The latest Microsoft Windows Server 2016 Technical Preview 4 add an interesting new features in Hyper-V: Discrete Device Assignment. This feature implement a “device passthrough” for virtual machines running on Hyper-V: users can now take some of the PCI Express devices in their systems and pass them through directly to a guest VM.
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The software uses a Serial COM port. Home > Virtualization > Virtualization. Hyper V 2008 R2 Serial. But ESX can handle USB pass through that could be used. The server was runnning Proxmox VE 1.8. There no options available within the web gui to configure usb pass-through so far. You will need to perform some configuration actions from the command line. I’ve mainly tests usb pass-through against Windows KVM guests virtual machines. Jul 03, 2018 Virtio Serial Driver. This is a virtual serial port for communication between the hypervisor and the VM. Right click on 'PCI Simple Communications Controller' and select 'Update Driver Software.' Follow the same steps for the Ethernet adapter above to complete the driver installation. Creating virtual serial port may be trivial or complicated depending on your requirements. If you only need to propagate data from real port to virtual port (and vice versa), you can use tools like socat, remserial, or conserver. See usage examples here: 1, 2, 3.
• the IDE controller, has a design which goes back to the 1984 PC/AT disk controller. Even if this controller has been superseded by recent designs, each and every OS you can think of has support for it, making it a great choice if you want to run an OS released before 2003. You can connect up to 4 devices on this controller. Cisco asa activation key gns3 2017 and software.
• the SATA (Serial ATA) controller, dating from 2003, has a more modern design, allowing higher throughput and a greater number of devices to be connected. You can connect up to 6 devices on this controller.
Interior Pass Through Windows
• the SCSI controller, designed in 1985, is commonly found on server grade hardware, and can connect up to 14 storage devices. Proxmox VE emulates by default a LSI 53C895A controller. A SCSI controller of type VirtIO SCSI is the recommended setting if you aim for performance and is automatically selected for newly created Linux VMs since Proxmox VE 4.3. Linux distributions have support for this controller since 2012, and FreeBSD since 2014. For Windows OSes, you need to provide an extra iso containing the drivers during the installation.
Sliding Pass Through Windows
If you aim at maximum performance, you can select a SCSI controller of type VirtIO SCSI single which will allow you to select the IO Thread option. When selecting VirtIO SCSI single Qemu will create a new controller for each disk, instead of adding all disks to the same controller. • The VirtIO Block controller, often just called VirtIO or virtio-blk, is an older type of paravirtualized controller. It has been superseded by the VirtIO SCSI Controller, in terms of features.
Introduction
PCI passthrough allows you to use a physical PCI device (graphics card, network card) inside a VM (KVM virtualization only).If you 'PCI passthrough' a device, the device is not available to the host anymore.
Note:
PCI passthrough is an experimental feature in Proxmox VE
Intel CPUedit:
change
to
then
Then run 'dmesg | grep -e DMAR -e IOMMU' from the command line. If there is no output, then something is wrong.
AMD CPU
Edit:
Change:
To:
Required modules
add to /etc/modules
IOMMU interrupt remapping
it will not be possible to use PCI passthrough without interrupt remapping.
Device assignment will fail with a 'Failed to assign device '[device name]' : Operation not permitted' error for users of KVM, and a 'Interrupt Remapping hardware not found, passing devices to unprivileged domains is insecure.
Systems which don't support interrupt remapping:
1) Run the 'dmesg | grep ecap' command.
2) On the IOMMU lines, the hexadecimal value after 'ecap' indicates whether interrupt remapping is supported. If the last character of this value is an 8, 9, a, b, c, d, e, or an f, interrupt remapping is supported. For example, 'ecap 1000' indicates there is no interrupt remapping support. 'ecap 10207f' indicates interrupt remapping support, as the last character is an 'f'.
Interrupt remapping will only be enabled if every IOMMU supports it.
Alternatively, run the following script to determine if your system has interrupt remapping support:
If your system doesn't support interrupt remapping,
you can allow unsafe interrupts with:
Verify IOMMU isolation
To have pci passthrough working fine, you need dedicated iommu group foryour pci devices
You should have something like
To have separate iommu, your processor need to have support fora feature called ACS (Access Control Services).
