linux-kernel - Re: [PATCH 2/5] selftests/nolibc: use EFI -bios for LoongArch qemu

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Message-ID: <74f121c7-5356-4e58-87ca-e93fe48ccc39@t-8ch.de>
Date:   Tue, 24 Oct 2023 18:06:11 +0200 (GMT+02:00)
From:   Thomas Weißschuh  <thomas@...ch.de>
To:     Willy Tarreau <w@....eu>
Cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        Shuah Khan <shuah@...nel.org>,
        Zhangjin Wu <falcon@...ylab.org>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] selftests/nolibc: use EFI -bios for LoongArch qemu

Oct 22, 2023 11:21:16 Willy Tarreau <w@....eu>:

> On Tue, Oct 10, 2023 at 02:33:57PM +0200, Thomas Weißschuh wrote:
>> qemu for LoongArch does not work properly with direct kernel boot.
>> The kernel will panic during initialization and hang without any output.
>>
>> When booting in EFI mode everything work correctly.
>>
>> While users most likely don't have the LoongArch EFI binary installed at
>> least an explicit error about 'file not found' is better than a hanging
>> test without output that can never succeed.
>
> Agreed. Let's hope at least users will be able to figure what's
> missing depending on the message. There's one thing, though, you
> hard-coded the path to the file system, and it's unlikely to be
> located at the same place for everyone:
>
>    -bios /usr/share/edk2/loongarch64/OVMF_CODE.fd
>
> Sure, it's also possible to force QEMU_ARGS but it's becoming complicated
> due to the numerous arguments. Maybe use a QEMU_BIOS_loongarch variable
> for this ? This way if this starts to generalize to other archs, we can
> later simplify it and automatically append -bios when needed.

My hope was for it to be a purely temporary bandaid.
But you are right, let's do it properly from the beginning.

>> Link: https://lore.kernel.org/loongarch/1738d60a-df3a-4102-b1da-d16a29b6e06a@t-8ch.de/
>> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
>>
>> ---
>> Note: I'm wondering how this worked for anybody else.
>
> Not much surprised. As I mentioned, my qemu currently doesn't support
> loongarch so I didn't boot that one. Maybe Zhangjin had this one as
> part of his other patches.
>
> Overall, on the principle, Acked-by: Willy Tarreau <w@....eu>

Thanks!