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09c98cb5fe
Bumps the rust-vmm group with 4 updates in the / directory: [vhost](https://github.com/rust-vmm/vhost), [vhost-user-backend](https://github.com/rust-vmm/vhost), [virtio-queue](https://github.com/rust-vmm/vm-virtio) and [vm-memory](https://github.com/rust-vmm/vm-memory). Updates `vhost` from 0.11.0 to 0.13.0 - [Release notes](https://github.com/rust-vmm/vhost/releases) - [Commits](https://github.com/rust-vmm/vhost/compare/vhost-v0.11.0...vhost-v0.13.0) Updates `vhost-user-backend` from 0.15.0 to 0.17.0 - [Release notes](https://github.com/rust-vmm/vhost/releases) - [Commits](https://github.com/rust-vmm/vhost/compare/vhost-user-backend-v0.15.0...vhost-user-backend-v0.17.0) Updates `virtio-queue` from 0.12.0 to 0.14.0 - [Release notes](https://github.com/rust-vmm/vm-virtio/releases) - [Commits](https://github.com/rust-vmm/vm-virtio/compare/virtio-queue-v0.12.0...virtio-queue-v0.14.0) Updates `vm-memory` from 0.14.1 to 0.16.1 - [Release notes](https://github.com/rust-vmm/vm-memory/releases) - [Changelog](https://github.com/rust-vmm/vm-memory/blob/main/CHANGELOG.md) - [Commits](https://github.com/rust-vmm/vm-memory/compare/v0.14.1...v0.16.1) --- updated-dependencies: - dependency-name: vhost dependency-type: direct:production update-type: version-update:semver-minor dependency-group: rust-vmm - dependency-name: vhost-user-backend dependency-type: direct:production update-type: version-update:semver-minor dependency-group: rust-vmm - dependency-name: virtio-queue dependency-type: direct:production update-type: version-update:semver-minor dependency-group: rust-vmm - dependency-name: vm-memory dependency-type: direct:production update-type: version-update:semver-minor dependency-group: rust-vmm ... Signed-off-by: dependabot[bot] <support@github.com> |
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| .. | ||
| src | ||
| test | ||
| ARCHITECTURE.md | ||
| Cargo.toml | ||
| CHANGELOG.md | ||
| LICENSE-APACHE | ||
| LICENSE-BSD-3-Clause | ||
| README.md | ||
vhost-device-scsi
This is a Rust implementation of a vhost-device-scsi daemon.
Usage
Run the vhost-device-scsi daemon:
vhost-device-scsi -r --socket-path /tmp/vhost-user-scsi.sock /path/to/image.raw /path/to/second-image.raw ...
Run QEMU:
qemu-system-x86_64 ... \
-device vhost-user-scsi-pci,num_queues=1,param_change=off,chardev=vus \
-chardev socket,id=vus,path=/tmp/vhost-user-scsi.sock \
# must match total guest meory
-object memory-backend-memfd,id=mem,size=384M,share=on \
-numa node,memdev=mem
Limitations
We are currently only supporting a single request queue and do not support dynamic reconfiguration of LUN parameters (VIRTIO_SCSI_F_CHANGE).
Features
This crate is a work-in-progress. Currently, it's possible to mount and read up to 256 read-only raw disk images. Some features we might like to add at some point, roughly ordered from sooner to later:
- Write support. This should just be a matter of implementing the WRITE command, but there's a bit of complexity around writeback caching we need to make sure we get right.
- Support more LUNs. virtio-scsi supports up to 16384 LUNs per target. After 256, the LUN encoding format is different; it's nothing too complicated, but I haven't gotten around to implementing it.
- Concurrency. Currently, we process SCSI commands one at a time. Eventually, it'd be a good idea to use threads or some fancy async/io_uring stuff to concurrently handle multiple commands. virtio-scsi also allows for multiple request queues, allowing the guest to submit requests from multiple cores in parallel; we should support that.
- iSCSI passthrough. This shouldn't be too bad, but it might be a good idea to decide on a concurrency model (threads or async) before we spend too much time here.