[PATCH v2 3/4] kvm/ppc: Call trace_hardirqs_on before entry

[Scott Wood]

On 05/09/2013 11:40:08 PM, tiejun.chen wrote:
> On 05/10/2013 11:34 AM, Bhushan Bharat-R65777 wrote:
>>> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
>>> index 705fc5c..eb89b83 100644
>>> --- a/arch/powerpc/kvm/booke.c
>>> +++ b/arch/powerpc/kvm/booke.c
>>> @@ -673,7 +673,7 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run,  
>>> struct kvm_vcpu
>>> *vcpu)
>>>   		ret = s;
>>>   		goto out;
>>>   	}
>>> -	kvmppc_lazy_ee_enable();
>>> +	kvmppc_fix_ee_before_entry();
>> 
>> local_irq_disable() is called before kvmppc_prepare_to_enter().
> 
> In patch 4, we call hard_irq_disable() once enter  
> kvmppc_prepare_to_enter().

And before patch 4, we have the code near the end of  
kvmppc_prepare_to_enter() that checks lazy_irq_pending() and aborts  
guest entry if there was a race.  If I'd known about that bit of code  
beforehand, I probably wouldn't have bothered with most of patch 4/4,  
but now that it's been done it seems cleaner.

-Scott