commit 58eaa2174e99d9a05172d03fd2799ab8fd9e6f60
author Gonglei <arei.gonglei@huawei.com> Mon Feb 22 16:34:55 2016 +0800
committer Paolo Bonzini <pbonzini@redhat.com> Thu Feb 25 16:11:26 2016 +0100
tree ed5148b0d4e23bb0ea74372a85ecc3ba6fb3262a
parent 96c33a4523ee1abe382ce4ff3e82b90ba78aa186

exec: store RAMBlock pointer into memory region

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

diff --git a/exec.c b/exec.c
index 1f24500..4c0114a 100644
--- a/exec.c
+++ b/exec.c
@@ -1717,6 +1717,8 @@
         error_propagate(errp, local_err);
         return -1;
     }
+
+    mr->ram_block = new_block;
     return addr;
 }
 

include/exec/memory.h

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 @@
     bool global_locking;
     uint8_t dirty_log_mask;
     ram_addr_t ram_addr;
+    RAMBlock *ram_block;
     Object *owner;
     const MemoryRegionIOMMUOps *iommu_ops;
 

memory.c

diff --git a/memory.c b/memory.c
index 09041ed..b4451dd 100644
--- a/memory.c
+++ b/memory.c
@@ -912,6 +912,7 @@
     }
     mr->name = g_strdup(name);
     mr->owner = owner;
+    mr->ram_block = NULL;
 
     if (name) {
         char *escaped_name = memory_region_escape_name(name);