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

To: Christian Tramnitz <chris.ace@xxxxxxx>
Subject: Re: [Xen-devel] Re: 2.6.37 PV on HVM issues
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 10 Jan 2011 12:10:34 +0000
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On Sun, 9 Jan 2011, Christian Tramnitz wrote:
> Alex Bligh wrote:
> >
> > Bug filed:
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/684875
> >
> The bug has been marked as fixed and I can confirm that it now (using 
> 2.6.37-12-server) tries to create an xvd device (instead of sd) but I'm 
> still unable to boot Natty PV-on-HVM (as HVM domain with just xvd and 
> non-ioemu devices).
> According to dmesg everything is fine:
> DMI: /HVM domU, BIOS 4.0.1 09/28/2010
> Hypervisor detected: Xen HVM
> Xen version 4.0.
> Xen Platform PCI: I/O protocol version 1
> Netfront and the Xen platform PCI driver have been compiled for this 
> kernel: unplug emulated NICs.
> Blkfront and the Xen platform PCI driver have been compiled for this 
> kernel: unplug emulated disks.
> Booting paravirtualized kernel on Xen
> Xen HVM callback vector for event delivery is enabled
> But I cannot load xen-blkfront (manually creating the 202 device nodes 
> does not help either):
> register_blkdev: cannot get major 202 for xvd
> xen_blk: can't get major 202 with name xvd
> FATAL: Error inserting xen_blkfront 
> (/lib/modules/2.6.37-12-server/kernel/drivers/block/xen-blkfront.ko): No 
> such device
> Does anyone have a running Natty domU with PV-on-HVM?

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.

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