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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 F3235C43463 for ; Sat, 19 Sep 2020 19:46:44 +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 0E74D21D42 for ; Sat, 19 Sep 2020 19:46:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0E74D21D42 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:39578 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kJiol-0002AH-56 for qemu-devel@archiver.kernel.org; Sat, 19 Sep 2020 15:46:43 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33232) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kJink-0001cl-9s for qemu-devel@nongnu.org; Sat, 19 Sep 2020 15:45:40 -0400 Received: from indium.canonical.com ([91.189.90.7]:39768) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kJini-0008Az-0y for qemu-devel@nongnu.org; Sat, 19 Sep 2020 15:45:40 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1kJinf-0004bs-LT for ; Sat, 19 Sep 2020 19:45:35 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 9078F2E80E7 for ; Sat, 19 Sep 2020 19:45:35 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sat, 19 Sep 2020 19:38:01 -0000 From: Benjamin David Lunt <1896342@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: fysnet X-Launchpad-Bug-Reporter: Benjamin David Lunt (fysnet) X-Launchpad-Bug-Modifier: Benjamin David Lunt (fysnet) References: <160054207000.14948.11107647546582134186.malonedeb@gac.canonical.com> Message-Id: <160054428139.14798.14925272531331087384.malone@gac.canonical.com> Subject: [Bug 1896342] Re: IDE ATA IDENTIFY WORD 106 X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="83bdf6c8a3a5f87722c8927e54838522f3e57504"; Instance="production" X-Launchpad-Hash: 45214963f857204ad419d8aee5a1d555a6cf4165 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/19 15:10:41 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.248, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1896342 <1896342@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For more information, Annex-E of the ACS-2 explains this as well. http://www.t13.org/Documents/UploadedDocuments/docs2009/d2015r2 -ATAATAPI_Command_set_-_2_ACS-2.pdf See the statement on the top of page 165 as well. "If bit 13 is set, then bits 3:0 are valid". Page 119 of that same document states: "13 1 =3D Device has multiple logical sectors per physical sector." In my opinion, if bit 13 is set and bits 3:0 are valid, then bits 3:0 should be non-zero. Therefore, I gather that in QEMU (assuming that get_physical_block_exp() returns the same value shown in the example listing above): 1) if get_physical_block_exp() return a non-zero value, bit 13 must be set = and bits 3:0 will be non-zero. 2) if get_physical_block_exp() return a zero value, bit 13 must be clear an= d bits 3:0 must be ignored. Please correct me if I am wrong in these assumptions. Thanks, Ben -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1896342 Title: IDE ATA IDENTIFY WORD 106 Status in QEMU: New Bug description: The code at line 202 in hw/ide/core.c (https://git.qemu.org/?p=3Dqemu.git;a=3Dblob;f=3Dhw/ide/core.c;#l201) hard codes bit 13 set. However, get_physical_block_exp() can and may ret= urn 0, which is a valid response. If get_physical_block_exp() does return z= ero, bit 13 should not be set. ATAPI8 states (Section 7.17.7.73): "Bit 13 of word 106 shall be set to one to indicate that the device has = more than one logical sector per physical sector" and gives the examples: Bits (3:0): 0 =3D 2^0 =3D 1 logical sector per physical sector Bits (3:0): 1 =3D 2^1 =3D 2 logical sector per physical sector Bits (3:0): 2 =3D 2^2 =3D 4 logical sector per physical sector Bits (3:0): 3 =3D 2^3 =3D 8 logical sector per physical sector Therefore, if bit 13 is set, bits 3:0 must be greater than zero. If get_physical_block_exp() returns zero then there is a 1:1 ratio and bit 13 must be 0. Just my opinion. Thanks, Ben To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1896342/+subscriptions