| commit | 488b3adc2f26d150def93949d51cfdd37528a37d | [log] [tgz] |
|---|---|---|
| author | wanglei01 <[email protected]> | Thu Jul 29 11:30:49 2021 +0800 |
| committer | Sergio Lopez <[email protected]> | Thu Jul 29 08:53:15 2021 +0200 |
| tree | 433a2c15bdc57f513bfbb5998b987da21ae5e367 | |
| parent | c1f77c778bc482395bb1f9d0d4961e67f30c83eb [diff] |
fix warning: unaligned_references
fix warning, when compiling with 1.53.0
```
warning: reference to packed field is unaligned
--> src/vhost_user/message.rs:252:53
|
252 | unsafe { std::mem::transmute_copy::<u32, R>(&self.request) }
| ^^^^^^^^^^^^^
|
= note: `#[warn(unaligned_references)]` on by default
= warning: this was previously accepted by the compiler but is being
phased out; it will become a hard error in a future release!
= note: for more information, see issue #82523
<https://github.com/rust-lang/rust/issues/82523>
= note: fields of packed structs are not properly aligned, and
creating a misaligned reference is undefined behavior (even if
that reference is never dereferenced)
```
Signed-off-by: wanglei <[email protected]>
A pure rust library for vDPA, vhost and vhost-user.
The vhost crate aims to help implementing dataplane for virtio backend drivers. It supports three different types of dataplane drivers:
The main relationship among Traits and Structs exported by the vhost crate is as below:
The vhost drivers in Linux provide in-kernel virtio device emulation. Normally the hypervisor userspace process emulates I/O accesses from the guest. Vhost puts virtio emulation code into the kernel, taking hypervisor userspace out of the picture. This allows device emulation code to directly call into kernel subsystems instead of performing system calls from userspace. The hypervisor relies on ioctl based interfaces to control those in-kernel vhost drivers, such as vhost-net, vhost-scsi and vhost-vsock etc.
The vhost-user protocol aims to implement vhost backend drivers in userspace, which complements the ioctl interface used to control the vhost implementation in the Linux kernel. It implements the control plane needed to establish virtqueue sharing with a user space process on the same host. It uses communication over a Unix domain socket to share file descriptors in the ancillary data of the message.
The protocol defines two sides of the communication, master and slave. Master is the application that shares its virtqueues, slave is the consumer of the virtqueues. Master and slave can be either a client (i.e. connecting) or server (listening) in the socket communication.