From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Wed, 30 Jun 2010 08:04:06 +0000 (+0800)
Subject: KVM: MMU: flush remote tlbs when overwriting spte with different pfn
X-Git-Tag: v2.6.34.3~12
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e11e4f058c98a984fd23e0f04c27a74e684b754b;p=thirdparty%2Fkernel%2Fstable.git

KVM: MMU: flush remote tlbs when overwriting spte with different pfn

(cherry picked from commit 91546356d0e550fa23abf7f4b04a903c2855761f)

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

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index dd3df44b86142..ca850d4b09970 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1901,6 +1901,8 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 			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;
 	}