Libvirt qemu hook

qemu.sh

#!/bin/bash

PINNED=2-7,10-15
UNPINNED=0-1,8-9

if [[ $2 == "start" ]]; then
	echo "Allocating hugepages..."
	#hp 16 || ( echo "Could not allocate hugepages" >&2 && exit 1 )

	echo "Stopping sanoid"
	systemctl stop sanoid.timer

	echo "Isolating cpu set"
	cset shield --kthread=on --cpu=$PINNED
	echo '0' >> /sys/fs/cgroup/cpuset/system/cpuset.cpu_exclusive
	echo '0' >> /sys/fs/cgroup/cpuset/user/cpuset.cpu_exclusive

	echo "Setting min turbo perf to 40"
	echo 40 > /sys/devices/system/cpu/intel_pstate/min_perf_pct
elif [[ $2 == "started" ]]; then
	grep -e vfio  /proc/interrupts | cut -d: -f1 | tr -d ' ' | grep -E '^[0-9]+$' | while read int; do
		echo $PINNED > /proc/irq/$int/smp_affinity_list
	done
	grep -ve vfio /proc/interrupts | cut -d: -f1 | tr -d ' ' | grep -E '^[0-9]+$' | while read int; do
		echo $UNPINNED > /proc/irq/$int/smp_affinity_list || true
	done
	true
elif [[ $2 == "stopped" ]]; then
	cset shield --reset
	cset set -d machine
	systemctl start sanoid.timer
	echo 16 > /sys/devices/system/cpu/intel_pstate/min_perf_pct # 16 was the default
fi