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[PATCH v3 14/21] migration/block-dirty-bitmap: keep bitmap state for all
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v3 14/21] migration/block-dirty-bitmap: keep bitmap state for all bitmaps |
Date: |
Fri, 24 Jul 2020 11:43:20 +0300 |
Keep bitmap state for disabled bitmaps too. Keep the state until the
end of the process. It's needed for the following commit to implement
bitmap postcopy canceling.
To clean-up the new list the following logic is used:
We need two events to consider bitmap migration finished:
1. chunk with DIRTY_BITMAP_MIG_FLAG_COMPLETE flag should be received
2. dirty_bitmap_mig_before_vm_start should be called
These two events may come in any order, so we understand which one is
last, and on the last of them we remove bitmap migration state from the
list.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
migration/block-dirty-bitmap.c | 64 +++++++++++++++++++++++-----------
1 file changed, 43 insertions(+), 21 deletions(-)
diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index 405a259296..eb4ffeac4d 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -132,6 +132,7 @@ typedef struct LoadBitmapState {
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
bool migrated;
+ bool enabled;
} LoadBitmapState;
/* State of the dirty bitmap migration (DBM) during load process */
@@ -142,8 +143,10 @@ typedef struct DBMLoadState {
BlockDriverState *bs;
BdrvDirtyBitmap *bitmap;
- GSList *enabled_bitmaps;
- QemuMutex lock; /* protect enabled_bitmaps */
+ bool before_vm_start_handled; /* set in dirty_bitmap_mig_before_vm_start */
+
+ GSList *bitmaps;
+ QemuMutex lock; /* protect bitmaps */
} DBMLoadState;
typedef struct DBMState {
@@ -526,6 +529,7 @@ static int dirty_bitmap_load_start(QEMUFile *f,
DBMLoadState *s)
Error *local_err = NULL;
uint32_t granularity = qemu_get_be32(f);
uint8_t flags = qemu_get_byte(f);
+ LoadBitmapState *b;
if (s->bitmap) {
error_report("Bitmap with the same name ('%s') already exists on "
@@ -552,45 +556,59 @@ static int dirty_bitmap_load_start(QEMUFile *f,
DBMLoadState *s)
bdrv_disable_dirty_bitmap(s->bitmap);
if (flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED) {
- LoadBitmapState *b;
-
bdrv_dirty_bitmap_create_successor(s->bitmap, &local_err);
if (local_err) {
error_report_err(local_err);
return -EINVAL;
}
-
- b = g_new(LoadBitmapState, 1);
- b->bs = s->bs;
- b->bitmap = s->bitmap;
- b->migrated = false;
- s->enabled_bitmaps = g_slist_prepend(s->enabled_bitmaps, b);
}
+ b = g_new(LoadBitmapState, 1);
+ b->bs = s->bs;
+ b->bitmap = s->bitmap;
+ b->migrated = false;
+ b->enabled = flags & DIRTY_BITMAP_MIG_START_FLAG_ENABLED;
+
+ s->bitmaps = g_slist_prepend(s->bitmaps, b);
+
return 0;
}
-void dirty_bitmap_mig_before_vm_start(void)
+/*
+ * before_vm_start_handle_item
+ *
+ * g_slist_foreach helper
+ *
+ * item is LoadBitmapState*
+ * opaque is DBMLoadState*
+ */
+static void before_vm_start_handle_item(void *item, void *opaque)
{
- DBMLoadState *s = &dbm_state.load;
- GSList *item;
-
- qemu_mutex_lock(&s->lock);
-
- for (item = s->enabled_bitmaps; item; item = g_slist_next(item)) {
- LoadBitmapState *b = item->data;
+ DBMLoadState *s = opaque;
+ LoadBitmapState *b = item;
+ if (b->enabled) {
if (b->migrated) {
bdrv_enable_dirty_bitmap(b->bitmap);
} else {
bdrv_dirty_bitmap_enable_successor(b->bitmap);
}
+ }
+ if (b->migrated) {
+ s->bitmaps = g_slist_remove(s->bitmaps, b);
g_free(b);
}
+}
- g_slist_free(s->enabled_bitmaps);
- s->enabled_bitmaps = NULL;
+void dirty_bitmap_mig_before_vm_start(void)
+{
+ DBMLoadState *s = &dbm_state.load;
+ qemu_mutex_lock(&s->lock);
+
+ assert(!s->before_vm_start_handled);
+ g_slist_foreach(s->bitmaps, before_vm_start_handle_item, s);
+ s->before_vm_start_handled = true;
qemu_mutex_unlock(&s->lock);
}
@@ -607,11 +625,15 @@ static void dirty_bitmap_load_complete(QEMUFile *f,
DBMLoadState *s)
bdrv_reclaim_dirty_bitmap(s->bitmap, &error_abort);
}
- for (item = s->enabled_bitmaps; item; item = g_slist_next(item)) {
+ for (item = s->bitmaps; item; item = g_slist_next(item)) {
LoadBitmapState *b = item->data;
if (b->bitmap == s->bitmap) {
b->migrated = true;
+ if (s->before_vm_start_handled) {
+ s->bitmaps = g_slist_remove(s->bitmaps, b);
+ g_free(b);
+ }
break;
}
}
--
2.21.0
- [PATCH v3 10/21] migration/block-dirty-bitmap: move mutex init to dirty_bitmap_mig_init, (continued)
- [PATCH v3 10/21] migration/block-dirty-bitmap: move mutex init to dirty_bitmap_mig_init, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 18/21] qemu-iotests/199: prepare for new test-cases addition, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 19/21] qemu-iotests/199: check persistent bitmaps, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 11/21] migration/block-dirty-bitmap: refactor state global variables, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 20/21] qemu-iotests/199: add early shutdown case to bitmaps postcopy, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 13/21] migration/block-dirty-bitmap: simplify dirty_bitmap_load_complete, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 12/21] migration/block-dirty-bitmap: rename finish_lock to just lock, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 14/21] migration/block-dirty-bitmap: keep bitmap state for all bitmaps,
Vladimir Sementsov-Ogievskiy <=
- [PATCH v3 21/21] qemu-iotests/199: add source-killed case to bitmaps postcopy, Vladimir Sementsov-Ogievskiy, 2020/07/24
- [PATCH v3 15/21] migration/block-dirty-bitmap: relax error handling in incoming part, Vladimir Sementsov-Ogievskiy, 2020/07/24
- Re: [PATCH v3 15/21] migration/block-dirty-bitmap: relax error handling in incoming part, Dr. David Alan Gilbert, 2020/07/27
[PATCH v3 16/21] migration/block-dirty-bitmap: cancel migration on shutdown, Vladimir Sementsov-Ogievskiy, 2020/07/24