vfio/migration: Multifd device state transfer - add support checking function

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>
Link: https://lore.kernel.org/qemu-devel/8ce50256f341b3d47342bb217cb5fbb2deb14639.1741124640.git.maciej.szmigiero@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/vfio/migration-multifd.c b/hw/vfio/migration-multifd.c
index fa594b33fdd1112e1d3ecf52a35fecb551e29999..79fae0b6296f9244317ed5215e4950703c45a717 100644 (file)
--- 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 5b221c6e16b0265314034a6060b588e984b8ac5e..1b60d5f67a1c76cdac21d71a7fb7335f4e194ffe 100644 (file)
--- 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