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Date: Sun, 13 Mar 2016 11:10:29 +0800 From: Lan Tianyu <tianyu.lan@...el.com> To: gleb@...nel.org, pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org, guangrong.xiao@...ux.intel.com Cc: Lan Tianyu <tianyu.lan@...el.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 6/7] 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@...el.com> --- arch/x86/kvm/x86.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index bcbce0f..4bdb4e6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6589,8 +6589,12 @@ 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(); -- 1.8.4.rc0.1.g8f6a3e5.dirty
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