DVD RW under KVM guest

[Radu Borsaru]

Hi,

(this is the third time I'm trying to post this thread; cc-ing virt-owner for help)

I'm using Fedora 14 with KVM/QEMU virtualization.
I have created a XP guest that is working fine.
However it cannot recognize the DVD-RW that I have available for the host. It can only
mount a read-only DVD (/dev/sr0).
If I open the details for the guest VM I cannot untick the read-only box that I can find
under the storage options (it is grayed out).
Is there any way I can mount this DVD as a rewritable media?

I was able to do this using Virtual Box and passthrough. I could not find anything about
this under KVM (only PCI passthrough that is not an valid option).

Regards,
RaduB

[Amit Shah]

On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
>  Hi,
>  
>  (this is the third time I'm trying to post this thread; cc-ing virt-owner for help)
Has made it to the list, stripping off that CC.

>  I'm using Fedora 14 with KVM/QEMU virtualization.
>  I have created a XP guest that is working fine.
>  However it cannot recognize the DVD-RW that I have available for the host. It can only
> mount a read-only DVD (/dev/sr0).
>  If I open the details for the guest VM I cannot untick the read-only box that I can find
> under the storage options (it is grayed out).
>  Is there any way I can mount this DVD as a rewritable media? 
Currently media is only exported as read-only to the guest.  RW is
possible, but there's no timeframe for it yet.

		Amit

[Kevin Wolf]

Am 03.05.2011 09:09, schrieb Amit Shah:
>  On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
> > Hi,
> >
> > (this is the third time I'm trying to post this thread; cc-ing virt-owner for
> help)
>  
>  Has made it to the list, stripping off that CC.
>  
> > I'm using Fedora 14 with KVM/QEMU virtualization.
> > I have created a XP guest that is working fine.
> > However it cannot recognize the DVD-RW that I have available for the host. It can
> only mount a read-only DVD (/dev/sr0).
> > If I open the details for the guest VM I cannot untick the read-only box that I can
> find under the storage options (it is grayed out).
> > Is there any way I can mount this DVD as a rewritable media?
>  
>  Currently media is only exported as read-only to the guest.  RW is
>  possible, but there's no timeframe for it yet. 
Shouldn't it be possible via scsi-generic? Not sure if libvirt provides
an interface for that, though.

Kevin

[Amit Shah]

On (Tue) 03 May 2011 [10:07:27], Kevin Wolf wrote:
>  Am 03.05.2011 09:09, schrieb Amit Shah:
>  > On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
>  >> Hi,
>  >>
>  >> (this is the third time I'm trying to post this thread; cc-ing virt-owner
> for help)
>  > 
>  > Has made it to the list, stripping off that CC.
>  > 
>  >> I'm using Fedora 14 with KVM/QEMU virtualization.
>  >> I have created a XP guest that is working fine.
>  >> However it cannot recognize the DVD-RW that I have available for the host. It
> can only mount a read-only DVD (/dev/sr0).
>  >> If I open the details for the guest VM I cannot untick the read-only box that I
> can find under the storage options (it is grayed out).
>  >> Is there any way I can mount this DVD as a rewritable media?
>  > 
>  > Currently media is only exported as read-only to the guest.  RW is
>  > possible, but there's no timeframe for it yet.
>  
>  Shouldn't it be possible via scsi-generic? Not sure if libvirt provides
>  an interface for that, though. 
You mean passthrough of host cdrom over the scsi layer?

		Amit

[Kevin Wolf]

Am 05.05.2011 14:28, schrieb Amit Shah:
>  On (Tue) 03 May 2011 [10:07:27], Kevin Wolf wrote:
> > Am 03.05.2011 09:09, schrieb Amit Shah:
> >> On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
> >>> Hi,
> >>>
> >>> (this is the third time I'm trying to post this thread; cc-ing virt-owner
> for help)
> >>
> >> Has made it to the list, stripping off that CC.
> >>
> >>> I'm using Fedora 14 with KVM/QEMU virtualization.
> >>> I have created a XP guest that is working fine.
> >>> However it cannot recognize the DVD-RW that I have available for the host. It
> can only mount a read-only DVD (/dev/sr0).
> >>> If I open the details for the guest VM I cannot untick the read-only box that
> I can find under the storage options (it is grayed out).
> >>> Is there any way I can mount this DVD as a rewritable media?
> >>
> >> Currently media is only exported as read-only to the guest.  RW is
> >> possible, but there's no timeframe for it yet.
> >
> > Shouldn't it be possible via scsi-generic? Not sure if libvirt provides
> > an interface for that, though.
>  
>  You mean passthrough of host cdrom over the scsi layer? 
Yes, SCSI passthrough is what I mean.

