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title: Performs a few checks on Phyllome OS title: Performs a few checks on Phyllome OS
description: description:
published: true published: true
date: 2022-01-25T14:42:37.414Z date: 2022-01-28T08:40:06.280Z
tags: tags:
editor: markdown editor: markdown
dateCreated: 2021-11-13T11:39:13.790Z dateCreated: 2021-11-13T11:39:13.790Z
@ -72,7 +72,9 @@ flags : fpu vme de [...] svm [...] sme sev sev_es
Your computer may be compatible with advanced hardware virtualization features (*AMD Vi* or Intel *VT-d*). Your computer may be compatible with advanced hardware virtualization features (*AMD Vi* or Intel *VT-d*).
* 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). * Check the presence of IOMMU-based hardware-assisted virtualization using the following command [^2]:
[^2]: Courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Enabling_IOMMU).
``` ```
dmesg | grep -i -e DMAR -e IOMMU dmesg | grep -i -e DMAR -e IOMMU
@ -87,11 +89,9 @@ dmesg | grep -i -e DMAR -e IOMMU
[ 0.627236] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40 [ 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). [ 0.627987] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
``` ```
* 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): * You may also want to learn how well isolated your devices are. To do so, copy and paste the following script[^1] in your terminal:
``` ```
#!/bin/bash
shopt -s nullglob
for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do
echo "IOMMU Group ${g##*/}:" echo "IOMMU Group ${g##*/}:"
for d in $g/devices/*; do for d in $g/devices/*; do
@ -100,6 +100,8 @@ for g in `find /sys/kernel/iommu_groups/* -maxdepth 0 -type d | sort -V`; do
done; done;
``` ```
[^1]: Courtesy of the [Archlinux wiki](https://wiki.archlinux.org/title/PCI_passthrough_via_OVMF#Ensuring_that_the_groups_are_valid)
* In the following case, devices are rather poorly isolated. The use of the ACS override patch may be warranted (more on that later). * In the following case, devices are rather poorly isolated. The use of the ACS override patch may be warranted (more on that later).
``` ```