Re: KVM patches for Hyper-V improvements

[Vitaly Kuznetsov <vkuznets@redhat.com>]

Makarand Sonare <makarandsonare@google.com> writes:

> Hello Vitaly,
>                   I am interested in knowing the exact set of KVM
> patches that were added for the Nested Hyper-V scenario. Could you
> please point me to them?

Hi Makarand,

are you interested in patches since some upstream kernel version or
since the beginning of time? Thing is, some Hyper-V enlightenments
benefit both Windows and Hyper-V and some are specific to Hyper-V. Out
of top of my head, 'direct synthetic timers', 'Enlightened VMCS', and
'Enlightened MSR-Bitmap' features are Hyper-V specific. Patch list is
pretty long, see for example

$ git log --author vkuznets@redhat.com --oneline -i --grep 'enlightened.*vmcs' arch/x86/kvm/

and 

$ git log --author vkuznets@redhat.com --oneline -i --grep 'direct.*syn' arch/x86/kvm/

Enlightened MSR-Bitmap is only in kvm/master:
ceef7d10dfb6 KVM: x86: VMX: hyper-v: Enlightened MSR-Bitmap support

The list is likely incomplete as there are pre-requisites for these
patches which may not have the required keywords. There were fixes in
other parts of KVM for nested Hyper-V as well but I don't know an easy
way to find them (grepping for 'Hyper-V/hyperv' in the log would be a
good start but we'll certainly miss something).

Please let me know if that's what you're looking for and I'll try to
give you more precise information.

-- 
Vitaly