On 6/3/26 23:17, Guanghui Feng wrote:
Add iova_to_phys_length callback to struct iommu_domain_ops alongside
the existing iova_to_phys. The new callback returns both the physical
address and the PTE mapping page size in a single page table walk.
Add iommu_iova_to_phys_length() core function that:
- Checks ops->iova_to_phys_length first (preferred path)
- Falls back to ops->iova_to_phys for unmigrated drivers
This enables callers like VFIO to efficiently traverse IOVA space
by actual mapping granularity instead of fixed PAGE_SIZE steps.
Signed-off-by: Guanghui Feng<[email protected]>
Acked-by: Shiqiang Zhang<[email protected]>
Acked-by: Simon Guo<[email protected]>
---
drivers/iommu/iommu.c | 50 ++++++++++++++++++++++++++++++++++++++-----
include/linux/iommu.h | 9 ++++++++
2 files changed, 54 insertions(+), 5 deletions(-)
Reviewed-by: Lu Baolu <[email protected]>
