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>

parent 18b13e54

arch/x86/kvm/paging_tmpl.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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,