Disable preadv/pwritev support
[qemu-kvm/fedora.git] / migration-exec.c
blobef4620f79e74ba519562cf8892a0f3f4b54ebc50
1 /*
2 * QEMU live migration
4 * Copyright IBM, Corp. 2008
5 * Copyright Dell MessageOne 2008
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Charles Duffy <charles_duffy@messageone.com>
11 * This work is licensed under the terms of the GNU GPL, version 2. See
12 * the COPYING file in the top-level directory.
16 #include "qemu-common.h"
17 #include "qemu_socket.h"
18 #include "migration.h"
19 #include "qemu-char.h"
20 #include "sysemu.h"
21 #include "buffered_file.h"
22 #include "block.h"
24 //#define DEBUG_MIGRATION_EXEC
26 #ifdef DEBUG_MIGRATION_EXEC
27 #define dprintf(fmt, ...) \
28 do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
29 #else
30 #define dprintf(fmt, ...) \
31 do { } while (0)
32 #endif
34 static int file_errno(FdMigrationState *s)
36 return errno;
39 static int file_write(FdMigrationState *s, const void * buf, size_t size)
41 return write(s->fd, buf, size);
44 static int exec_close(FdMigrationState *s)
46 dprintf("exec_close\n");
47 if (s->opaque) {
48 qemu_fclose(s->opaque);
49 s->opaque = NULL;
50 s->fd = -1;
52 return 0;
55 MigrationState *exec_start_outgoing_migration(const char *command,
56 int64_t bandwidth_limit,
57 int detach)
59 FdMigrationState *s;
60 FILE *f;
62 s = qemu_mallocz(sizeof(*s));
64 f = popen(command, "w");
65 if (f == NULL) {
66 dprintf("Unable to popen exec target\n");
67 goto err_after_alloc;
70 s->fd = fileno(f);
71 if (s->fd == -1) {
72 dprintf("Unable to retrieve file descriptor for popen'd handle\n");
73 goto err_after_open;
76 socket_set_nonblock(s->fd);
78 s->opaque = qemu_popen(f, "w");
80 s->close = exec_close;
81 s->get_error = file_errno;
82 s->write = file_write;
83 s->mig_state.cancel = migrate_fd_cancel;
84 s->mig_state.get_status = migrate_fd_get_status;
85 s->mig_state.release = migrate_fd_release;
87 s->state = MIG_STATE_ACTIVE;
88 s->mon_resume = NULL;
89 s->bandwidth_limit = bandwidth_limit;
91 if (!detach)
92 migrate_fd_monitor_suspend(s);
94 migrate_fd_connect(s);
95 return &s->mig_state;
97 err_after_open:
98 pclose(f);
99 err_after_alloc:
100 qemu_free(s);
101 return NULL;
104 static void exec_accept_incoming_migration(void *opaque)
106 QEMUFile *f = opaque;
107 int ret;
109 ret = qemu_loadvm_state(f);
110 if (ret < 0) {
111 fprintf(stderr, "load of migration failed\n");
112 goto err;
114 qemu_announce_self();
115 dprintf("successfully loaded vm state\n");
116 /* we've successfully migrated, close the fd */
117 qemu_set_fd_handler2(qemu_popen_fd(f), NULL, NULL, NULL, NULL);
118 if (autostart)
119 vm_start();
121 err:
122 qemu_fclose(f);
125 int exec_start_incoming_migration(const char *command)
127 QEMUFile *f;
129 dprintf("Attempting to start an incoming migration\n");
130 f = qemu_popen_cmd(command, "r");
131 if(f == NULL) {
132 dprintf("Unable to apply qemu wrapper to popen file\n");
133 return -errno;
136 qemu_set_fd_handler2(qemu_popen_fd(f), NULL,
137 exec_accept_incoming_migration, NULL,
138 (void *)(unsigned long)f);
140 return 0;