From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44256) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Vj2zM-0008IG-Ge for qemu-devel@nongnu.org; Wed, 20 Nov 2013 03:18:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Vj2zG-00082F-Ea for qemu-devel@nongnu.org; Wed, 20 Nov 2013 03:18:20 -0500 Received: from mx1.redhat.com ([209.132.183.28]:12922) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Vj2zG-000828-7C for qemu-devel@nongnu.org; Wed, 20 Nov 2013 03:18:14 -0500 Message-ID: <1384935480.2005.38.camel@nilsson.home.kraxel.org> From: Gerd Hoffmann Date: Wed, 20 Nov 2013 09:18:00 +0100 In-Reply-To: <20131119205455.GC15004@redhat.com> References: <1384269110-23613-1-git-send-email-lersek@redhat.com> <528AA407.8070503@redhat.com> <1384851266.16718.162.camel@nilsson.home.kraxel.org> <528B5A2B.3060100@redhat.com> <20131119205455.GC15004@redhat.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [edk2] [edk2 PATCH 0/1] OvmfPkg: grab ACPI tables from QEMU List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: Wei Liu , edk2-devel@lists.sourceforge.net, Laszlo Ersek , qemu-devel@nongnu.org Hi, > > > btw: q35 has a fixed 1G window, max low ram addr is 0xb000000, the > > > remaining address space (0xb0000000 -> 0xc0000000) is used for > > > mmconfig. > > Is it really fixed? My understanding is it's programmed by firmware, > you can put mmconfig whereever you want. Not really fixed, but it is a most useful configuration. You can place large bars (up to 512M) @ 0xc0000000 then, and you have a single region for your bars which makes management easy. If you place the mmconfig somewhere else it only gets more complicated. cheers, Gerd