From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wanpeng Li Subject: [PATCH v3 0/3] KVM: Introduce dedicated vCPUs hint KVM_HINTS_DEDICATED Date: Sun, 11 Feb 2018 11:29:43 +0800 Message-ID: <1518319786-1466-1-git-send-email-wanpengli@tencent.com> Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org This patchset introduces dedicated vCPUs hint KVM_HINTS_DEDICATED, it has two users now: 1) 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. 2) vCPUs are very unlikely to get preempted when they are the only task running on a CPU. PV TLB flush is slower that the native flush in that case. v2 -> v3: * a separate table for CPUID[0x40000001].EDX bits * a new kvm_hint_has_feature macro v1 -> v2: * update to KVM_HINTS_DEDICATED Wanpeng Li (3): KVM: Introduce dedicated vCPUs hint KVM_HINTS_DEDICATED KVM: X86: Choose qspinlock when dedicated vCPUs available KVM: X86: Don't use PV TLB flush with dedicated vCPUs and steal time disabled Documentation/virtual/kvm/cpuid.txt | 12 +++++++++++- arch/mips/include/asm/kvm_para.h | 5 +++++ arch/powerpc/include/asm/kvm_para.h | 5 +++++ arch/s390/include/asm/kvm_para.h | 5 +++++ arch/x86/include/asm/kvm_para.h | 6 ++++++ arch/x86/include/uapi/asm/kvm_para.h | 8 ++++++-- arch/x86/kernel/kvm.c | 18 ++++++++++++++++-- include/asm-generic/kvm_para.h | 5 +++++ include/linux/kvm_para.h | 5 +++++ 9 files changed, 64 insertions(+), 5 deletions(-) -- 2.7.4