From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50ABDC7618F for ; Wed, 17 Jul 2019 19:46:47 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2358F21851 for ; Wed, 17 Jul 2019 19:46:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2358F21851 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60198 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnpsz-0004yF-EQ for qemu-devel@archiver.kernel.org; Wed, 17 Jul 2019 15:46:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53276) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hnpso-0004VE-CH for qemu-devel@nongnu.org; Wed, 17 Jul 2019 15:46:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hnpsn-0005fI-BW for qemu-devel@nongnu.org; Wed, 17 Jul 2019 15:46:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41344) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hnpsl-0005dl-4d; Wed, 17 Jul 2019 15:46:31 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9D0C081F2F; Wed, 17 Jul 2019 19:46:29 +0000 (UTC) Received: from localhost.localdomain (ovpn-117-47.ams2.redhat.com [10.36.117.47]) by smtp.corp.redhat.com (Postfix) with ESMTPS id CCB9B5C257; Wed, 17 Jul 2019 19:46:24 +0000 (UTC) Date: Wed, 17 Jul 2019 21:46:23 +0200 From: Kevin Wolf To: Sam Eiderman Message-ID: <20190717194623.GF6471@localhost.localdomain> References: <20190626123948.10199-1-shmuel.eiderman@oracle.com> <20190701074117.pkmzhon6v7nafq2p@sirius.home.kraxel.org> <424BE97C-7EAF-4B28-B580-AC2B5261197C@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.3 (2019-02-01) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 17 Jul 2019 19:46:29 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interface X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-block@nongnu.org, Arbel Moshe , seabios@seabios.org, QEMU , Max Reitz , Kevin O'Connor , Liran Alon , Gerd Hoffmann , Karl Heubaum Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Am 17.07.2019 um 21:03 hat Sam Eiderman geschrieben: > Gentle ping. Through which tree is this supposed to go? I feel this is more firmware interface related than block layer stuff. Kevin > > On 8 Jul 2019, at 20:30, Sam Eiderman wrote: > > > > Thanks Gerd, > > > > Gentle ping on this. > > > > Sam > > > >> On 1 Jul 2019, at 10:41, Gerd Hoffmann wrote: > >> > >> On Wed, Jun 26, 2019 at 03:39:40PM +0300, Sam Eiderman wrote: > >>> v1: > >>> > >>> Non-standard logical geometries break under QEMU. > >>> > >>> A virtual disk which contains an operating system which depends on > >>> logical geometries (consistent values being reported from BIOS INT13 > >>> AH=08) will most likely break under QEMU/SeaBIOS if it has non-standard > >>> logical geometries - for example 56 SPT (sectors per track). > >>> No matter what QEMU will guess - SeaBIOS, for large enough disks - will > >>> use LBA translation, which will report 63 SPT instead. > >>> > >>> In addition we can not enforce SeaBIOS to rely on phyiscal geometries at > >>> all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not > >>> report more than 16 physical heads when moved to an IDE controller, the > >>> ATA spec allows a maximum of 16 heads - this is an artifact of > >>> virtualization. > >>> > >>> By supplying the logical geometies directly we are able to support such > >>> "exotic" disks. > >>> > >>> We will use fw_cfg to do just that. > >>> > >>> v2: > >>> > >>> Fix missing parenthesis check in > >>> "hd-geo-test: Add tests for lchs override" > >>> > >>> v3: > >>> > >>> * Rename fw_cfg key to "bios-geometry". > >>> * Remove "extendible" interface. > >>> * Add cpu_to_le32 fix as Laszlo suggested or big endian hosts > >>> * Fix last qtest commit - automatic docker tester for some reason does not have qemu-img set > >>> > >>> v4: > >>> > >>> * Change fw_cfg interface from mixed textual/binary to textual only > >>> > >>> v5: > >>> > >>> * Fix line > 80 chars in tests/hd-geo-test.c > >> > >> Reviewed-by: Gerd Hoffmann > >> > >> cheers, > >> Gerd > >> > > >