: ${SPDK_VHOST_VERBOSE=false}
: ${VHOST_DIR="$HOME/vhost_test"}
: ${QEMU_BIN="qemu-system-x86_64"}
: ${QEMU_IMG_BIN="qemu-img"}

TEST_DIR=$(readlink -f $rootdir/..)
VM_DIR=$VHOST_DIR/vms
TARGET_DIR=$VHOST_DIR/vhost
VM_PASSWORD="root"

#TODO: Move vhost_vm_image.qcow2 into VHOST_DIR on test systems.
VM_IMAGE=$HOME/vhost_vm_image.qcow2

if ! hash $QEMU_IMG_BIN $QEMU_BIN; then
	error 'QEMU is not installed on this system. Unable to run vhost tests.'
	exit 1
fi

mkdir -p $VHOST_DIR
mkdir -p $VM_DIR
mkdir -p $TARGET_DIR

#
# Source config describing QEMU and VHOST cores and NUMA
#
source $rootdir/test/vhost/common/autotest.config

function vhosttestinit() {
	if [ "$TEST_MODE" == "iso" ]; then
		$rootdir/scripts/setup.sh

		# Look for the VM image
		if [[ ! -f $VM_IMAGE ]]; then
			echo "VM image not found at $VM_IMAGE"
			echo "Download to $HOME? [yn]"
			read -r download
			if [ "$download" = "y" ]; then
				curl https://ci.spdk.io/download/test_resources/vhost_vm_image.tar.gz | tar xz -C $HOME
			fi
		fi
	fi

	# Look for the VM image
	if [[ ! -f $VM_IMAGE ]]; then
		error "VM image not found at $VM_IMAGE"
		exit 1
	fi
}

function vhosttestfini() {
	if [ "$TEST_MODE" == "iso" ]; then
		$rootdir/scripts/setup.sh reset
	fi
}

function message() {
	local verbose_out
	if ! $SPDK_VHOST_VERBOSE; then
		verbose_out=""
	elif [[ ${FUNCNAME[2]} == "source" ]]; then
		verbose_out=" (file $(basename ${BASH_SOURCE[1]}):${BASH_LINENO[1]})"
	else
		verbose_out=" (function ${FUNCNAME[2]}:${BASH_LINENO[1]})"
	fi

	local msg_type="$1"
	shift
	echo -e "${msg_type}${verbose_out}: $*"
}

function fail() {
	echo "===========" >&2
	message "FAIL" "$@" >&2
	echo "===========" >&2
	exit 1
}

function error() {
	echo "===========" >&2
	message "ERROR" "$@" >&2
	echo "===========" >&2
	# Don't 'return 1' since the stack trace will be incomplete (why?) missing upper command.
	false
}

function warning() {
	message "WARN" "$@" >&2
}

function notice() {
	message "INFO" "$@"
}

function check_qemu_packedring_support() {
	qemu_version=$($QEMU_BIN -version | grep -Po "(?<=version )\d+.\d+.\d+")
	if [[ "$qemu_version" < "4.2.0" ]]; then
		error "This qemu binary does not support packed ring"
	fi
}

function get_vhost_dir() {
	local vhost_name="$1"

	if [[ -z "$vhost_name" ]]; then
		error "vhost name must be provided to get_vhost_dir"
		return 1
	fi

	echo "$TARGET_DIR/${vhost_name}"
}

function vhost_run() {
	local vhost_name="$1"
	local run_gen_nvme=true

	if [[ -z "$vhost_name" ]]; then
		error "vhost name must be provided to vhost_run"
		return 1
	fi
	shift

	if [[ "$1" == "--no-gen-nvme" ]]; then
		notice "Skipping gen_nvmf.sh NVMe bdev configuration"
		run_gen_nvme=false
		shift
	fi

	local vhost_dir
	vhost_dir="$(get_vhost_dir $vhost_name)"
	local vhost_app="$SPDK_BIN_DIR/vhost"
	local vhost_log_file="$vhost_dir/vhost.log"
	local vhost_pid_file="$vhost_dir/vhost.pid"
	local vhost_socket="$vhost_dir/usvhost"
	notice "starting vhost app in background"
	[[ -r "$vhost_pid_file" ]] && vhost_kill $vhost_name
	[[ -d $vhost_dir ]] && rm -f $vhost_dir/*
	mkdir -p $vhost_dir

	if [[ ! -x $vhost_app ]]; then
		error "application not found: $vhost_app"
		return 1
	fi

	local cmd="$vhost_app -r $vhost_dir/rpc.sock $*"

	notice "Loging to:   $vhost_log_file"
	notice "Socket:      $vhost_socket"
	notice "Command:     $cmd"

	timing_enter vhost_start
	cd $vhost_dir
	$cmd &
	vhost_pid=$!
	echo $vhost_pid > $vhost_pid_file

	notice "waiting for app to run..."
	waitforlisten "$vhost_pid" "$vhost_dir/rpc.sock"
	#do not generate nvmes if pci access is disabled
	if [[ "$cmd" != *"--no-pci"* ]] && [[ "$cmd" != *"-u"* ]] && $run_gen_nvme; then
		$rootdir/scripts/gen_nvme.sh "--json" | $rootdir/scripts/rpc.py -s $vhost_dir/rpc.sock load_subsystem_config
	fi

