On 08.01.2012, at 14:18, Avi Kivity wrote:
> On 01/04/2012 03:10 AM, Alexander Graf wrote:
>> From: Scott Wood <scottwood@xxxxxxxxxxxxx>
>>
>> Currently we check prior to returning from a lightweight exit,
>> but not prior to initial entry.
>>
>> book3s already does a similar test.
>>
>> Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
>> Signed-off-by: Alexander Graf <agraf@xxxxxxx>
>> ---
>> arch/powerpc/kvm/booke.c | 10 +++++++++-
>> 1 files changed, 9 insertions(+), 1 deletions(-)
>>
>> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
>> index b642200..9c78589 100644
>> --- a/arch/powerpc/kvm/booke.c
>> +++ b/arch/powerpc/kvm/booke.c
>> @@ -322,11 +322,19 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
>> }
>>
>> local_irq_disable();
>> +
>> + if (signal_pending(current)) {
>> + kvm_run->exit_reason = KVM_EXIT_INTR;
>> + ret = -EINTR;
>> + goto out;
>> + }
>> +
>> kvm_guest_enter();
>> ret = __kvmppc_vcpu_run(kvm_run, vcpu);
>> kvm_guest_exit();
>> - local_irq_enable();
>>
>>
>
> In general a single check prior to entry is sufficient (well, in
> addition to the one in kvm_vcpu_block()).
Yes, and IIUC this is the single check prior to entry. On lightweight exit, we don't return from __kvmppc_vcpu_run, but only call kvmppc_handle_exit() and if that exits that we return to the guest, we stay inside of __kvmppc_vcpu_run and don't return from here.
Alex
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