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Re: [PATCH v6 3/7] xen/events: allow setting of global virq handler only for unbound virqs
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Tue, 7 Jan 2025 17:10:05 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 07 Jan 2025 16:10:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.01.25 16:38, Jan Beulich wrote:
On 07.01.2025 11:17, Juergen Gross wrote:
XEN_DOMCTL_set_virq_handler will happily steal a global virq from the
current domain having bound it and assign it to another domain. The
former domain will just never receive any further events for that
virq without knowing what happened.
Yet - see my reply on patch 2 - it may actually have been intentional to
be this way, in case the new domain is indeed the designated new handler.
Otherwise such a transfer would require more coordination - the original
owner would first need to unbind, then signal the completion thereof to
the new owner.
Yes, like today's handling of xenstored live update.
It is the natural way to do that, as that coordination needs to be happening
anyway, as I've outlined in my response to your remark on patch 2.
Juergen
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