From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: Re: [PATCH 2/2] kvm tools: Add virtio-9p Date: Thu, 26 May 2011 17:36:47 +0300 Message-ID: <1306420607.3065.20.camel@lappy> References: <1305657337-2584-1-git-send-email-levinsasha928@gmail.com> <1305657337-2584-2-git-send-email-levinsasha928@gmail.com> <20110517184023.GC16689@elte.hu> <1305659307.12150.37.camel@sasha> <1305664052.12150.43.camel@sasha> <1305709505.12150.71.camel@sasha> <4DDE6398.107@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Eric Van Hensbergen , Ingo Molnar , penberg@kernel.org, asias.hejun@gmail.com, prasadjoshi124@gmail.com, gorcunov@gmail.com, kvm@vger.kernel.org To: Venkateswararao Jujjuri Return-path: Received: from mail-ww0-f44.google.com ([74.125.82.44]:48373 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756454Ab1EZOgv (ORCPT ); Thu, 26 May 2011 10:36:51 -0400 Received: by wwa36 with SMTP id 36so843338wwa.1 for ; Thu, 26 May 2011 07:36:50 -0700 (PDT) In-Reply-To: <4DDE6398.107@linux.vnet.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: On Thu, 2011-05-26 at 07:28 -0700, Venkateswararao Jujjuri wrote: > Any progress on this? May I get more detailed instructions on how > you did this trick? Basically booting on 9P/VirtIO. > > Thanks, > JV > Ofcourse. This change didn't go into tools/kvm/ since we only support the legacy 9p2000 protocol at the moment, which means that even though we can boot - it's quite unusable to work with. The trick is pretty simple: You need to name your virtio transport "/dev/root" (I think it's currently named "local" in qemu). Once it's named this way, boot with the following kernel cmdline added: "root=/dev/root rootflags=rw,trans=virtio,version=9p2000 rootfstype=9p rw" (You should be able to change version to one of the 9p2000 extensions). I've noticed that the transport *has* to be named "/dev/root", naming it something else (and adjusting the "root=" parameter) doesn't seem to work. Also, if it's named "/dev/root" I couldn't mount it as a simple filesystem from within a guest - not as root. -- Sasha.