Re: [Qemu-arm] [Qemu-devel] [PATCH] hw/arm/virt: gicv3: use all target-list bits

[Peter Maydell]

On 24 June 2016 at 17:15, Andrew Jones <address@hidden> wrote:
> On Fri, Jun 24, 2016 at 06:03:21PM +0200, Andrew Jones wrote:
>> So we can either
>> a) play it safe and always use clusters of 4 for ARM guests, and
>>    KVM will get "fixed" when we start managing the guest's MPIDR
>>    from userspace, or
>> b) use 8 here, as TCG always has, and KVM does for AArch32 guests.
>>    This might be less safe, but also improves SGI efficiency.
>
> Actually AArch32 guests would even use all 16 tlist bits on gicv3, if
> there was a KVM host available to try it. So the (b) option shouldn't
> be "use 8" it should be "don't treat 32-bit guests differently"

KVM AArch32 is 4 CPUs per cluster:
http://lxr.free-electrons.com/source/arch/arm/kvm/coproc.c#L109

thanks
-- PMM