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Thu, 9 Feb 2023 11:21:01 -0800 From: Avihai Horon To: CC: Alex Williamson , Juan Quintela , "Dr. David Alan Gilbert" , "Michael S. Tsirkin" , Cornelia Huck , Paolo Bonzini , Vladimir Sementsov-Ogievskiy , =?utf-8?q?C=C3=A9?= =?utf-8?q?dric_Le_Goater?= , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Avihai Horon , Kirti Wankhede , Tarun Gupta , Joao Martins Subject: [PATCH v10 04/12] migration/qemu-file: Add qemu_file_get_to_fd() Date: Thu, 9 Feb 2023 21:20:35 +0200 Message-ID: <20230209192043.14885-5-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230209192043.14885-1-avihaih@nvidia.com> References: <20230209192043.14885-1-avihaih@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT060:EE_|SA1PR12MB7444:EE_ X-MS-Office365-Filtering-Correlation-Id: b7241645-edfe-492e-d90e-08db0ad2d310 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc7edge1.nvidia.com; CAT:NONE; SFS:(13230025)(4636009)(376002)(346002)(136003)(396003)(39860400002)(451199018)(40470700004)(46966006)(36840700001)(54906003)(356005)(316002)(36756003)(426003)(47076005)(66574015)(40480700001)(5660300002)(40460700003)(82740400003)(7636003)(8936002)(41300700001)(7416002)(36860700001)(2906002)(8676002)(6916009)(70206006)(4326008)(70586007)(83380400001)(6666004)(186003)(82310400005)(2616005)(478600001)(86362001)(1076003)(26005)(7696005)(336012); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Feb 2023 19:21:20.1532 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b7241645-edfe-492e-d90e-08db0ad2d310 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.118.232]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT060.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7444 Received-SPF: softfail client-ip=2a01:111:f400:7eaa::60f; envelope-from=avihaih@nvidia.com; helo=NAM11-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add new function qemu_file_get_to_fd() that allows reading data from QEMUFile and writing it straight into a given fd. This will be used later in VFIO migration code. Signed-off-by: Avihai Horon Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Cédric Le Goater Reviewed-by: Juan Quintela --- migration/qemu-file.h | 1 + migration/qemu-file.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/migration/qemu-file.h b/migration/qemu-file.h index fa13d04d78..9d0155a2a1 100644 --- a/migration/qemu-file.h +++ b/migration/qemu-file.h @@ -148,6 +148,7 @@ int qemu_file_shutdown(QEMUFile *f); QEMUFile *qemu_file_get_return_path(QEMUFile *f); void qemu_fflush(QEMUFile *f); void qemu_file_set_blocking(QEMUFile *f, bool block); +int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size); void ram_control_before_iterate(QEMUFile *f, uint64_t flags); void ram_control_after_iterate(QEMUFile *f, uint64_t flags); diff --git a/migration/qemu-file.c b/migration/qemu-file.c index 2d5f74ffc2..102ab3b439 100644 --- a/migration/qemu-file.c +++ b/migration/qemu-file.c @@ -940,3 +940,37 @@ QIOChannel *qemu_file_get_ioc(QEMUFile *file) { return file->ioc; } + +/* + * Read size bytes from QEMUFile f and write them to fd. + */ +int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size) +{ + while (size) { + size_t pending = f->buf_size - f->buf_index; + ssize_t rc; + + if (!pending) { + rc = qemu_fill_buffer(f); + if (rc < 0) { + return rc; + } + if (rc == 0) { + return -EIO; + } + continue; + } + + rc = write(fd, f->buf + f->buf_index, MIN(pending, size)); + if (rc < 0) { + return -errno; + } + if (rc == 0) { + return -EIO; + } + f->buf_index += rc; + size -= rc; + } + + return 0; +}