KVM: MMU: remove rmap before clear spte

Remove rmap before clear spte otherwise it will trigger BUG_ON() in
some functions such as rmap_write_protect().

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index bb48b0ca5f8c..5c9d6df0113e 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1813,6 +1813,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
                 if (level > PT_PAGE_TABLE_LEVEL &&
                     has_wrprotected_page(vcpu->kvm, gfn, level)) {
                         ret = 1;
+                        rmap_remove(vcpu->kvm, sptep);
                         spte = shadow_trap_nonpresent_pte;
                         goto set_pte;
                 }