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authorMarcelo Tosatti <mtosatti@redhat.com>2008-04-11 21:53:26 +0400
committerAvi Kivity <avi@qumranet.com>2008-04-27 13:04:11 +0400
commit3d80840d96127401ba6aeadd813c3a15b84e70fe (patch)
treeb3e083c651f09fee362d88f0d1fc140194f2431d /arch/s390
parent3564990af1b9f77a63692c1079e9c41af229f066 (diff)
downloadlinux-3d80840d96127401ba6aeadd813c3a15b84e70fe.tar.xz
KVM: hlt emulation should take in-kernel APIC/PIT timers into account
Timers that fire between guest hlt and vcpu_block's add_wait_queue() are ignored, possibly resulting in hangs. Also make sure that atomic_inc and waitqueue_active tests happen in the specified order, otherwise the following race is open: CPU0 CPU1 if (waitqueue_active(wq)) add_wait_queue() if (!atomic_read(pit_timer->pending)) schedule() atomic_inc(pit_timer->pending) Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/interrupt.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index f62588cb75f8..fcd1ed8015c1 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -325,6 +325,11 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
return rc;
}
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return 0;
+}
+
int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
{
u64 now, sltime;