bind pasid table API

[Jacob Pan <jacob.jun.pan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Hi Jean and All,

This is a follow-up on the LPC discussion we had last week.
(https://linuxplumbersconf.org/2017/ocw/proposals/4748)

My understanding is that the data structure below can satisfy the
needs from Intel (pointer + size) and AMD (pointer only). But ARM
pvIOMMU would need additional info to indicate the page table format.
Could you share your idea of the right addition for ARM such that we
can have a unified API?

/**
 * PASID table data used to bind guest PASID table to the host IOMMU. This will
 * enable guest managed first level page tables.
 * @ptr:	PASID table pointer
 * @size_order:	number of bits supported in the guest PASID table, must be less
 *		or equal than the host table size.
 */
struct pasid_table_info {
	__u64	ptr;
	__u64	size_order;
};

Thanks,

Jacob