RE: [Xen-devel] We still have to disable vtd for old chipset?

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

>
>Are you sure ?  My understanding (admittedly half-remembered from some
>technical note that came with the motherboard replacement to bring our
>pre-C0 pre-production VT-d system up to date) was that the iommu page
>table format is different in the pre-C0 chipsets.
>
>That would explain why pagetable sharing between iommu and normal mmu
>is not possible with those chipsets.  But it also makes those pre-C0
>chipsets completely incompatible with all of the code in Xen, because
>Xen doesn't know anything about those pre-C0 pagetables ?  (And isn't
>going to be taught.)
>

I think the issues was the pre-c0 seaburg was force checking 0 for some
bits by the cpu.  It's just something for a quick try.  I don't have
access to pre-c0 HW anymore.

allen

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