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Re: [Xen-devel] Xen 4.0.0-rc5 with xen/stable 2.6.32.9 dom0 kernel, blkt

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Xen 4.0.0-rc5 with xen/stable 2.6.32.9 dom0 kernel, blktap2, relative mouse
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 04 Mar 2010 10:22:20 -0800
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On 03/04/2010 07:51 AM, Pasi Kärkkäinen wrote:
On Thu, Mar 04, 2010 at 05:44:21PM +0200, Pasi Kärkkäinen wrote:
Hello,

I just tried running Xen 4.0.0-rc5 (64bit) with latest xen/stable 2.6.32.9 dom0 
kernel (64bit aswell).
System boots up fine, and I'm able to run PV guests using phy: disk backend 
(lvm volumes).

I tried using tap:aio: file-based storage with virt-manager for a PV guest.
It seems it doesn't really work, the guest waits for a long time
initializing disk drivers/devices, and then complains about not having any 
disks.

$ xm list -l testfoo
..
     (device
         (tap
             (protocol x86_64-abi)
             (uuid f7723325-9ff4-96f7-0808-9ec05a00a4b8)
             (bootable 1)
             (dev xvda:disk)
             (uname tap:aio:/var/lib/libvirt/images/testfoo.img)
             (mode w)
             (backend 0)
             (VDI )
         )
     )

Am I supposed to have that 'uname' there? This could be a problem with 
virt-manager or libvirt,
so I'll try with plain normal /etc/xen/ cfgfiles next..

Hmm, it seems phy: based guest has that 'uname' aswell:

     (device
         (vbd
             (protocol x86_64-abi)
             (uuid b7c115d7-138a-5cd0-a179-3038ba49d349)
             (bootable 1)
             (devid 51712)
             (driver paravirtualised)
             (dev xvda:disk)
             (uname phy:/dev/vg_f12test/f12test)
             (mode w)
             (backend 0)
         )
     )

So I guess that's all fine.

What's the best way to troubleshoot the blktap2 problem?

I have 'blktap' module loaded in dom0, and xen 4.0.0-rc5
should have the required blktap2 tools..

I haven't had any problems with blktap2 at all lately, using the xend/xm toolstack. Are there any messages in the various logfiles and/or kernel which might indicate a problem?

    J

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