It sounds a bit strange, that the sw-iommu is used in first place. IMO
this is only necessary for 64bit. I am not using Xen myself so maybe the
question is dumb, but anyway: the host is running exactly the same
kernel as the guest? Also, have you tried the effect of swiotlb=off?

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linux-image-2.6.24-* w/ aic79xx crash under heavy I/O load
https://bugs.launchpad.net/bugs/238118
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