int ret;
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	u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
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	ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
				  offset * sizeof(u64), sizeof(pdpte));
	if (ret < 0) {
		ret = 0;
		goto out;
	}
	for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
		if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
			ret = 0;
			goto out;
		}
	}
	ret = 1;

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	memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
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out:

	return ret;
}
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EXPORT_SYMBOL_GPL(load_pdptrs);
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static bool pdptrs_changed(struct kvm_vcpu *vcpu)
{
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	u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
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	bool changed = true;
	int r;

	if (is_long_mode(vcpu) || !is_pae(vcpu))
		return false;

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	r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
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	if (r < 0)
		goto out;
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	changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
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out:

	return changed;
}

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void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
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{
	if (cr0 & CR0_RESERVED_BITS) {
		printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
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		       cr0, vcpu->arch.cr0);
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
		printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
		printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
		       "and a clear PE flag\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
#ifdef CONFIG_X86_64
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		if ((vcpu->arch.shadow_efer & EFER_LME)) {
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			int cs_db, cs_l;

			if (!is_pae(vcpu)) {
				printk(KERN_DEBUG "set_cr0: #GP, start paging "
				       "in long mode while PAE is disabled\n");
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				kvm_inject_gp(vcpu, 0);
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				return;
			}
			kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
			if (cs_l) {
				printk(KERN_DEBUG "set_cr0: #GP, start paging "
				       "in long mode while CS.L == 1\n");
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				kvm_inject_gp(vcpu, 0);
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				return;

			}
		} else
#endif
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		if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
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			printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
			       "reserved bits\n");
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			kvm_inject_gp(vcpu, 0);
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			return;
		}

	}

	kvm_x86_ops->set_cr0(vcpu, cr0);
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	vcpu->arch.cr0 = cr0;
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	kvm_mmu_sync_global(vcpu);
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	kvm_mmu_reset_context(vcpu);
	return;
}
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EXPORT_SYMBOL_GPL(kvm_set_cr0);
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void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
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{
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	kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
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	KVMTRACE_1D(LMSW, vcpu,
		    (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
		    handler);
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}
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EXPORT_SYMBOL_GPL(kvm_lmsw);
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void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
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{
	if (cr4 & CR4_RESERVED_BITS) {
		printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if (is_long_mode(vcpu)) {
		if (!(cr4 & X86_CR4_PAE)) {
			printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
			       "in long mode\n");
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			kvm_inject_gp(vcpu, 0);
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			return;
		}
	} else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
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		   && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
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		printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if (cr4 & X86_CR4_VMXE) {
		printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}
	kvm_x86_ops->set_cr4(vcpu, cr4);
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	vcpu->arch.cr4 = cr4;
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	kvm_mmu_sync_global(vcpu);
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	kvm_mmu_reset_context(vcpu);
}
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EXPORT_SYMBOL_GPL(kvm_set_cr4);
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void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
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{
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	if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
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		kvm_mmu_sync_roots(vcpu);
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		kvm_mmu_flush_tlb(vcpu);
		return;
	}

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	if (is_long_mode(vcpu)) {
		if (cr3 & CR3_L_MODE_RESERVED_BITS) {
			printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
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			kvm_inject_gp(vcpu, 0);
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			return;
		}
	} else {
		if (is_pae(vcpu)) {
			if (cr3 & CR3_PAE_RESERVED_BITS) {
				printk(KERN_DEBUG
				       "set_cr3: #GP, reserved bits\n");
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				kvm_inject_gp(vcpu, 0);
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				return;
			}
			if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
				printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
				       "reserved bits\n");
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				kvm_inject_gp(vcpu, 0);
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				return;
			}
		}
		/*
		 * We don't check reserved bits in nonpae mode, because
		 * this isn't enforced, and VMware depends on this.
		 */
	}

	/*
	 * Does the new cr3 value map to physical memory? (Note, we
	 * catch an invalid cr3 even in real-mode, because it would
	 * cause trouble later on when we turn on paging anyway.)
	 *
	 * A real CPU would silently accept an invalid cr3 and would
	 * attempt to use it - with largely undefined (and often hard
	 * to debug) behavior on the guest side.
	 */
	if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
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		kvm_inject_gp(vcpu, 0);
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	else {
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		vcpu->arch.cr3 = cr3;
		vcpu->arch.mmu.new_cr3(vcpu);
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	}
}
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EXPORT_SYMBOL_GPL(kvm_set_cr3);
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void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
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{
	if (cr8 & CR8_RESERVED_BITS) {
		printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
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		kvm_inject_gp(vcpu, 0);
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		return;
	}
	if (irqchip_in_kernel(vcpu->kvm))
		kvm_lapic_set_tpr(vcpu, cr8);
	else
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		vcpu->arch.cr8 = cr8;
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}
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EXPORT_SYMBOL_GPL(kvm_set_cr8);
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unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
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{
	if (irqchip_in_kernel(vcpu->kvm))
		return kvm_lapic_get_cr8(vcpu);
	else
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		return vcpu->arch.cr8;
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}
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EXPORT_SYMBOL_GPL(kvm_get_cr8);
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/*
 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 *
 * This list is modified at module load time to reflect the
 * capabilities of the host cpu.
 */
static u32 msrs_to_save[] = {
	MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
	MSR_K6_STAR,
#ifdef CONFIG_X86_64
	MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
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	MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
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	MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT
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};

static unsigned num_msrs_to_save;

static u32 emulated_msrs[] = {
	MSR_IA32_MISC_ENABLE,
};

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static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
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	if (efer & efer_reserved_bits) {
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		printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
		       efer);
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	if (is_paging(vcpu)
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	    && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
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		printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
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		kvm_inject_gp(vcpu, 0);
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		return;
	}

	kvm_x86_ops->set_efer(vcpu, efer);

	efer &= ~EFER_LMA;
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	efer |= vcpu->arch.shadow_efer & EFER_LMA;
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	vcpu->arch.shadow_efer = efer;
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}

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void kvm_enable_efer_bits(u64 mask)
{
       efer_reserved_bits &= ~mask;
}
EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);


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/*
 * Writes msr value into into the appropriate "register".
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
	return kvm_x86_ops->set_msr(vcpu, msr_index, data);
}

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/*
 * Adapt set_msr() to msr_io()'s calling convention
 */
static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
{
	return kvm_set_msr(vcpu, index, *data);
}

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static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
{
	static int version;
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	struct pvclock_wall_clock wc;
	struct timespec now, sys, boot;
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	if (!wall_clock)
		return;

	version++;

	kvm_write_guest(kvm, wall_clock, &version, sizeof(version));

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	/*
	 * The guest calculates current wall clock time by adding
	 * system time (updated by kvm_write_guest_time below) to the
	 * wall clock specified here.  guest system time equals host
	 * system time for us, thus we must fill in host boot time here.
	 */
	now = current_kernel_time();
	ktime_get_ts(&sys);
	boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));

	wc.sec = boot.tv_sec;
	wc.nsec = boot.tv_nsec;
	wc.version = version;
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	kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));

	version++;
	kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
}

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static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
{
	uint32_t quotient, remainder;

	/* Don't try to replace with do_div(), this one calculates
	 * "(dividend << 32) / divisor" */
	__asm__ ( "divl %4"
		  : "=a" (quotient), "=d" (remainder)
		  : "0" (0), "1" (dividend), "r" (divisor) );
	return quotient;
}

static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
{
	uint64_t nsecs = 1000000000LL;
	int32_t  shift = 0;
	uint64_t tps64;
	uint32_t tps32;

	tps64 = tsc_khz * 1000LL;
	while (tps64 > nsecs*2) {
		tps64 >>= 1;
		shift--;
	}

	tps32 = (uint32_t)tps64;
	while (tps32 <= (uint32_t)nsecs) {
		tps32 <<= 1;
		shift++;
	}

	hv_clock->tsc_shift = shift;
	hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);

	pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
585
		 __func__, tsc_khz, hv_clock->tsc_shift,
586 587 588
		 hv_clock->tsc_to_system_mul);
}

589 590 591 592 593 594 595 596 597 598
static void kvm_write_guest_time(struct kvm_vcpu *v)
{
	struct timespec ts;
	unsigned long flags;
	struct kvm_vcpu_arch *vcpu = &v->arch;
	void *shared_kaddr;

	if ((!vcpu->time_page))
		return;

599 600 601 602 603
	if (unlikely(vcpu->hv_clock_tsc_khz != tsc_khz)) {
		kvm_set_time_scale(tsc_khz, &vcpu->hv_clock);
		vcpu->hv_clock_tsc_khz = tsc_khz;
	}

604 605 606 607 608 609 610 611 612 613 614 615 616 617
	/* Keep irq disabled to prevent changes to the clock */
	local_irq_save(flags);
	kvm_get_msr(v, MSR_IA32_TIME_STAMP_COUNTER,
			  &vcpu->hv_clock.tsc_timestamp);
	ktime_get_ts(&ts);
	local_irq_restore(flags);

	/* With all the info we got, fill in the values */

	vcpu->hv_clock.system_time = ts.tv_nsec +
				     (NSEC_PER_SEC * (u64)ts.tv_sec);
	/*
	 * The interface expects us to write an even number signaling that the
	 * update is finished. Since the guest won't see the intermediate
618
	 * state, we just increase by 2 at the end.
619
	 */
620
	vcpu->hv_clock.version += 2;
621 622 623 624

	shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);

	memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
625
	       sizeof(vcpu->hv_clock));
626 627 628 629 630 631

	kunmap_atomic(shared_kaddr, KM_USER0);

	mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
}

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static bool msr_mtrr_valid(unsigned msr)
{
	switch (msr) {
	case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
	case MSR_MTRRfix64K_00000:
	case MSR_MTRRfix16K_80000:
	case MSR_MTRRfix16K_A0000:
	case MSR_MTRRfix4K_C0000:
	case MSR_MTRRfix4K_C8000:
	case MSR_MTRRfix4K_D0000:
	case MSR_MTRRfix4K_D8000:
	case MSR_MTRRfix4K_E0000:
	case MSR_MTRRfix4K_E8000:
	case MSR_MTRRfix4K_F0000:
	case MSR_MTRRfix4K_F8000:
	case MSR_MTRRdefType:
	case MSR_IA32_CR_PAT:
		return true;
	case 0x2f8:
		return true;
	}
	return false;
}

static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
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	u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;

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	if (!msr_mtrr_valid(msr))
		return 1;

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	if (msr == MSR_MTRRdefType) {
		vcpu->arch.mtrr_state.def_type = data;
		vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
	} else if (msr == MSR_MTRRfix64K_00000)
		p[0] = data;
	else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
		p[1 + msr - MSR_MTRRfix16K_80000] = data;
	else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
		p[3 + msr - MSR_MTRRfix4K_C0000] = data;
	else if (msr == MSR_IA32_CR_PAT)
		vcpu->arch.pat = data;
	else {	/* Variable MTRRs */
		int idx, is_mtrr_mask;
		u64 *pt;

		idx = (msr - 0x200) / 2;
		is_mtrr_mask = msr - 0x200 - 2 * idx;
		if (!is_mtrr_mask)
			pt =
			  (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
		else
			pt =
			  (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
		*pt = data;
	}

	kvm_mmu_reset_context(vcpu);
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	return 0;
}
692 693 694 695 696 697 698 699 700

int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
	switch (msr) {
	case MSR_EFER:
		set_efer(vcpu, data);
		break;
	case MSR_IA32_MC0_STATUS:
		pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
701
		       __func__, data);
702 703 704
		break;
	case MSR_IA32_MCG_STATUS:
		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
705
			__func__, data);
706
		break;
707 708
	case MSR_IA32_MCG_CTL:
		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
709
			__func__, data);
710
		break;
711 712 713 714 715 716 717 718 719 720 721 722
	case MSR_IA32_DEBUGCTLMSR:
		if (!data) {
			/* We support the non-activated case already */
			break;
		} else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
			/* Values other than LBR and BTF are vendor-specific,
			   thus reserved and should throw a #GP */
			return 1;
		}
		pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
			__func__, data);
		break;
723 724 725
	case MSR_IA32_UCODE_REV:
	case MSR_IA32_UCODE_WRITE:
		break;
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	case 0x200 ... 0x2ff:
		return set_msr_mtrr(vcpu, msr, data);
728 729 730 731
	case MSR_IA32_APICBASE:
		kvm_set_apic_base(vcpu, data);
		break;
	case MSR_IA32_MISC_ENABLE:
732
		vcpu->arch.ia32_misc_enable_msr = data;
733
		break;
734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
	case MSR_KVM_WALL_CLOCK:
		vcpu->kvm->arch.wall_clock = data;
		kvm_write_wall_clock(vcpu->kvm, data);
		break;
	case MSR_KVM_SYSTEM_TIME: {
		if (vcpu->arch.time_page) {
			kvm_release_page_dirty(vcpu->arch.time_page);
			vcpu->arch.time_page = NULL;
		}

		vcpu->arch.time = data;

		/* we verify if the enable bit is set... */
		if (!(data & 1))
			break;

		/* ...but clean it before doing the actual write */
		vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);

		vcpu->arch.time_page =
				gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);

		if (is_error_page(vcpu->arch.time_page)) {
			kvm_release_page_clean(vcpu->arch.time_page);
			vcpu->arch.time_page = NULL;
		}

		kvm_write_guest_time(vcpu);
		break;
	}
764
	default:
765
		pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_msr_common);


/*
 * Reads an msr value (of 'msr_index') into 'pdata'.
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
}

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static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
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785 786
	u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;

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787 788 789
	if (!msr_mtrr_valid(msr))
		return 1;

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790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
	if (msr == MSR_MTRRdefType)
		*pdata = vcpu->arch.mtrr_state.def_type +
			 (vcpu->arch.mtrr_state.enabled << 10);
	else if (msr == MSR_MTRRfix64K_00000)
		*pdata = p[0];
	else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
		*pdata = p[1 + msr - MSR_MTRRfix16K_80000];
	else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
		*pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
	else if (msr == MSR_IA32_CR_PAT)
		*pdata = vcpu->arch.pat;
	else {	/* Variable MTRRs */
		int idx, is_mtrr_mask;
		u64 *pt;

		idx = (msr - 0x200) / 2;
		is_mtrr_mask = msr - 0x200 - 2 * idx;
		if (!is_mtrr_mask)
			pt =
			  (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
		else
			pt =
			  (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
		*pdata = *pt;
	}

