iGPU passthrough

[ausghostdog]

What I would like:
Intel quick sync working on VM

What I have :
Virtual Environment 7.3-3
Intel W-1350
Already passed through another PCI-e card, and that is working within a VM
Proxmox is loading with grub https://pve.proxmox.com/wiki/Host_Bootloader


What I have done
1. DMAR: IOMMU enabled

2. grub has iommu=pt intel_iommu=on i915.enable_gvt=1

3.moduels has been set

4. I have updated the initramfs

​

running lspci -v, this appears to be the igpu

lspci -n -s 00:02.0



following https://blog.quindorian.org/2018/03/building-a-2u-amd-ryzen-server-proxmox-gpu-passthrough.html/
I made the driver set to vfio


The issue I have :
I built a test vm

attaching the pci device, I see nothing in drop down on mdev, I have seen other posts where the mdev type is populated, if I try to boot the VM with the pci device attached it boots but I can not ping it or access it in anyway, if I remove the device, it works as normal

What am I missing ?

 

[susannegraf]

Consider the following steps as a resolution pertaining to the Proxmox PCI Passthrough GPU issue:

1) Deselect the Primary GPU setting.

2) Reconfigure your GRUB settings as follows:


GRUB_CMDLINE_LINUX_DEFAULT="quiet pcie_acs_override=downstream,multifunction" GRUB_CMDLINE_LINUX="intel_iommu=on intel_iommu=igfx_off iommu=pt vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1" GRUB_TERMINAL=console


Please ensure that you subsequently update your initramfs with the command:


update-initramfs -u -k all


Also, make sure to update GRUB:


update-grub


Follow these steps with a system reboot.

Here's a note specific to Intel's iGPU:

By default, the gfx device is mapped as a regular device. If a gfx device is equipped with a dedicated DMAR unit, the DMAR unit is bypassed when not enabling DMAR with this particular option. In such a situation, the gfx device will resort to using the physical address for DMA.

Greetings
Susanne

 

[ausghostdog]

Makin g the change

GRUB_CMDLINE_LINUX_DEFAULT="quiet pcie_acs_override=downstream,multifunction"
GRUB_CMDLINE_LINUX="intel_iommu=on intel_iommu=igfx_off iommu=pt vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1"
GRUB_TERMINAL=console

stopped my vms from booting with can not prepare pci pass-throug, iommu not present

change back allowed me to start the vms again.

 

[leesteken]

GRUB_CMDLINE_LINUX="intel_iommu=on intel_iommu=igfx_off iommu=pt vfio_iommu_type1.allow_unsafe_interrupts=1 kvm.ignore_msrs=1"
stopped my vms from booting with can not prepare pci pass-throug, iommu not present

change back allowed me to start the vms again.

intel_iommu=igfx_off excludes the integrated graphics from IOMMU, which would explain what you are seeing.

EDIT: I guess I was wrong about this. Maybe intel_iommu=igfx_off overwrites intel_iommu=on and I mistook it for intel_iommu=on,igfx_off.

 

[ausghostdog]

intel_iommu=igfx_off excludes the integrated graphics from IOMMU, which would explain what you are seeing.

A different VM that is not using the igpu failed to start, I pass it a different pcie device

 

[ausghostdog]

Still working on this, appears I may have made a mistake originally, I have now been able to boot the other VM, but with changes I made when trying to get this to work, I have lost the device group for the cpu

so

gives me

where if I enable the code given I get iommu group as -

 

[ausghostdog]

following https://3os.org/infrastructure/proxmox/gpu-passthrough/igpu-passthrough-to-vm/

I thinking I have this w orking now

 

[distante]

following https://3os.org/infrastructure/proxmox/gpu-passthrough/igpu-passthrough-to-vm/

I thinking I have this w orking now

I do not quite understand this part:

You will loose the ability to use the onboard graphics card to access the Proxmox's console since Proxmox won't be able to use the Intel's gpu

That means I will not be able to directly connect to my machine (cable + keyboard) if something is wrong and I can not ssh to it?