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[PULL,10/12] KVM: PPC: Book3S HV: Fix preempted vcore list locking

Message ID 1440235295-244203-11-git-send-email-agraf@suse.de
State Accepted, archived
Headers show

Commit Message

Alexander Graf Aug. 22, 2015, 9:21 a.m. UTC 
From: Paul Mackerras <paulus@samba.org>

When a vcore gets preempted, we put it on the preempted vcore list for
the current CPU.  The runner task then calls schedule() and comes back
some time later and takes itself off the list.  We need to be careful
to lock the list that it was put onto, which may not be the list for the
current CPU since the runner task may have moved to another CPU.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/book3s_hv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 6e3ef30..3d02276 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1962,10 +1962,11 @@  static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
 
 static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
 {
-	struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
+	struct preempted_vcore_list *lp;
 
 	kvmppc_core_end_stolen(vc);
 	if (!list_empty(&vc->preempt_list)) {
+		lp = &per_cpu(preempted_vcores, vc->pcpu);
 		spin_lock(&lp->lock);
 		list_del_init(&vc->preempt_list);
 		spin_unlock(&lp->lock);