On Mon, Apr 01, 2013 at 02:45:18PM +0900, Takao Indoh wrote:
> <Current flow on kdump boot>
> enable_IR
> intel_enable_irq_remapping
> iommu_disable_irq_remapping <== IRES/QIES/TES disabled here
> dmar_disable_qi <== do nothing
> dmar_enable_qi <== QIES enabled
> intel_setup_irq_remapping <== IRES enabled
But what we want to do here in the kdumo case is to disable translation
too, right? Because the former kernel might have translation and
irq-remapping enabled and the kdump kernel might be compiled without
support for dma-remapping. So if we don't disable translation here too
the kdump kernel is unable to do DMA.
I agree that disabling translation should be a bit more explicit instead
of the current code.
Joerg
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