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What is IOMMU and will it improve my VM performance?
Jan 14, 2018 · 28. So long story short, the only way an iommu will help you is if you start assigning HW resources directly to the VM. Just having it doesn't make things faster. It would help to know exactly what Motherboard/CPU is advertising this feature. iommu is a system specific IO mapping mechanism and can be used with most devices.
Askubuntu.com什么是IOMMU？ - 知乎
May 24, 2019 · iommu的一个重要用途是在虚拟化技术（virtualization）：虚拟机上运行的操作系统（guest OS）通常不知道它所访问的host-physical内存地址。 如果要进行DMA操作，就有可能破坏内存，因为实际的硬件（hardware）不知道guest-physical和host-physical内存地址之间的映射 …
Zhihu.comkvm virtualization - Could multiple PCIe devices in one IOMMU …
Aug 18, 2020 · I want to know could multiple PCIe devices in one iommu group be added to different KVM VM separately? I have got failed message like "card1 is used by VM1, and card2 is in the card1's group and added to VM2, then VM2 can't boot" I have tried vfio driver, but didn't work, so what should I do? try SR-IOV? or update KVM-QEMU or update the kernel?
Askubuntu.comnvidia - KVM GPU passthrough: group 15 is not viable - Ask …
iommu Group 0 00:01.0 Host bridge [0600]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge [1022:1452] iommu Group 10 00:08.1 PCI bridge [0604]: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Internal PCIe GPP Bridge 0 to Bus B [1022:1454] iommu Group 11 00:14.0 SMBus [0c05]: Advanced Micro …
Askubuntu.comDoes Ubuntu use the IOMMU or can it be activated?
Aug 6, 2016 · I have an AMD chipset and CPU with an integrated iommu (AMD I/O Virtualization Technology). Recently, I read that these chips can be used by the system to prevent access to the full physical memory by peripherial devices, in order to prevent malicious functionality or enhance privacy, as the devices are only able to access their specific portion of the system memory.
Askubuntu.comUsing intel_iommu=on keeps system from booting - Ask Ubuntu
Aug 21, 2016 · Adding "intel_iommu=on" to /etc/default/grub => GRUB_CMDLINE_LINUX_DEFAULT argument makes the system not boot at all (columns of lines appear onscreen). Adding the "intremap=no_x2apic_optout" doesn't seem to help, either way the system won't boot when the iommu flag is set. I've tried with and without the x2apic flag.
Askubuntu.comWhy is having an error initializing AMD-Vi? - Ask Ubuntu
Oct 4, 2017 · For iommu: Advanced -> Northbridge Configuation -> iommu enable. I think Intel CPU is similar. Good luck!!
Askubuntu.comUbuntu 22.04 GPU passthrough (QEMU)
May 5, 2022 · Check that iommu is enabled $ sudo dmesg | grep -i -e DMAR -e iommu You should see message like below: [ 0.123456] pci 0000:09:00.0: Adding to iommu group 1 [ 0.234567] pci 0000:0a:00.0: Adding to iommu group 2 [ 0.345678] DMAR: Intel(R) Virtualization Technology for Directed I/O STEP 8. Find your device $ lspci -nnk
Askubuntu.comUbuntu 20.04 i915 passthrough with libvirt/kvm
Jun 10, 2020 · There was a new bit added to the 20.04 Ubuntu serverguide about passthrough, including vfio-pci. (about half way down the page). Didn't work. Same the guest shows the device, but no driver used.. Odd, the driver was loading for me in the same experiment. But you likely run linux-kvm in the guest, which lacks i915.
Askubuntu.com18.04 - GRUB strange behaviour - Ask Ubuntu
Sep 30, 2020 · I have Ubuntu 18.04 Server. I find the behaviour of GRUB is strange. When I uncomment line in /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on" intel_iommu isn't
Askubuntu.com