memory: Add global-locking property to memory regions

This introduces the memory region property "global_locking". It is true
by default. By setting it to false, a device model can request BQL-free
dispatching of region accesses to its r/w handlers. The actual BQL
break-up will be provided in a separate patch.

Backports commit 196ea13104f802c508e57180b2a0d2b3418989a3 from qemu

qemu/aarch64.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_aarch64
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_aarch64
 #define memory_region_big_endian memory_region_big_endian_aarch64
+#define memory_region_clear_global_locking memory_region_clear_global_locking_aarch64
 #define memory_region_clear_pending memory_region_clear_pending_aarch64
 #define memory_region_del_subregion memory_region_del_subregion_aarch64
 #define memory_region_destructor_alias memory_region_destructor_alias_aarch64
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_aarch64
 #define memory_region_set_alias_offset memory_region_set_alias_offset_aarch64
 #define memory_region_set_enabled memory_region_set_enabled_aarch64
+#define memory_region_set_global_locking memory_region_set_global_locking_aarch64
 #define memory_region_set_readonly memory_region_set_readonly_aarch64
 #define memory_region_set_skip_dump memory_region_set_skip_dump_aarch64
 #define memory_region_size memory_region_size_aarch64

qemu/aarch64eb.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_aarch64eb
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_aarch64eb
 #define memory_region_big_endian memory_region_big_endian_aarch64eb
+#define memory_region_clear_global_locking memory_region_clear_global_locking_aarch64eb
 #define memory_region_clear_pending memory_region_clear_pending_aarch64eb
 #define memory_region_del_subregion memory_region_del_subregion_aarch64eb
 #define memory_region_destructor_alias memory_region_destructor_alias_aarch64eb
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_aarch64eb
 #define memory_region_set_alias_offset memory_region_set_alias_offset_aarch64eb
 #define memory_region_set_enabled memory_region_set_enabled_aarch64eb
+#define memory_region_set_global_locking memory_region_set_global_locking_aarch64eb
 #define memory_region_set_readonly memory_region_set_readonly_aarch64eb
 #define memory_region_set_skip_dump memory_region_set_skip_dump_aarch64eb
 #define memory_region_size memory_region_size_aarch64eb

qemu/arm.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_arm
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_arm
 #define memory_region_big_endian memory_region_big_endian_arm
+#define memory_region_clear_global_locking memory_region_clear_global_locking_arm
 #define memory_region_clear_pending memory_region_clear_pending_arm
 #define memory_region_del_subregion memory_region_del_subregion_arm
 #define memory_region_destructor_alias memory_region_destructor_alias_arm
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_arm
 #define memory_region_set_alias_offset memory_region_set_alias_offset_arm
 #define memory_region_set_enabled memory_region_set_enabled_arm
+#define memory_region_set_global_locking memory_region_set_global_locking_arm
 #define memory_region_set_readonly memory_region_set_readonly_arm
 #define memory_region_set_skip_dump memory_region_set_skip_dump_arm
 #define memory_region_size memory_region_size_arm

qemu/armeb.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_armeb
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_armeb
 #define memory_region_big_endian memory_region_big_endian_armeb
+#define memory_region_clear_global_locking memory_region_clear_global_locking_armeb
 #define memory_region_clear_pending memory_region_clear_pending_armeb
 #define memory_region_del_subregion memory_region_del_subregion_armeb
 #define memory_region_destructor_alias memory_region_destructor_alias_armeb
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_armeb
 #define memory_region_set_alias_offset memory_region_set_alias_offset_armeb
 #define memory_region_set_enabled memory_region_set_enabled_armeb
+#define memory_region_set_global_locking memory_region_set_global_locking_armeb
 #define memory_region_set_readonly memory_region_set_readonly_armeb
 #define memory_region_set_skip_dump memory_region_set_skip_dump_armeb
 #define memory_region_size memory_region_size_armeb

qemu/header_gen.py

@@ -2058,6 +2058,7 @@ symbols = (
     'memory_region_add_subregion_common',
     'memory_region_add_subregion_overlap',
     'memory_region_big_endian',
+    'memory_region_clear_global_locking',
     'memory_region_clear_pending',
     'memory_region_del_subregion',
     'memory_region_destructor_alias',
@@ -2110,6 +2111,7 @@ symbols = (
     'memory_region_set_address',
     'memory_region_set_alias_offset',
     'memory_region_set_enabled',
+    'memory_region_set_global_locking',
     'memory_region_set_readonly',
     'memory_region_set_skip_dump',
     'memory_region_size',

qemu/include/exec/memory.h

@@ -169,6 +169,7 @@ struct MemoryRegion {
     bool enabled;
     bool rom_device;
     bool warning_printed; /* For reservations */
+    bool global_locking;
     MemoryRegion *alias;
     hwaddr alias_offset;
     int32_t priority;
@@ -587,6 +588,31 @@ bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
  */
 void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
 