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	return 0;
}

819 820 821 822 823 824 825 826 827 828 829 830 831
int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	u64 data;

	switch (msr) {
	case 0xc0010010: /* SYSCFG */
	case 0xc0010015: /* HWCR */
	case MSR_IA32_PLATFORM_ID:
	case MSR_IA32_P5_MC_ADDR:
	case MSR_IA32_P5_MC_TYPE:
	case MSR_IA32_MC0_CTL:
	case MSR_IA32_MCG_STATUS:
	case MSR_IA32_MCG_CAP:
832
	case MSR_IA32_MCG_CTL:
833 834 835 836 837
	case MSR_IA32_MC0_MISC:
	case MSR_IA32_MC0_MISC+4:
	case MSR_IA32_MC0_MISC+8:
	case MSR_IA32_MC0_MISC+12:
	case MSR_IA32_MC0_MISC+16:
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Joerg Roedel 已提交
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	case MSR_IA32_MC0_MISC+20:
839 840
	case MSR_IA32_UCODE_REV:
	case MSR_IA32_EBL_CR_POWERON:
841 842 843 844 845
	case MSR_IA32_DEBUGCTLMSR:
	case MSR_IA32_LASTBRANCHFROMIP:
	case MSR_IA32_LASTBRANCHTOIP:
	case MSR_IA32_LASTINTFROMIP:
	case MSR_IA32_LASTINTTOIP:
846 847
		data = 0;
		break;
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848 849 850 851 852
	case MSR_MTRRcap:
		data = 0x500 | KVM_NR_VAR_MTRR;
		break;
	case 0x200 ... 0x2ff:
		return get_msr_mtrr(vcpu, msr, pdata);
853 854 855 856 857 858 859
	case 0xcd: /* fsb frequency */
		data = 3;
		break;
	case MSR_IA32_APICBASE:
		data = kvm_get_apic_base(vcpu);
		break;
	case MSR_IA32_MISC_ENABLE:
860
		data = vcpu->arch.ia32_misc_enable_msr;
861
		break;
862 863 864 865 866 867
	case MSR_IA32_PERF_STATUS:
		/* TSC increment by tick */
		data = 1000ULL;
		/* CPU multiplier */
		data |= (((uint64_t)4ULL) << 40);
		break;
868
	case MSR_EFER:
869
		data = vcpu->arch.shadow_efer;
870
		break;
871 872 873 874 875 876
	case MSR_KVM_WALL_CLOCK:
		data = vcpu->kvm->arch.wall_clock;
		break;
	case MSR_KVM_SYSTEM_TIME:
		data = vcpu->arch.time;
		break;
877 878 879 880 881 882 883 884 885
	default:
		pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
		return 1;
	}
	*pdata = data;
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_msr_common);

886 887 888 889 890 891 892 893 894 895 896 897 898 899
/*
 * Read or write a bunch of msrs. All parameters are kernel addresses.
 *
 * @return number of msrs set successfully.
 */
static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
		    struct kvm_msr_entry *entries,
		    int (*do_msr)(struct kvm_vcpu *vcpu,
				  unsigned index, u64 *data))
{
	int i;

	vcpu_load(vcpu);

900
	down_read(&vcpu->kvm->slots_lock);
901 902 903
	for (i = 0; i < msrs->nmsrs; ++i)
		if (do_msr(vcpu, entries[i].index, &entries[i].data))
			break;
904
	up_read(&vcpu->kvm->slots_lock);
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959

	vcpu_put(vcpu);

	return i;
}

/*
 * Read or write a bunch of msrs. Parameters are user addresses.
 *
 * @return number of msrs set successfully.
 */
static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
		  int (*do_msr)(struct kvm_vcpu *vcpu,
				unsigned index, u64 *data),
		  int writeback)
{
	struct kvm_msrs msrs;
	struct kvm_msr_entry *entries;
	int r, n;
	unsigned size;

	r = -EFAULT;
	if (copy_from_user(&msrs, user_msrs, sizeof msrs))
		goto out;

	r = -E2BIG;
	if (msrs.nmsrs >= MAX_IO_MSRS)
		goto out;

	r = -ENOMEM;
	size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
	entries = vmalloc(size);
	if (!entries)
		goto out;

	r = -EFAULT;
	if (copy_from_user(entries, user_msrs->entries, size))
		goto out_free;

	r = n = __msr_io(vcpu, &msrs, entries, do_msr);
	if (r < 0)
		goto out_free;

	r = -EFAULT;
	if (writeback && copy_to_user(user_msrs->entries, entries, size))
		goto out_free;

	r = n;

out_free:
	vfree(entries);
out:
	return r;
}

960 961 962 963 964 965 966 967 968
int kvm_dev_ioctl_check_extension(long ext)
{
	int r;

	switch (ext) {
	case KVM_CAP_IRQCHIP:
	case KVM_CAP_HLT:
	case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
	case KVM_CAP_SET_TSS_ADDR:
969
	case KVM_CAP_EXT_CPUID:
970
	case KVM_CAP_CLOCKSOURCE:
S
Sheng Yang 已提交
971
	case KVM_CAP_PIT:
972
	case KVM_CAP_NOP_IO_DELAY:
973
	case KVM_CAP_MP_STATE:
974
	case KVM_CAP_SYNC_MMU:
975 976
		r = 1;
		break;
977 978 979
	case KVM_CAP_COALESCED_MMIO:
		r = KVM_COALESCED_MMIO_PAGE_OFFSET;
		break;
980 981 982
	case KVM_CAP_VAPIC:
		r = !kvm_x86_ops->cpu_has_accelerated_tpr();
		break;
983 984 985
	case KVM_CAP_NR_VCPUS:
		r = KVM_MAX_VCPUS;
		break;
986 987 988
	case KVM_CAP_NR_MEMSLOTS:
		r = KVM_MEMORY_SLOTS;
		break;
989 990 991
	case KVM_CAP_PV_MMU:
		r = !tdp_enabled;
		break;
B
Ben-Ami Yassour 已提交
992
	case KVM_CAP_IOMMU:
J
Joerg Roedel 已提交
993
		r = iommu_found();
B
Ben-Ami Yassour 已提交
994
		break;
995 996 997 998 999 1000 1001 1002
	default:
		r = 0;
		break;
	}
	return r;

}

1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	long r;

	switch (ioctl) {
	case KVM_GET_MSR_INDEX_LIST: {
		struct kvm_msr_list __user *user_msr_list = argp;
		struct kvm_msr_list msr_list;
		unsigned n;

		r = -EFAULT;
		if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
			goto out;
		n = msr_list.nmsrs;
		msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
		if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
			goto out;
		r = -E2BIG;
		if (n < num_msrs_to_save)
			goto out;
		r = -EFAULT;
		if (copy_to_user(user_msr_list->indices, &msrs_to_save,
				 num_msrs_to_save * sizeof(u32)))
			goto out;
		if (copy_to_user(user_msr_list->indices
				 + num_msrs_to_save * sizeof(u32),
				 &emulated_msrs,
				 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
			goto out;
		r = 0;
		break;
	}
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
	case KVM_GET_SUPPORTED_CPUID: {
		struct kvm_cpuid2 __user *cpuid_arg = argp;
		struct kvm_cpuid2 cpuid;

		r = -EFAULT;
		if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
			goto out;
		r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
			cpuid_arg->entries);
		if (r)
			goto out;

		r = -EFAULT;
		if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
			goto out;
		r = 0;
		break;
	}
1055 1056 1057 1058 1059 1060 1061
	default:
		r = -EINVAL;
	}
out:
	return r;
}

1062 1063 1064
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	kvm_x86_ops->vcpu_load(vcpu, cpu);
1065
	kvm_write_guest_time(vcpu);
1066 1067 1068 1069 1070
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	kvm_x86_ops->vcpu_put(vcpu);
1071
	kvm_put_guest_fpu(vcpu);
1072 1073
}

1074
static int is_efer_nx(void)
1075 1076 1077 1078
{
	u64 efer;

	rdmsrl(MSR_EFER, efer);
1079 1080 1081 1082 1083 1084 1085 1086
	return efer & EFER_NX;
}

static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
{
	int i;
	struct kvm_cpuid_entry2 *e, *entry;

1087
	entry = NULL;
1088 1089
	for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
		e = &vcpu->arch.cpuid_entries[i];
1090 1091 1092 1093 1094
		if (e->function == 0x80000001) {
			entry = e;
			break;
		}
	}
1095
	if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1096 1097 1098 1099 1100
		entry->edx &= ~(1 << 20);
		printk(KERN_INFO "kvm: guest NX capability removed\n");
	}
}

1101
/* when an old userspace process fills a new kernel module */
1102 1103 1104
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
				    struct kvm_cpuid *cpuid,
				    struct kvm_cpuid_entry __user *entries)
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
{
	int r, i;
	struct kvm_cpuid_entry *cpuid_entries;

	r = -E2BIG;
	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
		goto out;
	r = -ENOMEM;
	cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
	if (!cpuid_entries)
		goto out;
	r = -EFAULT;
	if (copy_from_user(cpuid_entries, entries,
			   cpuid->nent * sizeof(struct kvm_cpuid_entry)))
		goto out_free;
	for (i = 0; i < cpuid->nent; i++) {
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
		vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
		vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
		vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
		vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
		vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
		vcpu->arch.cpuid_entries[i].index = 0;
		vcpu->arch.cpuid_entries[i].flags = 0;
		vcpu->arch.cpuid_entries[i].padding[0] = 0;
		vcpu->arch.cpuid_entries[i].padding[1] = 0;
		vcpu->arch.cpuid_entries[i].padding[2] = 0;
	}
	vcpu->arch.cpuid_nent = cpuid->nent;
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
	cpuid_fix_nx_cap(vcpu);
	r = 0;

out_free:
	vfree(cpuid_entries);
out:
	return r;
}

static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
				    struct kvm_cpuid2 *cpuid,
				    struct kvm_cpuid_entry2 __user *entries)
1145 1146 1147 1148 1149 1150 1151
{
	int r;

	r = -E2BIG;
	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
		goto out;
	r = -EFAULT;
1152
	if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1153
			   cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1154
		goto out;
1155
	vcpu->arch.cpuid_nent = cpuid->nent;
1156 1157 1158 1159 1160 1161
	return 0;

out:
	return r;
}

1162 1163 1164 1165 1166 1167 1168
static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
				    struct kvm_cpuid2 *cpuid,
				    struct kvm_cpuid_entry2 __user *entries)
{
	int r;

	r = -E2BIG;
1169
	if (cpuid->nent < vcpu->arch.cpuid_nent)
1170 1171
		goto out;
	r = -EFAULT;
1172 1173
	if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
			   vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1174 1175 1176 1177
		goto out;
	return 0;

out:
1178
	cpuid->nent = vcpu->arch.cpuid_nent;
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	return r;
}

static inline u32 bit(int bitno)
{
	return 1 << (bitno & 31);
}

static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
			  u32 index)
{
	entry->function = function;
	entry->index = index;
	cpuid_count(entry->function, entry->index,
		&entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
	entry->flags = 0;
}

static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
			 u32 index, int *nent, int maxnent)
{
	const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
		bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
		bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
		bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
		bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
		bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
		bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
		bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
		bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
		bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
	const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
		bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
		bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
		bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
		bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
		bit(X86_FEATURE_PGE) |
		bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
		bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
		bit(X86_FEATURE_SYSCALL) |
		(bit(X86_FEATURE_NX) && is_efer_nx()) |
#ifdef CONFIG_X86_64
		bit(X86_FEATURE_LM) |
#endif
		bit(X86_FEATURE_MMXEXT) |
		bit(X86_FEATURE_3DNOWEXT) |
		bit(X86_FEATURE_3DNOW);
	const u32 kvm_supported_word3_x86_features =
		bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
	const u32 kvm_supported_word6_x86_features =
		bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);

	/* all func 2 cpuid_count() should be called on the same cpu */
	get_cpu();
	do_cpuid_1_ent(entry, function, index);
	++*nent;

	switch (function) {
	case 0:
		entry->eax = min(entry->eax, (u32)0xb);
		break;
	case 1:
		entry->edx &= kvm_supported_word0_x86_features;
		entry->ecx &= kvm_supported_word3_x86_features;
		break;
	/* function 2 entries are STATEFUL. That is, repeated cpuid commands
	 * may return different values. This forces us to get_cpu() before
	 * issuing the first command, and also to emulate this annoying behavior
	 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
	case 2: {
		int t, times = entry->eax & 0xff;

		entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1252
		entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
1253 1254 1255 1256 1257 1258 1259 1260 1261
		for (t = 1; t < times && *nent < maxnent; ++t) {
			do_cpuid_1_ent(&entry[t], function, 0);
			entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
			++*nent;
		}
		break;
	}
	/* function 4 and 0xb have additional index. */
	case 4: {
1262
		int i, cache_type;
1263 1264 1265

		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
		/* read more entries until cache_type is zero */
1266 1267
		for (i = 1; *nent < maxnent; ++i) {
			cache_type = entry[i - 1].eax & 0x1f;
1268 1269
			if (!cache_type)
				break;
1270 1271
			do_cpuid_1_ent(&entry[i], function, i);
			entry[i].flags |=
1272 1273 1274 1275 1276 1277
			       KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
			++*nent;
		}
		break;
	}
	case 0xb: {
1278
		int i, level_type;
1279 1280 1281

		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
		/* read more entries until level_type is zero */
1282
		for (i = 1; *nent < maxnent; ++i) {
1283
			level_type = entry[i - 1].ecx & 0xff00;
1284 1285
			if (!level_type)
				break;
1286 1287
			do_cpuid_1_ent(&entry[i], function, i);
			entry[i].flags |=
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
			       KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
			++*nent;
		}
		break;
	}
	case 0x80000000:
		entry->eax = min(entry->eax, 0x8000001a);
		break;
	case 0x80000001:
		entry->edx &= kvm_supported_word1_x86_features;
		entry->ecx &= kvm_supported_word6_x86_features;
		break;
	}
	put_cpu();
}

