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VFIO - How I game on Linu

  1. VFIO is a technology in the Linux kernel which exposes direct device access inside userspace. This allows us to pass through certain hardware-level devices into VMs running on our machine. The most common use-case for VFIO is giving VMs running on a Linux machine access to physical hardware devices, improving their connectivity or performance
  2. ary data from HP on 10G NIC is promising *netperf TCP_RR (igbvf, e1000e, tg3
  3. The VFIO driver framework provides unified APIs for direct device access. It is an IOMMU/device-agnostic framework for exposing direct device access to user space in a secure, IOMMU-protected environment. This framework is used for multiple devices, such as GPUs, network adapters, and compute accelerators. With direct device access, virtual.
  4. g performance in a Windows VM, offering a great alternative to dual-booting

VFIO-GPU-PASSTHROUGH-KVM-GUIDE Introduction. What is VFIO? When virtualizing an operating system like linux or windows, the main drawback is the lack of a proper graphics driver to bridge the gpu in your computer, to what the virtual machine guest can interact with Run sudo nano /etc/modprobe.d/vfio.conf and add the following lines to it. softdep amdgpu pre: vfio-pci softdep snd_hda_intel pre: vfio-pci options vfio-pci ids=1002:67df,1002:aaf0 In the last line replace ids with your hardware IDs. Now run sudo nano /etc/mkinitcpio.conf, and add vfio_pci vfio vfio_iommu_type1 vfio_virqfd in the Modules= line

r/VFIO: This is a subreddit to discuss all things related to VFIO and gaming on virtual machines in general. Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcut Some devices (such as many graphics cards) need to be bound to the vfio-pci driver early in the boot process. You could do this by just blacklisting the driver for that device, but that is a poor and unnecessary solution as it prevents other devices from using the same driver. A better way is to create a module alias for the device you wish to. vfio-single-amdgpu-passthrough. This repo is a tutorial for single amd gpu passthrough to various qemu VMs. After reading some great turorials by Maagu Karuri and Joe Knockenhauer I wanted to try it myself, unfortunately there were no instructions for amd gpus, just warnings about the dreaded reset bug.. So, this will be my first attempt at contributing back to this community of enthusiasts.

A lot of Linux enthusiasts would like to get into VFIO passthrough gaming, but the proposition can get daunting quickly — Getting the wrong hardware or trying to work with a generalized build you already have can throw up roadblocks, and in a lot of cases, those complications drive newcomers to the practice away To load vfio-pci early, add both the device ids and the following line to your kernel parameters: rd.driver.pre=vfio_pci We also need to add all the vfio drivers to the initramfs. Add the following file to /etc/dracut.conf.d: 10-vfio.conf add_drivers+= vfio_pci vfio vfio_iommu_type1 vfio_virqfd As with mkinitcpio, you must regenerate the. VFIO - igpu passthrough on Intel 4770 to a virtual machine (Host Os Proxmox) I am running the latest Proxmox (6.3-3 at this time, fully updated) and attempting to passthrough the onboard GPU on my Core i7 4770 CPU to a Windows 10 VM. I have already enabled iommu on the system and also told grub to not let the system claim the device by adding. # modprobe vfio_pci ids=<vendor_code>:<device_code> You can specify multiple card types as a comma-separated value. If the vfio-pci device driver is compiled into the kernel, you can configure the card types with the vfio_pci.ids= module parameter. vfio_pci.ids=<vendor_code>:<device_code> You can specify multiple card types as a comma-separated.

VFIO Introduction · kernelgo

VFIO PCI device assignment breaks free of KVM Alex Williamson <alex.williamson@redhat.com> Is that now in place of reguler vfio or do I still need to get vfio loaded? $ sudo modprobe vfio_mdev $ lsmod | grep -i vfio vfio_mdev 16384 0 mdev 24576 1 vfio_mdev Edit 3: OK, so it seems that vfio is no longer a module, but is built into the kernel 28.0k members in the VFIO community. This is a subreddit to discuss all things related to VFIO and gaming on virtual machines in general Multiple VFIO containers within a process share the same vfio_mm object. A quota mechanism is provided to prevent malicious user from exhausting available PASIDs. Currently the quota is a global parameter applied to all VFIO devices. In the future per-device quota might be supported too next prev parent reply index Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-20 17:42 [PATCH v2 00/14] Provide core infrastructure for managing open/release Jason Gunthorpe 2021-07-20 17:42 ` [PATCH v2 01/14] vfio/samples: Remove module get/put Jason Gunthorpe 2021-07-23 7:18 ` Christoph Hellwig 2021-07-20 17.

