[26/36] KVM: MMU: flush remote tlbs when overwriting spte with different pfn

[Greg KH]

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

------------------

From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>

(cherry picked from commit 91546356d0e550fa23abf7f4b04a903c2855761f)

After remove a rmap, we should flush all vcpu's tlb

Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/x86/kvm/mmu.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1901,6 +1901,8 @@ static void mmu_set_spte(struct kvm_vcpu
 			pgprintk("hfn old %lx new %lx\n",
 				 spte_to_pfn(*sptep), pfn);
 			rmap_remove(vcpu->kvm, sptep);
+			__set_spte(sptep, shadow_trap_nonpresent_pte);
+			kvm_flush_remote_tlbs(vcpu->kvm);
 		} else
 			was_rmapped = 1;
 	}


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