[PATCH v7 00/16] Add support for a few Zc* extensions, Zcmop and Zimop

[Clément Léger]

Add support for (yet again) more RVA23U64 missing extensions. Add
support for Zimop, Zcmop, Zca, Zcf, Zcd and Zcb extensions ISA string
parsing, hwprobe and kvm support. Zce, Zcmt and Zcmp extensions have
been left out since they target microcontrollers/embedded CPUs and are
not needed by RVA23U64.

Since Zc* extensions states that C implies Zca, Zcf (if F and RV32), Zcd
(if D), this series modifies the way ISA string is parsed and now does
it in two phases. First one parses the string and the second one
validates it for the final ISA description.

Link: https://lore.kernel.org/linux-riscv/20240404103254.1752834-1-cleger@rivosinc.com/ [1]
Link: https://lore.kernel.org/all/20240409143839.558784-1-cleger@rivosinc.com/ [2]

---

v7:
 - Rebased on riscv/for-next to fix conflicts

v6:
 - Rebased on riscv/for-next
 - Remove ternary operator to use 'if()' instead in extension checks
 - v5: https://lore.kernel.org/all/20240517145302.971019-1-cleger@rivosinc.com/

v5:
 - Merged in Zimop to avoid any uneeded series dependencies
 - Rework dependency resolution loop to loop on source isa first rather
   than on all extension.
 - Disabled extensions in source isa once set in resolved isa
 - Rename riscv_resolve_isa() parameters
 - v4: https://lore.kernel.org/all/20240429150553.625165-1-cleger@rivosinc.com/

v4:
 - Modify validate() callbacks to return 0, -EPROBEDEFER or another
   error.
 - v3: https://lore.kernel.org/all/20240423124326.2532796-1-cleger@rivosinc.com/

v3:
 - Fix typo "exists" -> "exist"
 - Remove C implies Zca, Zcd, Zcf, dt-bindings rules
 - Rework ISA string resolver to handle dependencies
 - v2: https://lore.kernel.org/all/20240418124300.1387978-1-cleger@rivosinc.com/

v2:
 - Add Zc* dependencies validation in dt-bindings
 - v1: https://lore.kernel.org/lkml/20240410091106.749233-1-cleger@rivosinc.com/

Clément Léger (16):
  dt-bindings: riscv: add Zimop ISA extension description
  riscv: add ISA extension parsing for Zimop
  riscv: hwprobe: export Zimop ISA extension
  RISC-V: KVM: Allow Zimop extension for Guest/VM
  KVM: riscv: selftests: Add Zimop extension to get-reg-list test
  dt-bindings: riscv: add Zca, Zcf, Zcd and Zcb ISA extension
    description
  riscv: add ISA extensions validation callback
  riscv: add ISA parsing for Zca, Zcf, Zcd and Zcb
  riscv: hwprobe: export Zca, Zcf, Zcd and Zcb ISA extensions
  RISC-V: KVM: Allow Zca, Zcf, Zcd and Zcb extensions for Guest/VM
  KVM: riscv: selftests: Add some Zc* extensions to get-reg-list test
  dt-bindings: riscv: add Zcmop ISA extension description
  riscv: add ISA extension parsing for Zcmop
  riscv: hwprobe: export Zcmop ISA extension
  RISC-V: KVM: Allow Zcmop extension for Guest/VM
  KVM: riscv: selftests: Add Zcmop extension to get-reg-list test

 Documentation/arch/riscv/hwprobe.rst          |  28 ++
 .../devicetree/bindings/riscv/extensions.yaml |  95 ++++++
 arch/riscv/include/asm/cpufeature.h           |   1 +
 arch/riscv/include/asm/hwcap.h                |   6 +
 arch/riscv/include/uapi/asm/hwprobe.h         |   6 +
 arch/riscv/include/uapi/asm/kvm.h             |   6 +
 arch/riscv/kernel/cpufeature.c                | 277 ++++++++++++------
 arch/riscv/kernel/sys_hwprobe.c               |   6 +
 arch/riscv/kvm/vcpu_onereg.c                  |  12 +
 .../selftests/kvm/riscv/get-reg-list.c        |  24 ++
 10 files changed, 375 insertions(+), 86 deletions(-)

-- 
2.45.2