linux-kernel - Re: [PATCH v10 0/8] Userspace P2PDMA with O

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Date:   Fri, 23 Sep 2022 10:16:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v10 0/8] Userspace P2PDMA with O_DIRECT NVMe devices

On Thu, Sep 22, 2022 at 10:39:18AM -0600, Logan Gunthorpe wrote:
> Hi,
> 
> This is the latest P2PDMA userspace patch set. This version includes
> some cleanup from feedback of the last posting[1].
> 
> This patch set enables userspace P2PDMA by allowing userspace to mmap()
> allocated chunks of the CMB. The resulting VMA can be passed only
> to O_DIRECT IO on NVMe backed files or block devices. A flag is added
> to GUP() in Patch 1, then Patches 2 through 6 wire this flag up based
> on whether the block queue indicates P2PDMA support. Patches 7
> creates the sysfs resource that can hand out the VMAs and Patch 8
> adds brief documentation for the new interface.
> 
> Feedback welcome.
> 
> This series is based on v6.0-rc6. A git branch is available here:
> 
>   https://github.com/sbates130272/linux-p2pmem/  p2pdma_user_cmb_v10

Looks good to me, thanks for sticking with it.

greg k-h