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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: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-08-22 19:19:38 +03:00
parent 18b13e5457
commit cd5998ebfb
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/paging_tmpl.h
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@ -345,7 +345,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
shadow_addr = __pa(shadow_page->spt);
shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_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,