Re: [Xen-devel] [PATCH RFC] VT-d: honor firmware-first mode in XSA-59 workaround code

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.05.14 at 18:33, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 21/05/14 17:09, Jan Beulich wrote:
>> When firmware-first mode is being indicated by firmware, we shouldn't
>> be modifying AER registers - these ar considered to be owned by
> 
> "these are"
> 
>> firmware in that case. Violating this is being reported to result in
>> SMI (or was it SCI?) storms.
> 
> SMM livelock.

IOW "SMI storm".

> The exact problem was a 2.6.32 kernel ignoring firmware-first and
> disabling reporting on the root ports but not endpoint devices, causing
> the SMM handler to fail to find the issue, and fail to clear the SMI.
> 
> However, as part of the investigation, we identified that Xen was also
> violating firmware-first as part of XSA-59

So has a problem solely with the XSA-59 workaround (i.e. without an
ignorant kernel) then been observed at all?

Jan


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