vfio-isolate is able to record all the changes that it did and storing a recipe to undo them into a file, to be executed later. sudo vfio-isolate -u /tmp/undo_description \ cpuset-create --cpus C1-4 /test.slice. This will create the test.slice cpuset, and also a file /tmp/undo_description that when executed like this VFIO No-IOMMU mode enables IOMMU groups for + devices without IOMMU backing for the purpose of re-using the VFIO + infrastructure in a non-secure mode. Use of this mode will result + in an unsupportable kernel and will therefore taint the kernel. + Device assignment to virtual machines is also not possible with + this mode since there is no.

In this tutorial, I will be using Debian Sid to bind a GPU to the vfio-pci driver. This is to make sure that the system doesn't use the GPU so that we can successfully pass it through to our guest. The process is the same for Debian Stretch and Testing. Read also: Critical Update Lands For Ryzen On Tue, Jul 20 2021, Jason Gunthorpe <jgg@nvidia.com> wrote: > From: Yishai Hadas <yishaih@nvidia.com> > > The only implementation of this in IGD returns a -ERRNO which is > implicitly cast through a size_t and then casted again and returned as a > ssize_t in vfio_pci_rw(). > > Fix the vfio_pci_regops->rw() return type to be ssize_t so all is > consistent. > > Fixes: 28541d41c9e0 (vfio/pci. VFIO Kernel Driver. An alternative to the above drivers is a vfio-pci driver. It is part of Virtual Function I/O (VFIO) kernel infrastructure and was introduced in Linux version 3.6. The VFIO infrastructure makes both device registers and device interrupts available to user space applications, and can use the IOMMU to set up IOVA mappings to. The pci-stub driver was introduced to occupy the driver slot for the device while KVM made use of it. As opposed to pci-stub, vfio is a complete interface for userspace drivers. It provides secure, isolated and IOMMU protected access to the device. pci-stub is often built into the kernel, this allows it to bind to devices earlier than drivers.

The VFIO-PCI process happens before Unraid installs any drivers. For some reason VFIO-PCI is failing to bind all the ports so Unraid goes ahead and installs the drivers. In Unraid 6.9 the VFIO-PCI process logs everything it does, so hopefully there would be a clue as to why it is not binding as expected. I would try it in 6.9 This is by far better than defining full vfio-pci devices using <qemu:arg> options, which many guides suggest, but it hides the devices from libvirt and causes all sorts of problems with device permissions and locked memory, etc. But, there's a nice compromise as Stefan shows in his last example at the link above A few things BEFORE building this package and/or commenting here: READ THE WIKI AND UNDERSTAND HOW TO USE MAKEPKG AND EVERYTHING IT ENTAILS. If you do not read the wiki and ask a stupid question, you'll either get a stupid/terse response from me or you will be ignored

From:: Alex Williamson <alex.williamson@redhat.com> To:: benh@kernel.crashing.org, aik@ozlabs.ru, david@gibson.dropbear.id.au, gregkh@linuxfoundation.or Virtual Function I/O (VFIO) Introduced to replace the old-fashioned KVM PCI device assignment (virtio). Userspace driver interface. Use IOMMU (AMD IOMMU, Intel VT-d, etc) Full PCI interrupt, MMIO and I/O port access, PCI configuration space access support. Take an abstract view of a device: to support anything A VFIO container is a collection of VFIO groups logically bound together. Linking VFIO groups together through a VFIO container makes sense when a userspace application is going to access several VFIO groups. It is more efficient to share page tables between groups and avoid TLB trashing We are pleased to announce that the VFIO/IOMMU/PCI Microconference has been accepted into the 2021 Linux Plumbers Conference. Today's high speed components commonly utilize the devices that implement the PCI interconnect specification and the system IOMMUs that provide memory and access control between the devices and the system resources. The features of this domain are constantly. VFIO is way for Linux enthusiasts (or newbies alike) to run a Full Windows machine in a Virtual Machine for Productivity workloads or more common, gaming. This allows for near native/bare-metal performance (~95% performance), Hardware Requirements: * CPU MUST Support VT-d. No VT-D no go

