[PATCH 4/4] KVM: PPC: e500: SPE switch between guest and host

[Scott Wood]

On Tue, 29 Mar 2011 11:47:51 +0200
Alexander Graf <agraf at suse.de> wrote:

> On 28.03.2011, at 21:25, Scott Wood wrote:
> 
> > @@ -344,10 +345,19 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
> > 		r = RESUME_GUEST;
> > 		break;
> > 
> > -	case BOOKE_INTERRUPT_SPE_UNAVAIL:
> > -		kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_UNAVAIL);
> > +#ifdef CONFIG_SPE
> > +	case BOOKE_INTERRUPT_SPE_UNAVAIL: {
> 
> This means that on non-SPE enabled host kernels you'll get a KVM fatal error when the guest triggers SPE_UNAVAIL, as the exit simply isn't handled and triggers:
> 
>         default:
>                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
>                 BUG();

Right, thanks for spotting -- will have it send an illegal instruction trap
to the guest in that case.

-Scott