migration/rdma: Plug a memory leak and improve a message

When migration capability @rdma-pin-all is true, but the server cannot
honor it, qemu_rdma_connect() calls macro ERROR(), then returns
success.

ERROR() sets an error.  Since qemu_rdma_connect() returns success, its
caller rdma_start_outgoing_migration() duly assumes @errp is still
clear.  The Error object leaks.

ERROR() additionally reports the situation to the user as an error:

    RDMA ERROR: Server cannot support pinning all memory. Will register memory dynamically.

Is this an error or not?  It actually isn't; we disable @rdma-pin-all
and carry on.  "Correcting" the user's configuration decisions that
way feels problematic, but that's a topic for another day.

Replace ERROR() by warn_report().  This plugs the memory leak, and
emits a clearer message to the user.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230928132019.2544702-31-armbru@redhat.com>

diff --git a/migration/rdma.c b/migration/rdma.c
index b0125b01cf8038fb483f99bd4c0fc4f1bf553e45..00e3c430f4fcc340b2cd1383b15cdf82af5c6ccb 100644 (file)
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2637,8 +2637,8 @@ static int qemu_rdma_connect(RDMAContext *rdma, bool return_path,
      * and disable them otherwise.
      */
     if (rdma->pin_all && !(cap.flags & RDMA_CAPABILITY_PIN_ALL)) {
-        ERROR(errp, "Server cannot support pinning all memory. "
-                        "Will register memory dynamically.");
+        warn_report("RDMA: Server cannot support pinning all memory. "
+                    "Will register memory dynamically.");
         rdma->pin_all = false;
     }