Commit cd5998eb authored by Avi Kivity's avatar Avi Kivity

KVM: MMU: Fix torn shadow pte

The shadow code assigns a pte directly in one place, which is nonatomic on
i386 can can cause random memory references.  Fix by using an atomic setter.
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 18b13e54
...@@ -345,7 +345,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, ...@@ -345,7 +345,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
shadow_addr = __pa(shadow_page->spt); shadow_addr = __pa(shadow_page->spt);
shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_MASK shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_MASK
| PT_WRITABLE_MASK | PT_USER_MASK; | PT_WRITABLE_MASK | PT_USER_MASK;
*shadow_ent = shadow_pte; set_shadow_pte(shadow_ent, shadow_pte);
} }
mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access, mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access,
......
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