Re: [PATCH V4 0/3] KVM/Hyper-V: Add Hyper-V direct tlb flush support

[Paolo Bonzini]

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.

Paolo