blob: 66d51c1cc0a242d8cef4010e9161a3e01b90b9ed [file] [log] [blame]
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 *
12 */
13
14#include "qemu-common.h"
15#include "qemu_socket.h"
16#include "migration.h"
17#include "monitor.h"
18#include "qemu-char.h"
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020019#include "buffered_file.h"
20#include "block.h"
21#include "qemu_socket.h"
22
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
33static int fd_errno(FdMigrationState *s)
34{
35 return errno;
36}
37
38static int fd_write(FdMigrationState *s, const void * buf, size_t size)
39{
40 return write(s->fd, buf, size);
41}
42
43static int fd_close(FdMigrationState *s)
44{
malcd0f2c4c2010-02-07 02:03:50 +030045 DPRINTF("fd_close\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020046 if (s->fd != -1) {
47 close(s->fd);
48 s->fd = -1;
49 }
50 return 0;
51}
52
53MigrationState *fd_start_outgoing_migration(Monitor *mon,
54 const char *fdname,
55 int64_t bandwidth_limit,
lirans@il.ibm.comc163b5c2009-11-02 15:40:58 +020056 int detach,
57 int blk,
58 int inc)
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020059{
60 FdMigrationState *s;
61
62 s = qemu_mallocz(sizeof(*s));
63
64 s->fd = monitor_get_fd(mon, fdname);
65 if (s->fd == -1) {
malcd0f2c4c2010-02-07 02:03:50 +030066 DPRINTF("fd_migration: invalid file descriptor identifier\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020067 goto err_after_alloc;
68 }
69
70 if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
malcd0f2c4c2010-02-07 02:03:50 +030071 DPRINTF("Unable to set nonblocking mode on file descriptor\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020072 goto err_after_open;
73 }
74
75 s->get_error = fd_errno;
76 s->write = fd_write;
77 s->close = fd_close;
78 s->mig_state.cancel = migrate_fd_cancel;
79 s->mig_state.get_status = migrate_fd_get_status;
80 s->mig_state.release = migrate_fd_release;
81
lirans@il.ibm.comc163b5c2009-11-02 15:40:58 +020082 s->mig_state.blk = blk;
83 s->mig_state.shared = inc;
Jan Kiszkaf327aa02009-11-30 18:21:21 +010084
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020085 s->state = MIG_STATE_ACTIVE;
Jan Kiszkaf327aa02009-11-30 18:21:21 +010086 s->mon = NULL;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020087 s->bandwidth_limit = bandwidth_limit;
88
Jan Kiszkaf327aa02009-11-30 18:21:21 +010089 if (!detach) {
90 migrate_fd_monitor_suspend(s, mon);
91 }
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +020092
93 migrate_fd_connect(s);
94 return &s->mig_state;
95
96err_after_open:
97 close(s->fd);
98err_after_alloc:
99 qemu_free(s);
100 return NULL;
101}
102
103static void fd_accept_incoming_migration(void *opaque)
104{
105 QEMUFile *f = opaque;
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200106
Juan Quintela511c0232010-06-09 14:10:55 +0200107 process_incoming_migration(f);
Juan Quintelacfaf6d32010-03-10 00:10:35 +0100108 qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200109 qemu_fclose(f);
110}
111
112int fd_start_incoming_migration(const char *infd)
113{
114 int fd;
115 QEMUFile *f;
116
malcd0f2c4c2010-02-07 02:03:50 +0300117 DPRINTF("Attempting to start an incoming migration via fd\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200118
119 fd = strtol(infd, NULL, 0);
120 f = qemu_fdopen(fd, "rb");
121 if(f == NULL) {
malcd0f2c4c2010-02-07 02:03:50 +0300122 DPRINTF("Unable to apply qemu wrapper to file descriptor\n");
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200123 return -errno;
124 }
125
Juan Quintela1c39e2a2010-03-11 17:55:38 +0100126 qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f);
Paolo Bonzini5ac1fad2009-08-18 15:56:25 +0200127
128 return 0;
129}