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

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Message-ID: <20180328202338.GH26753@flask>
Date:   Wed, 28 Mar 2018 22:23:38 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, 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

2018-03-26 14:42+0200, Vitaly Kuznetsov:
> 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)?

Not from me;  I've queued it, thanks.