[Qemu-devel] [RFC PATCH RDMA support v1: 04/13] update QEMUFileOps with new hooks

[mrhines]

From: "Michael R. Hines" <address@hidden>

These are just the prototypes for optional new hooks that RDMA
takes advantage of to perform dynamic page registration.

An optional hook is also introduce for a custom function
to be able to override the default save_page function.

Signed-off-by: Michael R. Hines <address@hidden>
---
 include/migration/qemu-file.h |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
index 623c434..e2eca28 100644
--- a/include/migration/qemu-file.h
+++ b/include/migration/qemu-file.h
@@ -23,6 +23,7 @@
  */
 #ifndef QEMU_FILE_H
 #define QEMU_FILE_H 1
+#include "exec/cpu-common.h"
 
 /* This function writes a chunk of data to a file at the given position.
  * The pos argument can be ignored if the file is only being used for
@@ -57,12 +58,39 @@ typedef int (QEMUFileGetFD)(void *opaque);
 typedef ssize_t (QEMUFileWritevBufferFunc)(void *opaque, struct iovec *iov,
                                            int iovcnt);
 
+/*
+ * This function provides hooks around different
+ * stages of RAM migration.
+ */
+typedef int (QEMURamHookFunc)(QEMUFile *f, void *opaque, uint32_t flags);
+
+/*
+ * Constants used by QEMURamFunc.
+ */
+#define RAM_CONTROL_SETUP    0
+#define RAM_CONTROL_ROUND    1
+#define RAM_CONTROL_REGISTER 2
+#define RAM_CONTROL_FINISH   3
+
+/*
+ * This function allows override of where the RAM page
+ * is saved (such as RDMA, for example.)
+ */
+typedef size_t (QEMURamSaveFunc)(QEMUFile *f, void *opaque,
+                               ram_addr_t block_offset, 
+                               ram_addr_t offset,
+                               int cont, size_t size, bool zero);
+
 typedef struct QEMUFileOps {
     QEMUFilePutBufferFunc *put_buffer;
     QEMUFileGetBufferFunc *get_buffer;
     QEMUFileCloseFunc *close;
     QEMUFileGetFD *get_fd;
     QEMUFileWritevBufferFunc *writev_buffer;
+    QEMURamHookFunc *before_ram_iterate;
+    QEMURamHookFunc *after_ram_iterate;
+    QEMURamHookFunc *hook_ram_load;
+    QEMURamSaveFunc *save_page;
 } QEMUFileOps;
 
 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
@@ -81,6 +109,8 @@ void qemu_put_byte(QEMUFile *f, int v);
  */
 void qemu_put_buffer_async(QEMUFile *f, const uint8_t *buf, int size);
 
+bool qemu_file_mode_is_not_valid(const char * mode);
+
 static inline void qemu_put_ubyte(QEMUFile *f, unsigned int v)
 {
     qemu_put_byte(f, (int)v);
-- 
1.7.10.4