[vbox-dev] Problems with porting a VritualBox frontend from Windows to Linux

[Rūdolfs Bundulis]

Hi,

I'm porting my existing frontend from Windows (COM) to Linux (XPCOM). I was
able to successfully plug all the XPCOM stuff from the example in the
source tree. I am able to successfully obtain an instance of the API, find
the needed machine and power it up. However after I call IConsole PowerUp I
get an error which I didn't get on Windows in the VBox.log:

irtualBox VM 4.3.10_Ubuntu r93012 linux.amd64 (Jan 29 2015 03:52:40)
release log
00:00:02.502397 Log opened 2015-03-15T13:13:26.762531000Z
00:00:02.502398 Build Type: release
00:00:02.502402 OS Product: Linux
00:00:02.502402 OS Release: 3.16.0-30-generic
00:00:02.502403 OS Version: #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC
2015
00:00:02.502424 DMI Product Name: Z9PE-D16 Series
00:00:02.502430 DMI Product Version: 1.0X
00:00:02.502501 Host RAM: 15995MB total, 15603MB available
00:00:02.502531 Executable:
/tmp/DisplayWall/Build/Linux/Debug/DisplayWallServer
00:00:02.502532 Process ID: 16081
00:00:02.502533 Package type: LINUX_64BITS_GENERIC (OSE)
00:00:02.508922 Installed Extension Packs:
00:00:02.508931   VNC (Version: 4.3.10 r93012; VRDE Module: VBoxVNC)
00:00:02.557003 SUP: Loaded VMMR0.r0 (/usr/lib/virtualbox/VMMR0.r0) at
0xffffffffc0fa9020 - ModuleInit at ffffffffc0fc67a0 and ModuleTerm at
ffffffffc0fc6a40
00:00:02.557025 SUP: VMMR0EntryEx located at ffffffffc0fc7e00,
VMMR0EntryFast at ffffffffc0fc7a20 and VMMR0EntryInt at ffffffffc0fc7a10
00:00:02.558343 Guest OS type: 'Windows7_64'
00:00:02.560036 fHMForced=true - Lots of RAM
00:00:02.560040 fHMForced=true - SMP
00:00:02.560042 fHMForced=true - 64-bit guest
00:00:02.563830 File system of '/root/VirtualBox VMs/Windows 7
XPDM/Snapshots' (snapshots) is unknown
00:00:02.563836 File system of '/root/VirtualBox VMs/Windows 7 XPDM/Windows
7 XPDM-disk2.vmdk' is ext4
00:00:02.611317 Shared clipboard mode: Off
00:00:02.642036 Drag'n'drop mode: Off
....
00:00:02.964518 VMSetError:
/build/buildd/virtualbox-4.3.10-dfsg/src/VBox/VMM/VMMR3/VM.cpp(363) int
VMR3Create(uint32_t, PCVMM2USERMETHODS, PFNVMATERROR, void*,
PFNCFGMCONSTRUCTOR, void*, VM**, UVM**); rc=VERR_NOT_SUPPORTED
00:00:02.964523 VMSetError: Not supported.
00:00:03.026185 ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005)
aIID={8ab7c520-2442-4b66-8d74-4ff1e195d2b6} aComponent={Console} aText={Not
supported. (VERR_NOT_SUPPORTED)}, preserve=false

The code base is the same that worked on windows, and the log does not
actually state what is not supported. I tried to debug the program using
the symbol package for ubuntu, but I can only get a stack trace, but not
walk through the code to find an exact line to see what goes wrong. The
only big difference i see, that in Windows I was not doing any event
pumping, while i see code that does xpcom event pumping in the examples,
could that cause this issue? VBoxManage is able to start the same virtual
machine fine, I did a diff on the logs, and actually till the error line
everything is the same, no additional errors or info. Any hints on what am
I missing?

Best Regards,
Rudolfs Bundulis
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