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Re: [PATCH 3/9] xen/gnttab: limit cache flush operation to guests allowed cache control

To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
From: Julien Grall <julien@xxxxxxx>
Date: Tue, 6 May 2025 11:15:09 +0100
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
Delivery-date: Tue, 06 May 2025 10:15:25 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Hi Roger,

On 06/05/2025 09:31, Roger Pau Monne wrote:

Whether a domain is allowed to issue cache-control operations is reported
by the cache_flush_permitted() check.  Introduce such check to limit the
availability of GNTTABOP_cache_flush to only guests that are granted cache
control.

Can you outline what's the problem you are trying to solve? Asking,because I don't see the problem of allowing any guest callingGNTTABOP_cache_flush on Arm from any domains.


Cheers,

--
Julien Grall

Follow-Ups:
- Re: [PATCH 3/9] xen/gnttab: limit cache flush operation to guests allowed cache control
  - From: Roger Pau Monné

References:
- [PATCH 0/8] xen: cache control improvements
  - From: Roger Pau Monne
- [PATCH 3/9] xen/gnttab: limit cache flush operation to guests allowed cache control
  - From: Roger Pau Monne

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