x86.c 102.6 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/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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	{ "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_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_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",
581
		 __func__, tsc_khz, hv_clock->tsc_shift,
582 583 584
		 hv_clock->tsc_to_system_mul);
}

585 586 587 588 589 590 591 592 593 594
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;

595 596 597 598 599
	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;
	}

600 601 602 603 604 605 606 607 608 609 610 611 612 613
	/* 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
614
	 * state, we just increase by 2 at the end.
615
	 */
616
	vcpu->hv_clock.version += 2;
617 618 619 620

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

	memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
621
	       sizeof(vcpu->hv_clock));
622 623 624 625 626 627

	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;
}
688 689 690 691 692 693 694 695 696

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",
697
		       __func__, data);
698 699 700
		break;
	case MSR_IA32_MCG_STATUS:
		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
701
			__func__, data);
702
		break;
703 704
	case MSR_IA32_MCG_CTL:
		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
705
			__func__, data);
706
		break;
707 708 709 710 711 712 713 714 715 716 717 718
	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;
719 720 721
	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);
724 725 726 727
	case MSR_IA32_APICBASE:
		kvm_set_apic_base(vcpu, data);
		break;
	case MSR_IA32_MISC_ENABLE:
728
		vcpu->arch.ia32_misc_enable_msr = data;
729
		break;
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
	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;
	}
760
	default:
761
		pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
		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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	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)
		*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;
}

815 816 817 818 819 820 821 822 823 824 825 826 827
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:
828
	case MSR_IA32_MCG_CTL:
829 830 831 832 833
	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:
835 836
	case MSR_IA32_UCODE_REV:
	case MSR_IA32_EBL_CR_POWERON:
837 838 839 840 841
	case MSR_IA32_DEBUGCTLMSR:
	case MSR_IA32_LASTBRANCHFROMIP:
	case MSR_IA32_LASTBRANCHTOIP:
	case MSR_IA32_LASTINTFROMIP:
	case MSR_IA32_LASTINTTOIP:
842 843
		data = 0;
		break;
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Avi Kivity 已提交
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	case MSR_MTRRcap:
		data = 0x500 | KVM_NR_VAR_MTRR;
		break;
	case 0x200 ... 0x2ff:
		return get_msr_mtrr(vcpu, msr, pdata);
849 850 851 852 853 854 855
	case 0xcd: /* fsb frequency */
		data = 3;
		break;
	case MSR_IA32_APICBASE:
		data = kvm_get_apic_base(vcpu);
		break;
	case MSR_IA32_MISC_ENABLE:
856
		data = vcpu->arch.ia32_misc_enable_msr;
857
		break;
858 859 860 861 862 863
	case MSR_IA32_PERF_STATUS:
		/* TSC increment by tick */
		data = 1000ULL;
		/* CPU multiplier */
		data |= (((uint64_t)4ULL) << 40);
		break;
864
	case MSR_EFER:
865
		data = vcpu->arch.shadow_efer;
866
		break;
867 868 869 870 871 872
	case MSR_KVM_WALL_CLOCK:
		data = vcpu->kvm->arch.wall_clock;
		break;
	case MSR_KVM_SYSTEM_TIME:
		data = vcpu->arch.time;
		break;
873 874 875 876 877 878 879 880 881
	default:
		pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
		return 1;
	}
	*pdata = data;
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_msr_common);

882 883 884 885 886 887 888 889 890 891 892 893 894 895
/*
 * 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);

896
	down_read(&vcpu->kvm->slots_lock);
897 898 899
	for (i = 0; i < msrs->nmsrs; ++i)
		if (do_msr(vcpu, entries[i].index, &entries[i].data))
			break;
900
	up_read(&vcpu->kvm->slots_lock);
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955

	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;
}

956 957 958 959 960 961 962 963 964 965
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_USER_MEMORY:
	case KVM_CAP_SET_TSS_ADDR:
966
	case KVM_CAP_EXT_CPUID:
967
	case KVM_CAP_CLOCKSOURCE:
S
Sheng Yang 已提交
968
	case KVM_CAP_PIT:
969
	case KVM_CAP_NOP_IO_DELAY:
970
	case KVM_CAP_MP_STATE:
971
	case KVM_CAP_SYNC_MMU:
972 973
		r = 1;
		break;
974 975 976
	case KVM_CAP_COALESCED_MMIO:
		r = KVM_COALESCED_MMIO_PAGE_OFFSET;
		break;
977 978 979
	case KVM_CAP_VAPIC:
		r = !kvm_x86_ops->cpu_has_accelerated_tpr();
		break;
980 981 982
	case KVM_CAP_NR_VCPUS:
		r = KVM_MAX_VCPUS;
		break;
983 984 985
	case KVM_CAP_NR_MEMSLOTS:
		r = KVM_MEMORY_SLOTS;
		break;
986 987 988
	case KVM_CAP_PV_MMU:
		r = !tdp_enabled;
		break;
B
Ben-Ami Yassour 已提交
989 990 991
	case KVM_CAP_IOMMU:
		r = intel_iommu_found();
		break;
992 993 994 995 996 997 998 999
	default:
		r = 0;
		break;
	}
	return r;

}

1000 1001 1002 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
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;
	}
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	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;
	}
1052 1053 1054 1055 1056 1057 1058
	default:
		r = -EINVAL;
	}
out:
	return r;
}

1059 1060 1061
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	kvm_x86_ops->vcpu_load(vcpu, cpu);
1062
	kvm_write_guest_time(vcpu);
1063 1064 1065 1066 1067
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	kvm_x86_ops->vcpu_put(vcpu);
1068
	kvm_put_guest_fpu(vcpu);
1069 1070
}

1071
static int is_efer_nx(void)
1072 1073 1074 1075
{
	u64 efer;

	rdmsrl(MSR_EFER, efer);
1076 1077 1078 1079 1080 1081 1082 1083
	return efer & EFER_NX;
}

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

1084
	entry = NULL;
1085 1086
	for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
		e = &vcpu->arch.cpuid_entries[i];
1087 1088 1089 1090 1091
		if (e->function == 0x80000001) {
			entry = e;
			break;
		}
	}
1092
	if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1093 1094 1095 1096 1097
		entry->edx &= ~(1 << 20);
		printk(KERN_INFO "kvm: guest NX capability removed\n");
	}
}

1098
/* when an old userspace process fills a new kernel module */
1099 1100 1101
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
				    struct kvm_cpuid *cpuid,
				    struct kvm_cpuid_entry __user *entries)
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
{
	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++) {
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
		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;
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
	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)
1142 1143 1144 1145 1146 1147 1148
{
	int r;

	r = -E2BIG;
	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
		goto out;
	r = -EFAULT;
1149
	if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1150
			   cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1151
		goto out;
1152
	vcpu->arch.cpuid_nent = cpuid->nent;
1153 1154 1155 1156 1157 1158
	return 0;

out:
	return r;
}

1159 1160 1161 1162 1163 1164 1165
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;
1166
	if (cpuid->nent < vcpu->arch.cpuid_nent)
1167 1168
		goto out;
	r = -EFAULT;
1169 1170
	if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
			   vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1171 1172 1173 1174
		goto out;
	return 0;

out:
1175
	cpuid->nent = vcpu->arch.cpuid_nent;
1176 1177 1178 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 1252 1253 1254 1255 1256 1257
	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;
		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: {
1258
		int i, cache_type;
1259 1260 1261

