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memory: Add reporting of supported page sizes

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Every IOMMU has some granularity which MemoryRegionIOMMUOps::translate
uses when translating, however this information is not available outside
the translate context for various checks.

This adds a get_min_page_size callback to MemoryRegionIOMMUOps and
a wrapper for it so IOMMU users (such as VFIO) can know the minimum
actual page size supported by an IOMMU.

As IOMMU MR represents a guest IOMMU, this uses TARGET_PAGE_SIZE
as fallback.

This removes vfio_container_granularity() and uses new helper in
memory_region_iommu_replay() when replaying IOMMU mappings on added
IOMMU memory region.

Backports the relevant parts of commit f682e9c244af7166225f4a50cc18ff296bb9d43e from qemu
This commit is contained in:
Alexey Kardashevskiy 2018-02-24 19:23:19 -05:00 committed by Lioncash
parent 2297527755
commit 096ca207af
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1 changed files with 2 additions and 0 deletions
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qemu/include/exec/memory.h
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@ -145,6 +145,8 @@ typedef struct MemoryRegionIOMMUOps MemoryRegionIOMMUOps;
struct MemoryRegionIOMMUOps {
/* Return a TLB entry that contains a given address. */
IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool is_write);
/* Returns minimum supported page size */
uint64_t (*get_min_page_size)(MemoryRegion *iommu);
};
struct MemoryRegion {