KVM: X86: Zap the invalid list after remote tlb flushing

In mmu_sync_children(), it can zap the invalid list after remote tlb flushing.
Emptifying the invalid list ASAP might help reduce a remote tlb flushing
in some cases.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210918005636.3675-8-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 34de5a8..ccfcdc0 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -2035,7 +2035,7 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu,
                        protected |= rmap_write_protect(vcpu, sp->gfn);
 
                if (protected) {
-                       kvm_flush_remote_tlbs(vcpu->kvm);
+                       kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, true);
                        flush = false;
                }