[Qemu-devel] [PATCH 1/3] exec: store RAMBlock pointer into memory region

[Gonglei]

Each RAM memory region has a unique corresponding RAMBlock.
In the current realization, the memory region only stored
the ram_addr which means the offset of RAM address space,
We need to qurey the global ram.list to find the ram block
by ram_addr if we want to get the ram block, which is very
expensive.

Now, we store the RAMBlock pointer into memory region
structure. So, if we know the mr, we can easily get the
RAMBlock.

Signed-off-by: Gonglei <address@hidden>
---
 exec.c                | 2 ++
 include/exec/memory.h | 1 +
 memory.c              | 1 +
 3 files changed, 4 insertions(+)

diff --git a/exec.c b/exec.c
index 1f24500..e29e369 100644
--- a/exec.c
+++ b/exec.c
@@ -1717,6 +1717,8 @@ ram_addr_t qemu_ram_alloc_internal(ram_addr_t size, 
ram_addr_t max_size,
         error_propagate(errp, local_err);
         return -1;
     }
+    /* store the ram block pointer into memroy region */
+    mr->ram_block = new_block;
     return addr;
 }
 
diff --git a/include/exec/memory.h b/include/exec/memory.h
index c92734a..23e2e3e 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -172,6 +172,7 @@ struct MemoryRegion {
     bool global_locking;
     uint8_t dirty_log_mask;
     ram_addr_t ram_addr;
+    void *ram_block;   /* RAMBlock pointer */
     Object *owner;
     const MemoryRegionIOMMUOps *iommu_ops;
 
diff --git a/memory.c b/memory.c
index 09041ed..b4451dd 100644
--- a/memory.c
+++ b/memory.c
@@ -912,6 +912,7 @@ void memory_region_init(MemoryRegion *mr,
     }
     mr->name = g_strdup(name);
     mr->owner = owner;
+    mr->ram_block = NULL;
 
     if (name) {
         char *escaped_name = memory_region_escape_name(name);
-- 
1.8.5.2