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* rust: introduce a c_str macroPaolo Bonzini2024-11-053-1/+55
| | | | | | | | | This allows CStr constants to be defined easily on Rust 1.63.0, while checking that there are no embedded NULs. c"" literals were only stabilized in Rust 1.77.0. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: use std::os::raw instead of core::ffiPaolo Bonzini2024-11-054-13/+16
| | | | | | | | | | core::ffi::c_* types were introduced in Rust 1.64.0. Use the older types in std::os::raw, which are now aliases of the types in core::ffi. There is no need to compile QEMU as no_std, so this is acceptable as long as we support a version of Debian with Rust 1.63.0. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: add definitions for vmstateManos Pitsidianakis2024-11-053-21/+363
| | | | | | | | | | | | | | | | | | | | | | | Add a new qemu_api module, `vmstate`. Declare a bunch of Rust macros declared that are equivalent in spirit to the C macros in include/migration/vmstate.h. For example the Rust of equivalent of the C macro: VMSTATE_UINT32(field_name, struct_name) is: vmstate_uint32!(field_name, StructName) This breathtaking development will allow us to reach feature parity between the Rust and C pl011 implementations. Extracted from a patch by Manos Pitsidianakis (https://lore.kernel.org/qemu-devel/20241024-rust-round-2-v1-4-051e7a25b978@linaro.org/). Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: provide safe wrapper for MaybeUninit::zeroed()Paolo Bonzini2024-11-053-4/+28
| | | | | | | | | | | | | | MaybeUninit::zeroed() is handy, but it introduces unsafe (and has a pretty heavy syntax in general). Introduce a trait that provides the same functionality while staying within safe Rust. In addition, MaybeUninit::zeroed() is not available as a "const" function until Rust 1.75.0, so this also prepares for having handwritten implementations of the trait until we can assume that version. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: make properties array immutablePaolo Bonzini2024-11-051-34/+8
| | | | | | | | | | | | | | | Now that device_class_set_props() takes a const pointer, the only part of "define_property!" that needs to be non-const is the call to try_into(). This in turn will only break if offset_of returns a value with the most significant bit set (i.e. a struct size that is >=2^31 or >= 2^63, respectively on 32- and 64-bit system), which is impossible. Just use a cast and clean everything up to remove the run-time initialization. This also removes a use of OnceLock, which was only stabilized in 1.70.0. Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: clean up define_property macroPaolo Bonzini2024-11-051-24/+7
| | | | | | | | | Use the "struct update" syntax to initialize most of the fields to zero, and simplify the handmade type-checking of $name. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: cleanup module_init!, use it from #[derive(Object)]Paolo Bonzini2024-11-051-38/+27
| | | | | | | | | | Remove the duplicate code by using the module_init! macro; at the same time, simplify how module_init! is used, by taking inspiration from the implementation of #[derive(Object)]. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: build integration test for the qemu_api cratePaolo Bonzini2024-11-052-52/+0
| | | | | | | | | | | | Adjust the integration test to compile with a subset of QEMU object files, and make it actually create an object of the class it defines. Follow the Rust filesystem conventions, where tests go in tests/ if they use the library in the same way any other code would. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: modernize link_section usage for ELF platformsPaolo Bonzini2024-11-051-4/+10
| | | | | | | | | | | | | | | Some newer ABI implementations do not provide .ctors; and while some linkers rewrite .ctors into .init_array, not all of them do. Use the newer .init_array ABI, which works more reliably, and apply it to all non-Apple, non-Windows platforms. This is similar to how the ctor crate operates; without this change, "#[derive(Object)]" does not work on Fedora 41. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: remove uses of #[no_mangle]Paolo Bonzini2024-11-052-3/+0
| | | | | | | | | | Mangled symbols do not cause any issue; disabling mangling is only useful if C headers reference the Rust function, which is not the case here. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: do not use --no-size_t-is-usizePaolo Bonzini2024-11-051-3/+3
| | | | | | | | | | | This is not necessary and makes it harder to write code that is portable between 32- and 64-bit systems: it adds extra casts even though size_of, align_of or offset_of already return the right type. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* meson: pass rustc_args when building all cratesPaolo Bonzini2024-11-051-4/+6
| | | | | | | | | rustc_args is needed to smooth the difference in warnings between the various versions of rustc. Always include those arguments. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* rust: add crate to expose bindings and interfacesManos Pitsidianakis2024-10-114-0/+440
Add rust/qemu-api, which exposes rust-bindgen generated FFI bindings and provides some declaration macros for symbols visible to the rest of QEMU. Co-authored-by: Junjie Mao <junjie.mao@intel.com> Co-authored-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Junjie Mao <junjie.mao@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Link: https://lore.kernel.org/r/0fb23fbe211761b263aacec03deaf85c0cc39995.1727961605.git.manos.pitsidianakis@linaro.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>