[Qemu-devel] [PATCH 19/23] Add VMState support for int32_t check value

[Juan Quintela]

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 <address@hidden>
---
 hw/hw.h  |    4 ++++
 savevm.c |   20 ++++++++++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/hw/hw.h b/hw/hw.h
index 4713967..c574b47 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -314,6 +314,7 @@ 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;
@@ -446,6 +447,9 @@ 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 1b448b9..4879cf6 100644
--- a/savevm.c
+++ b/savevm.c
@@ -693,6 +693,26 @@ 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)
-- 
1.6.2.5