kernel/Documentation/rust/arch-support.rst, branch linux-rolling-stable

ARM: 9441/1: rust: Enable Rust support for ARMv7

2025-03-26T13:31:16Z

This commit allows building ARMv7 kernels with Rust support. The rust core library expects some __eabi_... functions that are not implemented in the kernel. Those functions are some float operations and __aeabi_uldivmod. For now those are implemented with define_panicking_intrinsics!. This is based on the code by Sven Van Asbroeck from the original rust branch and inspired by the AArch version by Jamie Cunliffe. I have tested the rust samples and a custom simple MMIO module on hardware (De1SoC FPGA + Arm A9 CPU). Tested-by: Rudraksha Gupta Reviewed-by: Alice Ryhl Acked-by: Miguel Ojeda Tested-by: Miguel Ojeda Acked-by: Ard Biesheuvel Signed-off-by: Christian Schrefl Signed-off-by: Russell King (Oracle)

RISC-V: disallow gcc + rust builds

2024-10-25T13:18:37Z

During the discussion before supporting rust on riscv, it was decided not to support gcc yet, due to differences in extension handling compared to llvm (only the version of libclang matching the c compiler is supported). Recently Jason Montleon reported [1] that building with gcc caused build issues, due to unsupported arguments being passed to libclang. After some discussion between myself and Miguel, it is better to disable gcc + rust builds to match the original intent, and subsequently support it when an appropriate set of extensions can be deduced from the version of libclang. Closes: https://lore.kernel.org/all/20240917000848.720765-2-jmontleo@redhat.com/ [1] Link: https://lore.kernel.org/all/20240926-battering-revolt-6c6a7827413e@spud/ [2] Fixes: 70a57b247251a ("RISC-V: enable building 64-bit kernels with rust support") Cc: stable@vger.kernel.org Reported-by: Jason Montleon Signed-off-by: Conor Dooley Acked-by: Miguel Ojeda Reviewed-by: Nathan Chancellor Link: https://lore.kernel.org/r/20241001-playlist-deceiving-16ece2f440f5@spud Signed-off-by: Palmer Dabbelt

arch: um: rust: Add i386 support for Rust

2024-07-03T10:22:22Z

At present, Rust in the kernel only supports 64-bit x86, so UML has followed suit. However, it's significantly easier to support 32-bit i386 on UML than on bare metal, as UML does not use the -mregparm option (which alters the ABI), which is not yet supported by rustc[1]. Add support for CONFIG_RUST on um/i386, by adding a new target config to generate_rust_target, and replacing various checks on CONFIG_X86_64 to also support CONFIG_X86_32. We still use generate_rust_target, rather than a built-in rustc target, in order to match x86_64, provide a future place for -mregparm, and more easily disable floating point instructions. With these changes, the KUnit tests pass with: kunit.py run --make_options LLVM=1 --kconfig_add CONFIG_RUST=y --kconfig_add CONFIG_64BIT=n --kconfig_add CONFIG_FORTIFY_SOURCE=n An earlier version of these changes was proposed on the Rust-for-Linux github[2]. [1]: https://github.com/rust-lang/rust/issues/116972 [2]: https://github.com/Rust-for-Linux/linux/pull/966 Signed-off-by: David Gow Link: https://patch.msgid.link/20240604224052.3138504-1-davidgow@google.com Signed-off-by: Johannes Berg

Merge tag 'riscv-for-linus-6.10-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2024-05-22T16:56:00Z

Pull RISC-V updates from Palmer Dabbelt: - Add byte/half-word compare-and-exchange, emulated via LR/SC loops - Support for Rust - Support for Zihintpause in hwprobe - Add PR_RISCV_SET_ICACHE_FLUSH_CTX prctl() - Support lockless lockrefs * tag 'riscv-for-linus-6.10-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (42 commits) riscv: defconfig: Enable CONFIG_CLK_SOPHGO_CV1800 riscv: select ARCH_HAS_FAST_MULTIPLIER riscv: mm: still create swiotlb buffer for kmalloc() bouncing if required riscv: Annotate pgtable_l{4,5}_enabled with __ro_after_init riscv: Remove redundant CONFIG_64BIT from pgtable_l{4,5}_enabled riscv: mm: Always use an ASID to flush mm contexts riscv: mm: Preserve global TLB entries when switching contexts riscv: mm: Make asid_bits a local variable riscv: mm: Use a fixed layout for the MM context ID riscv: mm: Introduce cntx2asid/cntx2version helper macros riscv: Avoid TLB flush loops when affected by SiFive CIP-1200 riscv: Apply SiFive CIP-1200 workaround to single-ASID sfence.vma riscv: mm: Combine the SMP and UP TLB flush code riscv: Only send remote fences when some other CPU is online riscv: mm: Broadcast kernel TLB flushes only when needed riscv: Use IPIs for remote cache/TLB flushes by default riscv: Factor out page table TLB synchronization riscv: Flush the instruction cache during SMP bringup riscv: hwprobe: export Zihintpause ISA extension riscv: misaligned: remove CONFIG_RISCV_M_MODE specific code ...

