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vdpa: do not set virtio status bits if unneeded

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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>
This commit is contained in:
Eugenio Pérez 2023-12-15 18:28:19 +01:00 • committed by Michael S. Tsirkin
parent 410cefbd5c
commit bc865bfe2d
1 changed files with 4 additions and 0 deletions
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4
hw/virtio/vhost-vdpa.c
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@ -511,6 +511,10 @@ static int vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
if (ret < 0) { if (ret < 0) {
return ret; return ret;
} }
if ((s & status) == status) {
/* Don't set bits already set */
return 0;
}
s |= status; s |= status;