[PATCH 02/13] memory: Introduce memory_region_iommu_set_iova_ranges

[Eric Auger <eric.auger@redhat.com>]

This helper will allow to convey information about valid
IOVA ranges to virtual IOMMUS.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 include/exec/memory.h | 26 ++++++++++++++++++++++++++
 softmmu/memory.c      | 15 +++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 184cb3a01b..f6fb99dd3f 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -519,6 +519,27 @@ struct IOMMUMemoryRegionClass {
      int (*iommu_set_page_size_mask)(IOMMUMemoryRegion *iommu,
                                      uint64_t page_size_mask,
                                      Error **errp);
+    /**
+     * @iommu_set_iova_ranges:
+     *
+     * Propagate information about the usable IOVA ranges for a given IOMMU
+     * memory region. Used for example to propagate host physical device
+     * reserved memory region constraints to the virtual IOMMU.
+     *
+     * Optional method: if this method is not provided, then the default IOVA
+     * aperture is used.
+     *
+     * @nr_ranges: number of IOVA ranges
+     *
+     * @iova_ranges: an array of @nr_ranges usable IOVA ranges
+     *
+     * Returns 0 on success, or a negative error. In case of failure, the error
+     * object must be created.
+     */
+     int (*iommu_set_iova_ranges)(IOMMUMemoryRegion *iommu,
+                                  uint32_t nr_ranges,
+                                  struct Range *iova_ranges,
+                                  Error **errp);
 };
 
 typedef struct RamDiscardListener RamDiscardListener;
@@ -1845,6 +1866,11 @@ int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
                                            uint64_t page_size_mask,
                                            Error **errp);
 
+int memory_region_iommu_set_iova_ranges(IOMMUMemoryRegion *iommu,
+                                        uint32_t nr_ranges,
+                                        struct Range *iova_ranges,
+                                        Error **errp);
+
 /**
  * memory_region_name: get a memory region's name
  *
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 7d9494ce70..07499457aa 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1905,6 +1905,21 @@ int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
     return ret;
 }
 
+int memory_region_iommu_set_iova_ranges(IOMMUMemoryRegion *iommu_mr,
+                                        uint32_t nr_ranges,
+                                        struct Range *iova_ranges,
+                                        Error **errp)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+    int ret = 0;
+
+    if (imrc->iommu_set_iova_ranges) {
+        ret = imrc->iommu_set_iova_ranges(iommu_mr, nr_ranges,
+                                          iova_ranges, errp);
+    }
+    return ret;
+}
+
 int memory_region_register_iommu_notifier(MemoryRegion *mr,
                                           IOMMUNotifier *n, Error **errp)
 {
-- 
2.41.0