[patch 12/48] KVM: MMU: Flush tlbs after clearing write permission when accessing dirty log

From: Greg KH
Date: Fri Sep 04 2009 - 16:21:02 EST

2.6.27-stable review patch. If anyone has any objections, please let us know.

From: Avi Kivity <avi@xxxxxxxxxxxx>

(cherry picked from commit 171d595d3b3254b9a952af8d1f6965d2e85dcbaa)

Otherwise, the cpu may allow writes to the tracked pages, and we lose
some display bits or fail to migrate correctly.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
arch/x86/kvm/mmu.c | 1 +
1 file changed, 1 insertion(+)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2069,6 +2069,7 @@ void kvm_mmu_slot_remove_write_access(st
if (pt[i] & PT_WRITABLE_MASK)
+ kvm_flush_remote_tlbs(kvm);

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