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Re: [PATCH v7] xen/domain: introduce DOMID_ANY
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>, dmukhin@xxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 22 Apr 2026 16:23:49 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, andrew.cooper3@xxxxxxxxxx, jbeulich@xxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx
- Delivery-date: Wed, 22 Apr 2026 14:23:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.04.26 16:07, Anthony PERARD wrote:
On Wed, Apr 08, 2026 at 04:40:46PM -0700, dmukhin@xxxxxxxx wrote:
From: Denis Mukhin <dmukhin@xxxxxxxx>
Add a new symbol DOMID_ANY to improve the readability of the code.
Update all relevant domid_alloc() call sites and harden the domid_alloc()
input value check.
Also, fix problem with passing invalid domain IDs in
XEN_DOMCTL_createdomain: turns out libxl__domain_make() (toolstack)
uses 0xffff as domain ID.
Amends: 2d5065060710 ("xen/domain: unify domain ID allocation")
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
Changes since v6:
- fixed libxl_domid_valid_guest() check in libxl_create.c
- Link to v6:
https://lore.kernel.org/xen-devel/20260307025451.3148078-2-dmukhin@xxxxxxxx/
- CI: https://gitlab.com/xen-project/people/dmukhin/xen/-/pipelines/2438790748
Unfortunattly, this patch breaks tests in tools/tests, see
https://gitlab.com/xen-project/hardware/xen-staging/-/pipelines/2471684142
The tests produces this:
Running /usr/lib/xen/tests/test-mem-claim
Memory claims tests
Free pages: 3059012, Oustanding claims: 0
Domain create failure: 17 - File exists
FAILED: /usr/lib/xen/tests/test-mem-claim
Running /usr/lib/xen/tests/test-paging-mempool
Paging mempool tests
Domain create failure: 17 - File exists
FAILED: /usr/lib/xen/tests/test-paging-mempool
I've looked into this one. The input domid is 0 here, which will be rejected
now.
I guess the other failing cases have the same issue.
I have one request: could the definition of DOMID_ANY be split out into a
patch of its own? I have a security related patch series pending which
would need that definition for another purpose (not an XSA, though).
Juergen
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