Re: Re: [PATCH 0/2] iommu/riscv: support range and non-leaf IOTLB invalidation

[fangyu.yu@linux.alibaba.com]

>> From: Fangyu Yu <fangyu.yu@linux.alibaba.com>
>>
>> This series adds support for two RISC-V IOMMU v1.0.1 invalidation extensions in
>> the RISC-V IOMMU driver:
>>
>>   - Address Range Invalidation (capabilities.S), which allows encoding a NAPOT
>>     address range in the IOTINVAL.{VMA,GVMA} ADDR operand when the S bit is set,
>>     reducing the number of invalidation commands for large or superpage-backed
>>     mappings.
>>
>>   - Non-leaf PTE Invalidation (capabilities.NL), which allows IOTINVAL.VMA with
>>     AV=1 and NL=1 to invalidate cached non-leaf PTE information for the given
>>     IOVA, addressing cases where updating mappings replaces a non-leaf entry.
>>
>> Patch 1 introduces the missing capability/operand definitions and switches the
>> IOTLB invalidation path to use NAPOT range invalidations when supported.
>>
>> Patch 2 adds the NL capability/operand definitions and extends the invalidation
>> path to optionally request non-leaf invalidation. When map_pages() replaces
>> non-leaf page-table entries, the driver invalidates the affected IOVA range with
>> non-leaf semantics.
>>
>> No functional changes are expected on hardware that does not advertise these
>> capabilities; the driver continues to fall back to the existing invalidation
>> behavior.
>>
>> Fangyu Yu (2):
>>   iommu/riscv: Add NAPOT range invalidation support for IOTINVAL
>>   iommu/riscv: Add non-leaf invalidation support
>
>These will need to be redone on top of the new page table code for riscv:
>
>https://patch.msgid.link/r/0-v3-9dbf0a72a51c+302-iommu_pt_riscv_jgg@nvidia.com
>
>It should get picked up early in the next cycle

Thanks. Acknowledged—I’ll rework the series on top of the new RISC-V IOMMU page
table patches once they’re in for the next cycle.

>
>Jason

Fangyu,
Thanks

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