From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37342) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UwIeT-00082N-SV for qemu-devel@nongnu.org; Mon, 08 Jul 2013 17:07:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UwIeQ-00027J-SV for qemu-devel@nongnu.org; Mon, 08 Jul 2013 17:07:15 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:59634) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UwIeQ-000279-MH for qemu-devel@nongnu.org; Mon, 08 Jul 2013 17:07:14 -0400 Received: from /spool/local by e39.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 8 Jul 2013 15:07:13 -0600 Received: from d03relay03.boulder.ibm.com (d03relay03.boulder.ibm.com [9.17.195.228]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id 76F443E40039 for ; Mon, 8 Jul 2013 15:06:50 -0600 (MDT) Received: from d03av06.boulder.ibm.com (d03av06.boulder.ibm.com [9.17.195.245]) by d03relay03.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r68L75cd070160 for ; Mon, 8 Jul 2013 15:07:08 -0600 Received: from d03av06.boulder.ibm.com (loopback [127.0.0.1]) by d03av06.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r68L9bb1009831 for ; Mon, 8 Jul 2013 15:09:38 -0600 From: Anthony Liguori In-Reply-To: <39D95139-6E9C-4FD8-A007-C08444C1AA67@suse.de> References: <1372338255-3934-1-git-send-email-peter.maydell@linaro.org> <39E5AB85-E7DD-4B9F-9F6F-F80CA6FCAC11@suse.de> <83A07262-ED9A-4E5A-BC11-5B357F5B4996@suse.de> <87li5gbyqv.fsf@codemonkey.ws> <39D95139-6E9C-4FD8-A007-C08444C1AA67@suse.de> Date: Mon, 08 Jul 2013 16:06:57 -0500 Message-ID: <87mwpwpxqm.fsf@codemonkey.ws> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: Re: [Qemu-devel] [PATCH 0/8] Add virtio-mmio and use it in vexpress List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf Cc: Peter Maydell , patches@linaro.org, qemu-devel@nongnu.org, David Gibson , kvmarm@lists.cs.columbia.edu, KONRAD Frederic Alexander Graf writes: > On 08.07.2013, at 22:08, Anthony Liguori wrote: > >> I think we're trying to fit a square peg into a round hole. >> >> virtio-mmio is a virtio transport where each device has a dedicated set >> of system resources. >> >> Alex, it sounds like you want virtio-mmio-bus which would be a single >> set of system resources that implemented a virtio bus on top of it. > > Well, what I really want is a sysbus that behaves like PCI from a > usability point of view ;). Which means you need to have (1) a discovery mechanism with a stable addressing mechanism (2) a way to communicate this to the guest from the host. That's all that PCI is. A host controller is a "sysbus" device that uses a standardized discovery and addressing mechanism. Regards, Anthony Liguori > > > Alex