From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Xen HVM regression on certain Intel CPUs
Date: Thu, 28 Mar 2013 08:42:18 -0700
Message-ID: <515464DA.90405@zytor.com>
References: <CD79061A.1F6E4%keir.xen@gmail.com>
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To: Stefan Bader <stefan.bader@canonical.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>, wei.y.yang@intel.com, haitao.shan@intel.com, Keir Fraser <keir.xen@gmail.com>, xin.li@intel.com
List-Id: xen-devel@lists.xenproject.org

On 03/28/2013 08:06 AM, Stefan Bader wrote:
> 
> No you are completely right. The inverse boolean got me for good.
> So to summarize:
> 
> - smep=0 as hypervisor argument avoids the problem for all guests -
> nosmep as hvm guest arguement avoids the problem for that guest -
> /proc/cpuinfo correctly reflects whether smep has been masked off
> or not
> 

Please try to patch Jan pointed to.

	-hpa