Re: getting the console output for s390 cdrom-test?

[Thomas Huth]

On 12/02/2021 13.05, Peter Maydell wrote:
> On Fri, 12 Feb 2021 at 11:45, Thomas Huth <thuth@redhat.com> wrote:
> > I guess Cornelia simply meant a:
> >
> >   asm volatile("nop":::"memory");
>
> That will force the compiler not to reorder, but it doesn't
> seem to me that it would really force the memory accesses to
> appear to the other host CPU thread that's running the device
> emulation. So either it's insufficient in the s390 memory model,
> or our s390 emulation isn't being sufficiently rigorous about
> implementing the memory model...

AFAIK s390x has a very strict memory ordering model... so maybe this is a 
problem with emulating a strict CPU on a less strict host CPU, indeed? ... 
CC:-ing Christian and Richard, maybe they have some additional ideas here...

 Thomas