KVM: MMU: flush remote TLBs on large->normal entry overwrite

It is necessary to flush all TLB's when a large spte entry is
overwritten with a normal page directory pointer.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6dd08e096e24..e9fbaa44d444 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -310,8 +310,11 @@ static int FNAME(shadow_walk_entry)(struct kvm_shadow_walk *_sw,
         if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep))
                 return 0;
 
-        if (is_large_pte(*sptep))
+        if (is_large_pte(*sptep)) {
+                set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
+                kvm_flush_remote_tlbs(vcpu->kvm);
                 rmap_remove(vcpu->kvm, sptep);
+        }
 
         if (level == PT_DIRECTORY_LEVEL && gw->level == PT_DIRECTORY_LEVEL) {
                 metaphysical = 1;