Re: [PATCH v4 2/6] hw/arm/virt: Add a control for the the highmem redistributors

[Marc Zyngier]

On Mon, 10 Jan 2022 15:47:47 +0000,
Peter Maydell <peter.maydell@linaro.org> wrote:
> 
> On Mon, 10 Jan 2022 at 15:45, Marc Zyngier <maz@kernel.org> wrote:
> > $ /home/maz/vminstall/qemu-hack -m 1G -smp 256 -cpu host -machine 
> > virt,accel=kvm,gic-version=3,highmem=on -nographic -drive 
> > if=pflash,format=raw,readonly=on,file=/usr/share/AAVMF/AAVMF_CODE.fd
> > qemu-hack: warning: Number of SMP cpus requested (256) exceeds the 
> > recommended cpus supported by KVM (8)
> > qemu-hack: warning: Number of hotpluggable cpus requested (256) exceeds the 
> > recommended cpus supported by KVM (8)
> > qemu-hack: Capacity of the redist regions(123) is less than number of 
> > vcpus(256)
> 
> Side question: why is KVM_CAP_NR_VCPUS returning 8 for
> "recommended cpus supported by KVM" ? Is something still
> assuming GICv2 CPU limits?

No, it is only that KVM_CAP_NR_VCPUS is defined as returning the
number of physical CPUs (and this test machine has only 8 of them).

        M.

-- 
Without deviation from the norm, progress is not possible.