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authorAlexander Graf <agraf@suse.de>2010-02-09 17:37:10 +0100
committerMichael S. Tsirkin <mst@redhat.com>2010-02-14 16:10:54 +0200
commitc6a94ba5f9b8240f90ac2bf5ae5249bf5590c438 (patch)
tree2074b1d48ab1d6c172abdd30f7a2bdb3c1a29433 /target-ppc
parentb2eca4453fb60c85c63912b7218b41b521165d94 (diff)
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PPC: Add timer when running KVM
For some odd reason we sometimes hang inside KVM forever. I'd guess it's a race condition where we actually have a level triggered interrupt, but the infrastructure can't expose that yet, so the guest ACKs it, goes to sleep and never gets notified that there's still an interrupt pending. As a quick workaround, let's just wake up every 500 ms. That way we can assure that we're always reinjecting interrupts in time. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'target-ppc')
-rw-r--r--target-ppc/kvm.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 9886b54..8ad0037 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -37,6 +37,22 @@
do { } while (0)
#endif
+/* XXX For some odd reason we sometimes hang inside KVM forever. I'd guess it's
+ * a race condition where we actually have a level triggered interrupt, but
+ * the infrastructure can't expose that yet, so the guest ACKs it, goes to
+ * sleep and never gets notified that there's still an interrupt pending.
+ *
+ * As a quick workaround, let's just wake up every 500 ms. That way we can
+ * assure that we're always reinjecting interrupts in time.
+ */
+static QEMUTimer *idle_timer;
+
+static void do_nothing(void *opaque)
+{
+ qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +
+ (get_ticks_per_sec() / 2));
+}
+
int kvm_arch_init(KVMState *s, int smp_cpus)
{
return 0;
@@ -173,6 +189,12 @@ int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
int r;
unsigned irq;
+ if (!idle_timer) {
+ idle_timer = qemu_new_timer(vm_clock, do_nothing, NULL);
+ qemu_mod_timer(idle_timer, qemu_get_clock(vm_clock) +
+ (get_ticks_per_sec() / 2));
+ }
+
/* PowerPC Qemu tracks the various core input pins (interrupt, critical
* interrupt, reset, etc) in PPC-specific env->irq_input_state. */
if (run->ready_for_interrupt_injection &&