On Tue, Nov 04, 2025 at 11:19:43AM -0800, 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 nicolinc@nvidia.com
Thanks a lot.