Re: [PULL 00/11] target-arm queue

[Peter Maydell]

On Fri, 1 Nov 2019 at 10:34, Peter Maydell <address@hidden> wrote:
>
> On Fri, 1 Nov 2019 at 09:54, Andrew Jones <address@hidden> wrote:
> > Darn it. Sorry about that, but if it's still failing then I think QEMU
> > must believe KVM is enabled, i.e. kvm_enabled() in QEMU must be true.
> > I can try to confirm that and fix it, but I'll need to set up this
> > environment first.
>
> Yeah, it looks like trying to run with KVM in an aarch32 chroot
> doesn't work but we don't notice it -- in qemu kvm_init() succeeds
> but then we fail when we try to actually create CPUs, so:
> $ ./arm-softmmu/qemu-system-arm -M virt -M accel=kvm:tcg
> qemu-system-arm: kvm_init_vcpu failed: Invalid argument
>
> we barf rather than falling back to tcg the way we ought to.

I spoke to Christoffer and Marc about this, and they reckoned
this was basically a kernel bug (and ideally a 64-bit kernel
should just refuse to open /dev/kvm for an aarch32-compat
userspace process, because it doesn't provide the aarch32 KVM
interface, only the aarch64 one).

In the meantime, we should just bodge whatever we need to
in this test to cause us not to bother to try to run the test,
in whatever is the most expedient way.

thanks
-- PMM