On Mon, 26 Feb 2018, Vitaly Kuznetsov wrote: For the non KVM pats of this series: Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > 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 > >
