On Tue, Mar 30, 2021 at 2:50 AM Eric Ernst <eric.g.ernst@gmail.com> wrote:
Ya'll,

I'd like to see if we can create a pattern in upstream Kata Containers to help facilitate directly assigning volumes to the VM via virtio-blk, skipping any mounts on the host, and avoiding needing to use a shared file-system for the particular volume. Some of the benefits in doing this:
 - we can better isolate the host (no mounted filesystem),
 - more efficient and much faster data path that non-dax virtiofs.
 - avoid inode caching/memory overheads of virtiofs on the host.

In Kubernetes today, there is not a direct communication channel between CSI and the runtime. To make this work on a shorter timeline, therefore, we need to come up with a less traditional way to communicate between the user, CSI and the runtime. I have a proposal in place that "works" today, and I'd like to get feedback on how to improve it, and see if it could be a good fit for upstream. Please see: the proposal at [1], and the PR associated with that proposal at [2].

I'm not an expert here, but why not use raw block rather than adding the annotation skip-hostmount 
https://kubernetes.io/blog/2019/03/07/raw-block-volume-support-to-beta/

+Orit Wasserman 

Thanks,
Amnon

 

Please let me know if you:
  - have any suggestions on the pattern
  - you are a user that would find this pattern helpful for their use-cases

Thanks,
Eric


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