From: "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>

Add vfio_multifd_transfer_supported() function that tells whether the
multifd device state transfer is supported.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
---
 hw/vfio/migration-multifd.c | 6 ++++++
 hw/vfio/migration-multifd.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/hw/vfio/migration-multifd.c b/hw/vfio/migration-multifd.c
index fa594b33fdd1..79fae0b6296f 100644
--- a/hw/vfio/migration-multifd.c
+++ b/hw/vfio/migration-multifd.c
@@ -31,3 +31,9 @@ typedef struct VFIODeviceStatePacket {
     uint32_t flags;
     uint8_t data[0];
 } QEMU_PACKED VFIODeviceStatePacket;
+
+bool vfio_multifd_transfer_supported(void)
+{
+    return multifd_device_state_supported() &&
+        migrate_send_switchover_start();
+}
diff --git a/hw/vfio/migration-multifd.h b/hw/vfio/migration-multifd.h
index 5b221c6e16b0..1b60d5f67a1c 100644
--- a/hw/vfio/migration-multifd.h
+++ b/hw/vfio/migration-multifd.h
@@ -14,4 +14,6 @@
 
 #include "hw/vfio/vfio-common.h"
 
+bool vfio_multifd_transfer_supported(void);
+
 #endif