backport of dma_virt_ops related fixes to 5.10.y kernels

Hi All,

Below commits needs to be backported to 5.10.y kernels to avoid NULL pointer deref panic(while trying to access 'numa_node' from NULL 'dma_device'), @ Line: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/driver...)

commit:22dd4c707673129ed17e803b4bf68a567b2731db commit:8ecfca68dc4cbee1272a0161e3f2fb9387dc6930

The panic is observed at nvme host(provider/transport being SoftiWARP), while perfroming "nvme discover".

Hence, please backport the below patch series to '5.10.y' kernel. "https://lore.kernel.org/linux-iommu/20201106181941.1878556-1-hch@lst.de/"

Thanks, Krishnamraju.