Re: intermittent hang in qos-test for qemu-system-i386 on 32-bit arm host

[Peter Maydell]

On Sun, 11 Jul 2021 at 13:10, Coiby Xu <coiby.xu@gmail.com> wrote:
>
> Hi Peter,
>
> On Sat, Jul 10, 2021 at 02:30:36PM +0100, Peter Maydell wrote:
> >I've noticed recently that intermittently 'make check' will hang on
> >my aarch32 test system (really an aarch64 box with an aarch32 chroot).
>
> I have a newbie question. How do you do an aarch32 chroot on an aarch64
> box? At least, this issue seems to be not reproducible on an aarch64 box
> directly. I specifically ran the qos-test for 5 consecutive times and
> each time the test could finish successfully,

Your aarch64 host CPU needs to support aarch32 at EL0 (some
AArch64 CPUs are pure-64 bit these days). The host kernel needs
to implement the 32-bit compat layer. It probably also needs to be
built for 4K pages (which mostly means "not RedHat"). Then you can
set up the 32-bit chroot however you'd normally set up a chroot
(for Debian you can do this with debootstrap; other distros will vary;
schroot is also a bit nicer than raw chroot IMHO.)

-- PMM