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

There should be error msg prompt when defining domain with 2 virtio-mem devices with same address base, like dimm device or nvdimm device.

Please provide the package NVR for which bug is seen:

1. rpm -q libvirt
   libvirt-9.5.0-7.el9_3.x86_64

   How reproducible:

100%

Steps to reproduce

1. Define domain with 2 virtio-mem devices with same address base:

<memory model='virtio-mem'>
<target>
<size unit='KiB'>131072</size>
<node>0</node>
<block unit='KiB'>2048</block>
<requested unit='KiB'>131072</requested>
<address base="0x100000000"/>
</target>
</memory>

<memory model='virtio-mem'>
<target>
<size unit='KiB'>131072</size>
<node>0</node>
<block unit='KiB'>2048</block>
<requested unit='KiB'>131072</requested>
<address base="0x100000000"/>
</target>
</memory>

2. # virsh define vm1.xml
Domain 'vm1' defined from vm1.xml

Expected results

There should be error msg prompt to tell user address is conflicting

Actual results

Domain defined successfully

Additional info:

If defining 2 dimm devices with same address base, there is error msg:

virsh define vm1.xml
error: Failed to define domain from vm1.xml
error: unsupported configuration: memory device base '0x100000000' is already being used by another memory device