1 /* 2 * QEMU live migration via generic fd 3 * 4 * Copyright Red Hat, Inc. 2009-2016 5 * 6 * Authors: 7 * Chris Lalancette <clalance@redhat.com> 8 * Daniel P. Berrange <berrange@redhat.com> 9 * 10 * This work is licensed under the terms of the GNU GPL, version 2. See 11 * the COPYING file in the top-level directory. 12 * 13 * Contributions after 2012-01-13 are licensed under the terms of the 14 * GNU GPL, version 2 or (at your option) any later version. 15 */ 16 17 #include "qemu/osdep.h" 18 #include "channel.h" 19 #include "fd.h" 20 #include "file.h" 21 #include "migration.h" 22 #include "monitor/monitor.h" 23 #include "qemu/error-report.h" 24 #include "qemu/sockets.h" 25 #include "io/channel-util.h" 26 #include "trace.h" 27 28 static bool fd_is_pipe(int fd) 29 { 30 struct stat statbuf; 31 32 if (fstat(fd, &statbuf) == -1) { 33 return false; 34 } 35 36 return S_ISFIFO(statbuf.st_mode); 37 } 38 39 static bool migration_fd_valid(int fd) 40 { 41 if (fd_is_socket(fd)) { 42 return true; 43 } 44 45 if (fd_is_pipe(fd)) { 46 return true; 47 } 48 49 return false; 50 } 51 52 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp) 53 { 54 QIOChannel *ioc; 55 int fd = monitor_get_fd(monitor_cur(), fdname, errp); 56 if (fd == -1) { 57 return; 58 } 59 60 if (!migration_fd_valid(fd)) { 61 warn_report("fd: migration to a file is deprecated." 62 " Use file: instead."); 63 } 64 65 trace_migration_fd_outgoing(fd); 66 ioc = qio_channel_new_fd(fd, errp); 67 if (!ioc) { 68 close(fd); 69 return; 70 } 71 72 qio_channel_set_name(ioc, "migration-fd-outgoing"); 73 migration_channel_connect(s, ioc, NULL, NULL); 74 object_unref(OBJECT(ioc)); 75 } 76 77 static gboolean fd_accept_incoming_migration(QIOChannel *ioc, 78 GIOCondition condition, 79 gpointer opaque) 80 { 81 migration_channel_process_incoming(ioc); 82 object_unref(OBJECT(ioc)); 83 return G_SOURCE_REMOVE; 84 } 85 86 void fd_start_incoming_migration(const char *fdname, Error **errp) 87 { 88 QIOChannel *ioc; 89 int fd = monitor_fd_param(monitor_cur(), fdname, errp); 90 if (fd == -1) { 91 return; 92 } 93 94 if (!migration_fd_valid(fd)) { 95 warn_report("fd: migration to a file is deprecated." 96 " Use file: instead."); 97 } 98 99 trace_migration_fd_incoming(fd); 100 101 ioc = qio_channel_new_fd(fd, errp); 102 if (!ioc) { 103 close(fd); 104 return; 105 } 106 107 qio_channel_set_name(ioc, "migration-fd-incoming"); 108 qio_channel_add_watch_full(ioc, G_IO_IN, 109 fd_accept_incoming_migration, 110 NULL, NULL, 111 g_main_context_get_thread_default()); 112 } 113