[Xen-devel] Re: [PATCH] AMD IOMMU: Fix an interrupt remapping issue

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 08.04.11 at 12:52, Wei Wang2 <wei.wang2@xxxxxxx> wrote:
> Some device could generate bogus interrupts if an IO-APIC RTE and an iommu 
> interrupt remapping entry are not consistent during 2 adjacent 64bits IO-APIC 
> 
> RTE updates. For example, if the 2nd operation updates destination bits in 
> RTE for SATA device and unmask it, in some case, SATA device will assert 
> ioapic pin to generate interrupt immediately using new destination but iommu 
> 
> could still translate it into the old destination, then dom0 would be 
> confused. To fix that, we sync up interrupt remapping entry with IO-APIC IRE 
> on every 32 bits operation and foward IOAPIC RTE updates after interrupt 
> remapping table has been changed. 
> 
> Jan, This patch fixes SATA device issue we observed (Bug #680824), please 
> review it. Thanks! 

Sure - once you attach the actual patch ;-)

Jan


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