	notice "vhost started - pid=$vhost_pid"
	timing_exit vhost_start
}

function vhost_kill() {
	local rc=0
	local vhost_name="$1"

	if [[ -z "$vhost_name" ]]; then
		error "Must provide vhost name to vhost_kill"
		return 0
	fi

	local vhost_dir
	vhost_dir="$(get_vhost_dir $vhost_name)"
	local vhost_pid_file="$vhost_dir/vhost.pid"

	if [[ ! -r $vhost_pid_file ]]; then
		warning "no vhost pid file found"
		return 0
	fi

	timing_enter vhost_kill
	local vhost_pid
	vhost_pid="$(cat $vhost_pid_file)"
	notice "killing vhost (PID $vhost_pid) app"

	if kill -INT $vhost_pid > /dev/null; then
		notice "sent SIGINT to vhost app - waiting 60 seconds to exit"
		for ((i = 0; i < 60; i++)); do
			if kill -0 $vhost_pid; then
				echo "."
				sleep 1
			else
				break
			fi
		done
		if kill -0 $vhost_pid; then
			error "ERROR: vhost was NOT killed - sending SIGABRT"
			kill -ABRT $vhost_pid
			rm $vhost_pid_file
			rc=1
		else
			while kill -0 $vhost_pid; do
				echo "."
			done
		fi
	elif kill -0 $vhost_pid; then
		error "vhost NOT killed - you need to kill it manually"
		rc=1
	else
		notice "vhost was not running"
	fi

	timing_exit vhost_kill
	if [[ $rc == 0 ]]; then
		rm $vhost_pid_file
	fi

	rm -rf "$vhost_dir"

	return $rc
}

function vhost_rpc() {
	local vhost_name="$1"

	if [[ -z "$vhost_name" ]]; then
		error "vhost name must be provided to vhost_rpc"
		return 1
	fi
	shift

	$rootdir/scripts/rpc.py -s $(get_vhost_dir $vhost_name)/rpc.sock "$@"
}

###
# Mgmt functions
###

function assert_number() {
	[[ "$1" =~ [0-9]+ ]] && return 0

	error "Invalid or missing paramter: need number but got '$1'"
	return 1
}

# Run command on vm with given password
# First argument - vm number
# Second argument - ssh password for vm
#
function vm_sshpass() {
	vm_num_is_valid $1 || return 1

	local ssh_cmd
	ssh_cmd="sshpass -p $2 ssh \
		-o UserKnownHostsFile=/dev/null \
		-o StrictHostKeyChecking=no \
		-o User=root \
		-p $(vm_ssh_socket $1) $VM_SSH_OPTIONS 127.0.0.1"

	shift 2
	$ssh_cmd "$@"
}

# Helper to validate VM number
# param $1 VM number
#
function vm_num_is_valid() {
	[[ "$1" =~ ^[0-9]+$ ]] && return 0

	error "Invalid or missing paramter: vm number '$1'"
	return 1
}

# Print network socket for given VM number
# param $1 virtual machine number
#
function vm_ssh_socket() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"

	cat $vm_dir/ssh_socket
}

function vm_fio_socket() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"

	cat $vm_dir/fio_socket
}

# Execute command on given VM
# param $1 virtual machine number
#
function vm_exec() {
	vm_num_is_valid $1 || return 1

	local vm_num="$1"
	shift

	sshpass -p "$VM_PASSWORD" ssh \
		-o UserKnownHostsFile=/dev/null \
		-o StrictHostKeyChecking=no \
		-o User=root \
		-p $(vm_ssh_socket $vm_num) $VM_SSH_OPTIONS 127.0.0.1 \
		"$@"
}

# Execute scp command on given VM
# param $1 virtual machine number
#
function vm_scp() {
	vm_num_is_valid $1 || return 1

	local vm_num="$1"
	shift

	sshpass -p "$VM_PASSWORD" scp \
		-o UserKnownHostsFile=/dev/null \
		-o StrictHostKeyChecking=no \
		-o User=root \
		-P $(vm_ssh_socket $vm_num) $VM_SSH_OPTIONS \
		"$@"
}

# check if specified VM is running
# param $1 VM num
function vm_is_running() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"

	if [[ ! -r $vm_dir/qemu.pid ]]; then
		return 1
	fi

	local vm_pid
	vm_pid="$(cat $vm_dir/qemu.pid)"

	if /bin/kill -0 $vm_pid; then
		return 0
	else
		if [[ $EUID -ne 0 ]]; then
			warning "not root - assuming VM running since can't be checked"
			return 0
		fi

		# not running - remove pid file
		rm $vm_dir/qemu.pid
		return 1
	fi
}

# check if specified VM is running
# param $1 VM num
function vm_os_booted() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"

	if [[ ! -r $vm_dir/qemu.pid ]]; then
		error "VM $1 is not running"
		return 1
	fi

	if ! VM_SSH_OPTIONS="-o ControlMaster=no" vm_exec $1 "true" 2> /dev/null; then
		# Shutdown existing master. Ignore errors as it might not exist.
		VM_SSH_OPTIONS="-O exit" vm_exec $1 "true" 2> /dev/null
		return 1
	fi

	return 0
}

# Shutdown given VM
# param $1 virtual machine number
# return non-zero in case of error.
function vm_shutdown() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"
	if [[ ! -d "$vm_dir" ]]; then
		error "VM$1 ($vm_dir) not exist - setup it first"
		return 1
	fi

	if ! vm_is_running $1; then
		notice "VM$1 ($vm_dir) is not running"
		return 0
	fi

