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[Qemu-devel] [PATCH v8 23/24] migration/qmp: add command migrate-pause
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v8 23/24] migration/qmp: add command migrate-pause |
Date: |
Wed, 2 May 2018 18:47:39 +0800 |
It pauses an ongoing migration. Currently it only supports postcopy.
Note that this command will work on either side of the migration.
Basically when we trigger this on one side, it'll interrupt the other
side as well since the other side will get notified on the disconnect
event.
However, it's still possible that the other side is not notified, for
example, when the network is totally broken, or due to some firewall
configuration changes. In that case, we will also need to run the same
command on the other side so both sides will go into the paused state.
Signed-off-by: Peter Xu <address@hidden>
---
qapi/migration.json | 16 ++++++++++++++++
migration/migration.c | 29 +++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/qapi/migration.json b/qapi/migration.json
index a1c2c238ab..bf403d2dd2 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1211,3 +1211,19 @@
##
{ 'command': 'migrate-recover', 'data': { 'uri': 'str' },
'allow-oob': true }
+
+##
+# @migrate-pause:
+#
+# Pause a migration. Currently it only supports postcopy.
+#
+# Returns: nothing.
+#
+# Example:
+#
+# -> { "execute": "migrate-pause" }
+# <- { "return": {} }
+#
+# Since: 2.12
+##
+{ 'command': 'migrate-pause', 'allow-oob': true }
diff --git a/migration/migration.c b/migration/migration.c
index 25f26052d2..03e4950976 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1502,6 +1502,35 @@ void qmp_migrate_recover(const char *uri, Error **errp)
qemu_start_incoming_migration(uri, errp);
}
+void qmp_migrate_pause(Error **errp)
+{
+ MigrationState *ms = migrate_get_current();
+ MigrationIncomingState *mis = migration_incoming_get_current();
+ int ret;
+
+ if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
+ /* Source side, during postcopy */
+ qemu_mutex_lock(&ms->qemu_file_lock);
+ ret = qemu_file_shutdown(ms->to_dst_file);
+ qemu_mutex_unlock(&ms->qemu_file_lock);
+ if (ret) {
+ error_setg(errp, "Failed to pause source migration");
+ }
+ return;
+ }
+
+ if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
+ ret = qemu_file_shutdown(mis->from_src_file);
+ if (ret) {
+ error_setg(errp, "Failed to pause destination migration");
+ }
+ return;
+ }
+
+ error_setg(errp, "migrate-pause is currently only supported "
+ "during postcopy-active state");
+}
+
bool migration_is_blocked(Error **errp)
{
if (qemu_savevm_state_blocked(errp)) {
--
2.14.3
- [Qemu-devel] [PATCH v8 15/24] migration: introduce SaveVMHandlers.resume_prepare, (continued)
- [Qemu-devel] [PATCH v8 15/24] migration: introduce SaveVMHandlers.resume_prepare, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 16/24] migration: synchronize dirty bitmap for resume, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 17/24] migration: setup ramstate for resume, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 18/24] migration: final handshake for the resume, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 19/24] migration: init dst in migration_object_init too, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 20/24] qmp/migration: new command migrate-recover, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 21/24] hmp/migration: add migrate_recover command, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 22/24] migration: introduce lock for to_dst_file, Peter Xu, 2018/05/02
- [Qemu-devel] [PATCH v8 23/24] migration/qmp: add command migrate-pause,
Peter Xu <=
- [Qemu-devel] [PATCH v8 24/24] migration/hmp: add migrate_pause command, Peter Xu, 2018/05/02