1304
static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
				    struct kvm_cpuid_entry2 __user *entries)
{
	struct kvm_cpuid_entry2 *cpuid_entries;
	int limit, nent = 0, r = -E2BIG;
	u32 func;

	if (cpuid->nent < 1)
		goto out;
	r = -ENOMEM;
	cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
	if (!cpuid_entries)
		goto out;

	do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
	limit = cpuid_entries[0].eax;
	for (func = 1; func <= limit && nent < cpuid->nent; ++func)
		do_cpuid_ent(&cpuid_entries[nent], func, 0,
				&nent, cpuid->nent);
	r = -E2BIG;
	if (nent >= cpuid->nent)
		goto out_free;

	do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
	limit = cpuid_entries[nent - 1].eax;
	for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
		do_cpuid_ent(&cpuid_entries[nent], func, 0,
			       &nent, cpuid->nent);
	r = -EFAULT;
	if (copy_to_user(entries, cpuid_entries,
			nent * sizeof(struct kvm_cpuid_entry2)))
		goto out_free;
	cpuid->nent = nent;
	r = 0;

out_free:
	vfree(cpuid_entries);
out:
	return r;
}

1345 1346 1347 1348
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
				    struct kvm_lapic_state *s)
{
	vcpu_load(vcpu);
1349
	memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1350 1351 1352 1353 1354 1355 1356 1357 1358
	vcpu_put(vcpu);

	return 0;
}

static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
				    struct kvm_lapic_state *s)
{
	vcpu_load(vcpu);
1359
	memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1360 1361 1362 1363 1364 1365
	kvm_apic_post_state_restore(vcpu);
	vcpu_put(vcpu);

	return 0;
}

1366 1367 1368 1369 1370 1371 1372 1373 1374
static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
				    struct kvm_interrupt *irq)
{
	if (irq->irq < 0 || irq->irq >= 256)
		return -EINVAL;
	if (irqchip_in_kernel(vcpu->kvm))
		return -ENXIO;
	vcpu_load(vcpu);

1375 1376
	set_bit(irq->irq, vcpu->arch.irq_pending);
	set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1377 1378 1379 1380 1381 1382

	vcpu_put(vcpu);

	return 0;
}

1383 1384 1385 1386 1387 1388 1389 1390 1391
static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
{
	vcpu_load(vcpu);
	kvm_inject_nmi(vcpu);
	vcpu_put(vcpu);

	return 0;
}

1392 1393 1394 1395 1396 1397 1398 1399 1400
static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
					   struct kvm_tpr_access_ctl *tac)
{
	if (tac->flags)
		return -EINVAL;
	vcpu->arch.tpr_access_reporting = !!tac->enabled;
	return 0;
}

1401 1402 1403 1404 1405 1406
long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
	int r;
1407
	struct kvm_lapic_state *lapic = NULL;
1408 1409 1410

	switch (ioctl) {
	case KVM_GET_LAPIC: {
1411
		lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1412

1413 1414 1415 1416
		r = -ENOMEM;
		if (!lapic)
			goto out;
		r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
1417 1418 1419
		if (r)
			goto out;
		r = -EFAULT;
1420
		if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
1421 1422 1423 1424 1425
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_LAPIC: {
1426 1427 1428 1429
		lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
		r = -ENOMEM;
		if (!lapic)
			goto out;
1430
		r = -EFAULT;
1431
		if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
1432
			goto out;
1433
		r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
1434 1435 1436 1437 1438
		if (r)
			goto out;
		r = 0;
		break;
	}
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
	case KVM_INTERRUPT: {
		struct kvm_interrupt irq;

		r = -EFAULT;
		if (copy_from_user(&irq, argp, sizeof irq))
			goto out;
		r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
		if (r)
			goto out;
		r = 0;
		break;
	}
1451 1452 1453 1454 1455 1456 1457
	case KVM_NMI: {
		r = kvm_vcpu_ioctl_nmi(vcpu);
		if (r)
			goto out;
		r = 0;
		break;
	}
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	case KVM_SET_CPUID: {
		struct kvm_cpuid __user *cpuid_arg = argp;
		struct kvm_cpuid cpuid;

		r = -EFAULT;
		if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
			goto out;
		r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
		if (r)
			goto out;
		break;
	}
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
	case KVM_SET_CPUID2: {
		struct kvm_cpuid2 __user *cpuid_arg = argp;
		struct kvm_cpuid2 cpuid;

		r = -EFAULT;
		if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
			goto out;
		r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
				cpuid_arg->entries);
		if (r)
			goto out;
		break;
	}
	case KVM_GET_CPUID2: {
		struct kvm_cpuid2 __user *cpuid_arg = argp;
		struct kvm_cpuid2 cpuid;

		r = -EFAULT;
		if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
			goto out;
		r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
				cpuid_arg->entries);
		if (r)
			goto out;
		r = -EFAULT;
		if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
			goto out;
		r = 0;
		break;
	}
1500 1501 1502 1503 1504 1505
	case KVM_GET_MSRS:
		r = msr_io(vcpu, argp, kvm_get_msr, 1);
		break;
	case KVM_SET_MSRS:
		r = msr_io(vcpu, argp, do_set_msr, 0);
		break;
1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
	case KVM_TPR_ACCESS_REPORTING: {
		struct kvm_tpr_access_ctl tac;

		r = -EFAULT;
		if (copy_from_user(&tac, argp, sizeof tac))
			goto out;
		r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
		if (r)
			goto out;
		r = -EFAULT;
		if (copy_to_user(argp, &tac, sizeof tac))
			goto out;
		r = 0;
		break;
	};
A
Avi Kivity 已提交
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
	case KVM_SET_VAPIC_ADDR: {
		struct kvm_vapic_addr va;

		r = -EINVAL;
		if (!irqchip_in_kernel(vcpu->kvm))
			goto out;
		r = -EFAULT;
		if (copy_from_user(&va, argp, sizeof va))
			goto out;
		r = 0;
		kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
		break;
	}
1534 1535 1536 1537
	default:
		r = -EINVAL;
	}
out:
1538 1539
	if (lapic)
		kfree(lapic);
1540 1541 1542
	return r;
}

1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558
static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
{
	int ret;

	if (addr > (unsigned int)(-3 * PAGE_SIZE))
		return -1;
	ret = kvm_x86_ops->set_tss_addr(kvm, addr);
	return ret;
}

static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
					  u32 kvm_nr_mmu_pages)
{
	if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
		return -EINVAL;

1559
	down_write(&kvm->slots_lock);
1560 1561

	kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1562
	kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1563

1564
	up_write(&kvm->slots_lock);
1565 1566 1567 1568 1569
	return 0;
}

static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
{
1570
	return kvm->arch.n_alloc_mmu_pages;
1571 1572
}

1573 1574 1575 1576 1577
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
	int i;
	struct kvm_mem_alias *alias;

1578 1579
	for (i = 0; i < kvm->arch.naliases; ++i) {
		alias = &kvm->arch.aliases[i];
1580 1581 1582 1583 1584 1585 1586
		if (gfn >= alias->base_gfn
		    && gfn < alias->base_gfn + alias->npages)
			return alias->target_gfn + gfn - alias->base_gfn;
	}
	return gfn;
}

1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
/*
 * Set a new alias region.  Aliases map a portion of physical memory into
 * another portion.  This is useful for memory windows, for example the PC
 * VGA region.
 */
static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
					 struct kvm_memory_alias *alias)
{
	int r, n;
	struct kvm_mem_alias *p;

	r = -EINVAL;
	/* General sanity checks */
	if (alias->memory_size & (PAGE_SIZE - 1))
		goto out;
	if (alias->guest_phys_addr & (PAGE_SIZE - 1))
		goto out;
	if (alias->slot >= KVM_ALIAS_SLOTS)
		goto out;
	if (alias->guest_phys_addr + alias->memory_size
	    < alias->guest_phys_addr)
		goto out;
	if (alias->target_phys_addr + alias->memory_size
	    < alias->target_phys_addr)
		goto out;

1613
	down_write(&kvm->slots_lock);
1614
	spin_lock(&kvm->mmu_lock);
1615

1616
	p = &kvm->arch.aliases[alias->slot];
1617 1618 1619 1620 1621
	p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
	p->npages = alias->memory_size >> PAGE_SHIFT;
	p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;

	for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1622
		if (kvm->arch.aliases[n - 1].npages)
1623
			break;
1624
	kvm->arch.naliases = n;
1625

1626
	spin_unlock(&kvm->mmu_lock);
1627 1628
	kvm_mmu_zap_all(kvm);

1629
	up_write(&kvm->slots_lock);
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693

	return 0;

out:
	return r;
}

static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
{
	int r;

	r = 0;
	switch (chip->chip_id) {
	case KVM_IRQCHIP_PIC_MASTER:
		memcpy(&chip->chip.pic,
			&pic_irqchip(kvm)->pics[0],
			sizeof(struct kvm_pic_state));
		break;
	case KVM_IRQCHIP_PIC_SLAVE:
		memcpy(&chip->chip.pic,
			&pic_irqchip(kvm)->pics[1],
			sizeof(struct kvm_pic_state));
		break;
	case KVM_IRQCHIP_IOAPIC:
		memcpy(&chip->chip.ioapic,
			ioapic_irqchip(kvm),
			sizeof(struct kvm_ioapic_state));
		break;
	default:
		r = -EINVAL;
		break;
	}
	return r;
}

static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
{
	int r;

	r = 0;
	switch (chip->chip_id) {
	case KVM_IRQCHIP_PIC_MASTER:
		memcpy(&pic_irqchip(kvm)->pics[0],
			&chip->chip.pic,
			sizeof(struct kvm_pic_state));
		break;
	case KVM_IRQCHIP_PIC_SLAVE:
		memcpy(&pic_irqchip(kvm)->pics[1],
			&chip->chip.pic,
			sizeof(struct kvm_pic_state));
		break;
	case KVM_IRQCHIP_IOAPIC:
		memcpy(ioapic_irqchip(kvm),
			&chip->chip.ioapic,
			sizeof(struct kvm_ioapic_state));
		break;
	default:
		r = -EINVAL;
		break;
	}
	kvm_pic_update_irq(pic_irqchip(kvm));
	return r;
}

1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
	int r = 0;

	memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
	return r;
}

static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
	int r = 0;

	memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
	kvm_pit_load_count(kvm, 0, ps->channels[0].count);
	return r;
}

1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
				      struct kvm_dirty_log *log)
{
	int r;
	int n;
	struct kvm_memory_slot *memslot;
	int is_dirty = 0;

1722
	down_write(&kvm->slots_lock);
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737

	r = kvm_get_dirty_log(kvm, log, &is_dirty);
	if (r)
		goto out;

	/* If nothing is dirty, don't bother messing with page tables. */
	if (is_dirty) {
		kvm_mmu_slot_remove_write_access(kvm, log->slot);
		kvm_flush_remote_tlbs(kvm);
		memslot = &kvm->memslots[log->slot];
		n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
		memset(memslot->dirty_bitmap, 0, n);
	}
	r = 0;
out:
1738
	up_write(&kvm->slots_lock);
1739 1740 1741
	return r;
}

1742 1743 1744 1745 1746 1747
long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
	int r = -EINVAL;
1748 1749 1750 1751 1752 1753 1754 1755 1756
	/*
	 * This union makes it completely explicit to gcc-3.x
	 * that these two variables' stack usage should be
	 * combined, not added together.
	 */
	union {
		struct kvm_pit_state ps;
		struct kvm_memory_alias alias;
	} u;
1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787

	switch (ioctl) {
	case KVM_SET_TSS_ADDR:
		r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
		if (r < 0)
			goto out;
		break;
	case KVM_SET_MEMORY_REGION: {
		struct kvm_memory_region kvm_mem;
		struct kvm_userspace_memory_region kvm_userspace_mem;

		r = -EFAULT;
		if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
			goto out;
		kvm_userspace_mem.slot = kvm_mem.slot;
		kvm_userspace_mem.flags = kvm_mem.flags;
		kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
		kvm_userspace_mem.memory_size = kvm_mem.memory_size;
		r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
		if (r)
			goto out;
		break;
	}
	case KVM_SET_NR_MMU_PAGES:
		r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
		if (r)
			goto out;
		break;
	case KVM_GET_NR_MMU_PAGES:
		r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
		break;
1788
	case KVM_SET_MEMORY_ALIAS:
1789
		r = -EFAULT;
1790
		if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
1791
			goto out;
1792
		r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
1793 1794 1795 1796 1797
		if (r)
			goto out;
		break;
	case KVM_CREATE_IRQCHIP:
		r = -ENOMEM;
1798 1799
		kvm->arch.vpic = kvm_create_pic(kvm);
		if (kvm->arch.vpic) {
1800 1801
			r = kvm_ioapic_init(kvm);
			if (r) {
1802 1803
				kfree(kvm->arch.vpic);
				kvm->arch.vpic = NULL;
1804 1805 1806 1807 1808
				goto out;
			}
		} else
			goto out;
		break;
S
Sheng Yang 已提交
1809 1810 1811 1812 1813 1814
	case KVM_CREATE_PIT:
		r = -ENOMEM;
		kvm->arch.vpit = kvm_create_pit(kvm);
		if (kvm->arch.vpit)
			r = 0;
		break;
1815 1816 1817 1818 1819 1820 1821 1822
	case KVM_IRQ_LINE: {
		struct kvm_irq_level irq_event;

		r = -EFAULT;
		if (copy_from_user(&irq_event, argp, sizeof irq_event))
			goto out;
		if (irqchip_in_kernel(kvm)) {
			mutex_lock(&kvm->lock);
1823 1824
			kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
				    irq_event.irq, irq_event.level);
1825 1826 1827 1828 1829 1830 1831
			mutex_unlock(&kvm->lock);
			r = 0;
		}
		break;
	}
	case KVM_GET_IRQCHIP: {
		/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1832
		struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1833

1834 1835
		r = -ENOMEM;
		if (!chip)
1836
			goto out;
1837 1838 1839
		r = -EFAULT;
		if (copy_from_user(chip, argp, sizeof *chip))
			goto get_irqchip_out;
1840 1841
		r = -ENXIO;
		if (!irqchip_in_kernel(kvm))
1842 1843
			goto get_irqchip_out;
		r = kvm_vm_ioctl_get_irqchip(kvm, chip);
1844
		if (r)
1845
			goto get_irqchip_out;
1846
		r = -EFAULT;
1847 1848
		if (copy_to_user(argp, chip, sizeof *chip))
			goto get_irqchip_out;
1849
		r = 0;
1850 1851 1852 1853
	get_irqchip_out:
		kfree(chip);
		if (r)
			goto out;
1854 1855 1856 1857
		break;
	}
	case KVM_SET_IRQCHIP: {
		/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1858
		struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1859

