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KVM: x86: MMU: always set accessed bit in shadow PTEs

Selaa lähdekoodia 
Commit 7a1638ce42 ("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 7a1638ce42.

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>
This commit is contained in:
Paolo Bonzini
2015-11-13 11:52:45 +01:00
vanhempi aba2f06c07
commit 0e3d0648bd
2 muutettua tiedostoa jossa 5 lisäystä ja 8 poistoa
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9
arch/x86/kvm/mmu.c
Näytä tiedosto

@@ -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;