The device already has a virtio status set by vhost_vdpa_init by the
time vhost_vdpa_probe_cvq_isolation is called. vhost_vdpa_init set
S_ACKNOWLEDGE and S_DRIVER, so it is invalid to just reset it.
It is invalid to start the device after it, but all devices seems to be
fine with it. Fixing qemu so it follows virtio start procedure.
Fixes: 152128d64697 ("vdpa: move CVQ isolation check to net_init_vhost_vdpa")
Reported-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
net/vhost-vdpa.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 9795306742..d7e2b714b4 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -1333,6 +1333,8 @@ static int vhost_vdpa_probe_cvq_isolation(int device_fd,
uint64_t features,
out:
status = 0;
ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
+ status = VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER;
+ ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);