werunplugged/unplugged-vendor
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
ebc759d833
unplugged-vendor/external/rust/crates/vmm_vhost
History
ziv-gabel ebc759d833 Initial commit: AOSP 12 vendor with modifications for Unplugged OS
2025-10-06 13:59:42 +00:00
..
.cargo Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
docs Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
src Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
.gitignore Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
.gitmodules Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
Android.bp Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
Cargo.toml Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
CODEOWNERS Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
coverage_config_aarch64.json Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
coverage_config_x86_64.json Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
LICENSE Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
LICENSE-BSD-3-Clause Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
LICENSE-BSD-Chromium Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
METADATA Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
MODULE_LICENSE_APACHE2 Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
OWNERS Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
PRESUBMIT.cfg Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00
README.md Initial commit: AOSP 12 vendor with modifications for Unplugged OS 2025-10-06 13:59:42 +00:00

README.md

vHost

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:

  • vhost: the dataplane is implemented by linux kernel
  • vhost-user: the dataplane is implemented by dedicated vhost-user servers
  • vDPA(vhost DataPath Accelerator): the dataplane is implemented by hardwares

The main relationship among Traits and Structs exported by the vhost crate is as below:

vhost Architecture

Kernel-based vHost Backend Drivers

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.

vHost-user Backend Drivers

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.