January 2019 - Rust-vmm - lists.opendev.org

Goals for this list
by Liguori, Anthony 26 Feb '19

26 Feb '19

Hi! Very excited about this list and eager to begin discussions. I wanted to start with what I see as the low hanging fruit and I what I see as the goal of this effort. I'd like to build a set of crates, preferrably with a common name, that make it really easy to write VMMs in Rust. I think Rust is an ideal language for building VMMs and that if the right primitives are there, a lot of interesting VMMs will emerge. Some ideas I have for what would make good core creates: 1) KVM bindgen bindings. Right now, there is an issue with bindgen misgenerating code when encountering empty trailing arrays which are used in KVM. Both crosvm and Firecracker get around this by modifying the headers by hand and then committing the results of bindgen. Dylan also mentioned that they were unhappy about bindgen performance but this seems like an eventual optimization to me. As a side note, I think having OS X hypervisor framework bindings and whatever the new Windows thing is would be pretty cool. Maybe there's room for a wrapper around the three but it's not something that interesting to me in the near term. 2) The crosvm data_model crate. This one is super critical but easy to misunderstand as it allows for safe access to volatile memory. Somewhat related is the mmap() bits from sys_util. Not sure how the crosvm folks feel but I think there is some refactoring here that could be useful to build a memory crate. 3) Some traits for device model implementations. It's easy to really bike shed here so I reckon it's best to start with a concrete device model like a UART, work through what is required for interfaces, and then iterate from there. 4) Common device models with only a single implementation (i.e. 16650A). Not sure about virtio, maybe. Curious what other people think here too. I've got a couple weeks off coming up so I'd love to have some projects to have on here. Regards, Anthony Liguori

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Schedule Bi-Weekly Calls
by Claire Massey 05 Feb '19

05 Feb '19

Hi everyone, There’s some interest in holding bi-weekly calls to maximize opportunity for collaboration around Rust-VMM topics and discuss project activities that are in flight. Please take this poll to find a time that works best for everyone: https://framadate.org/1corf6IQFWCGZrmT We plan to start hosting the calls next week, in February. Thanks, Claire

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[RFC, WIP] rust implementation of ghost-user protocol
by Liu Jiang 04 Feb '19

04 Feb '19

Hi all, As we have discussed, community members have showed interests in rust implementation of the ghost-user protocol. It happens that we are working on implementing ghost-user protocol, but still in very early stage. I think it would be better to share our work with community as early as possible so we could cooperate on the design and implementation. The overall idea is to implement a rust crate for vhost-user protocol, and then extends the vhost driver in crosvm/firecracker to add a thin wrapper support both vhost (kernel) and vhost-user backends. The crate is in very early stage which only implements the skeleton and basic commands, so a long todo list: 1) support dirty page log 2) support live migration 3) support IOMMU/IOTLB 4) better documentation 5) more unit test cases I have hosted the crate at my personal GitHub repository at https://github.com/jiangliu/vhostuser_rs <https://github.com/jiangliu/vhostuser_rs> and hope it could be hosted by the rust-vmm project eventually. Any comments, suggestions and PRs are welcomed! Thanks, Gerry

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Invitation: Rust-VMM Bi-Weekly Community Mtg @ Every 2 weeks from 10am to 11am on Wednesday from Wed Feb 6 to Wed Dec 18 (CST) (rust-vmm@lists.opendev.org)
by claire＠openstack.org 29 Jan '19

