migration: Create migration_ioc_process_incoming()

We pass the ioc instead of the fd.  This will allow us to have more
than one channel open.  We also make sure that we set the
from_src_file sooner, so we don't need to pass it as a parameter.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

--

Do not assing mis->from_src_file (peterxu)

migration/channel.c

@@ -36,8 +36,7 @@ void migration_channel_process_incoming(QIOChannel *ioc)
             error_report_err(local_err);
         }
     } else {
-        QEMUFile *f = qemu_fopen_channel_input(ioc);
+        migration_ioc_process_incoming(ioc);
-        migration_fd_process_incoming(f);
     }
 }
 

migration/migration.c

@@ -306,17 +306,16 @@ static void process_incoming_migration_bh(void *opaque)
 
 static void process_incoming_migration_co(void *opaque)
 {
-    QEMUFile *f = opaque;
     MigrationIncomingState *mis = migration_incoming_get_current();
     PostcopyState ps;
     int ret;
 
-    mis->from_src_file = f;
+    assert(mis->from_src_file);
     mis->largest_page_size = qemu_ram_pagesize_largest();
     postcopy_state_set(POSTCOPY_INCOMING_NONE);
     migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
                       MIGRATION_STATUS_ACTIVE);
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(mis->from_src_file);
 
     ps = postcopy_state_get();
     trace_process_incoming_migration_co_end(ret, ps);
@@ -364,12 +363,27 @@ static void process_incoming_migration_co(void *opaque)
 
 void migration_fd_process_incoming(QEMUFile *f)
 {
-    Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f);
+    Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
+    MigrationIncomingState *mis = migration_incoming_get_current();
 
+    if (!mis->from_src_file) {
+        mis->from_src_file = f;
+    }
     qemu_file_set_blocking(f, false);
     qemu_coroutine_enter(co);
 }
 
+void migration_ioc_process_incoming(QIOChannel *ioc)
+{
+    MigrationIncomingState *mis = migration_incoming_get_current();
+
+    if (!mis->from_src_file) {
+        QEMUFile *f = qemu_fopen_channel_input(ioc);
+        migration_fd_process_incoming(f);
+    }
+    /* We still only have a single channel.  Nothing to do here yet */
+}
+
 /*
  * Send a 'SHUT' message on the return channel with the given value
  * to indicate that we've finished with the RP.  Non-0 value indicates

migration/migration.h

@@ -20,6 +20,7 @@
 #include "exec/cpu-common.h"
 #include "qemu/coroutine_int.h"
 #include "hw/qdev.h"
+#include "io/channel.h"
 
 /* State for the incoming migration */
 struct MigrationIncomingState {
@@ -152,6 +153,7 @@ struct MigrationState
 void migrate_set_state(int *state, int old_state, int new_state);
 
 void migration_fd_process_incoming(QEMUFile *f);
+void migration_ioc_process_incoming(QIOChannel *ioc);
 
 uint64_t migrate_max_downtime(void);