	# Temporarily disabling exit flag for next ssh command, since it will
	# "fail" due to shutdown
	notice "Shutting down virtual machine $vm_dir"
	set +e
	vm_exec $1 "nohup sh -c 'shutdown -h -P now'" || true
	notice "VM$1 is shutting down - wait a while to complete"
	set -e
}

# Kill given VM
# param $1 virtual machine number
#
function vm_kill() {
	vm_num_is_valid $1 || return 1
	local vm_dir="$VM_DIR/$1"

	if [[ ! -r $vm_dir/qemu.pid ]]; then
		return 0
	fi

	local vm_pid
	vm_pid="$(cat $vm_dir/qemu.pid)"

	notice "Killing virtual machine $vm_dir (pid=$vm_pid)"
	# First kill should fail, second one must fail
	if /bin/kill $vm_pid; then
		notice "process $vm_pid killed"
		rm $vm_dir/qemu.pid
		rm -rf $vm_dir
	elif vm_is_running $1; then
		error "Process $vm_pid NOT killed"
		return 1
	fi
}

# List all VM numbers in VM_DIR
#
function vm_list_all() {
	local vms
	vms="$(
		shopt -s nullglob
		echo $VM_DIR/[0-9]*
	)"
	if [[ -n "$vms" ]]; then
		basename --multiple $vms
	fi
}

# Kills all VM in $VM_DIR
#
function vm_kill_all() {
	local vm
	for vm in $(vm_list_all); do
		vm_kill $vm
	done

	rm -rf $VM_DIR
}

# Shutdown all VM in $VM_DIR
#
function vm_shutdown_all() {
	# XXX: temporarily disable to debug shutdown issue
	# xtrace_disable

	local vms
	vms=$(vm_list_all)
	local vm

	for vm in $vms; do
		vm_shutdown $vm
	done

	notice "Waiting for VMs to shutdown..."
	local timeo=30
	while [[ $timeo -gt 0 ]]; do
		local all_vms_down=1
		for vm in $vms; do
			if vm_is_running $vm; then
				all_vms_down=0
				break
			fi
		done

		if [[ $all_vms_down == 1 ]]; then
			notice "All VMs successfully shut down"
			xtrace_restore
			return 0
		fi

		((timeo -= 1))
		sleep 1
	done

	rm -rf $VM_DIR

	xtrace_restore
}

function vm_setup() {
	xtrace_disable
	local OPTIND optchar vm_num

	local os=""
	local os_mode=""
	local qemu_args=()
	local disk_type_g=NOT_DEFINED
	local read_only="false"
	# List created of a strings separated with a ":"
	local disks=()
	local raw_cache=""
	local vm_incoming=""
	local vm_migrate_to=""
	local force_vm=""
	local guest_memory=1024
	local queue_number=""
	local vhost_dir
	local packed=false
	vhost_dir="$(get_vhost_dir 0)"
	while getopts ':-:' optchar; do
		case "$optchar" in
			-)
				case "$OPTARG" in
					os=*) os="${OPTARG#*=}" ;;
					os-mode=*) os_mode="${OPTARG#*=}" ;;
					qemu-args=*) qemu_args+=("${OPTARG#*=}") ;;
					disk-type=*) disk_type_g="${OPTARG#*=}" ;;
					read-only=*) read_only="${OPTARG#*=}" ;;
					disks=*) IFS=":" read -ra disks <<< "${OPTARG#*=}" ;;
					raw-cache=*) raw_cache=",cache${OPTARG#*=}" ;;
					force=*) force_vm=${OPTARG#*=} ;;
					memory=*) guest_memory=${OPTARG#*=} ;;
					queue_num=*) queue_number=${OPTARG#*=} ;;
					incoming=*) vm_incoming="${OPTARG#*=}" ;;
					migrate-to=*) vm_migrate_to="${OPTARG#*=}" ;;
					vhost-name=*) vhost_dir="$(get_vhost_dir ${OPTARG#*=})" ;;
					spdk-boot=*) local boot_from="${OPTARG#*=}" ;;
					packed) packed=true ;;
					*)
						error "unknown argument $OPTARG"
						return 1
						;;
				esac
				;;
			*)
				error "vm_create Unknown param $OPTARG"
				return 1
				;;
		esac
	done

