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

As subject

What is the impact of this issue to you?

Get the incorrect info

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

file-5.39-16.el9.x86_64
libvirt-10.9.0-1.el9.x86_64
qemu-kvm-9.1.0-3.el9.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

1. Set save_image_format="xz" in /etc/libvirt/qemu.conf. Then restart virtqemud

➜  ~ grep save_image_format /etc/libvirt/qemu.conf
save_image_format = "xz"
➜  ~ systemctl restart virtqemud

1. Create a running domain:

➜  ~ virt-install --location https://mirrors.163.com/centos-vault/8.5.2111/BaseOS/x86_64/os/ -n centos --disk size=10 -r 4096
➜  ~ virsh list 
 Id   Name     State
------------------------
 1    centos   running

1. Save the domain and check the domain state image

➜  ~ virsh save centos  /tmp/centos.sav     
Domain 'centos' saved to /tmp/centos.sav
➜  ~ file /tmp/centos.sav
/tmp/centos.sav: Libvirt QEMU Suspend Image, version 2, XML length 72300, running

Expected results

/tmp/centos.sav: Libvirt QEMU Suspend Image, version 2, XML length 72300, running, compressed

Actual results

File doesn't report the image file is compressed.