Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

[Borislav Petkov]

On Tue, Jul 24, 2012 at 12:29:19PM +0400, Vladimir Davydov wrote:
> I guess that when the more advanced features become widely-used,
> vendors will offer new MSRs and/or CPUID faulting.

And this right there is the dealbreaker:

So what are you doing for cpus which have the advanced CPUID features
leafs but there are no MSRs to turn those bits off?

You surely need some software-only solution for the migration to work,
no?

If so, why not apply that solution to your hypervisor without touching
the kernel at all?

Thanks.

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