[PATCH 2/2] vdpa: Block vq property changes in DRIVER_OK

[Dragos Tatulea]

The virtio standard doesn't allow for virtqueue address and state
changes when the device is in DRIVER_OK. Return an error in such cases
unless the device is suspended.

The suspended device exception is needed because some devices support
virtqueue changes when the device is suspended.

Signed-off-by: Dragos Tatulea <dtatu...@nvidia.com>
Suggested-by: Eugenio Pérez <epere...@redhat.com>
---
 drivers/vhost/vdpa.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 4c422be7d1e7..620073383d15 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -703,6 +703,9 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, 
unsigned int cmd,
 
        switch (cmd) {
        case VHOST_SET_VRING_ADDR:
+               if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && 
!v->suspended)
+                       return -EINVAL;
+
                if (ops->set_vq_address(vdpa, idx,
                                        (u64)(uintptr_t)vq->desc,
                                        (u64)(uintptr_t)vq->avail,
@@ -711,6 +714,9 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, 
unsigned int cmd,
                break;
 
        case VHOST_SET_VRING_BASE:
+               if ((ops->get_status(vdpa) & VIRTIO_CONFIG_S_DRIVER_OK) && 
!v->suspended)
+                       return -EINVAL;
+
                if (vhost_has_feature(vq, VIRTIO_F_RING_PACKED)) {
                        vq_state.packed.last_avail_idx = vq->last_avail_idx & 
0x7fff;
                        vq_state.packed.last_avail_counter = 
!!(vq->last_avail_idx & 0x8000);
-- 
2.43.0