KVM-Plugin: CD/DVD notvisible

TuXXer · 13. Juli 2022

Hi,

I tried to add a CD/DVD drive to one of my KVMs.

In the VM section I can add an optical drive (/dev/sr0) via VM -Optical - add host drive, but later on I cant see it in my VM. I tried it with several different Linux and I always get the same result.

Does somebody know how to overcome this problem?

ryecoaaron · 13. Juli 2022

Zitat von TuXXer

Does somebody know how to overcome this problem?

Having no info about the VM, did you try shutting it down? New hardware devices typically aren't recognized until you power cycle the VM.

TuXXer · 14. Juli 2022

I also did a restart! That is for sure not the reason why. I also tried 3 different CD/DVD drives and always removed the disc and always creaed a new optical (and removed the old one).

ryecoaaron · 14. Juli 2022

Zitat von TuXXer

I also did a restart!

I did say power cycle not restart but restart is probably enough.

Zitat von TuXXer

I also tried 3 different CD/DVD drives and always removed the disc and always creaed a new optical (and removed the old one).

I have no problem with it.

root@deb11:~# lsscsi

[0:0:0:0] cd/dvd QEMU QEMU DVD-ROM 2.5+ /dev/sr0

[1:0:0:0] cd/dvd QEMU QEMU DVD-ROM 2.5+ /dev/sr1

[2:0:0:0] cd/dvd QEMU QEMU DVD-ROM 2.5+ /dev/sr2

What is the output of: sudo lsscsi and post the VM's xml.

TuXXer · 14. Juli 2022

This is the output I got from lsscsi:

[4:0:0:0] cs/dvd PLEXTOR DVDR PX-L890SA 1.07 /dev/sr0

ryecoaaron · 14. Juli 2022

Zitat von TuXXer

This is the output I got from lsscsi:

Can you post the output of that from the guest? And what about the VM's xml?

TuXXer · 14. Juli 2022

On the VM I get the following feedback from lsscsi:

[0:0:0:0] cd/dvd QEMU DVD-ROM 2.5+ /dev/sr0

[1:0:0:0] cd/dvd QEMU DVD-ROM 2.5+ /dev/sr1

And this is the XML for the same VM:

Code

domain type='kvm' id='1'>
  <name>f36-2</name>
  <uuid>0e6e8c19-7794-4651-8279-de1d5db29950</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://libosinfo.org/linux/2020"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit='KiB'>8388608</memory>
  <currentMemory unit='KiB'>8388608</currentMemory>
  <vcpu placement='static'>4</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64' machine='pc-q35-7.0'>hvm</type>
    <loader type='rom'>/usr/share/OVMF/OVMF_CODE.fd</loader>
    <boot dev='hd'/>
    <boot dev='cdrom'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <vmport state='off'/>
  </features>
  <cpu mode='host-passthrough' check='none' migratable='on'>
    <topology sockets='1' dies='1' cores='4' threads='1'/>
  </cpu>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none' io='native'/>
      <source file='/srv/dev-disk-by-uuid-0146c27c-c57a-4e26-bacd-a2982d65a76a/KVM/pool/f36-2.qcow2' index='3'/>
      <backingStore/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/srv/dev-disk-by-uuid-0146c27c-c57a-4e26-bacd-a2982d65a76a/KVM/ISOS/Fedora-Workstation-Live-x86_64-36-1.5.iso' index='2'/>
      <backingStore/>
      <target dev='sda' bus='sata'/>
      <readonly/>
      <alias name='sata0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/sr0' index='1'/>
      <backingStore/>
      <target dev='sdb' bus='sata'/>
      <readonly/>
      <alias name='sata0-0-1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <alias name='usb'/>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x0' multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <alias name='usb'/>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <alias name='usb'/>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x2'/>
    </controller>
    <controller type='sata' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pcie-root'>
      <alias name='pcie.0'/>
    </controller>
    <controller type='pci' index='1' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='1' port='0x10'/>
      <alias name='pci.1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
    </controller>
    <controller type='pci' index='2' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='2' port='0x11'/>
      <alias name='pci.2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='3' port='0x12'/>
      <alias name='pci.3'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
    </controller>
    <controller type='pci' index='4' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='4' port='0x13'/>
      <alias name='pci.4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
    </controller>
    <controller type='pci' index='5' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='5' port='0x14'/>
      <alias name='pci.5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
    </controller>
    <controller type='pci' index='6' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='6' port='0x15'/>
      <alias name='pci.6'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x5'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
    </controller>
    <interface type='direct'>
      <mac address='52:54:00:10:4e:b6'/>
      <source network='b2' portid='2e8948fd-039d-486f-9852-3964a9f9b157' dev='enp35s0' mode='bridge'/>
      <target dev='macvtap0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <channel type='unix'>
      <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-1-f36-2/org.qemu.guest_agent.0'/>
      <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0' state='connected'/>
      <alias name='channel1'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
    <input type='tablet' bus='usb'>
      <alias name='input0'/>
      <address type='usb' bus='0' port='1'/>
    </input>
    <input type='mouse' bus='ps2'>
      <alias name='input1'/>
    </input>
    <input type='keyboard' bus='ps2'>
      <alias name='input2'/>
    </input>
    <graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <graphics type='spice' port='5901' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
      <image compression='off'/>
    </graphics>
    <sound model='ich9'>
      <alias name='sound0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1b' function='0x0'/>
    </sound>
    <audio id='1' type='spice'/>
    <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </video>
    <redirdev bus='usb' type='spicevmc'>
      <alias name='redir0'/>
      <address type='usb' bus='0' port='2'/>
    </redirdev>
    <redirdev bus='usb' type='spicevmc'>
      <alias name='redir1'/>
      <address type='usb' bus='0' port='3'/>
    </redirdev>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </memballoon>
    <rng model='virtio'>
      <backend model='random'>/dev/urandom</backend>
      <alias name='rng0'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </rng>
  </devices>
  <seclabel type='dynamic' model='dac' relabel='yes'>
    <label>+64055:+64055</label>
    <imagelabel>+64055:+64055</imagelabel>
  </seclabel>
</domain>

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I hope this helps to identify a solution for this problem!

ryecoaaron · 14. Juli 2022

Zitat von TuXXer

I hope this helps to identify a solution for this problem!

I still don't see the problem. The xml for the VM looks correct and the guest is reporting the two drives properly. What isn't working?

TuXXer · 15. Juli 2022

The DVD drive is not available/recognized in the VM!

ryecoaaron · 15. Juli 2022

Zitat von TuXXer

The DVD drive is not available/recognized in the VM!

lsscsi does not agree. Linux knows the drives are attached to the VM. What isn't the drive recognized by?

TuXXer · 15. Juli 2022

Meanwhile I found out the following:

* For one VM (Fedora 36) I can see the CD/DVD, but if I change the CD/DVD the system still shows the content of the first CD. It doesnt recognize that there was a change.

* For both VMs I have the situation that Audio CDs are not detected.

ryecoaaron · 15. Juli 2022

Zitat von TuXXer

For one VM (Fedora 36) I can see the CD/DVD, but if I change the CD/DVD the system still shows the content of the first CD. It doesnt recognize that there was a change.

There isn't much I can do about this from the plugin. It is adding the drive just like virt-manager does. Maybe you need to eject from guest OS or virsh from the host? I don't have a setup I can test this on right at the moment but not sure I could change anything anyway.

Zitat von TuXXer

For both VMs I have the situation that Audio CDs are not detected.

Are you passing the same drive to more than one VM? I understand the plugin lets you do this but I don't know if that works correctly.

KVM-Plugin: CD/DVD notvisible

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