lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 19 Apr 2017 12:19:32 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Jerome Glisse <jglisse@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Keith Busch <keith.busch@...el.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-rdma@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Steve Wise <swise@...ngridcomputing.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-nvme@...ts.infradead.org,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        linux-nvdimm <linux-nvdimm@...1.01.org>,
        Max Gurtovoy <maxg@...lanox.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC 0/8] Copy Offload with Peer-to-Peer PCI Memory



On 19/04/17 12:11 PM, Logan Gunthorpe wrote:
> 
> 
> On 19/04/17 11:41 AM, Dan Williams wrote:
>> No, not quite ;-). I still don't think we should require the non-HMM
>> to pass NULL for all the HMM arguments. What I like about Logan's
>> proposal is to have a separate create and register steps dev_pagemap.
>> That way call paths that don't care about HMM specifics can just turn
>> around and register the vanilla dev_pagemap.
> 
> Would you necessarily even need a create step? I was thinking more along
> the lines that struct dev_pagemap _could_ just be a member in another
> structure. The caller would set the attributes they needed and pass it
> to devm_memremap. (Similar to how we commonly do things with struct
> device, et al). Potentially, that could also get rid of the need for the
> *data pointer HMM is using to get back the struct hmm_devmem seeing
> container_of could be used instead.

Also, now that I've thought about it a little more, it _may_ be that
many or all of the hmm specific fields in dev_pagemap could move to a
containing struct too...

Logan

Powered by blists - more mailing lists