Requires experimental vfio-pci option x-vga=on Requires working VGA arbitration Still some device specific glitches BSODs with AMD Catalyst + HDMI audio Reset issues on some Radeon cards Code 43 on GeForce. Issues: Requires experimental vfio-pci option, x-vga=on Not supported by libvirt because experimenta VFIO PassThrough 对于VFIO的概述可以参考文章vfio 概述。这里以PCI设备为例讲述VFIO PassThrough具体实现(VFIO不仅仅支持PCI设备)。对于一个透传给虚机的PCI设备,主要处理config空间透传、BAR空间透传和中断三方面,下面分别讲述如何实现这两方面的透传 Modules: raid0 raid1 md_mod ext4 vfat ahci vfio_pci vfio vfio_iommu_type1 vfio_virqfd usbhid it87 (aur version is unmaintained and the support for the ITE8686E chip on this board is limited, replace it87 source with that which is found here for more comprehensive support) Virsh: virsh-5.10.0; Qemu: qemu-system-x86_64-4.2. machine='pc-i440fx-4.2

  1. Open the Windows Explorer and navigate to the CD-ROM drive. Simply execute (double-click on) virtio-win-gt-x64. Follow its instructions. (Optional) use the virtio-win-guest-tools wizard to install the QEMU Guest Agent and the SPICE agent for an improved remote-viewer experience. Reboot VM
  2. Another option is to not disable the dedicated GPU with vfio-pci at all and run on it while not using the VM. This is pretty annoying though since you have to restart everything when starting the VM
  3. While PCIe passthrough (the process of assigning a PCIe device to a VM, also known as device assignment) is supported through a mostly architecture-agnostic subsystem called VFIO, there are intricate details of an Arm-based system that require special support for Message Signaled Interrupts (MSIs) in the context of VFIO passthrough on Arm server systems
  4. vfio: Support for RamDiscardManager in the !vIOMMU case. Implement support for RamDiscardManager, to prepare for virtio-mem support. Instead of mapping the whole memory section, we only map populated parts and update the mapping when notified about discarding/population of memory via the RamDiscardListener
  5. Modular VFIO device and IOMMU drivers vfio-pci allows PCI device access vfio-iommu-type1 works with current IOMMU API and x86 style guest mapping Open for other architectures and platforms to expose their specific IOMMU features and devices (POWER SPAPR support to follow soon

VFIO Mediated devices — The Linux Kernel documentatio

  1. V vfio-single-gpu-passthrough Project information Project information Activity Labels Members Repository Repository Files Commits Branches Tags Contributors Graph Compare Locked Files Issues 1 Issues 1 List Boards Service Desk Milestones Iterations Merge requests 1 Merge requests 1 Requirements Requirements CI/CD CI/CD Pipelines Jobs Schedule
  2. The VFIO driver is an IOMMU/device 10 agnostic framework for exposing direct device access to userspace, in 11 a secure, IOMMU protected environment. In other words, this allows 12 safe [2]_, non-privileged, userspace drivers. 13 14 Why do we want that
  3. From: Max Gurtovoy <mgurtovoy@nvidia.com> This pairs with vfio_init_group_dev() and allows undoing any state that is stored in the vfio_device unrelated to registration. Add appropriately placed calls to all the drivers. The following patch will use this to add pre-registration state for the device set
  4. KVM is an free and open source virtualization solution in a kernel module. Although it is often simply referred to as KVM, the actual hypervisor is QEMU. QEMU runs from user-space, but can integrate with KVM, providing better performance by leveraging the hardware from kernel-space. QEMU can virtualize x86, PowerPC, and S390 guests, amongst others

Steam Community :: Group :: VFI

  1. Method 3 - Windows. Download and install GPU-Z. Open GPU-Z and backup the GPU BIOS . Right next to the Bios Version; in my case 80.04.C3.00.0F, there is an icon for backup. A file named GK104.rom will be created (Your file name will be different). Edit the VBIOS
  2. -device vfio-pci,host=01:00.0,multifunction=on,x-vga=on,romfile=Gigabyte.GTX970.rom \-device vfio-pci,host=01:00.1 and I am still getting Code 43 errors from the driver. Any suggestions? Besides the last desperate attempt to disassemble Nvidia driver and NOP the virtualization check..
  3. vfio vfio_iommu_type1 vfio_pci vfio_virqfd Note that in the 5.4 based kernels some of those modules are already built into the kernel directly. IOMMU Interrupt Remapping. It will not be possible to use PCI passthrough without interrupt remapping

