Issue

What were you trying to do that didn't work? CPU features that are listed as policy='require' in the host-model section of domcapabilities on one QEMU version are no longer listed as required after upgrading to a newer QEMU version on the same hardware. On machine type pc-q35-rhel9.6.0, the host-model CPU (EPYC-Rome) lists 32 features with policy='require'. After upgrading to pc-q35-rhel9.8.0 on the same host, only 25 features are listed - the following 7 are dropped: Removed features: arch-capabilities gds-no mds-no pschange-mc-no rdctl-no rfds-no skip-l1dfl-vmentry If a CPU feature is supported and required in a given version, it should remain supported and required after upgrading to a newer version on the same hardware. The underlying CPU has not changed. Please provide the package NVR for which the bug is seen: How reproducible is this bug?: 100% Steps to reproduce On an Intel amd64 host, query virsh domcapabilities with QEMU machine type pc-q35-rhel9.6.0 Note the host-model CPU features with policy='require' (32 features) Upgrade QEMU to rhel9.8.0 Query virsh domcapabilities with machine type pc-q35-rhel9.8.0 Note the host-model CPU features with policy='require' (25 features, 7 dropped) Expected results All features that were required before the upgrade should still be required after the upgrade on the same hardware Actual results 7 features dropped

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Done-Errata