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SubjectRE: [PATCH V3 0/4] KVM/x86/hyper-V: Introduce PV guest address space mapping flush support
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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
>
> Hyper-V provides a para-virtualization hypercall
> HvFlushGuestPhysicalAddressSpace
> to flush nested VM address space mapping in l1 hypervisor and it's to reduce
> 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.
>
> Change since v2:
> - Make ept_pointers_match as tristate "check", "match" and "mismatch".
> 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"
>
> 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_pointer.
> - Add hyperv_nested_flush_guest_mapping ftrace support
>
>
>
> 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
>
> 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>

>
> --
> 2.14.3

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