From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: Re: Xen 4.2.0 won't boot with FC17 dom0 on Dell
 Optiplex 790, boots fine with 4.1.3
Date: Thu, 30 Aug 2012 10:04:42 -0700 (PDT)
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> From: bing [mailto:Libing.Chen@uts.edu.au]
> Sent: Thursday, August 30, 2012 12:16 AM
> To: xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] Xen 4.2.0 won't boot with FC17 dom0 on Dell Optiplex 790, boots fine with
> 4.1.3
> 
> I have a similar crash on Xen 4.2.0-rc3 with HP DC7900, reboot right
> after loading Dom0 kernel. I found a workaround by pass xsave=0 option
> to the xen kernel. It seems to be CPU related, same setup (same xen,
> Dom0 kernel version) works fine on another Dell Precision 3200.

Thanks, just saw this as I wasn't cc'ed on your email.  xsave=0
did solve my problem also.