Re: [PATCH v5 24/36] vfio/migration: Multifd device state transfer - add support checking function

[Cédric Le Goater]

On 2/19/25 21:34, Maciej S. Szmigiero wrote:

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>

Reviewed-by: Cédric Le Goater <c...@redhat.com>

Thanks,

C.

---
  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 760b110a39b9..7328ad8e925c 100644
--- a/hw/vfio/migration-multifd.c
+++ b/hw/vfio/migration-multifd.c
@@ -83,3 +83,9 @@ static VFIOStateBuffer 
*vfio_state_buffers_at(VFIOStateBuffers *bufs, guint idx)
  {
      return &g_array_index(bufs->array, VFIOStateBuffer, idx);
  }
+
+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 64d117b27210..8fe004c1da81 100644
--- a/hw/vfio/migration-multifd.h
+++ b/hw/vfio/migration-multifd.h
@@ -12,4 +12,6 @@

#include "hw/vfio/vfio-common.h" +bool vfio_multifd_transfer_supported(void);

+
  #endif