docs: update gofurther/checks

gofurther/checks.md

@@ -2,11 +2,70 @@
 title: Performs a few checks on Phyllome OS
 description: 
 published: true
-date: 2021-11-13T11:39:13.790Z
+date: 2021-11-27T11:19:25.159Z
 tags: 
 editor: markdown
 dateCreated: 2021-11-13T11:39:13.790Z
 ---
 
-> Section under construction
+# Check your system
-{.is-warning}
+
+Before diving further, it is a good idea to check if everything has been set-up correctly. 
+
+## Validate generic features on the host
+
+> Those commands are valid for each and every Phyllome OS editions
+{.is-info}
+
+### Perform a global check 
+
+The command-line tool `virt-host-validate` can let you quickly check if hardware virtualization is activated, among other features. 
+
+* Use the following command to check your system:
+``` 
+virt-host-validate
+```
+
+* Make sure the result look like this:
+
+```
+[groot@phyllome ~]$ virt-host-validate
+  QEMU: Checking for hardware virtualization                                 : PASS
+  QEMU: Checking if device /dev/kvm exists                                   : PASS
+  QEMU: Checking if device /dev/kvm is accessible                            : PASS
+  QEMU: Checking if device /dev/vhost-net exists                             : PASS
+  QEMU: Checking if device /dev/net/tun exists                               : PASS
+  QEMU: Checking for cgroup 'cpu' controller support                         : PASS
+  QEMU: Checking for cgroup 'cpuacct' controller support                     : PASS
+  QEMU: Checking for cgroup 'cpuset' controller support                      : PASS
+  QEMU: Checking for cgroup 'memory' controller support                      : PASS
+  QEMU: Checking for cgroup 'devices' controller support                     : WARN (Enable 'devices' in kernel Kconfig file or mount/enable cgroup controller in your system)
+  QEMU: Checking for cgroup 'blkio' controller support                       : PASS
+  QEMU: Checking for device assignment IOMMU support                         : PASS
+  QEMU: Checking if IOMMU is enabled by kernel                               : PASS
+```
+
+> The warning message for *cgroup devices* can be disregarded. This is a [not an issue](https://gitlab.com/libvirt/libvirt/-/issues/94). This warning will not show up if the `virt-host-validate` command is executed as *root* or with a user with sudo privileges
+{.is-info}
+
+### Check for hardware virtualization
+
+* Another more generic way to check whether *hardware virtualization* is activated or not is the following command:
+
+```
+cat /proc/cpuinfo | grep svm '(vmx|svm)'
+```
+
+* Look for `svm` for AMD-based processors, or `vmx` for Intel-based processors.
+
+```
+[groot@phyllome ~]$ cat /proc/cpuinfo | grep svm '(vmx|svm)'
+flags		: fpu vme de  [...] svm [...] sme sev sev_es
+```
+
+### Check if IOMMU groups have been created are present
+
+## Validate specific features on the host
+
+> Those commands are valid for only specific Phyllome OS editions
+{.is-info}