[Qemu-devel] [PULL 15/19] exec: store RAMBlock pointer into memory region

[Paolo Bonzini <pbonzini@redhat.com>]

From: Gonglei <arei.gonglei@huawei.com>

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 <arei.gonglei@huawei.com>
Message-Id: <1456130097-4208-2-git-send-email-arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 exec.c                | 2 ++
 include/exec/memory.h | 2 ++
 memory.c              | 1 +
 3 files changed, 5 insertions(+)

diff --git a/exec.c b/exec.c
index 1f24500..4c0114a 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;
     }
+
+    mr->ram_block = new_block;
     return addr;
 }
 
diff --git a/include/exec/memory.h b/include/exec/memory.h
index c92734a..683be46 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -34,6 +34,7 @@
 #include "qapi/error.h"
 #include "qom/object.h"
 #include "qemu/rcu.h"
+#include "qemu/typedefs.h"
 
 #define MAX_PHYS_ADDR_SPACE_BITS 62
 #define MAX_PHYS_ADDR            (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@@ -172,6 +173,7 @@ struct MemoryRegion {
     bool global_locking;
     uint8_t dirty_log_mask;
     ram_addr_t ram_addr;
+    RAMBlock *ram_block;
     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);
-- 
2.5.0