linux-kernel - [PATCH 0/4] x86/hyper-v: optimize PV IPIs

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Message-Id: <20180622170625.30688-1-vkuznets@redhat.com>
Date:   Fri, 22 Jun 2018 19:06:21 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     x86@...nel.org
Cc:     devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
Subject: [PATCH 0/4] x86/hyper-v: optimize PV IPIs

When reviewing my "x86/hyper-v: use cheaper HVCALL_FLUSH_VIRTUAL_ADDRESS_
{LIST,SPACE} hypercalls when possible" patch Michael suggested to apply the
same idea to PV IPIs. Here we go!

Despite what Hyper-V TLFS says about HVCALL_SEND_IPI hypercall, it can
actually be 'fast' (passing parameters through registers). Use that too.

This series can collide with my "KVM: x86: hyperv: PV IPI support for
Windows guests" series as I rename ipi_arg_non_ex/ipi_arg_ex structures
there. Depending on which one gets in first we may need to do tiny
adjustments.

Vitaly Kuznetsov (4):
  x86/hyper-v: implement hv_do_fast_hypercall16
  x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI
  x86/hyper-v: use cheaper HVCALL_SEND_IPI hypercall when possible
  x86/hyper-v: trace PV IPI send

 arch/x86/hyperv/hv_apic.c           | 57 ++++++++++++++++++++-----------------
 arch/x86/include/asm/mshyperv.h     | 34 ++++++++++++++++++++++
 arch/x86/include/asm/trace/hyperv.h | 15 ++++++++++
 3 files changed, 80 insertions(+), 26 deletions(-)

-- 
2.14.4