Re: [RFC PATCH 01/17] virtio_ring: Avoid reading unneeded used length
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2021-05-17 09:15:24
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On Mon, 2021-05-17 at 17:08 +0800, Xie Yongji wrote:
If device driver doesn't need used length, it can pass a NULL len in virtqueue_get_buf()/virtqueue_get_buf_ctx().
Well, actually, it can't right now? You should probably rephrase this, saying something like Allow passing NULL to len in ... if the device driver doesn't need the length, and don't read it in that case. or so?
Then we can avoid reading and validating the len value in used ring entries.
Not sure what that "validating" is about, I only see reading? johannes _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization