Comment 5 for bug 1869006

14:57 < aw> hrw: under /sys/kernel/iommu_groups/ there's a reserved_regions file for every group. cat the ones associated with the groups for these devices

14:59 < hrw> 14:58 (0s) hrw@puchatek:28$ cat reserved_regions
14:59 < hrw> 0x00000000fee00000 0x00000000feefffff msi
14:59 < hrw> 0x000000fd00000000 0x000000ffffffffff reserved

14:59 < hrw> 14:59 (2s) hrw@puchatek:27$ cat reserved_regions
14:59 < hrw> 0x00000000fee00000 0x00000000feefffff msi
14:59 < hrw> 0x000000fd00000000 0x000000ffffffffff reserved

15:00 < aw> of course, you're on an x86 host, arm has no concept of not mapping memory at 0xfee00000