Description of Changes

On System76 darp11-b and Dell 7330, the Ethernet controller (00:1f.6) is in the same IOMMU group as audio devices (00:1f.0, 00:1f.3, 00:1f.4, 00:1f.5). This prevents passing the Ethernet to netvm while audio goes to audiovm, since VFIO requires entire IOMMU groups. Adding a kernel patch (pcie_acs_override) that overrides ACS capabilities for specific PCI devices by vendor:device ID. This allows devices to be isolated into separate IOMMU groups.

Type of Change

• New Feature
• Bug Fix
• Improvement / Refactor

Related Issues / Tickets

SSRCSP-7725

Checklist

• Clear summary in PR description
• Detailed and meaningful commit message(s)
• Commits are logically organized and squashed if appropriate
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• Author has run make-checks and it passes
• All automatic GitHub Action checks pass - see actions
• Author has added reviewers and removed PR draft status

Testing Instructions

Applicable Targets

• Orin AGX aarch64
• Orin NX aarch64
• Lenovo X1 x86_64
• Dell Latitude 7330 x86_64
• System 76 x86_64

Installation Method

• Requires full re-installation
• Can be updated with nixos-rebuild ... switch
• Other:

Test Steps To Verify:

1. All the VMs must be up and running.
2. audio-vm must only have the ethint0 Ethernet interface (no other Ethernet interfaces present).
3. net-vm must have an eth0 network interface and eth0 has an IP address after connected to the network.
4. Connect to internet through built-in ethernet port (Do not connect wifi)