From nobody Mon Feb 9 16:19:46 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1533307801108432.6027741323062; Fri, 3 Aug 2018 07:50:01 -0700 (PDT) Received: from localhost ([::1]:51730 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1flbOr-0003xU-SE for importer@patchew.org; Fri, 03 Aug 2018 10:49:53 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49899) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1flbMm-0002mj-H8 for qemu-devel@nongnu.org; Fri, 03 Aug 2018 10:47:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1flbMi-0007hq-Hu for qemu-devel@nongnu.org; Fri, 03 Aug 2018 10:47:44 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:35874 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1flbMe-0007f1-Bd; Fri, 03 Aug 2018 10:47:36 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B23117A7EF; Fri, 3 Aug 2018 14:47:35 +0000 (UTC) Received: from localhost (ovpn-117-231.ams2.redhat.com [10.36.117.231]) by smtp.corp.redhat.com (Postfix) with ESMTP id 602571C72C; Fri, 3 Aug 2018 14:47:35 +0000 (UTC) From: Stefan Hajnoczi To: Date: Fri, 3 Aug 2018 15:47:19 +0100 Message-Id: <20180803144721.17036-5-stefanha@redhat.com> In-Reply-To: <20180803144721.17036-1-stefanha@redhat.com> References: <20180803144721.17036-1-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 03 Aug 2018 14:47:35 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 03 Aug 2018 14:47:35 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'stefanha@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v4 4/6] loader: add rom transaction API X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , jim@groklearning.com, mail@steffen-goertz.de, Su Hang , ilg@livius.net, Alistair Francis , Subbaraya Sundeep , Steffen Gortz , qemu-arm@nongnu.org, Joel Stanley , Stefan Hajnoczi , jusual@mail.ru Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RDMRC_1 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Image file loaders may add a series of roms. If an error occurs partway through loading there is no easy way to drop previously added roms. This patch adds a transaction mechanism that works like this: rom_transaction_begin(); ...call rom_add_*()... rom_transaction_end(ok); If ok is false then roms added in this transaction are dropped. Signed-off-by: Stefan Hajnoczi --- include/hw/loader.h | 19 +++++++++++++++++++ hw/core/loader.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+) diff --git a/include/hw/loader.h b/include/hw/loader.h index e98b84b8f9..5235f119a3 100644 --- a/include/hw/loader.h +++ b/include/hw/loader.h @@ -225,6 +225,25 @@ int rom_check_and_register_reset(void); void rom_set_fw(FWCfgState *f); void rom_set_order_override(int order); void rom_reset_order_override(void); + +/** + * rom_transaction_begin: + * + * Call this before of a series of rom_add_*() calls. Call + * rom_transaction_end() afterwards to commit or abort. These functions a= re + * useful for undoing a series of rom_add_*() calls if image file loading = fails + * partway through. + */ +void rom_transaction_begin(void); + +/** + * rom_transaction_end: + * @commit: true to commit added roms, false to drop added roms + * + * Call this after a series of rom_add_*() calls. See rom_transaction_beg= in(). + */ +void rom_transaction_end(bool commit); + int rom_copy(uint8_t *dest, hwaddr addr, size_t size); void *rom_ptr(hwaddr addr, size_t size); void hmp_info_roms(Monitor *mon, const QDict *qdict); diff --git a/hw/core/loader.c b/hw/core/loader.c index 0c72e7c05a..612420b870 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -840,6 +840,8 @@ struct Rom { char *fw_dir; char *fw_file; =20 + bool committed; + hwaddr addr; QTAILQ_ENTRY(Rom) next; }; @@ -877,6 +879,8 @@ static void rom_insert(Rom *rom) rom->as =3D &address_space_memory; } =20 + rom->committed =3D false; + /* List is ordered by load address in the same address space */ QTAILQ_FOREACH(item, &roms, next) { if (rom_order_compare(rom, item)) { @@ -1168,6 +1172,34 @@ void rom_reset_order_override(void) fw_cfg_reset_order_override(fw_cfg); } =20 +void rom_transaction_begin(void) +{ + Rom *rom; + + /* Ignore ROMs added without the transaction API */ + QTAILQ_FOREACH(rom, &roms, next) { + rom->committed =3D true; + } +} + +void rom_transaction_end(bool commit) +{ + Rom *rom; + Rom *tmp; + + QTAILQ_FOREACH_SAFE(rom, &roms, next, tmp) { + if (rom->committed) { + continue; + } + if (commit) { + rom->committed =3D true; + } else { + QTAILQ_REMOVE(&roms, rom, next); + rom_free(rom); + } + } +} + static Rom *find_rom(hwaddr addr, size_t size) { Rom *rom; --=20 2.17.1