[PATCH v2 00/23] Extend test coverage for nested SVM

[Yosry Ahmed <yosry.ahmed@linux.dev>]

There are multiple selftests exercising nested VMX that are not specific
to VMX (at least not anymore). Extend their coverage to nested SVM.

This version is significantly different (and longer) than v1 [1], mainly
due to the change of direction to reuse __virt_pg_map() for nested EPT/NPT
mappings instead of extending the existing nested EPT infrastructure. It
also has a lot more fixups and cleanups.

This series depends on two other series:
- "KVM: SVM: GIF and EFER.SVME are independent" [2]
- "KVM: selftests: Add test of SET_NESTED_STATE with 48-bit L2 on 57-bit L1" [3]

The dependency on the former is because set_nested_state_test is now
also a regression test for that fix. The dependency on the latter is
purely to avoid conflicts.

The patch ordering is not perfect, I did some cleanups toward the end
that arguably should have been moved to the beginning, but I had to stop
rebasing and send the patches out at some point:

Block #1 (patch 1 to patch 7):
- Direct successors to the first 6 patches in v1, addressing review
  comments from Jim and collecting his review tags. These patch extend 5
  of the nVMX tests to cover nSVM.

Block #2 (patch 8 to patch 11):
- Miscellaneous fixups and cleanups.

Block #3 (patch 11 to patch 17):
- Moving nested EPT mapping functions to use __virt_pg_map(), patches 11
  to 15 do the prep work, and patch 16 does the switch. Patch 17 is a
  minor cleanup on top (which arguably fits better in block #2).

Block #4 (patch 18 to 23):
- Patches 18 to 22 are prep work to generalize the nested EPT mapping
  code to work with nested NPT, and patch 23 finally extends the nested
  dirty logging test to work with nSVM using the nested NPT
  infrastructure. Patch 19 is admittedly an imposter in this block and
  should have been in block #2.

[1]https://lore.kernel.org/kvm/20251001145816.1414855-1-yosry.ahmed@linux.dev/
[2]https://lore.kernel.org/kvm/20251009223153.3344555-1-jmattson@google.com/
[3]https://lore.kernel.org/kvm/20250917215031.2567566-1-jmattson@google.com/

Yosry Ahmed (23):
  KVM: selftests: Minor improvements to asserts in
    test_vmx_nested_state()
  KVM: selftests: Extend vmx_set_nested_state_test to cover SVM
  KVM: selftests: Extend vmx_close_while_nested_test to cover SVM
  KVM: selftests: Extend vmx_nested_tsc_scaling_test to cover SVM
  KVM: selftests: Move nested invalid CR3 check to its own test
  KVM: selftests: Extend nested_invalid_cr3_test to cover SVM
  KVM: selftests: Extend vmx_tsc_adjust_test to cover SVM
  KVM: selftests: Stop hardcoding PAGE_SIZE in x86 selftests
  KVM: selftests: Remove the unused argument to prepare_eptp()
  KVM: selftests: Stop using __virt_pg_map() directly in tests
  KVM: selftests: Make sure vm->vpages_mapped is always up-to-date
  KVM: selftests: Parameterize the PTE bitmasks for virt mapping
    functions
  KVM: selftests: Pass the root GPA into virt_get_pte()
  KVM: selftests: Pass the root GPA into __virt_pg_map()
  KVM: selftests: Stop setting AD bits on nested EPTs on creation
  KVM: selftests: Use __virt_pg_map() for nested EPTs
  KVM: selftests: Kill eptPageTablePointer
  KVM: selftests: Generalize nested mapping functions
  KVM: selftests: Move nested MMU mapping functions outside of vmx.c
  KVM: selftests: Stop passing a memslot to nested_map_memslot()
  KVM: selftests: Allow kvm_cpu_has_ept() to be called on AMD CPUs
  KVM: selftests: Set the user bit on nested MMU PTEs
  KVM: selftests: Extend vmx_dirty_log_test to cover SVM

 tools/testing/selftests/kvm/Makefile.kvm      |  11 +-
 .../testing/selftests/kvm/include/kvm_util.h  |   1 +
 .../selftests/kvm/include/x86/processor.h     |  34 ++-
 .../selftests/kvm/include/x86/svm_util.h      |   8 +
 tools/testing/selftests/kvm/include/x86/vmx.h |  15 +-
 tools/testing/selftests/kvm/lib/kvm_util.c    |   3 -
 .../testing/selftests/kvm/lib/x86/memstress.c |   6 +-
 .../testing/selftests/kvm/lib/x86/processor.c | 184 +++++++++++---
 tools/testing/selftests/kvm/lib/x86/svm.c     |  19 ++
 tools/testing/selftests/kvm/lib/x86/vmx.c     | 232 +++---------------
 tools/testing/selftests/kvm/mmu_stress_test.c |   6 +-
 ...ested_test.c => close_while_nested_test.c} |  42 +++-
 .../selftests/kvm/x86/hyperv_features.c       |   2 +-
 tools/testing/selftests/kvm/x86/hyperv_ipi.c  |  18 +-
 .../selftests/kvm/x86/hyperv_tlb_flush.c      |   2 +-
 ...rty_log_test.c => nested_dirty_log_test.c} | 102 +++++---
 .../kvm/x86/nested_invalid_cr3_test.c         | 118 +++++++++
 ...adjust_test.c => nested_tsc_adjust_test.c} |  79 +++---
 ...aling_test.c => nested_tsc_scaling_test.c} |  48 +++-
 ...d_state_test.c => set_nested_state_test.c} | 135 +++++++++-
 .../selftests/kvm/x86/sev_smoke_test.c        |   2 +-
 tools/testing/selftests/kvm/x86/state_test.c  |   2 +-
 .../selftests/kvm/x86/userspace_io_test.c     |   2 +-
 23 files changed, 695 insertions(+), 376 deletions(-)
 rename tools/testing/selftests/kvm/x86/{vmx_close_while_nested_test.c => close_while_nested_test.c} (64%)
 rename tools/testing/selftests/kvm/x86/{vmx_dirty_log_test.c => nested_dirty_log_test.c} (57%)
 create mode 100644 tools/testing/selftests/kvm/x86/nested_invalid_cr3_test.c
 rename tools/testing/selftests/kvm/x86/{vmx_tsc_adjust_test.c => nested_tsc_adjust_test.c} (61%)
 rename tools/testing/selftests/kvm/x86/{vmx_nested_tsc_scaling_test.c => nested_tsc_scaling_test.c} (83%)
 rename tools/testing/selftests/kvm/x86/{vmx_set_nested_state_test.c => set_nested_state_test.c} (67%)

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2.51.0.869.ge66316f041-goog