Re: [Xen-users] GPL PV drivers and CDROM

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

On 06/25/2009 11:40 AM, James Harper wrote:
> > I tried a new domU with gpl pv 0.10.0.69 on xen 3.2.1 and the cdrom is
> > not showing up anymore.
> > I see a xen block device driver corresponding to the vbd but no cdrom.
> >
> > Are the 0.10.x drivers compatible with some "old" xen ?
> >
> >      
> It should work, but not if there is no CDROM in the drive at the time
> (I'm assuming you are using the same config as posted in your previous
> email where you have a physical CDROM drive mapped through).
>
>    
I have a CDROM in my cd-drive, I tried also with an iso file (gparted 
iso) and got the same problem.
Booting with /nogplpv show me the cdrom, and during the "xen bios" I saw 
signs that indicate the presence of the CDROM.
> The PV block device back end (in Dom0) has no facility for swapping
> images on the fly, so there is nothing I can do about it in GPLPV.
Yes I know the problem and managed to cope with it with "older" version 
of gplpv.
>   On
> Xen 3.4.x and later, GPLPV has the ability to not provide a PV driver
> for the CDROM (it's hardly a performance critical device) and so windows
> will use the QEMU IDE driver which does support hot changing etc. This
> relies on some additional features not present before 3.4.x.
>
>    
Read about it  but I do not have official packages for this version on 
debian.
Matthieu.


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