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[PATCH] KVM: MMU: Remove invlpg interception

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Since we write protect shadowed guest page tables, there is no need to trap
page invalidations (the guest will always change the mapping before issuing
the invlpg instruction).

Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Avi Kivity 2007-01-05 16:36:47 -08:00 committed by Linus Torvalds
parent ebeace8609
commit 5f015a5b28
5 changed files with 0 additions and 62 deletions
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1
drivers/kvm/kvm.h
View file

@ -158,7 +158,6 @@ struct kvm_vcpu;
struct kvm_mmu {
void (*new_cr3)(struct kvm_vcpu *vcpu);
int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
void (*inval_page)(struct kvm_vcpu *vcpu, gva_t gva);
void (*free)(struct kvm_vcpu *vcpu);
gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva);
hpa_t root_hpa;

4
drivers/kvm/kvm_main.c
View file

@ -943,10 +943,6 @@ static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
{
spin_lock(&vcpu->kvm->lock);
vcpu->mmu.inval_page(vcpu, address);
spin_unlock(&vcpu->kvm->lock);
kvm_arch_ops->invlpg(vcpu, address);
return X86EMUL_CONTINUE;
}

43
drivers/kvm/mmu.c
View file

@ -767,10 +767,6 @@ static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
return nonpaging_map(vcpu, addr & PAGE_MASK, paddr);
}
static void nonpaging_inval_page(struct kvm_vcpu *vcpu, gva_t addr)
{
}
static void nonpaging_free(struct kvm_vcpu *vcpu)
{
mmu_free_roots(vcpu);
@ -782,7 +778,6 @@ static int nonpaging_init_context(struct kvm_vcpu *vcpu)
context->new_cr3 = nonpaging_new_cr3;
context->page_fault = nonpaging_page_fault;
context->inval_page = nonpaging_inval_page;
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->free = nonpaging_free;
context->root_level = 0;
@ -895,42 +890,6 @@ static int may_access(u64 pte, int write, int user)
return 1;
}
/*
* Remove a shadow pte.
*/
static void paging_inval_page(struct kvm_vcpu *vcpu, gva_t addr)
{
hpa_t page_addr = vcpu->mmu.root_hpa;
int level = vcpu->mmu.shadow_root_level;
++kvm_stat.invlpg;
for (; ; level--) {
u32 index = PT64_INDEX(addr, level);
u64 *table = __va(page_addr);
if (level == PT_PAGE_TABLE_LEVEL ) {
rmap_remove(vcpu->kvm, &table[index]);
table[index] = 0;
return;
}
if (!is_present_pte(table[index]))
return;
page_addr = table[index] & PT64_BASE_ADDR_MASK;
if (level == PT_DIRECTORY_LEVEL &&
(table[index] & PT_SHADOW_PS_MARK)) {
table[index] = 0;
release_pt_page_64(vcpu, page_addr, PT_PAGE_TABLE_LEVEL);
kvm_arch_ops->tlb_flush(vcpu);
return;
}
}
}
static void paging_free(struct kvm_vcpu *vcpu)
{
nonpaging_free(vcpu);
@ -951,7 +910,6 @@ static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
ASSERT(is_pae(vcpu));
context->new_cr3 = paging_new_cr3;
context->page_fault = paging64_page_fault;
context->inval_page = paging_inval_page;
context->gva_to_gpa = paging64_gva_to_gpa;
context->free = paging_free;
context->root_level = level;
@ -974,7 +932,6 @@ static int paging32_init_context(struct kvm_vcpu *vcpu)
context->new_cr3 = paging_new_cr3;
context->page_fault = paging32_page_fault;
context->inval_page = paging_inval_page;
context->gva_to_gpa = paging32_gva_to_gpa;
context->free = paging_free;
context->root_level = PT32_ROOT_LEVEL;

1
drivers/kvm/svm.c
View file

@ -497,7 +497,6 @@ static void init_vmcb(struct vmcb *vmcb)
/* (1ULL << INTERCEPT_SELECTIVE_CR0) | */
(1ULL << INTERCEPT_CPUID) |
(1ULL << INTERCEPT_HLT) |
(1ULL << INTERCEPT_INVLPG) |
(1ULL << INTERCEPT_INVLPGA) |
(1ULL << INTERCEPT_IOIO_PROT) |
(1ULL << INTERCEPT_MSR_PROT) |

13
drivers/kvm/vmx.c
View file

@ -1059,7 +1059,6 @@ static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
| CPU_BASED_CR8_LOAD_EXITING /* 20.6.2 */
| CPU_BASED_CR8_STORE_EXITING /* 20.6.2 */
| CPU_BASED_UNCOND_IO_EXITING /* 20.6.2 */
| CPU_BASED_INVDPG_EXITING
| CPU_BASED_MOV_DR_EXITING
| CPU_BASED_USE_TSC_OFFSETING /* 21.3 */
);
@ -1438,17 +1437,6 @@ static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
return 0;
}
static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
u64 address = vmcs_read64(EXIT_QUALIFICATION);
int instruction_length = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
spin_lock(&vcpu->kvm->lock);
vcpu->mmu.inval_page(vcpu, address);
spin_unlock(&vcpu->kvm->lock);
vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP) + instruction_length);
return 1;
}
static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
u64 exit_qualification;
@ -1636,7 +1624,6 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
[EXIT_REASON_EXCEPTION_NMI] = handle_exception,
[EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
[EXIT_REASON_IO_INSTRUCTION] = handle_io,
[EXIT_REASON_INVLPG] = handle_invlpg,
[EXIT_REASON_CR_ACCESS] = handle_cr,
[EXIT_REASON_DR_ACCESS] = handle_dr,
[EXIT_REASON_CPUID] = handle_cpuid,