Re: [PATCH v3] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests.

[Christoph Hellwig]

On Thu, Nov 05, 2020 at 02:06:49PM -0500, Konrad Rzeszutek Wilk wrote:
> .
> > > Right, so I am wondering if we can do this better.
> > > 
> > > That is you are never going to get any 32-bit devices with SEV right? That
> > > is there is nothing that bounds you to always use the memory below 4GB?
> > > 
> > 
> > We do support 32-bit PCIe passthrough devices with SEV.
> 
> Ewww..  Which devices would this be?

There is still some new broken shit like that that keeps appearing.
GPU is pretty famouts for supporting less than 64-bit addressing,
even if it isn't all the way down to 32-bit.