Messages in this thread |  | | | Date | Wed, 18 Oct 2006 23:16:26 +0200 | | From | Muli Ben-Yehuda <> | | Subject | Re: PCI-DMA: Disabling IOMMU |
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On Wed, Oct 18, 2006 at 05:51:57PM +0200, Sebastian Biallas wrote: > Prakash Punnoor wrote: > > Am Mittwoch 18 Oktober 2006 17:03 schrieben Sie: > >> Linux ouputs some strange "PCI-DMA: Disabling IOMMU" on booting. It's a > >> ALiveNF4G motherboard with an Athlon64 X2 running vanilla Linux 2.6.18.1 > >> (which supports all hardware out of the box, pretty cool). > >> > >> Should I worry about this IOMMU-disabling? All other Linux/IOMMU stuff I > >> found had AGP or BIOS messages nearby, but I only get this single > >> "PCI-DMA: Disabling IOMMU" line, without any hint. > > > > Unless you have >=4GB of RAM using IOMMU makes no sense, thus it gets > > disabled. > > Thanks for the answer (I thought that IOMMU is also used by VMMs like > XEN, for direct hardware access of the guest. But I might have > misunderstood this).
Nope, you got it right, that's one of the neater uses of an isolation capable IOMMU.
Cheers, Muli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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