What's the host kernel? The NoSnoop patch was deprecated in favor of a host kernel solution that enables an interaction between vfio and KVM. That went into the v3.15 kernel, I think. Otherwise, I guess it's possible that your iommu reports that it supports snoop control in the iommu but it's broken or doesn't work for some reason. What does this report?
cat /sys/bus/pci/devices/0000\:01\:00.0/iommu/intel-iommu/ecap
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