From patchwork Mon Nov 18 14:36:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13878682 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C6EFCD4921D for ; Mon, 18 Nov 2024 14:37:32 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tD2s9-0006K0-1Q; Mon, 18 Nov 2024 09:37:01 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tD2s7-0006Jc-9t for qemu-devel@nongnu.org; Mon, 18 Nov 2024 09:36:59 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tD2s5-0005ZF-Un for qemu-devel@nongnu.org; Mon, 18 Nov 2024 09:36:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1731940617; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=iiZ6qBQqN25G4itkQvdFae9EYfnugmegO1Dc0rTRFTw=; b=I5hJ5DFEaT8rxF13yxUCj7VudCvz0yLkqSxCfgnmP9ze4GLEB8fbZPu0aZT1MfyWYyCAYq QHxsiOD2WHKeVyNn8Gn96lTY9uC/lnywekYXWI19vmtX1slxxj8ZA5sAWGoRGCsfQCRCc+ v4109tOTgVqK8T9uyIbsg9PJSQL7GHk= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-196-bPZjI485O4Of6To5WU6lnw-1; Mon, 18 Nov 2024 09:36:54 -0500 X-MC-Unique: bPZjI485O4Of6To5WU6lnw-1 X-Mimecast-MFC-AGG-ID: bPZjI485O4Of6To5WU6lnw Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 75966193316F; Mon, 18 Nov 2024 14:36:52 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.39.194.228]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id CBBDA1956089; Mon, 18 Nov 2024 14:36:47 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Kevin Wolf , Hanna Reitz , qemu-block@nongnu.org Subject: [PATCH v2] vpc: Read images exported from Azure correctly Date: Mon, 18 Nov 2024 15:36:46 +0100 Message-ID: <20241118143646.33377-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass client-ip=170.10.133.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.142, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org It was found that 'qemu-nbd' is not able to work with some disk images exported from Azure. Looking at the 512b footer (which contains VPC metadata): 00000000 63 6f 6e 65 63 74 69 78 00 00 00 02 00 01 00 00 |conectix........| 00000010 ff ff ff ff ff ff ff ff 2e c7 9b 96 77 61 00 00 |............wa..| 00000020 00 07 00 00 57 69 32 6b 00 00 00 01 40 00 00 00 |....Wi2k....@...| 00000030 00 00 00 01 40 00 00 00 28 a2 10 3f 00 00 00 02 |....@...(..?....| 00000040 ff ff e7 47 8c 54 df 94 bd 35 71 4c 94 5f e5 44 |...G.T...5qL._.D| 00000050 44 53 92 1a 00 00 00 00 00 00 00 00 00 00 00 00 |DS..............| 00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| we can see that Azure uses a different 'Creator application' -- 'wa\0\0' (offset 0x1c, likely reads as 'Windows Azure') and QEMU uses this field to determine how it can get image size. Apparently, Azure uses 'new' method, just like Hyper-V. Signed-off-by: Vitaly Kuznetsov --- Alternatively, we can probably make 'current_size' the default and only use CHS for 'vpc '/'qemu'. --- block/vpc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/vpc.c b/block/vpc.c index d95a204612b7..b67798697c15 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -321,6 +321,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, * 'qemu' : CHS QEMU (uses disk geometry) * 'qem2' : current_size QEMU (uses current_size) * 'win ' : current_size Hyper-V + * 'wa\0\0': current_size Azure * 'd2v ' : current_size Disk2vhd * 'tap\0' : current_size XenServer * 'CTXS' : current_size XenConverter @@ -330,6 +331,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, * that have CHS geometry of the maximum size. */ use_chs = (!!strncmp(footer->creator_app, "win ", 4) && + !!memcmp(footer->creator_app, "wa\0", 4) && !!strncmp(footer->creator_app, "qem2", 4) && !!strncmp(footer->creator_app, "d2v ", 4) && !!strncmp(footer->creator_app, "CTXS", 4) &&