Migration to file, reuses migration-to-fd.
Migration from file, uses qemu-fopen directly.
The saved state-file should be used only once and removed (or used
with -snapshot, or a the disk-image should be copied), as the
disk image is not saved, only the VM state.
Also there is not point of doing a _live_ migration to file (except
for debugging migration code), so I recommend to stop the VM before
migrating its state to a file.
An advantage migration-to-file over savevm/loadvm is that for the latter
a qcow2 is a requirement, while the former works for any image-format.
Signed-off-by: Uri Lublin <address@hidden>
---
Makefile | 2 +-
migration-file.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
migration.c | 4 ++
migration.h | 5 ++
4 files changed, 137 insertions(+), 1 deletions(-)
create mode 100644 migration-file.c
diff --git a/Makefile b/Makefile
index 8cbdcda..7e0e6f2 100644
--- a/Makefile
+++ b/Makefile
@@ -81,7 +81,7 @@ OBJS+=usb.o usb-hub.o usb-$(HOST_USB).o usb-hid.o usb-msd.o
usb-wacom.o
OBJS+=usb-serial.o usb-net.o
OBJS+=sd.o ssi-sd.o
OBJS+=bt.o bt-host.o bt-vhci.o bt-l2cap.o bt-sdp.o bt-hci.o bt-hid.o usb-bt.o
-OBJS+=buffered_file.o migration.o migration-tcp.o net.o qemu-sockets.o
+OBJS+=buffered_file.o migration.o migration-tcp.o migration-file.o net.o
qemu-sockets.o
OBJS+=qemu-char.o aio.o net-checksum.o savevm.o cache-utils.o
ifdef CONFIG_BRLAPI
diff --git a/migration-file.c b/migration-file.c
new file mode 100644
index 0000000..5cde3e2
--- /dev/null
+++ b/migration-file.c
@@ -0,0 +1,127 @@
+/*
+ * QEMU live migration
+ *
+ * Copyright IBM, Corp. 2008
+ * Red Hat, Inc. 2008
+ *
+ * Authors:
+ * Anthony Liguori <address@hidden>
+ * Uri Lublin <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <unistd.h>
+#include "qemu-common.h"
+#include "migration.h"
+#include "sysemu.h"
+#include "console.h"
+#include "block.h"
+
+//#define DEBUG_MIGRATION_FILE
+
+#ifdef DEBUG_MIGRATION_FILE
+#define dprintf(fmt, ...) \
+ do { printf("migration-file: " fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+ do { } while (0)
+#endif
+
+static int file_close(FdMigrationState *s)
+{
+ close(s->fd);
+}
+
+static int file_errno(FdMigrationState *s)
+{
+ return errno;
+}
+
+static int file_write(FdMigrationState *s, const void * buf, size_t size)
+{
+ return write(s->fd, buf, size);
+}
+
+MigrationState *file_start_outgoing_migration(const char *filename,
+ int64_t bandwidth_limit,
+ int async)
+{
+ FdMigrationState *s;
+ int fd;
+
+ s = qemu_mallocz(sizeof(*s));
+ if (s == NULL) {
+ perror("file_migration: qemu_mallocz failed");
+ term_printf("file_migration: qemu_mallocz failed");
+ goto err1;
+ }
+
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ perror("file_migration: failed to open filename");
+ term_printf("file_migration: failed to open filename %s\n", filename);
+ goto err2;
+ }