213 lines
6.7 KiB
Diff
213 lines
6.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Stefan Reiter <s.reiter@proxmox.com>
|
|
Date: Thu, 22 Oct 2020 17:34:18 +0200
|
|
Subject: [PATCH] PVE: Migrate dirty bitmap state via savevm
|
|
|
|
QEMU provides 'savevm' registrations as a mechanism for arbitrary state
|
|
to be migrated along with a VM. Use this to send a serialized version of
|
|
dirty bitmap state data from proxmox-backup-qemu, and restore it on the
|
|
target node.
|
|
|
|
Also add a flag to query-proxmox-support so qemu-server can determine if
|
|
safe migration is possible and makes sense.
|
|
|
|
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
|
|
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
|
|
---
|
|
include/migration/misc.h | 3 ++
|
|
migration/meson.build | 2 +
|
|
migration/migration.c | 1 +
|
|
migration/pbs-state.c | 106 +++++++++++++++++++++++++++++++++++++++
|
|
pve-backup.c | 1 +
|
|
qapi/block-core.json | 6 +++
|
|
6 files changed, 119 insertions(+)
|
|
create mode 100644 migration/pbs-state.c
|
|
|
|
diff --git a/include/migration/misc.h b/include/migration/misc.h
|
|
index 465906710d..4f0aeceb6f 100644
|
|
--- a/include/migration/misc.h
|
|
+++ b/include/migration/misc.h
|
|
@@ -75,4 +75,7 @@ bool migration_in_bg_snapshot(void);
|
|
/* migration/block-dirty-bitmap.c */
|
|
void dirty_bitmap_mig_init(void);
|
|
|
|
+/* migration/pbs-state.c */
|
|
+void pbs_state_mig_init(void);
|
|
+
|
|
#endif
|
|
diff --git a/migration/meson.build b/migration/meson.build
|
|
index 0842d00cd2..d012f4d8d3 100644
|
|
--- a/migration/meson.build
|
|
+++ b/migration/meson.build
|
|
@@ -6,8 +6,10 @@ migration_files = files(
|
|
'vmstate.c',
|
|
'qemu-file.c',
|
|
'yank_functions.c',
|
|
+ 'pbs-state.c',
|
|
)
|
|
softmmu_ss.add(migration_files)
|
|
+softmmu_ss.add(libproxmox_backup_qemu)
|
|
|
|
softmmu_ss.add(files(
|
|
'block-dirty-bitmap.c',
|
|
diff --git a/migration/migration.c b/migration/migration.c
|
|
index bb8bbddfe4..8109e468eb 100644
|
|
--- a/migration/migration.c
|
|
+++ b/migration/migration.c
|
|
@@ -229,6 +229,7 @@ void migration_object_init(void)
|
|
blk_mig_init();
|
|
ram_mig_init();
|
|
dirty_bitmap_mig_init();
|
|
+ pbs_state_mig_init();
|
|
}
|
|
|
|
void migration_cancel(const Error *error)
|
|
diff --git a/migration/pbs-state.c b/migration/pbs-state.c
|
|
new file mode 100644
|
|
index 0000000000..29f2b3860d
|
|
--- /dev/null
|
|
+++ b/migration/pbs-state.c
|
|
@@ -0,0 +1,106 @@
|
|
+/*
|
|
+ * PBS (dirty-bitmap) state migration
|
|
+ */
|
|
+
|
|
+#include "qemu/osdep.h"
|
|
+#include "migration/misc.h"
|
|
+#include "qemu-file.h"
|
|
+#include "migration/vmstate.h"
|
|
+#include "migration/register.h"
|
|
+#include "proxmox-backup-qemu.h"
|
|
+
|
|
+typedef struct PBSState {
|
|
+ bool active;
|
|
+} PBSState;
|
|
+
|
|
+/* state is accessed via this static variable directly, 'opaque' is NULL */
|
|
+static PBSState pbs_state;
|
|
+
|
|
+static void pbs_state_save_pending(QEMUFile *f, void *opaque,
|
|
+ uint64_t max_size,
|
|
+ uint64_t *res_precopy_only,
|
|
+ uint64_t *res_compatible,
|
|
+ uint64_t *res_postcopy_only)
|
|
+{
|
|
+ /* we send everything in save_setup, so nothing is ever pending */
|
|
+}
|
|
+
|
|
+/* receive PBS state via f and deserialize, called on target */
|
|
+static int pbs_state_load(QEMUFile *f, void *opaque, int version_id)
|
|
+{
|
|
+ /* safe cast, we cannot migrate to target with less bits than source */
|
|
+ size_t buf_size = (size_t)qemu_get_be64(f);
|
|
+
|
|
+ uint8_t *buf = (uint8_t *)malloc(buf_size);
