Re: [RFC PATCH] tests/tcg: drop -cpu max from s390x sha512-mvx invocation

[Thomas Huth]

On 09/03/2022 12.22, Alex Bennée wrote:
> With -cpu max we get a warning:
>
>    qemu-s390x: warning: 'msa5-base' requires 'kimd-sha-512'.
>
> But dropping the -cpu max and it still runs fine.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Cc: Thomas Huth <thuth@redhat.com>
> ---
>   tests/tcg/s390x/Makefile.target | 2 --
>   1 file changed, 2 deletions(-)
>
> diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
> index 257c568c58..7aa502a557 100644
> --- a/tests/tcg/s390x/Makefile.target
> +++ b/tests/tcg/s390x/Makefile.target
> @@ -34,6 +34,4 @@ sha512-mvx: CFLAGS=-march=z13 -mvx -O3
>   sha512-mvx: sha512.c
>         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS)
>   
> -run-sha512-mvx: QEMU_OPTS+=-cpu max
> -
>   TESTS+=sha512-mvx

Ok, this helps to get rid of the warnings, thus feel free to add:

Tested-by: Thomas Huth <thuth@redhat.com>

However, the error still persists. I now had a closer look by running the 
test with "qemu-s390x" on my z15 machine directly, and all tests are 
failing! The problem happens with both, gcc v11.2.1 and clang v13.0.1. The 
problem goes away (i.e. test works fine) if I compile the code with -O1 
instead of -O3, or if I use GCC v8.5 instead. I'll try to find out more, but 
as a temporary workaround, we could also switch to -O1 instead of -O3.

 Thomas