memory: add MemoryRegionIOMMUOps.replay() callback

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 adds one more hook for IOMMUOps for
the callback, and it'll override the default if set.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: \"Michael S. Tsirkin\" <mst@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1491562755-23867-6-git-send-email-peterx@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/memory.c b/memory.c
index ded4bf13d6..b782d5bc5a 100644
--- a/memory.c
+++ b/memory.c
@@ -1626,6 +1626,12 @@ 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) {