linux-kernel - [PATCH 0/3] KVM: Yield to IPI target if necessary

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Message-Id: <1558953255-9432-1-git-send-email-wanpengli@tencent.com>
Date:   Mon, 27 May 2019 18:34:12 +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 0/3] KVM: Yield to IPI target if necessary

The idea is from Xen, when sending a call-function IPI-many to vCPUs, 
yield if any of the IPI target vCPUs was preempted. 17% performace 
increase of ebizzy benchmark can be observed in an over-subscribe 
environment. (w/ kvm-pv-tlb disabled, testing TLB flush call-function 
IPI-many since call-function is not easy to be trigged by userspace 
workload).

Wanpeng Li (3):
  KVM: X86: Implement PV sched yield in linux guest
  KVM: X86: Implement PV sched yield hypercall
  KVM: X86: Expose PV_SCHED_YIELD CPUID feature bit to guest

 Documentation/virtual/kvm/cpuid.txt      |  4 ++++
 Documentation/virtual/kvm/hypercalls.txt | 11 +++++++++++
 arch/x86/include/uapi/asm/kvm_para.h     |  1 +
 arch/x86/kernel/kvm.c                    | 21 +++++++++++++++++++++
 arch/x86/kvm/cpuid.c                     |  3 ++-
 arch/x86/kvm/x86.c                       | 17 +++++++++++++++++
 include/uapi/linux/kvm_para.h            |  1 +
 7 files changed, 57 insertions(+), 1 deletion(-)

-- 
2.7.4