mirror of
https://github.com/torvalds/linux.git
synced 2026-07-29 10:41:49 +02:00
Linux kernel source tree
5bde575013
Peilin Ye says: ==================== Introduce load-acquire and store-release BPF instructions This patchset adds kernel support for BPF load-acquire and store-release instructions (for background, please see [1]), including core/verifier and arm64/x86-64 JIT compiler changes, as well as selftests. riscv64 is also planned to be supported. The corresponding LLVM changes can be found at: https://github.com/llvm/llvm-project/pull/108636 The first 3 patches from v4 have already been applied: - [bpf-next,v4,01/10] bpf/verifier: Factor out atomic_ptr_type_ok() https://git.kernel.org/bpf/bpf-next/c/b2d9ef71d4c9 - [bpf-next,v4,02/10] bpf/verifier: Factor out check_atomic_rmw() https://git.kernel.org/bpf/bpf-next/c/d430c46c7580 - [bpf-next,v4,03/10] bpf/verifier: Factor out check_load_mem() and check_store_reg() https://git.kernel.org/bpf/bpf-next/c/d38ad248fb7a Please refer to the LLVM PR and individual kernel patches for details. Thanks! v5: https://lore.kernel.org/all/cover.1741046028.git.yepeilin@google.com/ v5..v6 change: o (Alexei) avoid using #ifndef in verifier.c v4: https://lore.kernel.org/bpf/cover.1740978603.git.yepeilin@google.com/ v4..v5 notable changes: o (kernel test robot) for 32-bit arches: make the verifier reject 64-bit load-acquires/store-releases, and fix build error in interpreter changes * tested ARCH=arc build following instructions from kernel test robot o (Alexei) drop Documentation/ patch (v4 10/10) for now v3: https://lore.kernel.org/bpf/cover.1740009184.git.yepeilin@google.com/ v3..v4 notable changes: o (Alexei) add x86-64 JIT support (including arena) o add Acked-by: tags from Xu v2: https://lore.kernel.org/bpf/cover.1738888641.git.yepeilin@google.com/ v2..v3 notable changes: o (Alexei) change encoding to BPF_LOAD_ACQ=0x100, BPF_STORE_REL=0x110 o add Acked-by: tags from Ilya and Eduard o make new selftests depend on: * __clang_major__ >= 18, and * ENABLE_ATOMICS_TESTS is defined (currently this means -mcpu=v3 or v4), and * JIT supports load_acq/store_rel (currenty only arm64) o work around llvm-17 CI job failure by conditionally define __arena_global variables as 64-bit if __clang_major__ < 18, to make sure .addr_space.1 has no holes o add Google copyright notice in new files v1: https://lore.kernel.org/all/cover.1737763916.git.yepeilin@google.com/ v1..v2 notable changes: o (Eduard) for x86 and s390, make bpf_jit_supports_insn(..., /*in_arena=*/true) return false for load_acq/store_rel o add Eduard's Acked-by: tag o (Eduard) extract LDX and non-ATOMIC STX handling into helpers, see PATCH v2 3/9 o allow unpriv programs to store-release pointers to stack o (Alexei) make it clearer in the interpreter code (PATCH v2 4/9) that only W and DW are supported for atomic RMW o test misaligned load_acq/store_rel o (Eduard) other selftests/ changes: * test load_acq/store_rel with !atomic_ptr_type_ok() pointers: - PTR_TO_CTX, for is_ctx_reg() - PTR_TO_PACKET, for is_pkt_reg() - PTR_TO_FLOW_KEYS, for is_flow_key_reg() - PTR_TO_SOCKET, for is_sk_reg() * drop atomics/ tests * delete unnecessary 'pid' checks from arena_atomics/ tests * avoid depending on __BPF_FEATURE_LOAD_ACQ_STORE_REL, use __imm_insn() and inline asm macros instead RFC v1: https://lore.kernel.org/all/cover.1734742802.git.yepeilin@google.com RFC v1..v1 notable changes: o 1-2/8: minor verifier.c refactoring patches o 3/8: core/verifier changes * (Eduard) handle load-acquire properly in backtrack_insn() * (Eduard) avoid skipping checks (e.g., bpf_jit_supports_insn()) for load-acquires * track the value stored by store-releases, just like how non-atomic STX instructions are handled * (Eduard) add missing link in commit message * (Eduard) always print 'r' for disasm.c changes o 4/8: arm64/insn: avoid treating load_acq/store_rel as load_ex/store_ex o 5/8: arm64/insn: add load_acq/store_rel * (Xu) include Should-Be-One (SBO) bits in "mask" and "value", to avoid setting fixed bits during runtime (JIT-compile time) o 6/8: arm64 JIT compiler changes * (Xu) use emit_a64_add_i() for "pointer + offset" to optimize code emission o 7/8: selftests * (Eduard) avoid adding new tests to the 'test_verifier' runner * add more tests, e.g., checking mark_precise logic o 8/8: instruction-set.rst changes [1] https://lore.kernel.org/all/20240729183246.4110549-1-yepeilin@google.com/ Thanks, ==================== Link: https://patch.msgid.link/cover.1741049567.git.yepeilin@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.