FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 2966d9566beb39c53477c96525820b9415de7a7d ("iommu/vt-d: Prepare for killing function irq_remapping_supported()")

We found something new as below in dmesg after the commit.


[    0.032167] This system BIOS has enabled interrupt remapping
[    0.032167] on a chipset that contains an erratum making that
[    0.032167] feature unstable.  To maintain system stability
[    0.032167] interrupt remapping is being disabled.  Please
[    0.032167] contact your BIOS vendor for an update


Thanks,
Huang, Ying