diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-13 10:52:45 (GMT) |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-25 16:24:23 (GMT) |
| commit | 0e3d0648bd903ff6cda7499f9349a2ce612bccb4 (patch) | |
| tree | 5595b7e53263b89c72d708cf8efdb9bbd05cb405 /arch/x86/kvm | |
| parent | aba2f06c070f604e388cf77b1dcc7f4cf4577eb0 (diff) | |
| download | linux-0e3d0648bd903ff6cda7499f9349a2ce612bccb4.tar.xz | |
KVM: x86: MMU: always set accessed bit in shadow PTEs
Commit 7a1638ce4220 ("nEPT: Redefine EPT-specific link_shadow_page()",
2013-08-05) says:
Since nEPT doesn't support A/D bit, we should not set those bit
when building the shadow page table.
but this is not necessary. Even though nEPT doesn't support A/D
bits, and hence the vmcs12 EPT pointer will never enable them,
we always use them for shadow page tables if available (see
construct_eptp in vmx.c). So we can set the A/D bits freely
in the shadow page table.
This patch hence basically reverts commit 7a1638ce4220.
Cc: Yang Zhang <yang.z.zhang@Intel.com>
Cc: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 9 | ||||
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 4 |
2 files changed, 5 insertions, 8 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index e7c2c14..276d2f2 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2198,7 +2198,7 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) return __shadow_walk_next(iterator, *iterator->sptep); } -static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed) +static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp) { u64 spte; @@ -2206,10 +2206,7 @@ static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed) VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK); spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK | - shadow_user_mask | shadow_x_mask; - - if (accessed) - spte |= shadow_accessed_mask; + shadow_user_mask | shadow_x_mask | shadow_accessed_mask; mmu_spte_set(sptep, spte); } @@ -2740,7 +2737,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, iterator.level - 1, 1, ACC_ALL, iterator.sptep); - link_shadow_page(iterator.sptep, sp, true); + link_shadow_page(iterator.sptep, sp); } } return emulate; diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 3058a22..d8fdc5c 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -598,7 +598,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, goto out_gpte_changed; if (sp) - link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK); + link_shadow_page(it.sptep, sp); } for (; @@ -618,7 +618,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1, true, direct_access, it.sptep); - link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK); + link_shadow_page(it.sptep, sp); } clear_sp_write_flooding_count(it.sptep); |