On 10/28/25 2:41 PM, Jason Gunthorpe wrote:
> On Tue, Oct 28, 2025 at 02:21:32PM +0100, Eric Auger wrote:
>>
>> On 10/28/25 1:16 PM, Jason Gunthorpe wrote:
>>> On Mon, Oct 27, 2025 at 10:53:10AM -0700, Nicolin Chen wrote:
>>>
>>>> Hmm, that sounds a legit reason, though adding the ATS support to
>>>> the emulated SMMUv3 isn't seemingly a small effort...
>>> What is "emulated ATS" anyhow?
>> I guess it means implementing ATS translation requests and capability to
>> send ATS invalidations. something like:
>>
>> https://lore.kernel.org/all/[email protected]/
> Why would you even want this? The cover letter didn't explain what the
> point was.
well I am just concerned about exposing ATS support to emulated EPs
while we actually do not support it.
>
> qemu emulating two levels of IOTLB caching in software, with a
> software page table walk?? Why??
About the actual use case for ATS emulation you'd rather ask the
contributor, early SW development, IP development?
Eric
>
> Jason
>
