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The SlaveReqHandler should be the sole owner of a VhostUserBackend since it calls its mutable methods, so we shouldn't need an Arc here. If sharing is necessary users can use their own locking mechanism. Single ownership will help to retrieve the backend after a client disconnects, to reuse it for another connection if needed. BUG=b:229554679 BUG=b:216407443 TEST=cargo test -p vmm_vhost TEST=vhost-user console device works. TEST=cargo test -p devices Change-Id: I2358c807ac3ddb1ee4b29d97df0ade5a3e30a85a Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3591108 Commit-Queue: Alexandre Courbot <acourbot@chromium.org> Reviewed-by: Richard Zhang <rizhang@google.com> Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> |
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vHost
A pure rust library for vhost-user. This is a fork of rust-vmm/vhost.
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.