1860 1861
		r = -ENOMEM;
		if (!chip)
1862
			goto out;
1863 1864 1865
		r = -EFAULT;
		if (copy_from_user(chip, argp, sizeof *chip))
			goto set_irqchip_out;
1866 1867
		r = -ENXIO;
		if (!irqchip_in_kernel(kvm))
1868 1869
			goto set_irqchip_out;
		r = kvm_vm_ioctl_set_irqchip(kvm, chip);
1870
		if (r)
1871
			goto set_irqchip_out;
1872
		r = 0;
1873 1874 1875 1876
	set_irqchip_out:
		kfree(chip);
		if (r)
			goto out;
1877 1878
		break;
	}
1879 1880
	case KVM_GET_PIT: {
		r = -EFAULT;
1881
		if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
1882 1883 1884 1885
			goto out;
		r = -ENXIO;
		if (!kvm->arch.vpit)
			goto out;
1886
		r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
1887 1888 1889
		if (r)
			goto out;
		r = -EFAULT;
1890
		if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
1891 1892 1893 1894 1895 1896
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_PIT: {
		r = -EFAULT;
1897
		if (copy_from_user(&u.ps, argp, sizeof u.ps))
1898 1899 1900 1901
			goto out;
		r = -ENXIO;
		if (!kvm->arch.vpit)
			goto out;
1902
		r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
1903 1904 1905 1906 1907
		if (r)
			goto out;
		r = 0;
		break;
	}
1908 1909 1910 1911 1912 1913 1914
	default:
		;
	}
out:
	return r;
}

1915
static void kvm_init_msr_list(void)
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
{
	u32 dummy[2];
	unsigned i, j;

	for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
		if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
			continue;
		if (j < i)
			msrs_to_save[j] = msrs_to_save[i];
		j++;
	}
	num_msrs_to_save = j;
}

1930 1931 1932 1933
/*
 * Only apic need an MMIO device hook, so shortcut now..
 */
static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1934 1935
						gpa_t addr, int len,
						int is_write)
1936 1937 1938
{
	struct kvm_io_device *dev;

1939 1940
	if (vcpu->arch.apic) {
		dev = &vcpu->arch.apic->dev;
1941
		if (dev->in_range(dev, addr, len, is_write))
1942 1943 1944 1945 1946 1947 1948
			return dev;
	}
	return NULL;
}


static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1949 1950
						gpa_t addr, int len,
						int is_write)
1951 1952 1953
{
	struct kvm_io_device *dev;

1954
	dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
1955
	if (dev == NULL)
1956 1957
		dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
					  is_write);
1958 1959 1960 1961 1962 1963 1964 1965 1966
	return dev;
}

int emulator_read_std(unsigned long addr,
			     void *val,
			     unsigned int bytes,
			     struct kvm_vcpu *vcpu)
{
	void *data = val;
1967
	int r = X86EMUL_CONTINUE;
1968 1969

	while (bytes) {
1970
		gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1971 1972 1973 1974
		unsigned offset = addr & (PAGE_SIZE-1);
		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
		int ret;

1975 1976 1977 1978
		if (gpa == UNMAPPED_GVA) {
			r = X86EMUL_PROPAGATE_FAULT;
			goto out;
		}
1979
		ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1980 1981 1982 1983
		if (ret < 0) {
			r = X86EMUL_UNHANDLEABLE;
			goto out;
		}
1984 1985 1986 1987 1988

		bytes -= tocopy;
		data += tocopy;
		addr += tocopy;
	}
1989 1990
out:
	return r;
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
}
EXPORT_SYMBOL_GPL(emulator_read_std);

static int emulator_read_emulated(unsigned long addr,
				  void *val,
				  unsigned int bytes,
				  struct kvm_vcpu *vcpu)
{
	struct kvm_io_device *mmio_dev;
	gpa_t                 gpa;

	if (vcpu->mmio_read_completed) {
		memcpy(val, vcpu->mmio_data, bytes);
		vcpu->mmio_read_completed = 0;
		return X86EMUL_CONTINUE;
	}

2008
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

	/* For APIC access vmexit */
	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
		goto mmio;

	if (emulator_read_std(addr, val, bytes, vcpu)
			== X86EMUL_CONTINUE)
		return X86EMUL_CONTINUE;
	if (gpa == UNMAPPED_GVA)
		return X86EMUL_PROPAGATE_FAULT;

mmio:
	/*
	 * Is this MMIO handled locally?
	 */
2024
	mutex_lock(&vcpu->kvm->lock);
2025
	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
2026 2027
	if (mmio_dev) {
		kvm_iodevice_read(mmio_dev, gpa, bytes, val);
2028
		mutex_unlock(&vcpu->kvm->lock);
2029 2030
		return X86EMUL_CONTINUE;
	}
2031
	mutex_unlock(&vcpu->kvm->lock);
2032 2033 2034 2035 2036 2037 2038 2039 2040

	vcpu->mmio_needed = 1;
	vcpu->mmio_phys_addr = gpa;
	vcpu->mmio_size = bytes;
	vcpu->mmio_is_write = 0;

	return X86EMUL_UNHANDLEABLE;
}

2041
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
2042
			  const void *val, int bytes)
2043 2044 2045 2046
{
	int ret;

	ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
2047
	if (ret < 0)
2048
		return 0;
2049
	kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
2050 2051 2052 2053 2054 2055 2056 2057 2058
	return 1;
}

static int emulator_write_emulated_onepage(unsigned long addr,
					   const void *val,
					   unsigned int bytes,
					   struct kvm_vcpu *vcpu)
{
	struct kvm_io_device *mmio_dev;
2059 2060 2061
	gpa_t                 gpa;

	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2062 2063

	if (gpa == UNMAPPED_GVA) {
2064
		kvm_inject_page_fault(vcpu, addr, 2);
2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078
		return X86EMUL_PROPAGATE_FAULT;
	}

	/* For APIC access vmexit */
	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
		goto mmio;

	if (emulator_write_phys(vcpu, gpa, val, bytes))
		return X86EMUL_CONTINUE;

mmio:
	/*
	 * Is this MMIO handled locally?
	 */
2079
	mutex_lock(&vcpu->kvm->lock);
2080
	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
2081 2082
	if (mmio_dev) {
		kvm_iodevice_write(mmio_dev, gpa, bytes, val);
2083
		mutex_unlock(&vcpu->kvm->lock);
2084 2085
		return X86EMUL_CONTINUE;
	}
2086
	mutex_unlock(&vcpu->kvm->lock);
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129

	vcpu->mmio_needed = 1;
	vcpu->mmio_phys_addr = gpa;
	vcpu->mmio_size = bytes;
	vcpu->mmio_is_write = 1;
	memcpy(vcpu->mmio_data, val, bytes);

	return X86EMUL_CONTINUE;
}

int emulator_write_emulated(unsigned long addr,
				   const void *val,
				   unsigned int bytes,
				   struct kvm_vcpu *vcpu)
{
	/* Crossing a page boundary? */
	if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
		int rc, now;

		now = -addr & ~PAGE_MASK;
		rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
		if (rc != X86EMUL_CONTINUE)
			return rc;
		addr += now;
		val += now;
		bytes -= now;
	}
	return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
}
EXPORT_SYMBOL_GPL(emulator_write_emulated);

static int emulator_cmpxchg_emulated(unsigned long addr,
				     const void *old,
				     const void *new,
				     unsigned int bytes,
				     struct kvm_vcpu *vcpu)
{
	static int reported;

	if (!reported) {
		reported = 1;
		printk(KERN_WARNING "kvm: emulating exchange as write\n");
	}
2130 2131 2132
#ifndef CONFIG_X86_64
	/* guests cmpxchg8b have to be emulated atomically */
	if (bytes == 8) {
2133
		gpa_t gpa;
2134
		struct page *page;
A
Andrew Morton 已提交
2135
		char *kaddr;
2136 2137
		u64 val;

2138 2139
		gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);

2140 2141 2142 2143 2144 2145 2146 2147
		if (gpa == UNMAPPED_GVA ||
		   (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
			goto emul_write;

		if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
			goto emul_write;

		val = *(u64 *)new;
2148

2149
		page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2150

A
Andrew Morton 已提交
2151 2152 2153
		kaddr = kmap_atomic(page, KM_USER0);
		set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
		kunmap_atomic(kaddr, KM_USER0);
2154 2155
		kvm_release_page_dirty(page);
	}
2156
emul_write:
2157 2158
#endif

2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
	return emulator_write_emulated(addr, new, bytes, vcpu);
}

static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	return kvm_x86_ops->get_segment_base(vcpu, seg);
}

int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
{
M
Marcelo Tosatti 已提交
2169
	kvm_mmu_invlpg(vcpu, address);
2170 2171 2172 2173 2174
	return X86EMUL_CONTINUE;
}

int emulate_clts(struct kvm_vcpu *vcpu)
{
J
Joerg Roedel 已提交
2175
	KVMTRACE_0D(CLTS, vcpu, handler);
2176
	kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
	return X86EMUL_CONTINUE;
}

int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
{
	struct kvm_vcpu *vcpu = ctxt->vcpu;

	switch (dr) {
	case 0 ... 3:
		*dest = kvm_x86_ops->get_dr(vcpu, dr);
		return X86EMUL_CONTINUE;
	default:
2189
		pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
		return X86EMUL_UNHANDLEABLE;
	}
}

int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
{
	unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
	int exception;

	kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
	if (exception) {
		/* FIXME: better handling */
		return X86EMUL_UNHANDLEABLE;
	}
	return X86EMUL_CONTINUE;
}

void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
{
	u8 opcodes[4];
2210
	unsigned long rip = kvm_rip_read(vcpu);
2211 2212
	unsigned long rip_linear;

2213
	if (!printk_ratelimit())
2214 2215
		return;

2216 2217
	rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);

2218 2219 2220 2221 2222 2223 2224
	emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);

	printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
	       context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
}
EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);

2225
static struct x86_emulate_ops emulate_ops = {
2226 2227 2228 2229 2230 2231
	.read_std            = emulator_read_std,
	.read_emulated       = emulator_read_emulated,
	.write_emulated      = emulator_write_emulated,
	.cmpxchg_emulated    = emulator_cmpxchg_emulated,
};

2232 2233 2234 2235 2236 2237 2238 2239
static void cache_all_regs(struct kvm_vcpu *vcpu)
{
	kvm_register_read(vcpu, VCPU_REGS_RAX);
	kvm_register_read(vcpu, VCPU_REGS_RSP);
	kvm_register_read(vcpu, VCPU_REGS_RIP);
	vcpu->arch.regs_dirty = ~0;
}

2240 2241 2242 2243
int emulate_instruction(struct kvm_vcpu *vcpu,
			struct kvm_run *run,
			unsigned long cr2,
			u16 error_code,
2244
			int emulation_type)
2245 2246
{
	int r;
2247
	struct decode_cache *c;
2248

2249
	kvm_clear_exception_queue(vcpu);
2250
	vcpu->arch.mmio_fault_cr2 = cr2;
2251 2252 2253 2254 2255 2256 2257
	/*
	 * TODO: fix x86_emulate.c to use guest_read/write_register
	 * instead of direct ->regs accesses, can save hundred cycles
	 * on Intel for instructions that don't read/change RSP, for
	 * for example.
	 */
	cache_all_regs(vcpu);
2258 2259

	vcpu->mmio_is_write = 0;
2260
	vcpu->arch.pio.string = 0;
2261

2262
	if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2263 2264 2265
		int cs_db, cs_l;
		kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);

2266 2267 2268 2269
		vcpu->arch.emulate_ctxt.vcpu = vcpu;
		vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
		vcpu->arch.emulate_ctxt.mode =
			(vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2270 2271 2272 2273
			? X86EMUL_MODE_REAL : cs_l
			? X86EMUL_MODE_PROT64 :	cs_db
			? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;

2274
		r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2275 2276 2277 2278 2279 2280 2281 2282 2283 2284

		/* Reject the instructions other than VMCALL/VMMCALL when
		 * try to emulate invalid opcode */
		c = &vcpu->arch.emulate_ctxt.decode;
		if ((emulation_type & EMULTYPE_TRAP_UD) &&
		    (!(c->twobyte && c->b == 0x01 &&
		      (c->modrm_reg == 0 || c->modrm_reg == 3) &&
		       c->modrm_mod == 3 && c->modrm_rm == 1)))
			return EMULATE_FAIL;

2285
		++vcpu->stat.insn_emulation;
2286
		if (r)  {
2287
			++vcpu->stat.insn_emulation_fail;
2288 2289 2290 2291 2292 2293
			if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
				return EMULATE_DONE;
			return EMULATE_FAIL;
		}
	}

2294
	r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2295

2296
	if (vcpu->arch.pio.string)
2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316
		return EMULATE_DO_MMIO;

	if ((r || vcpu->mmio_is_write) && run) {
		run->exit_reason = KVM_EXIT_MMIO;
		run->mmio.phys_addr = vcpu->mmio_phys_addr;
		memcpy(run->mmio.data, vcpu->mmio_data, 8);
		run->mmio.len = vcpu->mmio_size;
		run->mmio.is_write = vcpu->mmio_is_write;
	}

	if (r) {
		if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
			return EMULATE_DONE;
		if (!vcpu->mmio_needed) {
			kvm_report_emulation_failure(vcpu, "mmio");
			return EMULATE_FAIL;
		}
		return EMULATE_DO_MMIO;
	}

2317
	kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2318 2319 2320 2321 2322 2323 2324 2325 2326 2327

	if (vcpu->mmio_is_write) {
		vcpu->mmio_needed = 0;
		return EMULATE_DO_MMIO;
	}

	return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(emulate_instruction);

2328 2329 2330 2331
static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
{
	int i;

2332 2333 2334 2335
	for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i)
		if (vcpu->arch.pio.guest_pages[i]) {
			kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]);
			vcpu->arch.pio.guest_pages[i] = NULL;
2336 2337 2338 2339 2340
		}
}

static int pio_copy_data(struct kvm_vcpu *vcpu)
{
2341
	void *p = vcpu->arch.pio_data;
2342 2343
	void *q;
	unsigned bytes;
2344
	int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
2345