		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
		/* read more entries until cache_type is zero */
1262 1263
		for (i = 1; *nent < maxnent; ++i) {
			cache_type = entry[i - 1].eax & 0x1f;
1264 1265
			if (!cache_type)
				break;
1266 1267
			do_cpuid_1_ent(&entry[i], function, i);
			entry[i].flags |=
1268 1269 1270 1271 1272 1273
			       KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
			++*nent;
		}
		break;
	}
	case 0xb: {
1274
		int i, level_type;
1275 1276 1277

		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
		/* read more entries until level_type is zero */
1278 1279
		for (i = 1; *nent < maxnent; ++i) {
			level_type = entry[i - 1].ecx & 0xff;
1280 1281
			if (!level_type)
				break;
1282 1283
			do_cpuid_1_ent(&entry[i], function, i);
			entry[i].flags |=
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
			       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();
}

1300
static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1301 1302 1303 1304 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
				    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;
}

1341 1342 1343 1344
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
				    struct kvm_lapic_state *s)
{
	vcpu_load(vcpu);
1345
	memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1346 1347 1348 1349 1350 1351 1352 1353 1354
	vcpu_put(vcpu);

	return 0;
}

static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
				    struct kvm_lapic_state *s)
{
	vcpu_load(vcpu);
1355
	memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1356 1357 1358 1359 1360 1361
	kvm_apic_post_state_restore(vcpu);
	vcpu_put(vcpu);

	return 0;
}

1362 1363 1364 1365 1366 1367 1368 1369 1370
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);

1371 1372
	set_bit(irq->irq, vcpu->arch.irq_pending);
	set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1373 1374 1375 1376 1377 1378

	vcpu_put(vcpu);

	return 0;
}

1379 1380 1381 1382 1383 1384 1385 1386 1387
static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
{
	vcpu_load(vcpu);
	kvm_inject_nmi(vcpu);
	vcpu_put(vcpu);

	return 0;
}

1388 1389 1390 1391 1392 1393 1394 1395 1396
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;
}

1397 1398 1399 1400 1401 1402
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;
1403
	struct kvm_lapic_state *lapic = NULL;
1404 1405 1406

	switch (ioctl) {
	case KVM_GET_LAPIC: {
1407
		lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1408

1409 1410 1411 1412
		r = -ENOMEM;
		if (!lapic)
			goto out;
		r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
1413 1414 1415
		if (r)
			goto out;
		r = -EFAULT;
1416
		if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
1417 1418 1419 1420 1421
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_LAPIC: {
1422 1423 1424 1425
		lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
		r = -ENOMEM;
		if (!lapic)
			goto out;
1426
		r = -EFAULT;
1427
		if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
1428
			goto out;
1429
		r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
1430 1431 1432 1433 1434
		if (r)
			goto out;
		r = 0;
		break;
	}
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	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;
	}
1447 1448 1449 1450 1451 1452 1453
	case KVM_NMI: {
		r = kvm_vcpu_ioctl_nmi(vcpu);
		if (r)
			goto out;
		r = 0;
		break;
	}
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	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;
	}
1466 1467 1468 1469 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
	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;
	}
1496 1497 1498 1499 1500 1501
	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;
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
	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
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
	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;
	}
1530 1531 1532 1533
	default:
		r = -EINVAL;
	}
out:
1534 1535
	if (lapic)
		kfree(lapic);
1536 1537 1538
	return r;
}

1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
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;

1555
	down_write(&kvm->slots_lock);
1556 1557

	kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1558
	kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1559

1560
	up_write(&kvm->slots_lock);
1561 1562 1563 1564 1565
	return 0;
}

static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
{
1566
	return kvm->arch.n_alloc_mmu_pages;
1567 1568
}

1569 1570 1571 1572 1573
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
	int i;
	struct kvm_mem_alias *alias;

1574 1575
	for (i = 0; i < kvm->arch.naliases; ++i) {
		alias = &kvm->arch.aliases[i];
1576 1577 1578 1579 1580 1581 1582
		if (gfn >= alias->base_gfn
		    && gfn < alias->base_gfn + alias->npages)
			return alias->target_gfn + gfn - alias->base_gfn;
	}
	return gfn;
}

1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
/*
 * 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;

1609
	down_write(&kvm->slots_lock);
1610
	spin_lock(&kvm->mmu_lock);
1611

1612
	p = &kvm->arch.aliases[alias->slot];
1613 1614 1615 1616 1617
	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)
1618
		if (kvm->arch.aliases[n - 1].npages)
1619
			break;
1620
	kvm->arch.naliases = n;
1621

1622
	spin_unlock(&kvm->mmu_lock);
1623 1624
	kvm_mmu_zap_all(kvm);

1625
	up_write(&kvm->slots_lock);
1626 1627 1628 1629 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

	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;
}

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
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;
}

1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
/*
 * 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;

1718
	down_write(&kvm->slots_lock);
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733

	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:
1734
	up_write(&kvm->slots_lock);
1735 1736 1737
	return r;
}

1738 1739 1740 1741 1742 1743
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;
1744 1745 1746 1747 1748 1749 1750 1751 1752
	/*
	 * 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;
1753 1754 1755 1756 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

	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;
1784
	case KVM_SET_MEMORY_ALIAS:
1785
		r = -EFAULT;
1786
		if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
1787
			goto out;
1788
		r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
1789 1790 1791 1792 1793
		if (r)
			goto out;
		break;
	case KVM_CREATE_IRQCHIP:
		r = -ENOMEM;
1794 1795
		kvm->arch.vpic = kvm_create_pic(kvm);
		if (kvm->arch.vpic) {
1796 1797
			r = kvm_ioapic_init(kvm);
			if (r) {
1798 1799
				kfree(kvm->arch.vpic);
				kvm->arch.vpic = NULL;
1800 1801 1802 1803 1804
				goto out;
			}
		} else
			goto out;
		break;
S
Sheng Yang 已提交
1805 1806 1807 1808 1809 1810
	case KVM_CREATE_PIT:
		r = -ENOMEM;
		kvm->arch.vpit = kvm_create_pit(kvm);
		if (kvm->arch.vpit)
			r = 0;
		break;
1811 1812 1813 1814 1815 1816 1817 1818
	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);
1819 1820
			kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
				    irq_event.irq, irq_event.level);
1821 1822 1823 1824 1825 1826 1827
			mutex_unlock(&kvm->lock);
			r = 0;
		}
		break;
	}
	case KVM_GET_IRQCHIP: {
		/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1828
		struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1829

1830 1831
		r = -ENOMEM;
		if (!chip)
1832
			goto out;
1833 1834 1835
		r = -EFAULT;
		if (copy_from_user(chip, argp, sizeof *chip))
			goto get_irqchip_out;
1836 1837
		r = -ENXIO;
		if (!irqchip_in_kernel(kvm))
1838 1839
			goto get_irqchip_out;
		r = kvm_vm_ioctl_get_irqchip(kvm, chip);
1840
		if (r)
1841
			goto get_irqchip_out;
1842
		r = -EFAULT;
1843 1844
		if (copy_to_user(argp, chip, sizeof *chip))
			goto get_irqchip_out;
1845
		r = 0;
1846 1847 1848 1849
	get_irqchip_out:
		kfree(chip);
		if (r)
			goto out;
1850 1851 1852 1853
		break;
	}
	case KVM_SET_IRQCHIP: {
		/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1854
		struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1855

