[PATCH v8 2/8] memory: Add interface to set iommu page size mask

[Bharat Bhushan <bbhushan2@marvell.com>]

Allow to set page size mask to be supported by iommu.
This is required to expose page size mask compatible with
host with virtio-iommu.

Signed-off-by: Bharat Bhushan <bbhushan2@marvell.com>
---
v7->v8:
 - new patch

 include/exec/memory.h | 20 ++++++++++++++++++++
 memory.c              | 10 ++++++++++
 2 files changed, 30 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index e85b7de99a..063c424854 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -355,6 +355,16 @@ typedef struct IOMMUMemoryRegionClass {
      * @iommu: the IOMMUMemoryRegion
      */
     int (*num_indexes)(IOMMUMemoryRegion *iommu);
+
+    /*
+     * Set supported IOMMU page size
+     *
+     * Optional method: if this is supported then set page size that
+     * can be supported by IOMMU. This is called to set supported page
+     * size as per host Linux.
+     */
+     void (*iommu_set_page_size_mask)(IOMMUMemoryRegion *iommu,
+                                      uint64_t page_size_mask);
 } IOMMUMemoryRegionClass;
 
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
@@ -1363,6 +1373,16 @@ int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion *iommu_mr,
  */
 int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
 
+/**
+ * memory_region_iommu_set_page_size_mask: set the supported pages
+ * size by iommu.
+ *
+ * @iommu_mr: the memory region
+ * @page_size_mask: supported page size mask
+ */
+void memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
+                                            uint64_t page_size_mask);
+
 /**
  * memory_region_name: get a memory region's name
  *
diff --git a/memory.c b/memory.c
index aeaa8dcc9e..14c8783084 100644
--- a/memory.c
+++ b/memory.c
@@ -1833,6 +1833,16 @@ static int memory_region_update_iommu_notify_flags(IOMMUMemoryRegion *iommu_mr,
     return ret;
 }
 
+void memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
+                                            uint64_t page_size_mask)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+
+    if (imrc->iommu_set_page_size_mask) {
+        imrc->iommu_set_page_size_mask(iommu_mr, page_size_mask);
+    }
+}
+
 int memory_region_register_iommu_notifier(MemoryRegion *mr,
                                           IOMMUNotifier *n, Error **errp)
 {
-- 
2.17.1