memory: Add reporting of supported page sizes
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>
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 4ab6800..e3829f7 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -151,6 +151,8 @@
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;
@@ -573,6 +575,16 @@
/**
+ * 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.
*
* @mr: the memory region that was changed
@@ -596,16 +608,15 @@
/**
* 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
