Commit ac9dcca2 authored by Dongli Zhang's avatar Dongli Zhang Committed by Michael S. Tsirkin
Browse files

vhost-scsi: log event queue write descriptors



Log write descriptors for the event queue, leveraging vhost_get_vq_desc()
to retrieve the array of write descriptors to obtain the log buffer.

There is only one path for event queue.

Suggested-by: default avatarJoao Martins <joao.m.martins@oracle.com>
Signed-off-by: default avatarDongli Zhang <dongli.zhang@oracle.com>
Reviewed-by: default avatarMike Christie <michael.christie@oracle.com>
Message-Id: <20250403063028.16045-9-dongli.zhang@oracle.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent a94c96a3
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+15 −1
Original line number Diff line number Diff line
@@ -571,6 +571,8 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT].vq;
	struct virtio_scsi_event *event = &evt->event;
	struct virtio_scsi_event __user *eventp;
	struct vhost_log *vq_log;
	unsigned int log_num;
	unsigned out, in;
	int head, ret;

@@ -581,9 +583,19 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)

again:
	vhost_disable_notify(&vs->dev, vq);

	vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ?
		vq->log : NULL;

	/*
	 * Reset 'log_num' since vhost_get_vq_desc() may reset it only
	 * after certain condition checks.
	 */
	log_num = 0;

	head = vhost_get_vq_desc(vq, vq->iov,
			ARRAY_SIZE(vq->iov), &out, &in,
			NULL, NULL);
			vq_log, &log_num);
	if (head < 0) {
		vs->vs_events_missed = true;
		return;
@@ -613,6 +625,8 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt)
		vhost_add_used_and_signal(&vs->dev, vq, head, 0);
	else
		vq_err(vq, "Faulted on vhost_scsi_send_event\n");

	vhost_scsi_log_write(vq, vq_log, log_num);
}

static void vhost_scsi_complete_events(struct vhost_scsi *vs, bool drop)