[RFC PATCH 10/20] Introduce skip_header parameter to qemu_loadvm_state() so that it can be called iteratively without reading the header.

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>
---
 migration-exec.c |    2 +-
 migration-fd.c   |    2 +-
 migration-tcp.c  |    2 +-
 migration-unix.c |    2 +-
 savevm.c         |   25 ++++++++++++++-----------
 sysemu.h         |    2 +-
 6 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/migration-exec.c b/migration-exec.c
index 3edc026..5839a6d 100644
--- a/migration-exec.c
+++ b/migration-exec.c
@@ -113,7 +113,7 @@ static void exec_accept_incoming_migration(void *opaque)
     QEMUFile *f = opaque;
     int ret;
 
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
     if (ret < 0) {
         fprintf(stderr, "load of migration failed\n");
         goto err;
diff --git a/migration-fd.c b/migration-fd.c
index 0cc74ad..0e97ed0 100644
--- a/migration-fd.c
+++ b/migration-fd.c
@@ -106,7 +106,7 @@ static void fd_accept_incoming_migration(void *opaque)
     QEMUFile *f = opaque;
     int ret;
 
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
     if (ret < 0) {
         fprintf(stderr, "load of migration failed\n");
         goto err;
diff --git a/migration-tcp.c b/migration-tcp.c
index 56e1a3b..94a1a03 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -182,7 +182,7 @@ static void tcp_accept_incoming_migration(void *opaque)
         goto out;
     }
 
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
     if (ret < 0) {
         fprintf(stderr, "load of migration failed\n");
         goto out_fopen;
diff --git a/migration-unix.c b/migration-unix.c
index b7aab38..dd99a73 100644
--- a/migration-unix.c
+++ b/migration-unix.c
@@ -168,7 +168,7 @@ static void unix_accept_incoming_migration(void *opaque)
         goto out;
     }
 
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
     if (ret < 0) {
         fprintf(stderr, "load of migration failed\n");
         goto out_fopen;
diff --git a/savevm.c b/savevm.c
index 22d928c..a401b27 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1554,7 +1554,7 @@ typedef struct LoadStateEntry {
     int version_id;
 } LoadStateEntry;
 
-int qemu_loadvm_state(QEMUFile *f)
+int qemu_loadvm_state(QEMUFile *f, int skip_header)
 {
     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
         QLIST_HEAD_INITIALIZER(loadvm_handlers);
@@ -1563,17 +1563,20 @@ int qemu_loadvm_state(QEMUFile *f)
     unsigned int v;
     int ret;
 
-    v = qemu_get_be32(f);
-    if (v != QEMU_VM_FILE_MAGIC)
-        return -EINVAL;
+    if (!skip_header) {
+        v = qemu_get_be32(f);
+        if (v != QEMU_VM_FILE_MAGIC)
+            return -EINVAL;
+
+        v = qemu_get_be32(f);
+        if (v == QEMU_VM_FILE_VERSION_COMPAT) {
+            fprintf(stderr, "SaveVM v3 format is obsolete and don't work anymore\n");
+            return -ENOTSUP;
+        }
+        if (v != QEMU_VM_FILE_VERSION)
+            return -ENOTSUP;
 
-    v = qemu_get_be32(f);
-    if (v == QEMU_VM_FILE_VERSION_COMPAT) {
-        fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
-        return -ENOTSUP;
     }
-    if (v != QEMU_VM_FILE_VERSION)
-        return -ENOTSUP;
 
     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
         uint32_t instance_id, version_id, section_id;
@@ -1898,7 +1901,7 @@ int load_vmstate(Monitor *mon, const char *name)
         monitor_printf(mon, "Could not open VM state file\n");
         return -EINVAL;
     }
-    ret = qemu_loadvm_state(f);
+    ret = qemu_loadvm_state(f, 0);
     qemu_fclose(f);
     if (ret < 0) {
         monitor_printf(mon, "Error %d while loading VM state\n", ret);
diff --git a/sysemu.h b/sysemu.h
index 647a468..6c1441f 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -68,7 +68,7 @@ int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f);
 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f);
 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f);
-int qemu_loadvm_state(QEMUFile *f);
+int qemu_loadvm_state(QEMUFile *f, int skip_header);
 
 void qemu_errors_to_file(FILE *fp);
 void qemu_errors_to_mon(Monitor *mon);
-- 
1.7.0.31.g1df487

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