vfio: Make vfio_un/block_multiple_devices_migration() static

Both of these routines are only used in file "migration.c". Move them
there.

Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/qemu-devel/20250318095415.670319-5-clg@redhat.com
Reviewed-by: John Levon <john.levon@nutanix.com>
Link: https://lore.kernel.org/qemu-devel/20250326075122.1299361-5-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/vfio/common.c

@@ -40,7 +40,6 @@
 #include "trace.h"
 #include "qapi/error.h"
 #include "migration/misc.h"
-#include "migration/blocker.h"
 #include "migration/qemu-file.h"
 #include "system/tcg.h"
 #include "system/tpm.h"
@@ -65,64 +64,6 @@ int vfio_kvm_device_fd = -1;
  * Device state interfaces
  */
 
-static Error *multiple_devices_migration_blocker;
-
-/*
- * Multiple devices migration is allowed only if all devices support P2P
- * migration. Single device migration is allowed regardless of P2P migration
- * support.
- */
-static bool vfio_multiple_devices_migration_is_supported(void)
-{
-    VFIODevice *vbasedev;
-    unsigned int device_num = 0;
-    bool all_support_p2p = true;
-
-    QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
-        if (vbasedev->migration) {
-            device_num++;
-
-            if (!(vbasedev->migration->mig_flags & VFIO_MIGRATION_P2P)) {
-                all_support_p2p = false;
-            }
-        }
-    }
-
-    return all_support_p2p || device_num <= 1;
-}
-
-int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
-{
-    if (vfio_multiple_devices_migration_is_supported()) {
-        return 0;
-    }
-
-    if (vbasedev->enable_migration == ON_OFF_AUTO_ON) {
-        error_setg(errp, "Multiple VFIO devices migration is supported only if "
-                         "all of them support P2P migration");
-        return -EINVAL;
-    }
-
-    if (multiple_devices_migration_blocker) {
-        return 0;
-    }
-
-    error_setg(&multiple_devices_migration_blocker,
-               "Multiple VFIO devices migration is supported only if all of "
-               "them support P2P migration");
-    return migrate_add_blocker_normal(&multiple_devices_migration_blocker,
-                                      errp);
-}
-
-void vfio_unblock_multiple_devices_migration(void)
-{
-    if (!multiple_devices_migration_blocker ||
-        !vfio_multiple_devices_migration_is_supported()) {
-        return;
-    }
-
-    migrate_del_blocker(&multiple_devices_migration_blocker);
-}
 
 bool vfio_viommu_preset(VFIODevice *vbasedev)
 {

hw/vfio/migration.c

@@ -1022,6 +1022,65 @@ static int vfio_migration_init(VFIODevice *vbasedev)
     return 0;
 }
 
+static Error *multiple_devices_migration_blocker;
+
+/*
+ * Multiple devices migration is allowed only if all devices support P2P
+ * migration. Single device migration is allowed regardless of P2P migration
+ * support.
+ */
+static bool vfio_multiple_devices_migration_is_supported(void)
+{
+    VFIODevice *vbasedev;
+    unsigned int device_num = 0;
+    bool all_support_p2p = true;
+
+    QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
+        if (vbasedev->migration) {
+            device_num++;
+
+            if (!(vbasedev->migration->mig_flags & VFIO_MIGRATION_P2P)) {
+                all_support_p2p = false;
+            }
+        }
+    }
+
+    return all_support_p2p || device_num <= 1;
+}
+
+static int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
+{
+    if (vfio_multiple_devices_migration_is_supported()) {
+        return 0;
+    }
+
+    if (vbasedev->enable_migration == ON_OFF_AUTO_ON) {
+        error_setg(errp, "Multiple VFIO devices migration is supported only if "
+                         "all of them support P2P migration");
+        return -EINVAL;
+    }
+
+    if (multiple_devices_migration_blocker) {
+        return 0;
+    }
+
+    error_setg(&multiple_devices_migration_blocker,
+               "Multiple VFIO devices migration is supported only if all of "
+               "them support P2P migration");
+    return migrate_add_blocker_normal(&multiple_devices_migration_blocker,
+                                      errp);
+}
+
+static void vfio_unblock_multiple_devices_migration(void)
+{
+    if (!multiple_devices_migration_blocker ||
+        !vfio_multiple_devices_migration_is_supported()) {
+        return;
+    }
+
+    migrate_del_blocker(&multiple_devices_migration_blocker);
+}
+
 static void vfio_migration_deinit(VFIODevice *vbasedev)
 {
     VFIOMigration *migration = vbasedev->migration;

include/hw/vfio/vfio-common.h

@@ -290,8 +290,6 @@ extern VFIODeviceList vfio_device_list;
 extern const MemoryListener vfio_memory_listener;
 extern int vfio_kvm_device_fd;
 
-int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp);
-void vfio_unblock_multiple_devices_migration(void);
 bool vfio_viommu_preset(VFIODevice *vbasedev);
 void vfio_migration_add_bytes_transferred(unsigned long val);
 bool vfio_device_state_is_running(VFIODevice *vbasedev);