Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/VBox/Devices/Trace/README.txt b/src/VBox/Devices/Trace/README.txt
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+/* $Id: README.txt $ */
+Introduction:
+
+    This is a simple tracing driver which hooks into a driver chain and logs all executed callbacks for a particular interface
+    with their parameters.
+    It uses the RTTraceLog API to write the data into a compact binary log file which can be examined using RTTraceLogTool
+    (which is still very basic at this point but will be enhanced when certain features are required).
+
+    Currently implemented interfaces are (implement more on a need basis and add them here):
+        - PDMISERIALPORT and PDMISERIALCONNECTOR
+
+Benefits:
+
+    This driver allows to gather more detailed information about the interaction between devices and attached drivers without
+    the need to add additional debug/logging code. This is especially useful for debugging user reported issues as it can avoid
+    having to send a special testbuil to the user (provided the interfaces are implemented by the trace driver),
+    the user just requires instructions on how to enable the tracing for her particular setup.
+
+    Later on this might also come in handy for a driver testbench because it allows recording the interaction from a complicated setup and
+    allows replaying it in a more controlled/compact environment for unit testing or fuzzing.
+
+Setup:
+
+    To inject the driver into an existing driver chain the PDM driver transformations feature is used.
+    The following example injects the trace driver right before every instance of the "Host Serial" driver:
+
+        VBoxManage setextradata <VM name> "VBoxInternal/PDM/DriverTransformations/SerialTrace/AboveDriver"                         "Host Serial"
+        VBoxManage setextradata <VM name> "VBoxInternal/PDM/DriverTransformations/SerialTrace/AttachedDriver/Config/TraceFilePath" "<trace/log/file/path>"
+        VBoxManage setextradata <VM name> "VBoxInternal/PDM/DriverTransformations/SerialTrace/AttachedDriver/Driver"               "IfTrace"/>
+
+
+