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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello Nicolin, On 11/4/25 20:19, Nicolin Chen wrote: > On Sun, Nov 02, 2025 at 10:00:48AM +0200, Leon Romanovsky wrote: >> Changelog: >> v6: >> * Fixed wrong error check from pcim_p2pdma_init(). >> * Documented pcim_p2pdma_provider() function. >> * Improved commit messages. >> * Added VFIO DMA-BUF selftest. >> * Added __counted_by(nr_ranges) annotation to struct vfio_device_feature_dma_buf. >> * Fixed error unwind when dma_buf_fd() fails. >> * Document latest changes to p2pmem. >> * Removed EXPORT_SYMBOL_GPL from pci_p2pdma_map_type. >> * Moved DMA mapping logic to DMA-BUF. >> * Removed types patch to avoid dependencies between subsystems. >> * Moved vfio_pci_dma_buf_move() in err_undo block. >> * Added nvgrace patch. > > I have verified this v6 using Jason's iommufd dmabuf branch: > https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf/ > > by drafting a QEMU patch on top of Shameer's vSMMU v5 series: > https://github.com/nicolinc/qemu/commits/wip/iommufd_dmabuf/ > > with that, I see GPU BAR memory be correctly fetched in the QEMU: > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 0", offset: 0x0, size: 0x1000000 > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 2", offset: 0x0, size: 0x44f00000 > vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 4", offset: 0x0, size: 0x17a0000000 > > Tested-by: Nicolin Chen Do you plan to provide P2P support with IOMMUFD for QEMU ? Thanks, C.