diff options
| author |   Stefano Garzarella <sgarzare@redhat.com> | 2022-06-30 17:32:21 +0200 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2022-08-11 04:26:07 -0400 |
| commit | 8472019eec2ccff60144d8585367b2856a59416e (patch) | |
| tree | ff2df3639ffdc65144bac9daa76ca71345dd651a /drivers/vdpa | |
| parent | vdpa_sim_blk: limit the number of request handled per batch (diff) | |
| download | wireguard-linux-8472019eec2ccff60144d8585367b2856a59416e.tar.xz wireguard-linux-8472019eec2ccff60144d8585367b2856a59416e.zip | |
vdpa_sim_blk: call vringh_complete_iotlb() also in the error path
Call vringh_complete_iotlb() even when we encounter a serious error
that prevents us from writing the status in the "in" header
(e.g. the header length is incorrect, etc.).
The guest is misbehaving, so maybe the ring is in a bad state, but
let's avoid making things worse.
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220630153221.83371-4-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vdpa')
| -rw-r--r-- | drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c index b2d75efec63a..43422b3854d2 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c @@ -63,6 +63,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim, { size_t pushed = 0, to_pull, to_push; struct virtio_blk_outhdr hdr; + bool handled = false; ssize_t bytes; loff_t offset; u64 sector; @@ -78,12 +79,12 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim, if (vq->out_iov.used < 1 || vq->in_iov.used < 1) { dev_dbg(&vdpasim->vdpa.dev, "missing headers - out_iov: %u in_iov %u\n", vq->out_iov.used, vq->in_iov.used); - return false; + goto err; } if (vq->in_iov.iov[vq->in_iov.used - 1].iov_len < 1) { dev_dbg(&vdpasim->vdpa.dev, "request in header too short\n"); - return false; + goto err; } /* The last byte is the status and we checked if the last iov has @@ -97,7 +98,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim, sizeof(hdr)); if (bytes != sizeof(hdr)) { dev_dbg(&vdpasim->vdpa.dev, "request out header too short\n"); - return false; + goto err; } to_pull -= bytes; @@ -182,16 +183,19 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim, /* Last byte is the status */ bytes = vringh_iov_push_iotlb(&vq->vring, &vq->in_iov, &status, 1); if (bytes != 1) - return false; + goto err; pushed += bytes; /* Make sure data is wrote before advancing index */ smp_wmb(); + handled = true; + +err: vringh_complete_iotlb(&vq->vring, vq->head, pushed); - return true; + return handled; } static void vdpasim_blk_work(struct work_struct *work) |