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Re: [XEN][PATCH 0/5] x86: pvh: allow to disable 32-bit (COMPAT) interface support
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- Date: Wed, 12 Nov 2025 15:21:24 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Michal Orzel" <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, "Stefano Stabellini" <sstabellini@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>
- Delivery-date: Wed, 12 Nov 2025 14:21:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed Nov 12, 2025 at 11:58 AM CET, Teddy Astie wrote:
> Le 11/11/2025 à 18:55, Grygorii Strashko a écrit :
>> From: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
>>
>> Hi
>>
>> This series introduces possibility to disable 32-bit (COMPAT) interface
>> support
>> in the following cases:
>> - Only PVH domains are used
>
> I assume this one is mostly due to hvmloader being today running in
> protected mode 32-bits rather than a limitation "HVM" itself. I don't
> think of anything else preventing HVM (with 64-bits guests or 32-bits
> ones without Xen support) from working with COMPAT disabled.
It is indeed because hvmloader makes hypercalls. Otherwise HVM would work too.
Cheers,
Alejandro
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