1856 1857
		r = -ENOMEM;
		if (!chip)
1858
			goto out;
1859 1860 1861
		r = -EFAULT;
		if (copy_from_user(chip, argp, sizeof *chip))
			goto set_irqchip_out;
1862 1863
		r = -ENXIO;
		if (!irqchip_in_kernel(kvm))
1864 1865
			goto set_irqchip_out;
		r = kvm_vm_ioctl_set_irqchip(kvm, chip);
1866
		if (r)
1867
			goto set_irqchip_out;
1868
		r = 0;
1869 1870 1871 1872
	set_irqchip_out:
		kfree(chip);
		if (r)
			goto out;
1873 1874
		break;
	}
1875 1876
	case KVM_GET_PIT: {
		r = -EFAULT;
1877
		if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
1878 1879 1880 1881
			goto out;
		r = -ENXIO;
		if (!kvm->arch.vpit)
			goto out;
1882
		r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
1883 1884 1885
		if (r)
			goto out;
		r = -EFAULT;
1886
		if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
1887 1888 1889 1890 1891 1892
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_PIT: {
		r = -EFAULT;
1893
		if (copy_from_user(&u.ps, argp, sizeof u.ps))
1894 1895 1896 1897
			goto out;
		r = -ENXIO;
		if (!kvm->arch.vpit)
			goto out;
1898
		r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
1899 1900 1901 1902 1903
		if (r)
			goto out;
		r = 0;
		break;
	}
1904 1905 1906 1907 1908 1909 1910
	default:
		;
	}
out:
	return r;
}

1911
static void kvm_init_msr_list(void)
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925
{
	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;
}

1926 1927 1928 1929
/*
 * Only apic need an MMIO device hook, so shortcut now..
 */
static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1930 1931
						gpa_t addr, int len,
						int is_write)
1932 1933 1934
{
	struct kvm_io_device *dev;

1935 1936
	if (vcpu->arch.apic) {
		dev = &vcpu->arch.apic->dev;
1937
		if (dev->in_range(dev, addr, len, is_write))
1938 1939 1940 1941 1942 1943 1944
			return dev;
	}
	return NULL;
}


static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1945 1946
						gpa_t addr, int len,
						int is_write)
1947 1948 1949
{
	struct kvm_io_device *dev;

1950
	dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
1951
	if (dev == NULL)
1952 1953
		dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
					  is_write);
1954 1955 1956 1957 1958 1959 1960 1961 1962
	return dev;
}

int emulator_read_std(unsigned long addr,
			     void *val,
			     unsigned int bytes,
			     struct kvm_vcpu *vcpu)
{
	void *data = val;
1963
	int r = X86EMUL_CONTINUE;
1964 1965

	while (bytes) {
1966
		gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
1967 1968 1969 1970
		unsigned offset = addr & (PAGE_SIZE-1);
		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
		int ret;

1971 1972 1973 1974
		if (gpa == UNMAPPED_GVA) {
			r = X86EMUL_PROPAGATE_FAULT;
			goto out;
		}
1975
		ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1976 1977 1978 1979
		if (ret < 0) {
			r = X86EMUL_UNHANDLEABLE;
			goto out;
		}
1980 1981 1982 1983 1984

		bytes -= tocopy;
		data += tocopy;
		addr += tocopy;
	}
1985 1986
out:
	return r;
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
}
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;
	}

2004
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

	/* 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?
	 */
2020
	mutex_lock(&vcpu->kvm->lock);
2021
	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
2022 2023
	if (mmio_dev) {
		kvm_iodevice_read(mmio_dev, gpa, bytes, val);
2024
		mutex_unlock(&vcpu->kvm->lock);
2025 2026
		return X86EMUL_CONTINUE;
	}
2027
	mutex_unlock(&vcpu->kvm->lock);
2028 2029 2030 2031 2032 2033 2034 2035 2036

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

	return X86EMUL_UNHANDLEABLE;
}

2037
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
2038
			  const void *val, int bytes)
2039 2040 2041 2042
{
	int ret;

	ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
2043
	if (ret < 0)
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
		return 0;
	kvm_mmu_pte_write(vcpu, gpa, val, bytes);
	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;
2055 2056 2057
	gpa_t                 gpa;

	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2058 2059

	if (gpa == UNMAPPED_GVA) {
2060
		kvm_inject_page_fault(vcpu, addr, 2);
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
		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?
	 */
2075
	mutex_lock(&vcpu->kvm->lock);
2076
	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
2077 2078
	if (mmio_dev) {
		kvm_iodevice_write(mmio_dev, gpa, bytes, val);
2079
		mutex_unlock(&vcpu->kvm->lock);
2080 2081
		return X86EMUL_CONTINUE;
	}
2082
	mutex_unlock(&vcpu->kvm->lock);
2083 2084 2085 2086 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

	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");
	}
2126 2127 2128
#ifndef CONFIG_X86_64
	/* guests cmpxchg8b have to be emulated atomically */
	if (bytes == 8) {
2129
		gpa_t gpa;
2130
		struct page *page;
A
Andrew Morton 已提交
2131
		char *kaddr;
2132 2133
		u64 val;

2134 2135
		gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);

2136 2137 2138 2139 2140 2141 2142 2143
		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;
2144

2145
		page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2146

A
Andrew Morton 已提交
2147 2148 2149
		kaddr = kmap_atomic(page, KM_USER0);
		set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
		kunmap_atomic(kaddr, KM_USER0);
2150 2151
		kvm_release_page_dirty(page);
	}
2152
emul_write:
2153 2154
#endif

2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
	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
2165
	kvm_mmu_invlpg(vcpu, address);
2166 2167 2168 2169 2170
	return X86EMUL_CONTINUE;
}

int emulate_clts(struct kvm_vcpu *vcpu)
{
J
Joerg Roedel 已提交
2171
	KVMTRACE_0D(CLTS, vcpu, handler);
2172
	kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184
	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:
2185
		pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205
		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];
2206
	unsigned long rip = kvm_rip_read(vcpu);
2207 2208
	unsigned long rip_linear;

2209
	if (!printk_ratelimit())
2210 2211
		return;

2212 2213
	rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);

2214 2215 2216 2217 2218 2219 2220
	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);

2221
static struct x86_emulate_ops emulate_ops = {
2222 2223 2224 2225 2226 2227
	.read_std            = emulator_read_std,
	.read_emulated       = emulator_read_emulated,
	.write_emulated      = emulator_write_emulated,
	.cmpxchg_emulated    = emulator_cmpxchg_emulated,
};

2228 2229 2230 2231 2232 2233 2234 2235
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;
}

2236 2237 2238 2239
int emulate_instruction(struct kvm_vcpu *vcpu,
			struct kvm_run *run,
			unsigned long cr2,
			u16 error_code,
2240
			int emulation_type)
2241 2242
{
	int r;
2243
	struct decode_cache *c;
2244

