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50181346e6
Current implementation does not allow hot-resizing feature to be used in vhost-user block devices because the backend device cannot notify the frontend that the device configuration has changed. Fix this by adding and establishing the backend to frontend vhost-user message connection to the vhost-user block backend, send the HANDLE_CONFIG_CHANGE_MSG to the frontend, and send interrupt to the guest kernel from the frontend device when receiving the message. BUG=b:191845881 TEST=cargo run devices -s /path/to/socket.sock --block ... cargo run run --vhost-user-blk /path/to/vhost-sock, cargo run disk resize 0 $SIZE /path/to/socket.sock Change-Id: Ifab75d65c429dfcea5e632b899f014278a6e6750 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3859218 Commit-Queue: Keita Suzuki <suzukikeita@google.com> Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org> Reviewed-by: Morg <morg@chromium.org> |
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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.