Re: [Xen-devel] VMX disabled by Feature Control MSR

[Jean-Pierre Dion <jean-pierre.dion@xxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
Sent: Wednesday, June 14, 2006 5:47 AM
To: Guillaume Thouvenin
Cc: LAURENT VIVIER; xen-devel@xxxxxxxxxxxxxxxxxxx; 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


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