From: Christoph Hellwig <hch@infradead.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: "Christoph Hellwig" <hch@infradead.org>,
"Leon Romanovsky" <leon@kernel.org>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Leon Romanovsky" <leonro@nvidia.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Christian König" <christian.koenig@amd.com>,
dri-devel@lists.freedesktop.org, iommu@lists.linux.dev,
"Jens Axboe" <axboe@kernel.dk>, "Joerg Roedel" <joro@8bytes.org>,
kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-media@vger.kernel.org, linux-mm@kvack.org,
linux-pci@vger.kernel.org,
"Logan Gunthorpe" <logang@deltatee.com>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Vivek Kasireddy" <vivek.kasireddy@intel.com>,
"Will Deacon" <will@kernel.org>
Subject: Re: [PATCH v5 8/9] vfio/pci: Enable peer-to-peer DMA transactions by default
Date: Wed, 22 Oct 2025 00:08:48 -0700 [thread overview]
Message-ID: <aPiDACJHZY7Gu4y1@infradead.org> (raw)
In-Reply-To: <20251020130855.GM316284@nvidia.com>
On Mon, Oct 20, 2025 at 10:08:55AM -0300, Jason Gunthorpe wrote:
> Sure, but this should be handled by the P2P subsystem and PCI quirks,
> IMHO. It isn't VFIOs job.. If people complain about broken HW then it
> is easy to add those things.
I think it is. You now open up behavior generally that previously
had specific drivers in charge.
> IDK where Intel GPU lands on this, but VFIO has always supported P2P
How?
next prev parent reply other threads:[~2025-10-22 7:08 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-13 15:26 [PATCH v5 0/9] vfio/pci: Allow MMIO regions to be exported through dma-buf Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 1/9] PCI/P2PDMA: Separate the mmap() support from the core logic Leon Romanovsky
2025-10-17 6:30 ` Christoph Hellwig
2025-10-17 11:53 ` Jason Gunthorpe
2025-10-20 12:27 ` Christoph Hellwig
2025-10-20 12:58 ` Jason Gunthorpe
2025-10-20 15:04 ` Leon Romanovsky
2025-10-22 7:10 ` Christoph Hellwig
2025-10-22 11:43 ` Jason Gunthorpe
2025-10-13 15:26 ` [PATCH v5 2/9] PCI/P2PDMA: Simplify bus address mapping API Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 3/9] PCI/P2PDMA: Refactor to separate core P2P functionality from memory allocation Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 4/9] PCI/P2PDMA: Export pci_p2pdma_map_type() function Leon Romanovsky
2025-10-17 6:31 ` Christoph Hellwig
2025-10-17 12:14 ` Jason Gunthorpe
2025-10-20 12:29 ` Christoph Hellwig
2025-10-20 13:14 ` Jason Gunthorpe
2025-10-13 15:26 ` [PATCH v5 5/9] types: move phys_vec definition to common header Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 6/9] vfio: Export vfio device get and put registration helpers Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 7/9] vfio/pci: Share the core device pointer while invoking feature functions Leon Romanovsky
2025-10-13 15:26 ` [PATCH v5 8/9] vfio/pci: Enable peer-to-peer DMA transactions by default Leon Romanovsky
2025-10-16 4:09 ` Nicolin Chen
2025-10-16 6:10 ` Leon Romanovsky
2025-10-17 6:32 ` Christoph Hellwig
2025-10-17 11:55 ` Jason Gunthorpe
2025-10-20 12:28 ` Christoph Hellwig
2025-10-20 13:08 ` Jason Gunthorpe
2025-10-22 7:08 ` Christoph Hellwig [this message]
2025-10-22 11:38 ` Jason Gunthorpe
2025-10-22 11:54 ` Jason Gunthorpe
2025-10-13 15:26 ` [PATCH v5 9/9] vfio/pci: Add dma-buf export support for MMIO regions Leon Romanovsky
2025-10-16 23:53 ` Jason Gunthorpe
2025-10-17 5:40 ` Leon Romanovsky
2025-10-17 15:58 ` Jason Gunthorpe
2025-10-17 16:01 ` Jason Gunthorpe
2025-10-17 0:01 ` Jason Gunthorpe
2025-10-17 6:33 ` Christoph Hellwig
2025-10-17 12:16 ` Jason Gunthorpe
2025-10-17 13:02 ` Jason Gunthorpe
2025-10-17 16:13 ` Leon Romanovsky
2025-10-20 16:15 ` Jason Gunthorpe
2025-10-20 16:44 ` Leon Romanovsky
2025-10-20 16:51 ` Jason Gunthorpe
2025-10-17 23:40 ` Jason Gunthorpe
2025-10-22 12:50 ` Jason Gunthorpe
2025-10-26 7:55 ` Shuai Xue
2025-10-27 12:09 ` Jason Gunthorpe
2025-10-28 13:46 ` Shuai Xue
2025-10-27 23:13 ` David Matlack
2025-10-28 12:02 ` Leon Romanovsky
2025-10-30 22:28 ` Alex Mastro
2025-10-29 16:50 ` Alex Mastro
2025-10-29 18:21 ` Leon Romanovsky
2025-10-30 0:25 ` Samiullah Khawaja
2025-10-30 6:48 ` Leon Romanovsky
2025-10-30 12:57 ` Jason Gunthorpe
2025-10-30 20:38 ` Alex Williamson
2025-10-31 6:48 ` Leon Romanovsky
2025-10-15 21:15 ` [PATCH v5 0/9] vfio/pci: Allow MMIO regions to be exported through dma-buf shinichiro.kawasaki
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