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vmsilo fork of vhost rust libraries
48 commits 1 branch 42 tags 997 KiB
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Liu Jiang 6ccc681e7e vhost-user: enlarge supported number of vrings 
Enlarge VHOST_USER_MAX_VRINGS from 0xff to 0x8000, there's devices
needing more vrings than 0xff.

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>
2020-12-14 12:15:40 +01:00
.cargo fix link issues on aarch64 musl 2020-09-04 17:59:53 +03:00
rust-vmm-ci@e58ea7445a Switch to rust-vmm-ci for the CI 2020-09-04 17:59:53 +03:00
src vhost-user: enlarge supported number of vrings 2020-12-14 12:15:40 +01:00
.gitignore Initial commit 2019-04-03 14:38:29 +08:00
.gitmodules Switch to rust-vmm-ci for the CI 2020-09-04 17:59:53 +03:00
Cargo.toml Define communication messages of vhost-user spec 2020-09-04 17:59:53 +03:00
CODEOWNERS CODEOWNERS: Make PullAssigner the default owner 2019-09-10 13:59:28 +08:00
coverage_config_aarch64.json Switch to rust-vmm-ci for the CI 2020-09-04 17:59:53 +03:00
coverage_config_x86_64.json vhost-user: enlarge supported number of vrings 2020-12-14 12:15:40 +01:00
LICENSE Initial commit 2019-04-03 14:38:29 +08:00
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README.md Add license files for BSD-Alibaba, BSD-Google 2020-09-04 17:59:53 +03:00

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.