Add VMState support for int32_t check value

We read the saved value and check that it is less or equal than the one
stored in the structure.

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

2 files changed, 24 insertions, 0 deletions

diff --git a/hw/hw.h b/hw/hw.h
index 02392cacf8..f7b0a14793 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -315,6 +315,7 @@ extern const VMStateInfo vmstate_info_int32;
 extern const VMStateInfo vmstate_info_int64;
 
 extern const VMStateInfo vmstate_info_int32_equal;
+extern const VMStateInfo vmstate_info_int32_le;
 
 extern const VMStateInfo vmstate_info_uint8;
 extern const VMStateInfo vmstate_info_uint16;
@@ -447,6 +448,9 @@ extern const VMStateInfo vmstate_info_buffer;
 #define VMSTATE_INT32_EQUAL(_f, _s)                                   \
     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_equal, int32_t)
 
+#define VMSTATE_INT32_LE(_f, _s)                                   \
+    VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_le, int32_t)
+
 #define VMSTATE_TIMER_V(_f, _s, _v)                                   \
     VMSTATE_POINTER(_f, _s, _v, vmstate_info_timer, QEMUTimer *)
 
diff --git a/savevm.c b/savevm.c
index 68fe924d43..d953c4af79 100644
--- a/savevm.c
+++ b/savevm.c
@@ -722,6 +722,26 @@ const VMStateInfo vmstate_info_int32_equal = {
     .put  = put_int32,
 };
 
+/* 32 bit int. See that the received value is the less or the same
+   than the one in the field */
+
+static int get_int32_le(QEMUFile *f, void *pv, size_t size)
+{
+    int32_t *old = pv;
+    int32_t new;
+    qemu_get_sbe32s(f, &new);
+
+    if (*old <= new)
+        return 0;
+    return -EINVAL;
+}
+
+const VMStateInfo vmstate_info_int32_le = {
+    .name = "int32 equal",
+    .get  = get_int32_le,
+    .put  = put_int32,
+};
+
 /* 64 bit int */
 
 static int get_int64(QEMUFile *f, void *pv, size_t size)