On Tue, Sep 14, 2021 at 05:29:07PM +0200, Jan Beulich wrote:

I'm not convinced the swiotlb use describe there falls under "intended
use" - mapping a 1280x720 framebuffer in a single chunk? (As an aside,
the bottom of this page is also confusing, as following "Then we can
confirm the modified swiotlb size in the boot log:" there is a log
fragment showing the same original size of 64Mb.

It doesn't.  We also do not add hacks to the kernel for whacky out
of tree modules.