Kevin

[Amit Shah]

On (Thu) 05 May 2011 [14:32:56], Kevin Wolf wrote:
>  Am 05.05.2011 14:28, schrieb Amit Shah:
>  > On (Tue) 03 May 2011 [10:07:27], Kevin Wolf wrote:
>  >> Am 03.05.2011 09:09, schrieb Amit Shah:
>  >>> On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
>  >>>> Hi,
>  >>>>
>  >>>> (this is the third time I'm trying to post this thread; cc-ing
> virt-owner for help)
>  >>>
>  >>> Has made it to the list, stripping off that CC.
>  >>>
>  >>>> I'm using Fedora 14 with KVM/QEMU virtualization.
>  >>>> I have created a XP guest that is working fine.
>  >>>> However it cannot recognize the DVD-RW that I have available for the
> host. It can only mount a read-only DVD (/dev/sr0).
>  >>>> If I open the details for the guest VM I cannot untick the read-only box
> that I can find under the storage options (it is grayed out).
>  >>>> Is there any way I can mount this DVD as a rewritable media?
>  >>>
>  >>> Currently media is only exported as read-only to the guest.  RW is
>  >>> possible, but there's no timeframe for it yet.
>  >>
>  >> Shouldn't it be possible via scsi-generic? Not sure if libvirt provides
>  >> an interface for that, though.
>  > 
>  > You mean passthrough of host cdrom over the scsi layer?
>  
>  Yes, SCSI passthrough is what I mean. 
Might work - don't think anyone has tested that.  Do
libvirt/virt-manager support that?

		Amit

[Kevin Wolf]

Am 05.05.2011 14:38, schrieb Amit Shah:
>  On (Thu) 05 May 2011 [14:32:56], Kevin Wolf wrote:
> > Am 05.05.2011 14:28, schrieb Amit Shah:
> >> On (Tue) 03 May 2011 [10:07:27], Kevin Wolf wrote:
> >>> Am 03.05.2011 09:09, schrieb Amit Shah:
> >>>> On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
> >>>>> Hi,
> >>>>>
> >>>>> (this is the third time I'm trying to post this thread; cc-ing
> virt-owner for help)
> >>>>
> >>>> Has made it to the list, stripping off that CC.
> >>>>
> >>>>> I'm using Fedora 14 with KVM/QEMU virtualization.
> >>>>> I have created a XP guest that is working fine.
> >>>>> However it cannot recognize the DVD-RW that I have available for the
> host. It can only mount a read-only DVD (/dev/sr0).
> >>>>> If I open the details for the guest VM I cannot untick the read-only
> box that I can find under the storage options (it is grayed out).
> >>>>> Is there any way I can mount this DVD as a rewritable media?
> >>>>
> >>>> Currently media is only exported as read-only to the guest.  RW is
> >>>> possible, but there's no timeframe for it yet.
> >>>
> >>> Shouldn't it be possible via scsi-generic? Not sure if libvirt provides
> >>> an interface for that, though.
> >>
> >> You mean passthrough of host cdrom over the scsi layer?
> >
> > Yes, SCSI passthrough is what I mean.
>  
>  Might work - don't think anyone has tested that.  Do
>  libvirt/virt-manager support that? 
The qemu-devel mailing list archive suggests that this was Laurent
Vivier's test case for scsi-generic, so I think at some point it has
worked at least for one configuration.

If libvirt/virt-manager support it was exactly my question, so I can't
help with that.

Kevin

[Cole Robinson]

On 05/05/2011 08:45 AM, Kevin Wolf wrote:
>  Am 05.05.2011 14:38, schrieb Amit Shah:
> > On (Thu) 05 May 2011 [14:32:56], Kevin Wolf wrote:
> >> Am 05.05.2011 14:28, schrieb Amit Shah:
> >>> On (Tue) 03 May 2011 [10:07:27], Kevin Wolf wrote:
> >>>> Am 03.05.2011 09:09, schrieb Amit Shah:
> >>>>> On (Mon) 02 May 2011 [20:04:26], Radu Borsaru wrote:
> >>>>>> Hi,
> >>>>>>
> >>>>>> (this is the third time I'm trying to post this thread;
> cc-ing virt-owner for help)
> >>>>>
> >>>>> Has made it to the list, stripping off that CC.
> >>>>>
> >>>>>> I'm using Fedora 14 with KVM/QEMU virtualization.
> >>>>>> I have created a XP guest that is working fine.
> >>>>>> However it cannot recognize the DVD-RW that I have available for
> the host. It can only mount a read-only DVD (/dev/sr0).
> >>>>>> If I open the details for the guest VM I cannot untick the
> read-only box that I can find under the storage options (it is grayed out).
> >>>>>> Is there any way I can mount this DVD as a rewritable media?
> >>>>>
> >>>>> Currently media is only exported as read-only to the guest.  RW is
> >>>>> possible, but there's no timeframe for it yet.
> >>>>
> >>>> Shouldn't it be possible via scsi-generic? Not sure if libvirt
> provides
> >>>> an interface for that, though.
> >>>
> >>> You mean passthrough of host cdrom over the scsi layer?
> >>
> >> Yes, SCSI passthrough is what I mean.
> >
> > Might work - don't think anyone has tested that.  Do
> > libvirt/virt-manager support that?
>  
>  The qemu-devel mailing list archive suggests that this was Laurent
>  Vivier's test case for scsi-generic, so I think at some point it has
>  worked at least for one configuration.
>  
>  If libvirt/virt-manager support it was exactly my question, so I can't
>  help with that.
>   
Libvirt doesn't provide anyway to use scsi-generic AFAICT.

- Cole