From owner-freebsd-stable@freebsd.org Sat Oct 29 15:32:23 2016 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2B428C258E8 for ; Sat, 29 Oct 2016 15:32:23 +0000 (UTC) (envelope-from freebsd@omnilan.de) Received: from mx0.gentlemail.de (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A5689215 for ; Sat, 29 Oct 2016 15:32:22 +0000 (UTC) (envelope-from freebsd@omnilan.de) Received: from mh0.gentlemail.de (ezra.dcm1.omnilan.net [IPv6:2a00:e10:2800::a135]) by mx0.gentlemail.de (8.14.5/8.14.5) with ESMTP id u9TFWIax020237 for ; Sat, 29 Oct 2016 17:32:18 +0200 (CEST) (envelope-from freebsd@omnilan.de) Received: from titan.inop.mo1.omnilan.net (titan.inop.mo1.omnilan.net [IPv6:2001:a60:f0bb:1::3:1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mh0.gentlemail.de (Postfix) with ESMTPSA id 56EE7B23; Sat, 29 Oct 2016 17:32:18 +0200 (CEST) Message-ID: <5814C101.90805@omnilan.de> Date: Sat, 29 Oct 2016 17:32:17 +0200 From: Harry Schmalzbauer Organization: OmniLAN User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; de-DE; rv:1.9.2.8) Gecko/20100906 Lightning/1.0b2 Thunderbird/3.1.2 MIME-Version: 1.0 To: freebsd-stable@freebsd.org Subject: Re: Unexpected ahci-hd bytes when running in bhyve(8) References: <58124200.5080306@omnilan.de> In-Reply-To: <58124200.5080306@omnilan.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]); Sat, 29 Oct 2016 17:32:18 +0200 (CEST) X-Milter: Spamilter (Reciever: mx0.gentlemail.de; Sender-ip: ; Sender-helo: mh0.gentlemail.de; ) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Oct 2016 15:32:23 -0000 Bezüglich Harry Schmalzbauer's Nachricht vom 27.10.2016 20:05 (localtime): > Hello, > > I wanted to use a "roaming" ssd with byhve/vmm, which is the home of a > GPT based FreeBSD setup. > I've been using this for years with ESXi and bare-metal-hosts, and > wanted to try out bhyve. > Unfortunately this doesn't work the way I'm used to. > Booting of ufs:/dev/gpt/myROOT fails with error 19, loader does only see > a diskid/BHYVEDISK, not the GPT partitions. > > I guess ahci-hd isn't 1:1 mapping blocks, neither does virtio-blk, since > it shows exactly the same result, which is a bit strange to me: > When I boot a Live-CD in vmm with the physical SSD ahci-hd attached, the > first 8kByte of /dev/ada0 is 0x0. > > The same test on the host ('dd if=/dev/ada4 count=16 | hd') shows me > PMBR and GPT content, which I also expected to see in bhyve… > > What am I missing? To verify whether my assumptions might be correct at all, I installed a bhyve guest on a file backed ahci-hd drive (/usr/local/guest.img). The first 448 byte of that file are exactly the same when inspected on the host as the first 448 bytes of /dev/ada4. Inspecting /dev/ada0 inside the guest vmm, I see again the same 448 bytes when /usr/local/guest.img was attached to ahci-hd (-s 7,ahci-hd,/usr/local/guest.img). That was what I expected. What I don't understand is why my expectations are true for /usr/local/guest.img but not for /dev/ada4. Like mentioned, while reading the first 448 bytes on the host, I get identical results from /usr/local/guest.img and /dev/ada4, but when attaching /dev/ada4 to ahci-hd (-s 7,ahci-hd,/dev/ada4) and inspecting inside vmm, all I see is 0x0, while ahci-hd attached /usr/local/guest.img shows the same pmbr as on the host!? Do I have to exclude /dev/ada4 on the host from geom? As soon as bhyve opens /dev/ada4, all partitions vanish from the host – probably ada4 itself gets blocked somehow? Thanks for any hint in advance, -harry