From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: Re: [PATCH] kvm tools: Boot to host /bin/sh via 9p by default Date: Tue, 09 Aug 2011 23:06:44 +0300 Message-ID: <1312920404.3619.1.camel@lappy> References: <1312904014-3538-1-git-send-email-penberg@kernel.org> <4E41676A.90000@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Pekka Enberg , kvm@vger.kernel.org, Linus Torvalds , Asias He , Cyrill Gorcunov , Ingo Molnar , Prasad Joshi To: Avi Kivity Return-path: Received: from mail-wy0-f174.google.com ([74.125.82.174]:43741 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753145Ab1HIUHp (ORCPT ); Tue, 9 Aug 2011 16:07:45 -0400 Received: by wyg24 with SMTP id 24so246605wyg.19 for ; Tue, 09 Aug 2011 13:07:44 -0700 (PDT) In-Reply-To: <4E41676A.90000@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Tue, 2011-08-09 at 19:59 +0300, Avi Kivity wrote: > On 08/09/2011 06:33 PM, Pekka Enberg wrote: > > This patch updates 'kvm run' to boot to host filesystem via 9p '/bin/sh' by > > default: > > > > $ ./kvm run > > # kvm run -k ../../arch/x86/boot/bzImage -m 320 -c 2 --name guest-3462 > > [ 0.000000] Linux version 3.1.0-rc1+ (penberg@tiger) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #7 SMP PREEMPT Tue Aug 9 16:39:20 EEST 2011 > > [ 0.000000] Command line: notsc noapic noacpi pci=conf1 reboot=k panic=1 console=ttyS0 earlyprintk=serial init=/bin/sh root=/dev/vda rw root=/dev/root rootflags=rw,trans=virtio,version=9p2000.u rootfstype=9p > > > > [snip] > > > > [ 1.803261] VFS: Mounted root (9p filesystem) on device 0:13. > > [ 1.805153] devtmpfs: mounted > > [ 1.808353] Freeing unused kernel memory: 924k freed > > [ 1.810592] Write protecting the kernel read-only data: 12288k > > [ 1.816268] Freeing unused kernel memory: 632k freed > > [ 1.826030] Freeing unused kernel memory: 1448k freed > > sh: cannot set terminal process group (-1): Inappropriate ioctl for device > > sh: no job control in this shell > > sh-4.1# > > > > Most kernels won't have 9p built-in, so how about building a tiny initrd > to load the needed modules? > > btw, I get > > # ./kvm run > # kvm run -k ../../arch/x86/boot/bzImage -m 1728 -c 24 --name guest-10193 > > This is usually the case of missing serial console support in the guest kernel. You can either enable these: CONFIG_SERIAL_8250=y CONFIG_SERIAL_8250_CONSOLE=y Switch to virtio console using '--console virtio', or boot into a graphical console using '--sdl' or '--vnc'. -- Sasha.