+/**
+ * memory_region_set_global_locking: Declares the access processing requires
+ *                                   QEMU's global lock.
+ *
+ * When this is invoked, accesses to the memory region will be processed while
+ * holding the global lock of QEMU. This is the default behavior of memory
+ * regions.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_set_global_locking(MemoryRegion *mr);
+
+/**
+ * memory_region_clear_global_locking: Declares that access processing does
+ *                                     not depend on the QEMU global lock.
+ *
+ * By clearing this property, accesses to the memory region will be processed
+ * outside of QEMU's global lock (unless the lock is held on when issuing the
+ * access request). In this case, the device model implementing the access
+ * handlers is responsible for synchronization of concurrency.
+ *
+ * @mr: the memory region to be updated.
+ */
+void memory_region_clear_global_locking(MemoryRegion *mr);
+
 /**
  * memory_region_rom_device_set_romd: enable/disable ROMD mode
  *

qemu/m68k.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_m68k
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_m68k
 #define memory_region_big_endian memory_region_big_endian_m68k
+#define memory_region_clear_global_locking memory_region_clear_global_locking_m68k
 #define memory_region_clear_pending memory_region_clear_pending_m68k
 #define memory_region_del_subregion memory_region_del_subregion_m68k
 #define memory_region_destructor_alias memory_region_destructor_alias_m68k
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_m68k
 #define memory_region_set_alias_offset memory_region_set_alias_offset_m68k
 #define memory_region_set_enabled memory_region_set_enabled_m68k
+#define memory_region_set_global_locking memory_region_set_global_locking_m68k
 #define memory_region_set_readonly memory_region_set_readonly_m68k
 #define memory_region_set_skip_dump memory_region_set_skip_dump_m68k
 #define memory_region_size memory_region_size_m68k

qemu/memory.c

@@ -953,6 +953,7 @@ static void memory_region_initfn(struct uc_struct *uc, Object *obj, void *opaque
     mr->ram_addr = RAM_ADDR_INVALID;
     mr->enabled = true;
     mr->romd_mode = true;
+    mr->global_locking = true;
     mr->destructor = memory_region_destructor_none;
     QTAILQ_INIT(&mr->subregions);
 
@@ -1313,6 +1314,16 @@ void memory_region_set_readonly(MemoryRegion *mr, bool readonly)
     }
 }
 
+void memory_region_set_global_locking(MemoryRegion *mr)
+{
+    mr->global_locking = true;
+}
+
+void memory_region_clear_global_locking(MemoryRegion *mr)
+{
+    mr->global_locking = false;
+}
+
 void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode)
 {
     if (mr->romd_mode != romd_mode) {

qemu/mips.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_mips
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_mips
 #define memory_region_big_endian memory_region_big_endian_mips
+#define memory_region_clear_global_locking memory_region_clear_global_locking_mips
 #define memory_region_clear_pending memory_region_clear_pending_mips
 #define memory_region_del_subregion memory_region_del_subregion_mips
 #define memory_region_destructor_alias memory_region_destructor_alias_mips
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_mips
 #define memory_region_set_alias_offset memory_region_set_alias_offset_mips
 #define memory_region_set_enabled memory_region_set_enabled_mips
+#define memory_region_set_global_locking memory_region_set_global_locking_mips
 #define memory_region_set_readonly memory_region_set_readonly_mips
 #define memory_region_set_skip_dump memory_region_set_skip_dump_mips
 #define memory_region_size memory_region_size_mips

qemu/mips64.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_mips64
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_mips64
 #define memory_region_big_endian memory_region_big_endian_mips64
+#define memory_region_clear_global_locking memory_region_clear_global_locking_mips64
 #define memory_region_clear_pending memory_region_clear_pending_mips64
 #define memory_region_del_subregion memory_region_del_subregion_mips64
 #define memory_region_destructor_alias memory_region_destructor_alias_mips64
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_mips64
 #define memory_region_set_alias_offset memory_region_set_alias_offset_mips64
 #define memory_region_set_enabled memory_region_set_enabled_mips64
+#define memory_region_set_global_locking memory_region_set_global_locking_mips64
 #define memory_region_set_readonly memory_region_set_readonly_mips64
 #define memory_region_set_skip_dump memory_region_set_skip_dump_mips64
 #define memory_region_size memory_region_size_mips64

qemu/mips64el.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_mips64el
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_mips64el
 #define memory_region_big_endian memory_region_big_endian_mips64el
+#define memory_region_clear_global_locking memory_region_clear_global_locking_mips64el
 #define memory_region_clear_pending memory_region_clear_pending_mips64el
 #define memory_region_del_subregion memory_region_del_subregion_mips64el
 #define memory_region_destructor_alias memory_region_destructor_alias_mips64el
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_mips64el
 #define memory_region_set_alias_offset memory_region_set_alias_offset_mips64el
 #define memory_region_set_enabled memory_region_set_enabled_mips64el
+#define memory_region_set_global_locking memory_region_set_global_locking_mips64el
 #define memory_region_set_readonly memory_region_set_readonly_mips64el
 #define memory_region_set_skip_dump memory_region_set_skip_dump_mips64el
 #define memory_region_size memory_region_size_mips64el