	# Find next directory we can use
	if [[ -n $force_vm ]]; then
		vm_num=$force_vm

		vm_num_is_valid $vm_num || return 1
		local vm_dir="$VM_DIR/$vm_num"
		[[ -d $vm_dir ]] && warning "removing existing VM in '$vm_dir'"
	else
		local vm_dir=""

		set +x
		for ((i = 0; i <= 256; i++)); do
			local vm_dir="$VM_DIR/$i"
			[[ ! -d $vm_dir ]] && break
		done
		xtrace_restore

		vm_num=$i
	fi

	if [[ $vm_num -eq 256 ]]; then
		error "no free VM found. do some cleanup (256 VMs created, are you insane?)"
		return 1
	fi

	if [[ -n "$vm_migrate_to" && -n "$vm_incoming" ]]; then
		error "'--incoming' and '--migrate-to' cannot be used together"
		return 1
	elif [[ -n "$vm_incoming" ]]; then
		if [[ -n "$os_mode" || -n "$os" ]]; then
			error "'--incoming' can't be used together with '--os' nor '--os-mode'"
			return 1
		fi

		os_mode="original"
		os="$VM_DIR/$vm_incoming/os.qcow2"
	elif [[ -n "$vm_migrate_to" ]]; then
		[[ "$os_mode" != "backing" ]] && warning "Using 'backing' mode for OS since '--migrate-to' is used"
		os_mode=backing
	fi

	notice "Creating new VM in $vm_dir"
	mkdir -p $vm_dir

	if [[ "$os_mode" == "backing" ]]; then
		notice "Creating backing file for OS image file: $os"
		if ! $QEMU_IMG_BIN create -f qcow2 -b $os $vm_dir/os.qcow2; then
			error "Failed to create OS backing file in '$vm_dir/os.qcow2' using '$os'"
			return 1
		fi

		local os=$vm_dir/os.qcow2
	elif [[ "$os_mode" == "original" ]]; then
		warning "Using original OS image file: $os"
	elif [[ "$os_mode" != "snapshot" ]]; then
		if [[ -z "$os_mode" ]]; then
			notice "No '--os-mode' parameter provided - using 'snapshot'"
			os_mode="snapshot"
		else
			error "Invalid '--os-mode=$os_mode'"
			return 1
		fi
	fi

	local qemu_mask_param="VM_${vm_num}_qemu_mask"
	local qemu_numa_node_param="VM_${vm_num}_qemu_numa_node"

	if [[ -z "${!qemu_mask_param}" ]] || [[ -z "${!qemu_numa_node_param}" ]]; then
		error "Parameters ${qemu_mask_param} or ${qemu_numa_node_param} not found in autotest.config file"
		return 1
	fi

	local task_mask=${!qemu_mask_param}

	notice "TASK MASK: $task_mask"
	local cmd=(taskset -a -c "$task_mask" "$QEMU_BIN")
	local vm_socket_offset=$((10000 + 100 * vm_num))

	local ssh_socket=$((vm_socket_offset + 0))
	local fio_socket=$((vm_socket_offset + 1))
	local monitor_port=$((vm_socket_offset + 2))
	local migration_port=$((vm_socket_offset + 3))
	local gdbserver_socket=$((vm_socket_offset + 4))
	local vnc_socket=$((100 + vm_num))
	local qemu_pid_file="$vm_dir/qemu.pid"
	local cpu_num=0

	set +x
	# cpu list for taskset can be comma separated or range
	# or both at the same time, so first split on commas
	cpu_list=$(echo $task_mask | tr "," "\n")
	queue_number=0
	for c in $cpu_list; do
		# if range is detected - count how many cpus
		if [[ $c =~ [0-9]+-[0-9]+ ]]; then
			val=$((c - 1))
			val=${val#-}
		else
			val=1
		fi
		cpu_num=$((cpu_num + val))
		queue_number=$((queue_number + val))
	done

	if [ -z $queue_number ]; then
		queue_number=$cpu_num
	fi

	xtrace_restore

	local node_num=${!qemu_numa_node_param}
	local boot_disk_present=false
	notice "NUMA NODE: $node_num"
	cmd+=(-m "$guest_memory" --enable-kvm -cpu host -smp "$cpu_num" -vga std -vnc ":$vnc_socket" -daemonize)
	cmd+=(-object "memory-backend-file,id=mem,size=${guest_memory}M,mem-path=/dev/hugepages,share=on,prealloc=yes,host-nodes=$node_num,policy=bind")
	[[ $os_mode == snapshot ]] && cmd+=(-snapshot)
	[[ -n "$vm_incoming" ]] && cmd+=(-incoming "tcp:0:$migration_port")
	cmd+=(-monitor "telnet:127.0.0.1:$monitor_port,server,nowait")
	cmd+=(-numa "node,memdev=mem")
	cmd+=(-pidfile "$qemu_pid_file")
	cmd+=(-serial "file:$vm_dir/serial.log")
	cmd+=(-D "$vm_dir/qemu.log")
	cmd+=(-chardev "file,path=$vm_dir/seabios.log,id=seabios" -device "isa-debugcon,iobase=0x402,chardev=seabios")
	cmd+=(-net "user,hostfwd=tcp::$ssh_socket-:22,hostfwd=tcp::$fio_socket-:8765")
	cmd+=(-net nic)
	if [[ -z "$boot_from" ]]; then
		cmd+=(-drive "file=$os,if=none,id=os_disk")
		cmd+=(-device "ide-hd,drive=os_disk,bootindex=0")
	fi

	if ((${#disks[@]} == 0)) && [[ $disk_type_g == virtio* ]]; then
		disks=("default_virtio.img")
	elif ((${#disks[@]} == 0)); then
		error "No disks defined, aborting"
		return 1
	fi

	for disk in "${disks[@]}"; do
		# Each disk can define its type in a form of a disk_name,type. The remaining parts
		# of the string are dropped.
		IFS="," read -r disk disk_type _ <<< "$disk"
		[[ -z $disk_type ]] && disk_type=$disk_type_g

		case $disk_type in
			virtio)
				local raw_name="RAWSCSI"
				local raw_disk=$vm_dir/test.img

				if [[ -n $disk ]]; then
					[[ ! -b $disk ]] && touch $disk
					local raw_disk
					raw_disk=$(readlink -f $disk)
				fi

