[Virtio-fs] Mount several mount tags in Windows using VirtioFS

[Gal Hammer]

Hi Jonas,

On Tue, 3 Nov 2020 at 18:15, Jonas Andradas <j.andradas at gmail.com> wrote:

> Hello,
>
> TL;DR - Is there a way to mount more than one filesystem from a Linux host
> inside a Windows guest using VirtioFS?
>

TL;DR No.

I didn't implement (yet?) the code to track all the instances of PCI
devices and mount a folder or a drive for each one.

I have a Windows guest running on a Linux host, and I wanted to share
> several directories from the host inside the guest using VirtioFS.
>
> I followed the instructions I found in several places [1][2][3], and have
> installed the VirtioFS drivers and WinFPS. I first tried with one
> filesystem, and I can mount it and browse it fine.
>
> I then configured my Windows guest XML definition so it has 2
> 'filesystems' to, each with its own mount_tag (e.g. 'software' for
> '/home/user/software' and 'documents' for '/home/user/documents').  Windows
> shows 2 "Virtio FS Devices" in the device manager, so this looks promising.
>
> However, when I run 'virtiofs.exe' within Windows (or the service [1]
> suggests starts), I get a "Z:" mount (or whichever letter I specify with
> '-m <DRIVE>') with the first filesystem I specified ('software' in the
> example above).  If I then run 'virtiofs.exe' for a second time, I get a
> new mount (e.g. Y:), but with the same filesystem ('software', and not
> 'documents').
>
> I tried adding the mount_tag to the virtiofs.exe command line, or even
> the PCI path Windows sees the devices on, but this fails (understandably
> so, since the help does not indicate how to specify which filesystem should
> be mounted).
>
> My question was whether (and if so, how) it is actually possible to mount
> more than one directory from the host inside a Windows guest using VirtioFS
> (as can be done in Linux guests).
>
> [1] https://virtio-fs.gitlab.io/howto-windows.html
> [2]
> https://github.com/virtio-win/kvm-guest-drivers-windows/issues/126#issuecomment-667432487
> [3]
> https://www.reddit.com/r/VFIO/comments/i12uyn/virtiofs_is_amazing_plus_how_i_set_it_up/g12o5qt/
>
> Thank you very much in advance,
>
> --
> Jonás Andradas
>
>
    Gal.
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