Hi Vitaly,
I am interested in patches since the 4.15 kernel that are
specific to nested Hyper-V and specific to non Hyper-V Windows guest.
Thanks,
Makarand.
On 12/3/21, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote:
> Makarand Sonare <makarandsonare@xxxxxxxxxx> 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@xxxxxxxxxx --oneline -i --grep
> 'enlightened.*vmcs' arch/x86/kvm/
>
> and
>
> $ git log --author vkuznets@xxxxxxxxxx --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
>
>
--
Thanks,
Makarand Sonare
