[v10,0/9] Add Rust build support, ARM PL011 device impl

WARNING: This series contains a patch with blob diffs and thus problems
may arise with your patch workflow. The revision is available at
https://gitlab.com/epilys/qemu/-/tree/rust-v10 for you to fetch.

rust-v10 head: 29f226178b5af97612cc8d1c8401959c6f41f027

Hello everyone,

This series adds:

- build system support for the Rust compiler
- a small Rust library, qemu-api, which includes bindings to QEMU's C
  interface generated with bindgen, and qemu-api-macros, a procedural
  macro library.
- a proof of concept ARM PL011 device implementation in Rust, chosen for
  its low complexity. The device is used in the arm virt machine if qemu
  is compiled with rust enabled (./configure --enable-rust [...])

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
Changes in v10:
- Removed unnecessary meson version check (thanks Alex)
- Added warning in `configure` when Rust is not disabled about what to
  do if bindgen does not detect the correct libclang and fails to find
  certain system header files.
- Disabled rust qemu allocator by default
- Added changes by Paolo to detect the correct rust target for cross
  compilation in `configure` script.
- Made PL011State::init fn unsafe (Paolo)
- Link to v9: https://lore.kernel.org/r/20240827-rust-pl011-v9-0-e90b9c28f861@linaro.org

Changes in v9:
- Addressed v8 review comment: removed rustfmt.toml symlink (Junjie Mao)
- Addressed v8 review comment: removed unused cstr files (Junjie Mao)
- Addressed v8 review comment: added HAVE_GLIB_WITH_ALIGNED_ALLOC config
  host def to check whether glib's aligned alloc functions are available (Junjie Mao)
- qemu_api: Changed default alignment condition in allocator (alignment
  is always nonzero)
- qemu_api: Enabled allocator by default in builds
- pl011: fixed invalid cast of byte buffer to u32 in pl011_receive()
  leading to misaligned read

- Link to v8: https://lore.kernel.org/r/20240823-rust-pl011-v8-0-b9f5746bdaf3@linaro.org

Changes in v8:
- Allow for compilation of more than one Rust-based component in Meson
  by compiling all Rust static libraries into one "root" library before
  linking it to each target emulation executable.
- Added a qemu_api_macros procedural macro library.
- (minor) Moved generated bindings.rs to qemu_api crate using meson's
  structured_source() instead of compiling it as a standalone crate
  which was unnecessary.
- (minor) Removed unnecessary rustc optimization/debug flags (should be handled
  by meson instead).
- (minor) Moved build scripts under scripts/rust/
- (minor) Fixed license issues

Previous version was: <20240815-rust-pl011-v7-0-975135e98831@linaro.org>

https://lore.kernel.org/qemu-devel/20240815-rust-pl011-v7-0-975135e98831@linaro.org/

Outstanding issues that are not blocking for merge are:

- Cross-compilation for aarch64 is not possible out-of-the-box because of this bug:
  <https://github.com/rust-lang/rust/issues/125619> in llvm which when
  fixed, must be ported to upstream rust's llvm fork. Since the problem
  is an extraneous symbol we could strip it with objcopy -N|--strip-symbol
  Fix is in upstream llvm, we're awaiting for rust upstream to pick it up.

---
Manos Pitsidianakis (7):
      build-sys: Add rust feature option
      rust: add bindgen step as a meson dependency
      .gitattributes: add Rust diff and merge attributes
      meson.build: add HAVE_GLIB_WITH_ALIGNED_ALLOC flag
      rust: add crate to expose bindings and interfaces
      rust: add utility procedural macro crate
      rust: add PL011 device model

Paolo Bonzini (2):
      Require meson version 1.5.0
      configure, meson: detect Rust toolchain

