[patch] KVM: fix vcpu_clear() bug

[Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>]

Subject: [patch] KVM: fix vcpu_clear() bug
From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>

if vcpu_clear() is called on a not yet run vcpu then vcpu->cpu will be 
-1. Check this case and dont call smp_call_function_single(-1).

this patch fixes the crash i reported earlier and -trunk now works fine 
on a 32-bit SMP host.

Signed-off-by: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
---
 drivers/kvm/vmx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/drivers/kvm/vmx.c
===================================================================
--- linux.orig/drivers/kvm/vmx.c
+++ linux/drivers/kvm/vmx.c
@@ -127,7 +127,7 @@ static void __vcpu_clear(void *arg)
 
 static void vcpu_clear(struct kvm_vcpu *vcpu)
 {
-	if (vcpu->cpu != raw_smp_processor_id())
+	if (vcpu->cpu != raw_smp_processor_id() && vcpu->cpu != -1)
 		smp_call_function_single(vcpu->cpu, __vcpu_clear, vcpu, 0, 1);
 	else
 		__vcpu_clear(vcpu);

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