Is there a quick way to check if system has IOMMU enabled in Linux?
I saw the following messages in /var/log/messages:
Apr 3 21:03:16 kernel: PCI-DMA: Disabling AGP.
Apr 3 21:03:16 kernel: PCI-DMA: aperture base @ f4000000 size 65536 KB
Apr 3 21:03:16 kernel: init_memory_mapping: 00000000f4000000-00000000f8000000
Apr 3 21:03:16 kernel: last_map_addr: f8000000 end: f8000000
Apr 3 21:03:16 kernel: PCI-DMA: using GART IOMMU.
Apr 3 21:03:16 kernel: PCI-DMA: Reserving 64MB of IOMMU area in the AGP
aperture
Does this mean IOMMU is enabed? And i don't need anything like iommu=force in
boot option, right?
CPU I used is the latest AMD Opteron Quad-core cpus. I didn't see any IOMMU
setting option in BIOS, only enabling virtulization option is there. Is this
the only option we need to enable?
Thanks
Eric
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