KVM: MMU: do not reuse the obsolete page

The obsolete page will be zapped soon, do not reuse it to
reduce future page fault

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 3fd060a..0880b9b 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1875,6 +1875,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
                role.quadrant = quadrant;
        }
        for_each_gfn_sp(vcpu->kvm, sp, gfn) {
+               if (is_obsolete_sp(vcpu->kvm, sp))
+                       continue;
+
                if (!need_sync && sp->unsync)
                        need_sync = true;