GitHub - ethannij/VFIO-GPU-PASSTHROUGH-KVM-GUID

OpenBSD in Stereo with Linux VFIO - joshua stein

VFIO Guide for GPU Passthrough · GitHu

VFIO mdev provides a framework for subdevice assignment and reuses existing VFIO uAPI to handle common passthrough-related requirements. However, subdevice (e.g. ADI defined in Intel Scalable IOV) might not be a PCI endpoint (e.g. just a work queue), thus requires some degree of emulation/mediation in kernel to fit into VFIO device API -device vfio-pci,host=02:00.0,multifunction=on-device vfio-pci,host=02:00.1 Here we specify the graphics card to pass through to the guest, using vfio-pci. Fill in the PCI IDs you found under Part 3 above. It is a multifunction device (graphics and sound). Make sure to pass through both the video and the sound part (02:00.0 and 02:00.1 in my case) Doc Text: .No-IOMMU mode for VFIO drivers As a Technology Preview, this update adds No-IOMMU mode for virtual function I/O (VFIO) drivers. The No-IOMMU mode provides the user with full user-space I/O (UIO) access to a direct memory access (DMA)-capable device without a I/O memory management unit (IOMMU). Note that in addition to not being. 42 For example, the mediated VFIO mdev driver is designed for mediated devices and 43 supports VFIO APIs. The mediated bus driver adds a mediated device to and 44 removes it from a VFIO group. 45 46 The following high-level block diagram shows the main components and interfaces 47 in the VFIO mediated driver framewor AMD-Vi/IOMMU/VFIO PCI passthrough broken on PRIME X470-PRO. Motherboard model: PRIME X470-PRO. UEFI Version: 5204. CPU: Ryzen 2700X. Memory kit part number (s) and amount in GB: G-Skill F4-3200C16-8GVGB x 4 = 32 GB. GPU: EVGA GTX 980

kvm - GPU passthrough works with UEFI firmware but not

Alex Williamson <alex.williamson@redhat.com> wrote: > vfio_pci_mmap_fault () incorrectly makes use of io_remap_pfn_range () > from within a vm_ops fault handler. This function will trigger a. > BUG_ON if it encounters a populated pte within the remapped range, > where any fault is meant to populate the entire vma. Concurrent * Therefore, when using IOTLB flush sync interface, VFIO need to keep track * of these regions (currently using a list). * * This value specifies maximum number of regions for each IOTLB flush sync. */ #define VFIO_IOMMU_TLB_SYNC_MAX 512 static size_t unmap_unpin_fast.

Nvidia control panel (in case nvidia GPU is used) Open 3D settings branch -> Select Manage 3D settings -> Select Global settings tab. set Power Management mode -> Prefer maximum performance. set Low Latency Mode -> On. Windows 1903 is used on purpose, because it brings better Ryzen SMT support Device Pass-Through Using VFIO GPIO Pass-Through Prototype. This is a proof-of-concept showing how to provide guest access to an R-Car GPIO controller block on the Renesas Salvator-X and Salvator-XS boards.. Host Sid -device vfio-pci,host=09:00.1 just like above - this is the audio device that is in the same IOMMU group as the video device.-monitor stdio this will drop you into a qemu command line (they call it a monitor) once you launch the VM, allowing you to do things

VFIO Discussion and Support - reddi

Subscribing to vfio-users: Subscribe to vfio-users by filling out the following form. You will be sent email requesting confirmation, to prevent others from gratuitously subscribing you. This is a hidden list, which means that the list of members is available only to the list administrator.. To: vfio-users redhat com <vfio-users redhat com> Subject: [vfio-users] Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff when attempting to dump PCI ROM; Date: Sun, 10 Mar 2019 18:06:37 -040 [Qemu-devel] [RFC v2 3/6] vfio: add vfio-platform support Eric Auger eric.auger at linaro.org Tue May 20 02:44:26 EDT 2014. Previous message: [PATCH v6 1/4] add ARMv7 HYP API to flush VM TLBs without address param Next message: Drop regular KVM/ARM Technical Sync-up Call Messages sorted by 如果使用vfio-pci透传PCI-E设备,我们需要使用QEMU机器模型Q35,并添加相应的PCI-E总线参数,除此之外,设备驱动的解绑与绑定操作可以简化为如下所示的脚本操作: [root@node3 ~]# cat vfio-bind.sh #!/bin/bash. modprobe vfio-pci. for var in $@; d Yes, I know about DualCoder's vGPU enabler. I teased it in the video above around April 2 when it was live for patrons and floatplane subs. Video soon! There..

