The H_PROD hypercall is supposed to wake up an idle vcpu. We have
an implementation, but because Linux doesn't use it except when
doing cpu hotplug, it was never tested properly. AIX does use it,
and reported it broken. It turns out we were waking the wrong
vcpu (the one doing H_PROD, not the target of the prod) and we
weren't handling the case where the target needs an IPI to wake
it. Fix it by using the existing kvmppc_fast_vcpu_kick_hv()
function, which is intended for this kind of thing, and by using
the target vcpu not the current vcpu.
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
---
arch/powerpc/kvm/book3s_hv.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index be8f83c..03070cd 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -773,12 +773,8 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
}
tvcpu->arch.prodded = 1;
smp_mb();
- if (vcpu->arch.ceded) {
- if (swait_active(&vcpu->wq)) {
- swake_up(&vcpu->wq);
- vcpu->stat.halt_wakeup++;
- }
- }
+ if (tvcpu->arch.ceded)
+ kvmppc_fast_vcpu_kick_hv(tvcpu);
break;
case H_CONFER:
target = kvmppc_get_gpr(vcpu, 4);
--
2.7.4
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
