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title: Performs a few checks on Phyllome OS
description:
published: true
date: 2021-11-27T15:27:15.262Z
date: 2022-01-25T14:42:37.414Z
tags:
editor: markdown
dateCreated: 2021-11-13T11:39:13.790Z
---
# Check your system
# Checkup
Before diving further, it is a good idea to check if everything has been set-up correctly.
Before creating your first virtual machine, it is a good idea to check if everything is correctly set up.
## Validate generic features on the host
## Perform a global checkup
> 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.
The command-line tool `virt-host-validate` allows you to check whether virtualization features are activated or not.
* Use the following command to check your system:
```
@ -39,30 +34,33 @@ virt-host-validate
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 'devices' controller support : WARN[^1] (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
[^1]: The warning message for *cgroup devices* can be disregarded, as it won't show up if the `virt-host-validate` command is executed as *root*. [Related discussion](https://gitlab.com/libvirt/libvirt/-/issues/94).
> If `/dev/kvm` is not found, please ensure that your hardware [is indeed compatible](/deploy/prepare#meet-the-requirements) and that hardware-assisted virtualization [has been activated](/deploy/prepare#enable-hardware-assisted-virtualization) in the BIOS/EFI.
{.is-info}
### Check for hardware virtualization
* Another more generic way to check whether *hardware virtualization* is activated or not is the following command fo Intel CPUs:
## Specific checkup
### Hardware-assisted virtualization (1st gen)
* For Intel CPUs, you can use the following more specific command to check whether *hardware virtualization* is activated:
```
cat /proc/cpuinfo | grep vmx
```
* And this command for AMD CPUs
* For AMD CPUs, the following command can be used:
```
cat /proc/cpuinfo | grep svm
```
* Look for `svm` for AMD-based processors, or `vmx` for Intel-based processors.
```
@ -70,25 +68,16 @@ cat /proc/cpuinfo | grep svm
flags : fpu vme de [...] svm [...] sme sev sev_es
```
## Validate specific features on the host
### Hardware-assisted virtualization (2st gen, IOMMU-based)
> Those commands are valid for only specific Phyllome OS editions
{.is-info}
Your computer may be compatible with advanced hardware virtualization features (*AMD Vi* or Intel *VT-d*).
### IOMMU-related checks
> Under construction
{.is-warning}
If your computer ships with advanced hardware virtualization features (*AMD Vi* or Intel *VT-d*), Phyllome OS should have automatically activated them.
* Verify if that is the case by using the following command, courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Enabling_IOMMU).
* Check the presence of IOMMU-based hardware-assisted virtualization using the following command, courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Enabling_IOMMU).
```
dmesg | grep -i -e DMAR -e IOMMU
```
* Make sure the result look like this:
* Make sure the result looks like this:
```
[ 0.600228] iommu: Default domain type: Translated
[ 0.624416] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
@ -98,7 +87,7 @@ dmesg | grep -i -e DMAR -e IOMMU
[ 0.627236] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[ 0.627987] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
```
* You may also want to learn how isolated your devices are. To do that, use the following script, courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Ensuring_that_the_groups_are_valid):
* You may also want to learn how well isolated your devices are. To do so, use the following script, courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Ensuring_that_the_groups_are_valid):
```
#!/bin/bash
@ -111,6 +100,8 @@ for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do
done;
```
* In the following case, devices are rather poorly isolated. The use of the ACS override patch may be warranted (more on that later).
```
IOMMU Group 0:
[...]
@ -131,7 +122,7 @@ IOMMU Group 14:
IOMMU Group 15:
0b:00.4 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller [1022:1487]
```
### Intel GVT-d related checks
> Under construction
{.is-warning}
---
*[**Go to parent page**](/gofurther/)*