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Message-Id: <20180226171121.18974-1-vkuznets@redhat.com>
Date: Mon, 26 Feb 2018 18:11:16 +0100
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: kvm@...r.kernel.org
Cc: x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
"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
Subject: [PATCH v2 0/5] Enlightened VMCS support for KVM on Hyper-V
Changes since v1:
- The only comment I got for v1 was from kbuild test robot. The issue
was addressed by moving HV_X64_ENLIGHTENED_VMCS_RECOMMENDED definition
to PATCH2.
- Rebased to current kvm/queue.
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 (current kvm/queue on
E5-2667 v4 @ 3.20GHz):
Before: 20766 cycles
After: 8912 cycles
The series is based on current kvm/queue tree.
Ladi Prosek (1):
x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to
HV_X64_MSR_VP_ASSIST_PAGE
Vitaly Kuznetsov (4):
x86/hyper-v: allocate and use Virtual Processor Assist Pages
x86/hyper-v: define struct hv_enlightened_vmcs and clean field bits
x86/hyper-v: detect nested features
x86/kvm: use Enlightened VMCS when running on Hyper-V
arch/x86/hyperv/hv_init.c | 33 +++
arch/x86/include/asm/mshyperv.h | 12 +
arch/x86/include/uapi/asm/hyperv.h | 223 ++++++++++++++-
arch/x86/kernel/cpu/mshyperv.c | 3 +
arch/x86/kvm/hyperv.c | 8 +-
arch/x86/kvm/lapic.h | 2 +-
arch/x86/kvm/vmx.c | 561 ++++++++++++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 2 +-
8 files changed, 825 insertions(+), 19 deletions(-)
--
2.14.3
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