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authorAvi Kivity <avi@qumranet.com>2008-08-26 11:05:28 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2008-09-08 04:44:32 -0700
commitb6908a04c2ad87725659a1df481921891e3516bc (patch)
treeba7d88a2761c46285b39ff5a8d698681e5bbdb1b
parent06a27e265d6be92db8ef6e4abbef33c45453b2cb (diff)
KVM: MMU: Fix torn shadow pte
(cherry picked from commit cd5998ebfbc9e6cb44408efa217c15d7eea13675) 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/x86/kvm/paging_tmpl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 934c7b619396..d333a74a1ed3 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -343,7 +343,7 @@ 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,