[Qemu-devel] [PATCH 1/3] qemu-kvm: Wrap phys_ram_dirty with additional inline functions.

[OHMURA Kei <ohmura.kei@lab.ntt.co.jp>]

We think access phys_ram_dirty through inline functions is better
than directly for encoupseling reason.

We devided the ram in a 64 pages block. Each block has a counter, which is
stored in phys_ram_dirty_by_word. It shows the number of dirty pages.
We will find the 64 pages block is dirty or non-dirty using
phys_ram_dirty_by_word.

Signed-off-by: OHMURA Kei <ohmura.kei@lab.ntt.co.jp>
---
 cpu-all.h  |   74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 cpu-defs.h |    1 +
 2 files changed, 75 insertions(+), 0 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index 8ed76c7..2251f14 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -168,6 +168,33 @@ typedef union {
 } CPU_QuadU;
 #endif
 
+static inline unsigned long unroll_flags_to_ul(int flags)
+{
+    unsigned long ret = 0, flags_ul = (unsigned long)flags;
+
+#if TARGET_LONG_SIZE == 4
+    ret |= flags_ul <<  0;
+    ret |= flags_ul <<  8;
+    ret |= flags_ul << 16;
+    ret |= flags_ul << 24;
+#elif TARGET_LONG_SIZE == 8
+    ret |= flags_ul <<  0;
+    ret |= flags_ul <<  8;
+    ret |= flags_ul << 16;
+    ret |= flags_ul << 24;
+    ret |= flags_ul << 32;
+    ret |= flags_ul << 40;
+    ret |= flags_ul << 48;
+    ret |= flags_ul << 56;
+#else
+    int i;
+    for (i = 0; i < sizeof(unsigned long); i++)
+        ret |= flags_ul << (i * 8);
+#endif
+
+    return ret;
+}
+
 /* CPU memory access without any memory or io remapping */
 
 /*
@@ -847,6 +874,7 @@ int cpu_str_to_log_mask(const char *str);
 
 extern int phys_ram_fd;
 extern uint8_t *phys_ram_dirty;
+extern int *phys_ram_dirty_by_word;
 extern ram_addr_t ram_size;
 extern ram_addr_t last_ram_offset;
 extern uint8_t *bios_mem;
@@ -882,6 +910,11 @@ static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
     return phys_ram_dirty[addr >> TARGET_PAGE_BITS] == 0xff;
 }
 
+static inline int cpu_physical_memory_get_dirty_flags(ram_addr_t addr)
+{
+    return phys_ram_dirty[addr >> TARGET_PAGE_BITS];
+}
+
 static inline int cpu_physical_memory_get_dirty(ram_addr_t addr,
                                                 int dirty_flags)
 {
@@ -890,9 +923,50 @@ static inline int cpu_physical_memory_get_dirty(ram_addr_t addr,
 
 static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
 {
+    if (phys_ram_dirty[addr >> TARGET_PAGE_BITS] != 0xff)
+        ++phys_ram_dirty_by_word[(addr >> TARGET_PAGE_BITS) / 
+                                 TARGET_LONG_BITS];
+
     phys_ram_dirty[addr >> TARGET_PAGE_BITS] = 0xff;
 }
 
+static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr,
+                                                      int dirty_flags)
+{
+    if ((phys_ram_dirty[addr >> TARGET_PAGE_BITS] != 0xff) &&
+        ((phys_ram_dirty[addr >> TARGET_PAGE_BITS] | dirty_flags) == 0xff)) 
+        ++phys_ram_dirty_by_word[(addr >> TARGET_PAGE_BITS) / 
+                                 TARGET_LONG_BITS];
+
+    return phys_ram_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags;
+}
+
+static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start,
+                                                        int length,
+                                                        int dirty_flags)
+{
+    int i, mask, len, *pw;
+    uint8_t *p;
+
+    len = length >> TARGET_PAGE_BITS;
+    mask = ~dirty_flags;
+    p = phys_ram_dirty + (start >> TARGET_PAGE_BITS);
+    pw = phys_ram_dirty_by_word + (start >> TARGET_PAGE_BITS) / 
+        TARGET_LONG_BITS;
+
+    for (i = 0; i < len; i++) {
+        if (p[i] == 0xff)
+            --pw[i / TARGET_LONG_BITS];
+        p[i] &= mask;
+    }
+}
+
+int cpu_physical_memory_get_dirty_range(ram_addr_t start, ram_addr_t end, 
+                                        int dirty_flags);
+
+int cpu_physical_memory_get_non_dirty_range(ram_addr_t start, ram_addr_t end, 
+                                            int dirty_flags);
+
 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
                                      int dirty_flags);
 void cpu_tlb_update_dirty(CPUState *env);
diff --git a/cpu-defs.h b/cpu-defs.h
index cf502e9..8e89e96 100644
--- a/cpu-defs.h
+++ b/cpu-defs.h
@@ -37,6 +37,7 @@
 #endif
 
 #define TARGET_LONG_SIZE (TARGET_LONG_BITS / 8)
+#define TARGET_LONG_ALIGN(addr) (((addr) + TARGET_LONG_BITS - 1) / TARGET_LONG_BITS) 
 
 /* target_ulong is the type of a virtual address */
 #if TARGET_LONG_SIZE == 4
-- 
1.6.3.3