Re: [PATCH v2 06/10] vhost-scsi: cache log buffer in I/O queue vhost_scsi_cmd

From: Dongli Zhang
Date: Thu Mar 27 2025 - 16:28:14 EST


Hi Mike,

On 3/26/25 4:37 PM, Mike Christie wrote:
> On 3/17/25 7:04 PM, Dongli Zhang wrote:
>> @@ -1390,6 +1424,24 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
>> goto err;
>> }
>>
>> + if (unlikely(vq_log && log_num)) {
>> + if (!cmd->tvc_log)
>> + cmd->tvc_log = kmalloc_array(vq->dev->iov_limit,
>> + sizeof(*cmd->tvc_log),
>> + GFP_KERNEL);
>> +
>> + if (likely(cmd->tvc_log)) {
>> + memcpy(cmd->tvc_log, vq->log,> + sizeof(*cmd->tvc_log) * log_num);
>> + cmd->tvc_log_num = log_num;
>
>
> Hey Dongli, this approach seems ok.
>
> Could you just move this to a function?

Sure. I may re-send v3 following this approach (allocate on-demand in runtime),
and encapsulate above code into a function.

Thank you very much!

Dongli Zhang