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From: Pavel Fedin <p.fedin@samsung.com>
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Date: Fri, 29 May 2015 15:26:57 +0300
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Subject: Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr
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To: 'Igor Mammedov' <imammedo@redhat.com>
Cc: peter.maydell@linaro.org, qemu-devel@nongnu.org, 'Ashok Kumar' <ashoks@broadcom.com>, 'Shlomo Pongratz' <shlomo.pongratz@huawei.com>

 Hello!

> That's what I see as correct way to go
> and along the way teach KVM to not derive mpidr encoding from vcpuid
> and use QEMU provided mpidr value, that way mpidr would be consistent.

 Yes, and this would make modelling of real hardware working much better. However,
unfortunately, i have just tested it, and it does not work. MPIDR can be set for the vCPU,
and i believe it will even give back the value when read. But PSCI completely ignores this
setting.

> As it currently stands QEMU notion of mpidr and KVM's will diverge
> onece CPU count goes above 16 CPUs.

 Yes, but fortunately the code which cares about it (PSCI and Shlomo's GICv3 software
emulation) is not used with KVM. So i think we have no other choice if we want to be
compatible with current KVM APIs.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia