vmstate: add support for uint8_t equal

Signed-off-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/hw.h

@@ -318,6 +318,7 @@ extern const VMStateInfo vmstate_info_int16;
 extern const VMStateInfo vmstate_info_int32;
 extern const VMStateInfo vmstate_info_int64;
 
+extern const VMStateInfo vmstate_info_uint8_equal;
 extern const VMStateInfo vmstate_info_int32_equal;
 extern const VMStateInfo vmstate_info_int32_le;
 
@@ -461,6 +462,9 @@ extern const VMStateDescription vmstate_pci_device;
 #define VMSTATE_UINT64(_f, _s)                                        \
     VMSTATE_UINT64_V(_f, _s, 0)
 
+#define VMSTATE_UINT8_EQUAL(_f, _s)                                   \
+    VMSTATE_SINGLE(_f, _s, 0, vmstate_info_uint8_equal, uint8_t)
+
 #define VMSTATE_INT32_EQUAL(_f, _s)                                   \
     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_equal, int32_t)
 

savevm.c

@@ -847,6 +847,26 @@ const VMStateInfo vmstate_info_uint64 = {
     .put  = put_uint64,
 };
 
+/* 8 bit int. See that the received value is the same than the one
+   in the field */
+
+static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
+{
+    uint8_t *v = pv;
+    uint8_t v2;
+    qemu_get_8s(f, &v2);
+
+    if (*v == v2)
+        return 0;
+    return -EINVAL;
+}
+
+const VMStateInfo vmstate_info_uint8_equal = {
+    .name = "int32 equal",
+    .get  = get_uint8_equal,
+    .put  = put_uint8,
+};
+
 /* timers  */
 
 static int get_timer(QEMUFile *f, void *pv, size_t size)