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[RFC,14/18] vdpa: do not set virtio status bits if unneeded

Message ID 20231019143455.2377694-15-eperezma@redhat.com
State New
Headers show
Series Map memory at destination .load_setup in vDPA-net migration | expand

Commit Message

Eugenio Pérez Oct. 19, 2023, 2:34 p.m. UTC 
Next commits will set DRIVER and ACKNOWLEDGE flags repeatedly in the
case of a migration destination.  Let's save ioctls with this.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-vdpa.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 7500c2fc82..cc252fc2d8 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -510,6 +510,10 @@  static int vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
     if (ret < 0) {
         return ret;
     }
+    if ((s & status) == status) {
+        /* Don't set bits already set */
+        return 0;
+    }
 
     s |= status;