On Mon, 2014-06-30 at 18:34 +0300, Mihai Caraman wrote:
> Add KVM Book3E AltiVec support. KVM Book3E FPU support gracefully reuse host
> infrastructure so follow the same approach for AltiVec.
>
> Signed-off-by: Mihai Caraman <[email protected]>
> ---
> v2:
> - integrate Paul's FP/VMX/VSX changes
>
> arch/powerpc/kvm/booke.c | 67
> ++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 65 insertions(+), 2 deletions(-)
I had to apply the whole patchset to get proper context for reviewing
this, and found some nits:
> case BOOKE_INTERRUPT_SPE_FP_DATA_ALTIVEC_ASSIST:
> if (kvmppc_supports_spe() || kvmppc_supports_altivec()) {
> kvmppc_booke_queue_irqprio(vcpu,
> BOOKE_IRQPRIO_SPE_FP_DATA_ALTIVEC_ASSIST);
> r = RESUME_GUEST;
> } else {
> /*
> * These really should never happen without
> CONFIG_SPE,
> * as we should never enable the real MSR[SPE] in the
> * guest.
> */
Besides the comment not being updated for Altivec, it's not true on HV,
where the guest can enable MSR[VEC] all by itself. For HV, the reason
we shouldn't be able to get here is that we disable KVM on e6500 if
CONFIG_ALTIVEC is not enabled, and no other HV core supports either SPE
or Altivec.
> pr_crit("%s: unexpected SPE interrupt %u at %08lx\n",
> __func__, exit_nr, vcpu->arch.pc);
Error string will say SPE regardless of what sort of chip you're on.
Given that this is explicitly on the "no support for Altivec or SPE"
path, "SPE/Altivec" phrasing seems appropriate. Of course we have
bigger problems than that if we ever reach this code. :-)
-Scott
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