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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.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
[dwg: Removed an unnecessary calculation]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2016-06-21 11:14:01 +10:00 • committed by David Gibson
parent f0278900d3
commit f682e9c244
4 changed files with 37 additions and 15 deletions
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19
include/exec/memory.h
View file

@ -151,6 +151,8 @@ 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);
};
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@ -572,6 +574,16 @@ static inline bool memory_region_is_iommu(MemoryRegion *mr)
}
/**
* memory_region_iommu_get_min_page_size: get minimum supported page size
* for an iommu
*
* Returns minimum supported page size for an iommu.
*
* @mr: the memory region being queried
*/
uint64_t memory_region_iommu_get_min_page_size(MemoryRegion *mr);
/**
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
*
@ -596,16 +608,15 @@ void memory_region_register_iommu_notifier(MemoryRegion *mr, Notifier *n);
/**
* memory_region_iommu_replay: replay existing IOMMU translations to
* a notifier
* a notifier with the minimum page granularity returned by
* mr->iommu_ops->get_page_size().
*
* @mr: the memory region to observe
* @n: the notifier to which to replay iommu mappings
* @granularity: Minimum page granularity to replay notifications for
* @is_write: Whether to treat the replay as a translate "write"
* through the iommu
*/
void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n,
hwaddr granularity, bool is_write);
void memory_region_iommu_replay(MemoryRegion *mr, Notifier *n, bool is_write);
/**
* memory_region_unregister_iommu_notifier: unregister a notifier for