From: Jason Gunthorpe <jgg@nvidia.com>
To: Alexey Kardashevskiy <aik@amd.com>
Cc: Xu Yilun <yilun.xu@linux.intel.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, christian.koenig@amd.com,
pbonzini@redhat.com, seanjc@google.com,
alex.williamson@redhat.com, vivek.kasireddy@intel.com,
dan.j.williams@intel.com, yilun.xu@intel.com,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
lukas@wunner.de, yan.y.zhao@intel.com, daniel.vetter@ffwll.ch,
leon@kernel.org, baolu.lu@linux.intel.com,
zhenzhong.duan@intel.com, tao1.su@intel.com
Subject: Re: [RFC PATCH 04/12] vfio/pci: Allow MMIO regions to be exported through dma-buf
Date: Mon, 11 May 2026 09:01:38 -0300 [thread overview]
Message-ID: <20260511120138.GB1116784@nvidia.com> (raw)
In-Reply-To: <3128deea-95a3-4c36-902b-37f280913f2b@amd.com>
On Thu, May 07, 2026 at 05:16:56PM +1000, Alexey Kardashevskiy wrote:
> true but either way dmabuf slicing will be directed by QEMU's
> msix-table emulation MR and this slicing needs to match the TDISP
> report so I'll have to teach QEMU these reports, right? I am worried
> if I miss something obvious, again. Thanks,
I don't think so.. It just needs to slice it into the MSI page
blindly. When the VM goes to validate the TDISP report against the
mappings it will fail to accept the device if there is a mismatch.
The only thing qemu could do is fail sooner, but I don't know that is
worth the complexity as we do expect all devices to have their MSI
range unprotected.
Jason
next prev parent reply other threads:[~2026-05-11 12:01 UTC|newest]
Thread overview: 141+ 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
[not found] ` <58e97916-e6fd-41ef-84b4-bbf53ed0e8e4@amd.com>
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
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
[not found] ` <420bd2ea-d87c-4f01-883e-a7a5cf1635fe@amd.com>
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
[not found] ` <9a36fba5-2dee-46fd-9f51-47c5f0ffc1d4@amd.com>
2025-01-23 14:35 ` Christian König
2025-01-23 15:02 ` Jason Gunthorpe
[not found] ` <89f46c7f-a585-44e2-963d-bf00bf09b493@amd.com>
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
[not found] ` <f6c2524f-5ef5-4c2c-a464-a7b195e0bf6c@amd.com>
2025-01-15 13:46 ` Christian König
2025-01-15 14:14 ` Jason Gunthorpe
[not found] ` <c86cfee1-063a-4972-a343-ea0eff2141c9@amd.com>
2025-01-15 14:30 ` Christian König
2025-01-15 15:10 ` Jason Gunthorpe
[not found] ` <6f7a14aa-f607-45f9-9e15-759e26079dec@amd.com>
2025-01-15 17:09 ` Jason Gunthorpe
[not found] ` <5f588dac-d3e2-445d-9389-067b875412dc@amd.com>
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
[not found] ` <0e7f92bd-7da3-4328-9081-0957b3d155ca@amd.com>
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 [this message]
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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