Re: [PATCH v9 6/8] block: set FOLL_PCI_P2PDMA in bio_map_user_iov()

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To: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Subject: Re: [PATCH v9 6/8] block: set FOLL_PCI_P2PDMA in bio_map_user_iov()
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 5 Sep 2022 16:36:53 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Christoph Hellwig <hch@xxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Christian König <christian.koenig@xxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, Don Dutile <ddutile@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Minturn Dave B <dave.b.minturn@xxxxxxxxx>, Jason Ekstrand <jason@xxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Xiong Jianxin <jianxin.xiong@xxxxxxxxx>, Bjorn Helgaas <helgaas@xxxxxxxxxx>, Ira Weiny <ira.weiny@xxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Martin Oliveira <martin.oliveira@xxxxxxxxxxxxx>, Chaitanya Kulkarni <ckulkarnilinux@xxxxxxxxx>, Ralph Campbell <rcampbell@xxxxxxxxxx>, Stephen Bates <sbates@xxxxxxxxxxxx>
In-reply-to: <20220825152425.6296-7-logang@deltatee.com>
References: <20220825152425.6296-1-logang@deltatee.com> <20220825152425.6296-7-logang@deltatee.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Thu, Aug 25, 2022 at 09:24:23AM -0600, Logan Gunthorpe wrote:
> When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for
> iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be
> passed from userspace and enables the NVMe passthru requests to
> use P2PDMA pages.
> 
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>

Looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>

References:
- [PATCH v9 0/8] Userspace P2PDMA with O_DIRECT NVMe devices
  - From: Logan Gunthorpe
- [PATCH v9 6/8] block: set FOLL_PCI_P2PDMA in bio_map_user_iov()
  - From: Logan Gunthorpe

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