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Paolo Bonzini5ac1fad2009-08-18 15:56:25 +02001/*
2 * QEMU live migration via generic fd
3 *
4 * Copyright Red Hat, Inc. 2009
5 *
6 * Authors:
7 * Chris Lalancette <clalance@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
Paolo Bonzini6b620ca2012-01-13 17:44:23 +010012 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020014 */
15
16#include "qemu-common.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010017#include "qemu/sockets.h"
Paolo Bonzinicaf71f82012-12-17 18:19:50 +010018#include "migration/migration.h"
Paolo Bonzini83c90892012-12-17 18:19:49 +010019#include "monitor/monitor.h"
Juan Quintela557ec5a2012-10-03 14:07:31 +020020#include "migration/qemu-file.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010021#include "block/block.h"
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020022
23//#define DEBUG_MIGRATION_FD
24
25#ifdef DEBUG_MIGRATION_FD
malcd0f2c4c2010-02-07 02:03:50 +030026#define DPRINTF(fmt, ...) \
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020027 do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
28#else
malcd0f2c4c2010-02-07 02:03:50 +030029#define DPRINTF(fmt, ...) \
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020030 do { } while (0)
31#endif
32
Juan Quintela22f00a42010-05-11 15:56:35 +020033static int fd_errno(MigrationState *s)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020034{
35 return errno;
36}
37
Juan Quintela22f00a42010-05-11 15:56:35 +020038static int fd_write(MigrationState *s, const void * buf, size_t size)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020039{
40 return write(s->fd, buf, size);
41}
42
Juan Quintela22f00a42010-05-11 15:56:35 +020043static int fd_close(MigrationState *s)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020044{
Gerd Hoffmannaab22932011-10-27 09:12:04 +020045 struct stat st;
46 int ret;
47
malcd0f2c4c2010-02-07 02:03:50 +030048 DPRINTF("fd_close\n");
Paolo Bonzini6c360132012-09-27 13:30:15 +020049 ret = fstat(s->fd, &st);
50 if (ret == 0 && S_ISREG(st.st_mode)) {
51 /*
52 * If the file handle is a regular file make sure the
53 * data is flushed to disk before signaling success.
54 */
55 ret = fsync(s->fd);
Gerd Hoffmannaab22932011-10-27 09:12:04 +020056 if (ret != 0) {
57 ret = -errno;
Paolo Bonzini6c360132012-09-27 13:30:15 +020058 perror("migration-fd: fsync");
Gerd Hoffmannaab22932011-10-27 09:12:04 +020059 return ret;
60 }
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020061 }
Paolo Bonzini6c360132012-09-27 13:30:15 +020062 ret = close(s->fd);
63 s->fd = -1;
64 if (ret != 0) {
65 ret = -errno;
66 perror("migration-fd: close");
67 }
68 return ret;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020069}
70
Paolo Bonzinif37afb52012-10-02 10:02:46 +020071void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020072{
Paolo Bonzinif37afb52012-10-02 10:02:46 +020073 s->fd = monitor_get_fd(cur_mon, fdname, errp);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020074 if (s->fd == -1) {
Paolo Bonzinif37afb52012-10-02 10:02:46 +020075 return;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020076 }
77
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020078 s->get_error = fd_errno;
79 s->write = fd_write;
80 s->close = fd_close;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020081
82 migrate_fd_connect(s);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020083}
84
85static void fd_accept_incoming_migration(void *opaque)
86{
87 QEMUFile *f = opaque;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020088
Paolo Bonzinid263a202012-08-08 10:21:26 +020089 qemu_set_fd_handler2(qemu_get_fd(f), NULL, NULL, NULL, NULL);
Paolo Bonzinia6ef2902012-08-07 10:49:13 +020090 process_incoming_migration(f);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020091}
92
Paolo Bonzini43eaae22012-10-02 18:21:18 +020093void fd_start_incoming_migration(const char *infd, Error **errp)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020094{
95 int fd;
96 QEMUFile *f;
97
malcd0f2c4c2010-02-07 02:03:50 +030098 DPRINTF("Attempting to start an incoming migration via fd\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020099
100 fd = strtol(infd, NULL, 0);
101 f = qemu_fdopen(fd, "rb");
102 if(f == NULL) {
Paolo Bonzini43eaae22012-10-02 18:21:18 +0200103 error_setg_errno(errp, errno, "failed to open the source descriptor");
104 return;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200105 }
106
Juan Quintela1c39e2a2010-03-11 17:55:38 +0100107 qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200108}