Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3;
Date:   Sun, 22 Oct 2023 11:20:46 +0200
From:   Willy Tarreau <w@1wt.eu>
To:     Thomas =?iso-8859-1?Q?Wei=DFschuh?= <linux@weissschuh.net>
Cc:     Shuah Khan <shuah@kernel.org>, Zhangjin Wu <falcon@tinylab.org>,
        linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/5] selftests/nolibc: use EFI -bios for LoongArch qemu
Message-ID: <20231022092046.GC2669@1wt.eu>
References: <20231010-nolibc-out-of-tree-v1-0-b6a263859596@weissschuh.net>
 <20231010-nolibc-out-of-tree-v1-2-b6a263859596@weissschuh.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20231010-nolibc-out-of-tree-v1-2-b6a263859596@weissschuh.net>
User-Agent: Mutt/1.10.1 (2018-07-13)
Precedence: bulk

Hi Thomas,

On Tue, Oct 10, 2023 at 02:33:57PM +0200, Thomas Wei?schuh 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.

> Link: https://lore.kernel.org/loongarch/1738d60a-df3a-4102-b1da-d16a29b6e06a@t-8ch.de/
> Signed-off-by: Thomas Wei?schuh <linux@weissschuh.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@1wt.eu>

Thanks!
Willy