[Qemu-devel] [PATCH] migrate: Migration aborts abruptly for machine "none"

[Ashijeet Acharya]

Migration of a "none" machine with no RAM crashes abruptly as
bitmap_new() fails and thus aborts. Instead, place a check for
last_ram_offset() being '0' at the start of ram_save_setup() and
error out with a meaningful error message.

Signed-off-by: Ashijeet Acharya <address@hidden>
---
 migration/ram.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/migration/ram.c b/migration/ram.c
index ef8fadf..bf05d69 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1947,6 +1947,11 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
 {
     RAMBlock *block;
 
+    if (last_ram_offset() == 0) {
+        error_report("Failed to migrate: No RAM available!");
+        return -1;
+    }
+
     /* migration has already setup the bitmap, reuse it. */
     if (!migration_in_colo_state()) {
         if (ram_save_init_globals() < 0) {
-- 
2.6.2