Merge patch series "riscv: fix ptrace and export VLENB"

Merge patch series "riscv: fix ptrace and export VLENB"

Andy Chiu <andy.chiu@sifive.com> says:

We add a vlenb field in Vector context and save it with the
riscv_vstate_save() macro. It should not cause performance regression as
VLENB is a design-time constant and is frequently used by hardware.
Also, adding this field into the __sc_riscv_v_state may benifit us on a
future compatibility issue becuse a hardware may have writable VLENB.

Adding and saving VLENB have an immediate benifit as it gives ptrace a
better view of the Vector extension and makes it possible to reconstruct
Vector register files from the dump without doing an additional csr read.

This patchset also sync the number of note types between us and gdb for
riscv to solve a conflicting note.

This is not an ABI break given that 6.5 has not been released yet.

* b4-shazam-merge:
  RISC-V: vector: export VLENB csr in __sc_riscv_v_state
  RISC-V: Remove ptrace support for vectors

Link: https://lore.kernel.org/r/20230816155450.26200-1-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>