Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2011-10-27 at 14:13 +0100, Konrad Rzeszutek Wilk wrote:
> > > Are the PV devices meant to appear as /dev/sdX rather than /dev/xvdX?
> > 
> > No, there is no support for this in upstream kernels (in general all the
> > old behaviours of Xen kernels where they would hijack other drivers
> > device names are not upstreamble)
> 
> Wait a minute. I think these two:
> 
> konrad@phenom:~/work/linux$ git shortlog v3.0..v3.1 
> drivers/block/xen-blkfront.c
> Stefan Bader (2):
>       xen-blkfront: Drop name and minor adjustments for emulated scsi devices
>       xen-blkfront: Fix one off warning about name clash
> 
> 
> Made it happen.. as without them the Amazon EC2 would not boot?

No, that was to do with not renaming hda devices into xvdHDa (or
something like that) and instead calling them hda.

I was talking about blkfront literally taking over the IDE major which
is not something that's upstream.

> 
> Details: "    xen-blkfront: Drop name and minor adjustments for emulated scsi 
> devices
>     
>     These were intended to avoid the namespace clash when representing
>     emulated IDE and SCSI devices. However that seems to confuse users
>     more than expected (a disk defined as sda becomes xvde).
>     So for now go back to the scheme which does no adjustments. This
>     will break when mixing IDE and SCSI names in the configuration of
>     guests but should be by now expected"



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