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https://askubuntu.com/questions/85776/what-is-iommu-and-will-it-improve-my-vm-performance
IOMMU is a system specific IO mapping mechanism and can be used with most devices. IOMMU sounds like a generic name for Intel VT-d and AMD IOV. In which case I don't think you can multiplex devices, it's a lot like PCI passthrough before all these fancy virtualization instructions existed :).
https://stackoverflow.com/questions/44286683/check-for-iommu-support-on-linux
Is there any way to check for IOMMU support when that message disappears from the log? linux pci iommu. ... but I just checked with version 2.2.0 and it's a lot more helpful: QEMU: Checking for device assignment IOMMU support ... (IOMMU appears to be disabled in kernel. Add intel_iommu=on to kernel cmdline arguments) – Ricky ...
https://www.linuxquestions.org/questions/linux-newbie-8/how-to-disable-iommu-support-4175556188/
Oct 16, 2015 · You should realize that there is a bit of reduced security when the IOMMU is disabled. This is likely not an issue, but what it does is allow the system to specify what part of memory a device can read/write from - preventing a rogue device from going where it shouldn't. Usually this is a problem with USB devices more than others.
https://forums.unraid.net/topic/44990-iommu-stuck-on-disabled/
Feb 18, 2016 · hi - I tried that, and managed to get it to boot in safe mode... however, IOMMU was still disabled. When booting in normal mode, it throws up an error, detailed in the photo linked below. I know for certain that AMD-v is supported on the CPUs, so maybe the motherboard is the issue? cheers
https://gbe0.com/networking/juniper/vmx/error-intel-iommu-disabled
IOMMU disabled. Pl enable in /boot/grub/grub.cfg This seems to occur if the host OS is CentOS - the shell script to detect the IOMMU does not validate this correctly for CentOS hosts. To verify that IOMMU is indeed enabled use the virt-host-validate command: QEMU: Checking for device assignment IOMMU...
https://forums.centos.org/viewtopic.php?t=65302
Dec 11, 2017 · While tracking down a problem in BIOS I fell across something called IOMMU which is set to DISABLED but which is supposedly "...supported in Linux based Systems". I have not a clue what it is, if it should be enabled, if so is there a performance hit, does it suck up memory or release memory, or should I simply leave it DISABLED.
https://communities.vmware.com/thread/515358
Jul 13, 2015 · How to confirm IOMMU is really disabled. My colleague installed ESXi 5.1 on a remote customer site last week. Due to the crappy hardware he had to boot the installer with noiommu. Since we don't have kvm access to the host I want to make sure it can survive a reboot and not hang during boot (as it does without noiommu).
https://scottlinux.com/2017/05/10/how-to-enable-iommu-support-in-fedora-linux/
1. First, check if IOMMU support is enabled by running this command: sudo virt-host-validate If in the output you see something similar to the following, continue on below for help.... QEMU: Checking if IOMMU is enabled by kernel : FAIL (IOMMU appears to be disabled in kernel.
https://us.informatiweb.net/tutorials/it/9-bios/215--enable-iommu-or-vt-d-in-your-motherboard-bios.html
Nov 25, 2015 · If you have an AMD CPU, the IOMMU technology will be called IOMMU. If it is not already done, enable the SVM virtualization.This is the virtualization technology that everyone knows. In the Asus UEFI BIOS, this feature is in "Advanced -> CPU configuration" and is called SVM (Secure Virtual Machine), or AMD-V or AMD Virtualization.
https://patchwork.kernel.org/patch/10946845/
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
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