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

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Subject: Re: [Xen-devel] Xen 4.0.0-rc5 with xen/stable dom0 kernel, blktap2, relative mouse
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Thu, 4 Mar 2010 17:51:54 +0200
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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 
> 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:

            (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..

-- Pasi

> Also it seems pvfb uses the broken 'relative' mouse instead of 'absolute', 
> any ideas why that happens? 
> -- Pasi

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