[from kern.log]
> Jan 18 13:21:31 ubuntu-server kernel: [ 3.997351] DMAR: DRHD: handling fault status reg 2
> Jan 18 13:21:31 ubuntu-server kernel: [ 3.997647] DMAR: [INTR-REMAP] Request device [64:00.5] fault index 0 [fault reason 37] Blocked a compatibility format interrupt request
The DMAR error is the known issue. Upstream commit 2565e5b69c44 ("PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU") has fixed the issue. Please consider to include the commit.
[from kern.log]
> Jan 18 13:21:31 ubuntu-server kernel: [ 3.997351] DMAR: DRHD: handling fault status reg 2
> Jan 18 13:21:31 ubuntu-server kernel: [ 3.997647] DMAR: [INTR-REMAP] Request device [64:00.5] fault index 0 [fault reason 37] Blocked a compatibility format interrupt request
The DMAR error is the known issue. Upstream commit 2565e5b69c44 ("PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU") has fixed the issue. Please consider to include the commit.
Fix commit: https:/ /git.kernel. org/pub/ scm/linux/ kernel/ git/torvalds/ linux.git/ commit/ ?id=2565e5b69c4 4b4e42469afea3c c5a97e74d1ed45