doc(XCP-ng): Correct the instructions for enabling Viridian for other Windows-based VMs

Signed-off-by: Thomas Moraine <[email protected]>

Author: thomas-dkmt

docs/vms/vms.md

@@ -76,11 +76,24 @@ Viridian is a codename for [Hyper-V](https://learn.microsoft.com/en-us/windows-s
 
 Viridian extensions —referred to as "Viridian enlightenments" by Microsoft— are used by any "recent" Windows OS to work properly. Make sure they are enabled for your VM. 
 
-:::tip
+:::warning
 
 Viridian enlightenments are enabled by default on Windows VM templates included with XCP-ng. 
 
-To enable Viridian enlightenments to other Windows VM templates, you need to enable them manually. To do this, run  `xe vm-param-set uuid=<vm uuid> platform:viridian=true`.
+To enable Viridian enlightenments for other Windows VM templates, you need to: 
+
+1. **Enable Viridian**. To do this, run `xe vm-param-set uuid=<vm uuid> platform:viridian=true` in your VM.
+2. **Enable the extra Viridian parameters** necessary for your template to run properly with XCP-ng. To do this, run the same `xe` command in your VM, but change the arguments with the following:
+
+```
+"device_id": "0002", // ID used by XCP-ng to detect Windows VMs
+"viridian": "true",
+"viridian_time_ref_count": "true",
+"viridian_reference_tsc": "true",
+"viridian_apic_assist": "true",
+"viridian_crash_ctl": "true",
+"viridian_stimer": "true"
+```
 
 :::