Paolo Bonzini <pbonzini@xxxxxxxxxx> writes: > On 22/08/19 16:30, lantianyu1986@xxxxxxxxx wrote: >> From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx> >> >> This patchset is to add Hyper-V direct tlb support in KVM. Hyper-V >> in L0 can delegate L1 hypervisor to handle tlb flush request from >> L2 guest when direct tlb flush is enabled in L1. >> >> Patch 2 introduces new cap KVM_CAP_HYPERV_DIRECT_TLBFLUSH to enable >> feature from user space. User space should enable this feature only >> when Hyper-V hypervisor capability is exposed to guest and KVM profile >> is hided. There is a parameter conflict between KVM and Hyper-V hypercall. >> We hope L2 guest doesn't use KVM hypercall when the feature is >> enabled. Detail please see comment of new API "KVM_CAP_HYPERV_DIRECT_TLBFLUSH" >> >> Change since v3: >> - Update changelog in each patches. >> >> Change since v2: >> - Move hv assist page(hv_pa_pg) from struct kvm to struct kvm_hv. >> >> Change since v1: >> - Fix offset issue in the patch 1. >> - Update description of KVM KVM_CAP_HYPERV_DIRECT_TLBFLUSH. >> >> Tianyu Lan (2): >> x86/Hyper-V: Fix definition of struct hv_vp_assist_page >> KVM/Hyper-V: Add new KVM capability KVM_CAP_HYPERV_DIRECT_TLBFLUSH >> >> Vitaly Kuznetsov (1): >> KVM/Hyper-V/VMX: Add direct tlb flush support >> >> Documentation/virtual/kvm/api.txt | 13 +++++++++++++ >> arch/x86/include/asm/hyperv-tlfs.h | 24 ++++++++++++++++++----- >> arch/x86/include/asm/kvm_host.h | 4 ++++ >> arch/x86/kvm/vmx/evmcs.h | 2 ++ >> arch/x86/kvm/vmx/vmx.c | 39 ++++++++++++++++++++++++++++++++++++++ >> arch/x86/kvm/x86.c | 8 ++++++++ >> include/uapi/linux/kvm.h | 1 + >> 7 files changed, 86 insertions(+), 5 deletions(-) >> > > Queued, thanks. > I had a suggestion how we can get away without the new capability (like direct tlb flush gets automatically enabled when Hyper-V hypercall page is activated and we know we can't handle KVM hypercalls any more) but this can probably be done as a follow-up. -- Vitaly
