Re: [PATCH v2 2/2] rust: add bindings for interrupt sources

[Zhao Liu <zhao1.liu@intel.com>]

On Mon, Dec 02, 2024 at 12:06:09PM +0100, Paolo Bonzini wrote:
> Date: Mon,  2 Dec 2024 12:06:09 +0100
> From: Paolo Bonzini <pbonzini@redhat.com>
> Subject: [PATCH v2 2/2] rust: add bindings for interrupt sources
> X-Mailer: git-send-email 2.47.0
> 
> The InterruptSource bindings let us call qemu_set_irq() and sysbus_init_irq()
> as safe code.
> 
> Interrupt sources, qemu_irq in C code, are pointers to IRQState objects.
> They are QOM link properties and can be written to outside the control
> of the device (i.e. from a shared reference); therefore they must be
> interior-mutable in Rust.  Since thread-safety is provided by the BQL,
> what we want here is the newly-introduced BqlCell.  A pointer to the
> contents of the BqlCell (an IRQState**, or equivalently qemu_irq*)
> is then passed to the C sysbus_init_irq function.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  rust/hw/char/pl011/src/device.rs | 22 ++++----
>  rust/qemu-api/meson.build        |  2 +
>  rust/qemu-api/src/irq.rs         | 91 ++++++++++++++++++++++++++++++++
>  rust/qemu-api/src/lib.rs         |  2 +
>  rust/qemu-api/src/sysbus.rs      | 26 +++++++++
>  5 files changed, 133 insertions(+), 10 deletions(-)
>  create mode 100644 rust/qemu-api/src/irq.rs
>  create mode 100644 rust/qemu-api/src/sysbus.rs
> 

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>