From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Pierre Dion Subject: Re: VMX disabled by Feature Control MSR Date: Thu, 15 Jun 2006 11:11:31 +0200 Message-ID: <44912443.4070802@bull.net> References: <5461330FA59EDB46BE9AB8AAF2C431AD38AB5B@scsmsx412.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0077045242==" Return-path: In-Reply-To: <5461330FA59EDB46BE9AB8AAF2C431AD38AB5B@scsmsx412.amr.corp.intel.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Mime-version: 1.0 Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Kamble, Nitin A" Cc: LAURENT VIVIER , Guillaume Thouvenin , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org This is a multi-part message in MIME format. --===============0077045242== Content-Type: multipart/alternative; boundary="------------030609050506010203010508" This is a multi-part message in MIME format. --------------030609050506010203010508 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii; format=flowed ok we will try get the right bios for our platform. thanks jean-pierre Kamble, Nitin A wrote: >Yes, Keir is correct. Once it is locked you can not unlock it by just >clearing the bit. Probably what you need is, enabling of VMX feature in >the BIOS, and then hard reset the system. > >Thanks & Regards, >Nitin >------------------------------------------------------------------------ >----------- >Open Source Technology Center, Intel Corp > > > >>-----Original Message----- >>From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel- >>bounces@lists.xensource.com] On Behalf Of Keir Fraser >>Sent: Wednesday, June 14, 2006 5:47 AM >>To: Guillaume Thouvenin >>Cc: LAURENT VIVIER; xen-devel@lists.xensource.com; JEAN-PIERRE DION >>Subject: Re: [Xen-devel] VMX disabled by Feature Control MSR >> >> >>On 14 Jun 2006, at 13:35, Guillaume Thouvenin wrote: >> >> >> >>>If the "VMX disabled..." message is displayed, it means that the lock >>>bit is set to 1. Otherwise we set bit2 to 1. If I try to clear it >>> >>> >while > > >>>it is set it causes a general-protection fault. Is it possible to >>>modify >>>before Xen switches from real mode to protected mode? >>> >>>I will try to modify the arch/x86/boot/x86_64.S >>> >>> >>No, it's called a lock bit because it is sticky once set. The intention >>is presumably to allow OEMs an easy way (in their BIOS) to disable VMX >>on their systems if they don't want to have to support it. >> >> -- Keir >> >> >>_______________________________________________ >>Xen-devel mailing list >>Xen-devel@lists.xensource.com >>http://lists.xensource.com/xen-devel >> > > > > -- Jean-Pierre DION Linux and Gnome projects manager Bull, Architect of an Open World TM Tel : +33 (0)4 76 29 72 34 http://www.bull.com http://www.bullopensource.org http://gnome.bullfreeware.com/new_index.html --------------030609050506010203010508 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii ok we will try get the right bios
for our platform.

thanks

jean-pierre

Kamble, Nitin A wrote:

Yes, Keir is correct. Once it is locked you can not unlock it by just
clearing the bit. Probably what you need is, enabling of VMX feature in
the BIOS, and then hard reset the system.

Thanks & Regards,
Nitin
------------------------------------------------------------------------
-----------
Open Source Technology Center, Intel Corp

-----Original Message-----
From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-
bounces@lists.xensource.com] On Behalf Of Keir Fraser
Sent: Wednesday, June 14, 2006 5:47 AM
To: Guillaume Thouvenin
Cc: LAURENT VIVIER; xen-devel@lists.xensource.com; JEAN-PIERRE DION
Subject: Re: [Xen-devel] VMX disabled by Feature Control MSR


On 14 Jun 2006, at 13:35, Guillaume Thouvenin wrote:

If the "VMX disabled..." message is displayed, it means that the lock
bit is set to 1. Otherwise we set bit2 to 1. If I try to clear it

while

it is set it causes a general-protection fault. Is it possible to
modify
before Xen switches from real mode to protected mode?

I will try to modify the arch/x86/boot/x86_64.S

No, it's called a lock bit because it is sticky once set. The intention
is presumably to allow OEMs an easy way (in their BIOS) to disable VMX
on their systems if they don't want to have to support it.

 -- Keir


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

-- 
Jean-Pierre DION
Linux and Gnome projects manager
Bull, Architect of an Open World TM 
Tel : +33 (0)4 76 29 72 34
http://www.bull.com
http://www.bullopensource.org
http://gnome.bullfreeware.com/new_index.html

--------------030609050506010203010508-- --===============0077045242== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel --===============0077045242==--