RISC-V: enable building 64-bit kernels with rust support

2024-04-28T21:50:34Z

The rust modules work on 64-bit RISC-V, with no twiddling required. Select HAVE_RUST and provide the required flags to kbuild so that the modules can be used. The Makefile and Kconfig changes are lifted from work done by Miguel in the Rust-for-Linux tree, hence his authorship. Following the rabbit hole, the Makefile changes originated in a script, created based on config files originally added by Gary, hence his co-authorship. 32-bit is broken in core rust code, so support is limited to 64-bit: ld.lld: error: undefined symbol: __udivdi3 As 64-bit RISC-V is now supported, add it to the arch support table. Co-developed-by: Gary Guo Signed-off-by: Gary Guo Signed-off-by: Miguel Ojeda Co-developed-by: Conor Dooley Signed-off-by: Conor Dooley Link: https://lore.kernel.org/r/20240409-silencer-book-ce1320f06aab@spud Signed-off-by: Palmer Dabbelt

docs: rust: fix improper rendering in Arch Support page

2024-03-31T18:45:18Z

Fix improper rendering of table cell (empty bullet list) by rendering as a dash using the backslash escaping mechanism [1]. Link: https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#escaping-mechanism [1] Reported-by: Miguel Ojeda Closes: https://github.com/Rust-for-Linux/linux/issues/1069 Signed-off-by: Bo-Wei Chen Reviewed-by: Benno Lossin Fixes: 90868ff9cade ("LoongArch: Enable initial Rust support") Link: https://lore.kernel.org/r/20240324010915.3089934-1-tim.chenbw@gmail.com [ Reworded slightly title and message; use "Link:" tag. ] Signed-off-by: Miguel Ojeda

arm64: rust: Enable Rust support for AArch64

2024-02-09T16:12:36Z

This commit provides the build flags for Rust for AArch64. The core Rust support already in the kernel does the rest. This enables the PAC ret and BTI options in the Rust build flags to match the options that are used when building C. The Rust samples have been tested with this commit. Signed-off-by: Jamie Cunliffe Acked-by: Will Deacon Tested-by: Dirk Behme Tested-by: Boqun Feng Acked-by: Miguel Ojeda Acked-by: Catalin Marinas Tested-by: Alice Ryhl Tested-by: Fabien Parent Link: https://lore.kernel.org/r/20231020155056.3495121-3-Jamie.Cunliffe@arm.com Signed-off-by: Catalin Marinas

LoongArch: Enable initial Rust support

2024-01-17T04:43:00Z

Enable initial Rust support for LoongArch. Tested-by: Miguel Ojeda Signed-off-by: WANG Rui Signed-off-by: Huacai Chen

rust: sort uml documentation arch support table

2023-04-06T21:11:04Z

The arch_support table was not sorted alphabetically. Sorts the table properly. Fixes: 0438aadfa69a ("rust: arch/um: Add support for CONFIG_RUST under x86_64 UML") Link: https://lore.kernel.org/rust-for-linux/CANiq72nXMsnUsJNZOG-QZiCVOqa9dRUSMc4RAS3ExLZNJ7VhHg@mail.gmail.com Reported-by: Miguel Ojeda Signed-off-by: Thomas Bamelis Reviewed-by: David Gow Signed-off-by: Miguel Ojeda

Documentation: rust: Fix arch support table

2023-02-13T09:14:32Z

Stephen Rothwell reported htmldocs warning when merging uml tree: Documentation/rust/arch-support.rst:20: WARNING: Blank line required after table. Fix the arch support table by removing extraneous simple table marker. Link: https://lore.kernel.org/linux-next/20230213152714.78b844f4@canb.auug.org.au/ Fixes: 0438aadfa69a34 ("rust: arch/um: Add support for CONFIG_RUST under x86_64 UML") Reported-by: Stephen Rothwell Signed-off-by: Bagas Sanjaya Signed-off-by: Richard Weinberger