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Re: [Qemu-devel] [PATCH RFC V2 1/4] Use Aff1 with mpidr

From: Shannon Zhao
Subject: Re: [Qemu-devel] [PATCH RFC V2 1/4] Use Aff1 with mpidr
Date: Thu, 28 May 2015 08:53:09 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 2015/5/28 2:03, Pavel Fedin wrote:
>  Hello!
>> I think encoding should be CPU type specific i.e. not defined by what
>> GIC can support and once we add CPU type with 8 cores, it would provide
>> it's own version of mpidr_read since it would be defined by spec
>> how to encode aff0.
>  I have redone this thing from scratch:
> https://lists.gnu.org/archive/html/qemu-devel/2015-05/msg04495.html
> My implementation does exactly this. It simply introduces CPU-specific MPIDR 
> value which
> CPUs can set as they wish.

IIUC, your implementation also uses 8 cpus per cluster which is not
consistent with CPU spec.

> Also this is used by KVM because KVM has its own ideas about
> how CPUs are clustered.
> I posted that without RFC, because i think it's ready for application, but my 
> message
> seems to have been lost. Looks like i forgot Cc to the maintainer. My current 
> vGICv3
> work-in-progress is based on this.
>  If Shlomo does not respond until friday, i think i'll post a new vGICv3 
> series based on
> master.

I guess we should give people time to do the respin or other things.

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


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