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Thu, 30 Jul 2020 15:38:03 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 06UFc2t8014453; Thu, 30 Jul 2020 15:38:02 GMT Received: from ca-dev63.us.oracle.com (/10.211.8.221) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 30 Jul 2020 08:38:02 -0700 From: Steve Sistare To: qemu-devel@nongnu.org Subject: [PATCH V1 12/32] vl: pause option Date: Thu, 30 Jul 2020 08:14:16 -0700 Message-Id: <1596122076-341293-13-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1596122076-341293-1-git-send-email-steven.sistare@oracle.com> References: <1596122076-341293-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9698 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 bulkscore=0 malwarescore=0 suspectscore=1 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007300111 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9698 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 clxscore=1015 mlxlogscore=999 malwarescore=0 impostorscore=0 priorityscore=1501 spamscore=0 phishscore=0 suspectscore=1 bulkscore=0 mlxscore=0 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007300111 Received-SPF: pass client-ip=156.151.31.85; envelope-from=steven.sistare@oracle.com; helo=userp2120.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/30 11:38:02 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -53 X-Spam_score: -5.4 X-Spam_bar: ----- X-Spam_report: (-5.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: "Daniel P. Berrange" , "Michael S. Tsirkin" , =?utf-8?q?Alex_Benn=C3=A9e?= , Juan Quintela , "Dr. David Alan Gilbert" , Markus Armbruster , Alex Williamson , Steve Sistare , Stefan Hajnoczi , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Provide the -pause command-line parameter and the QEMU_PAUSE environment variable to briefly pause QEMU in main and allow a developer to attach gdb. Useful when the developer does not invoke QEMU directly, such as when using libvirt. Usage: qemu -pause or export QEMU_PAUSE= Signed-off-by: Steve Sistare --- qemu-options.hx | 9 +++++++++ softmmu/vl.c | 15 ++++++++++++++- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/qemu-options.hx b/qemu-options.hx index 708583b..8505cf2 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -3668,6 +3668,15 @@ SRST option is experimental. ERST +DEF("pause", HAS_ARG, QEMU_OPTION_pause, \ + "-pause secs Pause for secs seconds on entry to main.\n", QEMU_ARCH_ALL) + +SRST +``--pause secs`` + Pause for a number of seconds on entry to main. Useful for attaching + a debugger after QEMU has been launched by some other entity. +ERST + DEF("S", 0, QEMU_OPTION_S, \ "-S freeze CPU at startup (use 'c' to start execution)\n", QEMU_ARCH_ALL) diff --git a/softmmu/vl.c b/softmmu/vl.c index 8478778..951994f 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -2844,7 +2844,7 @@ static void create_default_memdev(MachineState *ms, const char *path) void qemu_init(int argc, char **argv, char **envp) { - int i; + int i, seconds; int snapshot, linux_boot; const char *initrd_filename; const char *kernel_filename, *kernel_cmdline; @@ -2882,6 +2882,13 @@ void qemu_init(int argc, char **argv, char **envp) QemuPluginList plugin_list = QTAILQ_HEAD_INITIALIZER(plugin_list); int mem_prealloc = 0; /* force preallocation of physical target memory */ + if (getenv("QEMU_PAUSE")) { + seconds = atoi(getenv("QEMU_PAUSE")); + printf("Pausing %d seconds for debugger. QEMU PID is %d\n", + seconds, getpid()); + sleep(seconds); + } + os_set_line_buffering(); error_init(argv[0]); @@ -3204,6 +3211,12 @@ void qemu_init(int argc, char **argv, char **envp) case QEMU_OPTION_gdb: add_device_config(DEV_GDB, optarg); break; + case QEMU_OPTION_pause: + seconds = atoi(optarg); + printf("Pausing %d seconds for debugger. QEMU PID is %d\n", + seconds, getpid()); + sleep(seconds); + break; case QEMU_OPTION_L: if (is_help_option(optarg)) { list_data_dirs = true;