Date: Tue, 09 Sep 2025 19:07:04 +0000 From: Jonathan Vasquez <jon@xyinn.org> To: freebsd-virtualization@freebsd.org Subject: Re: bhyve rw access to host filesystem? Message-ID: <UaUXle1tDZs3111Mg2mbnPCQjx2qa1nUvGQgrcgnCbs5rqWr5cXDkDhfYHbyXfF2q5RJWpefuOzhY65cuFt-qpJq-ysK6C9VXWiuLu0nOVI=@xyinn.org> In-Reply-To: <CAFDf7UKSgkDf3j1amhmNwY3CTGKHNONVahjAQCkH7hBVhTQf9A@mail.gmail.com> References: <aMAjoodDyaJIahJl@int21h> <aMAwFNbSSfKAGh5D@amaryllis.le-fay.org> <CAFDf7UKSgkDf3j1amhmNwY3CTGKHNONVahjAQCkH7hBVhTQf9A@mail.gmail.com>
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[-- Attachment #1 --] Yea definitely. Windows is actually my main use case where I need to share files between the host and guest. Jonathan Vasquez PGP: 34DA 858C 1447 509E C77A D49F FB85 90B7 C4CA 5279 Sent with ProtonMail Secure Email Sent from [Proton Mail](https://proton.me/mail/home) for Android. -------- Original Message -------- On Tuesday, 09/09/25 at 14:34 Nuno Teixeira <eduardo@freebsd.org> wrote: > Hello, > I have have already tried it with a linux (debian) guest and it works fine too. > I'm looking for p9fs support on windows guests but for what I digged, there is no 9p support yet but I also found that microsoft uses it on linux subsystem... > If you know a program that do 9p on windows, please share. > Thanks, > > Lexi Winter <ivy@freebsd.org> escreveu (terça, 9/09/2025 à(s) 14:48): > >> void: >>> I'd like to have one bhyve vm access the bhyve *host's* filesystem >> >> this is what p9fs(4) is for. >> >>> I can't seem to find instructions how to do this, although 9p looks >>> promising, am not sure this can be accessed from the host. >> >> p9fs exports an existing directory tree from the host (similar to the >> NFS server), so the host can always access the files by definition. >> >> to export the filesystem, add a virtio-9p device to bhyve: >> bhyve [...] -s 5:0,virtio-9p,myshare=/some/path,rw >> 'myshare' should be replaced with a descriptive name for the share, >> and change 'rw' to 'ro' to make it read-only. >> >> in the guest, mount the filesystem as normal in /etc/fstab using the >> same share name: >> myshare /myshare p9fs rw 0 0 >> >> note that unlike NFS, this doesn't work automatically for descendent >> mountpoints on the host (e.g., ZFS filesystem hierarchies); instead >> you need to export and mount each child filesystem separately. >> >> this is compatible on both the host and guest side with virtio-9p in >> Linux and other operating systems, but not with the newer version >> which i can't remember the name of (VirtFS?). > > -- > > Nuno Teixeira > FreeBSD UNIX: <eduardo@FreeBSD.org> Web: [https://FreeBSD.org](https://freebsd.org/) [-- Attachment #2 --] <html><head></head><body>Yea definitely. Windows is actually my main use case where I need to share files between the host and guest.<br><br><div class="protonmail_signature_block-user"><div>Jonathan Vasquez<br></div><div>PGP: 34DA 858C 1447 509E C77A D49F FB85 90B7 C4CA 5279<br></div><div>Sent with ProtonMail Secure Email<br></div><div><br></div></div><br><br>Sent from <a target="_blank" href="https://proton.me/mail/home" rel="noreferrer">Proton Mail</a> for Android.<div class="protonmail_quote"><br><br>-------- Original Message --------<br>On Tuesday, 09/09/25 at 14:34 Nuno Teixeira <eduardo@freebsd.org> wrote:<br><blockquote class="protonmail_quote"><div dir="ltr"><div><div><div><div>Hello,<br><br></div>I have have already tried it with a linux (debian) guest and it works fine too.<br></div>I'm looking for p9fs support on windows guests but for what I digged, there is no 9p support yet but I also found that microsoft uses it on linux subsystem...<br><br></div>If you know a program that do 9p on windows, please share.<br><br></div>Thanks,</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Lexi Winter <<a rel="noreferrer">ivy@freebsd.org</a>> escreveu (terça, 9/09/2025 à(s) 14:48):<br></div><blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px solid #ccc; padding-left: 1ex">void:<br> > I'd like to have one bhyve vm access the bhyve *host's* filesystem<br> <br> this is what p9fs(4) is for.<br> <br> > I can't seem to find instructions how to do this, although 9p looks<br> > promising, am not sure this can be accessed from the host.<br> <br> p9fs exports an existing directory tree from the host (similar to the<br> NFS server), so the host can always access the files by definition.<br> <br> to export the filesystem, add a virtio-9p device to bhyve:<br> bhyve [...] -s 5:0,virtio-9p,myshare=/some/path,rw<br> 'myshare' should be replaced with a descriptive name for the share,<br> and change 'rw' to 'ro' to make it read-only.<br> <br> in the guest, mount the filesystem as normal in /etc/fstab using the<br> same share name:<br> myshare /myshare p9fs rw 0 0<br> <br> note that unlike NFS, this doesn't work automatically for descendent<br> mountpoints on the host (e.g., ZFS filesystem hierarchies); instead<br> you need to export and mount each child filesystem separately.<br> <br> this is compatible on both the host and guest side with virtio-9p in<br> Linux and other operating systems, but not with the newer version<br> which i can't remember the name of (VirtFS?).<br> </blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><font color="#888888">Nuno Teixeira</font></div><div><div><font color="#888888"> FreeBSD UNIX: <eduardo@FreeBSD.org> Web: <a href="https://freebsd.org/" rel="noreferrer" target="_blank">https://FreeBSD.org</a><br></font></div></div></div></div>; </blockquote></div> </body></html>help
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