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Subject[Resend PATCH V5 0/10] x86/KVM/Hyper-v: Add HV ept tlb range flush hypercall support in KVM
Date
From: Lan Tianyu <Tianyu.Lan@microsoft.com>

For nested memory virtualization, Hyper-v doesn't set write-protect
L1 hypervisor EPT page directory and page table node to track changes
while it relies on guest to tell it changes via HvFlushGuestAddressLlist
hypercall. HvFlushGuestAddressLlist hypercall provides a way to flush
EPT page table with ranges which are specified by L1 hypervisor.

If L1 hypervisor uses INVEPT or HvFlushGuestAddressSpace hypercall to
flush EPT tlb, Hyper-V will invalidate associated EPT shadow page table
and sync L1's EPT table when next EPT page fault is triggered.
HvFlushGuestAddressLlist hypercall helps to avoid such redundant EPT
page fault and synchronization of shadow page table.

This patchset is based on the Patch "KVM/VMX: Check ept_pointer before
flushing ept tlb"(https://marc.info/?l=kvm&m=154408169705686&w=2).

Change since v4:
1) Split flush address and flush list patches. This patchset only contains
flush address patches. Will post flush list patches later.
2) Expose function hyperv_fill_flush_guest_mapping_list()
out of hyperv file
3) Adjust parameter of hyperv_flush_guest_mapping_range()
4) Reorder patchset and move Hyper-V and VMX changes ahead.

Change since v3:
1) Remove code of updating "tlbs_dirty" in kvm_flush_remote_tlbs_with_range()
2) Remove directly tlb flush in the kvm_handle_hva_range()
3) Move tlb flush in kvm_set_pte_rmapp() to kvm_mmu_notifier_change_pte()
4) Combine Vitaly's "don't pass EPT configuration info to
vmx_hv_remote_flush_tlb()" fix

Change since v2:
1) Fix comment in the kvm_flush_remote_tlbs_with_range()
2) Move HV_MAX_FLUSH_PAGES and HV_MAX_FLUSH_REP_COUNT to
hyperv-tlfs.h.
3) Calculate HV_MAX_FLUSH_REP_COUNT in the macro definition
4) Use HV_MAX_FLUSH_REP_COUNT to define length of gpa_list in
struct hv_guest_mapping_flush_list.

Change since v1:
1) Convert "end_gfn" of struct kvm_tlb_range to "pages" in order
to avoid confusion as to whether "end_gfn" is inclusive or exlusive.
2) Add hyperv tlb range struct and replace kvm tlb range struct
with new struct in order to avoid using kvm struct in the hyperv
code directly.



Lan Tianyu (10):
KVM: Add tlb_remote_flush_with_range callback in kvm_x86_ops
x86/hyper-v: Add HvFlushGuestAddressList hypercall support
x86/Hyper-v: Add trace in the
hyperv_nested_flush_guest_mapping_range()
KVM/VMX: Add hv tlb range flush support
KVM/MMU: Add tlb flush with range helper function
KVM: Replace old tlb flush function with new one to flush a specified
range.
KVM: Make kvm_set_spte_hva() return int
KVM/MMU: Move tlb flush in kvm_set_pte_rmapp() to
kvm_mmu_notifier_change_pte()
KVM/MMU: Flush tlb directly in the kvm_set_pte_rmapp()
KVM/MMU: Flush tlb directly in the kvm_zap_gfn_range()

arch/arm/include/asm/kvm_host.h | 2 +-
arch/arm64/include/asm/kvm_host.h | 2 +-
arch/mips/include/asm/kvm_host.h | 2 +-
arch/mips/kvm/mmu.c | 3 +-
arch/powerpc/include/asm/kvm_host.h | 2 +-
arch/powerpc/kvm/book3s.c | 3 +-
arch/powerpc/kvm/e500_mmu_host.c | 3 +-
arch/x86/hyperv/nested.c | 80 +++++++++++++++++++++++++++++++
arch/x86/include/asm/hyperv-tlfs.h | 32 +++++++++++++
arch/x86/include/asm/kvm_host.h | 9 +++-
arch/x86/include/asm/mshyperv.h | 15 ++++++
arch/x86/include/asm/trace/hyperv.h | 14 ++++++
arch/x86/kvm/mmu.c | 96 +++++++++++++++++++++++++++++--------
arch/x86/kvm/paging_tmpl.h | 3 +-
arch/x86/kvm/vmx.c | 63 +++++++++++++++++-------
virt/kvm/arm/mmu.c | 6 ++-
virt/kvm/kvm_main.c | 5 +-
17 files changed, 292 insertions(+), 48 deletions(-)

--
2.14.4

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