2021-08-05 Project Stratos Sync Meeting notes
@Ruchika Gupta (Deactivated)
[Mike] What direction should we take in the next cycle ?
[Mike] updating Fixed versions
[Mike] Updating Jira - people do want the updates - Akaskis finds the especially helpful with the timezone issue
Rust implementation discussion,
multiplexing multiple VMs do yu need multiple daemons. For stability, you may want to N to N vs 1 to N backends.
What is the plan for vhost-user backend mutability
Compiling but not working, engineer context switching slowing things down
The issue with alternate implementation, everyone discussing Vireshes code, had a call between Arnd and Viresh. Atomicity is still a question - virito is blocking, gpio driver may sleep and most are not set up this way. Inside kernel 90% can only use non blocking. Plan to follow on with proposal for all virtquesue.
95% done, rate limiting is there, multithreaded, no guest can overwhelm the host. The termination is not working as desired yet, clean up is not happening, when a guest exists the daemon does not listen and reconnects fail
Alex - is this s only when the guest stops, yes, but VMs may want to use the daemon. vhost user rust is not cleaning up.
Arnd assume it is not a design issue ? Mathieu viresh is using traits and I am not. Perhaps my lack of sync trait.
Alex, join RustVMM slack channel, usually a good place to ask questions
I2C - waiting for upstream comments, implementation looks clean. I2C maintainer wants a pull request
Ruchika - found an error in the spec that does not allow multi block reads, patch sent
implementing multiblock for op-tee, trying to get rust version working
Added cards to RPMB task, will have to do a kernel interface, used ACRN tree which worked which was not in an upstream state LKML rejected a proposal but Intel have not posted an expected
What direction should we take in the next cycle
Propose we follow Linaro Stratos cycles - Mathieu, Alex
Need to have a plan agreed by the members so that we can start on October 1st
Matt we can look at aligning with SOAFEE, mid September, virtual event, Kracken launch desktop Altra - automotive with safety island, NXP
Wei Chen email - to KVM tools mailing list highlighted the problem, they wanted to add Xen to KVM tools. This issue was interesting, io_req was the easy bit. He identified code that needs adding all over virtio, that is difficult. Two ideas - 1. library does not solve adding code to KVM tools, 2. using virito then there is still an issue with injecting interrupts.
Fell unfortunate they will need to fork the code to have a KVMtool binary for the backend
Alex is anyone looking at rust-vmm crates in Xen project, three groups active in RustVMM spec
Alex needs the tires kicking on the proposal. Steffano, the back end feels easier, just need an API, adding backend is harder. Memory mapping on interrupts might be harder.
Alex, does kernel have the ability to not write to areas, Arnd yes DT can mark areas, Steffano, there is work on a patch to map other VMs memory. Arnd, there is work to remove struct pages, think there are patches and folio patches Mark Wilcocks.
Alex is this related to hugepages are backed by a struct page, hugepages are better with TLB
Alex if you have a hole, won't there be a page in between? Arnd IO pages don't need them.