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kvm: Serialize wq active checks in kvm_vcpu_wake_up()

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This is a generic call and can be suceptible to races
in reading the wq task_list while another task is adding
itself to the list. Add a full barrier by using the
swq_has_sleeper() helper.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Davidlohr Bueso 2017-09-13 13:08:22 -07:00 • committed by Paolo Bonzini
parent a0cff57bb2
commit 5e0018b3e3
1 changed files with 1 additions and 1 deletions
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2
virt/kvm/kvm_main.c
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@ -2187,7 +2187,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
struct swait_queue_head *wqp; struct swait_queue_head *wqp;
wqp = kvm_arch_vcpu_wq(vcpu); wqp = kvm_arch_vcpu_wq(vcpu);
if (swait_active(wqp)) { if (swq_has_sleeper(wqp)) {
swake_up(wqp); swake_up(wqp);
++vcpu->stat.halt_wakeup; ++vcpu->stat.halt_wakeup;
return true; return true;