From nobody Wed Feb 11 04:27:48 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 UTF8SMTP id 4f9llz2Jczz6RpP8 for ; Wed, 11 Feb 2026 04:27:59 +0000 (UTC) (envelope-from paul@redbarn.org) Received: from util.redbarn.org (util.redbarn.org [24.104.150.222]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.redbarn.org", Issuer "Sectigo Public Server Authentication CA DV R36" (not verified)) by mx1.freebsd.org (Postfix) with UTF8SMTPS id 4f9llz08R4z3Kxj for ; Wed, 11 Feb 2026 04:27:58 +0000 (UTC) (envelope-from paul@redbarn.org) Authentication-Results: mx1.freebsd.org; none Received: from family.redbarn.org (family.redbarn.org [IPv6:2001:559:8000:cd::5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.redbarn.org", Issuer "Sectigo Public Server Authentication CA DV R36" (not verified)) by util.redbarn.org (Postfix) with UTF8SMTPS id 4BDFB160B36; Wed, 11 Feb 2026 04:27:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=redbarn.org; s=util; t=1770784071; bh=yjGOEySJu91sarwX64NAcbuB5DPRkjuFsEPtdeI/ymc=; h=Date:From:To:Cc:In-Reply-To:References:Subject; b=UQxkPXaXHt/wCeP5F1z1Bfef4qOLqylUicJMXzTiD2t30JNfXRdFgiBOk1p5vdrMo IKXXlHyOCObW3iJyTE5TyJT/hRazbzmRqhMilCDAerYCH7G4DxlGyZ4sfg7b6oMAyY MLEjq/xHsO9ilyhdWjIWl5GHjkRE8tiaxBBNHmAA= Received: from dummy.faircode.eu (unknown [12.23.24.162]) (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 did not present a certificate) by family.redbarn.org (Postfix) with UTF8SMTPSA id B7EF019; Wed, 11 Feb 2026 04:27:51 +0000 (UTC) Date: Tue, 10 Feb 2026 22:27:48 -0600 From: Paul Vixie To: Emil Tsalapatis Cc: Pete Wright , Mario Marietto , FreeBSD virtualization Message-ID: In-Reply-To: References: <9c3f1865-d47f-4fcf-a34b-866ee727a25b@nomadlogic.org> Subject: Re: RFC: Kernel virtiofs driver 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-Type: multipart/alternative; boundary="----=_Part_15_177762501.1770784068738" X-Correlation-ID: 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:33651, ipnet:24.104.150.0/24, country:US] X-Rspamd-Queue-Id: 4f9llz08R4z3Kxj X-Spamd-Bar: ---- ------=_Part_15_177762501.1770784068738 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Do both p9fs and virtiofs both support mmap() such that two or more guests, 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. Is either one as lightweight as zvol and ufs, such that I could consider using it for the os? I appreciate all the effort both teams have put in. Paul Vixie ------=_Part_15_177762501.1770784068738 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit Do both p9fs and virtiofs both support mmap() such that two or more guests, 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.

Is either one as lightweight as zvol and ufs, such that I could consider using it for the os?

I appreciate all the effort both teams have put in.
Paul Vixie
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