[PATCH 27/52] KVM: PPC: Make wakeups work again for Book3S HV guests

Alexander Graf
2012-01-13T14:58:39Z

From: Paul Mackerras <paulus@samba.org>

When commit f43fdc15fa ("KVM: PPC: booke: Improve timer register
emulation") factored out some code in arch/powerpc/kvm/powerpc.c
into a new helper function, kvm_vcpu_kick(), an error crept in
which causes Book3s HV guest vcpus to stall. This fixes it.
On POWER7 machines, guest vcpus are grouped together into virtual
CPU cores that share a single waitqueue, so it's important to use
vcpu->arch.wqp rather than &vcpu->wq.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/powerpc/kvm/powerpc.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index e1ef4d6..4f85ac3 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -562,7 +562,7 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
int cpu = vcpu->cpu;

me = get_cpu();
- if (waitqueue_active(&vcpu->wq)) {
+ if (waitqueue_active(vcpu->arch.wqp)) {
wake_up_interruptible(vcpu->arch.wqp);
vcpu->stat.halt_wakeup++;
} else if (cpu != me && cpu != -1) {
--
1.6.0.2