[PATCH v3 0/2] PSCI system off and reset for KVM ARM/ARM64

[Anup Patel]

On Wed, Dec 18, 2013 at 8:08 PM, Marc Zyngier <marc.zyngier at arm.com> wrote:
> Christoffer Dall <christoffer.dall at linaro.org> writes:
>
>> On Tue, Dec 17, 2013 at 05:05:34PM +0530, Anup Patel wrote:
>>> The Power State and Coordination Interface (PSCI) specification defines
>>> SYSTEM_OFF and SYSTEM_RESET functions for system poweroff and reboot.
>>>
>>> This patchset adds emulation of PSCI SYSTEM_OFF and SYSTEM_RESET functions
>>> in KVM ARM/ARM64 by forwarding them to user space (QEMU or KVMTOOL) using
>>> KVM_EXIT_SYSTEM_EVENT exit reason.
>>>
>>> To try this patch from guest kernel, we will need PSCI-based restart and
>>> poweroff support in the guest kenel for both ARM and ARM64.
>>>
>>> Rob Herring has already submitted patches for PSCI-based restart and
>>> poweroff in ARM kernel but these are not merged yet due unstable device
>>> tree bindings of kernel PSCI support. We will be having similar patches
>>> for PSCI-based restart and poweroff in ARM64 kernel.
>>> (Refer http://www.spinics.net/lists/arm-kernel/msg262217.html)
>>> (Refer http://www.spinics.net/lists/devicetree/msg05348.html)
>>
>> Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>
>>
>> I can merge this series if Marc acks it as well.
>
> The patches themselves are mostly fine. One issue though: They implement
> part of the v0.2 spec, but keep on using the range of function IDs that
> we made up for v0.1.
>
> I just had a chat with the person responsible for the spec, and realized
> that the Function IDs mentionned in the v0.2 spec are not optional, and
> not using them would be in direct violation of the spec (the new numbers
> now come directly from the SMC calling convention).

Should we emulate PSCI_VERSION call to help Guest determine
the spec version emulated by KVM (i.e. v0.1 or v0.2) ??

>
> So I rekon we need to create a separate range for those. Also, I'd like
> to progress the DT and kernel side of things as well (otherwise this is
> all a bit pointless).
>
> Rob: what are your plans regarding your PSCI v0.2 patches?
>
> Thanks,
>
>         M.
> --
> Jazz is not dead. It just smells funny.
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Regards,
Anup