Re: [PATCH v3 1/2] hw/arm/imx8mp-evk: Add KVM support

[Peter Maydell <peter.maydell@linaro.org>]

On Mon, 17 Nov 2025 at 17:13, Cornelia Huck <cohuck@redhat.com> wrote:
> Running current master (resp. with this patch applied), I'm getting make
> check failures on an aarch64 (Mt. Snow) host ("qemu-system-aarch64:
> unknown type 'arm-gicv3'" while using this machine); going back right
> before this patch, everything works fine. Haven't tried to debug this
> yet (maybe I'm the one with the weird config again...)

Is this a KVM-only config (no TCG) ?

I think this happens because the KConfig now says
+    depends on TCG || KVM

but because the machine by default doesn't use KVM then
trying to run the machine with no extra arguments falls
over if TCG isn't present.

This thing we put in to handle "creation of the SoC object
via device introspection means it doesn't have an ms->cpu_type
to look at":

+    const char *cpu_type = ms->cpu_type ?: ARM_CPU_TYPE_NAME("cortex-a53");

also probably won't do anything useful under a KVM-only config.

I think the simplest thing here is to put the KConfig back to:

  depends on TCG && AARCH64

People building a KVM-only config almost certainly do not
want this machine type and its devices, because the main
reason to build KVM-only is because you're in the
"virtualization use case" and want to not build in a
load of not-security-supported machine types.

thanks
-- PMM