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Re: [PATCH v2 2/2] libacpi: Remove CPU hotplug and GPE handling from PVH DSDTs
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- Date: Thu, 11 Sep 2025 17:36:08 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 11 Sep 2025 15:36:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu Sep 11, 2025 at 5:07 PM CEST, Jan Beulich wrote:
> On 11.09.2025 13:53, Alejandro Vallejo wrote:
>> PVH guests have no DM, so this causes the guest to fetch the online CPU
>> bitmap from an unbacked 0xaf00 PIO port when executing the GPE handler.
>>
>> Seeing how ACPI CPU hotplug is the only event delivered via GPE, remove
>> the GPE handler in addition to anything ACPI CPU hotplug related.
>>
>> This shrinks PVH's DSDT substantially and prevents spuriously executing
>> a large amount of AML with no purpose at all.
>>
>> Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Thanks
>
>> ---
>> v2:
>> * Adjusted commit message
>> * All other tags except S-by moved to patch 1.
>
> This will want backporting; I expect finding a suitable commit for a Fixes:
> tag is somewhat difficult.
>
> Jan
I'd say it's the patch that needlessly enabled GPE handling on PVH.
Fixes: 062975dc9441("acpi: PVH guests need _E02 method")
Cheers,
Alejandro
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