arm64/for-kernelci baseline: 14 runs, 4 regressions (v6.12-rc3-67-gb9e20acb61ba)

[Peter Maydell]

On Thu, 17 Oct 2024 at 13:13, Catalin Marinas <catalin.marinas at arm.com> wrote:
>
> On Thu, Oct 17, 2024 at 12:50:42PM +0100, Peter Maydell wrote:
> > On Thu, 17 Oct 2024 at 12:34, Catalin Marinas <catalin.marinas at arm.com> wrote:
> > > At least the boot log is shown (for this email, others point to missing
> > > pages). However, it looks more like a Qemu bug, something about SME it
> > > doesn't like:
> > >
> > > ERROR:target/arm/internals.h:923:regime_is_user: code should not be reached
> > > Bail out! ERROR:target/arm/internals.h:923:regime_is_user: code should not be reached
> > >
> > > I tried Qemu 7.2.0 and 8.2.4, both from Debian (stable and unstable).
> > > Adding Peter, maybe he has any idea.
> >
> > Yeah, we shouldn't be hitting asserts (to state the obvious).
> >
> > If you can provide the QEMU command line and the kernel/etc
> > files needed to run it, I can have a look.
>
> The kernel defconfig should be sufficient to trigger it. It must be the
> for-kernelci branch from here:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/
>
> My qemu command line is:
>
> qemu-system-aarch64 \
>         -machine virt,gic_version=3,mte=on \
>         -cpu max \
>         -smp 2 -m 2G \
>         -kernel </path/to/Image> \
>         -semihosting -nographic \
>         -serial mon:stdio \
>         -monitor tcp:0.0.0.0:4000,server,nowait \
>         -netdev user,id=net0,hostfwd=tcp:0.0.0.0:4022-:22 \
>         -device virtio-net-device,netdev=net0 \
>         -object rng-random,filename=/dev/urandom,id=rng0 \
>         -device virtio-rng-pci,rng=rng0 \
>         -append 'console=ttyAMA0 earlycon=pl011,0x9000000 loglevel=9 ip=dhcp root=/dev/nfs rw nfsroot=<ip-addr>:/srv/nfs/debian-arm64,tcp,v4 kasan.mode=sync'

Thanks. This turns out to be a bug in our FEAT_E0PD
emulation which you'll hit if the guest enables
E0PD by setting th TCR_ELx bits. The fix is
straightforward and I've just sent a patch to qemu-devel:

https://lore.kernel.org/qemu-devel/20241017172331.822587-1-peter.maydell@linaro.org/T/#u

-- PMM