docs/nvdimm: add example on persistent backend setup

[mirror_qemu.git] / migration / migration.h

diff --git a/migration/migration.h b/migration/migration.h
index 780a096857e3a8f37dfc0f68199df892e8cc1730..4f2fe193dc563c573eda64c6659d4f9f71d419b2 100644 (file)
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -14,12 +14,11 @@
 #ifndef QEMU_MIGRATION_H
 #define QEMU_MIGRATION_H
 
-#include "qemu-common.h"
+#include "exec/cpu-common.h"
+#include "hw/qdev-core.h"
 #include "qapi/qapi-types-migration.h"
 #include "qemu/thread.h"
-#include "exec/cpu-common.h"
 #include "qemu/coroutine_int.h"
-#include "hw/qdev.h"
 #include "io/channel.h"
 #include "net/announce.h"
 
@@ -27,6 +26,23 @@ struct PostcopyBlocktimeContext;
 
 #define  MIGRATION_RESUME_ACK_VALUE  (1)
 
+/*
+ * 1<<6=64 pages -> 256K chunk when page size is 4K.  This gives us
+ * the benefit that all the chunks are 64 pages aligned then the
+ * bitmaps are always aligned to LONG.
+ */
+#define CLEAR_BITMAP_SHIFT_MIN             6
+/*
+ * 1<<18=256K pages -> 1G chunk when page size is 4K.  This is the
+ * default value to use if no one specified.
+ */
+#define CLEAR_BITMAP_SHIFT_DEFAULT        18
+/*
+ * 1<<31=2G pages -> 8T chunk when page size is 4K.  This should be
+ * big enough and make sure we won't overflow easily.
+ */
+#define CLEAR_BITMAP_SHIFT_MAX            31
+
 /* State for the incoming migration */
 struct MigrationIncomingState {
     QEMUFile *from_src_file;
@@ -116,7 +132,6 @@ struct MigrationState
     DeviceState parent_obj;
 
     /*< public >*/
-    size_t bytes_xfer;
     QemuThread thread;
     QEMUBH *cleanup_bh;
     QEMUFile *to_dst_file;
@@ -233,6 +248,16 @@ struct MigrationState
      * do not trigger spurious decompression errors.
      */
     bool decompress_error_check;
+
+    /*
+     * This decides the size of guest memory chunk that will be used
+     * to track dirty bitmap clearing.  The size of memory chunk will
+     * be GUEST_PAGE_SIZE << N.  Say, N=0 means we will clear dirty
+     * bitmap for each page to send (1<<0=1); N=10 means we will clear
+     * dirty bitmap only once for 1<<10=1K continuous guest pages
+     * (which is in 4M chunk).
+     */
+    uint8_t clear_bitmap_shift;
 };
 
 void migrate_set_state(int *state, int old_state, int new_state);
@@ -265,6 +290,7 @@ bool migrate_postcopy_ram(void);
 bool migrate_zero_blocks(void);
 bool migrate_dirty_bitmaps(void);
 bool migrate_ignore_shared(void);
+bool migrate_validate_uuid(void);
 
 bool migrate_auto_converge(void);
 bool migrate_use_multifd(void);