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| kata-dev-irc-bot | <raravena80> fwiw, lots of issues with gVisor. I couldn't even get a hello world running on an AWS instance running Ubuntu 16.04. https://github.com/google/gvisor/issues/24 Lots of other issues reported in the last 24 hours too. | 18:48 |
|---|---|---|
| stefanha | I saw quotes from Kata folks on the gVisor announcement. Have any details of Kata + gVisor integration been announced? | 18:58 |
| kata-dev-irc-bot | <sebastien.boeuf> nothing in scope for now | 18:58 |
| stefanha | gVisor as it is pretty much replaces Kata as OCI runtime, but maybe a new "hypervisor" driver could be added to Kata? | 18:58 |
| stefanha | Then gVisor would be a hypervisor option for Kata | 18:59 |
| kata-dev-irc-bot | <sebastien.boeuf> yes, but the first step would be to evaluate the stability/reliability of gVisor | 18:59 |
| stefanha | I'm interested in performance results, the gVisor website is quite shy about that and it sounds like it might not be so good (the UML and ptrace references especially!). | 18:59 |
| stefanha | In KVM mode it should be quite fast but I'm not sure about the I/O proxying that gVisor does. | 19:00 |
| stefanha | Maybe some (many?) of the syscalls can be handled in guest mode, but vmexit is expensive. | 19:01 |
| kata-dev-irc-bot | <sebastien.boeuf> not sure I understand how passing some devices would fit here, and I don't even think it is actually supported | 19:02 |
| davidgiluk | stefanha: No, it's not obvious how the syscall-thing corresponds to their kvm-thing | 19:04 |
| stefanha | IIUC the idea is to handle the syscalls inside the guest and then have a minimal paravirtualized interface to the host. | 19:04 |
| stefanha | There is a 9P proxy for file system access. | 19:04 |
| stefanha | So I think the file are still on the host - similar to virtio-9p in Kata | 19:04 |
| stefanha | I think they do some /proc emulation inside the guest though | 19:05 |
| kata-dev-irc-bot | <eric.ernst> Yeah, it'll be interesting to learn more. | 19:06 |
| kata-dev-irc-bot | <raravena80> a lot of us went to the gVisor talk at KubeCon, slides are here: https://schd.ws/hosted_files/kccnceu18/47/Container%20Isolation%20at%20Scale.pdf from 15 onwards | 19:07 |
| kata-dev-irc-bot | <eric.ernst> And as mentioned a bit yesterday, good to be able to leverage each other on tackling similar problems in this space (9p, ecosystem embracement of non-namespace based runtimes, etc) | 19:07 |
| stefanha | sebastian.boef: which type of devices are you thinking of? | 19:08 |
| kata-dev-irc-bot | <raravena80> they have a thing called Gofer that does 9p | 19:09 |
| kata-dev-irc-bot | <raravena80> mostly here looks like https://github.com/google/gvisor/tree/797cda301677abc8523d5a2a8d731312cc43bce4/pkg/sentry/fs/gofer | 19:11 |
| kata-dev-irc-bot | <sebastien.boeuf> stefanha: any PCI device that we pass inside the VM with Kata using virtio. How does this apply in gVisor context ? | 19:12 |
| stefanha | "Save/Restore is a first-class citizen" <-- I didn't catch that before! Maybe people will use it just to get checkpoint/restore :) | 19:13 |
| stefanha | sebastien.boeuf: For applications like DPDK that want PCI passthrough (userspace drivers), gVisor would need to have a VFIO interface. | 19:14 |
| stefanha | sebastien.boeuf: For arbitrary devices (e.g. a graphics card) where the application expects to access /dev/* it won't work. | 19:14 |
| stefanha | I doubt gofer is meant for that. Forwarding ioctls is a nightmare (because they are per-driver and a huge attack surface). | 19:15 |
| stefanha | I'm curious now how they implement mmap and page cache. | 19:15 |
| kata-dev-irc-bot | <sebastien.boeuf> thx for the explanation | 19:15 |
| stefanha | Finally sound the kernel :) https://github.com/google/gvisor/blob/master/pkg/sentry/syscalls/linux/sys_mmap.go | 19:22 |
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