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authorDavidlohr Bueso <dave@stgolabs.net>2017-09-13 13:08:23 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2017-09-15 16:57:13 +0200
commit267ad7bc2d3f69af536035b6a3e4a9a2b6ae11dc (patch)
treef3aef348c35710389e1be449b0fe390b397e292d
parent5e0018b3e39e9b44dbfb380b83026e55d2f65b91 (diff)
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>
-rw-r--r--arch/powerpc/kvm/book3s_hv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index a7177c284f9b..73bf1ebfa78f 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -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;
}