Iommu Support

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IoMmu model - Windows drivers Microsoft Docs

    https://docs.microsoft.com/en-us/windows-hardware/drivers/display/iommu-model
    In the IoMmu model, the driver continues to allocate video memory for the GPU using the video memory manager's Allocate service. This allow the user mode driver to follow the residency model, support the Microsoft DirectX resource sharing model, ensure that primary surfaces are visible to the kernel, and are mapped into aperture before being displayed.

AMD I/O Virtualization Technology (IOMMU) Specification

    https://www.amd.com/system/files/TechDocs/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 48882—Rev 3.00 ...

What is IOMMU and will it improve my VM performance?

    https://askubuntu.com/questions/85776/what-is-iommu-and-will-it-improve-my-vm-performance
    The big win for IOMMU support is that we can change which devices we pass through at run time. Before we had to specify a range of devices in the kernel arg list and only those peripherals were eligible for passthrough. IOMMU lets you remap devices as you see fit. Again this is exclusive access, either your host is using it, or one of the VMs is.

How to Enable IOMMU Support in Fedora Linux – scottlinux ...

    https://scottlinux.com/2017/05/10/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 Fedora Linux! 1. First, check if IOMMU support is enabled by running this command:

pci - check for IOMMU support on linux - Stack Overflow

    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 …

Enable IOMMU or VT-d in your motherboard BIOS - BIOS ...

    https://us.informatiweb.net/tutorials/it/9-bios/215--enable-iommu-or-vt-d-in-your-motherboard-bios.html
    Nov 25, 2015 · Then, if your motherboard supports it, you will find the IOMMU option in : Advanced -> North Bridge. Finally, it is possible that an "IOMMU Mode" option is also available. This option is different from the "IOMMU" option and allows you (as shown in the image) to redirect 32 bits I/O to 64 bits I/O.

IOMMU ON or OFF? Tom's Hardware Forum

    https://forums.tomshardware.com/threads/iommu-on-or-off.2402564/
    Aug 22, 2019 · IOMMU is Intel's name for VT-x (virtual memory & execution) and VT-d (virtual PCIe addressing for peripherals). Microsoft does not support VT-d for cloud clusters in that it …

IOMMU - What does IOMMU stand for? The Free Dictionary

    https://acronyms.thefreedictionary.com/IOMMU
    As introduced in Section 2 and Section 3, the native KVM implementation on IOMMU support for virtual machines adopts the direct mapping strategy with lowest overhead and optimal performance, but no DMA security guarantees.



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