29 Jan '19

You have been invited to the following event. Title: Rust-VMM Bi-Weekly Community Mtg Notes / Agenda: https://etherpad.openstack.org/p/rust_vmm_2019_biweekly_calls Join Zoom Meeting https://zoom.us/j/181523033 One tap mobile +16699006833,,181523033# US (San Jose) +16468769923,,181523033# US (New York) Dial by your location +1 669 900 6833 US (San Jose) +1 646 876 9923 US (New York) Meeting ID: 181 523 033 Find your local number: https://zoom.us/u/abOe7d3zx9 When: Every 2 weeks from 10am to 11am on Wednesday from Wed Feb 6 to Wed Dec 18 Central Time - Chicago Calendar: rust-vmm(a)lists.opendev.org Who: * claire(a)openstack.org - organizer * rust-vmm(a)lists.opendev.org Event details: https://www.google.com/calendar/event?action=VIEW&eid=Xzg5MTNhYzlqOHAxazJiO… Invitation from Google Calendar: https://www.google.com/calendar/ You are receiving this courtesy email at the account rust-vmm(a)lists.opendev.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively you can sign up for a Google account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to modify your RSVP response. Learn more at https://support.google.com/calendar/answer/37135#forwarding

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Last call for GSoC/Outreachy project ideas
by Stefan Hajnoczi 28 Jan '19

28 Jan '19

Dear QEMU, KVM, Jailhouse, and Rust-VMM communities, Please post your internship project ideas by February 1st so we can include them in the Google Summer of Code and Outreachy ideas list: https://wiki.qemu.org/Google_Summer_of_Code_2019 If you'd like to mentor but don't have your own project idea, take a look at the list and ask to co-mentor one of the existing project ideas. Good project ideas are suitable for 12 weeks of full-time work by a competent programmer who is not yet familiar with the codebase. In addition, they are: * Well-defined - the scope is clear * Self-contained - there are few dependencies * Uncontroversial - they are acceptable to the community * Incremental - they produce deliverables along the way For more background on QEMU internships, check out this video: https://www.youtube.com/watch?v=xNVCX7YMUL8 Please let me know if you have any questions. Stefan

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rust-vmm contributors
by Florescu, Andreea 28 Jan '19

28 Jan '19

Hey, I will give a presentation about rust-vmm at Fosdem 2019 (on Saturday) and I will have a slide with people that already contributed to rust-vmm. By contributing I mean: discussions, reviews, pull requests, ideas, others? As it is a bit too much to include individual people, I was thinking about including group of peoples. So far I have (in alphabetical order): Alibaba Cloud Chromium OS Firecracker Kata Containers Qemu Red Hat If I am missing some group, can you please send me an email and I will update the slide? Thanks, Andreea Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.

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Firecracker & Crosvm common crates
by Florescu, Andreea 25 Jan '19

25 Jan '19

Hey everyone, I've created a gist [1] so we can start a discussion about what would be worth contributing back to Crosvm. The document is far from being completed, but I think it is a good idea to get feedback as early as possible. That gist can also be a starting point for talking about crates that can be shared between the teams (and potentially other rust VMMs). Let me know what you think. Thanks and happy holidays, Andreea [1] https://gist.github.com/andreeaflorescu/ce4190b442dea2c48a0d783019579ad3 Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.

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Crate for vhost-user device backend?
by Stefan Hajnoczi 20 Jan '19

20 Jan '19

Hi, Has anyone implemented a vhost-user device backend in Rust? QEMU's libvhost-user and DPDK's librte_vhost are C implementations that provide a device backend API. They allow you to implement vhost-user-net, vhost-user-blk, and vhost-user-scsi devices as a separate process from the main emulator. Stefan

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Summer of Code / Outreachy projects
by Paolo Bonzini 18 Jan '19

18 Jan '19

QEMU would be glad to host projects related to VMMs in Rust as part of Google summer of Code and Outreachy. This includes all of Firecracker, CrosVM and common infrastructure that could be reused by multiple virtual machine monitors; with my QEMU hat, I would obviously favor the latter :)). An idea could be to migrate Firecracker and CrosVM to the Fuchsia crates that were mentioned early here on the mailing list, and/or implement a sample vhost-user client using whatever standard set of crates are established. Another possibility is PCI and virtio-pci in Firecracker. Thanks, Paolo

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rust-vmm slack channel
by Florescu, Andreea 18 Jan '19

18 Jan '19

Heya, I created a rust-vmm Slack workspace! You can join it by following the URL: https://join.slack.com/t/rust-vmm/shared_invite/enQtNTI3NDM2NjA5MzMzLTJiZjU… Andreea Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.

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