[PATCH v3 00/15] KVM: arm64: nv: Implement FEAT_XNX and FEAT_HAF

[Oliver Upton <oupton@kernel.org>]

Fixes all the issues Marc found in v2:

v2: https://lore.kernel.org/kvmarm/20251117224325.2431848-1-oupton@kernel.org/

v2 -> v3:
 - Don't use uninitialized XN value in kvm_pgtable_stage2_relax_perms()
 - Pass vcpu pointer directly in the stage-2 PTW
 - Ensure LL/SC swap implementation correctly handles compare failures
 - Fix SRCU imbalance

Oliver Upton (15):
  arm64: Detect FEAT_XNX
  KVM: arm64: Add support for FEAT_XNX stage-2 permissions
  KVM: arm64: nv: Forward FEAT_XNX permissions to the shadow stage-2
  KVM: arm64: Teach ptdump about FEAT_XNX permissions
  KVM: arm64: nv: Advertise support for FEAT_XNX
  KVM: arm64: Call helper for reading descriptors directly
  KVM: arm64: nv: Stop passing vCPU through void ptr in S2 PTW
  KVM: arm64: Handle endianness in read helper for emulated PTW
  KVM: arm64: nv: Use pgtable definitions in stage-2 walk
  KVM: arm64: Add helper for swapping guest descriptor
  KVM: arm64: Propagate PTW errors up to AT emulation
  KVM: arm64: Implement HW access flag management in stage-1 SW PTW
  KVM: arm64: nv: Implement HW access flag management in stage-2 SW PTW
  KVM: arm64: nv: Expose hardware access flag management to NV guests
  KVM: arm64: selftests: Add test for AT emulation

 arch/arm64/include/asm/kvm_asm.h              |   6 +-
 arch/arm64/include/asm/kvm_nested.h           |  40 +++-
 arch/arm64/include/asm/kvm_pgtable.h          |  17 +-
 arch/arm64/kernel/cpufeature.c                |   7 +
 arch/arm64/kvm/at.c                           | 186 ++++++++++++++++--
 arch/arm64/kvm/hyp/pgtable.c                  |  58 +++++-
 arch/arm64/kvm/mmu.c                          |  28 ++-
 arch/arm64/kvm/nested.c                       | 126 ++++++++----
 arch/arm64/kvm/ptdump.c                       |  35 +++-
 arch/arm64/kvm/sys_regs.c                     |   9 +-
 arch/arm64/tools/cpucaps                      |   1 +
 tools/testing/selftests/kvm/Makefile.kvm      |   1 +
 tools/testing/selftests/kvm/arm64/at.c        | 172 ++++++++++++++++
 .../testing/selftests/kvm/include/kvm_util.h  |   1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |  10 +
 15 files changed, 602 insertions(+), 95 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/arm64/at.c


base-commit: dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa
-- 
2.47.3