Messages in this thread | | | Subject | Re: [iommu/vt] c9ac3b69cf: WARNING:at_drivers/iommu/intel-iommu.c:#dmar_parse_one_rmrr | From | Barret Rhoden <> | Date | Mon, 3 Feb 2020 11:02:12 -0500 |
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Hi -
On 2/3/20 4:10 AM, kernel test robot wrote: > FYI, we noticed the following commit (built with gcc-7): > > commit: c9ac3b69cfdbc46a0504fa353b5126827e4b0bdb ("iommu/vt-d: skip RMRR entries that fail the sanity check") > https://github.com/0day-ci/linux/commits/Barret-Rhoden/iommu-vt-d-bad-RMRR-workarounds/20200109-051817
This looks like your system's firmware might be buggy, which is what the warning is all about.
From the kmesg:
> kern :info : [ 2.912758] DMAR: RMRR base: 0x0000009f271000 end: 0x0000009f290fff > kern :info : [ 2.919226] DMAR: RMRR base: 0x000000a1800000 end: 0x000000a3ffffff > kern :err : [ 2.925692] DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x00000000a1800000-0x00000000a3ffffff], contact BIOS vendor for fixes > kern :warn : [ 2.939636] ------------[ cut here ]------------ > kern :warn : [ 2.944436] Your BIOS is broken; bad RMRR [0x00000000a1800000-0x00000000a3ffffff] > BIOS vendor: Dell Inc.; Ver: 1.2.8; Product Version:
The e820 map has this:
> kern :info : [ 0.000000] BIOS-e820: [mem 0x00000000a0000000-0x00000000a00fffff] reserved > kern :info : [ 0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved > kern :info : [ 0.000000] BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
The region 0xa1800000-0xa3ffffff isn't explicitly reserved (it's not listed at all), which the IOMMU-folk say is the fault of the firmware.
My commit made it so that it merely spits out a warning, instead of failing to use the IOMMU at all.
Thanks,
Barret
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