2245
	kvm_clear_exception_queue(vcpu);
2246
	vcpu->arch.mmio_fault_cr2 = cr2;
2247 2248 2249 2250 2251 2252 2253
	/*
	 * 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);
2254 2255

	vcpu->mmio_is_write = 0;
2256
	vcpu->arch.pio.string = 0;
2257

2258
	if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2259 2260 2261
		int cs_db, cs_l;
		kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);

2262 2263 2264 2265
		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)
2266 2267 2268 2269
			? X86EMUL_MODE_REAL : cs_l
			? X86EMUL_MODE_PROT64 :	cs_db
			? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;

2270
		r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280

		/* 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;

2281
		++vcpu->stat.insn_emulation;
2282
		if (r)  {
2283
			++vcpu->stat.insn_emulation_fail;
2284 2285 2286 2287 2288 2289
			if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
				return EMULATE_DONE;
			return EMULATE_FAIL;
		}
	}

2290
	r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2291

2292
	if (vcpu->arch.pio.string)
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
		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;
	}

2313
	kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323

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

	return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(emulate_instruction);

2324 2325 2326 2327
static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
{
	int i;

2328 2329 2330 2331
	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;
2332 2333 2334 2335 2336
		}
}

static int pio_copy_data(struct kvm_vcpu *vcpu)
{
2337
	void *p = vcpu->arch.pio_data;
2338 2339
	void *q;
	unsigned bytes;
2340
	int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1;
2341

2342
	q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
2343 2344 2345 2346 2347
		 PAGE_KERNEL);
	if (!q) {
		free_pio_guest_pages(vcpu);
		return -ENOMEM;
	}
2348 2349 2350
	q += vcpu->arch.pio.guest_page_offset;
	bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
	if (vcpu->arch.pio.in)
2351 2352 2353
		memcpy(q, p, bytes);
	else
		memcpy(p, q, bytes);
2354
	q -= vcpu->arch.pio.guest_page_offset;
2355 2356 2357 2358 2359 2360 2361
	vunmap(q);
	free_pio_guest_pages(vcpu);
	return 0;
}

int complete_pio(struct kvm_vcpu *vcpu)
{
2362
	struct kvm_pio_request *io = &vcpu->arch.pio;
2363 2364
	long delta;
	int r;
2365
	unsigned long val;
2366 2367

	if (!io->string) {
2368 2369 2370 2371 2372
		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);
		}
2373 2374 2375
	} else {
		if (io->in) {
			r = pio_copy_data(vcpu);
2376
			if (r)
2377 2378 2379 2380 2381 2382 2383 2384 2385 2386
				return r;
		}

		delta = 1;
		if (io->rep) {
			delta *= io->cur_count;
			/*
			 * The size of the register should really depend on
			 * current address size.
			 */
2387 2388 2389
			val = kvm_register_read(vcpu, VCPU_REGS_RCX);
			val -= delta;
			kvm_register_write(vcpu, VCPU_REGS_RCX, val);
2390 2391 2392 2393
		}
		if (io->down)
			delta = -delta;
		delta *= io->size;
2394 2395 2396 2397 2398 2399 2400 2401 2402
		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);
		}
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417
	}

	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);
2418 2419 2420
	if (vcpu->arch.pio.in)
		kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
				  vcpu->arch.pio.size,
2421 2422
				  pd);
	else
2423 2424
		kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
				   vcpu->arch.pio.size,
2425 2426 2427 2428 2429 2430 2431
				   pd);
	mutex_unlock(&vcpu->kvm->lock);
}

static void pio_string_write(struct kvm_io_device *pio_dev,
			     struct kvm_vcpu *vcpu)
{
2432 2433
	struct kvm_pio_request *io = &vcpu->arch.pio;
	void *pd = vcpu->arch.pio_data;
2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
	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,
2447 2448
					       gpa_t addr, int len,
					       int is_write)
2449
{
2450
	return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
2451 2452 2453 2454 2455 2456
}

int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
		  int size, unsigned port)
{
	struct kvm_io_device *pio_dev;
2457
	unsigned long val;
2458 2459 2460

	vcpu->run->exit_reason = KVM_EXIT_IO;
	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2461
	vcpu->run->io.size = vcpu->arch.pio.size = size;
2462
	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2463 2464 2465 2466 2467 2468 2469
	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;
2470

F
Feng (Eric) Liu 已提交
2471 2472 2473 2474 2475 2476 2477
	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);

2478 2479
	val = kvm_register_read(vcpu, VCPU_REGS_RAX);
	memcpy(vcpu->arch.pio_data, &val, 4);
2480

2481
	pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
2482
	if (pio_dev) {
2483
		kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502
		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;
2503
	vcpu->run->io.size = vcpu->arch.pio.size = size;
2504
	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2505 2506 2507 2508 2509 2510 2511
	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;
2512

F
Feng (Eric) Liu 已提交
2513 2514 2515 2516 2517 2518 2519
	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);

2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
	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");
2544
		kvm_inject_gp(vcpu, 0);
2545 2546 2547
		return 1;
	}
	vcpu->run->io.count = now;
2548
	vcpu->arch.pio.cur_count = now;
2549

2550
	if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2551 2552 2553 2554
		kvm_x86_ops->skip_emulated_instruction(vcpu);

	for (i = 0; i < nr_pages; ++i) {
		page = gva_to_page(vcpu, address + i * PAGE_SIZE);
2555
		vcpu->arch.pio.guest_pages[i] = page;
2556
		if (!page) {
2557
			kvm_inject_gp(vcpu, 0);
2558 2559 2560 2561 2562
			free_pio_guest_pages(vcpu);
			return 1;
		}
	}

2563 2564 2565
	pio_dev = vcpu_find_pio_dev(vcpu, port,
				    vcpu->arch.pio.cur_count,
				    !vcpu->arch.pio.in);
2566
	if (!vcpu->arch.pio.in) {
2567 2568 2569 2570 2571
		/* string PIO write */
		ret = pio_copy_data(vcpu);
		if (ret >= 0 && pio_dev) {
			pio_string_write(pio_dev, vcpu);
			complete_pio(vcpu);
2572
			if (vcpu->arch.pio.count == 0)
2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
				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);

2584
int kvm_arch_init(void *opaque)
2585
{
2586
	int r;
2587 2588 2589 2590
	struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;

	if (kvm_x86_ops) {
		printk(KERN_ERR "kvm: already loaded the other module\n");
2591 2592
		r = -EEXIST;
		goto out;
2593 2594 2595 2596
	}

	if (!ops->cpu_has_kvm_support()) {
		printk(KERN_ERR "kvm: no hardware support\n");
2597 2598
		r = -EOPNOTSUPP;
		goto out;
2599 2600 2601
	}
	if (ops->disabled_by_bios()) {
		printk(KERN_ERR "kvm: disabled by bios\n");
2602 2603
		r = -EOPNOTSUPP;
		goto out;
2604 2605
	}

2606 2607 2608 2609 2610 2611
	r = kvm_mmu_module_init();
	if (r)
		goto out;

	kvm_init_msr_list();

