From: Jason Gunthorpe <jgg@nvidia.com>
To: Ackerley Tng <ackerleytng@google.com>
Cc: Xu Yilun <yilun.xu@linux.intel.com>,
kvm@vger.kernel.org, sumit.semwal@linaro.org,
christian.koenig@amd.com, pbonzini@redhat.com, seanjc@google.com,
alex.williamson@redhat.com, dan.j.williams@intel.com,
aik@amd.com, linux-coco@lists.linux.dev,
dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org,
linaro-mm-sig@lists.linaro.org, vivek.kasireddy@intel.com,
yilun.xu@intel.com, 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,
linux-pci@vger.kernel.org, zhiw@nvidia.com,
simona.vetter@ffwll.ch, shameerali.kolothum.thodi@huawei.com,
aneesh.kumar@kernel.org, iommu@lists.linux.dev,
kevin.tian@intel.com
Subject: Re: [RFC PATCH 10/30] vfio/pci: Export vfio dma-buf specific info for importers
Date: Sun, 12 Jul 2026 19:19:34 -0300 [thread overview]
Message-ID: <20260712221934.GF674038@nvidia.com> (raw)
In-Reply-To: <CAEvNRgFpJWQ5M5sQhGpQUV3GbBq9N+MQhhaxdxa=D8ky94SCsw@mail.gmail.com>
On Sat, Jul 11, 2026 at 06:01:31PM -0700, Ackerley Tng wrote:
> In the course of a CoCo guest's operation, will the guest need to
> convert between private/shared MMIO? Will the guest need some pages
> shared and others private? If these are required operations, guest_memfd
> already provides the tracking and is going to have a conversion ioctl
> very soon. Instead of further extending dmabuf to track more things, how
> about letting guest_memfd track it?
Use another FD type was sort of my fallback if we couldn't get DMABUF
into something workable. I'm kind of surprised to see guestmemfd
proposed as the other FD, but I don't know much about its insides.
If VFIO can create one and fill it with MMIO physical addresses then
maybe it is OK?
Jason
next prev parent reply other threads:[~2026-07-12 22:19 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-29 5:34 [RFC PATCH 00/30] Host side (KVM/VFIO/IOMMUFD) support for TDISP using TSM Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 01/30] HACK: dma-buf: Introduce dma_buf_get_pfn_unlocked() kAPI Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 02/30] vfio: Export vfio device get and put registration helpers Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 03/30] vfio/pci: Share the core device pointer while invoking feature functions Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 04/30] vfio/pci: Allow MMIO regions to be exported through dma-buf Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 05/30] fixup! vfio/pci: fix dma-buf revoke typo on reset Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 06/30] HACK: vfio/pci: Support get_pfn() callback for dma-buf Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 07/30] KVM: Support vfio_dmabuf backed MMIO region Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 08/30] KVM: x86/mmu: Handle page fault for vfio_dmabuf backed MMIO Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 09/30] KVM: x86/mmu: Handle page fault for private MMIO Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 10/30] vfio/pci: Export vfio dma-buf specific info for importers Xu Yilun
2025-06-02 13:30 ` Jason Gunthorpe
2025-06-03 5:01 ` Xu Yilun
2026-07-12 1:01 ` Ackerley Tng
2026-07-12 22:19 ` Jason Gunthorpe [this message]
2026-07-13 23:16 ` Ackerley Tng
2026-07-13 19:08 ` Fuad Tabba
2026-07-13 19:17 ` Jason Gunthorpe
2026-07-13 22:40 ` Ackerley Tng
