linux-hardening - Re: [PATCH v6 05/11] PCI/P2PDMA: Document DMABUF model

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Message-ID: <20251103080518.GB50752@unreal>
Date: Mon, 3 Nov 2025 10:05:18 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>, Jens Axboe <axboe@...nel.dk>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Ankit Agrawal <ankita@...dia.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <skolothumtho@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Krishnakant Jaju <kjaju@...dia.com>, Matt Ochs <mochs@...dia.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, iommu@...ts.linux.dev,
	linux-mm@...ck.org, linux-doc@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, kvm@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v6 05/11] PCI/P2PDMA: Document DMABUF model

On Sun, Nov 02, 2025 at 10:16:59AM -0800, Randy Dunlap wrote:
> 
> 
> On 11/2/25 1:00 AM, Leon Romanovsky wrote:
> > From: Jason Gunthorpe <jgg@...dia.com>
> > 
> > Reflect latest changes in p2p implementation to support DMABUF lifecycle.
> > 
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> > ---
> >  Documentation/driver-api/pci/p2pdma.rst | 95 +++++++++++++++++++++++++--------
> >  1 file changed, 72 insertions(+), 23 deletions(-)

<...>

> > +guarentee that the consuming driver has stopped using the MMIO during a removal
> 
>    guarantee

<...>

> > +if are used with mmap() must create special PTEs. As such there are very few
> 
>    if used

<...>

> > +pggmap of MEMORY_DEVICE_PCI_P2PDMA to create struct pages. The lifecylce of
> 
>    pgmap ?                                                        lifecycle

<...>

> > +architectures, others will experiance corruption or just crash in the kernel.
> 
>                               experience

<...>

> > +In this case the initator and target pci_devices are known and the P2P subsystem
> 
>                     initiator

<...>

> > +exporting driver has destroyed it's p2p_provider.
>                                   its

Thanks a lot, fixed.

> 
> -- 
> ~Randy
> 
>