Commit f036c7fa0ab6 ("iommu/vt-d: Check VT-d RMRR region in BIOS is
reported as reserved") caused a machine to fail to boot for me, but only
after a kexec.Buggy firmware provided an RMRR entry with base and end both == 0. That is an invalid RMRR format, and only happens to pass the RMRR sanity check. After a kexec, that entry fails the RMRR sanity check, due to a slight change in the first e820 mapping. See the v1 link for details. v1->v2: v1: https://lore.kernel.org/lkml/20191211194606.87940-1-b...@google.com/ - Added the TAINT_FIRMWARE_WORKAROUND - Dropped the commit that treated missing e820 regions as "RMRR OK" Barret Rhoden (2): iommu/vt-d: skip RMRR entries that fail the sanity check iommu/vt-d: skip invalid RMRR entries drivers/iommu/intel-iommu.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) -- 2.24.1.735.g03f4e72817-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