2612
	kvm_x86_ops = ops;
2613
	kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
S
Sheng Yang 已提交
2614 2615
	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
2616
			PT_DIRTY_MASK, PT64_NX_MASK, 0, 0);
2617
	return 0;
2618 2619 2620

out:
	return r;
2621
}
2622

2623 2624 2625
void kvm_arch_exit(void)
{
	kvm_x86_ops = NULL;
2626 2627
	kvm_mmu_module_exit();
}
2628

2629 2630 2631
int kvm_emulate_halt(struct kvm_vcpu *vcpu)
{
	++vcpu->stat.halt_exits;
F
Feng (Eric) Liu 已提交
2632
	KVMTRACE_0D(HLT, vcpu, handler);
2633
	if (irqchip_in_kernel(vcpu->kvm)) {
2634
		vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2635 2636 2637 2638 2639 2640 2641 2642
		return 1;
	} else {
		vcpu->run->exit_reason = KVM_EXIT_HLT;
		return 0;
	}
}
EXPORT_SYMBOL_GPL(kvm_emulate_halt);

2643 2644 2645 2646 2647 2648 2649 2650 2651
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);
}

2652 2653 2654
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
{
	unsigned long nr, a0, a1, a2, a3, ret;
2655
	int r = 1;
2656

2657 2658 2659 2660 2661
	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);
2662

F
Feng (Eric) Liu 已提交
2663 2664
	KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);

2665 2666 2667 2668 2669 2670 2671 2672 2673
	if (!is_long_mode(vcpu)) {
		nr &= 0xFFFFFFFF;
		a0 &= 0xFFFFFFFF;
		a1 &= 0xFFFFFFFF;
		a2 &= 0xFFFFFFFF;
		a3 &= 0xFFFFFFFF;
	}

	switch (nr) {
A
Avi Kivity 已提交
2674 2675 2676
	case KVM_HC_VAPIC_POLL_IRQ:
		ret = 0;
		break;
2677 2678 2679
	case KVM_HC_MMU_OP:
		r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
		break;
2680 2681 2682 2683
	default:
		ret = -KVM_ENOSYS;
		break;
	}
2684
	kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
A
Amit Shah 已提交
2685
	++vcpu->stat.hypercalls;
2686
	return r;
2687 2688 2689 2690 2691 2692 2693
}
EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);

int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
{
	char instruction[3];
	int ret = 0;
2694
	unsigned long rip = kvm_rip_read(vcpu);
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704


	/*
	 * 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);
2705
	if (emulator_write_emulated(rip, instruction, 3, vcpu)
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733
	    != 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)
{
2734
	kvm_lmsw(vcpu, msw);
2735 2736 2737 2738 2739
	*rflags = kvm_x86_ops->get_rflags(vcpu);
}

unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
{
J
Joerg Roedel 已提交
2740 2741
	unsigned long value;

2742 2743 2744
	kvm_x86_ops->decache_cr4_guest_bits(vcpu);
	switch (cr) {
	case 0:
J
Joerg Roedel 已提交
2745 2746
		value = vcpu->arch.cr0;
		break;
2747
	case 2:
J
Joerg Roedel 已提交
2748 2749
		value = vcpu->arch.cr2;
		break;
2750
	case 3:
J
Joerg Roedel 已提交
2751 2752
		value = vcpu->arch.cr3;
		break;
2753
	case 4:
J
Joerg Roedel 已提交
2754 2755
		value = vcpu->arch.cr4;
		break;
2756
	case 8:
J
Joerg Roedel 已提交
2757 2758
		value = kvm_get_cr8(vcpu);
		break;
2759
	default:
2760
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2761 2762
		return 0;
	}
J
Joerg Roedel 已提交
2763 2764 2765 2766
	KVMTRACE_3D(CR_READ, vcpu, (u32)cr, (u32)value,
		    (u32)((u64)value >> 32), handler);

	return value;
2767 2768 2769 2770 2771
}

void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
		     unsigned long *rflags)
{
J
Joerg Roedel 已提交
2772 2773 2774
	KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)val,
		    (u32)((u64)val >> 32), handler);

2775 2776
	switch (cr) {
	case 0:
2777
		kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2778 2779 2780
		*rflags = kvm_x86_ops->get_rflags(vcpu);
		break;
	case 2:
2781
		vcpu->arch.cr2 = val;
2782 2783
		break;
	case 3:
2784
		kvm_set_cr3(vcpu, val);
2785 2786
		break;
	case 4:
2787
		kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2788
		break;
2789
	case 8:
2790
		kvm_set_cr8(vcpu, val & 0xfUL);
2791
		break;
2792
	default:
2793
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2794 2795 2796
	}
}

2797 2798
static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
{
2799 2800
	struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
	int j, nent = vcpu->arch.cpuid_nent;
2801 2802 2803 2804

	e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
	/* when no next entry is found, the current entry[i] is reselected */
	for (j = i + 1; j == i; j = (j + 1) % nent) {
2805
		struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
		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;
}

2829 2830 2831
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
{
	int i;
2832 2833
	u32 function, index;
	struct kvm_cpuid_entry2 *e, *best;
2834

2835 2836 2837 2838 2839 2840
	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);
2841
	best = NULL;
2842 2843
	for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
		e = &vcpu->arch.cpuid_entries[i];
2844 2845 2846
		if (is_matching_cpuid_entry(e, function, index)) {
			if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
				move_to_next_stateful_cpuid_entry(vcpu, i);
2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857
			best = e;
			break;
		}
		/*
		 * Both basic or both extended?
		 */
		if (((e->function ^ function) & 0x80000000) == 0)
			if (!best || e->function > best->function)
				best = e;
	}
	if (best) {
2858 2859 2860 2861
		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);
2862 2863
	}
	kvm_x86_ops->skip_emulated_instruction(vcpu);
F
Feng (Eric) Liu 已提交
2864
	KVMTRACE_5D(CPUID, vcpu, function,
2865 2866 2867 2868
		    (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);
2869 2870
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2871

2872 2873 2874 2875 2876 2877 2878 2879 2880
/*
 * 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)
{
2881
	return (!vcpu->arch.irq_summary &&
2882
		kvm_run->request_interrupt_window &&
2883
		vcpu->arch.interrupt_window_open &&
2884 2885 2886
		(kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
}

2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900
/*
 * Check if userspace requested a NMI window, and that the NMI window
 * is open.
 *
 * No need to exit to userspace if we already have a NMI queued.
 */
static int dm_request_for_nmi_injection(struct kvm_vcpu *vcpu,
					struct kvm_run *kvm_run)
{
	return (!vcpu->arch.nmi_pending &&
		kvm_run->request_nmi_window &&
		vcpu->arch.nmi_window_open);
}

2901 2902 2903 2904
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;
2905
	kvm_run->cr8 = kvm_get_cr8(vcpu);
2906
	kvm_run->apic_base = kvm_get_apic_base(vcpu);
2907
	if (irqchip_in_kernel(vcpu->kvm)) {
2908
		kvm_run->ready_for_interrupt_injection = 1;
2909 2910
		kvm_run->ready_for_nmi_injection = 1;
	} else {
2911
		kvm_run->ready_for_interrupt_injection =
2912 2913
					(vcpu->arch.interrupt_window_open &&
					 vcpu->arch.irq_summary == 0);
2914 2915 2916 2917
		kvm_run->ready_for_nmi_injection =
					(vcpu->arch.nmi_window_open &&
					 vcpu->arch.nmi_pending == 0);
	}
2918 2919
}

