[PATCH] memory: Optimize replay of guest mapping

[Zhenzhong Duan]

On x86, there are two notifiers registered due to vtd-ir memory region
splitting the whole address space. During replay of the address space
for each notifier, the whole address space is scanned which is
unnecessory.

We only need to scan the space belong to notifier montiored space.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
Tested only on x86 with a net card passed to guest, ping/ssh pass.

 hw/i386/intel_iommu.c | 2 +-
 softmmu/memory.c      | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 98a5c304a7d7..6b1de80e8573 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3831,7 +3831,7 @@ static void vtd_iommu_replay(IOMMUMemoryRegion *iommu_mr, 
IOMMUNotifier *n)
                 .domain_id = vtd_get_domain_id(s, &ce, vtd_as->pasid),
             };
 
-            vtd_page_walk(s, &ce, 0, ~0ULL, &info, vtd_as->pasid);
+            vtd_page_walk(s, &ce, n->start, n->end, &info, vtd_as->pasid);
         }
     } else {
         trace_vtd_replay_ce_invalid(bus_n, PCI_SLOT(vtd_as->devfn),
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 9d64efca269b..f096716e6e78 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1923,7 +1923,6 @@ uint64_t 
memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr)
 
 void memory_region_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
 {
-    MemoryRegion *mr = MEMORY_REGION(iommu_mr);
     IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
     hwaddr addr, granularity;
     IOMMUTLBEntry iotlb;
@@ -1936,7 +1935,7 @@ void memory_region_iommu_replay(IOMMUMemoryRegion 
*iommu_mr, IOMMUNotifier *n)
 
     granularity = memory_region_iommu_get_min_page_size(iommu_mr);
 
-    for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
+    for (addr = n->start; addr < n->end; addr += granularity) {
         iotlb = imrc->translate(iommu_mr, addr, IOMMU_NONE, n->iommu_idx);
         if (iotlb.perm != IOMMU_NONE) {
             n->notify(n, &iotlb);
-- 
2.25.1