[SOLVED] PCI Passthrough Eth Interface - Lost Management Network

[adam.x.adamek]

Hi,

I have two network cards in my computer. While creating a Synology VM via Proxmox, I mistakenly performed PCI passthrough on the network card that served as the Proxmox management interface. Synology starts up with Proxmox and cuts off my card, so I lost access to Proxmox to change the card. Additionally, I had performed PCI passthrough on the graphics card for Synology to emulate ds918+, so when I connect a monitor to this equipment, I see GRUB and then the console doesn't load. Is there any way to solve my problem?

The second network card has 4 ports, one of which is enabled and connected, and containers like nginx are running on it, and I have SSH access to it. Maybe it can be somehow used to access the Proxmox configuration via the terminal?

 

[leesteken]

Hi,

I have two network cards in my computer. While creating a Synology VM via Proxmox, I mistakenly performed PCI passthrough on the network card that served as the Proxmox management interface. Synology starts up with Proxmox and cuts off my card, so I lost access to Proxmox to change the card. Additionally, I had performed PCI passthrough on the graphics card for Synology to emulate ds918+, so when I connect a monitor to this equipment, I see GRUB and then the console doesn't load. Is there any way to solve my problem?

Maybe disable IOMMU temporarily in BIOS or GRUB/systemd-boot menu to prevent passthrough (VMs from starting)?

The second network card has 4 ports, one of which is enabled and connected, and containers like nginx are running on it, and I have SSH access to it. Maybe it can be somehow used to access the Proxmox configuration via the terminal?

SSH into a container that is connected to the virtual bridge that also has the Proxmox interface connected to it, and then SSH into Proxmox and remove the passthrough (and reboot)?

 

[adam.x.adamek]

Maybe disable IOMMU temporarily in BIOS or GRUB/systemd-boot menu to prevent passthrough (VMs from starting)?

SSH into a container that is connected to the virtual bridge that also has the Proxmox interface connected to it, and then SSH into Proxmox and remove the passthrough (and reboot)?

How can I execute the command you're talking about in GRUB?

 

[leesteken]

How can I execute the command you're talking about in GRUB?

If you can see the menu, press the e key and remove intel_iommu=on or add amd_iommu=off depending on your CPU. But I guess you don't have a display anymore, sorry. Use the motherboard BIOS to disable IOMMU instead.

 

[adam.x.adamek]

The grub menu worked for me. I disabled IOMMU, then entered the virtual machine configuration SynologyVM, edited it by removing the network card that I had previously assigned to it, and recovered everything. Thank you for the guidance. Topic can be closed now.

 

[leesteken]

Topic can be closed now.

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