Re: [PATCH] Activate Virtualization On Demand v2

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Nov 05, 2008 at 09:48:16AM +0100, Alexander Graf wrote:
> X86 CPUs need to have some magic happening to enable the virtualization
> extensions on them. This magic can result in unpleasant results for
> users, like blocking other VMMs from working (vmx) or using invalid TLB
> entries (svm).
> 
> Currently KVM activates virtualization when the respective kernel module
> is loaded. This blocks us from autoloading KVM modules without breaking
> other VMMs.
> 
> To circumvent this problem at least a bit, this patch introduces on
> demand activation of virtualization. This means, that instead
> virtualization is enabled on creation of the first virtual machine
> and disabled on removal of the last one.

Pardon my unfamiliarity with the code, but with this change applied,
will we still get an explicit error at time of loading kvm-intel.ko
if VMX were disabled in the BIOS ? Or will that error reporting be 
pushed off to time when VMX is first activated ?

Daniel
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