[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Multi-bridged PCIe devices (Was: Re: iommuu/vt-d issues with LSI MegaSAS (PERC5i))
>>> On 11.09.13 at 14:45, Gordan Bobic <gordan@xxxxxxxxxx> wrote: > dmesg, xl dmesg, lspci -vvvnn and lspci -tvnn output is attached. > > I'll try adding one of my LSI cards and see the comparative > behaviour. Right now I don't even know if the phantom device > is on the SAS card or the motherboard. The Adaptec card being the only thing on bus 0f makes it pretty likely that this other device also is on that card. I guess the issue is mainly because the device itself is a PCI one, while the immediately upstream bridge (where I mean only the visible one) is PCIe. There _must_ be a PCIe-PCI bridge between them. And as long as firmware doesn't know about that bridge and the bridge doesn't properly handle config space accesses to it, such a device just can't be used with an IOMMU (without some yet to be invented workaround). Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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