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Re: [PATCH v1 5/5] console: support multiple serial console simultaneously
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Jun 2025 14:48:54 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Jun 2025 12:49:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.05.2025 16:15, Marek Marczykowski-Górecki wrote:
> Previously only one serial console was supported at the same time. Using
> console=com1,dbgp,vga silently ignored all but last serial console (in
> this case: only dbgp and vga were active).
>
> Fix this by storing not a single sercon_handle, but an array of them, up
> to MAX_SERCONS entries. The value of MAX_SERCONS can be chosen in
> kconfig, the default (4) is arbitrary, inspired by the number of
> SERHND_IDX values.
>
> Make console_steal() aware of multiple consoles too. It can now either
> steal output from specific console (for gdbstub), or from all of them at
> once (for console suspend).
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> ---
> This was posted before as part of initial xhci console submission, it
> reached v6 (but last changes were in v4), but wasn't considered useful
> enough to review/ack:
> https://lore.kernel.org/xen-devel/Yu0XHUhsebE+WG0g@mail-itl/
>
> Since I needed this feature again, to debug xhci console issue, I'm
> including this patch again in the series.
Beyond this narrow aspect, has anything changed in the picture, compared
to what was said / discussed earlier on?
Jan
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