All Xeon processor support them (E3,E5) excluding Xeon E3-1200
For intel Core , it's different, only some processors support ACS
UPDATE ME : AMD processors ?
If you don't have dedicated iommu,your can try :
1) move the card to another pci slot
2) add 'pcie_acs_override=downstream' to grub options, which can help on some setup with bad ACS implementation.
More infos : Determine your PCI card address, and configure your VM
Locate your card using 'lspci'. The address should be in the form of: 01:00.0
Manually edit the node.conf file. It can be located at: /etc/pve/qemu-server/vmid.conf.
Add this line to the end of the file:
If you have a multi-function device (like a vga card with embedded audio chipset),
you can pass all functions manually with
or
to pass all functions automatically
PCI EXPRESS PASSTHROUGH
simple pci-express passthrough
GPU PASSTHROUGH
For GPU, it's good that host don't try to use the GPU, and avoids issues with the host driver unbinding and re-binding to the device.
First, find the device and vendor id of your vga card
The Vendor:Device IDs for my GPU and audio functions are therefore 10de:1381, 10de:0fbc.
Then, create a file
Then blacklist drivers
For VM configuration, They are 4 configuration possible:
GPU OVMF PCI PASSTHROUGH (recommended)
OVMF replace bios by UEFI boot.You need to install your guest OS with uefi support, (for windows, try win >=8)
using OVMF, you can also add disable_vga=1 to vfio-pci module, which try to to opt-out devices from vga arbitration if possible.
and you need to your graphic card have a uefi bootable romhttp://vfio.blogspot.fr/2014/08/does-my-graphics-card-rom-support-efi.html
GPU OVMF PCI EXPRESS PASSTHROUGH
OVMF replace bios by UEFI boot.
You need to install your guest OS with uefi support, (for windows, try win >=8)
and you need to your graphic card have a uefi bootable romhttp://vfio.blogspot.fr/2014/08/does-my-graphics-card-rom-support-efi.html
GPU Seabios PCI PASSTHROUGHGPU Seabios PCI EXPRESS PASSTHROUGHHow to known if card is UEFI (ovmf) compatible
Get and compile the software 'rom-parser'
Then dump the rom of you vga card
and test it with
To be UEFI compatible, you need a 'type 3' in the result.
Nvidia tips
Some applications like geforce experience, Passmark Performance Test and SiSoftware Sandra crash can crash the vm.you need to add:
User have reported that Nvidia Kepler K80 need this in vmid.conf
romfile
Some motherboard can't gpu passthrough on the first pci slot by default because its vbios is shadowed during bootup. So we need to capture its bios when its working 'normally' then when we move the card to slot 1 we can start the vm using the dumped vbios.
to dump the bios
then you can pass the vbios file (must be located in /usr/share/kvm/) with
(romfile option is available in proxmox since january 2017)
BAR 3: can't reserve [mem] error
If you have this error when try to use the card used by the host
you can try to add to grub kernel option:
TroubleshootingSPICE
Spice may give trouble when passing through a GPU as it presents a 'virtual' PCI graphic card to the guest and some drivers have problems with that even when both cards show up.It's always worth a try to disable SPICE and check again if something fails.
Verify Operation
Start the VM from the UI.
Enter the qm monitor. 'qm monitor vmnumber'
Verify that your card is listed here: 'info pci'
Then install drivers on your guest OS.
NOTE: Card support might be limited to 2 or 3 devices.
NOTE: This process will remove the card from the proxmox host OS.
Editorial Note: Using PCI passthrough to present drives direct to a ZFS (FreeNAS, Openfiler, OmniOS) virtual machine is OK for testing, but not recommended for production use. Specific FreeNAS warnings can be found here: http://forums.freenas.org/threads/absolutely-must-virtualize-freenas-a-guide-to-not-completely-losing-your-data.12714/
USB PASSTHROUGH
if you need to passthrough usb devices (keyboard,mouse),please follow this wiki:
Retrieved from 'https://pve.proxmox.com/mediawiki/index.php?title=Pci_passthrough&oldid=10067'
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