[PATCH v4 0/5] KVM: x86: Honor EFER_LMSLE_MBZ

[Sean Christopherson]

Jim's series to try to clean up the EFER.LMSLE_MBZ mess (and what a mess it is).
I (still) didn't touch the KVM patches, and barely touched the selftests, i.e.
Jim's testing from v2 should still hold.

v4:
 - Go with a less fancy kvm_is_nested_virtualization_enabled(), because KVM
   sucks (and not in an ironic Primus Sucks! way). [Sashiko]

v3:
 - https://lore.kernel.org/all/20260930002140.3174449-1-seanjc@xxxxxxxxxx
 - Slot in a patch to add kvm_is_nested_virtualization_enabled() instead of
   open coding the check and relying on the X86_FEATURE_SVM cheak to make
   sure it's kvm_amd.ko under the hood (the patch is constructed so that it
   will trigger a noisy conflict with the in-fligh
   host_cpu_is_intel_compatible).

v2: https://lore.kernel.org/all/cover.1790208413.git.jmattson@xxxxxxxxxx

v1: https://lore.kernel.org/all/20260918154530.4129698-1-jmattson@xxxxxxxxxx


Jim Mattson (4):
  KVM: x86: Advertise EFER_LMSLE_MBZ when KVM disallows EFER.LMSLE
  KVM: x86: Honor the guest's EFER_LMSLE_MBZ
  KVM: selftests: Rename svm_nested_clear_efer_svme to
    svm_nested_efer_test
  KVM: selftests: Add coverage for the EFER_LMSLE_MBZ defeature

Sean Christopherson (1):
  KVM: selftests: Add module param API to check if nested virtualization
    is enabled

 Documentation/virt/kvm/api.rst                |  25 ++
 arch/x86/kvm/cpuid.c                          |  20 ++
 arch/x86/kvm/msrs.c                           |  12 +-
 arch/x86/kvm/svm/svm.c                        |  21 +-
 arch/x86/kvm/vmx/vmx.c                        |   7 +
 arch/x86/kvm/x86.c                            |   9 +-
 tools/testing/selftests/kvm/Makefile.kvm      |   2 +-
 .../selftests/kvm/include/x86/processor.h     |  14 +
 .../kvm/x86/svm_nested_clear_efer_svme.c      |  50 ----
 .../selftests/kvm/x86/svm_nested_efer_test.c  | 266 ++++++++++++++++++
 10 files changed, 372 insertions(+), 54 deletions(-)
 delete mode 100644 tools/testing/selftests/kvm/x86/svm_nested_clear_efer_svme.c
 create mode 100644 tools/testing/selftests/kvm/x86/svm_nested_efer_test.c


base-commit: d4b7fb647204f0c81dfeae2d1a708e4d858e0c94
-- 
2.56.0.rc1.315.gc6ed9934b7-goog