From: Eugenio Pérez <eperezma@redhat.com>
Date: Fri, 15 Dec 2023 17:28:19 +0000 (+0100)
Subject: vdpa: do not set virtio status bits if unneeded
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bc865bfe2d54ac56daa20a6395abff68fab6a5d6;p=qemu.git

vdpa: do not set virtio status bits if unneeded

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>
Message-Id: <20231215172830.2540987-2-eperezma@redhat.com>
---

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 819b2d811a..401dfa96fd 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -511,6 +511,10 @@ 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;