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 <[email protected]>
Do you plan to provide P2P support with IOMMUFD for QEMU ?
Thanks,
C.
