Respect HW configs when loading VM from snapshots.

Changing HW configuration properties may cause emulator / guest system crash on
condition that VM has been loaded from a snapshot. This CL addresses this issue
in the following way:

1. Each time a snapshot is saved, a backup copy of HW config is saved with it.
2. Each time a snapshot is loaded, emulator finds an appropriate HW config
   backup, and compares current HW config with the one that was saved in the
   backup, and if configs are different, emulator exits with an appropriate
   error.

Change-Id: I730bec0afbe166e88189fdcc4804b76e109e4422

1 files changed, 32 insertions, 0 deletions

diff --git a/android/snaphost-android.h b/android/snaphost-android.h
new file mode 100644
index 0000000..ae558ba
--- /dev/null
+++ b/android/snaphost-android.h
@@ -0,0 +1,32 @@
+/* Copyright (C) 2012 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+*/
+
+#ifndef _ANDROID_SNAPHOST_ANDROID_H_
+#define _ANDROID_SNAPHOST_ANDROID_H_
+
+/* Matches HW config saved for a VM snapshot against the current HW config.
+ * Param:
+ *  hw_ini - IniFile instance containing the current HW config settings.
+ *  name - Name of the snapshot for which the VM is loading.
+ * Return:
+ *  Boolean: 1 if HW configurations match, or 0 if they don't match.
+ */
+extern int snaphost_match_configs(IniFile* hw_ini, const char* name);
+
+/* Saves HW config settings for the current VM.
+ * Param:
+ *  name - Name of the snapshot for the current VM.
+ */
+extern void snaphost_save_config(const char* name);
+
+#endif  /* _ANDROID_SNAPHOST_ANDROID_H_ */
+