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

Start a vm with custom cpu model, them virtqemud crash.

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

libvirt-10.10.0-6.el10.aarch64

How reproducible is this bug?:

100%

Steps to reproduce

1. Define vm using below cpu model setting

2.   <cpu mode='custom' match='exact' check='partial'>    <model fallback='allow'>sddcortex-a57</model>  </cpu>

3. Start vm
4.  

Expected results

VM starts normally

Actual results

[root@ampere-mtcollins-altra-02 coredump]# virsh start avocado-vt-vm1
error: Disconnected from qemu:///system due to end of file
error: Failed to start domain 'avocado-vt-vm1'
error: End of file while reading data: Input/output error

1. coredumpctl list

Thu 2025-02-27 22:23:01 EST 163224   0   0 SIGSEGV present  /usr/sbin/virtqemud   1.3M

See attachment for full backtrace