migration: Move populate_vfio_info() into a separate file

The CONFIG_VFIO switch only works in target specific code. Since
migration/migration.c is common code, the #ifdef does not have
the intended behavior here. Move the related code to a separate
file now which gets compiled via specific_ss instead.

Fixes: 3710586caa ("qapi: Add VFIO devices migration stats in Migration stats")
Message-Id: <20210414112004.943383-3-thuth@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

migration/meson.build

@@ -31,4 +31,5 @@ softmmu_ss.add(when: ['CONFIG_RDMA', rdma], if_true: files('rdma.c'))
 softmmu_ss.add(when: 'CONFIG_LIVE_BLOCK_MIGRATION', if_true: files('block.c'))
 softmmu_ss.add(when: zstd, if_true: files('multifd-zstd.c'))
 
-specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: files('dirtyrate.c', 'ram.c'))
+specific_ss.add(when: 'CONFIG_SOFTMMU',
+                if_true: files('dirtyrate.c', 'ram.c', 'target.c'))

migration/migration.c

@@ -60,10 +60,6 @@
 #include "qemu/yank.h"
 #include "sysemu/cpus.h"
 
-#ifdef CONFIG_VFIO
-#include "hw/vfio/vfio-common.h"
-#endif
-
 #define MAX_THROTTLE  (128 << 20)      /* Migration transfer speed throttling */
 
 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
@@ -1059,17 +1055,6 @@ static void populate_disk_info(MigrationInfo *info)
     }
 }
 
-static void populate_vfio_info(MigrationInfo *info)
-{
-#ifdef CONFIG_VFIO
-    if (vfio_mig_active()) {
-        info->has_vfio = true;
-        info->vfio = g_malloc0(sizeof(*info->vfio));
-        info->vfio->transferred = vfio_mig_bytes_transferred();
-    }
-#endif
-}
-
 static void fill_source_migration_info(MigrationInfo *info)
 {
     MigrationState *s = migrate_get_current();

migration/migration.h

@@ -376,4 +376,6 @@ void migration_make_urgent_request(void);
 void migration_consume_urgent_request(void);
 bool migration_rate_limit(void);
 
+void populate_vfio_info(MigrationInfo *info);
+
 #endif

migration/target.c

@@ -0,0 +1,25 @@
+/*
+ * QEMU live migration - functions that need to be compiled target-specific
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2
+ * or (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/qapi-types-migration.h"
+#include "migration.h"
+
+#ifdef CONFIG_VFIO
+#include "hw/vfio/vfio-common.h"
+#endif
+
+void populate_vfio_info(MigrationInfo *info)
+{
+#ifdef CONFIG_VFIO
+    if (vfio_mig_active()) {
+        info->has_vfio = true;
+        info->vfio = g_malloc0(sizeof(*info->vfio));
+        info->vfio->transferred = vfio_mig_bytes_transferred();
+    }
+#endif
+}