[kata-dev] [Announce] virtio-fs released with Kata Containers support

Boeuf, Sebastien sebastien.boeuf at intel.com
Fri Dec 14 16:21:12 UTC 2018

This is great news Stefan, thanks for the hard work, everybody is
delighted to see that you've submitted patches for Kata, and the proper
documentation on how to use it!

I'm really interested in understanding the full details of this
solution, and super happy that we now have a good answer to all the
trouble that 9p caused us.

Looking forward to merging this in our Kata codebase soon :)


On Fri, 2018-12-14 at 16:13 +0000, Stefan Hajnoczi wrote:
> [Resend - the original may not have been delivered.]
> Dear Kata Containers Community,
> I'm delighted to announce the first release of virtio-fs, a new
> shared
> file system for virtual machines that is designed for container use
> cases, including shared volumes.
> Unlike virtio-9p and NFS over AF_VSOCK, virtio-fs aims to take
> advantage
> of the co-location between the virtual machine and the hypervisor in
> order to achieve local file system semantics and improve performance.
> For example, it can use Linux Direct Access (DAX) to access file
> contents directly from the host page cache.  This reduces
> communication
> with the file server and avoids duplicating data into each sandbox
> VM.
> It also means that mmap MAP_SHARED on a shared volume is coherent
> between sandbox VMs.
> The Linux kernel code (including performance numbers) has been posted
> here:
> https://marc.info/?l=linux-fsdevel&m=154446243324255&w=2
> Kata Containers integration is already available so you can benchmark
> and test virtio-fs.  The project is under active development and we
> still expect to make significant changes based on feedback and
> collaboration.
> We hope virtio-fs is interesting as a next step in overcoming
> virtio-9p's performance and limitations.  Let us know how it
> performs!
> You can read more about virtio-fs here:
> https://virtio-fs.gitlab.io/
> The Kata HowTo is here:
> https://virtio-fs.gitlab.io/howto-kata.html
> The Kata runtime and agent changes are fairly straightforward and
> comparable to virtio-9p.  There are several other code changes due to
> using a Fedora initramfs, systemd, and modular kernel.  These are not
> essential to virtio-fs but are simply how I preferred to develop and
> test.
> The FAQ on the virtio-fs website explains the main technical
> features.
> Please let me know if you have any questions or need help getting it
> running!  I'm also on #kata-dev IRC if you need a hand.
> Stefan
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