Re: [Xen-users] attach an iso file to a PV guest

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-07-31 at 17:51 +0200, Maarten Vanraes wrote:
> Op woensdag 31 juli 2013 16:41:47 schreef Ian Campbell:
> > On Wed, 2013-07-31 at 17:17 +0200, Maarten Vanraes wrote:
> > > Op woensdag 31 juli 2013 15:36:39 schreef Ian Campbell:
> > > > On Wed, 2013-07-31 at 16:20 +0200, Maarten Vanraes wrote:
> > > > > i'm using the xl tools and i want to attach an iso file to a PV.
> > > > 
> > > > Which version of Xen and what does your guest config file contain?
> > > > 
> > > > Please can you provide the result of attempting "xl -vvv create $cfg"
> > > > with
> > > > your $cfg
> > > 
> > > thanks to your suggestion to use -vvv i can now see more on what's going
> > > on...
> > > 
> > > this is xen 4.2.2 using the centos repository with kernel:
> > > 3.4.46-8.el6.centos.alt.x86_64
> > > 
> > > 
> > > what didn't work:
> > > [ ]# xl -vvv block-attach templ-sl6
> > > format=raw,vdev=hdb,access=ro,backendtype=tap,devtype=cdrom,target=/path/t
> > > o/SL-64.iso
> > > 
> > > output:
> > > -----------
> > > libxl: debug: libxl.c:3211:libxl_device_disk_add: ao 0x1a09a40: create:
> > > how=(nil) callback=(nil) poller=0x1a09aa0
> > > libxl: debug: libxl_device.c:245:libxl__device_disk_set_backend: Disk
> > > vdev=hdb spec.backend=tap
> > > DEBUG libxl__blktap_devpath 37 aio:/etc/xen/isos/ScientificLinux/SL-64-
> > > x86_64-2013-03-18-Install-DVD.iso
> > > libxl: error: libxl.c:1866:device_disk_add: failed to get blktap devpath
> > > for 0x1a09bf0
> > 
> > Weird. There were some oddities with cdrom and/or blktap in 4.2, which
> > may be improved in 4.3.
> > 
> > Can you try without the backendtype=tap bit (just say nothing). I hope
> > this will cause libxl to automatically pick something which actually
> > works.
> > 
> > Unless you know you have some specific requirement for blktap this is
> > good advice in general.
> 
> Well, it's because not specifying it, that i tried specifying it...
> 
> when i didn't specify it, there were 2 extra lines:
> 
> the first was: 
> "libxl: debug: libxl_device.c:245:libxl__device_disk_set_backend: Disk 
> vdev=hdb spec.backend=unknown"

backend=unknown at this stage is ok, I think. At some point there should
have been logging (with -vvv) about which bakcned to choose.

> but, this is really some oddity, i never thought that the contents of a file 
> was inspected before actually adding it to the guest...

It shouldn't be (I'm pretty sure it isn't in fact), I think there is
probably some other underlying issue.

Ian.



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