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Re: [PATCH v5] xen/common: add keyhandler to show Xen command line
- To: dmukhin@xxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Aug 2026 08:00:11 +0200
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger@xxxxxxxxxxxxxx, sstabellini@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 13 Aug 2026 06:00:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.08.2026 05:51, dmukhin@xxxxxxxx wrote:
> From: Denis Mukhin <dmukhin@xxxxxxxx>
>
> Currently there's no way to print Xen command line on the emergency
> console for debugging purposes when 'xl' is unavailable.
>
> Add new keyhander '?' to do command line printout.
>
> To allow built-in command printout, drop __initconst in
> 'opt_builtin_cmdline' declaration.
>
> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
> ---
> Changes since v4:
> - promote opt_builtin_cmdline to __ro_after_init and use it for
> built-in command line reporting
> - account for empty saved_cmdline
> - adjust register_keyhandler() call - use '?'
This isn't quite what I was expecting, following the feedback you got on
v4. My expectation was that we'd see a 2-patch series, first patch moving
non-help stuff out of the 'h' handler, second patch adding the dumping of
the command line. Naturally the new handler then wouldn't be named
show_cmdline(). I'd then further expect tat no new use of
register_keyhandler() would be necessary: The handler itself would live
in keyhandler.c, and print_version() would then be accompanied by a new
print_cmdline().
Jan
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