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Re: [libvirt] [PATCHv2 1/4] VMX: Add cdrom-raw dev type from VMWare Fusion



On Thu, Aug 22, 2013 at 08:53:06PM -0500, Doug Goldstein wrote:
> According to VMWare's documentation 'cdrom-raw' is an acceptable value
> for deviceType for a CD-ROM drive. The documentation states that the VMX
> configuration for a CD-ROM deviceType is as follows:
> 
> ide|scsi(n):(n).deviceType = "cdrom-raw|atapi-cdrom|cdrom-image"
> 
> >From the documentation it appears the following is true:
> - cdrom-image = Provides the ISO to the VM
> - atapi-cdrom = Provides a NEC emulated ATAPI CD-ROM on top of the host
>   CD-ROM
> - cdrom-raw = Passthru for a host CD-ROM drive. Allows CD-R burning from
>   within the guest.
> 
> A CD-ROM prior to this patch would always provide an 'atapi-cdrom' is
> modeled as:
>   <disk type='block' device='cdrom'>
>     <source dev='/dev/scd0'/>
>     <target dev='hda' bus='ide'/>
>     <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>   </disk>
> 
> This patch allows an optional element as:
>     <driver name='atapi'/>
> that would maintain existing behavior. While:
>     <driver name='raw'/>
> would provide a 'cdrom-raw' to the VM.


The 'cdrom-raw' case sounds very similar to the scenario we addressed
in QEMU, by adding support for a 'lun' value in the device attribute.

eg I think 'cdrom-raw' could be addressed by supporting

   <disk type='block' device='lun'>
     <source dev='/dev/scd0'/>
     <target dev='hda' bus='ide'/>
     <address type='drive' controller='0' bus='0' target='0' unit='0'/>
   </disk>

rather than using <driver>

Paolo, you added the 'lun' support - do you agree with this ?

Daniel
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