				# Create disk file if it not exist or it is smaller than 1G
				if { [[ -f $raw_disk ]] && [[ $(stat --printf="%s" $raw_disk) -lt $((1024 * 1024 * 1024)) ]]; } \
					|| [[ ! -e $raw_disk ]]; then
					if [[ $raw_disk =~ /dev/.* ]]; then
						error \
							"ERROR: Virtio disk point to missing device ($raw_disk) -\n" \
							"       this is probably not what you want."
						return 1
					fi

					notice "Creating Virtio disc $raw_disk"
					dd if=/dev/zero of=$raw_disk bs=1024k count=1024
				else
					notice "Using existing image $raw_disk"
				fi

				cmd+=(-device "virtio-scsi-pci,num_queues=$queue_number")
				cmd+=(-device "scsi-hd,drive=hd$i,vendor=$raw_name")
				cmd+=(-drive "if=none,id=hd$i,file=$raw_disk,format=raw$raw_cache")
				;;
			spdk_vhost_scsi)
				notice "using socket $vhost_dir/naa.$disk.$vm_num"
				cmd+=(-chardev "socket,id=char_$disk,path=$vhost_dir/naa.$disk.$vm_num")
				cmd+=(-device "vhost-user-scsi-pci,id=scsi_$disk,num_queues=$queue_number,chardev=char_$disk")
				if [[ "$disk" == "$boot_from" ]]; then
					cmd[-1]+=,bootindex=0
					boot_disk_present=true
				fi
				;;
			spdk_vhost_blk)
				notice "using socket $vhost_dir/naa.$disk.$vm_num"
				cmd+=(-chardev "socket,id=char_$disk,path=$vhost_dir/naa.$disk.$vm_num")
				cmd+=(-device "vhost-user-blk-pci,num-queues=$queue_number,chardev=char_$disk")
				if [[ "$disk" == "$boot_from" ]]; then
					cmd[-1]+=,bootindex=0
					boot_disk_present=true
				fi

				if $packed; then
					check_qemu_packedring_support
					notice "Enabling packed ring support for VM $vm_num, controller $vhost_dir/naa.$disk.$vm_num"
					cmd[-1]+=,packed=on
				fi
				;;
			kernel_vhost)
				if [[ -z $disk ]]; then
					error "need WWN for $disk_type"
					return 1
				elif [[ ! $disk =~ ^[[:alpha:]]{3}[.][[:xdigit:]]+$ ]]; then
					error "$disk_type - disk(wnn)=$disk does not look like WNN number"
					return 1
				fi
				notice "Using kernel vhost disk wwn=$disk"
				cmd+=(-device "vhost-scsi-pci,wwpn=$disk,num_queues=$queue_number")
				;;
			*)
				error "unknown mode '$disk_type', use: virtio, spdk_vhost_scsi, spdk_vhost_blk or kernel_vhost"
				return 1
				;;
		esac
	done

	if [[ -n $boot_from ]] && [[ $boot_disk_present == false ]]; then
		error "Boot from $boot_from is selected but device is not present"
		return 1
	fi

	((${#qemu_args[@]})) && cmd+=("${qemu_args[@]}")
	notice "Saving to $vm_dir/run.sh"
	cat <<- RUN > "$vm_dir/run.sh"
		#!/bin/bash
		qemu_log () {
			echo "=== qemu.log ==="
			[[ -s $vm_dir/qemu.log ]] && cat $vm_dir/qemu.log
			echo "=== qemu.log ==="
		}

		if [[ \$EUID -ne 0 ]]; then
			echo "Go away user come back as root"
			exit 1
		fi

		trap "qemu_log" EXIT

		qemu_cmd=($(printf '%s\n' "${cmd[@]}"))
		chmod +r $vm_dir/*
		echo "Running VM in $vm_dir"
		rm -f $qemu_pid_file
		"\${qemu_cmd[@]}"

		echo "Waiting for QEMU pid file"
		sleep 1
		[[ ! -f $qemu_pid_file ]] && sleep 1
		[[ ! -f $qemu_pid_file ]] && echo "ERROR: no qemu pid file found" && exit 1
		exit 0
		# EOF
	RUN
	chmod +x $vm_dir/run.sh

	# Save generated sockets redirection
	echo $ssh_socket > $vm_dir/ssh_socket
	echo $fio_socket > $vm_dir/fio_socket
	echo $monitor_port > $vm_dir/monitor_port

	rm -f $vm_dir/migration_port
	[[ -z $vm_incoming ]] || echo $migration_port > $vm_dir/migration_port

	echo $gdbserver_socket > $vm_dir/gdbserver_socket
	echo $vnc_socket >> $vm_dir/vnc_socket

