RE: [Xen-devel] Xen Advisory 5 (CVE-2011-3131) IOMMU fault livelock

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.09.11 at 02:07, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
> Catching up on an old thread ...
> 
> If I understand correctly, the proposal is to check for VT-d faults in 
> do_softirq() handler.  If so, we probably don't even need to enable VT-d MSI 
> interrupt at all if iommu_debug is not set, basically handling VT-d faults 
> with polling method.

No, I don't think switching to polling mode was implied here. My thinking
was rather along the lines of a dedicated softirq that the interrupt
handler would raise, for the bulk of the handling to take place there.

Jan


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