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kvm,powerpc: Serialize wq active checks in ops->vcpu_kick

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Particularly because kvmppc_fast_vcpu_kick_hv() is a callback,
ensure that we properly serialize wq active checks in order to
avoid potentially missing a wakeup due to racing with the waiter
side.

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 13:08:23 -07:00 • committed by Paolo Bonzini
commit 267ad7bc2d
1 changed files with 1 additions and 1 deletions
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arch/powerpc/kvm/book3s_hv.c
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@ -181,7 +181,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
struct swait_queue_head *wqp;
wqp = kvm_arch_vcpu_wq(vcpu);
if (swait_active(wqp)) {
if (swq_has_sleeper(wqp)) {
swake_up(wqp);
++vcpu->stat.halt_wakeup;
}