@@ -1,4 +1,4 @@
-obj-y += common.o spapr.o
+obj-y += common.o spapr.o migration.o
obj-$(CONFIG_VFIO_PCI) += pci.o pci-quirks.o display.o
obj-$(CONFIG_VFIO_CCW) += ccw.o
obj-$(CONFIG_VFIO_PLATFORM) += platform.o
new file mode 100644
@@ -0,0 +1,138 @@
+/*
+ * Migration support for VFIO devices
+ *
+ * Copyright NVIDIA, Inc. 2020
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include <linux/vfio.h>
+
+#include "hw/vfio/vfio-common.h"
+#include "cpu.h"
+#include "migration/migration.h"
+#include "migration/qemu-file.h"
+#include "migration/register.h"
+#include "migration/blocker.h"
+#include "migration/misc.h"
+#include "qapi/error.h"
+#include "exec/ramlist.h"
+#include "exec/ram_addr.h"
+#include "pci.h"
+#include "trace.h"
+
+static void vfio_migration_region_exit(VFIODevice *vbasedev)
+{
+ VFIOMigration *migration = vbasedev->migration;
+
+ if (!migration) {
+ return;
+ }
+
+ if (migration->region.size) {
+ vfio_region_exit(&migration->region);
+ vfio_region_finalize(&migration->region);
+ }
+}
+
+static int vfio_migration_region_init(VFIODevice *vbasedev, int index)
+{
+ VFIOMigration *migration = vbasedev->migration;
+ Object *obj = NULL;
+ int ret = -EINVAL;
+
+ if (!vbasedev->ops->vfio_get_object) {
+ return ret;
+ }
+
+ obj = vbasedev->ops->vfio_get_object(vbasedev);
+ if (!obj) {
+ return ret;
+ }
+
+ ret = vfio_region_setup(obj, vbasedev, &migration->region, index,
+ "migration");
+ if (ret) {
+ error_report("%s: Failed to setup VFIO migration region %d: %s",
+ vbasedev->name, index, strerror(-ret));
+ goto err;
+ }
+
+ if (!migration->region.size) {
+ ret = -EINVAL;
+ error_report("%s: Invalid region size of VFIO migration region %d: %s",
+ vbasedev->name, index, strerror(-ret));
+ goto err;
+ }
+
+ return 0;
+
+err:
+ vfio_migration_region_exit(vbasedev);
+ return ret;
+}
+
+static int vfio_migration_init(VFIODevice *vbasedev,
+ struct vfio_region_info *info)
+{
+ int ret;
+
+ vbasedev->migration = g_new0(VFIOMigration, 1);
+
+ ret = vfio_migration_region_init(vbasedev, info->index);
+ if (ret) {
+ error_report("%s: Failed to initialise migration region",
+ vbasedev->name);
+ g_free(vbasedev->migration);
+ vbasedev->migration = NULL;
+ return ret;
+ }
+
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
+{
+ struct vfio_region_info *info;
+ Error *local_err = NULL;
+ int ret;
+
+ ret = vfio_get_dev_region_info(vbasedev, VFIO_REGION_TYPE_MIGRATION,
+ VFIO_REGION_SUBTYPE_MIGRATION, &info);
+ if (ret) {
+ goto add_blocker;
+ }
+
+ ret = vfio_migration_init(vbasedev, info);
+ if (ret) {
+ goto add_blocker;
+ }
+
+ trace_vfio_migration_probe(vbasedev->name, info->index);
+ return 0;
+
+add_blocker:
+ error_setg(&vbasedev->migration_blocker,
+ "VFIO device doesn't support migration");
+ ret = migrate_add_blocker(vbasedev->migration_blocker, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ error_free(vbasedev->migration_blocker);
+ }
+ return ret;
+}
+
+void vfio_migration_finalize(VFIODevice *vbasedev)
+{
+ if (vbasedev->migration_blocker) {
+ migrate_del_blocker(vbasedev->migration_blocker);
+ error_free(vbasedev->migration_blocker);
+ }
+
+ vfio_migration_region_exit(vbasedev);
+ g_free(vbasedev->migration);
+}
@@ -143,3 +143,6 @@ vfio_display_edid_link_up(void) ""
vfio_display_edid_link_down(void) ""
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"
@@ -57,6 +57,10 @@ typedef struct VFIORegion {
uint8_t nr; /* cache the region number for debug */
} VFIORegion;
+typedef struct VFIOMigration {
+ VFIORegion region;
+} VFIOMigration;
+
typedef struct VFIOAddressSpace {
AddressSpace *as;
QLIST_HEAD(, VFIOContainer) containers;
@@ -113,6 +117,8 @@ typedef struct VFIODevice {
unsigned int num_irqs;
unsigned int num_regions;
unsigned int flags;
+ VFIOMigration *migration;
+ Error *migration_blocker;
} VFIODevice;
struct VFIODeviceOps {
@@ -204,4 +210,7 @@ int vfio_spapr_create_window(VFIOContainer *container,
int vfio_spapr_remove_window(VFIOContainer *container,
hwaddr offset_within_address_space);
+int vfio_migration_probe(VFIODevice *vbasedev, Error **errp);
+void vfio_migration_finalize(VFIODevice *vbasedev);
+
#endif /* HW_VFIO_VFIO_COMMON_H */