From: Tianyu Lan <>

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 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

Vitaly Kuznetsov (1):
  KVM/Hyper-V/VMX: Add direct tlb flush support

 Documentation/virtual/kvm/api.txt  | 12 ++++++++++++
 arch/x86/include/asm/hyperv-tlfs.h | 24 +++++++++++++++++++-----
 arch/x86/include/asm/kvm_host.h    |  2 ++
 arch/x86/kvm/vmx/evmcs.h           |  2 ++
 arch/x86/kvm/vmx/vmx.c             | 38 ++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/x86.c                 |  8 ++++++++
 include/linux/kvm_host.h           |  1 +
 include/uapi/linux/kvm.h           |  1 +
 8 files changed, 83 insertions(+), 5 deletions(-)


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