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Re: [Xen-devel] [PATCH V5 10/10] xen/arm64: increase MAX_VIRT_CPUS to 128 on arm64

> On May 31, 2015, at 21:40, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Chen,
> On 30/05/2015 12:07, Chen Baozi wrote:
>> From: Chen Baozi <baozich@xxxxxxxxx>
>> GIC-500 supports up to 128 cores in a single SoC. Increase MAX_VIRT_CPUS
>> to 128 on arm64.
> Where did you find this restriction? AFAICT the changes you made in the 
> vGICv3 driver allow us to use up to 4096 CPUs.

In ARM DDI0516B (ARM CoreLinkTM GIC-500 Generic Interrupt Controller
Technical Reference Manual):

1.1 About the GIC-500

The GIC-500 is a build-time configurable interrupt controller that supports up 
to 128 cores.

And GIC-500 is the only GICv3 implementation as far as I know.



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