Re: [PATCH v4 05/11] iommu/sva: Assign a PASID to mm on PASID allocation and free it on mm exit
From: Dave Hansen
Date: Thu Apr 28 2022 - 12:35:44 EST
On 4/28/22 09:01, Jean-Philippe Brucker wrote:
>> But, this misses an important point: even after the address space is
>> gone, the PASID will still be programmed into a device. Device drivers
>> might, for instance, still need to flush operations that are outstanding
>> and need to use that PASID. They do this at ->release() time.
> It's not really clear which release() this is. For us it's file descriptor
> release() (not MMU notifier release(), which is how I initially understood
> this sentence)
OK, maybe that should be: "file->release() time" to make it more clear.