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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>
This commit is contained in:
Avi Kivity 2010-09-21 19:59:43 +02:00 committed by Marcelo Tosatti
parent 6bbfb26531
commit ca242ac996
1 changed files with 3 additions and 1 deletions
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4
virt/kvm/kvm_main.c
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@ -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();
}