KVM/x86: update the comment of memory barrier in the vcpu_enter_guest()

The barrier also orders the write to mode from any reads
to the page tables done and so update the comment.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 98ae1fb..e260ccb 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6596,8 +6596,12 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 
        srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
 
-       /* We should set ->mode before check ->requests,
-        * see the comment in make_all_cpus_request.
+       /*
+        * We should set ->mode before check ->requests,
+        * Please see the comment in kvm_make_all_cpus_request.
+        * This also orders the write to mode from any reads
+        * to the page tables done while the VCPU is running.
+        * Please see the comment in kvm_flush_remote_tlbs.
         */
        smp_mb__after_srcu_read_unlock();