Re: [Xen-devel] [PATCH V6 01/10] xen/arm: gic-v3: Increase the size of GICR in address space for guest

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 05/06/15 16:49, Ian Campbell wrote:
> On Mon, 2015-06-01 at 20:56 +0800, Chen Baozi wrote:
>> From: Chen Baozi <baozich@xxxxxxxxx>
>>
>> Currently it only supports up to 8 vCPUs. Increase the region to hold
>> up to 128 vCPUs, which is the maximum number that GIC-500 supports.
>>
>> Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
>> Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> I did briefly wonder if we should shoot for the stars here and reserve
> space for some enormous set of processors, but I suppose there's no
> need.

I though about the same things. AFF0 + AFF1 gives 4096 CPUs.

Although as we will support only 128 vCPUs (see the last patch),
reserving more space is not necessary. This space saved can be used for
a bigger PCI MMIO region later.

Regards,

-- 
Julien Grall

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