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112 lines
7.8 KiB
Markdown
112 lines
7.8 KiB
Markdown
---
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layout: doc
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title: Windows Tools 3
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permalink: /doc/windows-tools-3/
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redirect_from:
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- /en/doc/windows-tools-3/
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- /doc/WindowsTools3/
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- /doc/WindowsTools/
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- /wiki/WindowsTools/
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---
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Qubes Windows Tools: advanced settings and troubleshooting
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==========================================================
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**This document only applies to Qubes R3 (tools version 3.x)**
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*Only 64-bit Windows 7 (any edition) is supported currently. Windows 8+ support is under development.*
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Installable components
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----------------------
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Qubes Windows Tools (QWT for short) contain several components than can be enabled or disabled during installation:
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- Shared components (required): common libraries used by QWT components.
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- Xen PV drivers: drivers for the virtual hardware exposed by Xen.
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- Base Xen PV Drivers (required): paravirtual bus and interface drivers.
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- Xen PV Disk Drivers: paravirtual storage drivers.
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- Xen PV Network Drivers: paravirtual network drivers.
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- Qubes Core Agent: qrexec agent and services. Needed for proper integration with Qubes.
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- Move user profiles: user profile directory (c:\users) is moved to VM's private disk backed by private.img file in dom0 (useful mainly for HVM templates).
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- Qubes GUI Agent: video driver and gui agent that enable seamless showing of Windows applications on the secure Qubes desktop.
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- Disable UAC: User Account Control may interfere with QWT and doesn't really provide any additional benefits in Qubes environment.
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**In testing VMs only** it's probably a good idea to install a VNC server before installing QWT. If something goes very wrong with the Qubes gui agent, a VNC server should still allow access to the OS.
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**NOTE**: Xen PV disk drivers are not installed by default. This is because they seem to cause severe problems, including disk image/files corruption in Qubes HVMs. We're investigating this. *However*, the problem doesn't always occur in tests -- disk drivers often work *if they are installed separately after the main portion of QWT is up and running*. **Do this at your own risk** of course, but we welcome reports of success/failure in any case. With disk PV drivers absent `qvm-block` will not work for the VM, but you can still use standard Qubes inter-VM file copying mechanisms.
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Verbose installation
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--------------------
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If the install process fails you can retry it using the command line below to get a detailed installation log (and send that to us):
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`msiexec /i path-to-qubes-tools.msi /lv path-to-log-file.txt`
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Uninstalling QWT 3.x is **not recommended**. It will most likely make the OS non-bootable because drivers for Xen storage devices will be uninstalled. This will be fixed in the future.
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Configuration
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-------------
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Starting from version 2.2.\* various aspects of Qubes Windows Tools can be configured through registry. Main configuration key is located in `HKEY_LOCAL_MACHINE\SOFTWARE\Invisible Things Lab\Qubes Tools`. Configuration values set on this level are global to all QWT components. It's possible to override global values with component-specific keys, this is useful mainly for setting log verbosity for troubleshooting. Possible configuration values are:
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|**Name**|**Type**|**Description**|**Default value**|
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|:-------|:-------|:--------------|:----------------|
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|LogDir|String|Directory where logs are created|c:\\Program Files\\Invisible Things Lab\\Qubes Tools\\log|
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|LogLevel|DWORD|Log verbosity (see below)|2 (INFO)|
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|LogRetention|DWORD|Maximum age of log files (in seconds), older logs are automatically deleted|604800 (7 days)|
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Possible log levels:
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|1|Error|Serious errors that most likely cause irrecoverable failures|
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|2|Warning|Unexpected but non-fatal events|
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|3|Info|Useful information (default)|
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|4|Debug|Internal state dumps for troubleshooting|
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|5|Verbose|Trace most function calls|
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Debug and Verbose levels can generate large volume of logs and are intended for development/troubleshooting only.
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To override global settings for a specific component, create a new key under the root key mentioned above and name it as the executable name, without `.exe` extension. For example, to change qrexec-agent's log level to Debug, set it like this:
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Component-specific settings currently available:
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|**Component**|**Setting**|**Type**|**Description**|**Default value**|
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|:------------|:----------|:-------|:--------------|:----------------|
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|qga|DisableCursor|DWORD|Disable cursor in the VM. Useful for integration with Qubes desktop so you don't see two cursors. Can be disabled if you plan to use the VM through a remote desktop connection of some sort. Needs gui agent restart to apply change (locking OS/logoff should be enough since qga is restarted on desktop change).|1|
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Troubleshooting
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---------------
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If the VM is inaccessible (doesn't respond to qrexec commands, gui is not functioning), try to boot it in safe mode:
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- `qvm-start --debug vmname`
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- mash F8 on the boot screen to enable boot options and select Safe Mode (optionally with networking)
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Safe Mode should at least give you access to logs (see above).
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**Please include appropriate logs when reporting bugs/problems.** Starting from version 2.4.2 logs contain QWT version, but if you're using an earlier version be sure to mention which one. If the OS crashes (BSOD) please include the BSOD code and parameters in your bug report. The BSOD screen should be visible if you run the VM in debug mode (`qvm-start --debug vmname`). If it's not visible or the VM reboots automatically, try to start Windows in safe mode (see above) and 1) disable automatic restart on BSOD (Control Panel - System - Advanced system settings - Advanced - Startup and recovery), 2) check the system event log for BSOD events. If you can, send the `memory.dmp` dump file from c:\Windows.
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Xen logs (/var/log/xen/console/guest-*) are also useful as they contain pvdrivers diagnostic output.
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If a specific component is malfunctioning, you can increase its log verbosity as explained above to get more troubleshooting information. Below is a list of components:
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|qrexec-agent|Responsible for most communication with Qubes (dom0 and other domains), secure clipboard, file copying, qrexec services.|
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|qrexec-wrapper|Helper executable that's responsible for launching qrexec services, handling their I/O and vchan communication.|
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|qrexec-client-vm|Used for communications by the qrexec protocol.|
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|qga|Gui agent.|
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|QgaWatchdog|Service that monitors session/desktop changes (logon/logoff/locking/UAC...) and simulates SAS sequence (ctrl-alt-del).|
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|qubesdb-daemon|Service for accessing Qubes configuration database.|
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|network-setup|Service that sets up network parameters according to VM's configuration.|
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|prepare-volume|Utility that initializes and formats the disk backed by `private.img` file. It's registered to run on next system boot during QWT setup, if that feature is selected (it can't run *during* the setup because Xen block device drivers are not yet active). It in turn registers move-profiles (see below) to run at early boot.|
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|relocate-dir|Utility that moves user profiles directory to the private disk. It's registered as an early boot native executable (similar to chkdsk) so it can run before any profile files are opened by some other process. Its log is in a fixed location: `c:\move-profiles.log` (it can't use our common logger library so none of the log settings apply).|
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Updates
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-------
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When we publish new QWT version (which is announced on `qubes-users` Google Group) it's usually pushed to the `current-testing` or `unstable` repository first. To use versions from current-testing, run this in dom0:
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`qubes-dom0-update --enablerepo=qubes-dom0-current-testing qubes-windows-tools`
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That command will download a new QWT .iso from the testing repository. It goes without saying that you should **backup your VMs** before installing anything from testing repos.
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