Re: [PATCH 4/6] iommufd/hw_pagetable: Support allocating nested parent domain

Yi Liu
2023-09-26T05:48:01Z

On 2023/9/26 13:32, Tian, Kevin wrote:
>> From: Liu, Yi L <yi.l.liu@intel.com>
>> Sent: Tuesday, September 19, 2023 5:25 PM
>>
>> @@ -83,6 +83,9 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx,
>> struct iommufd_ioas *ioas,
>>
>> lockdep_assert_held(&ioas->mutex);
>>
>> + if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ops-
>>> domain_alloc_user)
>> + return ERR_PTR(-EOPNOTSUPP);
>> +
>
> if (flags && !ops->domain_alloc_user)
> return ERR_PTR(-EOPNOTSUPP);
>
> as long as flags is non-zero we'll need the new alloc_user ops.

yes.

--
Regards,
Yi Liu