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

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Message-ID: <7ea7fa06-f100-1507-8507-1c701877c8ab@redhat.com>
Date:   Tue, 17 Sep 2019 15:27:44 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     lantianyu1986@...il.com, rkrcmar@...hat.com, corbet@....net,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, x86@...nel.org,
        michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, vkuznets@...hat.com
Subject: Re: [PATCH V4 0/3] KVM/Hyper-V: Add Hyper-V direct tlb flush support

On 22/08/19 16:30, lantianyu1986@...il.com wrote:
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> 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