i'm seeing a regression on Fedora 42 kernel 6.15.4 -> 6.15.5 on AMD Ryzen 5
5600G host (x86_64)
kvm guests that launch ok under kernels 6.15.[3,4] fail with the following
error when attempting to autostart under 6.15.5:
internal error: Failed to autostart VM: operation failed: guest CPU
doesn't match specification: missing features: sbpb,ibpb-brtype
no changes made to libvirt, qemu, or VM defs between kernel versions.
re-booting to old kernel versions restores expected behavior.
maybe related (?) to recent changes in AMD CPU feature exposure / mitigation
handling in kernel 6.15.5?
i've opened a bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2379784
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