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From:   KY Srinivasan <kys@microsoft.com>
To:     Tianyu Lan <Tianyu.Lan@microsoft.com>
CC:     "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        "hpa@zytor.com" <hpa@zytor.com>,
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        "x86@kernel.org" <x86@kernel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
        "vkuznets@redhat.com" <vkuznets@redhat.com>
Subject: RE: [PATCH V3 0/4] KVM/x86/hyper-V: Introduce PV guest address space
 mapping flush support
Thread-Topic: [PATCH V3 0/4] KVM/x86/hyper-V: Introduce PV guest address space
 mapping flush support
Thread-Index: AQHUHzwUffUmbGD3SUGBq0C4VrI5YKSXfQNA
Date:   Fri, 20 Jul 2018 03:58:43 +0000
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> -----Original Message-----
> From: Tianyu Lan
> Sent: Thursday, July 19, 2018 1:40 AM
> Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>; devel@linuxdriverproject.org;
> Haiyang Zhang <haiyangz@microsoft.com>; hpa@zytor.com;
> kvm@vger.kernel.org; KY Srinivasan <kys@microsoft.com>; linux-
> kernel@vger.kernel.org; mingo@redhat.com; pbonzini@redhat.com;
> rkrcmar@redhat.com; Stephen Hemminger <sthemmin@microsoft.com>;
> tglx@linutronix.de; x86@kernel.org; Michael Kelley (EOSG)
> <Michael.H.Kelley@microsoft.com>; vkuznets@redhat.com
> Subject: [PATCH V3 0/4] KVM/x86/hyper-V: Introduce PV guest address
> space mapping flush support
>=20
> Hyper-V provides a para-virtualization hypercall
> HvFlushGuestPhysicalAddressSpace
> to flush nested VM address space mapping in l1 hypervisor and it's to red=
uce
> overhead
> of flushing ept tlb among vcpus. The tradition way is to send IPIs to all
> affected
> vcpus and executes INVEPT on each vcpus. It will trigger several vmexits =
for
> IPI and
> INVEPT emulation. The pv hypercall can help to flush specified ept table =
on all
> vcpus
> via one single hypercall.
>=20
> Change since v2:
>        - Make ept_pointers_match as tristate "check", "match" and "mismat=
ch".
>        Set "check" in vmx_set_cr3(), check all ept table pointers in
> hv_remote_flush_tlb()
>        and call hypercall when all ept pointers are same.
>        - Rename kvm_arch_hv_flush_remote_tlb with
> kvm_arch_flush_remote_tlb and
>        Rename kvm_x86_ops->hv_tlb_remote_flush with kvm_x86_ops-
> >tlb_remote_flush
>        - Fix issue that ignore updating tlbs_dirty during calling
> kvm_arch_flush_remote_tlbs()
>        - Merge patch "KVM/VMX: Add identical ept table pointer check" and
>        patch "KVM/x86: Add tlb_remote_flush callback support for vmx"
>=20
> Change since v1:
>        - Fix compilation error for non-x86 platform.
>        - Use ept_pointers_match to check condition of identical ept
>             table pointer and get ept pointer from struct vcpu_vmx->ept_p=
ointer.
>        - Add hyperv_nested_flush_guest_mapping ftrace support
>=20
>=20
>=20
> Lan Tianyu (4):
>   X86/Hyper-V: Add flush HvFlushGuestPhysicalAddressSpace hypercall
>     support
>   X86/Hyper-V: Add hyperv_nested_flush_guest_mapping ftrace support
>   KVM: Add tlb remote flush callback in kvm_x86_ops.
>   KVM/x86: Add tlb_remote_flush callback support for vmx
>=20
>  arch/x86/hyperv/Makefile            |  2 +-
>  arch/x86/hyperv/nested.c            | 67
> ++++++++++++++++++++++++++++++++++
>  arch/x86/include/asm/hyperv-tlfs.h  |  8 +++++
>  arch/x86/include/asm/kvm_host.h     | 11 ++++++
>  arch/x86/include/asm/mshyperv.h     |  2 ++
>  arch/x86/include/asm/trace/hyperv.h | 14 ++++++++
>  arch/x86/kvm/vmx.c                  | 72
> ++++++++++++++++++++++++++++++++++++-
>  include/linux/kvm_host.h            |  7 ++++
>  virt/kvm/kvm_main.c                 |  3 +-
>  9 files changed, 183 insertions(+), 3 deletions(-)
>  create mode 100644 arch/x86/hyperv/nested.c

Acked-by: K. Y. Srinivasan <kys@microsoft.com>

>=20
> --
> 2.14.3