Merge branch 'support-kcfi-bpf-on-arm64'

Sami Tolvanen says:

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Support kCFI + BPF on arm64

These patches add KCFI types to arm64 BPF JIT output. Puranjay and
Maxwell have been working on this for some time now, but I haven't
seen any progress since June 2024, so I decided to pick up the latest
version[1] posted by Maxwell and fix the few remaining issues I
noticed. I confirmed that with these patches applied, I no longer see
CFI failures in jitted code when running BPF self-tests on arm64.

[1] https://lore.kernel.org/linux-arm-kernel/ptrugmna4xb5o5lo4xislf4rlz7avdmd4pfho5fjwtjj7v422u@iqrwfrbwuxrq/

Sami
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v14:
- Rebased to fix a merge conflict.

v13: https://lore.kernel.org/bpf/[email protected]/
- Added emit_u32_data to fix type hashes on big-endian systems based
  on Xu's suggestion.

v12: https://lore.kernel.org/bpf/[email protected]/
- Fixed sparse warnings and 32-bit ARM build errors.

v11: https://lore.kernel.org/bpf/[email protected]/
- Moved cfi_get_func_hash to a static inline with an ifdef guard.
- Picked by Will's Acked-by tags.

v10: https://lore.kernel.org/bpf/[email protected]/
- Rebased to bpf-next/master again.
- Added a patch to moved duplicate type hash variables and helper
  functions to common CFI code.

v9: https://lore.kernel.org/bpf/[email protected]/
- Rebased to bpf-next/master to fix merge x86 merge conflicts.
- Fixed checkpatch warnings about Co-developed-by tags and including
  <asm/cfi.h>.
- Picked up Tested-by tags.

v8: https://lore.kernel.org/bpf/[email protected]/
- Changed DEFINE_CFI_TYPE to use .4byte to match __CFI_TYPE.
- Changed cfi_get_func_hash() to again use get_kernel_nofault().
- Fixed a panic in bpf_jit_free() by resetting prog->bpf_func before
  calling bpf_jit_binary_pack_hdr().

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====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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