From 489153c746746fc44b1e2fd184248dee8aebbaff Mon Sep 17 00:00:00 2001 From: Lan Tianyu Date: Sun, 13 Mar 2016 11:10:30 +0800 Subject: [PATCH] KVM/PPC: update the comment of memory barrier in the kvmppc_prepare_to_enter() 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 Signed-off-by: Paolo Bonzini --- arch/powerpc/kvm/powerpc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 19aa59b0850c..6a68730774ee 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -96,6 +96,9 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu) * so we don't miss a request because the requester sees * OUTSIDE_GUEST_MODE and assumes we'll be checking requests * before next entering the guest (and thus doesn't IPI). + * 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(); -- 2.20.1