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Re: [PATCH 0/3] Change XEN_DOMCTL_setvcpuaffinity interface
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 1 Jul 2026 17:34:07 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, George Dunlap <gwd@xxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@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: Wed, 01 Jul 2026 15:34:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 01.07.26 13:39, Jan Beulich wrote:
On 01.07.2026 13:16, Juergen Gross wrote:
Today the XEN_DOMCTL_setvcpuaffinity hypercall will not only change the
affinity settings of a vcpu, it will return the new effective settings,
too.
In case an error happens during this hypercall, the expectation of the
caller is that the affinity of the vcpu didn't change. This isn't true,
however, if passing the new effective affinity back to the user is
failing.
That'll be the caller's fault though. Any -EFAULT coming back are an
indication that the caller needs fixing.
The possible -ENOMEM isn't the callers fault, though.
Juergen
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