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59958f0a61
cloud-hypervisor/vhost_rs
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Liu Bo 59958f0a61 vhost_user_fs: add the ability to set slave req fd 
This adds the missing part of supporting virtiofs dax on the slave end,
that is, receiving a socket pair fd from the master end to set up a
communication channel for sending setupmapping & removemapping messages.

Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
2020-02-19 07:52:50 +00:00
..
src vhost_user_fs: add the ability to set slave req fd 2020-02-19 07:52:50 +00:00
Cargo.toml vmm: Port to latest vmm-sys-util 2019-12-11 14:11:11 +00:00
LICENSE vhost_rs: Copy vhost crate from jiangliu/v1 2019-06-27 21:46:00 +02:00
LICENSE-BSD vhost_rs: Copy vhost crate from jiangliu/v1 2019-06-27 21:46:00 +02:00
LICENSE-MIT vhost_rs: Copy vhost crate from jiangliu/v1 2019-06-27 21:46:00 +02:00
README.md vhost_rs: Copy vhost crate from jiangliu/v1 2019-06-27 21:46:00 +02:00

README.md

vHost

A crate to support vhost backend drivers for virtio devices.

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 is aiming 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.