[Qemu-devel] [PATCH 1/6] savevm: Add VMSTATE_UINT64_EQUAL helpers

[David Gibson <david@gibson.dropbear.id.au>]

The savevm code already includes a number of *_EQUAL helpers which act as
sanity checks verifying that the configuration of the saved state matches
that of the machine we're loading into to work.  Variants already exist
for 8 bit 16 bit and 32 bit integers, but not 64 bit integers.  This patch
fills that hole, adding a UINT64 version.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 savevm.c  |   20 ++++++++++++++++++++
 vmstate.h |    7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/savevm.c b/savevm.c
index c7fe283..f38e16e 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1043,6 +1043,26 @@ const VMStateInfo vmstate_info_uint64 = {
     .put  = put_uint64,
 };
 
+/* 64 bit unsigned int. See that the received value is the same than the one
+   in the field */
+
+static int get_uint64_equal(QEMUFile *f, void *pv, size_t size)
+{
+    uint64_t *v = pv;
+    uint64_t v2;
+    qemu_get_be64s(f, &v2);
+
+    if (*v == v2)
+        return 0;
+    return -EINVAL;
+}
+
+const VMStateInfo vmstate_info_uint64_equal = {
+    .name = "int64 equal",
+    .get  = get_uint64_equal,
+    .put  = put_uint64,
+};
+
 /* 8 bit int. See that the received value is the same than the one
    in the field */
 
diff --git a/vmstate.h b/vmstate.h
index c9c320e..6c7fbe0 100644
--- a/vmstate.h
+++ b/vmstate.h
@@ -129,6 +129,7 @@ extern const VMStateInfo vmstate_info_uint8_equal;
 extern const VMStateInfo vmstate_info_uint16_equal;
 extern const VMStateInfo vmstate_info_int32_equal;
 extern const VMStateInfo vmstate_info_uint32_equal;
+extern const VMStateInfo vmstate_info_uint64_equal;
 extern const VMStateInfo vmstate_info_int32_le;
 
 extern const VMStateInfo vmstate_info_uint8;
@@ -488,6 +489,12 @@ extern const VMStateInfo vmstate_info_unused_buffer;
 #define VMSTATE_UINT32_EQUAL(_f, _s)                                   \
     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_uint32_equal, uint32_t)
 
+#define VMSTATE_UINT64_EQUAL_V(_f, _s, _v)                            \
+    VMSTATE_SINGLE(_f, _s, _v, vmstate_info_uint64_equal, uint64_t)
+
+#define VMSTATE_UINT64_EQUAL(_f, _s)                                  \
+    VMSTATE_UINT64_EQUAL_V(_f, _s, 0)
+
 #define VMSTATE_INT32_LE(_f, _s)                                   \
     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_int32_le, int32_t)
 
-- 
1.7.10.4