Block live migration
This patch introduces block migration called during live migration. Block
are being copied to the destination in an async way. First the code will
transfer the whole disk and then transfer all dirty blocks accumulted during
the migration.
Still need to improve transition from the iterative phase of migration to the
end phase. For now transition will take place when all blocks transfered once,
all the dirty blocks will be transfered during the end phase (guest is
suspended).
Changes from v4:
- Global variabels moved to a global state structure allocated dynamically.
- Minor coding style issues.
- Poll block.c for tracking of dirty blocks instead of manage it here.
Signed-off-by: Liran Schour <lirans@il.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index 18353f2..c3f3c8f 100644
--- a/vl.c
+++ b/vl.c
@@ -148,6 +148,8 @@
#include "qemu-char.h"
#include "cache-utils.h"
#include "block.h"
+#include "block_int.h"
+#include "block-migration.h"
#include "dma.h"
#include "audio/audio.h"
#include "migration.h"
@@ -2972,9 +2974,7 @@
bwidth = 0.000001;
/* try transferring iterative blocks of memory */
-
if (stage == 3) {
-
/* flush all remaining blocks regardless of rate limiting */
while (ram_save_block(f) != 0) {
bytes_transferred += TARGET_PAGE_SIZE;
@@ -5553,6 +5553,8 @@
bdrv_init_with_whitelist();
+ blk_mig_init();
+
/* we always create the cdrom drive, even if no disk is there */
drive_add(NULL, CDROM_ALIAS);
@@ -5569,7 +5571,8 @@
exit(1);
vmstate_register(0, &vmstate_timers ,&timers_state);
- register_savevm_live("ram", 0, 3, ram_save_live, NULL, ram_load, NULL);
+ register_savevm_live("ram", 0, 3, NULL, ram_save_live, NULL,
+ ram_load, NULL);
/* Maintain compatibility with multiple stdio monitors */
if (!strcmp(monitor_devices[0],"stdio")) {
