[PATCH v3 0/6] KVM: arm64: FEAT_RASv1p1 support and RAS selection

[Marc Zyngier <maz@kernel.org>]

This is the next iteration of this series trying to plug some of our
RAS holes (no pun intended...). See [1] for the original series.

The difference with the previous drop is that we don't try to expose a
canonical encoding RASv1p1. Which means you must migrate between
similar implementations for now.

I've also added a cleanup patch at the end, which can be dropped.

Patches on top of v6.17-rc1.

* From v2 [2]:

  - Drop the canonical RASv1p1 advertisement

  - Expose ID_AA64PFR1_EL1.RAS_frac as a writable field

  - Added an extra patch dropping ARM64_FEATURE_MASK(), as it is both
    useless and annoying

  - Pick RB from Joey (thanks!)

* From v1 [1]:

  - Bunch of patches picked by Oliver (thanks!)

  - Added missing SYS_ERXMISC{2,3}_EL1 from the list of handled RAS
    registers

  - Added some rationale about the advertising of RASv1p1 (Cornelia)

  - Picked AB from Catalin (thanks!)

[1] https://lore.kernel.org/kvmarm/20250721101955.535159-1-maz@kernel.org
[2] https://lore.kernel.org/kvmarm/20250806165615.1513164-1-maz@kernel.org

Marc Zyngier (6):
  arm64: Add capability denoting FEAT_RASv1p1
  KVM: arm64: Handle RASv1p1 registers
  KVM: arm64: Ignore HCR_EL2.FIEN set by L1 guest's EL2
  KVM: arm64: Make ID_AA64PFR0_EL1.RAS writable
  KVM: arm64: Make ID_AA64PFR1_EL1.RAS_frac writable
  KVM: arm64: Get rid of ARM64_FEATURE_MASK()

 arch/arm64/include/asm/sysreg.h               |  3 -
 arch/arm64/kernel/cpufeature.c                | 24 ++++++
 arch/arm64/kvm/arm.c                          |  8 +-
 arch/arm64/kvm/hyp/vhe/switch.c               |  5 +-
 arch/arm64/kvm/nested.c                       |  3 +-
 arch/arm64/kvm/sys_regs.c                     | 75 +++++++++++++------
 arch/arm64/tools/cpucaps                      |  1 +
 tools/arch/arm64/include/asm/sysreg.h         |  3 -
 .../selftests/kvm/arm64/aarch32_id_regs.c     |  2 +-
 .../selftests/kvm/arm64/debug-exceptions.c    | 12 +--
 .../testing/selftests/kvm/arm64/no-vgic-v3.c  |  4 +-
 .../selftests/kvm/arm64/page_fault_test.c     |  6 +-
 .../testing/selftests/kvm/arm64/set_id_regs.c |  8 +-
 .../selftests/kvm/arm64/vpmu_counter_access.c |  2 +-
 .../selftests/kvm/lib/arm64/processor.c       |  6 +-
 15 files changed, 107 insertions(+), 55 deletions(-)

-- 
2.39.2