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Re: [PATCH] xen/dom0less: Clear xenstore page
- To: Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 21 Aug 2025 07:26:44 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Thu, 21 Aug 2025 05:27:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.08.25 23:12, Jason Andryuk wrote:
C Xenstored was seen failing to map a domU's event channel. Enhancing
Xen's error messages shows:
common/event_channel.c:427:d0v0 EVTCHNOP failure: d1, port 3267543746 error -22
Port 3267543746 is 0xc2c2c2c2 - SCRUB_PATTERN.
Xenstore expects a non-zero evtchn_port to be valid. Explicitly zero
the page to avoid this.
Fixes: f78895ad78c9 ("tools/xenstored: Read event channel from xenstored page")
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
---
Tweaked stubdom & dom0less C xenstored pipeline success:
Test CI pipeline:
https://gitlab.com/xen-project/people/jandryuk-amd/xen/-/pipelines/1994879466
Example failure:
https://gitlab.com/xen-project/people/jandryuk-amd/xen/-/jobs/11084356847
Alternatively, a fixes could be:
Fixes: df2c03e2ebfe ("xen/arm: Alloc XenStore page for Dom0less DomUs from
hypervisor")
If the page should have been zero from the start.
I think this one is better. Either with or without the Fixes: tag changed:
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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