Date: Tue, 9 Sep 2025 19:34:09 +0100 From: Nuno Teixeira <eduardo@freebsd.org> To: freebsd-virtualization@freebsd.org Subject: Re: bhyve rw access to host filesystem? Message-ID: <CAFDf7UKSgkDf3j1amhmNwY3CTGKHNONVahjAQCkH7hBVhTQf9A@mail.gmail.com> In-Reply-To: <aMAwFNbSSfKAGh5D@amaryllis.le-fay.org> References: <aMAjoodDyaJIahJl@int21h> <aMAwFNbSSfKAGh5D@amaryllis.le-fay.org>
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[-- Attachment #1 --] 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 [-- Attachment #2 --] <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 href="mailto:ivy@freebsd.org">ivy@freebsd.org</a>> escreveu (terça, 9/09/2025 à(s) 14:48):<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);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>;
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