[PATCH v4 25/33] vfio/migration: Multifd device state transfer - add support checking function

[Maciej S. Szmigiero]

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

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

Signed-off-by: Maciej S. Szmigiero <maciej.szmigi...@oracle.com>
---
 hw/vfio/migration.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 40cbe1be687d..3211041939c6 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -519,6 +519,12 @@ static bool vfio_precopy_supported(VFIODevice *vbasedev)
     return migration->mig_flags & VFIO_MIGRATION_PRE_COPY;
 }
 
+static bool vfio_multifd_transfer_supported(void)
+{
+    return multifd_device_state_supported() &&
+        migrate_send_switchover_start();
+}
+
 /* ---------------------------------------------------------------------- */
 
 static int vfio_save_prepare(void *opaque, Error **errp)