Re: [Xen-devel] [PATCH V2] amd iommu: re-enable iommu msi if dom0 disabled it

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.06.12 at 14:13, Wei Wang <wei.wang2@xxxxxxx> wrote:
> Am 12.06.2012 18:43, schrieb Jan Beulich:
>> That is precisely what I suggested in my response to the first
>> version of this patch, and I'd also volunteer to look into putting
>> together a first draft implementation if we sort of agree that
>> this is the way to go.
> 
> Cool! thanks for doing that. Looking forward to it in Xen 4.2 since 
> iommu msi is really broken with recent Linux dom0...

That's unlikely to be for 4.2 - it's going to have a reasonable risk
of regressions, and functionality like that I don't think is nice to
rush into a feature frozen tree, the more that it provides a
workaround for the combination of questionable design and an
improper kernel side fix.

Have you at all considered getting this fixed on the kernel side?
As I don't have direct access to any AMD IOMMU capable
system - can one, other than by enumerating the respective
PCI IDs or reading ACPI tables, reasonably easily identify the
devices in question (e.g. via vendor/class/sub-class or some
such)? That might permit skipping those in the offending kernel
code...

Jan


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