linux-kernel - [PATCH 0/2] KVM: X86: Add dedicated pCPU hint and per-VM non-HLT-exiting capability

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Date:   Thu,  1 Feb 2018 23:11:11 -0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH 0/2] KVM: X86: Add dedicated pCPU hint and per-VM non-HLT-exiting capability

Waiman Long mentioned that:

 Generally speaking, unfair lock performs well for VMs with a small
 number of vCPUs. Native qspinlock may perform better than pvqspinlock
 if there is vCPU pinning and there is no vCPU over-commitment.

This patchset adds a PV_DEDICATED performance hint to allow hypervisor 
admin to choose the qspinlock to be used when a dedicated pCPU is 
available.

In addition, according to the original hlt in VMX non-root mode discussion, 
https://www.spinics.net/lists/kvm/msg152397.html This patchset also 
adds the per-VM non-HLT-exiting capability to further improve performance 
under the dedicated pCPU scenarios.

Wanpeng Li (2):
  KVM: X86: Add dedicated pCPU hint PV_DEDICATED
  KVM: X86: Add per-VM no-HLT-exiting capability

 Documentation/virtual/kvm/api.txt    | 11 +++++++++++
 Documentation/virtual/kvm/cpuid.txt  |  6 ++++++
 arch/x86/include/asm/kvm_host.h      |  2 ++
 arch/x86/include/uapi/asm/kvm_para.h |  1 +
 arch/x86/kernel/kvm.c                |  6 ++++++
 arch/x86/kvm/vmx.c                   | 21 +++++++++++++++++++++
 arch/x86/kvm/x86.c                   |  5 +++++
 arch/x86/kvm/x86.h                   |  5 +++++
 include/uapi/linux/kvm.h             |  1 +
 9 files changed, 58 insertions(+)

-- 
2.7.4