I am using over two days access my dvd-writer to be recognized so I can use it to burn audio CDs. It is infuriating how we do not have a proper write up to address this issue. 

lsscsi returns the following for my dvd drive;

[2:0:0:0]    cd/dvd  HL-DT-ST DVDRAM GH24LS70  GL01  /dev/sr0

And here is the relevant section of my xml file-

  <devices>
    <emulator>/usr/local/sbin/qemu</emulator>
    <disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/iso/xubuntu-24.10-desktop-amd64.iso'/>
      <target dev='hda' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='writeback' discard='ignore'/>
      <source file='/mnt/cache/vms/vm-discks/vdisk1.img'/>
      <target dev='hdc' bus='sata' rotation_rate='1'/>
      <serial>vdisk1</serial>
      <address type='drive' controller='0' bus='0' target='0' unit='2'/>
    </disk>
    <controller type='scsi' index='0' model='virtio-scsi'>
    <!-- Host Device Passthrough (Physical SATA DVD-ROM) -->
    <hostdev mode='subsystem' type='scsi' bus='0x02' target='0x00' lun='0x00'>
      <address type='pci' bus='0x00' domain='0x0000' slot='0x04' function='0x0'/>
    </hostdev>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='sata' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </controller>

 Adding this edit, I can not save the xml file using virsh; error code is -

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

 

If I add the extra entry into XML ahead of the <device> section, i receive a different validation error.

What am I doing wrong?

 

No one is interested in this problem?

I am attempting the same thing so I am interested too.

You can try the following:

 

First add a virtual SCSI  contoller to your config:

<controller type='scsi' index='0' model='virtio-scsi'>
   <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
</controller>

If slot 0x09 is already used in your config for another device change it to something else

 

Then add the passthrough for the drive

<hostdev mode='subsystem' type='scsi' managed='no'>
   <source>
      <adapter name='scsi_host2'/>
      <address bus='0' target='0' unit='0'/>
   </source>
   <alias name='hostdev0'/>
   <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</hostdev>

scsi_host2 -> the number of the drive in your system -> in your case scsi_host2 since you have [2:0:0:0]

 

Both of these need to be in the devices-section.

Edited March 5, 20251 yr by Starfiresg1