[PATCH v2 00/15] KVM: arm64: nv: FPSIMD/SVE, plus some other CPTR goodies

[Oliver Upton <oliver.upton@linux.dev>]

As discussed, here's the combined series of Marc + I's patches that
implement all the trap forwarding / merging logic required to observe
the L1 CPTR configuration when running an L2 guest.

Like before, this was tested on Neoverse-V2 with L0, L1, and L2 running
fpsimd-test and sve-test on top of one another.

v1 [1] -> v2:
 - Grab Marc's CPTR trap patches [2]
 - Avoid taking two traps when L1 accesses ZCR_EL2 while the host owns
   FP regs. The fast path will now load the FP regs and forward the
   sysreg trap to the slow path for complete handling.
 - Add a comment describing the above behavior (Marc)
 - Avoid the use of guest_hyp_*_traps_enabled() in
   __activate_cptr_traps() for better codegen (Marc)
 - Document the reason for only testing bit[0] of CPTR_EL2.xEN when
   folding L1 traps into the hardware CPTR value.
 - Add a helper for synthesizing SVE traps, rather than open-coding the
   ESR value in access_zcr_el2()

[1]: https://lore.kernel.org/kvmarm/20240531231358.1000039-1-oliver.upton@linux.dev/
[2]: https://lore.kernel.org/kvmarm/20240604130553.199981-1-maz@kernel.org/

Jintack Lim (1):
  KVM: arm64: nv: Forward FP/ASIMD traps to guest hypervisor

Marc Zyngier (4):
  KVM: arm64: nv: Handle CPACR_EL1 traps
  KVM: arm64: nv: Add TCPAC/TTA to CPTR->CPACR conversion helper
  KVM: arm64: nv: Add trap description for CPTR_EL2
  KVM: arm64: nv: Add additional trap setup for CPTR_EL2

Oliver Upton (10):
  KVM: arm64: nv: Forward SVE traps to guest hypervisor
  KVM: arm64: nv: Load guest FP state for ZCR_EL2 trap
  KVM: arm64: nv: Load guest hyp's ZCR into EL1 state
  KVM: arm64: nv: Handle ZCR_EL2 traps
  KVM: arm64: nv: Save guest's ZCR_EL2 when in hyp context
  KVM: arm64: nv: Use guest hypervisor's max VL when running nested
    guest
  KVM: arm64: nv: Ensure correct VL is loaded before saving SVE state
  KVM: arm64: Spin off helper for programming CPTR traps
  KVM: arm64: nv: Honor guest hypervisor's FP/SVE traps in CPTR_EL2
  KVM: arm64: Allow the use of SVE+NV

 arch/arm64/include/asm/kvm_emulate.h    |  55 +++++++++
 arch/arm64/include/asm/kvm_host.h       |   7 ++
 arch/arm64/include/asm/kvm_nested.h     |   5 +-
 arch/arm64/kvm/arm.c                    |   5 -
 arch/arm64/kvm/emulate-nested.c         |  91 ++++++++++++++
 arch/arm64/kvm/fpsimd.c                 |  22 +++-
 arch/arm64/kvm/handle_exit.c            |  19 ++-
 arch/arm64/kvm/hyp/include/hyp/switch.h |  24 +++-
 arch/arm64/kvm/hyp/vhe/switch.c         | 156 ++++++++++++++++++++----
 arch/arm64/kvm/nested.c                 |   3 +-
 arch/arm64/kvm/sys_regs.c               |  38 ++++++
 11 files changed, 380 insertions(+), 45 deletions(-)


base-commit: c3f38fa61af77b49866b006939479069cd451173
-- 
2.45.2.627.g7a2c4fd464-goog