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Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr |
Date: |
Fri, 29 May 2015 15:03:26 +0200 |
On Fri, 29 May 2015 15:26:57 +0300
Pavel Fedin <address@hidden> wrote:
> 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.
Well KVM side should be fixed instead of driving us along wrong route.
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia
>
>
- [Qemu-devel] [PATCH] Use Aff1 with mpidr, Pavel Fedin, 2015/05/22
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Shlomo Pongratz, 2015/05/28
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Igor Mammedov, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Pavel Fedin, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Igor Mammedov, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Pavel Fedin, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr,
Igor Mammedov <=
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Pavel Fedin, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Pavel Fedin, 2015/05/29
- Re: [Qemu-devel] [PATCH] Use Aff1 with mpidr, Shannon Zhao, 2015/05/29