On Tue, Jul 14, 2020 at 12:42:36PM +0100, Robin Murphy wrote:
> Oh bother - yes, this could have been masking all manner of bugs. That
> system will presumably also break if you managed to exhaust the 32-bit IOVA
> space such that the allocator moved up to the higher range anyway, or if you
> passed the XHCI through to a VM with a sufficiently wacky GPA layout, but I
> guess those are cases that simply nobody's run into yet.
>
> Does the firmware actually report any upper address constraint such that
> Sebastian's IVRS aperture patches might help?
No, it doesn't. I am not sure what the best way is to get these issues
found and fixed. I doubt they will be getting fixed when the allocation
pattern isn't changed, maybe we can put your changes behind a config
variable and start testing/reporting bugs/etc.
Regards,
Joerg
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