2346
	q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
2347 2348 2349 2350 2351
		 PAGE_KERNEL);
	if (!q) {
		free_pio_guest_pages(vcpu);
		return -ENOMEM;
	}
2352 2353 2354
	q += vcpu->arch.pio.guest_page_offset;
	bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
	if (vcpu->arch.pio.in)
2355 2356 2357
		memcpy(q, p, bytes);
	else
		memcpy(p, q, bytes);
2358
	q -= vcpu->arch.pio.guest_page_offset;
2359 2360 2361 2362 2363 2364 2365
	vunmap(q);
	free_pio_guest_pages(vcpu);
	return 0;
}

int complete_pio(struct kvm_vcpu *vcpu)
{
2366
	struct kvm_pio_request *io = &vcpu->arch.pio;
2367 2368
	long delta;
	int r;
2369
	unsigned long val;
2370 2371

	if (!io->string) {
2372 2373 2374 2375 2376
		if (io->in) {
			val = kvm_register_read(vcpu, VCPU_REGS_RAX);
			memcpy(&val, vcpu->arch.pio_data, io->size);
			kvm_register_write(vcpu, VCPU_REGS_RAX, val);
		}
2377 2378 2379
	} else {
		if (io->in) {
			r = pio_copy_data(vcpu);
2380
			if (r)
2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
				return r;
		}

		delta = 1;
		if (io->rep) {
			delta *= io->cur_count;
			/*
			 * The size of the register should really depend on
			 * current address size.
			 */
2391 2392 2393
			val = kvm_register_read(vcpu, VCPU_REGS_RCX);
			val -= delta;
			kvm_register_write(vcpu, VCPU_REGS_RCX, val);
2394 2395 2396 2397
		}
		if (io->down)
			delta = -delta;
		delta *= io->size;
2398 2399 2400 2401 2402 2403 2404 2405 2406
		if (io->in) {
			val = kvm_register_read(vcpu, VCPU_REGS_RDI);
			val += delta;
			kvm_register_write(vcpu, VCPU_REGS_RDI, val);
		} else {
			val = kvm_register_read(vcpu, VCPU_REGS_RSI);
			val += delta;
			kvm_register_write(vcpu, VCPU_REGS_RSI, val);
		}
2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421
	}

	io->count -= io->cur_count;
	io->cur_count = 0;

	return 0;
}

static void kernel_pio(struct kvm_io_device *pio_dev,
		       struct kvm_vcpu *vcpu,
		       void *pd)
{
	/* TODO: String I/O for in kernel device */

	mutex_lock(&vcpu->kvm->lock);
2422 2423 2424
	if (vcpu->arch.pio.in)
		kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
				  vcpu->arch.pio.size,
2425 2426
				  pd);
	else
2427 2428
		kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
				   vcpu->arch.pio.size,
2429 2430 2431 2432 2433 2434 2435
				   pd);
	mutex_unlock(&vcpu->kvm->lock);
}

static void pio_string_write(struct kvm_io_device *pio_dev,
			     struct kvm_vcpu *vcpu)
{
2436 2437
	struct kvm_pio_request *io = &vcpu->arch.pio;
	void *pd = vcpu->arch.pio_data;
2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
	int i;

	mutex_lock(&vcpu->kvm->lock);
	for (i = 0; i < io->cur_count; i++) {
		kvm_iodevice_write(pio_dev, io->port,
				   io->size,
				   pd);
		pd += io->size;
	}
	mutex_unlock(&vcpu->kvm->lock);
}

static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2451 2452
					       gpa_t addr, int len,
					       int is_write)
2453
{
2454
	return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
2455 2456 2457 2458 2459 2460
}

int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
		  int size, unsigned port)
{
	struct kvm_io_device *pio_dev;
2461
	unsigned long val;
2462 2463 2464

	vcpu->run->exit_reason = KVM_EXIT_IO;
	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2465
	vcpu->run->io.size = vcpu->arch.pio.size = size;
2466
	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2467 2468 2469 2470 2471 2472 2473
	vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
	vcpu->run->io.port = vcpu->arch.pio.port = port;
	vcpu->arch.pio.in = in;
	vcpu->arch.pio.string = 0;
	vcpu->arch.pio.down = 0;
	vcpu->arch.pio.guest_page_offset = 0;
	vcpu->arch.pio.rep = 0;
2474

F
Feng (Eric) Liu 已提交
2475 2476 2477 2478 2479 2480 2481
	if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
		KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
			    handler);
	else
		KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
			    handler);

2482 2483
	val = kvm_register_read(vcpu, VCPU_REGS_RAX);
	memcpy(vcpu->arch.pio_data, &val, 4);
2484

2485
	pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
2486
	if (pio_dev) {
2487
		kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
		complete_pio(vcpu);
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_emulate_pio);

int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
		  int size, unsigned long count, int down,
		  gva_t address, int rep, unsigned port)
{
	unsigned now, in_page;
	int i, ret = 0;
	int nr_pages = 1;
	struct page *page;
	struct kvm_io_device *pio_dev;

	vcpu->run->exit_reason = KVM_EXIT_IO;
	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2507
	vcpu->run->io.size = vcpu->arch.pio.size = size;
2508
	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2509 2510 2511 2512 2513 2514 2515
	vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
	vcpu->run->io.port = vcpu->arch.pio.port = port;
	vcpu->arch.pio.in = in;
	vcpu->arch.pio.string = 1;
	vcpu->arch.pio.down = down;
	vcpu->arch.pio.guest_page_offset = offset_in_page(address);
	vcpu->arch.pio.rep = rep;
2516

F
Feng (Eric) Liu 已提交
2517 2518 2519 2520 2521 2522 2523
	if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
		KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
			    handler);
	else
		KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
			    handler);

2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547
	if (!count) {
		kvm_x86_ops->skip_emulated_instruction(vcpu);
		return 1;
	}

	if (!down)
		in_page = PAGE_SIZE - offset_in_page(address);
	else
		in_page = offset_in_page(address) + size;
	now = min(count, (unsigned long)in_page / size);
	if (!now) {
		/*
		 * String I/O straddles page boundary.  Pin two guest pages
		 * so that we satisfy atomicity constraints.  Do just one
		 * transaction to avoid complexity.
		 */
		nr_pages = 2;
		now = 1;
	}
	if (down) {
		/*
		 * String I/O in reverse.  Yuck.  Kill the guest, fix later.
		 */
		pr_unimpl(vcpu, "guest string pio down\n");
2548
		kvm_inject_gp(vcpu, 0);
2549 2550 2551
		return 1;
	}
	vcpu->run->io.count = now;
2552
	vcpu->arch.pio.cur_count = now;
2553

2554
	if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2555 2556 2557 2558
		kvm_x86_ops->skip_emulated_instruction(vcpu);

	for (i = 0; i < nr_pages; ++i) {
		page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2559
		vcpu->arch.pio.guest_pages[i] = page;
2560
		if (!page) {
2561
			kvm_inject_gp(vcpu, 0);
2562 2563 2564 2565 2566
			free_pio_guest_pages(vcpu);
			return 1;
		}
	}

2567 2568 2569
	pio_dev = vcpu_find_pio_dev(vcpu, port,
				    vcpu->arch.pio.cur_count,
				    !vcpu->arch.pio.in);
2570
	if (!vcpu->arch.pio.in) {
2571 2572 2573 2574 2575
		/* string PIO write */
		ret = pio_copy_data(vcpu);
		if (ret >= 0 && pio_dev) {
			pio_string_write(pio_dev, vcpu);
			complete_pio(vcpu);
2576
			if (vcpu->arch.pio.count == 0)
2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
				ret = 1;
		}
	} else if (pio_dev)
		pr_unimpl(vcpu, "no string pio read support yet, "
		       "port %x size %d count %ld\n",
			port, size, count);

	return ret;
}
EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);

2588
int kvm_arch_init(void *opaque)
2589
{
2590
	int r;
2591 2592 2593 2594
	struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;

	if (kvm_x86_ops) {
		printk(KERN_ERR "kvm: already loaded the other module\n");
2595 2596
		r = -EEXIST;
		goto out;
2597 2598 2599 2600
	}

	if (!ops->cpu_has_kvm_support()) {
		printk(KERN_ERR "kvm: no hardware support\n");
2601 2602
		r = -EOPNOTSUPP;
		goto out;
2603 2604 2605
	}
	if (ops->disabled_by_bios()) {
		printk(KERN_ERR "kvm: disabled by bios\n");
2606 2607
		r = -EOPNOTSUPP;
		goto out;
2608 2609
	}

2610 2611 2612 2613 2614 2615
	r = kvm_mmu_module_init();
	if (r)
		goto out;

	kvm_init_msr_list();

2616
	kvm_x86_ops = ops;
2617
	kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
S
Sheng Yang 已提交
2618 2619
	kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
	kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
S
Sheng Yang 已提交
2620
			PT_DIRTY_MASK, PT64_NX_MASK, 0, 0);
2621
	return 0;
2622 2623 2624

out:
	return r;
2625
}
2626

2627 2628 2629
void kvm_arch_exit(void)
{
	kvm_x86_ops = NULL;
2630 2631
	kvm_mmu_module_exit();
}
2632

2633 2634 2635
int kvm_emulate_halt(struct kvm_vcpu *vcpu)
{
	++vcpu->stat.halt_exits;
F
Feng (Eric) Liu 已提交
2636
	KVMTRACE_0D(HLT, vcpu, handler);
2637
	if (irqchip_in_kernel(vcpu->kvm)) {
2638
		vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2639 2640 2641 2642 2643 2644 2645 2646
		return 1;
	} else {
		vcpu->run->exit_reason = KVM_EXIT_HLT;
		return 0;
	}
}
EXPORT_SYMBOL_GPL(kvm_emulate_halt);

2647 2648 2649 2650 2651 2652 2653 2654 2655
static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
			   unsigned long a1)
{
	if (is_long_mode(vcpu))
		return a0;
	else
		return a0 | ((gpa_t)a1 << 32);
}

2656 2657 2658
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
{
	unsigned long nr, a0, a1, a2, a3, ret;
2659
	int r = 1;
2660

2661 2662 2663 2664 2665
	nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
	a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
	a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
	a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
	a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
2666

F
Feng (Eric) Liu 已提交
2667 2668
	KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);

2669 2670 2671 2672 2673 2674 2675 2676 2677
	if (!is_long_mode(vcpu)) {
		nr &= 0xFFFFFFFF;
		a0 &= 0xFFFFFFFF;
		a1 &= 0xFFFFFFFF;
		a2 &= 0xFFFFFFFF;
		a3 &= 0xFFFFFFFF;
	}

	switch (nr) {
A
Avi Kivity 已提交
2678 2679 2680
	case KVM_HC_VAPIC_POLL_IRQ:
		ret = 0;
		break;
2681 2682 2683
	case KVM_HC_MMU_OP:
		r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
		break;
2684 2685 2686 2687
	default:
		ret = -KVM_ENOSYS;
		break;
	}
2688
	kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
A
Amit Shah 已提交
2689
	++vcpu->stat.hypercalls;
2690
	return r;
2691 2692 2693 2694 2695 2696 2697
}
EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);

int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
{
	char instruction[3];
	int ret = 0;
2698
	unsigned long rip = kvm_rip_read(vcpu);
2699 2700 2701 2702 2703 2704 2705 2706 2707 2708


	/*
	 * Blow out the MMU to ensure that no other VCPU has an active mapping
	 * to ensure that the updated hypercall appears atomically across all
	 * VCPUs.
	 */
	kvm_mmu_zap_all(vcpu->kvm);

	kvm_x86_ops->patch_hypercall(vcpu, instruction);
2709
	if (emulator_write_emulated(rip, instruction, 3, vcpu)
2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737
	    != X86EMUL_CONTINUE)
		ret = -EFAULT;

	return ret;
}

static u64 mk_cr_64(u64 curr_cr, u32 new_val)
{
	return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
}

void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
{
	struct descriptor_table dt = { limit, base };

	kvm_x86_ops->set_gdt(vcpu, &dt);
}

void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
{
	struct descriptor_table dt = { limit, base };

	kvm_x86_ops->set_idt(vcpu, &dt);
}

void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
		   unsigned long *rflags)
{
2738
	kvm_lmsw(vcpu, msw);
2739 2740 2741 2742 2743
	*rflags = kvm_x86_ops->get_rflags(vcpu);
}

unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
{
J
Joerg Roedel 已提交
2744 2745
	unsigned long value;

2746 2747 2748
	kvm_x86_ops->decache_cr4_guest_bits(vcpu);
	switch (cr) {
	case 0:
J
Joerg Roedel 已提交
2749 2750
		value = vcpu->arch.cr0;
		break;
2751
	case 2:
J
Joerg Roedel 已提交
2752 2753
		value = vcpu->arch.cr2;
		break;
2754
	case 3:
J
Joerg Roedel 已提交
2755 2756
		value = vcpu->arch.cr3;
		break;
2757
	case 4:
J
Joerg Roedel 已提交
2758 2759
		value = vcpu->arch.cr4;
		break;
2760
	case 8:
J
Joerg Roedel 已提交
2761 2762
		value = kvm_get_cr8(vcpu);
		break;
2763
	default:
2764
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2765 2766
		return 0;
	}
J
Joerg Roedel 已提交
2767 2768 2769 2770
	KVMTRACE_3D(CR_READ, vcpu, (u32)cr, (u32)value,
		    (u32)((u64)value >> 32), handler);

	return value;
2771 2772 2773 2774 2775
}

void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
		     unsigned long *rflags)
{
J
Joerg Roedel 已提交
2776 2777 2778
	KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)val,
		    (u32)((u64)val >> 32), handler);

2779 2780
	switch (cr) {
	case 0:
2781
		kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2782 2783 2784
		*rflags = kvm_x86_ops->get_rflags(vcpu);
		break;
	case 2:
2785
		vcpu->arch.cr2 = val;
2786 2787
		break;
	case 3:
2788
		kvm_set_cr3(vcpu, val);
2789 2790
		break;
	case 4:
2791
		kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2792
		break;
2793
	case 8:
2794
		kvm_set_cr8(vcpu, val & 0xfUL);
2795
		break;
2796
	default:
2797
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2798 2799 2800
	}
}

