Re: [Xen-devel] xen disk spec and emulation

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.03.19 at 14:54, <Paul.Durrant@xxxxxxxxxx> wrote:
>   Currently, when specifying a virtual disk, the only way to determine the 
> emulation model used is by selecting a particular 'vdev' numbering scheme as 
> detailed in xl-disk-configuration in the docs. That document refers the 
> reader to xen-vbd-interface which says:
> 
> xvd* -> xen virtual disk (from which one infers PV-only)
> hd* -> IDE emulation
> sd* -> SCSI emulation
> d*p* -> unknown emulation
> 
>   The first choice actually results in IDE emulation, which is not stated 
> anywhere AFAIK, and the fourth choice actually results in no emulation, 
> although that's not stated either. These two things can, of course, be fixed 
> in the documentation but I also think that the behaviour of vdev=xvd* is 
> surprising and wrong.

Wasn't this behavior intended to allow a guest to be installed
without PV drivers, but to have them enabled once they got
installed?

Jan



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