[edk2-devel] [PATCH v6 1/6] OvmfPkg/BaseMemEncryptLib: Detect SEV live migration feature.

[Lendacky, Thomas via groups.io]

On 8/10/21 1:05 AM, Gerd Hoffmann wrote:
>   Hi,
> 
>>> I still really don't understand the need for the CPUID loop. KVM only ever
>>> programs CPUID function 0x40000000, right?
> 
> Nope.  When you enable hyper-v emulation features you'll go find the kvm
> cpuid @ 0x40000000 and the hyper-v cpuid @ 0x40000100 (or the other way
> around, not sure).

Ah, thanks. I just saw the comment above get_out_of_range_cpuid_entry() in
arch/x86/kvm/cpuid.c where HyperV would get the 0x40000000-0x400000ff
range and KVM would then get the 0x40000100-0x400001ff range (basically
each hypervisor class gets their own 0x100 range).

Thanks,
Tom

> 
> take care,
>   Gerd
> 


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