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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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