[PATCH 00/11] Rust device model patches and misc cleanups

[Manos Pitsidianakis <manos.pitsidianakis@linaro.org>]

Hello everyone, the pathological corrosion of QEMU code continues.

This series expands the device model harness work performed in the
initial Rust work from the previous month. In particular:

- A new derive proc macro, Device, is introduced and the Object derive
  macro is heavily expanded upon. Many hack-like macros and fixups to
  declare FFI code for QEMU to consume were removed and now everything
  is generated by macros in the qemu-api-macros procmacro crate.
- Add support for device migration by allowing device models to declare
  their VMState description, fields, subsections like in C code. This
  should also allow new qemu versions to transparently migrate any VMs
  that used C device models that were afterwards ported to Rust.
- Add a small logging interface in qemu-api crate to allow calling
  qemu_log() and qemu_log_mask() from Rust code.
- Some minor code cleanups in the Rust pl011 device, and also port of
  one fix patch and one log prints addition patch that was added in the
  C pl011.

  In the future if we go forward with rewriting device models in Rust,
  and keep having both of them in-tree while Rust is not required for
  building QEMU, we could alter checkpatch.pl to produce a warning if a
  C device model has changes but the corresponding Rust implementation
  doesn't.

  Code and functionality duplication is not fun, and pl011 was mostly
  done as a proof of concept for a Rust device because of its small
  complexity. As of this moment we have not decided on a policy for how
  to handle these things and it is not in **scope for this patch series
  anyway**.

In the meantime there are lots of TODOs written in my personal notes, my
personal repos, in the QEMU wiki, in mailing list threads. I plan on
consolidating them all in gitlab issues to streamline things and
who-does-what to avoid duplicating work.

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
Manos Pitsidianakis (11):
      Revert "rust: add PL011 device model"
      rust: add PL011 device model
      rust/qemu-api-macros: introduce Device proc macro
      rust: add support for migration in device models
      rust/pl011: move CLK_NAME static to function scope
      rust/pl011: add TYPE_PL011_LUMINARY device
      rust/pl011: move pub callback decl to local scope
      rust/pl011: remove commented out C code
      rust/pl011: Use correct masks for IBRD and FBRD
      rust/qemu-api: add log module
      rust/pl011: log guest/unimp errors

 rust/wrapper.h                                |   1 +
 rust/hw/char/pl011/src/device.rs              | 419 +++++++++++++++++---------
 rust/hw/char/pl011/src/device_class.rs        |  70 -----
 rust/hw/char/pl011/src/lib.rs                 |   2 +-
 rust/qemu-api-macros/src/device.rs            | 370 +++++++++++++++++++++++
 rust/qemu-api-macros/src/lib.rs               |  46 +--
 rust/qemu-api-macros/src/object.rs            | 107 +++++++
 rust/qemu-api-macros/src/symbols.rs           |  57 ++++
 rust/qemu-api-macros/src/utilities.rs         | 152 ++++++++++
 rust/qemu-api-macros/src/vmstate.rs           | 113 +++++++
 rust/qemu-api/meson.build                     |   5 +-
 rust/qemu-api/src/definitions.rs              |  97 ------
 rust/qemu-api/src/device_class.rs             | 128 --------
 rust/qemu-api/src/lib.rs                      |  10 +-
 rust/qemu-api/src/log.rs                      | 140 +++++++++
 rust/qemu-api/src/objects.rs                  |  90 ++++++
 rust/qemu-api/src/tests.rs                    |  49 ---
 rust/qemu-api/src/vmstate.rs                  | 403 +++++++++++++++++++++++++
 subprojects/packagefiles/syn-2-rs/meson.build |   1 +
 19 files changed, 1726 insertions(+), 534 deletions(-)
---
base-commit: 55522f72149fbf95ee3b057f1419da0cad46d0dd
change-id: 20241024-rust-round-2-69fa10c9a0c9

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