From nobody Thu Feb 12 04:15:11 2026 X-Original-To: freebsd-virtualization@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fBMQr0JWpz6SCtm for ; Thu, 12 Feb 2026 04:15:16 +0000 (UTC) (envelope-from emil@etsalapatis.com) Received: from mail-qt1-x833.google.com (mail-qt1-x833.google.com [IPv6:2607:f8b0:4864:20::833]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "WR4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4fBMQq4ByDz3KJq for ; Thu, 12 Feb 2026 04:15:15 +0000 (UTC) (envelope-from emil@etsalapatis.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-qt1-x833.google.com with SMTP id d75a77b69052e-505e2e4c35fso24585991cf.3 for ; Wed, 11 Feb 2026 20:15:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=etsalapatis-com.20230601.gappssmtp.com; s=20230601; t=1770869713; x=1771474513; darn=freebsd.org; h=in-reply-to:references:cc:to:from:subject:message-id:date :content-transfer-encoding:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=ht6IvNih9C64M1EbNa1CejJ1Kc8nl3IJ1YKlQUZjrdw=; b=C/u3CXLyqjrxk+fBoxbG7/tZiB9jzmf8WKxg7p3klkC8RLs074mLQ3a5Xey5BSpKyh QQP+3RzWluj8q30s1THdgl2t0qJm45BVhulKqh+KzDSYpSmlsn0RFG45ZRIfOkmBWYqI 3pqvuaqqTnUfU5YJJClw3pNKbgVAhQ7bkZSWYOfKNwaR4iwRL9/55eHvm4TE3uI2znCg Q1D2ecastajoLuIyXNAsFMyNeqLYYYU2S4X10qPkNgeMdv0bwdEtg3U8u4ZQsPSG/Z/W Ddrz1SbQ8y8i/YNIgL2iaH97YU0ZZGggUQosPTxnQC7fBS8xjUzLCNuKyrwzDCzercIN WJxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770869713; x=1771474513; h=in-reply-to:references:cc:to:from:subject:message-id:date :content-transfer-encoding:mime-version:x-gm-gg:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ht6IvNih9C64M1EbNa1CejJ1Kc8nl3IJ1YKlQUZjrdw=; b=lV+xvR38mvd53KbaWOOgQmImCTjk6hksbps7vEVrVN6DNQ+AJDaw1js9nOdlWNDzmT KwUVHAs2One7WPW3b/TobQLDLyLXRMX4XuEeujIGEIJ/BuqW2YW5/JZroxGryQxrdJOV Ohijabk9Shy5bU3tSC+9MwvhI5+brYlEdtQAOTUP7aVVFY9lPLw5OAIoaExld5YFnB3U IJER7gA0f7ZtTaPMEJiHe8evaPGIIxLSTn3BrQ9BxH5S+DtHF9GjAEUc19+NG7JDMjaw 8q2twnJL9rRwfqjPWaUVFEeFqbNNxmonvBUNt5GKApFzs6k82m3Db+HlPnd6Fiwl1omF 0TBw== X-Forwarded-Encrypted: i=1; AJvYcCXQcBw9MkS5kDO93bO0HD5mCMmpPdzJDSmO4yFOuIEubjgoABJYbUFlix8HZeF463GtQFaosDjV/1kUUx/U0KDNSLNIKGmh@freebsd.org X-Gm-Message-State: AOJu0YzxyhTLgDAgqRmWKzFXAegdjulCcklYbrOYeI25EtxvlKzQ0t5r MBLhaZ5GYr3c7pucb8dJFORJ0Oxt3PiavsaqNjzblgDOI/YIsZGjiR1Il9rep7Lt7P72nG+fGlm oMaNANek= X-Gm-Gg: AZuq6aI6A3PPWCBtze2dVqr5dVDFeJYYrfqxhsxjzm6007WM+N6Icy2nJsyi+gpVPJ6 krmgOt1r58mCYeHUH1n7A3NxNr+bh4TYkq2UHsyiBRjYq4520hlEUFn9mNdg1PyvO4msezteXDe t33C2rE+SZbRTx6n/s/uHS6UnhFbNo3Dfp19imY/7UJ/dQLeCjJtODk6QbqZ1QTZRakUXxLkl1N z+pn0+7GwjYp4nT3QwhFj4Q9ew3xBdzU1MPb6PfWySzZX0WMI4hN6UAkUaIN6KBS0EVQs9/A/Rs OBXWd27xdMe2Ptv74r0ekIFeTZaoPvvttRLvVe5VVSE7FSz6tpOrhY2XLBCggoHPnGP7ad5Wojo 1WL6cfAxHGqBrE4VmN2DkfkXPwg7TzvsuIZ+7iorhubNZ2YC02cd6jddYs8C9t2Fo2y59fHgzsq 7wkwj0zr15S2vhyZUicdDtNOk= X-Received: by 2002:ac8:5893:0:b0:501:863a:a881 with SMTP id d75a77b69052e-50694ef3b04mr9881841cf.75.1770869713163; Wed, 11 Feb 2026 20:15:13 -0800 (PST) Received: from localhost ([140.174.219.137]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-506847ef59csm27628751cf.10.2026.02.11.20.15.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Feb 2026 20:15:12 -0800 (PST) List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 11 Feb 2026 23:15:11 -0500 Message-Id: Subject: Re: RFC: Kernel virtiofs driver From: "Emil Tsalapatis" To: "Paul Vixie" Cc: "Pete Wright" , "Mario Marietto" , "FreeBSD virtualization" X-Mailer: aerc 0.20.1 References: <9c3f1865-d47f-4fcf-a34b-866ee727a25b@nomadlogic.org> In-Reply-To: X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US] X-Rspamd-Queue-Id: 4fBMQq4ByDz3KJq X-Spamd-Bar: ---- On Tue Feb 10, 2026 at 11:27 PM EST, Paul Vixie wrote: > Do both p9fs and virtiofs both support mmap() such that two or more guest= s, and the host, can all map a file on the host for read/write access, and = each see writes made by the others? This is my pain point with nfs and smb. > The virtiofs protocol supports this, it was one of its initial selling points. However, I'm planning on implementing the extention after the=20 base driver is merged. So not now but soon, there will be the ability=20 to directly map data directly into the guest and work on it. A nice description of how the protocol actually does the mapping is in the=20 commit for the Linux virtiofs kernel driver: https://lwn.net/Articles/813807/ > Is either one as lightweight as zvol and ufs, such that I could consider = using it for the os? > People have used it as a root mount but I don't have concrete numbers to be honest. I will get some this weekend and get back to you. > I appreciate all the effort both teams have put in. Thank you!=20 > Paul Vixie