Ventura-AppleVTD-Patch

Patch for macOS 13.3+ to fix WiFi and Ethernet issues when AppleVTD is enabled and system has (a) >16GB memory and (b) supported iGPU enabled

Date	Notice
06 Apr 2023	This patch has been merged into OpenCore as a new kernel quirk named DisableIoMapperMapping. It will be available in May with OpenCore 0.9.2. Details of the quirk can be found here. When the quirk is available and enabled, the patches described below should be disabled or deleted.

Problem:

On some systems such as Z390 Designare and Z490 Vision D, WiFi and Ethernet stopped working with macOS Ventura 13.3. This problem affects all motherboards whose native DMA remap table (DMAR) contains one or more Reserved Memory Regions. Further, this problem occurs only when AppleVTD is enabled and more than 16GB memory is installed.

Solution:

• You may re-enable AppleVTD if you disabled it
• Apply the following patch to config.plist -> Kernel -> patch

An explanation of how the patch was found and what it does is provided here.

Patch Details:

Identifier	com.apple.iokit.IOPCIFamily
Base	__ZN11IOPCIBridge20addBridgeMemoryRangeEyyb
Comment	CaseySJ - Fix AppleVTD issue in 13.3+
Find	4C89F6E8 9AFF0000
Replace	4C89F690 90909090
MinKernel	22.4.0
Count	1
Enabled	True

This patch can be added manually by copying-and-pasting into config.plist. It can also be inserted automatically using OpenCore Configurator¹ as follows:

1. Download patch by clicking green button on upper right of this webpage
2. Mount EFI partition, launch OpenCore Configurator, open your config.plist
3. In OpenCore Configurator navigate to Kernel -> Patch as shown
4. Right-click in the white and gray area to show pop-up menu
5. Choose Import set of patches and select the file CaseySJ-macOS-Ventura-AppleVTD-Patch.plist

The patch will be added to the end of your current set of patches (if any):

Footnotes

1. Warning: Always use the proper version of OpenCore Configurator (OCC)! Each version of OCC supports two versions of OpenCore. Check the OCC title bar (see screenshot above) to see which version of OpenCore is being supported. Do not use a version of OCC that does not support your version of OpenCore! Also make sure that only one EFI partition is mounted when using OpenCore Configurator. ↩