|
|
+ size_t read = qemu_get_buffer(f, buf, buf_size);
|
|
+
|
|
+ if (read < buf_size) {
|
|
+ fprintf(stderr, "error receiving PBS state: not enough data\n");
|
|
+ return -EIO;
|
|
+ }
|
|
+
|
|
+ proxmox_import_state(buf, buf_size);
|
|
+
|
|
+ free(buf);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/* serialize PBS state and send to target via f, called on source */
|
|
+static int pbs_state_save_setup(QEMUFile *f, void *opaque)
|
|
+{
|
|
+ size_t buf_size;
|
|
+ uint8_t *buf = proxmox_export_state(&buf_size);
|
|
+
|
|
+ /* LV encoding */
|
|
+ qemu_put_be64(f, buf_size);
|
|
+ qemu_put_buffer(f, buf, buf_size);
|
|
+
|
|
+ proxmox_free_state_buf(buf);
|
|
+ pbs_state.active = false;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static bool pbs_state_is_active(void *opaque)
|
|
+{
|
|
+ /* we need to return active exactly once, else .save_setup is never called,
|
|
+ * but if we'd just return true the migration doesn't make progress since
|
|
+ * it'd be waiting for us */
|
|
+ return pbs_state.active;
|
|
+}
|
|
+
|
|
+static bool pbs_state_is_active_iterate(void *opaque)
|
|
+{
|
|
+ /* we don't iterate, everything is sent in save_setup */
|
|
+ return pbs_state_is_active(opaque);
|
|
+}
|
|
+
|
|
+static bool pbs_state_has_postcopy(void *opaque)
|
|
+{
|
|
+ /* PBS state can't change during a migration (since that's blocking any
|
|
+ * potential backups), so we can copy everything before the VM is stopped */
|
|
+ return false;
|
|
+}
|
|
+
|
|
+static void pbs_state_save_cleanup(void *opaque)
|
|
+{
|
|
+ /* reset active after migration succeeds or fails */
|
|
+ pbs_state.active = false;
|
|
+}
|
|
+
|
|
+static SaveVMHandlers savevm_pbs_state_handlers = {
|
|
+ .save_setup = pbs_state_save_setup,
|
|
+ .has_postcopy = pbs_state_has_postcopy,
|
|
+ .save_live_pending = pbs_state_save_pending,
|
|
+ .is_active_iterate = pbs_state_is_active_iterate,
|
|
+ .load_state = pbs_state_load,
|
|
+ .is_active = pbs_state_is_active,
|
|
+ .save_cleanup = pbs_state_save_cleanup,
|
|
+};
|
|
+
|
|
+void pbs_state_mig_init(void)
|
|
+{
|
|
+ pbs_state.active = true;
|
|
+ register_savevm_live("pbs-state", 0, 1,
|
|
+ &savevm_pbs_state_handlers,
|
|
+ NULL);
|
|
+}
|
|
diff --git a/pve-backup.c b/pve-backup.c
|
|
index 6f05796fad..5fa3cc1352 100644
|
|
--- a/pve-backup.c
|
|
+++ b/pve-backup.c
|
|
@@ -1132,6 +1132,7 @@ ProxmoxSupportStatus *qmp_query_proxmox_support(Error **errp)
|
|
ret->pbs_library_version = g_strdup(proxmox_backup_qemu_version());
|
|
ret->pbs_dirty_bitmap = true;
|
|
ret->pbs_dirty_bitmap_savevm = true;
|
|
+ ret->pbs_dirty_bitmap_migration = true;
|
|
ret->query_bitmap_info = true;
|
|
return ret;
|
|
}
|
|
diff --git a/qapi/block-core.json b/qapi/block-core.json
|
|
index cb17d00fe0..bd978ea562 100644
|
|
--- a/qapi/block-core.json
|
|
+++ b/qapi/block-core.json
|
|
@@ -879,6 +879,11 @@
|
|
# @pbs-dirty-bitmap-savevm: True if 'dirty-bitmaps' migration capability can
|
|
# safely be set for savevm-async.
|
|
#
|
|
+# @pbs-dirty-bitmap-migration: True if safe migration of dirty-bitmaps including
|
|
+# PBS state is supported. Enabling 'dirty-bitmaps'
|
|
+# migration cap if this is false/unset may lead
|
|
+# to crashes on migration!
|
|
+#
|
|
# @pbs-library-version: Running version of libproxmox-backup-qemu0 library.
|
|
#
|
|
##
|
|
@@ -886,6 +891,7 @@
|
|
'data': { 'pbs-dirty-bitmap': 'bool',
|
|
'query-bitmap-info': 'bool',
|
|
'pbs-dirty-bitmap-savevm': 'bool',
|
|
+ 'pbs-dirty-bitmap-migration': 'bool',
|
|
'pbs-library-version': 'str' } }
|
|
|
|
##
|