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KVM: VMX: fix invalid cpu passed to smp_call_function_single 

In loaded_vmcs_clear, loaded_vmcs->cpu is the fist parameter passed to
smp_call_function_single, if the target cpu is downing (doing cpu hot remove),
loaded_vmcs->cpu can become -1 then -1 is passed to smp_call_function_single

It can be triggered when vcpu is being destroyed, loaded_vmcs_clear is called
in the preemptionable context

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2012-11-28 20:53:15 +08:00 committed by Marcelo Tosatti
parent 859f8450d8
commit e6c7d32172
1 changed files with 5 additions and 3 deletions
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8
arch/x86/kvm/vmx.c
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@ -1007,9 +1007,11 @@ static void __loaded_vmcs_clear(void *arg)
static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
{
if (loaded_vmcs->cpu != -1)
smp_call_function_single(
loaded_vmcs->cpu, __loaded_vmcs_clear, loaded_vmcs, 1);
int cpu = loaded_vmcs->cpu;
if (cpu != -1)
smp_call_function_single(cpu,
__loaded_vmcs_clear, loaded_vmcs, 1);
}
static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)