On 12/21/20 13:06, Max Reitz wrote: > I can share sshfs through sshfs, so it must be something virtiofs-specific.
Your insight proved crucial to solving the riddle. Chaining sshfs with sshfs made me think that you must have used a normal (non-root) user account on the first remote computer (where you ran the 2nd sshfs command). And that reminded me of the "allow_root" option which I seemed to have read somewhere around the FUSE manuals. So indeed I set up another sshfs mount on my laptop, with my normal UID, and tried to access the mount point from a plain root shell (with virtiofsd completely out of the picture) -- it failed with "Permission denied". :) It's apparently intentional on sshfs's / FUSE's part, to protect the local root user from "remote nastiness injection". Then I re-did the sshfs mount, but with "-o allow_root" this time. The plain root shell can now access the mount point. ... So can virtiofsd :) It's *amazing* to see remote files in the UEFI shell. I never thought "filesystem as a service" could feel this empowering. Thanks, Max! Laszlo
