[v7,4/5] IOMMU: add specific replay function with default implemenation

Commit Message

Aviv B.D. Nov. 28, 2016, 3:51 p.m. UTC

From: "Aviv Ben-David" <[e-mail]>

The default implementation scans the address space and try to find
translation for each page, if exists.

This callback enables effiecent implementation for intel_iommu and other
subsystems with large address space.

Signed-off-by: Aviv Ben-David <[e-mail]>
---
 include/exec/memory.h | 4 ++++
 memory.c              | 8 ++++++++
 2 files changed, 12 insertions(+)

Patch

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 2d7ee54..a8b3701 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -180,6 +180,10 @@  struct MemoryRegionIOMMUOps {
     void (*notify_flag_changed)(MemoryRegion *iommu,
                                 IOMMUNotifierFlag old_flags,
                                 IOMMUNotifierFlag new_flags);
+    /* Called when region has been moved between iommu domains */
+    void (*replay)(MemoryRegion *mr,
+                         IOMMUNotifier *n,
+                         bool is_write);
 };
 
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
diff --git a/memory.c b/memory.c
index 9b88638..562d540 100644
--- a/memory.c
+++ b/memory.c
@@ -1624,6 +1624,14 @@  void memory_region_iommu_replay(MemoryRegion *mr, IOMMUNotifier *n,
     hwaddr addr, granularity;
     IOMMUTLBEntry iotlb;
 
+    /* If there is specific implementation, use it */
+    assert(memory_region_is_iommu(mr));
+    if (mr->iommu_ops && mr->iommu_ops->replay) {
+        return mr->iommu_ops->replay(mr, n, is_write);
+    }
+
+    /* No specific implementation for this iommu, fall back to default
+     * implementation */
     granularity = memory_region_iommu_get_min_page_size(mr);
 
     for (addr = 0; addr < memory_region_size(mr); addr += granularity) {