lkml.org 
[lkml]   [2018]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v3 0/7] Enlightened VMCS support for KVM on Hyper-V
Date
Changes since v2:
- Move hyperv.h out of uapi [Radim Krčmář], PATCHes 1 and 2 added.
- define KVM_EVMCS_VERSION, HV_X64_ENLIGHTENED_VMCS_VERSION [Radim Krčmář]
- WARN_ONCE in get_evmcs_offset[,_cf] [Radim Krčmář]
- add evmcs_sanitize_exec_ctrls() and use it in hardware_setup() and
dump_vmcs() [Radim Krčmář]

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

Ladi Prosek (1):
x86/kvm: rename HV_X64_MSR_APIC_ASSIST_PAGE to
HV_X64_MSR_VP_ASSIST_PAGE

Vitaly Kuznetsov (6):
x86/hyper-v: move hyperv.h out of uapi
x86/hyper-v: move definitions from TLFS to hyperv-tlfs.h
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

MAINTAINERS | 2 +-
arch/x86/hyperv/hv_init.c | 35 +-
arch/x86/include/asm/hyperv-tlfs.h | 695 +++++++++++++++++++++++++++++++++++
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/include/asm/mshyperv.h | 91 +----
arch/x86/include/uapi/asm/hyperv.h | 421 ---------------------
arch/x86/include/uapi/asm/kvm_para.h | 1 -
arch/x86/kernel/cpu/mshyperv.c | 21 +-
arch/x86/kvm/hyperv.c | 8 +-
arch/x86/kvm/lapic.h | 2 +-
arch/x86/kvm/vmx.c | 625 ++++++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 2 +-
drivers/hv/connection.c | 1 -
drivers/hv/hv.c | 1 -
drivers/hv/hyperv_vmbus.h | 1 +
drivers/hv/vmbus_drv.c | 1 -
include/linux/hyperv.h | 1 -
17 files changed, 1379 insertions(+), 530 deletions(-)
create mode 100644 arch/x86/include/asm/hyperv-tlfs.h
delete mode 100644 arch/x86/include/uapi/asm/hyperv.h

--
2.14.3

\
 
 \ /
  Last update: 2018-03-09 15:03    [W:0.244 / U:3.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site