8 Jan
2026
8 Jan
'26
12:54 a.m.
On Wed, Jan 07, 2026 at 11:54:09PM +0000, David Matlack wrote:
On 2026-01-07 02:13 PM, Alex Mastro wrote:
Test MMIO-backed DMA mappings by iommu_map()-ing mmap'ed BAR regions.
Thanks for adding this!
Also update vfio_pci_bar_map() to align BAR mmaps for efficient huge page mappings.
Only vfio_type1 variants are tested; iommufd variants can be added once kernel support lands.
Are there plans to support mapping BARs via virtual address in iommufd? I thought the plan was only to support via dma-bufs. Maybe Jason can confirm.
Only dmabuf.
Assuming not, should we add negative tests here to make sure iommufd does not allow mapping BARs?
Yes
And then we can add dma-buf tests in a future commit.
Yes
Jason