	[[ -z $vm_incoming ]] || ln -fs $VM_DIR/$vm_incoming $vm_dir/vm_incoming
	[[ -z $vm_migrate_to ]] || ln -fs $VM_DIR/$vm_migrate_to $vm_dir/vm_migrate_to
}

function vm_run() {
	local OPTIND optchar vm
	local run_all=false
	local vms_to_run=""

	while getopts 'a-:' optchar; do
		case "$optchar" in
			a) run_all=true ;;
			*)
				error "Unknown param $OPTARG"
				return 1
				;;
		esac
	done

	if $run_all; then
		vms_to_run="$(vm_list_all)"
	else
		shift $((OPTIND - 1))
		for vm in "$@"; do
			vm_num_is_valid $1 || return 1
			if [[ ! -x $VM_DIR/$vm/run.sh ]]; then
				error "VM$vm not defined - setup it first"
				return 1
			fi
			vms_to_run+=" $vm"
		done
	fi

	for vm in $vms_to_run; do
		if vm_is_running $vm; then
			warning "VM$vm ($VM_DIR/$vm) already running"
			continue
		fi

		notice "running $VM_DIR/$vm/run.sh"
		if ! $VM_DIR/$vm/run.sh; then
			error "FAILED to run vm $vm"
			return 1
		fi
	done
}

function vm_print_logs() {
	vm_num=$1
	warning "================"
	warning "QEMU LOG:"
	if [[ -r $VM_DIR/$vm_num/qemu.log ]]; then
		cat $VM_DIR/$vm_num/qemu.log
	else
		warning "LOG qemu.log not found"
	fi

	warning "VM LOG:"
	if [[ -r $VM_DIR/$vm_num/serial.log ]]; then
		cat $VM_DIR/$vm_num/serial.log
	else
		warning "LOG serial.log not found"
	fi

	warning "SEABIOS LOG:"
	if [[ -r $VM_DIR/$vm_num/seabios.log ]]; then
		cat $VM_DIR/$vm_num/seabios.log
	else
		warning "LOG seabios.log not found"
	fi
	warning "================"
}

# Wait for all created VMs to boot.
# param $1 max wait time
function vm_wait_for_boot() {
	assert_number $1

	xtrace_disable

	local all_booted=false
	local timeout_time=$1
	[[ $timeout_time -lt 10 ]] && timeout_time=10
	local timeout_time
	timeout_time=$(date -d "+$timeout_time seconds" +%s)

	notice "Waiting for VMs to boot"
	shift
	if [[ "$*" == "" ]]; then
		local vms_to_check="$VM_DIR/[0-9]*"
	else
		local vms_to_check=""
		for vm in "$@"; do
			vms_to_check+=" $VM_DIR/$vm"
		done
	fi

	for vm in $vms_to_check; do
		local vm_num
		vm_num=$(basename $vm)
		local i=0
		notice "waiting for VM$vm_num ($vm)"
		while ! vm_os_booted $vm_num; do
			if ! vm_is_running $vm_num; then
				warning "VM $vm_num is not running"
				vm_print_logs $vm_num
				xtrace_restore
				return 1
			fi

			if [[ $(date +%s) -gt $timeout_time ]]; then
				warning "timeout waiting for machines to boot"
				vm_print_logs $vm_num
				xtrace_restore
				return 1
			fi
			if ((i > 30)); then
				local i=0
				echo
			fi
			echo -n "."
			sleep 1
		done
		echo ""
		notice "VM$vm_num ready"
		#Change Timeout for stopping services to prevent lengthy powerdowns
		#Check that remote system is not Cygwin in case of Windows VMs
		local vm_os
		vm_os=$(vm_exec $vm_num "uname -o")
		if [[ "$vm_os" != "Cygwin" ]]; then
			vm_exec $vm_num "echo 'DefaultTimeoutStopSec=10' >> /etc/systemd/system.conf; systemctl daemon-reexec"
		fi
	done

	notice "all VMs ready"
	xtrace_restore
	return 0
}

function vm_start_fio_server() {
	local OPTIND optchar
	local readonly=''
	local fio_bin=''
	while getopts ':-:' optchar; do
		case "$optchar" in
			-)
				case "$OPTARG" in
					fio-bin=*) local fio_bin="${OPTARG#*=}" ;;
					readonly) local readonly="--readonly" ;;
					*) error "Invalid argument '$OPTARG'" && return 1 ;;
				esac
				;;
			*) error "Invalid argument '$OPTARG'" && return 1 ;;
		esac
	done

	shift $((OPTIND - 1))
	for vm_num in "$@"; do
		notice "Starting fio server on VM$vm_num"
		if [[ $fio_bin != "" ]]; then
			vm_exec $vm_num 'cat > /root/fio; chmod +x /root/fio' < $fio_bin
			vm_exec $vm_num /root/fio $readonly --eta=never --server --daemonize=/root/fio.pid
		else
			vm_exec $vm_num fio $readonly --eta=never --server --daemonize=/root/fio.pid
		fi
	done
}

function vm_check_scsi_location() {
	# Script to find wanted disc
	local script='shopt -s nullglob;
	for entry in /sys/block/sd*; do
		disk_type="$(cat $entry/device/vendor)";
		if [[ $disk_type == INTEL* ]] || [[ $disk_type == RAWSCSI* ]] || [[ $disk_type == LIO-ORG* ]]; then
			fname=$(basename $entry);
			echo -n " $fname";
		fi;
	done'

