[Qemu-devel] [PATCH 13/35] vmstate: introduce VMSTATE_VARRAY_MULTIPLY

[Juan Quintela]

This allows to sent a partial array where the size is another
structure field multiplied by a constant.

Signed-off-by: Juan Quintela <address@hidden>
---
 savevm.c  |    6 ++++++
 vmstate.h |   35 +++++++++++++++++++++++------------
 2 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/savevm.c b/savevm.c
index 0a00dec..211be7b 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1509,6 +1509,9 @@ int vmstate_load_state(QEMUFile *f, const 
VMStateDescription *vmsd,
             } else if (field->flags & VMS_VARRAY_UINT8) {
                 n_elems = *(uint8_t *)(opaque+field->num_offset);
             }
+            if (field->flags & VMS_MULTIPLY_ELEMENTS) {
+                    n_elems *= field->num;
+            }
             if (field->flags & VMS_POINTER) {
                 base_addr = *(void **)base_addr + field->start;
             }
@@ -1573,6 +1576,9 @@ void vmstate_save_state(QEMUFile *f, const 
VMStateDescription *vmsd,
             } else if (field->flags & VMS_VARRAY_UINT8) {
                 n_elems = *(uint8_t *)(opaque+field->num_offset);
             }
+            if (field->flags & VMS_MULTIPLY_ELEMENTS) {
+                    n_elems *= field->num;
+            }
             if (field->flags & VMS_POINTER) {
                 base_addr = *(void **)base_addr + field->start;
             }
diff --git a/vmstate.h b/vmstate.h
index b8ac2d0..b0225e9 100644
--- a/vmstate.h
+++ b/vmstate.h
@@ -64,18 +64,19 @@ struct VMStateInfo {
 };

 enum VMStateFlags {
-    VMS_SINGLE           = 0x001,
-    VMS_POINTER          = 0x002,
-    VMS_ARRAY            = 0x004,
-    VMS_STRUCT           = 0x008,
-    VMS_VARRAY_INT32     = 0x010,  /* Array with size in int32_t field*/
-    VMS_BUFFER           = 0x020,  /* static sized buffer */
-    VMS_ARRAY_OF_POINTER = 0x040,
-    VMS_VARRAY_UINT16    = 0x080,  /* Array with size in uint16_t field */
-    VMS_VBUFFER          = 0x100,  /* Buffer with size in int32_t field */
-    VMS_MULTIPLY         = 0x200,  /* multiply "size" field by field_size */
-    VMS_VARRAY_UINT8     = 0x400,  /* Array with size in uint8_t field*/
-    VMS_VARRAY_UINT32    = 0x800,  /* Array with size in uint32_t field*/
+    VMS_SINGLE            = 0x001,
+    VMS_POINTER           = 0x002,
+    VMS_ARRAY             = 0x004,
+    VMS_STRUCT            = 0x008,
+    VMS_VARRAY_INT32      = 0x010,  /* Array with size in int32_t field*/
+    VMS_BUFFER            = 0x020,  /* static sized buffer */
+    VMS_ARRAY_OF_POINTER  = 0x040,
+    VMS_VARRAY_UINT16     = 0x080,  /* Array with size in uint16_t field */
+    VMS_VBUFFER           = 0x100,  /* Buffer with size in int32_t field */
+    VMS_MULTIPLY          = 0x200,  /* multiply "size" field by field_size */
+    VMS_VARRAY_UINT8      = 0x400,  /* Array with size in uint8_t field*/
+    VMS_VARRAY_UINT32     = 0x800,  /* Array with size in uint32_t field*/
+    VMS_MULTIPLY_ELEMENTS = 0x1000,  /* multiply "size" field by field_size */
 };

 typedef struct {
@@ -200,6 +201,16 @@ extern const VMStateDescription vmstate_cpu;
     .offset     = vmstate_offset_array(_state, _field, _type, _num), \
 }

+#define VMSTATE_VARRAY_MULTIPLY(_field, _state, _field_num, _multiply, _info, 
_type) { \
+    .name       = (stringify(_field)),                               \
+    .num_offset = vmstate_offset_value(_state, _field_num, uint32_t),\
+    .num        = (_multiply),                                       \
+    .info       = &(_info),                                          \
+    .size       = sizeof(_type),                                     \
+    .flags      = VMS_VARRAY_UINT32|VMS_MULTIPLY_ELEMENTS,           \
+    .offset     = offsetof(_state, _field),                          \
+}
+
 #define VMSTATE_ARRAY_TEST(_field, _state, _num, _test, _info, _type) {\
     .name         = (stringify(_field)),                              \
     .field_exists = (_test),                                          \
-- 
1.7.7.6