migration: Add support for a variable-length array of UINT32 pointers

Add support for defining a vmstate field which is a variable-length array
of pointers, and use this to define a VMSTATE_TIMER_PTR_VARRAY() which allows
a variable-length array of QEMUTimer* to be used by devices.

Message-id: 20250909-timers-v1-0-7ee18a9d8f4b@linux.alibaba.com
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: TANG Tiancheng <lyndra@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20250911-timers-v3-2-60508f640050@linux.alibaba.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 1ff7bd9ac425ba67cd5ca7ad97bcf570f9e19abe..1cfddf31b54090f0f63380794092858b4bed8bcf 100644 (file)
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -522,6 +522,16 @@ extern const VMStateInfo vmstate_info_qlist;
     .offset     = vmstate_offset_array(_s, _f, _type*, _n),          \
 }
 
+#define VMSTATE_VARRAY_OF_POINTER_UINT32(_field, _state, _field_num, _version, _info, _type) { \
+    .name       = (stringify(_field)),                                    \
+    .version_id = (_version),                                             \
+    .num_offset = vmstate_offset_value(_state, _field_num, uint32_t),     \
+    .info       = &(_info),                                               \
+    .size       = sizeof(_type),                                          \
+    .flags      = VMS_VARRAY_UINT32 | VMS_ARRAY_OF_POINTER | VMS_POINTER, \
+    .offset     = vmstate_offset_pointer(_state, _field, _type),          \
+}
+
 #define VMSTATE_STRUCT_SUB_ARRAY(_field, _state, _start, _num, _version, _vmsd, _type) { \
     .name       = (stringify(_field)),                                     \
     .version_id = (_version),                                              \