Is the use-case here really related to that of block storage? I imagine a given pool of blocks is reserved for one of VM at a time. I wouldn't want to share th

Is the use-case here really related to that of block storage? I imagine a given pool of blocks is reserved for one of VM at a time. I wouldn't want to share the storage live between two VMs unless it was being accessed by some application specifically designed to hit a shared block store. The point of something like virtio-fs would be to allow multiple VMs to share a file tree. It is a compromise between bind mounds (which are simpler, but only work for containers) and network filesystems (which work remotely, but are less efficient and well behaved).