[PULL 06/12] vfio/migration: Move migration v1 logic to vfio_migration_init()

[Alex Williamson <alex.williamson@redhat.com>]

From: Avihai Horon <avihaih@nvidia.com>

Move vfio_dev_get_region_info() logic from vfio_migration_probe() to
vfio_migration_init(). This logic is specific to v1 protocol and moving
it will make it easier to add the v2 protocol implementation later.
No functional changes intended.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Link: https://lore.kernel.org/r/20230216143630.25610-7-avihaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/vfio/migration.c  |   30 +++++++++++++++---------------
 hw/vfio/trace-events |    2 +-
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 8e9699966962..a3bf7327a1d6 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -786,14 +786,14 @@ static void vfio_migration_exit(VFIODevice *vbasedev)
     vbasedev->migration = NULL;
 }
 
-static int vfio_migration_init(VFIODevice *vbasedev,
-                               struct vfio_region_info *info)
+static int vfio_migration_init(VFIODevice *vbasedev)
 {
     int ret;
     Object *obj;
     VFIOMigration *migration;
     char id[256] = "";
     g_autofree char *path = NULL, *oid = NULL;
+    struct vfio_region_info *info;
 
     if (!vbasedev->ops->vfio_get_object) {
         return -EINVAL;
@@ -804,6 +804,14 @@ static int vfio_migration_init(VFIODevice *vbasedev,
         return -EINVAL;
     }
 
+    ret = vfio_get_dev_region_info(vbasedev,
+                                   VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
+                                   VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
+                                   &info);
+    if (ret) {
+        return ret;
+    }
+
     vbasedev->migration = g_new0(VFIOMigration, 1);
     vbasedev->migration->device_state = VFIO_DEVICE_STATE_V1_RUNNING;
     vbasedev->migration->vm_running = runstate_is_running();
@@ -823,6 +831,8 @@ static int vfio_migration_init(VFIODevice *vbasedev,
         goto err;
     }
 
+    g_free(info);
+
     migration = vbasedev->migration;
     migration->vbasedev = vbasedev;
 
@@ -845,6 +855,7 @@ static int vfio_migration_init(VFIODevice *vbasedev,
     return 0;
 
 err:
+    g_free(info);
     vfio_migration_exit(vbasedev);
     return ret;
 }
@@ -858,22 +869,13 @@ int64_t vfio_mig_bytes_transferred(void)
 
 int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
 {
-    struct vfio_region_info *info = NULL;
     int ret = -ENOTSUP;
 
     if (!vbasedev->enable_migration) {
         goto add_blocker;
     }
 
-    ret = vfio_get_dev_region_info(vbasedev,
-                                   VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
-                                   VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
-                                   &info);
-    if (ret) {
-        goto add_blocker;
-    }
-
-    ret = vfio_migration_init(vbasedev, info);
+    ret = vfio_migration_init(vbasedev);
     if (ret) {
         goto add_blocker;
     }
@@ -883,14 +885,12 @@ int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
         return ret;
     }
 
-    trace_vfio_migration_probe(vbasedev->name, info->index);
-    g_free(info);
+    trace_vfio_migration_probe(vbasedev->name);
     return 0;
 
 add_blocker:
     error_setg(&vbasedev->migration_blocker,
                "VFIO device doesn't support migration");
-    g_free(info);
 
     ret = migrate_add_blocker(vbasedev->migration_blocker, errp);
     if (ret < 0) {
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 90a8aecb3765..6be5381cc973 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -148,7 +148,7 @@ vfio_display_edid_update(uint32_t prefx, uint32_t prefy) "%ux%u"
 vfio_display_edid_write_error(void) ""
 
 # migration.c
-vfio_migration_probe(const char *name, uint32_t index) " (%s) Region %d"
+vfio_migration_probe(const char *name) " (%s)"
 vfio_migration_set_state(const char *name, uint32_t state) " (%s) state %d"
 vfio_vmstate_change(const char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d"
 vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"