From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49367) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YEfuV-0008GJ-A2 for qemu-devel@nongnu.org; Fri, 23 Jan 2015 10:12:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YEfuQ-0005Wm-Eg for qemu-devel@nongnu.org; Fri, 23 Jan 2015 10:12:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56312) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YEfuQ-0005Wi-7v for qemu-devel@nongnu.org; Fri, 23 Jan 2015 10:12:30 -0500 Date: Fri, 23 Jan 2015 17:12:24 +0200 From: "Michael S. Tsirkin" Message-ID: <20150123151224.GA6293@redhat.com> References: <1422016183-15968-1-git-send-email-kraxel@redhat.com> <20150123133341.GD4579@redhat.com> <1422021207.13166.38.camel@nilsson.home.kraxel.org> <20150123135851.GG4579@redhat.com> <1422024508.13166.47.camel@nilsson.home.kraxel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1422024508.13166.47.camel@nilsson.home.kraxel.org> Subject: Re: [Qemu-devel] [RfC PATCH] virtio-pci: place msix regions in modern virtio bar List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gerd Hoffmann Cc: qemu-devel@nongnu.org, Anthony Liguori On Fri, Jan 23, 2015 at 03:48:28PM +0100, Gerd Hoffmann wrote: > Hi, > > > > Also seabios wouldn't map the bar > > > above 4G. > > > We can teach it to do that, and even if not, OS can do it on hotplug. > > Just to clarify: seabios can do it in the general case, it just wouldn't > do it for xhci specifically because otherwise the seabios xhci driver > wouldn't be able to reach the registers any more ... > > For non-transitional virtio-{blk,scsi,net} devices seabios (and ipxe) > would have a simliar problem btw: When mapping the bars above 4G it > can't handle the devices any more. You can always use the config cap for this. I didn't implement it yet, but I will. > But we'll probably stick to transitional by default for a while (where > seabios can just use the legacy registers in io address space), io *is* very crowded. I think we should try and code up modern drivers when we have the time. > and > there also is ovmf coming which runs in 64bit mode so mapping the bars > high isn't a problem there. > > cheers, > Gerd >