	SCSI_DISK="$(echo "$script" | vm_exec $1 bash -s)"

	if [[ -z "$SCSI_DISK" ]]; then
		error "no test disk found!"
		return 1
	fi
}

# Note: to use this function your VM should be run with
# appropriate memory and with SPDK source already cloned
# and compiled in /root/spdk.
function vm_check_virtio_location() {
	vm_exec $1 NRHUGE=512 /root/spdk/scripts/setup.sh
	vm_exec $1 "cat > /root/bdev.conf" <<- EOF
		[VirtioPci]
			Enable Yes
	EOF

	vm_exec $1 "cat /root/bdev.conf"

	vm_exec $1 "bash -s" <<- EOF
		set -e
		rootdir="/root/spdk"
		source /root/spdk/test/common/autotest_common.sh
		discover_bdevs /root/spdk /root/bdev.conf | jq -r '[.[].name] | join(" ")' > /root/fio_bdev_filenames
		exit 0
	EOF

	SCSI_DISK=$(vm_exec $1 cat /root/fio_bdev_filenames)
	if [[ -z "$SCSI_DISK" ]]; then
		error "no virtio test disk found!"
		return 1
	fi
}

# Script to perform scsi device reset on all disks in VM
# param $1 VM num
# param $2..$n Disks to perform reset on
function vm_reset_scsi_devices() {
	for disk in "${@:2}"; do
		notice "VM$1 Performing device reset on disk $disk"
		vm_exec $1 sg_reset /dev/$disk -vNd
	done
}

function vm_check_blk_location() {
	local script='shopt -s nullglob; cd /sys/block; echo vd*'
	SCSI_DISK="$(echo "$script" | vm_exec $1 bash -s)"

	if [[ -z "$SCSI_DISK" ]]; then
		error "no blk test disk found!"
		return 1
	fi
}

function run_fio() {
	local arg
	local job_file=""
	local fio_bin=""
	local vms=()
	local out=""
	local vm
	local run_server_mode=true
	local run_plugin_mode=false
	local fio_start_cmd
	local fio_output_format="normal"
	local fio_gtod_reduce=false
	local wait_for_fio=true

	for arg in "$@"; do
		case "$arg" in
			--job-file=*) local job_file="${arg#*=}" ;;
			--fio-bin=*) local fio_bin="${arg#*=}" ;;
			--vm=*) vms+=("${arg#*=}") ;;
			--out=*)
				local out="${arg#*=}"
				mkdir -p $out
				;;
			--local) run_server_mode=false ;;
			--plugin)
				notice "Using plugin mode. Disabling server mode."
				run_plugin_mode=true
				run_server_mode=false
				;;
			--json) fio_output_format="json" ;;
			--hide-results) hide_results=true ;;
			--no-wait-for-fio) wait_for_fio=false ;;
			--gtod-reduce) fio_gtod_reduce=true ;;
			*)
				error "Invalid argument '$arg'"
				return 1
				;;
		esac
	done

	if [[ -n "$fio_bin" && ! -r "$fio_bin" ]]; then
		error "FIO binary '$fio_bin' does not exist"
		return 1
	fi

	if [[ -z "$fio_bin" ]]; then
		fio_bin="fio"
	fi

	if [[ ! -r "$job_file" ]]; then
		error "Fio job '$job_file' does not exist"
		return 1
	fi

	fio_start_cmd="$fio_bin --eta=never "

	local job_fname
	job_fname=$(basename "$job_file")
	log_fname="${job_fname%%.*}.log"
	fio_start_cmd+=" --output=$out/$log_fname --output-format=$fio_output_format "

	# prepare job file for each VM
	for vm in "${vms[@]}"; do
		local vm_num=${vm%%:*}
		local vmdisks=${vm#*:}

		sed "s@filename=@filename=$vmdisks@" $job_file | vm_exec $vm_num "cat > /root/$job_fname"

		if $fio_gtod_reduce; then
			vm_exec $vm_num "echo 'gtod_reduce=1' >> /root/$job_fname"
		fi

		vm_exec $vm_num cat /root/$job_fname

		if $run_server_mode; then
			fio_start_cmd+="--client=127.0.0.1,$(vm_fio_socket $vm_num) --remote-config /root/$job_fname "
		fi

		if ! $run_server_mode; then
			if [[ -n "$fio_bin" ]]; then
				if ! $run_plugin_mode; then
					vm_exec $vm_num 'cat > /root/fio; chmod +x /root/fio' < $fio_bin
					vm_fio_bin="/root/fio"
				else
					vm_fio_bin="/usr/src/fio/fio"
				fi
			fi

			notice "Running local fio on VM $vm_num"
			vm_exec $vm_num "$vm_fio_bin --output=/root/$log_fname --output-format=$fio_output_format /root/$job_fname & echo \$! > /root/fio.pid" &
			vm_exec_pids+=("$!")
		fi
	done

	if ! $run_server_mode; then
		if ! $wait_for_fio; then
			return 0
		fi
		echo "Waiting for guest fio instances to finish.."
		wait "${vm_exec_pids[@]}"

		for vm in "${vms[@]}"; do
			local vm_num=${vm%%:*}
			vm_exec $vm_num cat /root/$log_fname > "$out/vm${vm_num}_${log_fname}"
		done
		return 0
	fi

