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Re: [PATCH v4 2/3] xen/mm: allow deferred scrub of physmap populate allocated pages
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 28 Jan 2026 15:34:11 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Wed, 28 Jan 2026 14:34:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.01.2026 14:33, Roger Pau Monné wrote:
> On Wed, Jan 28, 2026 at 12:44:26PM +0000, Andrew Cooper wrote:
>> In principle we could assert that it's already NULL in _domain_destroy()
>> which might help catch an error if it gets set early but the domain
>> destroyed before getting into the domlist, but that seems like a rather
>> slim case.
>
> Given my understanding of the logic in the XENMEM_ hypercalls, I think
> toolstack can still target domains in the process of being destroyed,
> at which point we need to keep a final cleanup instance
> _domain_destroy(), or otherwise adjust XENMEM_populate_physmap
> hypercall (and others?) so they can't target dying domains.
Considering that these requests will fail for dying domains because of the
check in assign_pages(), it may indeed make sense to have another earlier
check for the purposes here. Otoh doing this early may not buy us very
much, as the domain may become "dying" immediately after the check. Whereas
switching stash_allocation()'s if() to
if ( d->pending_scrub || d->is_dying )
looks like it might do.
Jan
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