2801 2802
static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
{
2803 2804
	struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
	int j, nent = vcpu->arch.cpuid_nent;
2805 2806 2807

	e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
	/* when no next entry is found, the current entry[i] is reselected */
2808
	for (j = i + 1; ; j = (j + 1) % nent) {
2809
		struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832
		if (ej->function == e->function) {
			ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
			return j;
		}
	}
	return 0; /* silence gcc, even though control never reaches here */
}

/* find an entry with matching function, matching index (if needed), and that
 * should be read next (if it's stateful) */
static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
	u32 function, u32 index)
{
	if (e->function != function)
		return 0;
	if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
		return 0;
	if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
		!(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
		return 0;
	return 1;
}

2833 2834 2835
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
{
	int i;
2836 2837
	u32 function, index;
	struct kvm_cpuid_entry2 *e, *best;
2838

2839 2840 2841 2842 2843 2844
	function = kvm_register_read(vcpu, VCPU_REGS_RAX);
	index = kvm_register_read(vcpu, VCPU_REGS_RCX);
	kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
	kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
	kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
	kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
2845
	best = NULL;
2846 2847
	for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
		e = &vcpu->arch.cpuid_entries[i];
2848 2849 2850
		if (is_matching_cpuid_entry(e, function, index)) {
			if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
				move_to_next_stateful_cpuid_entry(vcpu, i);
2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861
			best = e;
			break;
		}
		/*
		 * Both basic or both extended?
		 */
		if (((e->function ^ function) & 0x80000000) == 0)
			if (!best || e->function > best->function)
				best = e;
	}
	if (best) {
2862 2863 2864 2865
		kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
		kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
		kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
		kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
2866 2867
	}
	kvm_x86_ops->skip_emulated_instruction(vcpu);
F
Feng (Eric) Liu 已提交
2868
	KVMTRACE_5D(CPUID, vcpu, function,
2869 2870 2871 2872
		    (u32)kvm_register_read(vcpu, VCPU_REGS_RAX),
		    (u32)kvm_register_read(vcpu, VCPU_REGS_RBX),
		    (u32)kvm_register_read(vcpu, VCPU_REGS_RCX),
		    (u32)kvm_register_read(vcpu, VCPU_REGS_RDX), handler);
2873 2874
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2875

2876 2877 2878 2879 2880 2881 2882 2883 2884
/*
 * Check if userspace requested an interrupt window, and that the
 * interrupt window is open.
 *
 * No need to exit to userspace if we already have an interrupt queued.
 */
static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
					  struct kvm_run *kvm_run)
{
2885
	return (!vcpu->arch.irq_summary &&
2886
		kvm_run->request_interrupt_window &&
2887
		vcpu->arch.interrupt_window_open &&
2888 2889 2890 2891 2892 2893 2894
		(kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
}

static void post_kvm_run_save(struct kvm_vcpu *vcpu,
			      struct kvm_run *kvm_run)
{
	kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2895
	kvm_run->cr8 = kvm_get_cr8(vcpu);
2896
	kvm_run->apic_base = kvm_get_apic_base(vcpu);
2897
	if (irqchip_in_kernel(vcpu->kvm))
2898
		kvm_run->ready_for_interrupt_injection = 1;
2899
	else
2900
		kvm_run->ready_for_interrupt_injection =
2901 2902
					(vcpu->arch.interrupt_window_open &&
					 vcpu->arch.irq_summary == 0);
2903 2904
}

A
Avi Kivity 已提交
2905 2906 2907 2908 2909 2910 2911 2912 2913
static void vapic_enter(struct kvm_vcpu *vcpu)
{
	struct kvm_lapic *apic = vcpu->arch.apic;
	struct page *page;

	if (!apic || !apic->vapic_addr)
		return;

	page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2914 2915

	vcpu->arch.apic->vapic_page = page;
A
Avi Kivity 已提交
2916 2917 2918 2919 2920 2921 2922 2923 2924
}

static void vapic_exit(struct kvm_vcpu *vcpu)
{
	struct kvm_lapic *apic = vcpu->arch.apic;

	if (!apic || !apic->vapic_addr)
		return;

2925
	down_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2926 2927
	kvm_release_page_dirty(apic->vapic_page);
	mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2928
	up_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2929 2930
}

2931
static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2932 2933 2934
{
	int r;

2935 2936 2937 2938
	if (vcpu->requests)
		if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
			kvm_mmu_unload(vcpu);

2939 2940 2941 2942
	r = kvm_mmu_reload(vcpu);
	if (unlikely(r))
		goto out;

2943 2944
	if (vcpu->requests) {
		if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
M
Marcelo Tosatti 已提交
2945
			__kvm_migrate_timers(vcpu);
2946 2947
		if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
			kvm_mmu_sync_roots(vcpu);
2948 2949
		if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
			kvm_x86_ops->tlb_flush(vcpu);
A
Avi Kivity 已提交
2950 2951 2952 2953 2954 2955
		if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
				       &vcpu->requests)) {
			kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
			r = 0;
			goto out;
		}
J
Joerg Roedel 已提交
2956 2957 2958 2959 2960
		if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
			kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
			r = 0;
			goto out;
		}
2961
	}
A
Avi Kivity 已提交
2962

2963
	clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
2964 2965 2966 2967 2968 2969 2970 2971 2972
	kvm_inject_pending_timer_irqs(vcpu);

	preempt_disable();

	kvm_x86_ops->prepare_guest_switch(vcpu);
	kvm_load_guest_fpu(vcpu);

	local_irq_disable();

2973
	if (vcpu->requests || need_resched() || signal_pending(current)) {
2974 2975 2976 2977 2978 2979
		local_irq_enable();
		preempt_enable();
		r = 1;
		goto out;
	}

2980 2981
	if (vcpu->guest_debug.enabled)
		kvm_x86_ops->guest_debug_pre(vcpu);
2982

2983 2984 2985 2986 2987 2988 2989
	vcpu->guest_mode = 1;
	/*
	 * Make sure that guest_mode assignment won't happen after
	 * testing the pending IRQ vector bitmap.
	 */
	smp_wmb();

2990
	if (vcpu->arch.exception.pending)
2991 2992
		__queue_exception(vcpu);
	else if (irqchip_in_kernel(vcpu->kvm))
2993
		kvm_x86_ops->inject_pending_irq(vcpu);
2994
	else
2995 2996
		kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);

A
Avi Kivity 已提交
2997 2998
	kvm_lapic_sync_to_vapic(vcpu);

2999 3000
	up_read(&vcpu->kvm->slots_lock);

3001 3002 3003
	kvm_guest_enter();


F
Feng (Eric) Liu 已提交
3004
	KVMTRACE_0D(VMENTRY, vcpu, entryexit);
3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023
	kvm_x86_ops->run(vcpu, kvm_run);

	vcpu->guest_mode = 0;
	local_irq_enable();

	++vcpu->stat.exits;

	/*
	 * We must have an instruction between local_irq_enable() and
	 * kvm_guest_exit(), so the timer interrupt isn't delayed by
	 * the interrupt shadow.  The stat.exits increment will do nicely.
	 * But we need to prevent reordering, hence this barrier():
	 */
	barrier();

	kvm_guest_exit();

	preempt_enable();

3024 3025
	down_read(&vcpu->kvm->slots_lock);

3026 3027 3028 3029
	/*
	 * Profile KVM exit RIPs:
	 */
	if (unlikely(prof_on == KVM_PROFILING)) {
3030 3031
		unsigned long rip = kvm_rip_read(vcpu);
		profile_hit(KVM_PROFILING, (void *)rip);
3032 3033
	}

3034 3035
	if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
		vcpu->arch.exception.pending = false;
3036

A
Avi Kivity 已提交
3037 3038
	kvm_lapic_sync_from_vapic(vcpu);

3039
	r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
3040 3041 3042
out:
	return r;
}
3043

3044 3045 3046 3047 3048
static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	int r;

	if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
3049 3050
		pr_debug("vcpu %d received sipi with vector # %x\n",
			 vcpu->vcpu_id, vcpu->arch.sipi_vector);
3051
		kvm_lapic_reset(vcpu);
3052
		r = kvm_arch_vcpu_reset(vcpu);
3053 3054 3055
		if (r)
			return r;
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3056 3057
	}

3058 3059 3060 3061 3062
	down_read(&vcpu->kvm->slots_lock);
	vapic_enter(vcpu);

	r = 1;
	while (r > 0) {
3063
		if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093
			r = vcpu_enter_guest(vcpu, kvm_run);
		else {
			up_read(&vcpu->kvm->slots_lock);
			kvm_vcpu_block(vcpu);
			down_read(&vcpu->kvm->slots_lock);
			if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
				if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
					vcpu->arch.mp_state =
							KVM_MP_STATE_RUNNABLE;
			if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
				r = -EINTR;
		}

		if (r > 0) {
			if (dm_request_for_irq_injection(vcpu, kvm_run)) {
				r = -EINTR;
				kvm_run->exit_reason = KVM_EXIT_INTR;
				++vcpu->stat.request_irq_exits;
			}
			if (signal_pending(current)) {
				r = -EINTR;
				kvm_run->exit_reason = KVM_EXIT_INTR;
				++vcpu->stat.signal_exits;
			}
			if (need_resched()) {
				up_read(&vcpu->kvm->slots_lock);
				kvm_resched(vcpu);
				down_read(&vcpu->kvm->slots_lock);
			}
		}
3094 3095
	}

3096
	up_read(&vcpu->kvm->slots_lock);
3097 3098
	post_kvm_run_save(vcpu, kvm_run);

A
Avi Kivity 已提交
3099 3100
	vapic_exit(vcpu);

3101 3102 3103 3104 3105 3106 3107 3108 3109 3110
	return r;
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	int r;
	sigset_t sigsaved;

	vcpu_load(vcpu);

3111 3112 3113
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

3114
	if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
3115
		kvm_vcpu_block(vcpu);
3116
		clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
3117 3118
		r = -EAGAIN;
		goto out;
3119 3120 3121 3122
	}

	/* re-sync apic's tpr */
	if (!irqchip_in_kernel(vcpu->kvm))
3123
		kvm_set_cr8(vcpu, kvm_run->cr8);
3124

3125
	if (vcpu->arch.pio.cur_count) {
3126 3127 3128 3129 3130 3131 3132 3133 3134
		r = complete_pio(vcpu);
		if (r)
			goto out;
	}
#if CONFIG_HAS_IOMEM
	if (vcpu->mmio_needed) {
		memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
		vcpu->mmio_read_completed = 1;
		vcpu->mmio_needed = 0;
3135 3136

		down_read(&vcpu->kvm->slots_lock);
3137
		r = emulate_instruction(vcpu, kvm_run,
3138 3139
					vcpu->arch.mmio_fault_cr2, 0,
					EMULTYPE_NO_DECODE);
3140
		up_read(&vcpu->kvm->slots_lock);
3141 3142 3143 3144 3145 3146 3147 3148 3149
		if (r == EMULATE_DO_MMIO) {
			/*
			 * Read-modify-write.  Back to userspace.
			 */
			r = 0;
			goto out;
		}
	}
#endif
3150 3151 3152
	if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
		kvm_register_write(vcpu, VCPU_REGS_RAX,
				     kvm_run->hypercall.ret);
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167

	r = __vcpu_run(vcpu, kvm_run);

out:
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu_put(vcpu);
	return r;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	vcpu_load(vcpu);

3168 3169 3170 3171 3172 3173 3174 3175
	regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
	regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
	regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
	regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
	regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
	regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
	regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
	regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3176
#ifdef CONFIG_X86_64
3177 3178 3179 3180 3181 3182 3183 3184
	regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
	regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
	regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
	regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
	regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
	regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
	regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
	regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
3185 3186
#endif

3187
	regs->rip = kvm_rip_read(vcpu);
3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204
	regs->rflags = kvm_x86_ops->get_rflags(vcpu);

	/*
	 * Don't leak debug flags in case they were set for guest debugging
	 */
	if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
		regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);

	vcpu_put(vcpu);

	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	vcpu_load(vcpu);

3205 3206 3207 3208 3209 3210 3211 3212
	kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
	kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
	kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
	kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
	kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
	kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
	kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
	kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
3213
#ifdef CONFIG_X86_64
3214 3215 3216 3217 3218 3219 3220 3221 3222
	kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
	kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
	kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
	kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
	kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
	kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
	kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
	kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);

3223 3224
#endif

3225
	kvm_rip_write(vcpu, regs->rip);
3226 3227 3228
	kvm_x86_ops->set_rflags(vcpu, regs->rflags);


3229 3230
	vcpu->arch.exception.pending = false;

3231 3232 3233 3234 3235
	vcpu_put(vcpu);

	return 0;
}

3236 3237
void kvm_get_segment(struct kvm_vcpu *vcpu,
		     struct kvm_segment *var, int seg)
3238
{
3239
	kvm_x86_ops->get_segment(vcpu, var, seg);
3240 3241 3242 3243 3244 3245
}

void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
	struct kvm_segment cs;

3246
	kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259
	*db = cs.db;
	*l = cs.l;
}
EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	struct descriptor_table dt;
	int pending_vec;

	vcpu_load(vcpu);

3260 3261 3262 3263 3264 3265
	kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
	kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
	kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
	kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
	kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
	kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3266

3267 3268
	kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3269 3270 3271 3272 3273 3274 3275 3276 3277

	kvm_x86_ops->get_idt(vcpu, &dt);
	sregs->idt.limit = dt.limit;
	sregs->idt.base = dt.base;
	kvm_x86_ops->get_gdt(vcpu, &dt);
	sregs->gdt.limit = dt.limit;
	sregs->gdt.base = dt.base;

	kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3278 3279 3280 3281
	sregs->cr0 = vcpu->arch.cr0;
	sregs->cr2 = vcpu->arch.cr2;
	sregs->cr3 = vcpu->arch.cr3;
	sregs->cr4 = vcpu->arch.cr4;
3282
	sregs->cr8 = kvm_get_cr8(vcpu);
3283
	sregs->efer = vcpu->arch.shadow_efer;
3284 3285 3286 3287 3288 3289 3290 3291 3292 3293
	sregs->apic_base = kvm_get_apic_base(vcpu);

	if (irqchip_in_kernel(vcpu->kvm)) {
		memset(sregs->interrupt_bitmap, 0,
		       sizeof sregs->interrupt_bitmap);
		pending_vec = kvm_x86_ops->get_irq(vcpu);
		if (pending_vec >= 0)
			set_bit(pending_vec,
				(unsigned long *)sregs->interrupt_bitmap);
	} else
3294
		memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3295 3296 3297 3298 3299 3300 3301
		       sizeof sregs->interrupt_bitmap);

	vcpu_put(vcpu);

	return 0;
}

3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	vcpu_load(vcpu);
	mp_state->mp_state = vcpu->arch.mp_state;
	vcpu_put(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	vcpu_load(vcpu);
	vcpu->arch.mp_state = mp_state->mp_state;
	vcpu_put(vcpu);
	return 0;
}

