Re: [Xen-devel] Multi-bridged PCIe devices (Was: Re: iommuu/vt-d issues with LSI MegaSAS (PERC5i))

["Jan Beulich" <JBeulich@xxxxxxxx>]

 >>> On 11.09.13 at 15:23, Gordan Bobic <gordan@xxxxxxxxxx> wrote:
> On Wed, 11 Sep 2013 14:03:14 +0100, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>> 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).
> 
>  You don't think Konrad's patch on the old thread would work
>  for getting it working in dom0?

For just Dom0 this might suffice, but for passthrough it surely
won't. And a sufficiently generic workaround patch should deal
with both imo.

Jan


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