Re: [Qemu-arm] [Qemu-devel] [RFC v3 3/3] ARM: KVM: Check KVM_CAP_ARM_IRQ_LINE_LAYOUT_2 for smp_cpus > 256

[Richard Henderson]

On 9/13/19 5:56 AM, Eric Auger wrote:
> Host kernel within [4.18, 5.3] report an erroneous KVM_MAX_VCPUS=512
> for ARM. The actual capability to instantiate more than 256 vcpus
> was fixed in 5.4 with the upgrade of the KVM_IRQ_LINE ABI to support
> vcpu id encoded on 12 bits instead of 8 and a redistributor consuming
> a single KVM IO device instead of 2.
> 
> So let's check this capability when attempting to use more than 256
> vcpus within any ARM kvm accelerated machine.
> 
> Signed-off-by: Eric Auger <address@hidden>

Reviewed-by: Richard Henderson <address@hidden>


r~