Prior to commit 9245fd6b8531 ("KVM: x86: model canonical checks more
precisely"), KVM_SET_NESTED_STATE would fail if the state was captured
with L2 active, L1 had CR4.LA57 set, L2 did not, and the
VMCS12.HOST_GSBASE (or other host-state field checked for canonicality)
had an address greater than 48 bits wide.

Add a regression test that reproduces the KVM_SET_NESTED_STATE failure
conditions. To do so, the first three patches add support for 5-level
paging in the selftest L1 VM.

Jim Mattson (4):
  KVM: selftests: Use a loop to create guest page tables
  KVM: selftests: Use a loop to walk guest page tables
  KVM: selftests: Add VM_MODE_PXXV57_4K VM mode
  KVM: selftests: Add a VMX test for LA57 nested state

 tools/testing/selftests/kvm/Makefile.kvm      |   1 +
 .../testing/selftests/kvm/include/kvm_util.h  |   1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |  21 +++
 .../testing/selftests/kvm/lib/x86/processor.c |  66 ++++-----
 tools/testing/selftests/kvm/lib/x86/vmx.c     |   7 +-
 .../kvm/x86/vmx_la57_nested_state_test.c      | 137 ++++++++++++++++++
 6 files changed, 195 insertions(+), 38 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86/vmx_la57_nested_state_test.c

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2.51.0.470.ga7dc726c21-goog