DMAR faults with Adaptec 3405 controller.
Issue
- After adding
intel_iommu=onin kernel parameter KVM with PCI passthrough is not usable. - Dmesg contains the below logs after booting with
intel_iommu=on,
[ 0.669120] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O
[ 2.310875] dmar: DMAR:[DMA Write] Request device [02:01.0] fault addr ffbff000
DMAR:[fault reason 02] Present bit in context entry is clear
Environment
- Red Hat Enterprise Linux 7.0
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