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authorAvi Kivity <avi@redhat.com>2010-09-21 19:59:43 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-09-23 11:31:56 -0300
commitca242ac9960dc61530e25a2c190e4e13fd5f1ecb (patch)
tree96ecac4191e1e1146002df587d0076e6e61e63d0 /virt
parent6bbfb2653177a00f70e57e53625502d43804fed0 (diff)
downloadlinux-2.6.38-lt-ux500-ca242ac9960dc61530e25a2c190e4e13fd5f1ecb.tar.gz
KVM: Fix reboot on Intel hosts
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. KVM-Stable-Tag. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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 d4853a54771..5186e728c53 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1970,10 +1970,12 @@ 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();
}