[Qemu-devel] [PATCH 23/49] memory: cpu_physical_memory_mask_dirty_range() always clears a single flag

[Juan Quintela <quintela@redhat.com>]

Document it

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
---
 cputlb.c                       |  4 ++--
 exec.c                         | 19 ++++++++++---------
 include/exec/memory-internal.h | 40 ++++++++++++++++++----------------------
 include/exec/memory.h          |  3 ---
 memory.c                       | 10 ++++------
 5 files changed, 34 insertions(+), 42 deletions(-)

diff --git a/cputlb.c b/cputlb.c
index c545e4c..ec21405 100644
--- a/cputlb.c
+++ b/cputlb.c
@@ -114,7 +114,7 @@ void tlb_protect_code(ram_addr_t ram_addr)
 {
     cpu_physical_memory_reset_dirty(ram_addr,
                                     ram_addr + TARGET_PAGE_SIZE,
-                                    CODE_DIRTY_FLAG);
+                                    DIRTY_MEMORY_CODE);
 }

 /* update the TLB so that writes in physical page 'phys_addr' are no longer
@@ -122,7 +122,7 @@ void tlb_protect_code(ram_addr_t ram_addr)
 void tlb_unprotect_code_phys(CPUArchState *env, ram_addr_t ram_addr,
                              target_ulong vaddr)
 {
-    cpu_physical_memory_set_dirty_flag(ram_addr, CODE_DIRTY_FLAG);
+    cpu_physical_memory_set_dirty_flag(ram_addr, DIRTY_MEMORY_CODE);
 }

 static bool tlb_is_dirty_ram(CPUTLBEntry *tlbe)
diff --git a/exec.c b/exec.c
index f215960..82aca4a 100644
--- a/exec.c
+++ b/exec.c
@@ -738,7 +738,7 @@ static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t end,

 /* Note: start and end must be within the same ram block.  */
 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
-                                     int dirty_flags)
+                                     unsigned client)
 {
     uintptr_t length;

@@ -748,7 +748,7 @@ void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
     length = end - start;
     if (length == 0)
         return;
-    cpu_physical_memory_mask_dirty_range(start, length, dirty_flags);
+    cpu_physical_memory_mask_dirty_range(start, length, client);

     if (tcg_enabled()) {
         tlb_reset_dirty_range_all(start, end, length);
@@ -1485,7 +1485,7 @@ found:
 static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
                                uint64_t val, unsigned size)
 {
-    if (!cpu_physical_memory_get_dirty_flag(ram_addr, CODE_DIRTY_FLAG)) {
+    if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
         tb_invalidate_phys_page_fast(ram_addr, size);
     }
     switch (size) {
@@ -1501,8 +1501,8 @@ static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
     default:
         abort();
     }
-    cpu_physical_memory_set_dirty_flag(ram_addr, MIGRATION_DIRTY_FLAG);
-    cpu_physical_memory_set_dirty_flag(ram_addr, VGA_DIRTY_FLAG);
+    cpu_physical_memory_set_dirty_flag(ram_addr, DIRTY_MEMORY_MIGRATION);
+    cpu_physical_memory_set_dirty_flag(ram_addr, DIRTY_MEMORY_VGA);
     /* we remove the notdirty callback only if the code has been
        flushed */
     if (cpu_physical_memory_is_dirty(ram_addr)) {
@@ -1912,8 +1912,8 @@ static void invalidate_and_set_dirty(hwaddr addr,
         /* invalidate code */
         tb_invalidate_phys_page_range(addr, addr + length, 0);
         /* set dirty bit */
-        cpu_physical_memory_set_dirty_flag(addr, VGA_DIRTY_FLAG);
-        cpu_physical_memory_set_dirty_flag(addr, MIGRATION_DIRTY_FLAG);
+        cpu_physical_memory_set_dirty_flag(addr, DIRTY_MEMORY_VGA);
+        cpu_physical_memory_set_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
     }
     xen_modified_memory(addr, length);
 }
@@ -2528,8 +2528,9 @@ void stl_phys_notdirty(hwaddr addr, uint32_t val)
                 /* invalidate code */
                 tb_invalidate_phys_page_range(addr1, addr1 + 4, 0);
                 /* set dirty bit */
-                cpu_physical_memory_set_dirty_flag(addr1, MIGRATION_DIRTY_FLAG);
-                cpu_physical_memory_set_dirty_flag(addr1, VGA_DIRTY_FLAG);
+                cpu_physical_memory_set_dirty_flag(addr1,
+                                                   DIRTY_MEMORY_MIGRATION);
+                cpu_physical_memory_set_dirty_flag(addr1, DIRTY_MEMORY_VGA);
             }
         }
     }
diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 681d63b..b58010f 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -40,29 +40,25 @@ void *qemu_get_ram_ptr(ram_addr_t addr);
 void qemu_ram_free(ram_addr_t addr);
 void qemu_ram_free_from_ptr(ram_addr_t addr);