	$fio_start_cmd
	sleep 1

	if [[ "$fio_output_format" == "json" ]]; then
		# Fio in client-server mode produces a lot of "trash" output
		# preceding JSON structure, making it not possible to parse.
		# Remove these lines from file.
		# shellcheck disable=SC2005
		echo "$(grep -vP '^[<\w]' "$out/$log_fname")" > "$out/$log_fname"
	fi

	if [[ ! $hide_results ]]; then
		cat $out/$log_fname
	fi
}

# Parsing fio results for json output and client-server mode only!
function parse_fio_results() {
	local fio_log_dir=$1
	local fio_log_filename=$2
	local fio_csv_filename

	# Variables used in parsing loop
	local log_file
	local rwmode mixread mixwrite
	local lat_key lat_divisor
	local client_stats iops bw
	local read_avg_lat read_min_lat read_max_lat
	local write_avg_lat write_min_lat write_min_lat

	declare -A results
	results["iops"]=0
	results["bw"]=0
	results["avg_lat"]=0
	results["min_lat"]=0
	results["max_lat"]=0

	# Loop using the log filename to see if there are any other
	# matching files. This is in case we ran fio test multiple times.
	log_files=("$fio_log_dir/$fio_log_filename"*)
	for log_file in "${log_files[@]}"; do
		rwmode=$(jq -r '.["client_stats"][0]["job options"]["rw"]' "$log_file")
		mixread=1
		mixwrite=1
		if [[ $rwmode = *"rw"* ]]; then
			mixread=$(jq -r '.["client_stats"][0]["job options"]["rwmixread"]' "$log_file")
			mixread=$(bc -l <<< "scale=3; $mixread/100")
			mixwrite=$(bc -l <<< "scale=3; 1-$mixread")
		fi

		client_stats=$(jq -r '.["client_stats"][] | select(.jobname == "All clients")' "$log_file")

		# Check latency unit and later normalize to microseconds
		lat_key="lat_us"
		lat_divisor=1
		if jq -er '.read["lat_ns"]' &> /dev/null <<< $client_stats; then
			lat_key="lat_ns"
			lat_divisor=1000
		fi

		# Horrific bash float point arithmetic oprations below.
		# Viewer discretion is advised.
		iops=$(jq -r '[.read["iops"],.write["iops"]] | add' <<< $client_stats)
		bw=$(jq -r '[.read["bw"],.write["bw"]] | add' <<< $client_stats)
		read_avg_lat=$(jq -r --arg lat_key $lat_key '.read[$lat_key]["mean"]' <<< $client_stats)
		read_min_lat=$(jq -r --arg lat_key $lat_key '.read[$lat_key]["min"]' <<< $client_stats)
		read_max_lat=$(jq -r --arg lat_key $lat_key '.read[$lat_key]["max"]' <<< $client_stats)
		write_avg_lat=$(jq -r --arg lat_key $lat_key '.write[$lat_key]["mean"]' <<< $client_stats)
		write_min_lat=$(jq -r --arg lat_key $lat_key '.write[$lat_key]["min"]' <<< $client_stats)
		write_max_lat=$(jq -r --arg lat_key $lat_key '.write[$lat_key]["max"]' <<< $client_stats)

		results["iops"]=$(bc -l <<< "${results[iops]} + $iops")
		results["bw"]=$(bc -l <<< "${results[bw]} + $bw")
		results["avg_lat"]=$(bc -l <<< "${results[avg_lat]} + ($mixread*$read_avg_lat + $mixwrite*$write_avg_lat)/$lat_divisor")
		results["min_lat"]=$(bc -l <<< "${results[min_lat]} + ($mixread*$read_min_lat + $mixwrite*$write_min_lat)/$lat_divisor")
		results["max_lat"]=$(bc -l <<< "${results[max_lat]} + ($mixread*$read_max_lat + $mixwrite*$write_max_lat)/$lat_divisor")
	done

	results["iops"]=$(bc -l <<< "scale=3; ${results[iops]} / ${#log_files[@]}")
	results["bw"]=$(bc -l <<< "scale=3; ${results[bw]} / ${#log_files[@]}")
	results["avg_lat"]=$(bc -l <<< "scale=3; ${results[avg_lat]} / ${#log_files[@]}")
	results["min_lat"]=$(bc -l <<< "scale=3; ${results[min_lat]} / ${#log_files[@]}")
	results["max_lat"]=$(bc -l <<< "scale=3; ${results[max_lat]} / ${#log_files[@]}")

	fio_csv_filename="${fio_log_filename%%.*}.csv"
	cat <<- EOF > "$fio_log_dir/$fio_csv_filename"
		iops,bw,avg_lat,min_lat,max_lat
		${results["iops"]},${results["bw"]},${results["avg_lat"]},${results["min_lat"]},${results["max_lat"]}
	EOF
}

# Shutdown or kill any running VM and SPDK APP.
#
function at_app_exit() {
	local vhost_name

	notice "APP EXITING"
	notice "killing all VMs"
	vm_kill_all
	# Kill vhost application
	notice "killing vhost app"

	for vhost_name in "$TARGET_DIR"/*; do
		vhost_kill $vhost_name
	done

	notice "EXIT DONE"
}

function error_exit() {
	trap - ERR
	print_backtrace
	set +e
	error "Error on $1 $2"

	at_app_exit
	exit 1
}