options vfio-pci ids=10de:139b,8086:1901 sudo update-initramfs -u. After a reboot, I checked if the kernel driver in use for the NVidia card is vfio-pci. However, as mentioned, this is not the case. When I checked the syslog however, I do see that the two devices are added. systemd-modules-load [1189]: Inserted module 'vfio' systemd-modules. vfio vfio_iommu_type1 vfio_pci ids=1002:699f,1002:aae0 We will also create explicit configurations for the modules in /etc/modprobe.d ; Again, this is likely overkill but we had some difficulty on the live stream echo options vfio-pci ids=10de:1c81,10de:0fb9 disable_vga=1 > /etc/modprobe.d/vfio.conf Once that is done, reboot your system. Once the reboot is complete, use lspci -v to check that the NVidia card is now using the vfio-pci instead of any NVidia driver as can be seen in my example above Description of problem: Libvirt fails to set ownership of /dev/vfio/X (where X is used iommu group) if qemu is not running under root. Version-Release number of selected component (if applicable): libvirt-daemon-1.2.13-1.el7.x86_64 libvirt-daemon-driver-qemu-1.2.13-1.el7.x86_64 libvirt-lock-sanlock-1.2.13-1.el7.x86_64 libvirt-daemon-driver-storage-1.2.13-1.el7.x86_64 libvirt-docs-1.2.13-1.el7.

QEMU Virtual Machine PCIe Device Passthrough Using vfio-pc

6) Assign GPU to vfio Use this to create the file that assigns the HW to vfio: echo options vfio-pci ids=10de:1b81,10de:10f0 > /etc/modprobe.d/vfio.conf After rebooting, running lspci -v will confirm that the GPU and Audio device are using the vfio driver: Kernel driver in use: vfio-pci 7) Create VM (but do not start it! diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c index a5c77ccb24f70a..725cd2fe675190 100644 --- a/drivers/vfio/mdev/vfio_mdev.c +++ b.

VFIO passthrough of DPAA2 devices is currently only available in kernels with NXP's LSDK patchset. At the time of writing (2020-09), support for vfio-fsl-mc has not been accepted into the mainline kernel. The latest submitted patchset is from 2020-08-26 vfio and fsl-mc bus The VFIO driver is a framework for exposing direct device access to userspace. Virtual machine technology uses VFIO to assign physical device to VMs for highest possible IO performance. In this post, I will just focus the driver of VFIO. VFIO's basic idea is showing in the following figure. This is from Alex's talk An Introduction to PCI. In order to allow VFIO to happen, we need to adjust the boot process to ensure that the VFIO drivers are loaded and bound to the relevant PCIe devices rather than the normal ones. Getting the Device IDs. In my case, I wanted to specifically pass-through my NVIDIA GTX1080. I can find the specific devices by running the following command QEMU uses VFIO to assign physical devices to VMs. When using vfio, the qemu command line should add following option: -device vfio-pci,host=00:12.0,id=net0. This adds a vfio-pci device sets the physical device's path to 'host'. As we have said in the VFIO driver analysis post VFIO decomposes the physical device as a set of userspace API.

here is the qemu log 2016-08-28T02:52:05.699498Z qemu-system-x86_64: -device vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on: vfio_dma_map. 28.0k members in the VFIO community. This is a subreddit to discuss all things related to VFIO and gaming on virtual machines in general The lesson: It's not always the VM. Coming from someone who used VFIO for a couple years now, it works really well these days, I'm always impressed by the performance and pretty-much-native-feel, together with the ability to manage disk usage with ZFS pools, have snapshots, easy backups, network filters, etc..