A
Avi Kivity 已提交
2920 2921 2922 2923 2924 2925 2926 2927 2928
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);
2929 2930

	vcpu->arch.apic->vapic_page = page;
A
Avi Kivity 已提交
2931 2932 2933 2934 2935 2936 2937 2938 2939
}

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

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

2940
	down_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2941 2942
	kvm_release_page_dirty(apic->vapic_page);
	mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
2943
	up_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2944 2945
}

2946
static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2947 2948 2949
{
	int r;

2950 2951 2952 2953
	if (vcpu->requests)
		if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
			kvm_mmu_unload(vcpu);

2954 2955 2956 2957
	r = kvm_mmu_reload(vcpu);
	if (unlikely(r))
		goto out;

2958 2959
	if (vcpu->requests) {
		if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
M
Marcelo Tosatti 已提交
2960
			__kvm_migrate_timers(vcpu);
2961 2962
		if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
			kvm_mmu_sync_roots(vcpu);
2963 2964
		if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
			kvm_x86_ops->tlb_flush(vcpu);
A
Avi Kivity 已提交
2965 2966 2967 2968 2969 2970
		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
2971 2972 2973 2974 2975
		if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
			kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
			r = 0;
			goto out;
		}
2976
	}
A
Avi Kivity 已提交
2977

2978
	clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
2979 2980 2981 2982 2983 2984 2985 2986 2987
	kvm_inject_pending_timer_irqs(vcpu);

	preempt_disable();

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

	local_irq_disable();

2988
	if (vcpu->requests || need_resched() || signal_pending(current)) {
2989 2990 2991 2992 2993 2994
		local_irq_enable();
		preempt_enable();
		r = 1;
		goto out;
	}

2995 2996
	if (vcpu->guest_debug.enabled)
		kvm_x86_ops->guest_debug_pre(vcpu);
2997

2998 2999 3000 3001 3002 3003 3004
	vcpu->guest_mode = 1;
	/*
	 * Make sure that guest_mode assignment won't happen after
	 * testing the pending IRQ vector bitmap.
	 */
	smp_wmb();

3005
	if (vcpu->arch.exception.pending)
3006 3007
		__queue_exception(vcpu);
	else if (irqchip_in_kernel(vcpu->kvm))
3008
		kvm_x86_ops->inject_pending_irq(vcpu);
3009
	else
3010 3011
		kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);

A
Avi Kivity 已提交
3012 3013
	kvm_lapic_sync_to_vapic(vcpu);

3014 3015
	up_read(&vcpu->kvm->slots_lock);

3016 3017 3018
	kvm_guest_enter();


F
Feng (Eric) Liu 已提交
3019
	KVMTRACE_0D(VMENTRY, vcpu, entryexit);
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038
	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();

3039 3040
	down_read(&vcpu->kvm->slots_lock);

3041 3042 3043 3044
	/*
	 * Profile KVM exit RIPs:
	 */
	if (unlikely(prof_on == KVM_PROFILING)) {
3045 3046
		unsigned long rip = kvm_rip_read(vcpu);
		profile_hit(KVM_PROFILING, (void *)rip);
3047 3048
	}

3049 3050
	if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
		vcpu->arch.exception.pending = false;
3051

A
Avi Kivity 已提交
3052 3053
	kvm_lapic_sync_from_vapic(vcpu);

3054
	r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
3055 3056 3057
out:
	return r;
}
3058

3059 3060 3061 3062 3063
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)) {
3064 3065
		pr_debug("vcpu %d received sipi with vector # %x\n",
			 vcpu->vcpu_id, vcpu->arch.sipi_vector);
3066
		kvm_lapic_reset(vcpu);
3067
		r = kvm_arch_vcpu_reset(vcpu);
3068 3069 3070
		if (r)
			return r;
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3071 3072
	}

3073 3074 3075 3076 3077
	down_read(&vcpu->kvm->slots_lock);
	vapic_enter(vcpu);

	r = 1;
	while (r > 0) {
3078
		if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
			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) {
3093 3094 3095 3096 3097
			if (dm_request_for_nmi_injection(vcpu, kvm_run)) {
				r = -EINTR;
				kvm_run->exit_reason = KVM_EXIT_NMI;
				++vcpu->stat.request_nmi_exits;
			}
3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113
			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);
			}
		}
3114 3115
	}

3116
	up_read(&vcpu->kvm->slots_lock);
3117 3118
	post_kvm_run_save(vcpu, kvm_run);

A
Avi Kivity 已提交
3119 3120
	vapic_exit(vcpu);

3121 3122 3123 3124 3125 3126 3127 3128 3129 3130
	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);

3131 3132 3133
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

3134
	if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
3135
		kvm_vcpu_block(vcpu);
3136
		clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
3137 3138
		r = -EAGAIN;
		goto out;
3139 3140 3141 3142
	}

	/* re-sync apic's tpr */
	if (!irqchip_in_kernel(vcpu->kvm))
3143
		kvm_set_cr8(vcpu, kvm_run->cr8);
3144

3145
	if (vcpu->arch.pio.cur_count) {
3146 3147 3148 3149 3150 3151 3152 3153 3154
		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;
3155 3156

		down_read(&vcpu->kvm->slots_lock);
3157
		r = emulate_instruction(vcpu, kvm_run,
3158 3159
					vcpu->arch.mmio_fault_cr2, 0,
					EMULTYPE_NO_DECODE);
3160
		up_read(&vcpu->kvm->slots_lock);
3161 3162 3163 3164 3165 3166 3167 3168 3169
		if (r == EMULATE_DO_MMIO) {
			/*
			 * Read-modify-write.  Back to userspace.
			 */
			r = 0;
			goto out;
		}
	}
#endif
3170 3171 3172
	if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
		kvm_register_write(vcpu, VCPU_REGS_RAX,
				     kvm_run->hypercall.ret);
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187

	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);

3188 3189 3190 3191 3192 3193 3194 3195
	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);
3196
#ifdef CONFIG_X86_64
3197 3198 3199 3200 3201 3202 3203 3204
	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);
3205 3206
#endif

3207
	regs->rip = kvm_rip_read(vcpu);
3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
	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);

3225 3226 3227 3228 3229 3230 3231 3232
	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);
3233
#ifdef CONFIG_X86_64
3234 3235 3236 3237 3238 3239 3240 3241 3242
	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);

3243 3244
#endif

3245
	kvm_rip_write(vcpu, regs->rip);
3246 3247 3248
	kvm_x86_ops->set_rflags(vcpu, regs->rflags);


3249 3250
	vcpu->arch.exception.pending = false;

3251 3252 3253 3254 3255
	vcpu_put(vcpu);

	return 0;
}

3256 3257
void kvm_get_segment(struct kvm_vcpu *vcpu,
		     struct kvm_segment *var, int seg)
3258
{
3259
	kvm_x86_ops->get_segment(vcpu, var, seg);
3260 3261 3262 3263 3264 3265
}

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

3266
	kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279
	*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);

3280 3281 3282 3283 3284 3285
	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);
3286

