diff mbox

[1/4] migration: Add VMSTATE_UNUSED_VARRAY_UINT32

Message ID 20170203160651.19917-2-dgilbert@redhat.com
State New
Headers show

Commit Message

Dr. David Alan Gilbert Feb. 3, 2017, 4:06 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

VMSTATE_UNUSED_VARRAY_UINT32 is used to skip a chunk of the stream
that's an n-element array;  note the array size and the dynamic value
read never get multiplied so there's no overflow risk.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 include/migration/vmstate.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Juan Quintela Feb. 13, 2017, 12:31 p.m. UTC | #1 
"Dr. David Alan Gilbert (git)" <dgilbert@redhat.com> wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
>
> VMSTATE_UNUSED_VARRAY_UINT32 is used to skip a chunk of the stream
> that's an n-element array;  note the array size and the dynamic value
> read never get multiplied so there's no overflow risk.
>
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>
diff mbox

Patch

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 6233fe2..cc66910 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -660,6 +660,17 @@  extern const VMStateInfo vmstate_info_qtailq;
     .flags        = VMS_BUFFER,                                      \
 }
 
+/* Discard size * field_num bytes, where field_num is a uint32 member */
+#define VMSTATE_UNUSED_VARRAY_UINT32(_state, _test, _version, _field_num, _size) {\
+    .name         = "unused",                                        \
+    .field_exists = (_test),                                         \
+    .num_offset   = vmstate_offset_value(_state, _field_num, uint32_t),\
+    .version_id   = (_version),                                      \
+    .size         = (_size),                                         \
+    .info         = &vmstate_info_unused_buffer,                     \
+    .flags        = VMS_VARRAY_UINT32 | VMS_BUFFER,                  \
+}
+
 /* _field_size should be a int32_t field in the _state struct giving the
  * size of the bitmap _field in bits.
  */