Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932498Ab2JUSKm (ORCPT ); Sun, 21 Oct 2012 14:10:42 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:42179 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932461Ab2JUSKg (ORCPT ); Sun, 21 Oct 2012 14:10:36 -0400 Date: Sun, 21 Oct 2012 20:10:31 +0200 From: Ingo Molnar To: Markus Trippelsdorf Cc: Borislav Petkov , richard -rw- weinberger , Christoph Hellwig , Dave Airlie , Stephen Rothwell , Pekka Enberg , Linus Torvalds , Andrew Morton , Avi Kivity , linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] Linux KVM tool for v3.7-rc0 Message-ID: <20121021181031.GB4465@gmail.com> References: <20121021110329.GA7024@infradead.org> <20121021125933.GC19535@gmail.com> <20121021150305.GA26108@gmail.com> <20121021171543.GC20642@liondog.tnic> <20121021174041.GA240@x4> <20121021175108.GA3820@gmail.com> <20121021175422.GB240@x4> <20121021180458.GC240@x4> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20121021180458.GC240@x4> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2889 Lines: 69 * Markus Trippelsdorf wrote: > On 2012.10.21 at 19:54 +0200, Markus Trippelsdorf wrote: > > On 2012.10.21 at 19:51 +0200, Ingo Molnar wrote: > > > > > > * Markus Trippelsdorf wrote: > > > > > > > On 2012.10.21 at 19:15 +0200, Borislav Petkov wrote: > > > > > On Sun, Oct 21, 2012 at 05:03:05PM +0200, Ingo Molnar wrote: > > > > > > The best way to compare them would be a script that gives exactly the > > > > > > same test environment that 'vm run' / 'vm sandbox' does out of box, > > > > > > but using qemu. > > > > > > > > > > > > If such a script is available then that would certainly be a useful > > > > > > testing option to kernel developers. > > > > > > > > > > Right, > > > > > > > > > > I gotta say, I've mucked around with qemu/kvm net options as a novice > > > > > user and haven't always been successfu. If you get host networking > > > > > straight away in lkvm then that's another clear point for tools/kvm. > > > > > > > > > > Same holds true for copying data back and forth between host and guest. > > > > > > > > I'm agnostic about lkvm, but the following command does all the above: > > > > > > > > qemu-system-x86_64 -enable-kvm -net nic,vlan=0,model=virtio > > > > -net user -fsdev > > > > local,security_model=passthrough,id=root,path=/ -device > > > > virtio-9p-pci,id=root,fsdev=root,mount_tag=/dev/root -m 512 > > > > -smp 2 -kernel /usr/src/linux/arch/x86/boot/bzImage -nographic > > > > -append "init=/bin/zsh root=/dev/root console=ttyS0 > > > > kgdboc=ttyS0 rootflags=rw,trans=virtio rootfstype=9p ip=dhcp" > > > > > > > > If you want your host root-fs to be mounted rw (to copy data > > > > back and forth) you need to run to above as root and add "rw" > > > > to the kernel options. > > > > > > Why does it have to run as root? I run 'vm' unprivileged (other > > > than /dev/kvm access). > > > > From the qemu man page: > > > > security_model=security_model > > > > Specifies the security model to be used for this export > > path. Supported security models are "passthrough", "mapped- > > xattr", "mapped-file" and "none". In "passthrough" security > > model, files are stored using the same credentials as they > > are created on the guest. This requires QEMU to run as root. > > But you can use security_model=none as an unprivileged user. > With this option you can only change files for which you have > permission (like in your home directory). That's very much desired for testing anyway. Ok, looks useful - will someone on the Qemu side script this up and integrate it into the kernel in a useful form? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/