ok when i type the following it is unable to find the file to patch:

sudo patch -p1 < iommu-amd-flush-IOTLB-for-specific-domains-only.patch

It displays the following:

can't find file to patch at input line 5
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
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|diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
|index 98940d1..6a9a048 100644
|--- a/drivers/iommu/amd_iommu.c
|+++ b/drivers/iommu/amd_iommu
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