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 :|
