From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Re: Re: Xend cannot start
Date: Tue, 19 Apr 2011 09:32:40 -0400
Message-ID: <20110419133240.GB4060@dumpdata.com>
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On Tue, Apr 19, 2011 at 10:56:25AM +0800, ruozeng.w wrote:
> I got the 2.6.39-rc3 kernel full source from http://www.kernel.org.

The 2.6.39-rc3 does not have the blkback driver in. There is a version

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #master

that has that one.
> And CONFIG_PARAVIRT is turned on.

Ok, so that is there.
> 
> Here is the steps I configure the kernel:
> 1. Processor type and features
> High Memory Support--->
> 64GB
> (Then I can see PAE and some xen related options)

OK, so you have the right version of Dom0. What about the version of
Xen-unstable? Are you compiling it from scratch?