linux-kernel - [PATCH] kunit: tool: Use qboot on QEMU x86

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Message-ID: <20250124-kunit-qboot-v1-1-815e4d4c6f7c@google.com>
Date: Fri, 24 Jan 2025 11:01:42 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Brendan Higgins <brendan.higgins@...ux.dev>, David Gow <davidgow@...gle.com>, 
	Rae Moar <rmoar@...gle.com>
Cc: linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-kernel@...r.kernel.org, Brendan Jackman <jackmanb@...gle.com>
Subject: [PATCH] kunit: tool: Use qboot on QEMU x86_64

As noted in [0], SeaBIOS (QEMU default) makes a mess of the terminal,
qboot does not.

It turns out this is actually useful with kunit.py, since the user is
exposed to this issue if they set --raw_output=all.

qboot is also faster than SeaBIOS, but it's is marginal for this
usecase.

[0] https://lore.kernel.org/all/CA+i-1C0wYb-gZ8Mwh3WSVpbk-LF-Uo+njVbASJPe1WXDURoV7A@mail.gmail.com/

Both SeaBIOS and qboot are x86-specific.

Signed-off-by: Brendan Jackman <jackmanb@...gle.com>
---
 tools/testing/kunit/qemu_configs/x86_64.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/kunit/qemu_configs/x86_64.py b/tools/testing/kunit/qemu_configs/x86_64.py
index dc794907686304b325dbe180149169dd79bcd44f..4a6bf4e048f5b05c889e3b9b03046f14cc9b0bcc 100644
--- a/tools/testing/kunit/qemu_configs/x86_64.py
+++ b/tools/testing/kunit/qemu_configs/x86_64.py
@@ -7,4 +7,6 @@ CONFIG_SERIAL_8250_CONSOLE=y''',
 			   qemu_arch='x86_64',
 			   kernel_path='arch/x86/boot/bzImage',
 			   kernel_command_line='console=ttyS0',
-			   extra_qemu_params=[])
+			   # qboot is faster than SeaBIOS and doesn't mess up
+			   # the terminal.
+			   extra_qemu_params=['-bios', 'qboot.rom'])

---
base-commit: 8ea24baaaa869adeb39c6b9ce7542657a7251b56
change-id: 20250124-kunit-qboot-5201945f7e86

Best regards,
-- 
Brendan Jackman <jackmanb@...gle.com>