Re: [PATCH] KVM: PPC: booke: check for signals in kvmppc_vcpu_run

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On Fri, Nov 11, 2011 at 03:09:17PM +0100, Alexander Graf wrote:
> On 11/08/2011 11:11 PM, Scott Wood wrote:
> >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>
> >---
> >  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)) {
> 
> Any reason you're doing this after irq_disable()?

If we get a signal after the check, we want to be sure that we don't
receive the reschedule IPI until after we're in the guest, so that it
will cause another signal check.

-Scott

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