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



On Tue, Aug 27, 2013 at 8:56 AM, Paolo Bonzini <pbonzini redhat com> wrote:
Il 27/08/2013 15:50, Daniel P. Berrange ha scritto:
> 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 ?

Yes, 100%.

- cdrom-image is type='file' device='cdrom'
- atapi-cdrom is type='block' device='cdrom'
- cdrom-raw is type='block' device='lun'

Paolo


Thanks guys. I'll respin it to device='lun'.

--
Doug Goldstein

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