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Re: [PATCH v3] xen/common: add keyhandler to show Xen command line
- To: dmukhin@xxxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 12 Aug 2026 09:28:46 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, sstabellini@xxxxxxxxxx, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Wed, 12 Aug 2026 07:28:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.08.2026 22:56, dmukhin@xxxxxxxx wrote:
> On Tue, Aug 11, 2026 at 10:05:17AM +0200, Roger Pau Monné wrote:
>> On Mon, Aug 10, 2026 at 04:04:01PM -0700, dmukhin@xxxxxxxx wrote:
>>> +static int __init cf_check misc_init(void)
>>> +{
>>> + register_keyhandler('X', show_hypervisor_info,
>>> + "show hypervisor information", 0);
>>
>> "show hypervisor information" seems too generic to me, almost all
>> debug keys could be defined by this sentence TBH. I think this needs
>> to be more specific, but I'm not sure what's the plan regarding this
>> key. Is there an intention to print more stuff here, or just the
>> command line? Knowing the full set of information to be printed might
>> help come up with a better name.
>
> I will update to "show_cmdline" since I originally planed to expose Xen
> command line only so it is possible to better debug a system when dom0
> becomes almost unresponsive.
Yet as indicated already on v1 (I think) - a precious debug key character
for just the command line seems rather wasteful to me. If it's only the
command line, and if that _really_ needs exposing via a debug key (i.e.
if there are reasonable scenarios where "xl info" cannot be used), perhaps
attach it to e.g. the 'h' key output?
Jan
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