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

From: Pavel Fedin
Subject: Re: [Qemu-devel] [PATCH RFC V2 1/4] Use Aff1 with mpidr
Date: Thu, 21 May 2015 18:54:51 +0300


> In order to support up to 128 cores with GIC-500 (GICv3 implementation)
> affinity1 must be used. GIC-500 support up to 32 clusters with up to
> 8 cores in a cluster. So for example, if one wishes to have 16 cores,
> the options are: 2 clusters of 8 cores each, 4 clusters with 4 cores each

 I have found one more concern. Are you really sure about this scheme ? I am 
experimenting with KVM, and it seems to have 16 CPUs per cluster, at least on 
my machine.
Actually i suggest that KVM inherits the mapping from the host. Can we do the 
 I will take a look at kvmtool, how it determines these IDs. But hardcoded 
scheme is
definitely wrong.

 Cc'ed Ashok because he might also be interested.

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

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