3287 3288
	kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3289 3290 3291 3292 3293 3294 3295 3296 3297

	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);
3298 3299 3300 3301
	sregs->cr0 = vcpu->arch.cr0;
	sregs->cr2 = vcpu->arch.cr2;
	sregs->cr3 = vcpu->arch.cr3;
	sregs->cr4 = vcpu->arch.cr4;
3302
	sregs->cr8 = kvm_get_cr8(vcpu);
3303
	sregs->efer = vcpu->arch.shadow_efer;
3304 3305 3306 3307 3308 3309 3310 3311 3312 3313
	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
3314
		memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3315 3316 3317 3318 3319 3320 3321
		       sizeof sregs->interrupt_bitmap);

	vcpu_put(vcpu);

	return 0;
}

3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339
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;
}

3340
static void kvm_set_segment(struct kvm_vcpu *vcpu,
3341 3342
			struct kvm_segment *var, int seg)
{
3343
	kvm_x86_ops->set_segment(vcpu, var, seg);
3344 3345
}

3346 3347 3348 3349 3350 3351 3352 3353
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;
3354 3355 3356 3357
	if (seg_desc->g) {
		kvm_desct->limit <<= 12;
		kvm_desct->limit |= 0xfff;
	}
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373
	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
3374 3375 3376
static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
					  u16 selector,
					  struct descriptor_table *dtable)
3377 3378 3379 3380
{
	if (selector & 1 << 2) {
		struct kvm_segment kvm_seg;

3381
		kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396

		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)
{
3397
	gpa_t gpa;
3398 3399 3400
	struct descriptor_table dtable;
	u16 index = selector >> 3;

A
Amit Shah 已提交
3401
	get_segment_descriptor_dtable(vcpu, selector, &dtable);
3402 3403 3404 3405 3406

	if (dtable.limit < index * 8 + 7) {
		kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
		return 1;
	}
3407 3408 3409
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
	gpa += index * 8;
	return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
3410 3411 3412 3413 3414 3415
}

/* allowed just for 8 bytes segments */
static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
					 struct desc_struct *seg_desc)
{
3416
	gpa_t gpa;
3417 3418 3419
	struct descriptor_table dtable;
	u16 index = selector >> 3;

A
Amit Shah 已提交
3420
	get_segment_descriptor_dtable(vcpu, selector, &dtable);
3421 3422 3423

	if (dtable.limit < index * 8 + 7)
		return 1;
3424 3425 3426
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
	gpa += index * 8;
	return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437
}

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);

3438
	return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
3439 3440 3441 3442 3443 3444
}

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

3445
	kvm_get_segment(vcpu, &kvm_seg, seg);
3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460
	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;
}

3461
static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480
{
	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;
}

3481 3482
int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
				int type_bits, int seg)
3483 3484 3485
{
	struct kvm_segment kvm_seg;

3486 3487
	if (!(vcpu->arch.cr0 & X86_CR0_PE))
		return kvm_load_realmode_segment(vcpu, selector, seg);
3488 3489 3490 3491 3492 3493 3494 3495 3496
	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;

3497
	kvm_set_segment(vcpu, &kvm_seg, seg);
3498 3499 3500 3501 3502 3503 3504
	return 0;
}

static void save_state_to_tss32(struct kvm_vcpu *vcpu,
				struct tss_segment_32 *tss)
{
	tss->cr3 = vcpu->arch.cr3;
3505
	tss->eip = kvm_rip_read(vcpu);
3506
	tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3507 3508 3509 3510 3511 3512 3513 3514
	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);
3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529
	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);

3530
	kvm_rip_write(vcpu, tss->eip);
3531 3532
	kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);

3533 3534 3535 3536 3537 3538 3539 3540
	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);
3541

3542
	if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3543 3544
		return 1;

3545
	if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3546 3547
		return 1;

3548
	if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3549 3550
		return 1;

3551
	if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3552 3553
		return 1;

3554
	if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3555 3556
		return 1;

3557
	if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3558 3559
		return 1;

3560
	if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3561 3562 3563 3564 3565 3566 3567
		return 1;
	return 0;
}

static void save_state_to_tss16(struct kvm_vcpu *vcpu,
				struct tss_segment_16 *tss)
{
3568
	tss->ip = kvm_rip_read(vcpu);
3569
	tss->flag = kvm_x86_ops->get_rflags(vcpu);
3570 3571 3572 3573 3574 3575 3576 3577
	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);
3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589

	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)
{
3590
	kvm_rip_write(vcpu, tss->ip);
3591
	kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3592 3593 3594 3595 3596 3597 3598 3599
	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);
3600

3601
	if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3602 3603
		return 1;

3604
	if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3605 3606
		return 1;

3607
	if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3608 3609
		return 1;

3610
	if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3611 3612
		return 1;

3613
	if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3614 3615 3616 3617
		return 1;
	return 0;
}

3618
static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3619
		       u32 old_tss_base,
3620 3621 3622 3623 3624
		       struct desc_struct *nseg_desc)
{
	struct tss_segment_16 tss_segment_16;
	int ret = 0;

3625 3626
	if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
			   sizeof tss_segment_16))
3627 3628 3629 3630
		goto out;

	save_state_to_tss16(vcpu, &tss_segment_16);

3631 3632
	if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
			    sizeof tss_segment_16))
3633
		goto out;
3634 3635 3636 3637 3638

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

3639 3640 3641 3642 3643 3644 3645 3646
	if (load_state_from_tss16(vcpu, &tss_segment_16))
		goto out;

	ret = 1;
out:
	return ret;
}

3647
static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3648
		       u32 old_tss_base,
3649 3650 3651 3652 3653
		       struct desc_struct *nseg_desc)
{
	struct tss_segment_32 tss_segment_32;
	int ret = 0;

3654 3655
	if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
			   sizeof tss_segment_32))
3656 3657 3658 3659
		goto out;

	save_state_to_tss32(vcpu, &tss_segment_32);

3660 3661 3662 3663 3664 3665
	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))
3666
		goto out;
3667

3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
	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;
3682 3683
	u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
	u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
3684

3685
	old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
3686

3687 3688 3689
	/* FIXME: Handle errors. Failure to read either TSS or their
	 * descriptors should generate a pagefault.
	 */
3690 3691 3692
	if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
		goto out;

3693
	if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711
		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) {
3712
		cseg_desc.type &= ~(1 << 1); //clear the B flag
3713
		save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
3714 3715 3716 3717 3718 3719 3720 3721 3722 3723
	}

	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)
3724
		ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_base,
3725 3726
					 &nseg_desc);
	else
3727
		ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_base,
3728 3729 3730 3731 3732 3733 3734 3735
					 &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) {
3736
		nseg_desc.type |= (1 << 1);
3737 3738 3739 3740 3741 3742 3743
		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;
3744
	kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3745 3746 3747 3748 3749
out:
	return ret;
}
EXPORT_SYMBOL_GPL(kvm_task_switch);

3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765
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);

3766 3767 3768
	vcpu->arch.cr2 = sregs->cr2;
	mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
	vcpu->arch.cr3 = sregs->cr3;
3769

