Re: [Qemu-devel] [PATCH RFC v1 2/2] hyper-v: initialize Hyper-V CPUID leafs.

[Avi Kivity]

On 10/17/2011 12:42 PM, Paolo Bonzini wrote:
> On 10/17/2011 12:41 PM, Avi Kivity wrote:
>> >  Even not counting that hyper-v support should IMHO not be in
>> >  KVM-specific code, I still think this shouldn't remove KVM leaves
>> >  completely but rather move them to 0x40000100.  The KVM
>> >  paravirtualization code then can similarly probe with 0x100 stride up
>> >  to 0x40001000.  This is what was done for Xen, and it allows to
>> enable
>> >  enlightenments independent of whether the guest is Linux or Windows.
>> >
>> >  However, let's get a third opinion---Avi, what do you think?
>>
>> I agree with you, especially as this already works for Xen.
>>
>> Note it doesn't completely solve the issue (so we have two interfaces,
>> which is the preferred one?), but it's better than nothing.
>
> Windows doesn't look beyond 0x40000000, so Hyper-V stays there and KVM
> has to shift.  So MS solved that part for us. :)

I mean, suppose Linux finds hyper-v at 000 and kvm at 100.  Is it kvm
impersonating hyper-v, or a future hyper-v impersonating kvm, or
something else (TAINT_CRAP?) impersonating both?

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