KVM: PPC: Destory timer on vcpu destruction

When we destory a vcpu, we should also make sure to kill all pending
timers that could still be up. When not doing this, hrtimers might
dereference null pointers trying to call our code.

This patch fixes spontanious kernel panics seen after closing VMs.

Signed-off-by: Alexander Graf <alex@csgraf.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index ad2b6275acb7..ace31ca05245 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -200,6 +200,10 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 
 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 {
+        /* Make sure we're not using the vcpu anymore */
+        hrtimer_cancel(&vcpu->arch.dec_timer);
+        tasklet_kill(&vcpu->arch.tasklet);
+
         kvmppc_remove_vcpu_debugfs(vcpu);
         kvmppc_core_vcpu_free(vcpu);
 }