3320
static void kvm_set_segment(struct kvm_vcpu *vcpu,
3321 3322
			struct kvm_segment *var, int seg)
{
3323
	kvm_x86_ops->set_segment(vcpu, var, seg);
3324 3325
}

3326 3327 3328 3329 3330 3331 3332 3333
static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
				   struct kvm_segment *kvm_desct)
{
	kvm_desct->base = seg_desc->base0;
	kvm_desct->base |= seg_desc->base1 << 16;
	kvm_desct->base |= seg_desc->base2 << 24;
	kvm_desct->limit = seg_desc->limit0;
	kvm_desct->limit |= seg_desc->limit << 16;
3334 3335 3336 3337
	if (seg_desc->g) {
		kvm_desct->limit <<= 12;
		kvm_desct->limit |= 0xfff;
	}
3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
	kvm_desct->selector = selector;
	kvm_desct->type = seg_desc->type;
	kvm_desct->present = seg_desc->p;
	kvm_desct->dpl = seg_desc->dpl;
	kvm_desct->db = seg_desc->d;
	kvm_desct->s = seg_desc->s;
	kvm_desct->l = seg_desc->l;
	kvm_desct->g = seg_desc->g;
	kvm_desct->avl = seg_desc->avl;
	if (!selector)
		kvm_desct->unusable = 1;
	else
		kvm_desct->unusable = 0;
	kvm_desct->padding = 0;
}

A
Amit Shah 已提交
3354 3355 3356
static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
					  u16 selector,
					  struct descriptor_table *dtable)
3357 3358 3359 3360
{
	if (selector & 1 << 2) {
		struct kvm_segment kvm_seg;

3361
		kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376

		if (kvm_seg.unusable)
			dtable->limit = 0;
		else
			dtable->limit = kvm_seg.limit;
		dtable->base = kvm_seg.base;
	}
	else
		kvm_x86_ops->get_gdt(vcpu, dtable);
}

/* allowed just for 8 bytes segments */
static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
					 struct desc_struct *seg_desc)
{
3377
	gpa_t gpa;
3378 3379 3380
	struct descriptor_table dtable;
	u16 index = selector >> 3;

A
Amit Shah 已提交
3381
	get_segment_descriptor_dtable(vcpu, selector, &dtable);
3382 3383 3384 3385 3386

	if (dtable.limit < index * 8 + 7) {
		kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
		return 1;
	}
3387 3388 3389
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
	gpa += index * 8;
	return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
3390 3391 3392 3393 3394 3395
}

/* allowed just for 8 bytes segments */
static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
					 struct desc_struct *seg_desc)
{
3396
	gpa_t gpa;
3397 3398 3399
	struct descriptor_table dtable;
	u16 index = selector >> 3;

A
Amit Shah 已提交
3400
	get_segment_descriptor_dtable(vcpu, selector, &dtable);
3401 3402 3403

	if (dtable.limit < index * 8 + 7)
		return 1;
3404 3405 3406
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
	gpa += index * 8;
	return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417
}

static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
			     struct desc_struct *seg_desc)
{
	u32 base_addr;

	base_addr = seg_desc->base0;
	base_addr |= (seg_desc->base1 << 16);
	base_addr |= (seg_desc->base2 << 24);

3418
	return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
3419 3420 3421 3422 3423 3424
}

static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_segment kvm_seg;

3425
	kvm_get_segment(vcpu, &kvm_seg, seg);
3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440
	return kvm_seg.selector;
}

static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
						u16 selector,
						struct kvm_segment *kvm_seg)
{
	struct desc_struct seg_desc;

	if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
		return 1;
	seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
	return 0;
}

3441
static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460
{
	struct kvm_segment segvar = {
		.base = selector << 4,
		.limit = 0xffff,
		.selector = selector,
		.type = 3,
		.present = 1,
		.dpl = 3,
		.db = 0,
		.s = 1,
		.l = 0,
		.g = 0,
		.avl = 0,
		.unusable = 0,
	};
	kvm_x86_ops->set_segment(vcpu, &segvar, seg);
	return 0;
}

3461 3462
int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
				int type_bits, int seg)
3463 3464 3465
{
	struct kvm_segment kvm_seg;

3466 3467
	if (!(vcpu->arch.cr0 & X86_CR0_PE))
		return kvm_load_realmode_segment(vcpu, selector, seg);
3468 3469 3470 3471 3472 3473 3474 3475 3476
	if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
		return 1;
	kvm_seg.type |= type_bits;

	if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
	    seg != VCPU_SREG_LDTR)
		if (!kvm_seg.s)
			kvm_seg.unusable = 1;

3477
	kvm_set_segment(vcpu, &kvm_seg, seg);
3478 3479 3480 3481 3482 3483 3484
	return 0;
}

static void save_state_to_tss32(struct kvm_vcpu *vcpu,
				struct tss_segment_32 *tss)
{
	tss->cr3 = vcpu->arch.cr3;
3485
	tss->eip = kvm_rip_read(vcpu);
3486
	tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3487 3488 3489 3490 3491 3492 3493 3494
	tss->eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
	tss->ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
	tss->edx = kvm_register_read(vcpu, VCPU_REGS_RDX);
	tss->ebx = kvm_register_read(vcpu, VCPU_REGS_RBX);
	tss->esp = kvm_register_read(vcpu, VCPU_REGS_RSP);
	tss->ebp = kvm_register_read(vcpu, VCPU_REGS_RBP);
	tss->esi = kvm_register_read(vcpu, VCPU_REGS_RSI);
	tss->edi = kvm_register_read(vcpu, VCPU_REGS_RDI);
3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509
	tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
	tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
	tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
	tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
	tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
	tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
	tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
	tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
}

static int load_state_from_tss32(struct kvm_vcpu *vcpu,
				  struct tss_segment_32 *tss)
{
	kvm_set_cr3(vcpu, tss->cr3);

3510
	kvm_rip_write(vcpu, tss->eip);
3511 3512
	kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);

3513 3514 3515 3516 3517 3518 3519 3520
	kvm_register_write(vcpu, VCPU_REGS_RAX, tss->eax);
	kvm_register_write(vcpu, VCPU_REGS_RCX, tss->ecx);
	kvm_register_write(vcpu, VCPU_REGS_RDX, tss->edx);
	kvm_register_write(vcpu, VCPU_REGS_RBX, tss->ebx);
	kvm_register_write(vcpu, VCPU_REGS_RSP, tss->esp);
	kvm_register_write(vcpu, VCPU_REGS_RBP, tss->ebp);
	kvm_register_write(vcpu, VCPU_REGS_RSI, tss->esi);
	kvm_register_write(vcpu, VCPU_REGS_RDI, tss->edi);
3521

3522
	if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3523 3524
		return 1;

3525
	if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3526 3527
		return 1;

3528
	if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3529 3530
		return 1;

3531
	if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3532 3533
		return 1;

3534
	if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3535 3536
		return 1;

3537
	if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3538 3539
		return 1;

3540
	if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3541 3542 3543 3544 3545 3546 3547
		return 1;
	return 0;
}

static void save_state_to_tss16(struct kvm_vcpu *vcpu,
				struct tss_segment_16 *tss)
{
3548
	tss->ip = kvm_rip_read(vcpu);
3549
	tss->flag = kvm_x86_ops->get_rflags(vcpu);
3550 3551 3552 3553 3554 3555 3556 3557
	tss->ax = kvm_register_read(vcpu, VCPU_REGS_RAX);
	tss->cx = kvm_register_read(vcpu, VCPU_REGS_RCX);
	tss->dx = kvm_register_read(vcpu, VCPU_REGS_RDX);
	tss->bx = kvm_register_read(vcpu, VCPU_REGS_RBX);
	tss->sp = kvm_register_read(vcpu, VCPU_REGS_RSP);
	tss->bp = kvm_register_read(vcpu, VCPU_REGS_RBP);
	tss->si = kvm_register_read(vcpu, VCPU_REGS_RSI);
	tss->di = kvm_register_read(vcpu, VCPU_REGS_RDI);
3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569

	tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
	tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
	tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
	tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
	tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
	tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
}

static int load_state_from_tss16(struct kvm_vcpu *vcpu,
				 struct tss_segment_16 *tss)
{
3570
	kvm_rip_write(vcpu, tss->ip);
3571
	kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3572 3573 3574 3575 3576 3577 3578 3579
	kvm_register_write(vcpu, VCPU_REGS_RAX, tss->ax);
	kvm_register_write(vcpu, VCPU_REGS_RCX, tss->cx);
	kvm_register_write(vcpu, VCPU_REGS_RDX, tss->dx);
	kvm_register_write(vcpu, VCPU_REGS_RBX, tss->bx);
	kvm_register_write(vcpu, VCPU_REGS_RSP, tss->sp);
	kvm_register_write(vcpu, VCPU_REGS_RBP, tss->bp);
	kvm_register_write(vcpu, VCPU_REGS_RSI, tss->si);
	kvm_register_write(vcpu, VCPU_REGS_RDI, tss->di);
3580

3581
	if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3582 3583
		return 1;

3584
	if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3585 3586
		return 1;

3587
	if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3588 3589
		return 1;

3590
	if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3591 3592
		return 1;

3593
	if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3594 3595 3596 3597
		return 1;
	return 0;
}

3598
static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3599
		       u32 old_tss_base,
3600 3601 3602 3603 3604
		       struct desc_struct *nseg_desc)
{
	struct tss_segment_16 tss_segment_16;
	int ret = 0;

3605 3606
	if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
			   sizeof tss_segment_16))
3607 3608 3609 3610
		goto out;

	save_state_to_tss16(vcpu, &tss_segment_16);

3611 3612
	if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
			    sizeof tss_segment_16))
3613
		goto out;
3614 3615 3616 3617 3618

	if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
			   &tss_segment_16, sizeof tss_segment_16))
		goto out;

3619 3620 3621 3622 3623 3624 3625 3626
	if (load_state_from_tss16(vcpu, &tss_segment_16))
		goto out;

	ret = 1;
out:
	return ret;
}

3627
static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3628
		       u32 old_tss_base,
3629 3630 3631 3632 3633
		       struct desc_struct *nseg_desc)
{
	struct tss_segment_32 tss_segment_32;
	int ret = 0;

3634 3635
	if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
			   sizeof tss_segment_32))
3636 3637 3638 3639
		goto out;

	save_state_to_tss32(vcpu, &tss_segment_32);

3640 3641 3642 3643 3644 3645
	if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
			    sizeof tss_segment_32))
		goto out;

	if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
			   &tss_segment_32, sizeof tss_segment_32))
3646
		goto out;
3647

3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
	if (load_state_from_tss32(vcpu, &tss_segment_32))
		goto out;

	ret = 1;
out:
	return ret;
}

int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
{
	struct kvm_segment tr_seg;
	struct desc_struct cseg_desc;
	struct desc_struct nseg_desc;
	int ret = 0;
3662 3663
	u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
	u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
3664

3665
	old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
3666

3667 3668 3669
	/* FIXME: Handle errors. Failure to read either TSS or their
	 * descriptors should generate a pagefault.
	 */
3670 3671 3672
	if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
		goto out;

3673
	if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691
		goto out;

	if (reason != TASK_SWITCH_IRET) {
		int cpl;

		cpl = kvm_x86_ops->get_cpl(vcpu);
		if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
			kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
			return 1;
		}
	}

	if (!nseg_desc.p || (nseg_desc.limit0 | nseg_desc.limit << 16) < 0x67) {
		kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
		return 1;
	}

	if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
3692
		cseg_desc.type &= ~(1 << 1); //clear the B flag
3693
		save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
3694 3695 3696 3697 3698 3699 3700 3701 3702 3703
	}

	if (reason == TASK_SWITCH_IRET) {
		u32 eflags = kvm_x86_ops->get_rflags(vcpu);
		kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
	}

	kvm_x86_ops->skip_emulated_instruction(vcpu);

	if (nseg_desc.type & 8)
3704
		ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_base,
3705 3706
					 &nseg_desc);
	else
3707
		ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_base,
3708 3709 3710 3711 3712 3713 3714 3715
					 &nseg_desc);

	if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
		u32 eflags = kvm_x86_ops->get_rflags(vcpu);
		kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
	}

	if (reason != TASK_SWITCH_IRET) {
3716
		nseg_desc.type |= (1 << 1);
3717 3718 3719 3720 3721 3722 3723
		save_guest_segment_descriptor(vcpu, tss_selector,
					      &nseg_desc);
	}

	kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
	seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
	tr_seg.type = 11;
3724
	kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3725 3726 3727 3728 3729
out:
	return ret;
}
EXPORT_SYMBOL_GPL(kvm_task_switch);

3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	int mmu_reset_needed = 0;
	int i, pending_vec, max_bits;
	struct descriptor_table dt;

	vcpu_load(vcpu);

	dt.limit = sregs->idt.limit;
	dt.base = sregs->idt.base;
	kvm_x86_ops->set_idt(vcpu, &dt);
	dt.limit = sregs->gdt.limit;
	dt.base = sregs->gdt.base;
	kvm_x86_ops->set_gdt(vcpu, &dt);

3746 3747 3748
	vcpu->arch.cr2 = sregs->cr2;
	mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
	vcpu->arch.cr3 = sregs->cr3;
3749

3750
	kvm_set_cr8(vcpu, sregs->cr8);
3751

3752
	mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3753 3754 3755 3756 3757
	kvm_x86_ops->set_efer(vcpu, sregs->efer);
	kvm_set_apic_base(vcpu, sregs->apic_base);

	kvm_x86_ops->decache_cr4_guest_bits(vcpu);

