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authorMarcelo Tosatti <mtosatti@redhat.com>2010-10-14 13:49:59 -0300
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-28 21:51:38 -0700
commit8706a900f0c047b49e34918cdf2b23dc82c234d5 (patch)
tree155113353ddb006095d37da59e77fbb373778514 /virt
parent85aa4285872f67bb21ecf7de0e467c57b4c6a976 (diff)
KVM: Fix reboot on Intel hosts
commit ca242ac9960dc61530e25a2c190e4e13fd5f1ecb upstream. When we reboot, we disable vmx extensions or otherwise INIT gets blocked. If a task on another cpu hits a vmx instruction, it will fault if vmx is disabled. We trap that to avoid a nasty oops and spin until the reboot completes. Problem is, we sleep with interrupts disabled. This blocks smp_send_stop() from running, and the reboot process halts. Fix by enabling interrupts before spinning. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 277452851313..dd85e2998196 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1942,10 +1942,12 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
asmlinkage void kvm_handle_fault_on_reboot(void)
{
- if (kvm_rebooting)
+ if (kvm_rebooting) {
/* spin while reset goes on */
+ local_irq_enable();
while (true)
;
+ }
/* Fault while not rebooting. We want the trace. */
BUG();
}