From nobody Sun Dec 14 20:37:38 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=oracle.com ARC-Seal: i=1; a=rsa-sha256; t=1605523564; cv=none; d=zohomail.com; s=zohoarc; b=ZgeZglj4Tq+0OQ5+/CuyIzrZvbmS1Opt+Wy2yfbguFApHFVzSgZobLZyB0f/4vZy0teOsb3vkUp5WxeVobKSp3PTF56QNuL9yfBFS7H9p6CiHBhPZnHLHwIcipu6XVnAYqgN6emposrut4LXWcZ4+HaUV0fnQAJg71q/YzZCITs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1605523564; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=eJwmRU5kFwrdMzXJxYRDPPGvwmbEIbAUidbEwMQXjsg=; b=V7yxnnDKyHtP30/ofvhCdHk7W95IOGFXQ9ysBg4mh8Dqc4VWj/8R9xtDnNGyUShXyg6XkhGB0lVy1VTgWgLXhmVNRy3iH3mGlhOjuUc0x14MWuGiLyP6CIWz1Q6/tULo0PW2eKs2PPAbEsYhzxD5nqDKOrBe5ZayicEgUVNxku0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1605523564764919.3519902470904; Mon, 16 Nov 2020 02:46:04 -0800 (PST) Received: from localhost ([::1]:50654 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kec1L-0004AX-Nz for importer@patchew.org; Mon, 16 Nov 2020 05:46:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:35278) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kebzs-0002Qc-MT; Mon, 16 Nov 2020 05:44:34 -0500 Received: from aserp2130.oracle.com ([141.146.126.79]:42704) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kebzp-0001F5-5a; Mon, 16 Nov 2020 05:44:32 -0500 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0AGAeAwK126605; Mon, 16 Nov 2020 10:44:24 GMT Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2130.oracle.com with ESMTP id 34t4ramj7m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 16 Nov 2020 10:44:24 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0AGAeSgo129269; Mon, 16 Nov 2020 10:42:23 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3030.oracle.com with ESMTP id 34ts5uhngj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 16 Nov 2020 10:42:23 +0000 Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0AGAgMwo025554; Mon, 16 Nov 2020 10:42:22 GMT Received: from disaster-area.hh.sledj.net (/81.187.26.238) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 16 Nov 2020 02:42:22 -0800 Received: from localhost (disaster-area.hh.sledj.net [local]) by disaster-area.hh.sledj.net (OpenSMTPD) with ESMTPA id 1d9dce61; Mon, 16 Nov 2020 10:42:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=corp-2020-01-29; bh=eJwmRU5kFwrdMzXJxYRDPPGvwmbEIbAUidbEwMQXjsg=; b=g0GLCoHMUUT463eDlWNVnvN1H5m5WLBv3ASIpZ230XwhZohTrCYQnJ7ZPWaHTfaHb+b7 z8mLXxrabdb+sNaod0a91YJPTFhEso47MWooRGqcRyMd+MiamMxzNkhuTEpMDZOKFYac yQ8vVzn+9Q7ClDf7nFAYAJPiaRhGvZNw6HR+rKKiA+q/dP0mdAytSQnJmvHetSzvpnak k5P9ppbZZs1x7k/+y+TBHi5v03Le/TCPLeDUl+rG1LF49ItvsQBEcWf+GMFD7zx3UWoY XSiQ5twN4ZvPzJzh/iVCoKMoXC71+uWuW3i5lBH7w8mB4u1RsPDuHpGd01jbikYUCSRK /g== From: David Edmondson To: qemu-devel@nongnu.org Subject: [RFC PATCH 2/5] hw/block: Flash images can be smaller than the device Date: Mon, 16 Nov 2020 10:42:13 +0000 Message-Id: <20201116104216.439650-3-david.edmondson@oracle.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201116104216.439650-1-david.edmondson@oracle.com> References: <20201116104216.439650-1-david.edmondson@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9806 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 spamscore=0 phishscore=0 suspectscore=1 mlxscore=0 malwarescore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011160062 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9806 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 clxscore=1015 malwarescore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 mlxlogscore=999 adultscore=0 phishscore=0 suspectscore=1 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011160062 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=141.146.126.79; envelope-from=david.edmondson@oracle.com; helo=aserp2130.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/16 05:42:28 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: Kevin Wolf , Peter Maydell , qemu-block@nongnu.org, "Michael S. Tsirkin" , Max Reitz , David Edmondson , Shannon Zhao , qemu-arm@nongnu.org, Igor Mammedov , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" When loading a flash image into a device, allow the image to be smaller than the extent of the device. Signed-off-by: David Edmondson --- hw/block/block.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/hw/block/block.c b/hw/block/block.c index 8b284e1f14..40262546bd 100644 --- a/hw/block/block.c +++ b/hw/block/block.c @@ -16,8 +16,8 @@ =20 /* * Read the entire contents of @blk into @buf. - * @blk's contents must be @size bytes, and @size must be at most - * BDRV_REQUEST_MAX_BYTES. + * @blk's contents must not be more than @size bytes, and must be at + * most BDRV_REQUEST_MAX_BYTES in length. * On success, return true. * On failure, store an error through @errp and return false. * This function not intended for actual block devices, which read on @@ -38,10 +38,10 @@ bool blk_check_size_and_read_all(BlockBackend *blk, voi= d *buf, hwaddr size, name); return false; } - if (blk_len !=3D size) { - error_setg(errp, "device requires %" HWADDR_PRIu " bytes, " - "block backend %s provides %" PRIu64 " bytes", - size, name, blk_len); + if (blk_len > size) { + error_setg(errp, "block backend %s is too large for device " + "(%" PRIu64 " > %" HWADDR_PRIu ")", + name, blk_len, size); return false; } =20 @@ -51,8 +51,8 @@ bool blk_check_size_and_read_all(BlockBackend *blk, void = *buf, hwaddr size, * should probably rework the device to be more like an actual * block device and read only on demand. */ - assert(size <=3D BDRV_REQUEST_MAX_BYTES); - ret =3D blk_pread(blk, 0, buf, size); + assert(blk_len <=3D BDRV_REQUEST_MAX_BYTES); + ret =3D blk_pread(blk, 0, buf, blk_len); if (ret < 0) { error_setg_errno(errp, -ret, "can't read block backend %s", name); --=20 2.28.0