From: Christoph Hellwig <hch@lst.de>
To: "Jason Gunthorpe" <jgg@nvidia.com>,
"Xu Yilun" <yilun.xu@linux.intel.com>,
"Christian König" <christian.koenig@amd.com>,
"Christoph Hellwig" <hch@lst.de>,
"Leon Romanovsky" <leonro@nvidia.com>,
kvm@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
sumit.semwal@linaro.org, pbonzini@redhat.com, seanjc@google.com,
alex.williamson@redhat.com, vivek.kasireddy@intel.com,
dan.j.williams@intel.com, aik@amd.com, yilun.xu@intel.com,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
lukas@wunner.de, yan.y.zhao@intel.com, leon@kernel.org,
baolu.lu@linux.intel.com, zhenzhong.duan@intel.com,
tao1.su@intel.com
Subject: Re: [RFC PATCH 01/12] dma-buf: Introduce dma_buf_get_pfn_unlocked() kAPI
Date: Wed, 15 Jan 2025 10:32:34 +0100 [thread overview]
Message-ID: <20250115093234.GB6805@lst.de> (raw)
In-Reply-To: <Z4d4AaLGrhRa5KLJ@phenom.ffwll.local>
On Wed, Jan 15, 2025 at 09:55:29AM +0100, Simona Vetter wrote:
> I think for 90% of exporters pfn would fit, but there's some really funny
> ones where you cannot get a cpu pfn by design. So we need to keep the
> pfn-less interfaces around. But ideally for the pfn-capable exporters we'd
> have helpers/common code that just implements all the other interfaces.
There is no way to have dma address without a PFN in Linux right now.
How would you generate them? That implies you have an IOMMU that can
generate IOVAs for something that doesn't have a physical address at
all.
Or do you mean some that don't have pages associated with them, and
thus have pfn_valid fail on them? They still have a PFN, just not
one that is valid to use in most of the Linux MM.
next prev parent reply other threads:[~2025-01-15 9:32 UTC|newest]
Thread overview: 150+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-07 14:27 [RFC PATCH 00/12] Private MMIO support for private assigned dev Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 01/12] dma-buf: Introduce dma_buf_get_pfn_unlocked() kAPI Xu Yilun
2025-01-08 8:01 ` Christian König
2025-01-08 13:23 ` Jason Gunthorpe
2025-01-08 13:44 ` Christian König
2025-01-08 14:58 ` Jason Gunthorpe
2025-01-08 15:25 ` Christian König
2025-01-08 16:22 ` Jason Gunthorpe
2025-01-08 17:56 ` Xu Yilun
2025-01-10 19:24 ` Simona Vetter
2025-01-10 20:16 ` Jason Gunthorpe
2025-01-08 18:44 ` Simona Vetter
2025-01-08 19:22 ` Xu Yilun
2025-01-09 8:04 ` Christian König
2025-01-08 23:06 ` Xu Yilun
2025-01-10 19:34 ` Simona Vetter
2025-01-10 20:38 ` Jason Gunthorpe
2025-01-12 22:10 ` Xu Yilun
2025-01-14 14:44 ` Simona Vetter
2025-01-14 17:31 ` Jason Gunthorpe
2025-01-15 8:55 ` Simona Vetter
2025-01-15 9:32 ` Christoph Hellwig [this message]
2025-01-15 13:34 ` Jason Gunthorpe
2025-01-16 5:33 ` Christoph Hellwig
2024-06-19 23:39 ` Xu Yilun
2025-01-16 13:28 ` Jason Gunthorpe
2025-01-15 10:06 ` Christian König
2025-01-17 14:42 ` Simona Vetter
2025-01-20 12:14 ` Christian König
2025-01-20 17:59 ` Jason Gunthorpe
2025-01-20 18:50 ` Simona Vetter
2025-01-20 19:48 ` Jason Gunthorpe
2025-01-21 16:11 ` Simona Vetter
2025-01-21 17:36 ` Jason Gunthorpe
2025-01-22 11:04 ` Simona Vetter
2025-01-22 13:28 ` Jason Gunthorpe
2025-01-22 13:29 ` Christian König
2025-01-22 14:37 ` Jason Gunthorpe
2025-01-22 14:59 ` Christian König
2025-01-23 13:59 ` Jason Gunthorpe
2025-01-23 14:32 ` Christian König
2025-01-23 14:35 ` Christian König
2025-01-23 15:02 ` Jason Gunthorpe
2025-01-23 15:48 ` Christian König
2025-01-23 16:08 ` Jason Gunthorpe
2025-01-09 8:09 ` Christian König
2025-01-10 20:54 ` Jason Gunthorpe
2025-01-15 9:38 ` Christian König
2025-01-15 13:38 ` Jason Gunthorpe
2025-01-15 13:45 ` Christian König
2025-01-15 13:46 ` Christian König
2025-01-15 14:14 ` Jason Gunthorpe
2025-01-15 14:29 ` Christian König
2025-01-15 14:30 ` Christian König
2025-01-15 15:10 ` Jason Gunthorpe
2025-01-15 16:34 ` Christian König
2025-01-15 17:09 ` Jason Gunthorpe
2025-01-16 15:13 ` Christian König
2024-06-20 22:02 ` Xu Yilun
2025-01-20 13:44 ` Christian König
