What were you trying to do that didn't work?

I tried to manage Intel MBEC CPU flags with libvirt.

What is the impact of this issue to you?

Would be great if I could express that I like to ensure that my VM provides either Intel MBEC or AMD GMET, so that the performance of my Windows guest is not degraded.

In addition, I like to ensure that the I can create VMs which can benefit from Intel MBEC or AMD GMET without cpu host-passthrough, but with host-model and other libvirt managed cpu capabilities.

Please provide the package NVR for which the bug is seen:

libvirt-11.10.0-4.el10.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

1.  grep ept_mode_based_exec /proc/cpuinfo | head -1
2. export MACHINE=q35 
   export ARCH=x86_64
   export VIRTTYPE=kvm
   virsh domcapabilities --machine $MACHINE --arch $ARCH --virttype $VIRTTYPE | virsh hypervisor-cpu-baseline --features /dev/stdin --machine $MACHINE --arch $ARCH --virttype $VIRTTYPE

Expected results

ept_mode_based_exec is reflected by libvirt