[Qemu-devel] [PATCH 1/6] qemu-kvm: Introduce bit-based phys_ram_dirty for VGA, CODE and MIGRATION.

[Yoshiaki Tamura]

Replaces byte-based phys_ram_dirty bitmap with 
three bit-based phys_ram_dirty bitmap.
On allocation, it sets all bits in the bitmap.

Signed-off-by: Yoshiaki Tamura <address@hidden>
Signed-off-by: OHMURA Kei <address@hidden>
---
 exec.c |   22 +++++++++++++++++-----
 1 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/exec.c b/exec.c
index 9bcb4de..ba334e7 100644
--- a/exec.c
+++ b/exec.c
@@ -119,7 +119,9 @@ uint8_t *code_gen_ptr;
 
 #if !defined(CONFIG_USER_ONLY)
 int phys_ram_fd;
-uint8_t *phys_ram_dirty;
+unsigned long *phys_ram_vga_dirty;
+unsigned long *phys_ram_code_dirty;
+unsigned long *phys_ram_migration_dirty;
 uint8_t *bios_mem;
 static int in_migration;
 
@@ -2659,10 +2661,20 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
     new_block->next = ram_blocks;
     ram_blocks = new_block;
 
-    phys_ram_dirty = qemu_realloc(phys_ram_dirty,
-        (last_ram_offset + size) >> TARGET_PAGE_BITS);
-    memset(phys_ram_dirty + (last_ram_offset >> TARGET_PAGE_BITS),
-           0xff, size >> TARGET_PAGE_BITS);
+    if (BITMAP_SIZE(last_ram_offset + size) != BITMAP_SIZE(last_ram_offset)) {
+        phys_ram_vga_dirty = qemu_realloc(phys_ram_vga_dirty,
+            BITMAP_SIZE(last_ram_offset + size));
+        phys_ram_code_dirty = qemu_realloc(phys_ram_code_dirty,
+            BITMAP_SIZE(last_ram_offset + size));
+        phys_ram_migration_dirty = qemu_realloc(phys_ram_migration_dirty,
+            BITMAP_SIZE(last_ram_offset + size));
+        memset((uint8_t *)phys_ram_vga_dirty +
+               BITMAP_SIZE(last_ram_offset), 0xff, BITMAP_SIZE(size));
+        memset((uint8_t *)phys_ram_code_dirty + 
+               BITMAP_SIZE(last_ram_offset), 0xff, BITMAP_SIZE(size));
+        memset((uint8_t *)phys_ram_migration_dirty +
+               BITMAP_SIZE(last_ram_offset), 0xff, BITMAP_SIZE(size));
+    }
 
     last_ram_offset += size;
 
-- 
1.7.0.31.g1df487