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If microsoft implemented the host side of virtio-fs then the guest could make use of that.

Also, IO performance of WSL1 wasn't exactly great either compared to native linux filesystems.

Here's an excellent post by SvenGroot from MS with lots of background-info: https://github.com/microsoft/WSL/issues/4197#issuecomment-60...

The most useful bits are always buried deep down in the threads. Thanks for posting this.

Apparently[1] virtio-fs wasn't mainlined in Linux until 5.4, which was rolled last November. I thought it had been mainlined years ago. That helps to explain why support is lacking everywhere.

[1] https://kernelnewbies.org/Linux_5.4

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