From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754903AbcESOKT (ORCPT ); Thu, 19 May 2016 10:10:19 -0400 Received: from e19.ny.us.ibm.com ([129.33.205.209]:59585 "EHLO e19.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753971AbcESOKR (ORCPT ); Thu, 19 May 2016 10:10:17 -0400 X-IBM-Helo: d01dlp01.pok.ibm.com X-IBM-MailFrom: paulmck@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org Date: Thu, 19 May 2016 07:10:13 -0700 From: "Paul E. McKenney" To: Josh Triplett Cc: Boqun Feng , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan Subject: Re: [PATCH 3/4] rcutorture: Make -soundhw a x86 specific option Message-ID: <20160519141013.GN3528@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <1463629344-20471-1-git-send-email-boqun.feng@gmail.com> <1463629344-20471-4-git-send-email-boqun.feng@gmail.com> <20160519042309.GA18252@x> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160519042309.GA18252@x> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16051914-0057-0000-0000-0000045D199D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 18, 2016 at 09:23:10PM -0700, Josh Triplett wrote: > On Thu, May 19, 2016 at 11:42:23AM +0800, Boqun Feng wrote: > > The option "-soundhw pcspk" gives me a error on PPC as follow: > > > > qemu-system-ppc64: ISA bus not available for pcspk > > > > , which means this option doesn't work on ppc by default. So simply make > > this an x86-specific option via identify_qemu_args(). > > > > Signed-off-by: Boqun Feng > > The emulated system for RCU testing does not need sound hardware at all. > Paul added this option in commit > 16c77ea7d0f4a74e49009aa2d26c275f7f93de7c to disable the default sound > hardware, saying that '"-soundhw pcspk" makes the script a bit less > dependent on odd audio libraries being installed'. Unfortunately, it > looks like there isn't a "-soundhw none". As far as I can tell, > currently the only way to completely eliminate sound hardware is to pass > "-nodefaults" and then explicitly specify each desired device; while > that would solve the issue, it would likely introduce *more* > hardware-specific command-line options... > > I've filed two feature requests on upstream qemu to make this simpler: > https://bugs.launchpad.net/qemu/+bug/1583420 and > https://bugs.launchpad.net/qemu/+bug/1583421 . > > Paul, what did you mean by "dependent on odd audio libraries"? Did you > mean in the guest or the host? And either way, is this something that > could potentially be solved another way? If I remember correctly, Ubuntu 14.04 qemu refused to run the guest without this option, but I don't recall the exact error message. I chalked it up to my ignorance of qemu, but I would very much welcome some way to not have to specify irrelevant hardware. So thank you very much for filing the bugs! Thanx, Paul