Re: Unexpected error in rme_configure_one() at ../target/arm/kvm-rme.c:159

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

Hi Itaru,

On Fri, May 31, 2024 at 10:57:13AM +0100, Peter Maydell wrote:
> On Fri, 31 May 2024 at 05:20, Itaru Kitayama <itaru.kitayama@linux.dev> wrote:
> >
> >
> >
> > > On May 30, 2024, at 22:30, Philippe Mathieu-Daudé <philmd@linaro.org> wrote:
> > >
> > > Cc'ing more developers
> > >
> > > On 30/5/24 06:30, Itaru Kitayama wrote:
> > >> Hi,
> > >> When I see a Realm VM creation fails with:
> > >> Unexpected error in rme_configure_one() at ../target/arm/kvm-rme.c:159:
> > >> qemu-system-aarch64: RME: failed to configure SVE: Invalid argument
> > >> test.sh: line 8:  2502 Aborted                 qemu-system-aarch64 -M 'virt,acpi=off,gic-version=3' -cpu host -enable-kvm -smp 2 -m 512M -overcommit 'mem-lock=on' -M 'confidential-guest-support=rme0' -object 'rme-guest,id=rme0,measurement-algo=sha512,num-pmu-counters=6,sve-vector-length=256' -kernel Image -initrd rootfs.cpio -append 'earycon console=ttyAMA0 rdinit=/sbin/init' -nographic -net none
> > >> do I need to suspect first the VMM, QEMU, or the Image? The kernel is built with LLVM, does it matter?
> > >> Thanks,
> > >> Itaru.
> > >
> >
> > I’m testing Jean’s repo at:
> >
> > https://git.codelinaro.org/linaro/dcap/qemu/-/tree/cca/v2?ref_type=heads

Thanks again for testing, you can report issues by replying directly to
my posting, so I can get to them quicker. If you want I can Cc you on the
next one. The latest is:

[PATCH v2 00/22] arm: Run CCA VMs with KVM
https://lore.kernel.org/qemu-devel/20240419155709.318866-2-jean-philippe@linaro.org/

That does sound like the KVM host doesn't support SVE, but the QEMU VMM
version is also too old: in the latest series 'sve-vector-length' was
removed and we use the existing -cpu parameters to configure SVE. Please
make sure that the QEMU branch is cca/v2 to match the Linux KVM branch,
because the older QEMU patches doesn't work with the newest KVM patches.
You'll need to update the command-line as well, because paramaters have
changed for cca/v2.

This may be the case of older build directories that aren't properly
synchronized. They can be removed manually but the quicker way is usually
to remove all source and build directories and start anew.

Thanks,
Jean


> 
> OK, we should cc Jean-Philippe then.
> 
> I'm wondering if this is as simple as "RME via KVM doesn't support SVE yet",
> perhaps.
> 
> thanks
> -- PMM