Re: [PATCH 0/6] Make set_dev_pasid op supportting domain replacement

Yi Liu
2024-07-16T02:03:30Z

On 2024/7/15 20:19, Jason Gunthorpe wrote:
> On Mon, Jul 15, 2024 at 04:23:07PM +0800, Yi Liu wrote:
>>> Then the description is sort of like
>>>
>>> Replace is useful for iommufd/VFIO to provide perfect HW emulation in
>>> case the VM is expecting to be able to change a PASID on the fly. As
>>> AMD will only support PASID in VM's using nested translation where we
>>> don't use the set_dev_pasid API leave it disabled for now.
>>
>> Does it apply to SMMUv3 as well? IIRC. ARM SMMUv3 also has the CD table
>> (a.k.a PASID table) within the guest. And I think this is the major reason
>> for your above statement. right?
>
> It does, but it also supports replace so no need to explain why we
> don't enable it :)

got it. :)

--
Regards,
Yi Liu