Re: [PATCH v5 03/11] target/arm: Restrict ARMv4 cpus to TCG accel

[Peter Maydell]

On Sat, 30 Jan 2021 at 18:36, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> Hi Peter,
>
> On 1/30/21 4:37 PM, Peter Maydell wrote:
> > On Sat, 30 Jan 2021 at 01:52, Philippe Mathieu-Daudé <f4bug@amsat.org> 
> > wrote:
> >>
> >> KVM requires a cpu based on (at least) the ARMv7 architecture.
> >
> > These days it requires ARMv8, because we dropped 32-bit host
> > support, and all 64-bit host CPUs are v8.
>
> Oh, this comment is about the target, to justify it is pointless to
> include pre-v7 target cpus/machines in a KVM-only binary.
>
> I'll update as:
>
> "KVM requires the target cpu based on (at least) the ARMv7
> architecture."

KVM requires the target CPU to be at least ARMv8, because
we only support the "host" cpu type, and all KVM host CPUs
are v8, which means you can't pass a v7 CPU as the target CPU.
(This used to not be true when we still supported running
KVM on a v7 CPU like the Cortex-A15, in which case you could
pass it to the guest.)

thanks
-- PMM