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Re: [libvirt] Mounting a raw DVD



On 2009-11-09, at 11:46 PM, Gerry Reno wrote:

Adam Mooz wrote:
Hello List,

I'm attempting to pass a DVD drive of a headless server into a virtual machine.  So far I've managed to mount *something* into the VM, but it's being registered as a blank DVD within the VM. When I mount /dev/dvd into the bare-metal machine it registers normally as the DVD.  How do I pass physical drives into a VM and back out using libvirt?  
Command used:
#virsh attach-disk Montreal /dev/dvd hdc --mode readonly --driver phy --type cdrom
Connecting to uri: qemu:///system
Disk attached successfully

VM XML file:

<domain type='kvm'>
 <name>Montreal</name>
 <uuid>0f79ba7f-27bf-16a0-5887-6cfa2b5569f1</uuid>
 <memory>2097152</memory>
 <currentMemory>2097152</currentMemory>
 <vcpu>1</vcpu>
 <os>
   <type arch='x86_64' machine='pc-0.11'>hvm</type>
   <boot dev='hd'/>
 </os>
 <features>
   <acpi/>
   <apic/>
   <pae/>
 </features>
 <clock offset='utc'/>
 <on_poweroff>destroy</on_poweroff>
 <on_reboot>restart</on_reboot>
 <on_crash>restart</on_crash>
 <devices>
   <emulator>/usr/bin/kvm</emulator>
   <disk type='file' device='cdrom'>
     <target dev='hdc' bus='ide'/>
     <readonly/>
   </disk>
   <disk type='file' device='disk'>
     <source file='(Mangled Purposely)'/>
     <target dev='vda' bus='virtio'/>
   </disk>
   <interface type='bridge'>
     <mac address='(mangled purposly)/>       <source bridge='br0'/>
     <model type='virtio'/>
   </interface>
   <serial type='pty'>
     <target port='0'/>
   </serial>
   <console type='pty'>
     <target port='0'/>
   </console>
   <input type='mouse' bus='ps2'/>
   <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
   <video>
     <model type='cirrus' vram='9216' heads='1'/>
   </video>
 </devices>
</domain>


I haven't done this for a while but I believe you have to issue a 'detach' command afterwards.

-Gerry

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# virsh detach-disk Montreal hdc
Connecting to uri: qemu:///system
error: this function is not supported by the hypervisor: only SCSI or virtio disk device can be detached dynamically

? Also, I'm not sure if you understood my question.  When I pass in the DVD device into the VM it registers as a blank DVD.  if I pass in a non-existant folder it blows up, so I know it's reading something from the real DVD drive.  Mounting the real DVD drive in the bare-metal machine shows the files on the drive, but I cannot get them to appear in the VM.  How do I get the same files to show up in the VM (i.e. mount the DVD drive into the VM)?

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