From: Nicolin Chen nicolinc@nvidia.com Sent: Friday, February 10, 2023 12:13 AM
On Thu, Feb 09, 2023 at 02:50:39AM +0000, Tian, Kevin wrote:
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From: Nicolin Chen nicolinc@nvidia.com Sent: Wednesday, February 8, 2023 5:18 AM
QEMU with this feature should have the vIOMMU maintain a cache of the guest io page table addresses and assign a unique IOAS to each unique guest page table.
I still didn't see a clear reply why above is required. Please elaborate.
Hmm..this piece was directly copied from Jason's inputs before I sent v1. And I thought he explained in the previous version. I can drop it in v3 if that makes you happy.
Jason's reply was:
I think the guidance is about the change to VFIO uAPI where it is now possible to change the domain attached, previously that was not possible
I cannot connect it to the above statement. Anyway if you think that guidance to userspace is necessary please connect it to the replace semantics to explain the motivation.