Comment 5 for bug 1921754

Report on giving this a first shot for a Focal backport to experiment with it.
The patches are (as expected) not too messy or non-applicable.

Qemu backporting
 143c30d4 already applied due to bug 1882774
 5cb287d2 noise for missing the less used/requested
    353f98c9 avx512-vp2intersect
    b3c7344e tsx-ldtrk
 5447089c applies as-is
 623972ce applies as-is

Libvirt backporting
 6ea3bb19 already applied due to bug 1887490
 892b7c70 already applied due to bug 1887490
 96a39aad already applied due to bug 1887490
 8c5c660b applies as-is
 5c17a7ba applies as-is
 5ac6ab2f applies as-is
 f321a482 some whitespace damage
 d3de79db neededs to be adapted meson->make
 b5abf9a1 sync_qemu_cpu_i386 didn't exist before v6.10

Started building in:
 https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4524

@Markus - if you could test these as time permits that would be great.
Do whatever you usually do with them, but if - in addition - you could check
what happens on live migrations from old to the upgraded package, that would
be awesome.