qemu/mipsel.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_mipsel
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_mipsel
 #define memory_region_big_endian memory_region_big_endian_mipsel
+#define memory_region_clear_global_locking memory_region_clear_global_locking_mipsel
 #define memory_region_clear_pending memory_region_clear_pending_mipsel
 #define memory_region_del_subregion memory_region_del_subregion_mipsel
 #define memory_region_destructor_alias memory_region_destructor_alias_mipsel
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_mipsel
 #define memory_region_set_alias_offset memory_region_set_alias_offset_mipsel
 #define memory_region_set_enabled memory_region_set_enabled_mipsel
+#define memory_region_set_global_locking memory_region_set_global_locking_mipsel
 #define memory_region_set_readonly memory_region_set_readonly_mipsel
 #define memory_region_set_skip_dump memory_region_set_skip_dump_mipsel
 #define memory_region_size memory_region_size_mipsel

qemu/powerpc.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_powerpc
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_powerpc
 #define memory_region_big_endian memory_region_big_endian_powerpc
+#define memory_region_clear_global_locking memory_region_clear_global_locking_powerpc
 #define memory_region_clear_pending memory_region_clear_pending_powerpc
 #define memory_region_del_subregion memory_region_del_subregion_powerpc
 #define memory_region_destructor_alias memory_region_destructor_alias_powerpc
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_powerpc
 #define memory_region_set_alias_offset memory_region_set_alias_offset_powerpc
 #define memory_region_set_enabled memory_region_set_enabled_powerpc
+#define memory_region_set_global_locking memory_region_set_global_locking_powerpc
 #define memory_region_set_readonly memory_region_set_readonly_powerpc
 #define memory_region_set_skip_dump memory_region_set_skip_dump_powerpc
 #define memory_region_size memory_region_size_powerpc

qemu/sparc.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_sparc
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_sparc
 #define memory_region_big_endian memory_region_big_endian_sparc
+#define memory_region_clear_global_locking memory_region_clear_global_locking_sparc
 #define memory_region_clear_pending memory_region_clear_pending_sparc
 #define memory_region_del_subregion memory_region_del_subregion_sparc
 #define memory_region_destructor_alias memory_region_destructor_alias_sparc
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_sparc
 #define memory_region_set_alias_offset memory_region_set_alias_offset_sparc
 #define memory_region_set_enabled memory_region_set_enabled_sparc
+#define memory_region_set_global_locking memory_region_set_global_locking_sparc
 #define memory_region_set_readonly memory_region_set_readonly_sparc
 #define memory_region_set_skip_dump memory_region_set_skip_dump_sparc
 #define memory_region_size memory_region_size_sparc

qemu/sparc64.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_sparc64
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_sparc64
 #define memory_region_big_endian memory_region_big_endian_sparc64
+#define memory_region_clear_global_locking memory_region_clear_global_locking_sparc64
 #define memory_region_clear_pending memory_region_clear_pending_sparc64
 #define memory_region_del_subregion memory_region_del_subregion_sparc64
 #define memory_region_destructor_alias memory_region_destructor_alias_sparc64
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_sparc64
 #define memory_region_set_alias_offset memory_region_set_alias_offset_sparc64
 #define memory_region_set_enabled memory_region_set_enabled_sparc64
+#define memory_region_set_global_locking memory_region_set_global_locking_sparc64
 #define memory_region_set_readonly memory_region_set_readonly_sparc64
 #define memory_region_set_skip_dump memory_region_set_skip_dump_sparc64
 #define memory_region_size memory_region_size_sparc64

qemu/x86_64.h

@@ -2052,6 +2052,7 @@
 #define memory_region_add_subregion_common memory_region_add_subregion_common_x86_64
 #define memory_region_add_subregion_overlap memory_region_add_subregion_overlap_x86_64
 #define memory_region_big_endian memory_region_big_endian_x86_64
+#define memory_region_clear_global_locking memory_region_clear_global_locking_x86_64
 #define memory_region_clear_pending memory_region_clear_pending_x86_64
 #define memory_region_del_subregion memory_region_del_subregion_x86_64
 #define memory_region_destructor_alias memory_region_destructor_alias_x86_64
@@ -2104,6 +2105,7 @@
 #define memory_region_set_address memory_region_set_address_x86_64
 #define memory_region_set_alias_offset memory_region_set_alias_offset_x86_64
 #define memory_region_set_enabled memory_region_set_enabled_x86_64
+#define memory_region_set_global_locking memory_region_set_global_locking_x86_64
 #define memory_region_set_readonly memory_region_set_readonly_x86_64
 #define memory_region_set_skip_dump memory_region_set_skip_dump_x86_64
 #define memory_region_size memory_region_size_x86_64