On Wed, Jun 26, 2019 at 01:09:45PM +0200, Richard Henderson wrote:
> On 6/21/19 6:34 PM, Andrew Jones wrote:
> > @@ -675,6 +689,11 @@ static void aarch64_max_initfn(Object *obj)
> >
> > if (kvm_enabled()) {
> > kvm_arm_set_cpu_features_from_host(cpu);
> > + /*
> > + * KVM doesn't yet support the sve-max-vq property, but
> > + * setting cpu->sve_max_vq is also used to turn SVE on.
> > + */
> > + cpu->sve_max_vq = ARM_SVE_INIT;
>
> Can we support this value with KVM_GET/SET_ONE_REG on ZCR_EL2? (IIRC KVM
> requires VHE to support SVE, so the host is always EL2 and the guest is always
> EL1.)
>
> Or do we need to probe this via normal userland prctl?
>
> Or am I getting ahead of the patches to follow?
Hopefully mostly this, because I didn't understand the concern with VHE.
If it still looks like something is missing after looking at other
patches, then please come back to this to help me understand.
Thanks,
drew
