[PATCH v4 00/15] KVM/arm64: Add NV support for ERET and PAuth

[Marc Zyngier]

This is the fourth version of this series introducing ERET and PAuth
support for NV guests, and now the base prefix for the NV support
series.

Unless someone shouts, I intend to take this in for 6.10.

* From v3 [3]

  - Check for NV support before checking for HCR_EL2.NV on vpcu exit

  - Rebased on 6.9-rc1

* From v2 [2]

  - Enforce that both Address and Generic authentication use the same
    algorithm

  - Reduce PAuth trapping by eagerly setting the HCR_EL2.API/APK bits

  - Collected RBs, with thanks

  - Rebased on kvmarm-6.9

* From v1 [1]:

  - Don't repaint the ISS_ERET* definitions, but provide reasonable
    helpers instead

  - Dropped superfluous VNCR_EL2 definition

  - Amended comments and creative spelling

[1] https://lore.kernel.org/r/20240219092014.783809-1-maz@kernel.org
[2] https://lore.kernel.org/r/20240226100601.2379693-1-maz@kernel.org
[3] https://lore.kernel.org/r/20240321155356.3236459-1-maz@kernel.org

Marc Zyngier (15):
  KVM: arm64: Harden __ctxt_sys_reg() against out-of-range values
  KVM: arm64: Add helpers for ESR_ELx_ERET_ISS_ERET*
  KVM: arm64: Constraint PAuth support to consistent implementations
  KVM: arm64: nv: Drop VCPU_HYP_CONTEXT flag
  KVM: arm64: nv: Configure HCR_EL2 for FEAT_NV2
  KVM: arm64: nv: Add trap forwarding for ERET and SMC
  KVM: arm64: nv: Fast-track 'InHost' exception returns
  KVM: arm64: nv: Honor HFGITR_EL2.ERET being set
  KVM: arm64: nv: Handle HCR_EL2.{API,APK} independently
  KVM: arm64: nv: Reinject PAC exceptions caused by HCR_EL2.API==0
  KVM: arm64: nv: Add kvm_has_pauth() helper
  KVM: arm64: nv: Add emulation for ERETAx instructions
  KVM: arm64: nv: Handle ERETA[AB] instructions
  KVM: arm64: nv: Advertise support for PAuth
  KVM: arm64: Drop trapping of PAuth instructions/keys

 arch/arm64/include/asm/esr.h            |  12 ++
 arch/arm64/include/asm/kvm_emulate.h    |  10 --
 arch/arm64/include/asm/kvm_host.h       |  26 +++-
 arch/arm64/include/asm/kvm_nested.h     |  13 ++
 arch/arm64/include/asm/kvm_ptrauth.h    |  21 +++
 arch/arm64/include/asm/pgtable-hwdef.h  |   1 +
 arch/arm64/kvm/Makefile                 |   1 +
 arch/arm64/kvm/arm.c                    |  83 +++++++++-
 arch/arm64/kvm/emulate-nested.c         |  66 +++++---
 arch/arm64/kvm/handle_exit.c            |  36 ++++-
 arch/arm64/kvm/hyp/include/hyp/switch.h |  62 +-------
 arch/arm64/kvm/hyp/nvhe/switch.c        |   4 +-
 arch/arm64/kvm/hyp/vhe/switch.c         |  96 +++++++++++-
 arch/arm64/kvm/nested.c                 |   8 +-
 arch/arm64/kvm/pauth.c                  | 196 ++++++++++++++++++++++++
 15 files changed, 514 insertions(+), 121 deletions(-)
 create mode 100644 arch/arm64/kvm/pauth.c

-- 
2.39.2