[vbox-dev] LogFlow() statements...

Sandeep Koppala skoppala at cs.stonybrook.edu
Thu Dec 13 23:38:31 GMT 2012

Hi Ram,

Thanks for the reply.

We went ahead and modified the code in VBoxServicePageSharing.cpp. We basically added a function VBoxServicePageSharingInspectG
uest( ) that compiles for linux platform. In this functions, we are trying to register modules from the linux guest using information obtained from /proc/modules; we are calling the function VbglR3RegisterSharedModule( ) for the same. < The very function that is used by the code for windows > We are also invoking VbglR3CheckSharedModules( ) after registering, as is being done in case of windows.

We have not been able to get any successful results so far (as reported by the VBoxManage metrics). A couple of concerns are:
1. Parameters for VbglR3RegisterSharedModule( ):
   a. Name of the module
   b. Version of the module
   c. Base address of the module (Virtual Address)
   d. Base size of the module
   e. No. of regions (elements in VMMDEVSHAREDREGIONDESC array)
   f. An array describing various memory regions in the module (VMMDEVSHAREDREGIONDESC array)

- Is our understanding correct ? Or is there anything wrong ?

2. We are trying to pass each module from /proc/modules in the Linux guest as ONE single region. The name, base address and size are available from /proc/modules. We are passing a dummy value for the version, and filling the array with one entry - address and size.

Your comments on the same. Any insights will be helpful, as we are pretty much stuck. Sorry for this verbose email.

From: Ramshankar [ramshankar.venkataraman at oracle.com]
Sent: Monday, December 10, 2012 5:45 AM
To: Sandeep Koppala
Cc: vbox-dev at virtualbox.org
Subject: Re: [vbox-dev] LogFlow() statements...

On 12/07/2012 04:32 AM, Sandeep Koppala wrote:
Hi all,

I am trying to implement Page Fusion for x64 Linux guests. I understand that this will require changes to the Guest Additions. Specifically, in the VBoxServicePageSharing.cpp code. I have made some changes here and I am trying to call VbglR3RegisterSharedModule function with information about Linux guest modules.

1. I am unable to put a trace in the R3 code, the code for the VMM / hypervisor. I am unable to see the LogFlow() messages. Can you help me enable it ?

2. Is the code that implements page-fusing / sharing in the VMM specific to windows ?

Thanks in advance !

vbox-dev mailing list
vbox-dev at virtualbox.org<mailto:vbox-dev at virtualbox.org>

1. Did you take a look at logging information here: https://www.virtualbox.org/wiki/VBoxLogging (see Ring-0 logging)?

2. From a quick glance, the guest additions part of the code is specific to Windows, on the host side it is platform agnostic (not enabled for 64-bit darwin hosts though). The guest addition side has some compile-time defines that only register the service hooks for Windows (VBoxService.cpp).


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