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

'virsh hypervisor-cpu-baseline --migratable' generates non-intersection features:

<maxphysaddr mode='passthrough' limit='46'/>

This will cause the guest xml fail to validate on the host which does not support it.

Please provide the package NVR for which bug is seen:

Host A(rhel9.4):

libvirt-10.0.0-2.el9.x86_64

qemu-kvm-8.2.0-4.el9.x86_64

Host B(rhel9.2):
libvirt-9.0.0-10.3.el9_2.x86_64
qemu-kvm-7.2.0-14.el9_2.7.x86_64

How reproducible:
100%

Steps to reproduce
1.Execute 'virsh domcapabilities' on host A and check whether contain 'Maxphysaddr' feature:
#virsh domcapabilities > cpu-A.xml
#cat cpu-A.xml | grep -i Maxphysaddr
<maxphysaddr mode='passthrough' limit='46'/>

2.Execute 'virsh domcapabilities' on host B and check whether contain 'Maxphysaddr' feature:
#virsh domcapabilities > cpu-B.xml
#cat cpu-B.xml | grep -i Maxphysaddr
(no output)

3.Merge the above two files into one file(cpu.xml) and then execute 'virsh hypervisor-cpu-baseline cpu.xml --migratable' on host A:

1. virsh hypervisor-cpu-baseline cpu.xml --migratable 
   <cpu mode='custom' match='exact'>
     <model fallback='forbid'>Broadwell-noTSX-IBRS</model>
     <vendor>Intel</vendor>
     **<maxphysaddr mode='passthrough' limit='46'/>**
     <feature policy='require' name='vme'/>
     <feature policy='require' name='ss'/>
    ...
   </cpu>

4.Edit the guest with cpu settings as step 3's output:

1. virsh edit test
   error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
   Extra element cpu in interleave
   Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]: 

Expected results:
Should not generate features can not validate on one of the host.

Actual results
'virsh hypervisor-cpu-baseline --migratable' generates non-intersection features:<maxphysaddr/>