[Xen-devel] VT-d interrup remapping errata workaround

["Jan Beulich" <JBeulich@xxxxxxxx>]

All,

just having spotted the backport of Linux commit 03bbcb2e I notice
a certain discrepancy with the Xen commit having the same purpose
as well as with the actual specification updates:

The Linux solution keys off of device IDs 3403 and 3406, as listed in
the specification update, but this way fails to cover the X58 chipset,
which has - under different numbers (62 and 69) - the same errata
(the Linux commit message also only mentions erratum 53 for the
55x0 chipsets, albeit I believe 47 is as much of an issue there as it is
for Xen).

The Xen solution keys off of ID 342e, with no explanation in the
commit description on where this association comes from.

I therefore wonder whether
- the Xen solution may have false positives
- the Linux solution would still have false negatives even after
  adding ID 3405

Jan


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