 MAINTAINERS                                        |  21 +
 configure                                          | 170 +++++-
 meson.build                                        |  98 +++-
 rust/wrapper.h                                     |  47 ++
 .gitattributes                                     |   3 +
 Kconfig                                            |   1 +
 Kconfig.host                                       |   3 +
 hw/arm/Kconfig                                     |  33 +-
 meson_options.txt                                  |   3 +
 python/scripts/vendor.py                           |   4 +-
 python/wheels/meson-1.2.3-py3-none-any.whl         | Bin 964928 -> 0 bytes
 python/wheels/meson-1.5.0-py3-none-any.whl         | Bin 0 -> 959846 bytes
 pythondeps.toml                                    |   2 +-
 rust/.gitignore                                    |   3 +
 rust/Kconfig                                       |   1 +
 rust/hw/Kconfig                                    |   2 +
 rust/hw/char/Kconfig                               |   3 +
 rust/hw/char/meson.build                           |   1 +
 rust/hw/char/pl011/.gitignore                      |   2 +
 rust/hw/char/pl011/Cargo.lock                      | 134 +++++
 rust/hw/char/pl011/Cargo.toml                      |  26 +
 rust/hw/char/pl011/README.md                       |  31 ++
 rust/hw/char/pl011/meson.build                     |  26 +
 rust/hw/char/pl011/src/definitions.rs              |  20 +
 rust/hw/char/pl011/src/device.rs                   | 600 +++++++++++++++++++++
 rust/hw/char/pl011/src/device_class.rs             |  63 +++
 rust/hw/char/pl011/src/lib.rs                      | 586 ++++++++++++++++++++
 rust/hw/char/pl011/src/memory_ops.rs               |  59 ++
 rust/hw/meson.build                                |   1 +
 rust/meson.build                                   |   4 +
 rust/qemu-api-macros/Cargo.lock                    |  47 ++
 rust/qemu-api-macros/Cargo.toml                    |  25 +
 rust/qemu-api-macros/README.md                     |   1 +
 rust/qemu-api-macros/meson.build                   |  25 +
 rust/qemu-api-macros/src/lib.rs                    |  43 ++
 rust/qemu-api/.gitignore                           |   2 +
 rust/qemu-api/Cargo.lock                           |   7 +
 rust/qemu-api/Cargo.toml                           |  26 +
 rust/qemu-api/README.md                            |  17 +
 rust/qemu-api/build.rs                             |  14 +
 rust/qemu-api/meson.build                          |  24 +
 rust/qemu-api/src/definitions.rs                   | 109 ++++
 rust/qemu-api/src/device_class.rs                  | 128 +++++
 rust/qemu-api/src/lib.rs                           | 154 ++++++
 rust/qemu-api/src/tests.rs                         |  49 ++
 rust/rustfmt.toml                                  |   7 +
 scripts/archive-source.sh                          |   6 +-
 scripts/make-release                               |   5 +-
 scripts/meson-buildoptions.sh                      |   3 +
 scripts/rust/rust_root_crate.sh                    |  13 +
 scripts/rust/rustc_args.py                         |  84 +++
 subprojects/.gitignore                             |  11 +
 subprojects/arbitrary-int-1-rs.wrap                |   7 +
 subprojects/bilge-0.2-rs.wrap                      |   7 +
 subprojects/bilge-impl-0.2-rs.wrap                 |   7 +
 subprojects/either-1-rs.wrap                       |   7 +
 subprojects/itertools-0.11-rs.wrap                 |   7 +
 .../packagefiles/arbitrary-int-1-rs/meson.build    |  19 +
 subprojects/packagefiles/bilge-0.2-rs/meson.build  |  29 +
 .../packagefiles/bilge-impl-0.2-rs/meson.build     |  45 ++
 subprojects/packagefiles/either-1-rs/meson.build   |  24 +
 .../packagefiles/itertools-0.11-rs/meson.build     |  30 ++
 .../packagefiles/proc-macro-error-1-rs/meson.build |  40 ++
 .../proc-macro-error-attr-1-rs/meson.build         |  32 ++
 .../packagefiles/proc-macro2-1-rs/meson.build      |  31 ++
 subprojects/packagefiles/quote-1-rs/meson.build    |  29 +
 subprojects/packagefiles/syn-2-rs/meson.build      |  40 ++
 .../packagefiles/unicode-ident-1-rs/meson.build    |  20 +
 subprojects/proc-macro-error-1-rs.wrap             |   7 +
 subprojects/proc-macro-error-attr-1-rs.wrap        |   7 +
 subprojects/proc-macro2-1-rs.wrap                  |   7 +
 subprojects/quote-1-rs.wrap                        |   7 +
 subprojects/syn-2-rs.wrap                          |   7 +
 subprojects/unicode-ident-1-rs.wrap                |   7 +
 subprojects/unicode-ident-1-rs/meson.build         |  20 +
 tests/lcitool/mappings.yml                         |   2 +-
 76 files changed, 3163 insertions(+), 22 deletions(-)
---
base-commit: a733f37aef3b7d1d33bfe2716af88cdfd67ba64e
change-id: 20240814-rust-pl011-v7

Best regards,