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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>
hifive-unleashed-5.1
Lan Tianyu 2016-03-13 11:10:29 +08:00 committed by Paolo Bonzini
parent 4ae3cb3a25
commit 0f127d12e4
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kvm/x86.c
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@ -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();