Gaming on Windows in comfort with PCI passthrough

isolate_cpu.sh

#!/bin/sh

# /etc/libvirt/hooks/qemu.d/windows10/prepare/begin/isolate_cpu.sh

GUEST_NAME="$1"
GUEST_ACTION="$2/$3"
ALLOWED_CPUS="0-7,16-23"
ALL_CPUS="0-31"


# All checks passed, continue
if [[ "$GUEST_ACTION" == "prepare/begin"  ]]; then
  echo "libvirt-qemu cset: Reserving CPUs for VM $GUEST_NAME" > /dev/kmsg 2>&1
  # Allocate CPUs
  systemctl set-property --runtime -- system.slice AllowedCPUs="${ALLOWED_CPUS}"
  systemctl set-property --runtime -- user.slice AllowedCPUs="${ALLOWED_CPUS}"
  systemctl set-property --runtime -- init.scope AllowedCPUs="${ALLOWED_CPUS}"

  # Set CPU Govener
  echo "libvirt-qemu cset: Set CPU governor to performance for VM $GUEST_NAME" > /dev/kmsg 2>&1
  echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

  echo "libvirt-qemu cset: Set ReBar 8GB for VM $GUEST_NAME" > /dev/kmsg 2>&1
  # https://forum.level1techs.com/t/vfio-2023-radeon-7000-edition-wip/199252/1#re-size-bar-complications-6
  rmmod vfio_pci
  echo 13 > /sys/bus/pci/devices/0000:0e:00.0/resource0_resize
  echo 3 > /sys/bus/pci/devices/0000:0e:00.0/resource2_resize
  modprobe vfio_pci
  sleep 2
  lspci -vvvs 0000:0e:00.0 | grep -A 2 "Physical Resizable BAR" | sed -z -e 's/^[ \t ]*//; s/\n//g' | tee /dev/kmsg 2>&1
elif [[ "$GUEST_ACTION" == "release/end"  ]]; then
  echo "libvirt-qemu cset: Releasing CPUs from VM $GUEST_NAME" > /dev/kmsg 2>&1
  # Allocate CPUs
  systemctl set-property --runtime -- system.slice AllowedCPUs="${ALL_CPUS}"
  systemctl set-property --runtime -- user.slice AllowedCPUs="${ALL_CPUS}"
  systemctl set-property --runtime -- init.scope AllowedCPUs="${ALL_CPUS}"

  # Set CPU Govener
  echo "libvirt-qemu cset: Set CPU governor to ondemand for VM $GUEST_NAME" > /dev/kmsg 2>&1
  echo ondemand | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
fi