Re: [XenPPC] VIO Block and Xm-Test

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

On Oct 23, 2006, at 2:56 AM, Tony Breeds wrote:

> Hi all,
>         I'm slowly working my way through a default run on xm-test on my
> JS20 trying to determine if the tests that fail represent real  
> problems
> with xen on PPC, or if they're showing problems with the tests  
> themselves.
> By correcting some of the create/* tests (patches posted to xen-devel)
> XenPPC now passes that whole group.
>
> In looking at the block-* tests, I see that the failures are due to  
> the
> domU kernel including scsi support, which then causes a conflict on  
> major
> number 8, resulting in a lot of failures in xm-test.
hmm..
If I try to do this manually, I get:
  Registering block device major 8
  register_blkdev: cannot get major 8 for sd
  xen_blk: can't get major 8 with name sd
  vbd vbd-2065: 19 xlvbd_add at /local/domain/0/backend/vbd/1/2065

The problem is described in:
  http://wiki.xensource.com/xenwiki/XenFaq#head- 
baa7000e8fc28fd168650114dd2741b7f21da8fa
Where we are told:
  "all you need to do is disable the entire scsi subsystem"

GTFOOH! (said in my best soprano)
There has to be a better way!

[snip]

> I'd like to know how everyone feels about creating a "make  
> xen_domu_config"
> target which turns of the driver that aren't needed?
I think it is unacceptable.
Seriously, it is really important to XenPPC that the same kernel  
image work everywhere
> Or alternatively suggestions on how to keep a unified kernel image  
> that "works"?
One alternative is to use the ide devices
  $ xm block-attach 3 file:/root/disk2 hdb2 w
Works just fine, for disks.
There is also the "xvd" (Xen Virtual Block Device) which can be  
attached using xen major 20
  $  xm block-attach 6 file:/root/disk2 xvda w

Which translates into (202,0), which is lanana blessed:
  http://www.be.kernel.org/pub/linux/docs/lanana/device-list/ 
devices-2.6+.txt
I had to:
  mknod /dev/xvda b 202 0

to be able to mount it.

I do not know what the official/current Xen support for "xvd", but it  
is a good question, I'll ask.
-JX



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