3770
	kvm_set_cr8(vcpu, sregs->cr8);
3771

3772
	mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3773 3774 3775 3776 3777
	kvm_x86_ops->set_efer(vcpu, sregs->efer);
	kvm_set_apic_base(vcpu, sregs->apic_base);

	kvm_x86_ops->decache_cr4_guest_bits(vcpu);

3778
	mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3779
	kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3780
	vcpu->arch.cr0 = sregs->cr0;
3781

3782
	mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3783 3784
	kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
	if (!is_long_mode(vcpu) && is_pae(vcpu))
3785
		load_pdptrs(vcpu, vcpu->arch.cr3);
3786 3787 3788 3789 3790

	if (mmu_reset_needed)
		kvm_mmu_reset_context(vcpu);

	if (!irqchip_in_kernel(vcpu->kvm)) {
3791 3792 3793 3794 3795 3796
		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);
3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807
	} 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
3808
		kvm_pic_clear_isr_ack(vcpu->kvm);
3809 3810
	}

3811 3812 3813 3814 3815 3816
	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);
3817

3818 3819
	kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3820

M
Marcelo Tosatti 已提交
3821 3822 3823 3824 3825 3826
	/* 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;

3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845
	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;
}

3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866
/*
 * 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
};

3867 3868 3869 3870 3871 3872 3873 3874 3875 3876
/*
 * 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);
3877
	down_read(&vcpu->kvm->slots_lock);
3878
	gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
3879
	up_read(&vcpu->kvm->slots_lock);
3880 3881 3882 3883 3884 3885 3886 3887 3888
	tr->physical_address = gpa;
	tr->valid = gpa != UNMAPPED_GVA;
	tr->writeable = 1;
	tr->usermode = 0;
	vcpu_put(vcpu);

	return 0;
}

3889 3890
int kvm_arch_vcpu_ioctl_get_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

	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)
{
3911
	struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932

	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;

3933 3934 3935 3936 3937 3938 3939
	/*
	 * 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())
3940
		kvm_fx_save(&vcpu->arch.host_fx_image);
3941

3942 3943
	/* Initialize guest FPU by resetting ours and saving into guest's */
	preempt_disable();
3944 3945 3946 3947
	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);
3948 3949
	preempt_enable();

3950
	vcpu->arch.cr0 |= X86_CR0_ET;
3951
	after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
3952 3953
	vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
	memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
3954 3955 3956 3957 3958 3959 3960 3961 3962 3963
	       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;
3964 3965
	kvm_fx_save(&vcpu->arch.host_fx_image);
	kvm_fx_restore(&vcpu->arch.guest_fx_image);
3966 3967 3968 3969 3970 3971 3972 3973 3974
}
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;
3975 3976
	kvm_fx_save(&vcpu->arch.guest_fx_image);
	kvm_fx_restore(&vcpu->arch.host_fx_image);
A
Avi Kivity 已提交
3977
	++vcpu->stat.fpu_reload;
3978 3979
}
EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
3980 3981 3982 3983 3984 3985 3986 3987 3988

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)
{
3989 3990
	return kvm_x86_ops->vcpu_create(kvm, id);
}
3991

3992 3993 3994
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	int r;
3995 3996

	/* We do fxsave: this must be aligned. */
3997
	BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
3998

S
Sheng Yang 已提交
3999
	vcpu->arch.mtrr_state.have_fixed = 1;
4000 4001 4002 4003 4004 4005 4006 4007
	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;

4008
	return 0;
4009 4010
free_vcpu:
	kvm_x86_ops->vcpu_free(vcpu);
4011
	return r;
4012 4013
}

4014
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024
{
	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)
{
4025 4026 4027
	vcpu->arch.nmi_pending = false;
	vcpu->arch.nmi_injected = false;

4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064
	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;

4065
	vcpu->arch.mmu.root_hpa = INVALID_PAGE;
4066
	if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
4067
		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4068
	else
4069
		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
4070 4071 4072 4073 4074 4075

	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	if (!page) {
		r = -ENOMEM;
		goto fail;
	}
4076
	vcpu->arch.pio_data = page_address(page);
4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092

	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:
4093
	free_page((unsigned long)vcpu->arch.pio_data);
4094 4095 4096 4097 4098 4099 4100
fail:
	return r;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
	kvm_free_lapic(vcpu);
4101
	down_read(&vcpu->kvm->slots_lock);
4102
	kvm_mmu_destroy(vcpu);
4103
	up_read(&vcpu->kvm->slots_lock);
4104
	free_page((unsigned long)vcpu->arch.pio_data);
4105
}
4106 4107 4108 4109 4110 4111 4112 4113

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

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

4114
	INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
B
Ben-Ami Yassour 已提交
4115
	INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
4116

4117 4118 4119
	/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
	set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);

4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150
	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;
		}
	}

}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
4151
	kvm_free_all_assigned_devices(kvm);
4152
	kvm_iommu_unmap_guest(kvm);
S
Sheng Yang 已提交
4153
	kvm_free_pit(kvm);
4154 4155
	kfree(kvm->arch.vpic);
	kfree(kvm->arch.vioapic);
4156 4157
	kvm_free_vcpus(kvm);
	kvm_free_physmem(kvm);
4158 4159
	if (kvm->arch.apic_access_page)
		put_page(kvm->arch.apic_access_page);
4160 4161
	if (kvm->arch.ept_identity_pagetable)
		put_page(kvm->arch.ept_identity_pagetable);
4162 4163
	kfree(kvm);
}
4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177

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) {
4178 4179
			unsigned long userspace_addr;

4180
			down_write(&current->mm->mmap_sem);
4181 4182 4183
			userspace_addr = do_mmap(NULL, 0,
						 npages * PAGE_SIZE,
						 PROT_READ | PROT_WRITE,
4184
						 MAP_PRIVATE | MAP_ANONYMOUS,
4185
						 0);
4186
			up_write(&current->mm->mmap_sem);
4187

4188 4189 4190 4191 4192 4193 4194
			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);
4195 4196 4197 4198
		} else {
			if (!old.user_alloc && old.rmap) {
				int ret;

4199
				down_write(&current->mm->mmap_sem);
4200 4201
				ret = do_munmap(current->mm, old.userspace_addr,
						old.npages * PAGE_SIZE);
4202
				up_write(&current->mm->mmap_sem);
4203 4204 4205 4206 4207 4208 4209 4210
				if (ret < 0)
					printk(KERN_WARNING
				       "kvm_vm_ioctl_set_memory_region: "
				       "failed to munmap memory\n");
			}
		}
	}

4211
	if (!kvm->arch.n_requested_mmu_pages) {
4212 4213 4214 4215 4216 4217 4218 4219 4220
		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;
}
4221

4222 4223 4224 4225 4226
void kvm_arch_flush_shadow(struct kvm *kvm)
{
	kvm_mmu_zap_all(kvm);
}

4227 4228
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
4229
	return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4230 4231
	       || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
	       || vcpu->arch.nmi_pending;
4232
}
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244

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;
4245
	int cpu = get_cpu();
4246 4247 4248 4249 4250

	if (waitqueue_active(&vcpu->wq)) {
		wake_up_interruptible(&vcpu->wq);
		++vcpu->stat.halt_wakeup;
	}
4251 4252 4253 4254 4255
	/*
	 * 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)
4256
		smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
4257
	put_cpu();
4258
}