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Cloning BZ for qemu-kvm-rhev.

+++ This bug was initially created as a clone of Bug #1760565 +++

This will be necessary if we decide to implement the equivalent of bz#1697627 in RHEL-7.

+++ This bug was initially created as a clone of Bug #1747185 +++

Description of problem:
Without the "filtered-features" QOM property, libvirt won't be able to use MSR features for mode='host-model'.

Version-Release number of selected component (if applicable):
qemu-kvm-2.12.0-85.module+el8.1.0+4010+d6842f29.x86_64

How reproducible:
Always


Steps to Reproduce:
Run "virsh domcapabilities" on a machine that has arch_capabilities on /proc/cpuinfo.

Actual results:
None of the arch-capabilities bits (rdctl-no, ibrs-all, rsba, skip-l1dfl-vmentry, ssb-no, mds-no) are reported by "virsh domcapabilities".


Expected results:
arch-capabilities bits should be reported by "virsh capabilities".

Additional info:
Problem detected during testing of bug 1697627.