[PATCH v3 01/32] iommu: introduce iova_to_phys_length in iommu_domain_ops

[Baolu Lu]

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<guanghuifeng at linux.alibaba.com>
> Acked-by: Shiqiang Zhang<shiyu.zsq at linux.alibaba.com>
> Acked-by: Simon Guo<wei.guo.simon at linux.alibaba.com>
> ---
>   drivers/iommu/iommu.c | 50 ++++++++++++++++++++++++++++++++++++++-----
>   include/linux/iommu.h |  9 ++++++++
>   2 files changed, 54 insertions(+), 5 deletions(-)

Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>