Re: [PATCH] KVM: nVMX: Don't expose TSC scaling to L1 when on Hyper-V

[Vitaly Kuznetsov]

 Anirudh Rayabharam <anrayabh@xxxxxxxxxxxxxxxxxxx> writes:

...

>
> As per the comments in arch/x86/kvm/vmx/evmcs.h, TSC multiplier field is
> currently not supported in EVMCS.

The latest version:
https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/datatypes/hv_vmx_enlightened_vmcs

has it, actually. It was missing before (compare with e.g. 6.0b version
here:
https://github.com/MicrosoftDocs/Virtualization-Documentation/raw/live/tlfs/Hypervisor%20Top%20Level%20Functional%20Specification%20v6.0b.pdf)

but AFAIR TSC scaling wasn't advertised by genuine Hyper-V either.
Interestingly enough, eVMCS version didn't change when these fields were
added, it is still '1'.

I even have a patch in my stash (attached). I didn't send it out because
it wasn't properly tested with different Hyper-V versions.

-- 
Vitaly