[Qemu-devel] [PATCH RFC v2 13/17] memory: add MemoryRegionIOMMUOps.replay() callback

[Peter Xu <peterx@redhat.com>]

Originally we have one memory_region_iommu_replay() function, which is
the default behavior to replay the translations of the whole IOMMU
region. However, on some platform like x86, we may want our own replay
logic for IOMMU regions. This patch add one more hook for IOMMUOps for
the callback, and it'll override the default if set.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/exec/memory.h | 2 ++
 memory.c              | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index afe150c..a26763f 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -181,6 +181,8 @@ struct MemoryRegionIOMMUOps {
     void (*notify_flag_changed)(MemoryRegion *iommu,
                                 IOMMUNotifierFlag old_flags,
                                 IOMMUNotifierFlag new_flags);
+    /* Set this up to provide customized IOMMU replay function */
+    void (*replay)(MemoryRegion *iommu, IOMMUNotifier *notifier);
 };
 
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
diff --git a/memory.c b/memory.c
index 6e4c872..609ac67 100644
--- a/memory.c
+++ b/memory.c
@@ -1629,6 +1629,12 @@ void memory_region_iommu_replay(MemoryRegion *mr, IOMMUNotifier *n,
     hwaddr addr, granularity;
     IOMMUTLBEntry iotlb;
 
+    /* If the IOMMU has its own replay callback, override */
+    if (mr->iommu_ops->replay) {
+        mr->iommu_ops->replay(mr, n);
+        return;
+    }
+
     granularity = memory_region_iommu_get_min_page_size(mr);
 
     for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
-- 
2.7.4