[RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp) page table support

[fangyu.yu at linux.alibaba.com]

>> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct pt_iommu_riscv_64 *iommu_table,
>>  	case 57:
>>  		pt_top_set_level(&table->common, 4);
>>  		break;
>> +	/*
>> +	 * Second-stage (iohgatp): Sv39x4 / Sv48x4 / Sv57x4.
>> +	 * The top level is the same as for the first-stage counterpart.
>> +	 */
>> +	case 41:
>> +		pt_top_set_level(&table->common, 2);
>> +		table->second_stage = true;
>> +		break;
>
>Second stage needs to be an explicit PT_FEAT not implicitly deduced
>based on the vasz.

Agreed. I will add an explicit PT_FEAT_RISCV_SECOND_STAGE flag and
stop deriving second-stage semantics from vasz.

Thanks,
Fangyu

>
>Jason