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Re: [PATCH v8 1/2] xen/console: handle multiple domains using console_io hypercalls
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 4 Feb 2026 08:14:38 +0100
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- Cc: Stefano Stabellini <stefano.stabellini@xxxxxxx>, grygorii_strashko@xxxxxxxx, anthony.perard@xxxxxxxxxx, michal.orzel@xxxxxxx, julien@xxxxxxx, roger.pau@xxxxxxxxxx, jason.andryuk@xxxxxxx, victorm.lira@xxxxxxx, andrew.cooper3@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 04 Feb 2026 07:14:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.02.2026 00:02, Stefano Stabellini wrote:
> On Tue, 3 Feb 2026, Jan Beulich wrote:
>> On 29.01.2026 23:08, Stefano Stabellini wrote:
>>> @@ -555,7 +566,10 @@ static void console_switch_input(void)
>>>
>>> if ( next_rx++ >= max_console_rx )
>>> {
>>> + nrspin_lock_irq(&console_lock);
>>
>> As indicated earlier, you can't know IRQ state in anything down the call
>> tree from serial_rx().
>
> I'll switch to the irqsave/restore versions in console_switch_input
I've seen that you already sent v9, but seeing how getting the locking right
has proven to be difficult, I have two more remarks towards this.
1) Can the locking additions to existing code please be split out into a
separate patch?
2) As all of this is for dom0less only (for now at least), did you consider
to make all of these changes dependent upon a new Kconfig option, so to
avoid impacting other environments in case issues remain when this has
gone in?
Jan
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