From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40097) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5EO9-00035F-9E for qemu-devel@nongnu.org; Wed, 17 Jun 2015 10:32:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z5EO8-0002QZ-8X for qemu-devel@nongnu.org; Wed, 17 Jun 2015 10:32:25 -0400 Received: from hall.aurel32.net ([2001:bc8:30d7:101::1]:59218) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5EO8-0002Q6-39 for qemu-devel@nongnu.org; Wed, 17 Jun 2015 10:32:24 -0400 Date: Wed, 17 Jun 2015 16:32:22 +0200 From: Aurelien Jarno Message-ID: <20150617143222.GC3379@aurel32.net> References: <1434488919-7615-1-git-send-email-agraf@suse.de> <20150617134639.GD19635@aurel32.net> <55817D7D.7000505@de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <55817D7D.7000505@de.ibm.com> Sender: Aurelien Jarno Subject: Re: [Qemu-devel] [PATCH] s390x: Switch to s390-ccw machine as default List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Christian Borntraeger Cc: Cornelia Huck , Alexander Graf , qemu-devel@nongnu.org On 2015-06-17 16:00, Christian Borntraeger wrote: > Am 17.06.2015 um 15:46 schrieb Aurelien Jarno: > > On 2015-06-16 23:08, Alexander Graf wrote: > >> We now finally have TCG support for the basic set of instructions necessary > >> to run the s390-ccw machine. That means in any aspect possible that machine > >> type is now superior to the legacy s390-virtio machine. > >> > >> Switch over to the ccw machine as default. That way people don't get a halfway > >> broken machine with the s390x target. > > > > It seems the current s390x-ccw firmware doesn't allow to boot on a > > virtio-scsi-ccw disk (but this is not a regression compared to the > > s390-virtio machine). virtio-scsi has some advantages over virtio-blk, > > like the possibility to do thin-provisioning. Of course one can use a > > small virtio-blk for the /boot partition, and virtio-scsi for the > > remaining disks. > > > > Do you think it would possible to add it? Given a virtio-scsi device can > > provide multiple disks, how can we pass the disk to boot on to the > > firmware? Currently it seems we pass the ccw device in GR7, but not more > > details. > > Yes, we look into that, Integrating this into s390 specifics without adding > hacks that have to last forever will take most of the time. We have to > consider aspects like loadparm, the existing interfaces for the zfcp > connectivity in the diag308 handler and so on (so that /sys/firmware/ipl/ > reflects the disks) - so give us some time to do it properly to see > how this can be integrated. Great, thanks for working on that. -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurelien@aurel32.net http://www.aurel32.net