[RFC PATCH 10/11] iommupt: Add RISC-V dirty tracking PTE ops

[Jason Gunthorpe]

On Tue, Apr 28, 2026 at 09:13:58PM +0800, fangyu.yu at linux.alibaba.com wrote:
> From: Fangyu Yu <fangyu.yu at linux.alibaba.com>
> 
> Implement the three dirty-tracking hooks required by the generic page
> table framework for the RISC-V format:
> 
>   pt_entry_is_write_dirty():
>     Check the D bit (bit 7) in the PTE.
> 
>   pt_entry_make_write_clean():
>     Clear the D bit across the full contiguous range.
> 
>   pt_entry_make_write_dirty():
>     Atomically set D via try_cmpxchg64() on a single PTE.
> 
> Signed-off-by: Fangyu Yu <fangyu.yu at linux.alibaba.com>
> ---
>  drivers/iommu/generic_pt/fmt/riscv.h | 43 ++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)

This patch should probably go earlier in your series, before adding
the alloc_paging flags at least.

Jason