[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Multi-bridged PCIe devices (Was: Re: iommuu/vt-d issues with LSI MegaSAS (PERC5i))
>>> On 11.09.13 at 13:05, Gordan Bobic <gordan@xxxxxxxxxx> wrote: > I found this: > > http://lists.xen.org/archives/html/xen-devel/2010-06/msg00093.html > > while looking for a solution to a similar problem. I am > facing a similar issue with LSI (8408E, 3081E-R) and > Adaptec (31605) SAS cards. Was there ever a proper, more general > fix or workaround for this issue? > > These SAS cards experience these problems in dom0. When running > a vanilla kernel on bare metal, they work OK without intel_iommu > set. As soon as I set intel_iommu, the same thing happens (on > bare metal, not dom0). > > Clearly there is something badly broken with multiple layers > of bridges when it comes to IOMMU in my setup (Intel 5520 PCIe > root hub -> NF200 bridge -> Intel 80333 Bridge -> SAS controller) The link above has some (hackish) workarounds - did you try them? The link above, however, doesn't indicate any relationship to multiple bridges being in between, so it may not match what you're observing. In any event, seeing a hypervisor log with "iommu=debug" might shed further light on this: For one, we might be able to see which exact devices are present in the ACPI tables. And we would see which device(s) eventual faults originate from. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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