[PATCH v4 00/26] KVM/arm64: VM configuration enforcement

[Marc Zyngier <maz@kernel.org>]

This is the fourth version of this configurationm enforcement series
after additional reviewing from Suzuki and Oliver. Many thanks to
both.

I think I have taken most of the feedback into account, but please
shout if I have ignored something.

* From v3: [3]

  - Fixed copy-paste issue while testing for the PAC flags

  - Added Suzuki's RB on patch #2

* From v2: [2]

  - Fix totally broken handling of negative features by delegating the
    work that requires a functionnal brain to other people

  - Fix handling of HCR_ENSCXT as RES0 instead of RES1 (and its
    consequences...)

  - Add handling of VTTBR_EL2.CNP being RES0

  - Add a snapshot of all RES0/RES1 fields so that we can catch them
    being changed behind our backs

  - Various cleanups

* From v1: [1]

  - Fix embarrassing crash with FEAT_MOPS

  - Better error handling in the FGT code

  - Added/Fixed comments

  - Simplified the __vcpu_sys_reg() macro

  - Fixed FEAT_PIR handling

  - Folded in Oliver's PMU rework

[1] https://lore.kernel.org/all/20240122201852.262057-1-maz@kernel.org
[2] https://lore.kernel.org/all/20240130204533.693853-1-maz@kernel.org
[3] https://lore.kernel.org/all/20240205103431.1104133-1-maz@kernel.org

Marc Zyngier (26):
  arm64: sysreg: Add missing ID_AA64ISAR[13]_EL1 fields and variants
  KVM: arm64: Add feature checking helpers
  KVM: arm64: nv: Add sanitising to VNCR-backed sysregs
  KVM: arm64: nv: Add sanitising to EL2 configuration registers
  KVM: arm64: nv: Add sanitising to VNCR-backed FGT sysregs
  KVM: arm64: nv: Add sanitising to VNCR-backed HCRX_EL2
  KVM: arm64: nv: Drop sanitised_sys_reg() helper
  KVM: arm64: Unify HDFG[WR]TR_GROUP FGT identifiers
  KVM: arm64: nv: Correctly handle negative polarity FGTs
  KVM: arm64: nv: Turn encoding ranges into discrete XArray stores
  KVM: arm64: Drop the requirement for XARRAY_MULTI
  KVM: arm64: nv: Move system instructions to their own sys_reg_desc
    array
  KVM: arm64: Always populate the trap configuration xarray
  KVM: arm64: Register AArch64 system register entries with the sysreg
    xarray
  KVM: arm64: Use the xarray as the primary sysreg/sysinsn walker
  KVM: arm64: Rename __check_nv_sr_forward() to triage_sysreg_trap()
  KVM: arm64: Add Fine-Grained UNDEF tracking information
  KVM: arm64: Propagate and handle Fine-Grained UNDEF bits
  KVM: arm64: Move existing feature disabling over to FGU infrastructure
  KVM: arm64: Streamline save/restore of HFG[RW]TR_EL2
  KVM: arm64: Make TLBI OS/Range UNDEF if not advertised to the guest
  KVM: arm64: Make PIR{,E0}_EL1 UNDEF if S1PIE is not advertised to the
    guest
  KVM: arm64: Make AMU sysreg UNDEF if FEAT_AMU is not advertised to the
    guest
  KVM: arm64: Make FEAT_MOPS UNDEF if not advertised to the guest
  KVM: arm64: Snapshot all non-zero RES0/RES1 sysreg fields for later
    checking
  KVM: arm64: Add debugfs file for guest's ID registers

 arch/arm64/include/asm/kvm_arm.h           |   4 +-
 arch/arm64/include/asm/kvm_host.h          |  98 +++++++-
 arch/arm64/include/asm/kvm_nested.h        |   1 -
 arch/arm64/kvm/Kconfig                     |   1 -
 arch/arm64/kvm/arm.c                       |   7 +
 arch/arm64/kvm/check-res-bits.h            | 121 ++++++++++
 arch/arm64/kvm/emulate-nested.c            | 231 +++++++++++++-----
 arch/arm64/kvm/hyp/include/hyp/switch.h    | 130 +++++-----
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h |  24 +-
 arch/arm64/kvm/nested.c                    | 267 ++++++++++++++++++++-
 arch/arm64/kvm/pmu-emul.c                  |  11 +-
 arch/arm64/kvm/sys_regs.c                  | 238 +++++++++++++++---
 arch/arm64/kvm/sys_regs.h                  |   2 +
 arch/arm64/tools/sysreg                    |   8 +-
 include/kvm/arm_pmu.h                      |  11 -
 15 files changed, 973 insertions(+), 181 deletions(-)
 create mode 100644 arch/arm64/kvm/check-res-bits.h

-- 
2.39.2


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