From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56992) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKP10-0000xx-Lg for qemu-devel@nongnu.org; Tue, 05 Jul 2016 07:59:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bKP0v-0008Ky-VG for qemu-devel@nongnu.org; Tue, 05 Jul 2016 07:59:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33604) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKP0v-0008Ks-PW for qemu-devel@nongnu.org; Tue, 05 Jul 2016 07:59:41 -0400 Date: Tue, 5 Jul 2016 12:59:37 +0100 From: "Daniel P. Berrange" Message-ID: <20160705115937.GL6553@redhat.com> Reply-To: "Daniel P. Berrange" References: <1467664794-31002-1-git-send-email-kraxel@redhat.com> <20160705080605.GA6553@redhat.com> <1467712848.12358.21.camel@redhat.com> <20160705100711.GJ6553@redhat.com> <06b3f67a-a3e8-021b-6b13-33062bd2d259@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <06b3f67a-a3e8-021b-6b13-33062bd2d259@redhat.com> Subject: Re: [Qemu-devel] [PATCH v2 0/3] seabios: add serial console support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Gerd Hoffmann , seabios@seabios.org, qemu-devel@nongnu.org On Tue, Jul 05, 2016 at 01:45:10PM +0200, Paolo Bonzini wrote: > > > On 05/07/2016 12:07, Daniel P. Berrange wrote: > >> > What the final default behavior will be is not clear yet. Not enabled? > >> > Enabled in case no VGA is present? Enabled unconditionally (simliar to > >> > ovmf)? > > (Bitter) experiance in libvirt has shown us that magically enabling > > things based on whether or not some other feature is enabled leads > > to pain and suffering in the long term. > > > > So from libvirt's POV, we would like an explicit command line flag > > to turn on/off seabios serial console support, with no dependancy > > on whether VGA is present or not. > > With my other proposal, "-machine graphics=no -device sga" should do it. Ok, so that combination would just "do the right thing" and use Seabios built-in serial if available, and fallback to sgabios if not. > However, for libvirt to do this, it should stop using "-nographic" to > disable all display backends, and instead use "-display none". The > advantage is that neither "-display none" nor "-machine graphics=no" do > any magic redirection of the monitor and the serial ports to stdio. > > "-display none" is supported since QEMU 1.0. For old QEMU without > query-command-line-options it can be scraped from help text; for new > QEMU with query-command-line-options it can be treated as always there. Sure, switching to -display none instead of -nographic is no problem at all. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|