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Verify this bug with:
libvirt-8.5.0-7.3.el9_1.x86_64

1. prepare a win guest with guest agent device
# virsh domtime win2k19 
Time: 1669923955

2. config the virtqemud conf file
# grep -v ^# /etc/libvirt/virtqemud.conf 
log_outputs = "3:file:/var/log/libvirt/libvirtd.log"

3. restart virtqemud

4. Get guest disk info
# virsh guestinfo win2k19 --disk 
disk.count          : 1
disk.0.name         : \\.\PhysicalDrive0
disk.0.partition    : no
disk.0.serial       : QM00001

5. check the log
# cat /var/log/libvirt/libvirtd.log 
(no output)

As the testing result matches with the expected result. Mark the bug as verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (libvirt bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:0311