Date: Tue, 10 Feb 2026 07:57:02 +0100 From: Mario Marietto <marietto2008@gmail.com> To: Emil Tsalapatis <emil@etsalapatis.com>, FreeBSD virtualization <freebsd-virtualization@freebsd.org> Subject: Re: RFC: Kernel virtiofs driver Message-ID: <CA%2B1FSijd9Cgr7KAL_pD0ACCr7%2BGTMoXR9zQ=skNVFdkstP6KJA@mail.gmail.com> In-Reply-To: <CABFh=a5HoDOHthe%2BavAAxpb3YN4W3FAGqCysdbyrBbr4Rw7rMg@mail.gmail.com>
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[-- Attachment #1 --] Hello Emil, Inside a FreeBSD guest OS (15.0-RELEASE) I do : kldload virtio_p9fs kldload p9fs_load mount -t p9fs sharename /mnt/host This works for me,I can share files between FreeBSD 15.0 guest and FreeBSD 14.3 host os. So,what's missing in this case and which features you added ? Thanks. On Tue, Feb 10, 2026 at 4:05 AM Emil Tsalapatis <emil@etsalapatis.com> wrote: > Hi everyone, > > I recently finished the virtiofs driver and it is now ready for > review. The device allows for sharing directories between a FreeBSD guest > and a host. > > The driver really is two components: > > 1) The virtio device that sends FUSE tickets to and from the host: D46295 > <https://reviews.freebsd.org/D46295>; > 2) The file system that gets mounted in the guest: D46296 > <https://reviews.freebsd.org/D46296>. > > To test it you need a couple additional fixes/workarounds for FUSE-related > issues. You can grab a working tree here > <https://github.com/etsal/freebsd-src/tree/virtiofs>; or apply diffs D55047 > <https://reviews.freebsd.org/D55047>; and D55046 > <https://reviews.freebsd.org/D55046>. D55046 is a workaround, but still > prevents an assertion failure related to FUSE caching until the underlying > issue is properly fixed on HEAD. > > To use it, make sure you are creating virtiofs device on the host then > from the FreeBSD guest run > > mount -t virtiofs <tag> <mountpoint> > > where <tag> is the name tag you gave to the virtiofs device in the host > VMM. > > Reviews and testing welcome! > > Thanks, > Emil > > > -- Mario. [-- Attachment #2 --] <div dir="ltr"><div class="gmail-group gmail-relative gmail-inline-flex gmail-gap-2 gmail-bg-bg-300 gmail-rounded-xl gmail-pl-2.5 gmail-py-2.5 gmail-break-words gmail-text-text-100 gmail-transition-all gmail-max-w-[75ch] gmail-flex-col gmail-!px-4 gmail-max-w-[85%]" style="opacity:1"><div class="gmail-flex gmail-flex-row gmail-gap-2 gmail-relative"><div class="gmail-flex-1"><div class="gmail-font-large gmail-!font-user-message gmail-grid gmail-grid-cols-1 gmail-gap-2 gmail-py-0.5 gmail-relative" style="max-height:none;overflow:hidden"><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]">Hello Emil,</code></font></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]">Inside a FreeBSD guest OS (15.0-RELEASE) I do :</code></font></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><span><span class="gmail-token gmail-token gmail-assign-left" style="color:rgb(251,173,96)">kldload virtio_p9fs </span></span></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><span><span class="gmail-token gmail-token gmail-assign-left" style="color:rgb(251,173,96)">kldload </span></span><span><span></span><span class="gmail-token gmail-token gmail-assign-left" style="color:rgb(251,173,96)">p9fs_load</span></span></p><p class="gmail-whitespace-pre-wrap gmail-break-words"></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]">mount -t p9fs sharename /mnt/host</code></font></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]"></code></font></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]">This works for me,I can share files between FreeBSD 15.0 guest and FreeBSD 14.3 host os. So,what's missing in this case and which features you added ?</code></font></p><p class="gmail-whitespace-pre-wrap gmail-break-words"><font size="4"><code class="gmail-bg-text-200/5 gmail-border gmail-border-0.5 gmail-border-border-300 gmail-text-danger-000 gmail-whitespace-pre-wrap gmail-rounded-[0.4rem] gmail-px-1 gmail-py-px gmail-text-[0.9rem]">Thanks.</code></font></p></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Feb 10, 2026 at 4:05 AM Emil Tsalapatis <<a href="mailto:emil@etsalapatis.com">emil@etsalapatis.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>Hi everyone,<br><br> I recently finished the virtiofs driver and it is now ready for review. The device allows for sharing directories between a FreeBSD guest and a host.</div><br><div>The driver really is two components:<br><br><div>1) The virtio device that sends FUSE tickets to and from the host: <a href="https://reviews.freebsd.org/D46295" target="_blank">D46295</a></div><div>2) The file system that gets mounted in the guest: <a href="https://reviews.freebsd.org/D46296" target="_blank">D46296</a>.</div></div><div><br></div><div><div>To test it you need a couple additional fixes/workarounds for FUSE-related issues. You can grab a working tree <a href="https://github.com/etsal/freebsd-src/tree/virtiofs" target="_blank">here</a> or apply diffs <a href="https://reviews.freebsd.org/D55047" target="_blank"><span>D55047</span></a><span> and </span><a href="https://reviews.freebsd.org/D55046" target="_blank">D55046</a>. D55046 is a workaround, but still prevents an assertion failure related to FUSE caching until the underlying issue is properly fixed on HEAD. </div><div><br></div><div>To use it, make sure you are creating virtiofs device on the host then from the FreeBSD guest run</div><div><br></div><div>mount -t virtiofs <tag> <mountpoint></div><div><br></div><div>where <tag> is the name tag you gave to the virtiofs device in the host VMM.</div><div><br></div><div>Reviews and testing welcome!</div><div><br></div><div>Thanks,</div><div>Emil</div><div><br></div><br></div></div> </div> </blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature">Mario.<br></div>home | help
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