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libvirt shouldn't allow an ambiguous XML configuration regarding CPU
topology. Example, what guest CPU config does the following XML represent?
<domain>
...
<vcpus>3</vcpus>
<cpu>
<topology sockets='2' cores='2' threads='2'/>
</cpu>
...
</domain>
It is unclear, and libvirt shouldn't accept that config. What I think libvirt
should do is make sockets= a readonly attribute that just mirrors the old style
<vcpus> value. We just throw out the any value the user passes for sockets= and sync with vcpus.
Then we clarify the docs that for HVM, <vcpus> is not 'logical guest
cpus' or anything like that, it represents a distinct socket to the guest. That
should allow people to edit <vcpus> like normal. And my understanding is that
HVs that do CPU hotplug do it at the socket level anyways, so setvcpus commands
still retain the correct semantics.
Some background: https://bugzilla.redhat.com/show_bug.cgi?id=708892#c2
libvirt shouldn't allow an ambiguous XML configuration regarding CPU topology. Example, what guest CPU config does the following XML represent? <domain> ... <vcpus>3</vcpus> <cpu> <topology sockets='2' cores='2' threads='2'/> </cpu> ... </domain> It is unclear, and libvirt shouldn't accept that config. What I think libvirt should do is make sockets= a readonly attribute that just mirrors the old style <vcpus> value. We just throw out the any value the user passes for sockets= and sync with vcpus. Then we clarify the docs that for HVM, <vcpus> is not 'logical guest cpus' or anything like that, it represents a distinct socket to the guest. That should allow people to edit <vcpus> like normal. And my understanding is that HVs that do CPU hotplug do it at the socket level anyways, so setvcpus commands still retain the correct semantics. Some background: https://bugzilla.redhat.com/show_bug.cgi?id=708892#c2