linux-kernel - Re: [PATCH] nvme: map uring_cmd data even if address is 0

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Message-ID: <Z7fBpnVEBhFPXUR7@kbusch-mbp>
Date: Thu, 20 Feb 2025 16:58:30 -0700
From: Keith Busch <kbusch@...nel.org>
To: Xinyu Zhang <xizhang@...estorage.com>
Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Caleb Sander Mateos <csander@...estorage.com>
Subject: Re: [PATCH] nvme: map uring_cmd data even if address is 0

On Thu, Feb 20, 2025 at 04:51:01PM -0700, Xinyu Zhang wrote:
> When using kernel registered bvec fixed buffers, the "address" is
> actually the offset into the bvec rather than userspace address.
> Therefore it can be 0.

Nice, thanks for catching this.

I'm prepping a new ublk-zc version based on previous feedback. I'll add
this into the series once its ready, and I'm hoping by tomorrow.