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https://www.cyberciti.biz/tips/howto-turn-on-linux-software-iommu-support.html
Sep 11, 2007 · Most modern Linux has support for IOMMU. An IOMMU is a device that will support mapping memory addresses. There is currently high-end branded server hardware that support this, but no desktop machines support IOMMU, AFAIK. An example IOMMU is the AGP and PCI Express graphics cards. More about IOMMU. According to wikipedia:
https://software.intel.com/en-us/blogs/2009/03/02/intels-virtualization-for-directed-io-aka-iommu-part-1/
Mar 02, 2009 · Intel's Virtualization for Directed I/O (a.k.a IOMMU) Part 1 By Ashok Raj , published on March 2, 2009, updated January 1, 2015 This is something which has existed in the risc based systems for quite some time.
https://scottlinux.com/2017/05/10/how-to-enable-iommu-support-in-fedora-linux/
How to Enable IOMMU Support in Fedora Linux Typically by default, IOMMU is not enabled in Linux. I'll show how to enable that virtualization feature on...
https://stackoverflow.com/questions/44286683/check-for-iommu-support-on-linux
Ok, thanks. I noticed that on machines where PCI passthrough is not supported, the folder /sys/class/iommu exists but it's empty, whereas on machines where it is supported it contains a folder dmar0, which itself contains devices intel-iommu power subsystem uevent.So checking if /sys/class/iommu is empty or not should already yield some answer. . How should I perform the …
https://groups.google.com/d/msg/qubes-users/Sz0Nuhi4N0o/ZtpJdoc0OY8J
VT-d, which provides IOMMU services, is a very important feature for realizing the security promises of Qubes OS. Without it, although the CPU isolates VMs, their memory lies open to relatively easy DMA-based attacks, with network devices and GPUs being some of the more well-known pieces of hardware for executing such attacks.
https://en.wikipedia.org/wiki/IOMMU
The IOMMU handles this re-mapping, allowing the native device drivers to be used in a guest operating system. In some architectures IOMMU also performs hardware interrupt re-mapping, in a manner similar to standard memory address re-mapping. Peripheral memory paging can be supported by an IOMMU.
http://developer.amd.com/wordpress/media/2013/12/48882_IOMMU.pdf
support or sustain life, or in any other application in which the failure of AMD’s product could create a situation where personal injury, death, or severe property or environmental damage may occur. 5. You have no obligation to give AMD any suggestions, comments or feedback (“Feedback”) relat- ... (IOMMU) Specification. AMD I/O ...
https://askubuntu.com/questions/85776/what-is-iommu-and-will-it-improve-my-vm-performance
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 :). SR-IOV is different, the peripheral itself must carry the support.
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