linux-kernel - Re: [PATCH 06/13] selftests/nolibc: allow specify a bios for qemu

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Message-Id: <20230526102518.150058-1-falcon@tinylab.org>
Date:   Fri, 26 May 2023 18:25:18 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     thomas@...ch.de
Cc:     falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org,
        palmer@...belt.com, paul.walmsley@...ive.com, w@....eu
Subject: Re: [PATCH 06/13] selftests/nolibc: allow specify a bios for qemu

Hi, Thomas

> On 2023-05-25 01:52:29+0800, Zhangjin Wu wrote:
> > riscv qemu has a builtin bios (opensbi), but it may not match the latest
> > kernel and some old versions may hang during boot, let's allow user pass
> > a newer version to qemu via the -bios option.
> 
> Nitpick:
> 
> This seems very specific and hopefully only necessary temporarily.
>

RISC-V is such a new ISA and the Spec (especially the SBI) changes very
frequently ;-)

> Instead it could be changed to some generic mechanim like
> "QEMU_ARGS_EXTRA"?
>

Good point, will apply it.

Thanks,
Zhangjin

> > we can use it like this:
> > 
> >     $ make run BIOS=/path/to/new-bios ...
> > 
> > Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
> > ---
> >  tools/testing/selftests/nolibc/Makefile | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
> > index 9adc8944dd80..9213763ab3b6 100644
> > --- a/tools/testing/selftests/nolibc/Makefile
> > +++ b/tools/testing/selftests/nolibc/Makefile
> > @@ -70,7 +70,8 @@ QEMU_ARGS_mips       = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
> >  QEMU_ARGS_riscv      = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
> >  QEMU_ARGS_s390       = -M s390-ccw-virtio -m 1G -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
> >  QEMU_ARGS_loongarch  = -M virt -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
> > -QEMU_ARGS            = $(QEMU_ARGS_$(ARCH))
> > +QEMU_ARGS_BIOS       = $(if $(BIOS),-bios $(BIOS))
> > +QEMU_ARGS            = $(QEMU_ARGS_$(ARCH)) $(QEMU_ARGS_BIOS)
> >  
> >  # OUTPUT is only set when run from the main makefile, otherwise
> >  # it defaults to this nolibc directory.