There also was the discussion (on this bug) to re-probe on reboots in general.
That was already discussed upstream multiple times, but didn't happen to be 
implemented so far.
There is some pro (more reliable data) and con (this is really a heavy task) to 
this.

See discussions on:
=> https://www.redhat.com/archives/libvir-list/2017-October/msg00916.html
=> https://www.redhat.com/archives/libvir-list/2018-January/msg00657.html

So far the outcome always was to add just another minor check for
whatever new case was identified instead of really probing all again on
each reboot.

For some stuff that was mentioned in IRC discussions:
In no way seems "refresh on libvirtd restart" an option.
=> https://www.redhat.com/archives/libvir-list/2018-December/msg00722.html
=> https://www.redhat.com/archives/libvir-list/2019-January/msg00061.html
=> https://www.redhat.com/archives/libvir-list/2018-September/msg00662.html

Nor "provide something nicer than rm xml files"
=> https://www.redhat.com/archives/libvir-list/2018-November/msg00614.html


For all the MDS and its predecessors I wonder if "/proc/cpuinfo flags" would be 
another good candidate going forward to polish the existing caching mechanism 
even further. I might send an RFC about that, but will look at back-portability 
of the existing first.

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https://bugs.launchpad.net/bugs/1830268

Title:
  libvirt caches nested vmx capability (in domcapabilities)

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