[Qemu-devel] [PATCH v6 07/13] vfio: Add migration state change notifier

[Kirti Wankhede <kwankhede@nvidia.com>]

Added migration state change notifier to get notification on migration state
change. These states are translated to VFIO device state and conveyed to vendor
driver.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Neo Jia <cjia@nvidia.com>
---
 hw/vfio/migration.c           | 54 +++++++++++++++++++++++++++++++++++++++++++
 hw/vfio/trace-events          |  1 +
 include/hw/vfio/vfio-common.h |  1 +
 3 files changed, 56 insertions(+)

diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index c01f08b659d0..e4a89a6f9bc7 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -132,6 +132,53 @@ static void vfio_vmstate_change(void *opaque, int running, RunState state)
     }
 }
 
+static void vfio_migration_state_notifier(Notifier *notifier, void *data)
+{
+    MigrationState *s = data;
+    VFIODevice *vbasedev = container_of(notifier, VFIODevice, migration_state);
+    int ret;
+
+    trace_vfio_migration_state_notifier(vbasedev->name, s->state);
+
+    switch (s->state) {
+    case MIGRATION_STATUS_ACTIVE:
+        if (vbasedev->device_state & VFIO_DEVICE_STATE_RUNNING) {
+            if (vbasedev->vm_running) {
+                ret = vfio_migration_set_state(vbasedev,
+                          VFIO_DEVICE_STATE_RUNNING | VFIO_DEVICE_STATE_SAVING);
+                if (ret) {
+                    error_report("%s: Failed to set state RUNNING and SAVING",
+                                  vbasedev->name);
+                }
+            } else {
+                ret = vfio_migration_set_state(vbasedev,
+                                               VFIO_DEVICE_STATE_SAVING);
+                if (ret) {
+                    error_report("%s: Failed to set state STOP and SAVING",
+                                 vbasedev->name);
+                }
+            }
+        } else {
+            ret = vfio_migration_set_state(vbasedev,
+                                           VFIO_DEVICE_STATE_RESUMING);
+            if (ret) {
+                error_report("%s: Failed to set state RESUMING",
+                             vbasedev->name);
+            }
+        }
+        return;
+
+    case MIGRATION_STATUS_CANCELLING:
+    case MIGRATION_STATUS_CANCELLED:
+    case MIGRATION_STATUS_FAILED:
+        ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING);
+        if (ret) {
+            error_report("%s: Failed to set state RUNNING", vbasedev->name);
+        }
+        return;
+    }
+}
+
 static int vfio_migration_init(VFIODevice *vbasedev,
                                struct vfio_region_info *info)
 {
@@ -152,6 +199,9 @@ static int vfio_migration_init(VFIODevice *vbasedev,
     vbasedev->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
                                                           vbasedev);
 
+    vbasedev->migration_state.notify = vfio_migration_state_notifier;
+    add_migration_state_change_notifier(&vbasedev->migration_state);
+
     return 0;
 }
 
@@ -194,6 +244,10 @@ void vfio_migration_finalize(VFIODevice *vbasedev)
         return;
     }
 
+    if (vbasedev->migration_state.notify) {
+        remove_migration_state_change_notifier(&vbasedev->migration_state);
+    }
+
     if (vbasedev->vm_state) {
         qemu_del_vm_change_state_handler(vbasedev->vm_state);
     }
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 3d15bacd031a..69503228f20e 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -148,3 +148,4 @@ vfio_display_edid_write_error(void) ""
 vfio_migration_probe(char *name, uint32_t index) " (%s) Region %d"
 vfio_migration_set_state(char *name, uint32_t state) " (%s) state %d"
 vfio_vmstate_change(char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d"
+vfio_migration_state_notifier(char *name, int state) " (%s) state %d"
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index f6c70db3a9c1..a022484d2636 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -128,6 +128,7 @@ typedef struct VFIODevice {
     uint32_t device_state;
     VMChangeStateEntry *vm_state;
     int vm_running;
+    Notifier migration_state;
 } VFIODevice;
 
 struct VFIODeviceOps {
-- 
2.7.0