memory: introduce memory_region_unmap_iommu_notifier_range()

This patch introduces a new helper to unmap the range of a specific
IOMMU notifier.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230223065924.42503-4-jasowang@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 23 insertions, 0 deletions

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 2e602a2fad..6fa0b071f0 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1732,6 +1732,16 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
                                     IOMMUTLBEvent *event);
 
 /**
+ * memory_region_unmap_iommu_notifier_range: notify a unmap for an IOMMU
+ *                                           translation that covers the
+ *                                           range of a notifier
+ *
+ * @notifier: the notifier to be notified
+ */
+void memory_region_unmap_iommu_notifier_range(IOMMUNotifier *n);
+
+
+/**
  * memory_region_register_iommu_notifier: register a notifier for changes to
  * IOMMU translation entries.
  *
diff --git a/softmmu/memory.c b/softmmu/memory.c
index da7d846619..4699ba55ec 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1996,6 +1996,19 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
     }
 }
 
+void memory_region_unmap_iommu_notifier_range(IOMMUNotifier *n)
+{
+    IOMMUTLBEvent event;
+
+    event.type = IOMMU_NOTIFIER_UNMAP;
+    event.entry.target_as = &address_space_memory;
+    event.entry.iova = n->start;
+    event.entry.perm = IOMMU_NONE;
+    event.entry.addr_mask = n->end - n->start;
+
+    memory_region_notify_iommu_one(n, &event);
+}
+
 void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
                                 int iommu_idx,
                                 IOMMUTLBEvent event)