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KVM: VMX: Use EPT Access bit in response to memory notifiers 

Signed-off-by: Haitao Shan <haitao.shan@intel.com>
Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xudong Hao 2012-05-22 11:23:15 +08:00 committed by Avi Kivity
parent b38f993478
commit 3f6d8c8a47
2 changed files with 12 additions and 8 deletions
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14
arch/x86/kvm/mmu.c
View File

@ -1242,7 +1242,8 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
int young = 0;
/*
* Emulate the accessed bit for EPT, by checking if this page has
* In case of absence of EPT Access and Dirty Bits supports,
* emulate the accessed bit for EPT, by checking if this page has
* an EPT mapping, and clearing it if it does. On the next access,
* a new EPT mapping will be established.
* This has some overhead, but not as much as the cost of swapping
@ -1253,11 +1254,12 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
for (sptep = rmap_get_first(*rmapp, &iter); sptep;
sptep = rmap_get_next(&iter)) {
BUG_ON(!(*sptep & PT_PRESENT_MASK));
BUG_ON(!is_shadow_present_pte(*sptep));
if (*sptep & PT_ACCESSED_MASK) {
if (*sptep & shadow_accessed_mask) {
young = 1;
clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)sptep);
clear_bit((ffs(shadow_accessed_mask) - 1),
(unsigned long *)sptep);
}
}
@ -1281,9 +1283,9 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
for (sptep = rmap_get_first(*rmapp, &iter); sptep;
sptep = rmap_get_next(&iter)) {
BUG_ON(!(*sptep & PT_PRESENT_MASK));
BUG_ON(!is_shadow_present_pte(*sptep));
if (*sptep & PT_ACCESSED_MASK) {
if (*sptep & shadow_accessed_mask) {
young = 1;
break;
}

6
arch/x86/kvm/vmx.c
View File

@ -7289,8 +7289,10 @@ static int __init vmx_init(void)
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
if (enable_ept) {
kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
VMX_EPT_EXECUTABLE_MASK);
kvm_mmu_set_mask_ptes(0ull,
(enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull,
(enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull,
0ull, VMX_EPT_EXECUTABLE_MASK);
ept_set_mmio_spte_mask();
kvm_enable_tdp();
} else