From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Lalancette Subject: Re: 2.6.28 64-bit domU not booting Date: Fri, 27 Mar 2009 11:37:54 +0100 Message-ID: <49CCAC82.2010204@redhat.com> References: <4961FABF.1020304@dataproof.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4961FABF.1020304@dataproof.fi> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Valtteri Kiviniemi Cc: jeremy@goop.org, xen-devel@lists.xensource.com, Ian Campbell List-Id: xen-devel@lists.xenproject.org Valtteri Kiviniemi wrote: > Hi, > > Im using vanilla 2.6.28 kernel from kernel.org and when I try to boot my > domU with it, it just disappears without any error or warning. Just to dig up this old thread: we've been seeing the same thing. I *think* it comes down to the NX bit (or the lack thereof); on machines without NX, the early pagetable setup is trying to use the NX bit in the PTE flags, and the hypervisor is telling it to go away. The Red Hat bugzilla entry that I've filed has more analysis: https://bugzilla.redhat.com/show_bug.cgi?id=492523 Valtteri, can you give the output of "cat /proc/cpuinfo | grep flags", so we can confirm that it's probably the same issue? And it looks like Ian Campbell actually posted a patch upstream (http://lkml.indiana.edu/hypermail/linux/kernel/0901.3/02668.html) that should fix this, but I don't see it in any of the upstream trees. Ian, Jeremy, do you guys know what the status is there? It would be good to get into 2.6.30, and probably backport to the stable trees as well. -- Chris Lalancette