linux-kernel - Re: [PATCH v6 0/7] Enlightened VMCS support for KVM on Hyper-V

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Message-ID: <87muyv2ek9.fsf@vitty.brq.redhat.com>
Date:   Mon, 26 Mar 2018 14:42:46 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley \(EOSG\)" <Michael.H.Kelley@...rosoft.com>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>, Bandan Das <bsd@...hat.com>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v6 0/7] Enlightened VMCS support for KVM on Hyper-V

Vitaly Kuznetsov <vkuznets@...hat.com> writes:

> Changes since v5:
> - Fix a couple of issues reported by kbuild test robot, both in
>   PATCH7 (hope Radim's Reviewed-by: stands).
>
> When running nested KVM on Hyper-V it's possible to use so called
> 'Enlightened VMCS' and do normal memory reads/writes instead of
> doing VMWRITE/VMREAD instructions. In addition, clean field mask
> provides a huge room for optimization on L0's side.
>
> Tight CPUID loop test shows significant speedup (E5-2667 v4 @ 3.20GHz):
>   Before: 18890 cycles
>   After: 8304 cycles
>

Paolo, Radim,

with Thomas' ACK on the series:
https://www.spinics.net/lists/kvm/msg166309.html

is there anything else needed for it to get merged (hoping for 4.17)?

Thanks,

-- 
  Vitaly