Assignable Interfaces in Intel® Scalable I/O

IMPORTANT UPDATE: I got the card earlier than expected so just decided to try the steps I know now. I have added the ID of the elgato card to refind_linux.conf under vfio-pci.ids where the ID of the USB 3 card I have stubbed for the VM also is. I've also added vfio-pci.disable_idle_d3=1 as this was suggested by others. Firstly, I noticed that after adding these and rebooting, the command lspci. next prev parent reply index Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-26 13:12 [PATCH 00/10] KVM PCIe/MSI passthrough on ARM/ARM64 Eric Auger 2016-01-26 13:12 ` [PATCH 01/10] iommu: Add DOMAIN_ATTR_MSI_MAPPING attribute Eric Auger 2016-01-26 13:12 ` [PATCH 02/10] vfio: expose MSI mapping requirement through VFIO_IOMMU_GET_INFO Eric Auger 2016-01-26 13. The device set is established by providing a 'set_id' pointer. All vfio_device's that provide the same pointer will be joined to the same singleton memory and lock across the whole set. This effectively replaces the oddly named reflck

GitHub - cosminmocan/vfio-single-amdgpu-passthrough: This

QEMU allows to use that technology through the VFIO driver which is an IOMMU/device agnostic framework for exposing direct device access to userspace, in a secure, IOMMU protected environment. In other words, this allows safe, non-privileged, userspace drivers. Initially developed by Cisco, VFIO is now maintened by Alex Williamson at Red Hat vfio-mdev has become popular over the last few years for assigning certain classes of devices to guests. On the s390x side, vfio-ccw and vfio-ap are using the vfio-mdev framework for making channel devices and crypto adapters accessible to guests 通过图可以发现 1070Ti 使用 nvidia 和snd_hda_intel, 1050Ti 使用vfio-pci,说明1050Ti成功和host隔离。接下来就可以将1050Ti分配给虚拟机。 3. 将GPU直通给虚拟机 1. 将GPU直通给MacOS. 打开virt-manager 中的macOS进行配置. 删除macOS原有的显示硬

'Easy' VFIO Gaming PC Under $1000 - Build Guide - The

VFIO kernel is usually present by default in all distributions, however please consult your distributions documentation to make sure that is the case. For DMA mapping of either external memory or hugepages, VFIO interface is used. VFIO does not support partial unmap of once mapped memory Note: linux-vfio-lts can be substituted with linux-vfio for the bleeding edge kernel. However, I strongly recommend that you stick with linux-vfio-lts because bugs can be introduced in newer kernels. Note: linux-vfio-lts or linux-vfio is not needed if you are not using an intel iGPU for the host and you are sure your processor has ACS.

debian-desktop - The Passthrough POST

After conversion the set_id will be sourced from: - A struct device from a fsl_mc_device (fsl) - A struct pci_slot (pci) - A struct pci_bus (pci) - The struct vfio_device (everything) The design ensures that the above pointers are live as long as the vfio_device is registered, so they form reliable unique keys to group vfio_devices into sets This is intented for people who wish to pass-through a GPU to a virtual machine using the KVM hypervisor, QEMU and vfio-pci. NOTE: AMD RADEON 5xxx, 6xxx, 7xxx, 2xx and NVIDIA GEFORCE 7, 8, 4xx, 5xx, 6xx, 7xx 9xx have been reported working with this, passing though an intel IGD is not supported YET

GPU passthrough with single GPU - VM Engine (KVM) - UnraidIOMMU Disbaled on HP xw4600 Workstation - General Support

Subject: Re: [vfio-users] FYI: SR-IOV GPU from AMD Date : Tue, 08 Sep 2015 08:59:59 +0000 I think the 'world's first' refers to their adoption of the PCIe standardized SR-IOV technology for sharing the GPU Linux iommu和vfio概念空间解构. 「已注销」. 54 人 赞同了该文章. 最近和一些硬件和相关驱动设计的同学讨论SMMU的设计需求,双方讨论的空间不太一致,我写一个文档澄清一下这些概念。. 我们首先得厘清两个概念,当我们说SMMU的时候,硬件设计同学心中是那个. VFIO简介. Many modern system now provide DMA and interrupt remapping facilities to help ensure I/O devices behave within the boundaries they've been allotted. The VFIO driver is an IOMMU/device agnostic framework for exposing direct device access to userspace, in a secure, IOMMU protected environment Slow guest startup caused by using VFIO a.k.a being lost without a map(ing) Disclaimer: for now this is about the debugging where the time sink is, it mentions ways to mitigate some effects but not a fix