2025-01-22 4:16 ` Xu Yilun
2025-01-16 16:07 ` Jason Gunthorpe
2025-01-17 14:37 ` Simona Vetter
2025-01-09 9:10 ` Christian König
2025-01-09 9:28 ` Leon Romanovsky
2025-01-07 14:27 ` [RFC PATCH 02/12] vfio: Export vfio device get and put registration helpers Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 03/12] vfio/pci: Share the core device pointer while invoking feature functions Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 04/12] vfio/pci: Allow MMIO regions to be exported through dma-buf Xu Yilun
2026-05-06 2:35 ` Alexey Kardashevskiy
2026-05-06 13:16 ` Jason Gunthorpe
2026-05-07 7:16 ` Alexey Kardashevskiy
2026-05-11 12:01 ` Jason Gunthorpe
2026-05-11 23:42 ` Alexey Kardashevskiy
2026-05-11 23:56 ` Jason Gunthorpe
2026-05-12 5:49 ` Alexey Kardashevskiy
2025-01-07 14:27 ` [RFC PATCH 05/12] vfio/pci: Support get_pfn() callback for dma-buf Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 06/12] KVM: Support vfio_dmabuf backed MMIO region Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 07/12] KVM: x86/mmu: Handle page fault for vfio_dmabuf backed MMIO Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 08/12] vfio/pci: Create host unaccessible dma-buf for private device Xu Yilun
2025-01-08 13:30 ` Jason Gunthorpe
2025-01-08 16:57 ` Xu Yilun
2025-01-09 14:40 ` Jason Gunthorpe
2025-01-09 16:40 ` Xu Yilun
2025-01-10 13:31 ` Jason Gunthorpe
2025-01-11 3:48 ` Xu Yilun
2025-01-13 16:49 ` Jason Gunthorpe
2024-06-17 23:28 ` Xu Yilun
2025-01-14 13:35 ` Jason Gunthorpe
2025-01-15 12:57 ` Alexey Kardashevskiy
2025-01-15 13:01 ` Jason Gunthorpe
2025-01-17 1:57 ` Baolu Lu
2025-01-17 13:25 ` Jason Gunthorpe
2024-06-23 19:59 ` Xu Yilun
2025-01-20 13:25 ` Jason Gunthorpe
2024-06-24 21:12 ` Xu Yilun
2025-01-21 17:43 ` Jason Gunthorpe
2025-01-22 4:32 ` Xu Yilun
2025-01-22 12:55 ` Jason Gunthorpe
2025-01-23 7:41 ` Xu Yilun
2025-01-23 13:08 ` Jason Gunthorpe
2025-01-20 4:41 ` Baolu Lu
2025-01-20 9:45 ` Alexey Kardashevskiy
2025-01-20 13:28 ` Jason Gunthorpe
2025-03-12 1:37 ` Dan Williams
2025-03-17 16:38 ` Jason Gunthorpe
2025-01-07 14:27 ` [RFC PATCH 09/12] vfio/pci: Export vfio dma-buf specific info for importers Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 10/12] KVM: vfio_dmabuf: Fetch VFIO specific dma-buf data for sanity check Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 11/12] KVM: x86/mmu: Export kvm_is_mmio_pfn() Xu Yilun
2025-01-07 14:27 ` [RFC PATCH 12/12] KVM: TDX: Implement TDX specific private MMIO map/unmap for SEPT Xu Yilun
2025-04-29 6:48 ` [RFC PATCH 00/12] Private MMIO support for private assigned dev Alexey Kardashevskiy
2025-04-29 7:50 ` Alexey Kardashevskiy
2025-05-09 3:04 ` Alexey Kardashevskiy
2025-05-09 11:12 ` Xu Yilun
2025-05-09 16:28 ` Xu Yilun
2025-05-09 18:43 ` Jason Gunthorpe
2025-05-10 3:47 ` Xu Yilun
2025-05-12 9:30 ` Alexey Kardashevskiy
2025-05-12 14:06 ` Jason Gunthorpe
2025-05-13 10:03 ` Zhi Wang
2025-05-14 9:47 ` Xu Yilun
2025-05-14 20:05 ` Zhi Wang
2025-05-15 18:02 ` Xu Yilun
2025-05-15 19:21 ` Jason Gunthorpe
2025-05-16 6:19 ` Xu Yilun
2025-05-16 12:49 ` Jason Gunthorpe
2025-05-17 2:33 ` Xu Yilun
2025-05-20 10:57 ` Alexey Kardashevskiy
2025-05-24 3:33 ` Xu Yilun
2025-05-15 10:29 ` Alexey Kardashevskiy
2025-05-15 16:44 ` Zhi Wang
2025-05-15 16:53 ` Zhi Wang
2025-05-21 10:41 ` Alexey Kardashevskiy
2025-05-14 7:02 ` Xu Yilun
2025-05-14 16:33 ` Jason Gunthorpe
2025-05-15 16:04 ` Xu Yilun
2025-05-15 17:56 ` Jason Gunthorpe
2025-05-16 6:03 ` Xu Yilun
2025-05-22 3:45 ` Alexey Kardashevskiy
2025-05-24 3:13 ` Xu Yilun
2025-05-26 7:18 ` Alexey Kardashevskiy
2025-05-29 14:41 ` Xu Yilun
2025-05-29 16:29 ` Jason Gunthorpe
2025-05-30 16:07 ` Xu Yilun
2025-05-30 2:29 ` Alexey Kardashevskiy
2025-05-30 16:23 ` Xu Yilun
2025-06-10 4:20 ` Alexey Kardashevskiy
2025-06-10 5:19 ` Baolu Lu
2025-06-10 6:53 ` Xu Yilun
2025-05-14 3:20 ` Xu Yilun
2025-06-10 4:37 ` Alexey Kardashevskiy
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