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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 9 Dec 2020 17:22:09 -0800 From: Dan Williams <dan.j.williams@...el.com> To: Logan Gunthorpe <logang@...tatee.com> Cc: Christoph Hellwig <hch@....de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org, Linux PCI <linux-pci@...r.kernel.org>, Linux MM <linux-mm@...ck.org>, "open list:DMA MAPPING HELPERS" <iommu@...ts.linux-foundation.org>, Stephen Bates <sbates@...thlin.com>, Jason Gunthorpe <jgg@...pe.ca>, Christian König <christian.koenig@....com>, Ira Weiny <iweiny@...el.com>, John Hubbard <jhubbard@...dia.com>, Don Dutile <ddutile@...hat.com>, Matthew Wilcox <willy@...radead.org>, Daniel Vetter <daniel.vetter@...ll.ch> Subject: Re: [RFC PATCH 04/15] lib/scatterlist: Add flag for indicating P2PDMA segments in an SGL On Mon, Nov 9, 2020 at 8:47 AM Logan Gunthorpe <logang@...tatee.com> wrote: > > > > On 2020-11-09 2:12 a.m., Christoph Hellwig wrote: > > On Fri, Nov 06, 2020 at 10:00:25AM -0700, Logan Gunthorpe wrote: > >> We make use of the top bit of the dma_length to indicate a P2PDMA > >> segment. > > > > I don't think "we" can. There is nothing limiting the size of a SGL > > segment. > > Yes, I expected this would be the unacceptable part. Any alternative ideas? Why is the SG_P2PDMA_FLAG needed as compared to checking the SGL segment-pages for is_pci_p2pdma_page()?
Powered by blists - more mailing lists