rust: qemu-api: add bindings to Error

Provide an implementation of std::error::Error that bridges the Rust
anyhow::Error and std::panic::Location types with QEMU's Error*.

It also has several utility methods, analogous to error_propagate(),
that convert a Result into a return value + Error** pair.  One important
difference is that these propagation methods *panic* if *errp is NULL,
unlike error_propagate() which eats subsequent errors[1].  The reason
for this is that in C you have an error_set*() call at the site where
the error is created, and calls to error_propagate() are relatively rare.

In Rust instead, even though these functions do "propagate" a
qemu_api::Error into a C Error**, there is no error_setg() anywhere that
could check for non-NULL errp and call abort().  error_propagate()'s
behavior of ignoring subsequent errors is generally considered weird,
and there would be a bigger risk of triggering it from Rust code.

[1] This is actually a violation of the preconditions of error_propagate(),
    so it should not happen.  But you never know...

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/rust/qemu-api/src/lib.rs b/rust/qemu-api/src/lib.rs
index 234a94e3c2..93902fc94b 100644
--- a/rust/qemu-api/src/lib.rs
+++ b/rust/qemu-api/src/lib.rs
@@ -19,6 +19,7 @@ pub mod callbacks;
 pub mod cell;
 pub mod chardev;
 pub mod errno;
+pub mod error;
 pub mod irq;
 pub mod memory;
 pub mod module;
@@ -34,6 +35,8 @@ use std::{
     ffi::c_void,
 };
 
+pub use error::{Error, Result};
+
 #[cfg(HAVE_GLIB_WITH_ALIGNED_ALLOC)]
 extern "C" {
     fn g_aligned_alloc0(