> From: Robin Murphy <robin.murphy@xxxxxxx> > Sent: Friday, April 21, 2023 7:35 PM > > > intel-iommu sets RELAXABLE for USB and GPU assuming their RMRR region > > is not used post boot. > > > > Presumably same policy can be applied to AMD too. > > > > ARM RMR reports an explicit flag (ACPI_IORT_RMR_REMAP_PERMITTED) to > > mark out whether a RMR region is relaxable. I'm not sure whether > USB/GPU > > is already covered. > > Arm systems have no legacy of needing to offer compatibility with a PC > BIOS from the 1990s, so PS/2 or VGA emulation is a non-issue for us ;) > Make sense. On the other hand if AMD wants the similar exempt on USB/GPU they can do it as intel-iommu does.
