[v4,00/12] KVM: nVMX: Enlightened VMCS for Hyper-V on KVM

Message

Vitaly Kuznetsov Aug. 8, 2018, 3:55 p.m. UTC

Changes since v3:
- Rebase to the current kvm/queue.
- Add nested state migration support [Paolo Bonzini]
- Add a selftest [Paolo Bonzini]

Patches 7-12 are new in v4.

Description:

This is an initial implementation of Enlightened VMCS for nested Hyper-V on
KVM. Using it helps to spare 1500 cpu cycles for nested vmexit (tight cpuid
loop in WS2016 with Hyper-V role on KVM: 15200 cycles -> 13700 cycles).

Ladi Prosek (1):
  KVM: hyperv: define VP assist page helpers

Vitaly Kuznetsov (11):
  KVM: VMX: refactor evmcs_sanitize_exec_ctrls()
  KVM: nVMX: add KVM_CAP_HYPERV_ENLIGHTENED_VMCS capability
  KVM: nVMX: add enlightened VMCS state
  KVM: nVMX: implement enlightened VMPTRLD and VMCLEAR
  KVM: nVMX: optimize prepare_vmcs02{,_full} for Enlightened VMCS case
  x86/kvm/hyperv: don't clear VP assist pages on init
  x86/kvm/lapic: preserve gfn_to_hva_cache len on cache reinit
  x86/kvm/nVMX: allow bare VMXON state migration
  x86/kvm/nVMX: nested state migration for Enlightened VMCS
  KVM: selftests: compile against local uapi headers
  KVM: selftests: add Enlightened VMCS test

 arch/x86/include/asm/kvm_host.h             |    3 +
 arch/x86/include/uapi/asm/kvm.h             |    1 +
 arch/x86/kvm/hyperv.c                       |   31 +-
 arch/x86/kvm/hyperv.h                       |    4 +
 arch/x86/kvm/lapic.c                        |   14 +-
 arch/x86/kvm/lapic.h                        |    2 +-
 arch/x86/kvm/svm.c                          |    9 +
 arch/x86/kvm/vmx.c                          |  886 +++++++++++++++++----
 arch/x86/kvm/x86.c                          |   23 +-
 include/uapi/linux/kvm.h                    |    1 +
 tools/testing/selftests/kvm/Makefile        |    3 +-
 tools/testing/selftests/kvm/evmcs_test.c    |  181 +++++
 tools/testing/selftests/kvm/include/evmcs.h | 1099 +++++++++++++++++++++++++++
 tools/testing/selftests/kvm/include/vmx.h   |   28 +
 tools/testing/selftests/kvm/lib/vmx.c       |   48 +-
 15 files changed, 2151 insertions(+), 182 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/evmcs_test.c
 create mode 100644 tools/testing/selftests/kvm/include/evmcs.h