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-rw-r--r--include/sysemu/replay.h3
-rw-r--r--migration/savevm.c13
-rw-r--r--replay/replay-snapshot.c6
3 files changed, 22 insertions, 0 deletions
diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h
index c0204e641c..401de12130 100644
--- a/include/sysemu/replay.h
+++ b/include/sysemu/replay.h
@@ -166,5 +166,8 @@ void replay_audio_in(int *recorded, void *samples, int *wpos, int size);
/*! Called at the start of execution.
Loads or saves initial vmstate depending on execution mode. */
void replay_vmstate_init(void);
+/*! Called to ensure that replay state is consistent and VM snapshot
+ can be created */
+bool replay_can_snapshot(void);
#endif
diff --git a/migration/savevm.c b/migration/savevm.c
index 358c5b51e2..fbeac658c1 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -54,6 +54,7 @@
#include "qemu/cutils.h"
#include "io/channel-buffer.h"
#include "io/channel-file.h"
+#include "sysemu/replay.h"
#ifndef ETH_P_RARP
#define ETH_P_RARP 0x8035
@@ -2197,6 +2198,12 @@ int save_snapshot(const char *name, Error **errp)
struct tm tm;
AioContext *aio_context;
+ if (!replay_can_snapshot()) {
+ error_report("Record/replay does not allow making snapshot "
+ "right now. Try once more later.");
+ return ret;
+ }
+
if (!bdrv_all_can_snapshot(&bs)) {
error_setg(errp, "Device '%s' is writable but does not support "
"snapshots", bdrv_get_device_name(bs));
@@ -2388,6 +2395,12 @@ int load_snapshot(const char *name, Error **errp)
AioContext *aio_context;
MigrationIncomingState *mis = migration_incoming_get_current();
+ if (!replay_can_snapshot()) {
+ error_report("Record/replay does not allow loading snapshot "
+ "right now. Try once more later.");
+ return -EINVAL;
+ }
+
if (!bdrv_all_can_snapshot(&bs)) {
error_setg(errp,
"Device '%s' is writable but does not support snapshots",
diff --git a/replay/replay-snapshot.c b/replay/replay-snapshot.c
index b2e10769a6..7075986ab5 100644
--- a/replay/replay-snapshot.c
+++ b/replay/replay-snapshot.c
@@ -83,3 +83,9 @@ void replay_vmstate_init(void)
}
}
}
+
+bool replay_can_snapshot(void)
+{
+ return replay_mode == REPLAY_MODE_NONE
+ || !replay_has_events();
+}