Commit 267ad7bc authored Sep 13, 2017 by Davidlohr Bueso Committed by Paolo Bonzini Sep 15, 2017

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



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>

parent 5e0018b3

arch/powerpc/kvm/book3s_hv.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}