[Qemu-devel] [PATCH v2 1/9] introduce VMSTATE_U64

[Glauber Costa <glommer@redhat.com>]

Slightly modified version of a patch already included in qemu-kvm:

This is a patch actually written by Juan, which, according to him,
he plans on posting to qemu.git. Problem is that linux defines
u64 in a way that is type-uncompatible with uint64_t.

I am including it here, because it is a dependency to my patch series
that follows.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 hw/hw.h  |   24 ++++++++++++++++++++++++
 savevm.c |   23 +++++++++++++++++++++++
 2 files changed, 47 insertions(+), 0 deletions(-)

diff --git a/hw/hw.h b/hw/hw.h
index 1d4af2a..817b2c5 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -332,6 +332,11 @@ extern const VMStateInfo vmstate_info_uint16;
 extern const VMStateInfo vmstate_info_uint32;
 extern const VMStateInfo vmstate_info_uint64;
 
+#ifdef __linux__
+#include <linux/types.h>
+extern const VMStateInfo vmstate_info_u64;
+#endif
+
 extern const VMStateInfo vmstate_info_timer;
 extern const VMStateInfo vmstate_info_ptimer;
 extern const VMStateInfo vmstate_info_buffer;
@@ -388,6 +393,16 @@ extern const VMStateInfo vmstate_info_unused_buffer;
     .offset     = vmstate_offset_array(_state, _field, _type, _num), \
 }
 
+#define VMSTATE_ARRAY_UNSAFE(_field, _state, _num, _version, _info, _type) {\
+    .name       = (stringify(_field)),                               \
+    .version_id = (_version),                                        \
+    .num        = (_num),                                            \
+    .info       = &(_info),                                          \
+    .size       = sizeof(_type),                                     \
+    .flags      = VMS_ARRAY,                                         \
+    .offset     = offsetof(_state, _field)                           \
+}
+
 #define VMSTATE_ARRAY_TEST(_field, _state, _num, _test, _info, _type) {\
     .name         = (stringify(_field)),                              \
     .field_exists = (_test),                                          \
@@ -591,6 +606,15 @@ extern const VMStateDescription vmstate_i2c_slave;
 #define VMSTATE_UINT64(_f, _s)                                        \
     VMSTATE_UINT64_V(_f, _s, 0)
 
+/* This is needed because on linux __u64 is unsigned long long
+   and on glibc uint64_t is unsigned long on 64 bits */
+#ifdef __linux__
+#define VMSTATE_U64_V(_f, _s, _v)                                     \
+    VMSTATE_SINGLE(_f, _s, _v, vmstate_info_u64, __u64)
+#define VMSTATE_U64(_f, _s)                                           \
+    VMSTATE_U64_V(_f, _s, 0)
+#endif
+
 #define VMSTATE_UINT8_EQUAL(_f, _s)                                   \
     VMSTATE_SINGLE(_f, _s, 0, vmstate_info_uint8_equal, uint8_t)
 
diff --git a/savevm.c b/savevm.c
index 74f2c66..ac31eb7 100644
--- a/savevm.c
+++ b/savevm.c
@@ -856,6 +856,29 @@ const VMStateInfo vmstate_info_uint64 = {
     .put  = put_uint64,
 };
 
+/* 64 bit linux kernel unsigned int */
+
+#ifdef __linux__
+static int get_u64(QEMUFile *f, void *pv, size_t size)
+{
+    __u64 *v = pv;
+    qemu_get_be64s(f, (uint64_t *)v);
+    return 0;
+}
+
+static void put_u64(QEMUFile *f, void *pv, size_t size)
+{
+    __u64 *v = pv;
+    qemu_put_be64s(f, (uint64_t *)v);
+}
+
+const VMStateInfo vmstate_info_u64 = {
+    .name = "__u64",
+    .get  = get_u64,
+    .put  = put_u64,
+};
+#endif /* __linux__ */
+
 /* 8 bit int. See that the received value is the same than the one
    in the field */
 
-- 
1.6.2.5