linux-kernel - [PATCH V3 0/3] KVM/Hyper-V: Add Hyper-V direct tlb flush support

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Message-Id: <20190819131737.26942-1-Tianyu.Lan@microsoft.com>
Date:   Mon, 19 Aug 2019 21:17:34 +0800
From:   lantianyu1986@...il.com
To:     pbonzini@...hat.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: [PATCH V3 0/3] KVM/Hyper-V: Add Hyper-V direct tlb flush support

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 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 cap 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(-)

-- 
2.14.5