Re: [RFC 8/8] iommu/vt-d: Add set_dev_pasid callback for nested domain

Yi Liu
2023-10-10T03:32:44Z

On 2023/9/27 16:09, Tian, Kevin wrote:
>> From: Baolu Lu <baolu.lu@linux.intel.com>
>> Sent: Wednesday, September 27, 2023 3:58 PM
>>
>> On 2023/9/27 15:52, Tian, Kevin wrote:
>>>> From: Liu, Yi L<yi.l.liu@intel.com>
>>>> Sent: Tuesday, September 26, 2023 5:27 PM
>>>>
>>>> From: Lu Baolu<baolu.lu@linux.intel.com>
>>>>
>>>> This allows the upper layers to set a nested type domain to a PASID of a
>>>> device if the PASID feature is supported by the IOMMU hardware.
>>>>
>>>> Signed-off-by: Lu Baolu<baolu.lu@linux.intel.com>
>>>> Signed-off-by: Yi Liu<yi.l.liu@intel.com>
>>>> ---
>>>> drivers/iommu/intel/nested.c | 47
>>>> ++++++++++++++++++++++++++++++++++++
>>>> 1 file changed, 47 insertions(+)
>>> pasid can be attached to either user hwpt or kernel hwpt.
>>>
>>> We should also introduce a set_dev_pasid callback for non-nest domain
>> ops.
>>
>> We already have the code in Linus' tree. The idxd driver uses it for
>> kernel DMA with pasid.
>>
>
> ah, I forgot. 😊 probably can mention it in the commit message.

sure.

--
Regards,
Yi Liu