FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 571dbbd4d044e11c78bc077acb3ccef4c77b096e ("iommu/vt-d: Don't disable IR when it was previously enabled")

The following new message in kernel log may make end user confusing.

[    0.503764] DMAR-IR: IRQ remapping was enabled on dmar0 but we are not in kdump mode
[    0.512418] DMAR-IR: Failed to copy IR table for dmar0 from previous kernel
[    0.520501] DMAR-IR: IRQ remapping was enabled on dmar1 but we are not in kdump mode
[    0.529154] DMAR-IR: Failed to copy IR table for dmar1 from previous kernel
[    0.537077] DMAR-IR: Enabled IRQ remapping in x2apic mode


Thanks,
Ying Huang