test/vhost: Separate vhost_json_config from vhost_run

There are upcoming simplifications where it will be
better if these are two separate steps.

Change-Id: I618f947dc314b05a4f94ea98c63fe85539544704
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/461386
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

test/vhost/common.sh

@@ -130,7 +130,6 @@ function vhost_run()
 				vhost_num="${param#*=}"
 				assert_number "$vhost_num"
 				;;
-			--json-path=*) local vhost_json_path="${param#*=}" ;;
 			--memory=*) local memory=${param#*=} ;;
 			--no-pci*) local no_pci="-u" ;;
 			*)
@@ -185,14 +184,19 @@ function vhost_run()
 		 -s $vhost_dir/rpc.sock load_subsystem_config
 	fi
 
-	if [[ -n "$vhost_json_path" ]]; then
-		$rootdir/scripts/rpc.py -s $vhost_dir/rpc.sock load_config < "$vhost_json_path/conf.json"
-	fi
-
 	notice "vhost started - pid=$vhost_pid"
 	timing_exit vhost_start
 }
 
+function vhost_load_config()
+{
+	local vhost_num="$1"
+	local vhost_json_conf="$2"
+	local vhost_dir="$(get_vhost_dir $vhost_num)"
+
+	$rootdir/scripts/rpc.py -s $vhost_dir/rpc.sock load_config < "$vhost_json_conf"
+}
+
 function vhost_kill()
 {
 	local rc=0

test/vhost/fiotest/fio.sh

@@ -81,7 +81,8 @@ if [[ $test_type =~ "spdk_vhost" ]]; then
 	notice ""
 	notice "running SPDK"
 	notice ""
-	vhost_run --json-path=$testdir
+	vhost_run
+	vhost_json_config 0 $testdir/conf.json
 	notice ""
 fi
 

test/vhost/other/negative.sh

@@ -69,7 +69,8 @@ if [[ $RUN_NIGHTLY -eq 1 ]]; then
 	notice ""
 	notice "running SPDK"
 	notice ""
-	vhost_run --json-path=$testdir
+	vhost_run
+	vhost_json_config 0 $testdir/conf.json
 	notice ""
 
 	rpc_py="$rootdir/scripts/rpc.py -s $(get_vhost_dir)/rpc.sock"