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--- fuss:libvirt [2019/06/10 20:27] – [Passing Plan 9 Permissions] office
+++ fuss:libvirt [2025/10/21 23:26] (current) – external edit 127.0.0.1
@@ Line 365: / Line 365: @@
   * Using the group policy editor (run ''gpedit.msc'') make sure that ''Computer Configuration->Windows Settings->Security Settings->Local Policies->Security Options->Shutdown: Allow system to be shut down without having to log on'' is set to ''Enabled''.
-  * Using the registry editor (run ''regedit'') make sure that the DWORD located at ''HKEY_LOCAL_MACHINE->SOFTWARE->Microsoft->Windows NT->CurrentVersion->Windows->ShutdownWarningDialogTimeout'' is set to anything else other than ''0xffffffff'' (for example ''1''). In case the DWORD does not exist, create it and set it to a positive decimal.
+  * Using the registry editor (run ''regedit'') make sure that the DWORD located at ''HKEY_LOCAL_MACHINE->SOFTWARE->Microsoft->Windows NT->CurrentVersion->Windows->ShutdownWarningDialogTimeout'' is set to anything else other than ''0xffffffff'' (for example ''1''). In case the DWORD does not exist, create it and set it to a positive decimal. Or just import the following registry file:
+<code>
+Windows Registry Editor Version 5.00
+[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows]
+"ShutdownWarningDialogTimeout"=dword:00000001
+</code>
 You can now issue: ''shutdown windows.guest'' to shutdown a Windows domain named ''windows.guest''.
@@ Line 389: / Line 397: @@
 ====== The VirtIO Pseudo-Random Generator ======
-Guest machines can be configured to use the host random hardware for pseudo-random number generation. In order to do this you will either need ''egd'' or ''haveged'' to generate more entropy.
+Guest machines can be configured to use the host random hardware for pseudo-random number generation. First, edit the virtual machine domain configuration and add the following configuration lines:
-===== Haveged =====
-Using ''haveged'' you just need to install the daemon:
-<code bash>
-aptitude install haveged
-</code>
-and then add to the guest machine the configuration lines:
 <code xml>
     <rng model='virtio'>
@@ Line 405: / Line 404: @@
 </code>
-and restart the guest.
+Next, install the ''rng-tools'' package:
+<code bash>
+apt-get install rng-tools
+</code>
+and start ''rngd'':
+<code bash>
+systemctl restart rng-tools
+</code>
 ===== EGD =====
@@ Line 685: / Line 693: @@
 without containing the ''vnet'' substring.
+====== Strange Windows Install Errors ======
+One easy workaround for a BSoD on a fresh Windows install complaining about ''IRQL_NOT_LESS_OR_EQUAL'' or reaching a fatal error is to increase the RAM available above $3GiB$.
+====== Passing an USB Device to the Guest ======
+The USB device has to be identified first by vendor and product number which can be obtained by issuing the command:
+<code bash>
+lsusb -v
+</code>
+and checking the ''idVendor'' and ''idProduct'' field, for example:
+<code>
+  idVendor           0x2040 Hauppauge
+  idProduct          0x8268
+</code>
+Based on the vendor and product numbers, a domain XML file can be generated, such as:
+<code xml>
+    <hostdev mode='subsystem' type='usb' managed='yes'>
+      <source>
+        <vendor id='0x2040'/>
+        <product id='0x8268'/>
+      </source>
+    </hostdev>
+</code>
+that can then be inserted as part of the domain definition.
+In order to plug and unplug a device from the guest to the host and vice-versa, the following twin converse commands can be used:
+<code bash>
+virsh attach-device DOMAIN --file device.xml --config
+virsh detach-device DOMAIN --file device.xml
+</code>
+where:
+  * ''DOMAIN'' the virtual domain,
+  * ''device.xml'' contains an USB device definition as per the previous example
+The additional ''--config'' parameter passed to ''attach-device'' makes it such that the device will be included as part of the domain definition after the command executes.