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# kvm-bindings
Rust FFI bindings to KVM, generated using
[bindgen](https://crates.io/crates/bindgen). It currently has support for the
following target architectures:
- x86_64
- arm64
- riscv64

The bindings exported by this crate are statically generated using header files
associated with a specific kernel version, and are not automatically synced with
the kernel version running on a particular host. The user must ensure that
specific structures, members, or constants are supported and valid for the
kernel version they are using. For example, the `immediate_exit` field from the
`kvm_run` structure is only meaningful if the `KVM_CAP_IMMEDIATE_EXIT`
capability is available. Using invalid fields or features may lead to undefined
behaviour.

### Flexible Array Members (FAM structs)

This crate optionally offers safe wrappers over FAM structs - FFI structs that
have a Flexible Array Member in their definition.  These safe wrappers can be
used if the `fam-wrappers` feature is enabled for this crate. Note that
enabling the `fam-wrappers` feature enables the `vmm-sys-util` dependency.

## Serialization

It has an optional dependency on [`serde`](serde.rs) when enabling the 
`serde` feature, to allow serialization of bindings. Serialization of
bindings happens as opaque binary blobs via [`zerocopy`](https://google.github.io/comprehensive-rust/bare-metal/useful-crates/zerocopy.html).
Due to the kernel's ABI compatibility, this means that bindings serialized
in version `x` of `kvm-bindings` can be deserialized in version `y` of the
crate, even if the bindings have had been regenerated in the meantime.

## Regenerating Bindings

Please see [`CONTRIBUTING.md`](CONTRIBUTING.md) for details on how to generate the bindings
or add support for new architectures.
