OSX-KVM - March 2021 - Batch Update 1

Changes:

- Upgrade to OpenCore 0.6.7-RELEASE

- Big Sur image building script updates (Nick)
  - See https://github.com/kholia/OSX-KVM/pull/169 for details.

- Removed history to reduce repository size

scripts/vfio-ungroup.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# mafferri (https://bbs.archlinux.org)
+
+if [ ! -e /sys/kernel/iommu_groups/$1 ]; then
+	echo "IOMMU group $1 not found"
+	exit 1
+fi
+
+for i in $(ls /sys/kernel/iommu_groups/$1/devices/); do
+	VEN=$(cat /sys/kernel/iommu_groups/$1/devices/$i/vendor)
+	DEV=$(cat /sys/kernel/iommu_groups/$1/devices/$i/device)
+	echo $VEN $DEV | sudo tee \
+		/sys/bus/pci/drivers/vfio-pci/remove_id
+	echo $i | sudo tee \
+		/sys/kernel/iommu_groups/$1/devices/$i/driver/unbind
+done
+
+for i in $(ls /sys/kernel/iommu_groups/$1/devices/); do
+	echo $i | sudo tee /sys/bus/pci/drivers_probe
+done