From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:35026) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1StId9-0003oJ-VL for qemu-devel@nongnu.org; Mon, 23 Jul 2012 09:25:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1StId1-0003IO-Qn for qemu-devel@nongnu.org; Mon, 23 Jul 2012 09:24:59 -0400 Date: Mon, 23 Jul 2012 14:24:31 +0100 From: Matthew Garrett Message-ID: <20120723132431.GA21495@srcf.ucam.org> References: <80058105-0CF7-4FBD-BD4A-EF7532A8F5B8@suse.de> <1340833174.3732.65.camel@pasglop> <9D81F5FD-C680-4CC4-B3E0-E737C84BC1DB@suse.de> <1340834707.3732.81.camel@pasglop> <92004E32-9F3E-4F4F-8287-B2EF25C7B4F9@suse.de> <4FEB886A.5000605@us.ibm.com> <1343025621.2957.27.camel@pasglop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1343025621.2957.27.camel@pasglop> Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] spapr: Add support for -vga option List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Benjamin Herrenschmidt Cc: Anthony Liguori , Alexander Graf , Li Zhang , qemu-devel@nongnu.org, Li Zhang , airlied@redhat.com, qemu-ppc , Andreas =?iso-8859-1?Q?F=E4rber?= Dave Airlie wrote the dirty handling code, so Cc:ing him. I suspect transitioning offb over to a similar design would be fine by him. On Mon, Jul 23, 2012 at 04:40:21PM +1000, Benjamin Herrenschmidt wrote: > On Wed, 2012-06-27 at 17:25 -0500, Anthony Liguori wrote: > > > If a user asks for something and we can't make it work, we should fail. > > Note that QEMU's cirrus works fine with the new kernel cirrusdrmfb, so > I say we should allow it (needs to be able to the powerpc device .mak > as well tho. > > It shouldn't be primary because old RHEL's iirc used to have cirrusfb > enabled and that would blow due to guest kernel bugs among others. > > I haven't had a chance to try whatever userspace DDX the Xorg folks have > come up with to use on top of cirrusdrmfb, so that might need a bit of > fixing but there's no reason not to allow -vga cirrus at this point. > > Note to Matthew: cirrusdrmfb is a LOT SLOWER than offb for a similar > SW only dumb framebuffer, probably has to do with the way it does the > "dirty" stuff, not sure ... > > Why not draw directly into the emulated vram ? > > Cheers, > Ben. > > > -- Matthew Garrett | mjg59@srcf.ucam.org