3758
	mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3759
	kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3760
	vcpu->arch.cr0 = sregs->cr0;
3761

3762
	mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3763 3764
	kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
	if (!is_long_mode(vcpu) && is_pae(vcpu))
3765
		load_pdptrs(vcpu, vcpu->arch.cr3);
3766 3767 3768 3769 3770

	if (mmu_reset_needed)
		kvm_mmu_reset_context(vcpu);

	if (!irqchip_in_kernel(vcpu->kvm)) {
3771 3772 3773 3774 3775 3776
		memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
		       sizeof vcpu->arch.irq_pending);
		vcpu->arch.irq_summary = 0;
		for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
			if (vcpu->arch.irq_pending[i])
				__set_bit(i, &vcpu->arch.irq_summary);
3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787
	} else {
		max_bits = (sizeof sregs->interrupt_bitmap) << 3;
		pending_vec = find_first_bit(
			(const unsigned long *)sregs->interrupt_bitmap,
			max_bits);
		/* Only pending external irq is handled here */
		if (pending_vec < max_bits) {
			kvm_x86_ops->set_irq(vcpu, pending_vec);
			pr_debug("Set back pending irq %d\n",
				 pending_vec);
		}
M
Marcelo Tosatti 已提交
3788
		kvm_pic_clear_isr_ack(vcpu->kvm);
3789 3790
	}

3791 3792 3793 3794 3795 3796
	kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
	kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
	kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
	kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
	kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
	kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3797

3798 3799
	kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3800

M
Marcelo Tosatti 已提交
3801 3802 3803 3804 3805 3806
	/* Older userspace won't unhalt the vcpu on reset. */
	if (vcpu->vcpu_id == 0 && kvm_rip_read(vcpu) == 0xfff0 &&
	    sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
	    !(vcpu->arch.cr0 & X86_CR0_PE))
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;

3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825
	vcpu_put(vcpu);

	return 0;
}

int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
				    struct kvm_debug_guest *dbg)
{
	int r;

	vcpu_load(vcpu);

	r = kvm_x86_ops->set_guest_debug(vcpu, dbg);

	vcpu_put(vcpu);

	return r;
}

3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846
/*
 * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
 * we have asm/x86/processor.h
 */
struct fxsave {
	u16	cwd;
	u16	swd;
	u16	twd;
	u16	fop;
	u64	rip;
	u64	rdp;
	u32	mxcsr;
	u32	mxcsr_mask;
	u32	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
#ifdef CONFIG_X86_64
	u32	xmm_space[64];	/* 16*16 bytes for each XMM-reg = 256 bytes */
#else
	u32	xmm_space[32];	/* 8*16 bytes for each XMM-reg = 128 bytes */
#endif
};

3847 3848 3849 3850 3851 3852 3853 3854 3855 3856
/*
 * Translate a guest virtual address to a guest physical address.
 */
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				    struct kvm_translation *tr)
{
	unsigned long vaddr = tr->linear_address;
	gpa_t gpa;

	vcpu_load(vcpu);
3857
	down_read(&vcpu->kvm->slots_lock);
3858
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
3859
	up_read(&vcpu->kvm->slots_lock);
3860 3861 3862 3863 3864 3865 3866 3867 3868
	tr->physical_address = gpa;
	tr->valid = gpa != UNMAPPED_GVA;
	tr->writeable = 1;
	tr->usermode = 0;
	vcpu_put(vcpu);

	return 0;
}

3869 3870
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
3871
	struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890

	vcpu_load(vcpu);

	memcpy(fpu->fpr, fxsave->st_space, 128);
	fpu->fcw = fxsave->cwd;
	fpu->fsw = fxsave->swd;
	fpu->ftwx = fxsave->twd;
	fpu->last_opcode = fxsave->fop;
	fpu->last_ip = fxsave->rip;
	fpu->last_dp = fxsave->rdp;
	memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);

	vcpu_put(vcpu);

	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
3891
	struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912

	vcpu_load(vcpu);

	memcpy(fxsave->st_space, fpu->fpr, 128);
	fxsave->cwd = fpu->fcw;
	fxsave->swd = fpu->fsw;
	fxsave->twd = fpu->ftwx;
	fxsave->fop = fpu->last_opcode;
	fxsave->rip = fpu->last_ip;
	fxsave->rdp = fpu->last_dp;
	memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);

	vcpu_put(vcpu);

	return 0;
}

void fx_init(struct kvm_vcpu *vcpu)
{
	unsigned after_mxcsr_mask;

3913 3914 3915 3916 3917 3918 3919
	/*
	 * Touch the fpu the first time in non atomic context as if
	 * this is the first fpu instruction the exception handler
	 * will fire before the instruction returns and it'll have to
	 * allocate ram with GFP_KERNEL.
	 */
	if (!used_math())
3920
		kvm_fx_save(&vcpu->arch.host_fx_image);
3921

3922 3923
	/* Initialize guest FPU by resetting ours and saving into guest's */
	preempt_disable();
3924 3925 3926 3927
	kvm_fx_save(&vcpu->arch.host_fx_image);
	kvm_fx_finit();
	kvm_fx_save(&vcpu->arch.guest_fx_image);
	kvm_fx_restore(&vcpu->arch.host_fx_image);
3928 3929
	preempt_enable();

3930
	vcpu->arch.cr0 |= X86_CR0_ET;
3931
	after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3932 3933
	vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
	memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3934 3935 3936 3937 3938 3939 3940 3941 3942 3943
	       0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
}
EXPORT_SYMBOL_GPL(fx_init);

void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
		return;

	vcpu->guest_fpu_loaded = 1;
3944 3945
	kvm_fx_save(&vcpu->arch.host_fx_image);
	kvm_fx_restore(&vcpu->arch.guest_fx_image);
3946 3947 3948 3949 3950 3951 3952 3953 3954
}
EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);

void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
{
	if (!vcpu->guest_fpu_loaded)
		return;

	vcpu->guest_fpu_loaded = 0;
3955 3956
	kvm_fx_save(&vcpu->arch.guest_fx_image);
	kvm_fx_restore(&vcpu->arch.host_fx_image);
A
Avi Kivity 已提交
3957
	++vcpu->stat.fpu_reload;
3958 3959
}
EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3960 3961 3962 3963 3964 3965 3966 3967 3968

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
	kvm_x86_ops->vcpu_free(vcpu);
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
						unsigned int id)
{
3969 3970
	return kvm_x86_ops->vcpu_create(kvm, id);
}
3971

3972 3973 3974
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	int r;
3975 3976

	/* We do fxsave: this must be aligned. */
3977
	BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3978

S
Sheng Yang 已提交
3979
	vcpu->arch.mtrr_state.have_fixed = 1;
3980 3981 3982 3983 3984 3985 3986 3987
	vcpu_load(vcpu);
	r = kvm_arch_vcpu_reset(vcpu);
	if (r == 0)
		r = kvm_mmu_setup(vcpu);
	vcpu_put(vcpu);
	if (r < 0)
		goto free_vcpu;

3988
	return 0;
3989 3990
free_vcpu:
	kvm_x86_ops->vcpu_free(vcpu);
3991
	return r;
3992 3993
}

3994
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3995 3996 3997 3998 3999 4000 4001 4002 4003 4004
{
	vcpu_load(vcpu);
	kvm_mmu_unload(vcpu);
	vcpu_put(vcpu);

	kvm_x86_ops->vcpu_free(vcpu);
}

int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
{
4005 4006 4007
	vcpu->arch.nmi_pending = false;
	vcpu->arch.nmi_injected = false;

4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044
	return kvm_x86_ops->vcpu_reset(vcpu);
}

void kvm_arch_hardware_enable(void *garbage)
{
	kvm_x86_ops->hardware_enable(garbage);
}

void kvm_arch_hardware_disable(void *garbage)
{
	kvm_x86_ops->hardware_disable(garbage);
}

int kvm_arch_hardware_setup(void)
{
	return kvm_x86_ops->hardware_setup();
}

void kvm_arch_hardware_unsetup(void)
{
	kvm_x86_ops->hardware_unsetup();
}

void kvm_arch_check_processor_compat(void *rtn)
{
	kvm_x86_ops->check_processor_compatibility(rtn);
}

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
	struct page *page;
	struct kvm *kvm;
	int r;

	BUG_ON(vcpu->kvm == NULL);
	kvm = vcpu->kvm;

4045
	vcpu->arch.mmu.root_hpa = INVALID_PAGE;
4046
	if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
4047
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4048
	else
4049
		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
4050 4051 4052 4053 4054 4055

	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	if (!page) {
		r = -ENOMEM;
		goto fail;
	}
4056
	vcpu->arch.pio_data = page_address(page);
4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072

	r = kvm_mmu_create(vcpu);
	if (r < 0)
		goto fail_free_pio_data;

	if (irqchip_in_kernel(kvm)) {
		r = kvm_create_lapic(vcpu);
		if (r < 0)
			goto fail_mmu_destroy;
	}

	return 0;

fail_mmu_destroy:
	kvm_mmu_destroy(vcpu);
fail_free_pio_data:
4073
	free_page((unsigned long)vcpu->arch.pio_data);
4074 4075 4076 4077 4078 4079 4080
fail:
	return r;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
	kvm_free_lapic(vcpu);
4081
	down_read(&vcpu->kvm->slots_lock);
4082
	kvm_mmu_destroy(vcpu);
4083
	up_read(&vcpu->kvm->slots_lock);
4084
	free_page((unsigned long)vcpu->arch.pio_data);
4085
}
4086 4087 4088 4089 4090 4091 4092 4093

struct  kvm *kvm_arch_create_vm(void)
{
	struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);

	if (!kvm)
		return ERR_PTR(-ENOMEM);

4094
	INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
4095
	INIT_LIST_HEAD(&kvm->arch.oos_global_pages);
B
Ben-Ami Yassour 已提交
4096
	INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
4097

4098 4099 4100
	/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
	set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);

4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129
	return kvm;
}

static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
{
	vcpu_load(vcpu);
	kvm_mmu_unload(vcpu);
	vcpu_put(vcpu);
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;

	/*
	 * Unpin any mmu pages first.
	 */
	for (i = 0; i < KVM_MAX_VCPUS; ++i)
		if (kvm->vcpus[i])
			kvm_unload_vcpu_mmu(kvm->vcpus[i]);
	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		if (kvm->vcpus[i]) {
			kvm_arch_vcpu_free(kvm->vcpus[i]);
			kvm->vcpus[i] = NULL;
		}
	}

}

4130 4131
void kvm_arch_sync_events(struct kvm *kvm)
{
4132
	kvm_free_all_assigned_devices(kvm);
4133 4134
}

4135 4136
void kvm_arch_destroy_vm(struct kvm *kvm)
{
4137
	kvm_iommu_unmap_guest(kvm);
S
Sheng Yang 已提交
4138
	kvm_free_pit(kvm);
4139 4140
	kfree(kvm->arch.vpic);
	kfree(kvm->arch.vioapic);
4141 4142
	kvm_free_vcpus(kvm);
	kvm_free_physmem(kvm);
4143 4144
	if (kvm->arch.apic_access_page)
		put_page(kvm->arch.apic_access_page);
4145 4146
	if (kvm->arch.ept_identity_pagetable)
		put_page(kvm->arch.ept_identity_pagetable);
4147 4148
	kfree(kvm);
}
4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162

int kvm_arch_set_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem,
				struct kvm_memory_slot old,
				int user_alloc)
{
	int npages = mem->memory_size >> PAGE_SHIFT;
	struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];

	/*To keep backward compatibility with older userspace,
	 *x86 needs to hanlde !user_alloc case.
	 */
	if (!user_alloc) {
		if (npages && !old.rmap) {
4163 4164
			unsigned long userspace_addr;

4165
			down_write(&current->mm->mmap_sem);
4166 4167 4168
			userspace_addr = do_mmap(NULL, 0,
						 npages * PAGE_SIZE,
						 PROT_READ | PROT_WRITE,
4169
						 MAP_PRIVATE | MAP_ANONYMOUS,
4170
						 0);
4171
			up_write(&current->mm->mmap_sem);
4172

4173 4174 4175 4176 4177 4178 4179
			if (IS_ERR((void *)userspace_addr))
				return PTR_ERR((void *)userspace_addr);

			/* set userspace_addr atomically for kvm_hva_to_rmapp */
			spin_lock(&kvm->mmu_lock);
			memslot->userspace_addr = userspace_addr;
			spin_unlock(&kvm->mmu_lock);
4180 4181 4182 4183
		} else {
			if (!old.user_alloc && old.rmap) {
				int ret;

4184
				down_write(&current->mm->mmap_sem);
4185 4186
				ret = do_munmap(current->mm, old.userspace_addr,
						old.npages * PAGE_SIZE);
4187
				up_write(&current->mm->mmap_sem);
4188 4189 4190 4191 4192 4193 4194 4195
				if (ret < 0)
					printk(KERN_WARNING
				       "kvm_vm_ioctl_set_memory_region: "
				       "failed to munmap memory\n");
			}
		}
	}

4196
	if (!kvm->arch.n_requested_mmu_pages) {
4197 4198 4199 4200 4201 4202 4203 4204 4205
		unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
		kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
	}

	kvm_mmu_slot_remove_write_access(kvm, mem->slot);
	kvm_flush_remote_tlbs(kvm);

	return 0;
}
4206

4207 4208 4209 4210 4211
void kvm_arch_flush_shadow(struct kvm *kvm)
{
	kvm_mmu_zap_all(kvm);
}

4212 4213
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
4214
	return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4215 4216
	       || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
	       || vcpu->arch.nmi_pending;
4217
}
4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229

static void vcpu_kick_intr(void *info)
{
#ifdef DEBUG
	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
	printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
#endif
}

void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
{
	int ipi_pcpu = vcpu->cpu;
4230
	int cpu = get_cpu();
4231 4232 4233 4234 4235

	if (waitqueue_active(&vcpu->wq)) {
		wake_up_interruptible(&vcpu->wq);
		++vcpu->stat.halt_wakeup;
	}
4236 4237 4238 4239 4240
	/*
	 * We may be called synchronously with irqs disabled in guest mode,
	 * So need not to call smp_call_function_single() in that case.
	 */
	if (vcpu->guest_mode && vcpu->cpu != cpu)
4241
		smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
4242
	put_cpu();
4243
}