Re: [Xen-devel] [PATCH V5 02/10] xen/arm: Add functions of mapping between vCPUID and virtual affinity

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Chen,

On 30/05/2015 12:07, Chen Baozi wrote:
> From: Chen Baozi <baozich@xxxxxxxxx>
>
> GICv3 restricts that the maximum number of CPUs in affinity 0 (one
> cluster) is 16. That is to say the upper 4 bits of affinity 0 is unused.
> Current implementation considers that AFF0 is equal to vCPUID, which
> makes all vCPUs in one cluster, limiting its number to 16. If we would
> like to support more than 16 number of vCPU in one guest, we need to
> make use of AFF1. Considering the unused upper 4 bits, we need to create
> a pair of functions mapping the vCPUID and virtual affinity.
>
> Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

--
Julien Grall

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