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From: Vitaly Kuznetsov <vkuznets@redhat.com>
References: <20180411115036.31832-1-vkuznets@redhat.com>
Date: Wed, 02 May 2018 09:34:19 +0200
In-Reply-To: <20180411115036.31832-1-vkuznets@redhat.com> (Vitaly Kuznetsov's
	message of "Wed, 11 Apr 2018 13:50:35 +0200")
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Subject: Re: [Qemu-devel] [PATCH v5 0/1] i386/kvm: TSC page clocksource for
 Hyper-V-on-KVM fixes
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To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <rth@twiddle.net>, Eduardo Habkost <ehabkost@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Roman Kagan <rkagan@virtuozzo.com>

Vitaly Kuznetsov <vkuznets@redhat.com> writes:

> Changes since v4:
> - Rebase on top of Roman's patches.
> - Drop PATCH2 as it is no longer needed (after adding explicit
>   hv_frequencies).
>
> Previously, Ladi was working on enabling TSC page clocksource for nested
> Hyper-V-on-KVM workloads. He found out that if Hyper-V frequency MSRs are
> exposed to L1 as well as INVTSC flag Hyper-V enables TSC page clocksource
> to its guests. Qemu doesn't pass INVTSC by default as it is a migration
> blocker.
>
> I found out there's a different way to make Hyper-V like us: expose
> Reenlightenment MSRs to it. KVM doesn't fully support the feature as
> we're still unable to migrate nested environments but rudimentary support
> we have there is enough.
>
> Enable Hyper-V reenlightenment MSRs to make things work.
>

Gentle ping :-)

With Roman's Reviewed-by:, is there anything else needed from me to get
this accepted?

Thanks!

-- 
  Vitaly