From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerd Hoffmann Subject: Re: [SeaBIOS] [PATCH v5] fw/pci: Add support for mapping Intel IGD via QEMU Date: Wed, 01 Jun 2016 11:26:54 +0200 Message-ID: <1464773214.8823.16.camel@redhat.com> References: <20160517203151.6996.95545.stgit@gimli.home> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Cc: seabios@seabios.org, kvm@vger.kernel.org, qemu-devel@nongnu.org To: Alex Williamson Return-path: Received: from mx1.redhat.com ([209.132.183.28]:56868 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752036AbcFAJ05 convert rfc822-to-8bit (ORCPT ); Wed, 1 Jun 2016 05:26:57 -0400 In-Reply-To: <20160517203151.6996.95545.stgit@gimli.home> Sender: kvm-owner@vger.kernel.org List-ID: On Di, 2016-05-17 at 14:44 -0600, Alex Williamson wrote: > QEMU provides two fw_cfg files to support IGD. The first holds the > OpRegion data which holds the Video BIOS Table (VBT). This needs to > be copied into reserved memory and the address stored in the ASL > Storage register of the device at 0xFC offset in PCI config space. > The OpRegion is generally 8KB. This file is named "etc/igd-opregion". > > The second file tells us the required size of the stolen memory space > for the device. This space requires 1MB alignment and is generally > either 1MB to 8MB depending on hardware config, but may be hundreds of > MB for user specified stolen memory. The base address of the reserved > memory allocated for this is written back to the Base Data of Stolen > Memory register (BDSM) at PCI config offset 0x5C on the device. This > file is named "etc/igd-bdsm-size". > > QEMU documents these fw_cfg entries in docs/igd-assign.txt. > > Signed-off-by: Alex Williamson > --- > > v6: fw_cfg BDSM entry now holds an 8-byte size integer as suggested > by Gerd. Also renamed to etc/igd-bdsm-size. Filter based on bdf > to only make use of this for the Intel VGA device at address > 00:02.0, not that QEMU should attach this to anything else. > > As always, comments appreciated. I expect this will be on hold > pending the QEMU support: > > http://thread.gmane.org/gmane.comp.emulators.kvm.devel/152123 qemu patches are merged meanwhile. Patch applied to master and cherry-picked into 1.9-stable. thanks, Gerd