2025-05-29 5:34 ` [RFC PATCH 11/30] KVM: vfio_dmabuf: Fetch VFIO specific dma-buf data for sanity check Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 12/30] iommufd/device: Associate a kvm pointer to iommufd_device Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 13/30] fixup! iommufd/selftest: Sync iommufd_device_bind() change to selftest Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 14/30] iommu/arm-smmu-v3-iommufd: Pass in kvm pointer to viommu_alloc Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 15/30] fixup: iommu/selftest: Sync .viommu_alloc() change to selftest Xu Yilun
2025-05-29 5:34 ` [RFC PATCH 16/30] iommufd/viommu: track the kvm pointer & its refcount in viommu core Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 17/30] iommufd/device: Add TSM Bind/Unbind for TIO support Xu Yilun
2025-06-02 12:43 ` Aneesh Kumar K.V
2025-06-03 6:20 ` Xu Yilun
2025-06-03 12:21 ` Jason Gunthorpe
2025-06-04 8:40 ` Aneesh Kumar K.V
2025-06-04 13:24 ` Jason Gunthorpe
2025-06-06 7:59 ` Aneesh Kumar K.V
2025-05-29 5:35 ` [RFC PATCH 18/30] iommufd/viommu: Add trusted IOMMU configuration handlers for vdev Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 19/30] vfio/pci: Add TSM TDI bind/unbind IOCTLs for TEE-IO support Xu Yilun
2025-06-01 10:45 ` Aneesh Kumar K.V
2025-06-02 14:43 ` Xu Yilun
2025-06-04 13:37 ` Aneesh Kumar K.V
2025-06-05 9:41 ` Xu Yilun
2025-06-05 15:09 ` Jason Gunthorpe
2025-06-06 3:25 ` Xu Yilun
2025-06-05 16:09 ` Aneesh Kumar K.V
2025-06-16 8:16 ` Aneesh Kumar K.V
2025-06-18 4:54 ` Xu Yilun
2025-06-05 12:03 ` Aneesh Kumar K.V
2025-06-05 15:10 ` Jason Gunthorpe
2025-06-05 16:17 ` Aneesh Kumar K.V
2025-06-05 16:33 ` Jason Gunthorpe
2025-06-06 4:26 ` Xu Yilun
2025-06-06 9:32 ` Aneesh Kumar K.V
2025-06-06 12:09 ` Jason Gunthorpe
2025-05-29 5:35 ` [RFC PATCH 20/30] vfio/pci: Do TSM Unbind before zapping bars Xu Yilun
2025-06-02 5:20 ` Aneesh Kumar K.V
2025-06-02 13:56 ` Xu Yilun
2025-06-02 14:00 ` Aneesh Kumar K.V
2025-06-03 4:50 ` Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 21/30] iommufd/vdevice: Add TSM Guest request uAPI Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 22/30] fixup! PCI/TSM: Change the guest request type definition Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 23/30] coco/tdx_tsm: Introduce a "tdx" subsystem and "tsm" device Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 24/30] coco/tdx_tsm: TEE Security Manager driver for TDX Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 25/30] coco/tdx_tsm: Add connect()/disconnect() handlers prototype Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 26/30] coco/tdx_tsm: Add bind()/unbind()/guest_req() " Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 27/30] PCI/TSM: Add PCI driver callbacks to handle TSM requirements Xu Yilun
2025-06-02 13:06 ` Aneesh Kumar K.V
2025-06-03 5:52 ` Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 28/30] vfio/pci: Implement TSM handlers for MMIO Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 29/30] iommufd/vdevice: Implement TSM handlers for trusted DMA Xu Yilun
2025-05-29 5:35 ` [RFC PATCH 30/30] coco/tdx_tsm: Manage TDX Module enforced operation sequences for Unbind Xu Yilun
2025-06-02 13:37 ` [RFC PATCH 00/30] Host side (KVM/VFIO/IOMMUFD) support for TDISP using TSM Jason Gunthorpe
2025-06-20 4:21 ` Xu Yilun
2025-06-11 1:55 ` Alexey Kardashevskiy
2025-06-21 1:07 ` Alexey Kardashevskiy
2025-06-25 10:45 ` Xu Yilun
2025-07-11 23:08 ` dan.j.williams
2025-07-15 11:09 ` Jonathan Cameron
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