[Qemu-devel] [PATCH 29/49] memory: split dirty bitmap into three

[Juan Quintela <quintela@redhat.com>]

After all the previous patches, spliting the bitmap gets direct.

Note: For some reason, I have to move DIRTY_MEMORY_* definitions to
the beginning of memory.h to make compilation work.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
---
 exec.c                         |  9 ++++++---
 include/exec/cpu-all.h         |  3 ++-
 include/exec/memory-internal.h |  9 +++------
 include/exec/memory.h          | 10 +++++-----
 4 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/exec.c b/exec.c
index db369dc..028eee4 100644
--- a/exec.c
+++ b/exec.c
@@ -1277,9 +1277,12 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
     new_ram_size = last_ram_offset() >> TARGET_PAGE_BITS;

     if (new_ram_size > old_ram_size) {
-        ram_list.phys_dirty = g_realloc(ram_list.phys_dirty, new_ram_size);
-        memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
-           0, size >> TARGET_PAGE_BITS);
+        int i;
+        for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
+            ram_list.dirty_memory[i] =
+                bitmap_zero_extend(ram_list.dirty_memory[i],
+                                   old_ram_size, new_ram_size);
+       }
     }
     cpu_physical_memory_set_dirty_range(new_block->offset, size);

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index b6998f0..4cb4b4a 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -21,6 +21,7 @@

 #include "qemu-common.h"
 #include "exec/cpu-common.h"
+#include "exec/memory.h"
 #include "qemu/thread.h"
 #include "qom/cpu.h"

@@ -459,7 +460,7 @@ typedef struct RAMBlock {
 typedef struct RAMList {
     QemuMutex mutex;
     /* Protected by the iothread lock.  */
-    uint8_t *phys_dirty;
+    unsigned long *dirty_memory[DIRTY_MEMORY_NUM];
     RAMBlock *mru_block;
     /* Protected by the ramlist lock.  */
     QTAILQ_HEAD(, RAMBlock) blocks;
diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 666490c..6fb1b64 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -44,7 +44,7 @@ static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
                                                       unsigned client)
 {
     assert(client < DIRTY_MEMORY_NUM);
-    return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] & (1 << client);
+    return test_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]);
 }

 /* read dirty bit (return 0 or 1) */
@@ -76,7 +76,7 @@ static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr,
                                                       unsigned client)
 {
     assert(client < DIRTY_MEMORY_NUM);
-    ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= (1 << client);
+    set_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]);
 }

 static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
@@ -89,11 +89,8 @@ static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
 static inline void cpu_physical_memory_clear_dirty_flag(ram_addr_t addr,
                                                        unsigned client)
 {
-    int mask = ~(1 << client);
-
     assert(client < DIRTY_MEMORY_NUM);
-
-    ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
+    clear_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]);
 }

 static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
diff --git a/include/exec/memory.h b/include/exec/memory.h
index d5e9d58..296d6ab 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -16,6 +16,11 @@

 #ifndef CONFIG_USER_ONLY

+#define DIRTY_MEMORY_VGA       0
+#define DIRTY_MEMORY_CODE      1
+#define DIRTY_MEMORY_MIGRATION 2
+#define DIRTY_MEMORY_NUM       3        /* num of dirty bits */
+
 #include <stdint.h>
 #include <stdbool.h>
 #include "qemu-common.h"
@@ -33,11 +38,6 @@
 typedef struct MemoryRegionOps MemoryRegionOps;
 typedef struct MemoryRegionMmio MemoryRegionMmio;

-#define DIRTY_MEMORY_VGA       0
-#define DIRTY_MEMORY_CODE      1
-#define DIRTY_MEMORY_MIGRATION 2
-#define DIRTY_MEMORY_NUM       3        /* num of dirty bits */
-
 struct MemoryRegionMmio {
     CPUReadMemoryFunc *read[3];
     CPUWriteMemoryFunc *write[3];
-- 
1.8.4.2