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vhost-scsi: log event queue write descriptors

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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: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20250403063028.16045-9-dongli.zhang@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dongli Zhang 2025-04-02 23:29:53 -07:00 committed by Michael S. Tsirkin
parent a94c96a352
commit ac9dcca236
1 changed files with 15 additions and 1 deletions
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16
drivers/vhost/scsi.c
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@ -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 @@ again:
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)