Re: [PATCH v1 0/8] Add IO page table replacement support

[Jason Gunthorpe]

On Fri, Feb 03, 2023 at 08:09:30AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> > Sent: Thursday, February 2, 2023 3:05 PM
> > 
> > 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 didn't get why we impose such requirement to userspace.

I read this as implementation guidance for qemu. qemu can do what it
wants of course

Jason