Re: [PATCH v2 2/4] x86/vmware: Add a header file for hypercall definitions

[Borislav Petkov]

On Fri, Aug 23, 2019 at 10:13:14AM +0200, Thomas HellstrÃm (VMware) wrote:
> From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> 
> The new header is intended to be used by drivers using the backdoor.
> Follow the kvm example using alternatives self-patching to
> choose between vmcall, vmmcall and io instructions.
> 
> Also define two new CPU feature flags to indicate hypervisor support
> for vmcall- and vmmcall instructions.

I could use some of the explanation why we need two feature flags added
here from:

https://lkml.kernel.org/r/970d2bb6-ab29-315f-f5d8-5d11095859af@xxxxxxxxxxxx

Thx.

-- 
Regards/Gruss,
    Boris.

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