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Re: [Xen-devel] Re: 2.6.37 PV on HVM issues

To: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: 2.6.37 PV on HVM issues
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 10 Jan 2011 14:27:42 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Christian Tramnitz <chris.ace@xxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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References: <4458732F49B59093800C3E56@xxxxxxxxxxxxx> <alpine.DEB.2.00.1012021536210.14723@kaball-desktop> <5ED004EC37ADBBFB70F4FDEE@xxxxxxxxxxxxx> <alpine.DEB.2.00.1012021737300.14723@kaball-desktop> <50F2A5B120DF725B46294E8E@xxxxxxxxxxxxx> <alpine.DEB.2.00.1012031058340.14723@kaball-desktop> <1291375483.5514.15376.camel@xxxxxxxxxxxxxxxxxxxxxx> <C44002062F681A87F54C4B34@xxxxxxxxxxxxx> <alpine.DEB.2.00.1012031720230.14723@kaball-desktop> <325F69BBAAFC8CC362477B43@xxxxxxxxxxxxx> <977838FB997873BF19948E15@xxxxxxxxxxxxx> <alpine.DEB.2.00.1012031748130.14723@kaball-desktop> <77A2D23CEB181E1A3DF46B52@xxxxxxxxxxxxx> <4D2A03DA.2080603@xxxxxxx> <alpine.DEB.2.00.1101101155280.2390@kaball-desktop> <1294667007.3831.4481.camel@xxxxxxxxxxxxxxxxxxxxxx>
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User-agent: Alpine 2.00 (DEB 1167 2008-08-23)
On Mon, 10 Jan 2011, Ian Campbell wrote:
> On Mon, 2011-01-10 at 12:10 +0000, Stefano Stabellini wrote:
> > It looks like another block driver has already registered the same major
> > number 202 but unfortunately the error message in register_blkdev
> > doesn't tell you who is it.
> If you can get to a command prompt somehow (even the rescue shell in the
> initrd) then /proc/devices will tell you who has registered it.

I looked into this issue and it turns out that the problem is completely
different from what I originally guessed.
I think Ubuntu builds platform-pci as a module by default and
mkinitramfs doesn't include it in the initrd but it is required by
blkfront and netfront.

Could you please rebuild your initramfs making sure that platform-pci is
included (add platform-pci to /etc/initramfs-tools/modules) and try

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