-#define VGA_DIRTY_FLAG       0x01
-#define CODE_DIRTY_FLAG      0x02
-#define MIGRATION_DIRTY_FLAG 0x08
-
 static inline bool cpu_physical_memory_get_dirty_flag(ram_addr_t addr,
-                                                      int dirty_flag)
+                                                      unsigned client)
 {
-    return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] & dirty_flag;
+    return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] & (1 << client);
 }

 /* read dirty bit (return 0 or 1) */
 static inline bool cpu_physical_memory_is_dirty(ram_addr_t addr)
 {
-    bool vga = cpu_physical_memory_get_dirty_flag(addr, VGA_DIRTY_FLAG);
-    bool code = cpu_physical_memory_get_dirty_flag(addr, CODE_DIRTY_FLAG);
+    bool vga = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_VGA);
+    bool code = cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_CODE);
     bool migration =
-        cpu_physical_memory_get_dirty_flag(addr, MIGRATION_DIRTY_FLAG);
+        cpu_physical_memory_get_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
     return vga && code && migration;
 }

 static inline int cpu_physical_memory_get_dirty(ram_addr_t start,
                                                 ram_addr_t length,
-                                                int dirty_flag)
+                                                unsigned client)
 {
     int ret = 0;
     ram_addr_t addr, end;
@@ -70,28 +66,28 @@ static inline int cpu_physical_memory_get_dirty(ram_addr_t start,
     end = TARGET_PAGE_ALIGN(start + length);
     start &= TARGET_PAGE_MASK;
     for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
-        ret |= cpu_physical_memory_get_dirty_flag(addr, dirty_flag);
+        ret |= cpu_physical_memory_get_dirty_flag(addr, client);
     }
     return ret;
 }

 static inline void cpu_physical_memory_set_dirty_flag(ram_addr_t addr,
-                                                      int dirty_flag)
+                                                      unsigned client)
 {
-    ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flag;
+    ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= (1 << client);
 }

 static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
 {
-    cpu_physical_memory_set_dirty_flag(addr, MIGRATION_DIRTY_FLAG);
-    cpu_physical_memory_set_dirty_flag(addr, VGA_DIRTY_FLAG);
-    cpu_physical_memory_set_dirty_flag(addr, CODE_DIRTY_FLAG);
+    cpu_physical_memory_set_dirty_flag(addr, DIRTY_MEMORY_MIGRATION);
+    cpu_physical_memory_set_dirty_flag(addr, DIRTY_MEMORY_VGA);
+    cpu_physical_memory_set_dirty_flag(addr, DIRTY_MEMORY_CODE);
 }

-static inline int cpu_physical_memory_clear_dirty_flags(ram_addr_t addr,
-                                                        int dirty_flags)
+static inline int cpu_physical_memory_clear_dirty_flag(ram_addr_t addr,
+                                                       unsigned client)
 {
-    int mask = ~dirty_flags;
+    int mask = ~(1 << client);

     return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
 }
@@ -111,19 +107,19 @@ static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,

 static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start,
                                                         ram_addr_t length,
-                                                        int dirty_flags)
+                                                        unsigned client)
 {
     ram_addr_t addr, end;

     end = TARGET_PAGE_ALIGN(start + length);
     start &= TARGET_PAGE_MASK;
     for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
-        cpu_physical_memory_clear_dirty_flags(addr, dirty_flags);
+        cpu_physical_memory_clear_dirty_flag(addr, client);
     }
 }

 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
-                                     int dirty_flags);
+                                     unsigned client);

 #endif

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 480dfbf..b8e76f4 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -33,9 +33,6 @@
 typedef struct MemoryRegionOps MemoryRegionOps;
 typedef struct MemoryRegionMmio MemoryRegionMmio;

-/* Must match *_DIRTY_FLAGS in cpu-all.h.  To be replaced with dynamic
- * registration.
- */
 #define DIRTY_MEMORY_VGA       0
 #define DIRTY_MEMORY_CODE      1
 #define DIRTY_MEMORY_MIGRATION 3
diff --git a/memory.c b/memory.c
index fb52e1c..a490cbd 100644
--- a/memory.c
+++ b/memory.c
@@ -1174,8 +1174,7 @@ bool memory_region_get_dirty(MemoryRegion *mr, hwaddr addr,
                              hwaddr size, unsigned client)
 {
     assert(mr->terminates);
-    return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
-                                         1 << client);
+    return cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
 }

 void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
@@ -1190,12 +1189,11 @@ bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
 {
     bool ret;
     assert(mr->terminates);
-    ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
-                                        1 << client);
+    ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size, client);
     if (ret) {
         cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
                                         mr->ram_addr + addr + size,
-                                        1 << client);
+                                        client);
     }
     return ret;
 }
@@ -1243,7 +1241,7 @@ void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
     assert(mr->terminates);
     cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
                                     mr->ram_addr + addr + size,
-                                    1 << client);
+                                    client);
 }

 void *memory_region_get_ram_ptr(MemoryRegion *mr)
-- 
1.8.4.2