testimage: Add possibility to pass parmeters to qemu

Add a variable called TEST_QEMUPARAMS in testimage.bbclass to make it
possible to pass parameters to qemu. This can be useful for e.g.
increasing the amount of RAM available during testimage runs.

(From OE-Core rev: 1a9163f5779d233c884c8fd50e0812eabab4fdf3)

Signed-off-by: Erik Botö <erik.boto@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/testimage.bbclass

@@ -31,6 +31,7 @@ TESTIMAGE_AUTO ??= "0"
 # TEST_LOG_DIR contains a command ssh log and may contain infromation about what command is running, output and return codes and for qemu a boot log till login.
 # Booting is handled by this class, and it's not a test in itself.
 # TEST_QEMUBOOT_TIMEOUT can be used to set the maximum time in seconds the launch code will wait for the login prompt.
+# TEST_QEMUPARAMS can be used to pass extra parameters to qemu, e.g. "-m 1024" for setting the amount of ram to 1 GB.
 
 TEST_LOG_DIR ?= "${WORKDIR}/testimage"
 
@@ -63,6 +64,7 @@ TEST_SUITES ?= "${DEFAULT_TEST_SUITES}"
 
 TEST_QEMUBOOT_TIMEOUT ?= "1000"
 TEST_TARGET ?= "qemu"
+TEST_QEMUPARAMS ?= ""
 
 TESTIMAGEDEPENDS = ""
 TESTIMAGEDEPENDS_append_qemuall = " qemu-native:do_populate_sysroot qemu-helper-native:do_populate_sysroot qemu-helper-native:do_addto_recipe_sysroot"
@@ -301,7 +303,8 @@ def testimage_main(d):
     try:
         # We need to check if runqemu ends unexpectedly
         # or if the worker send us a SIGTERM
-        tc.target.start(extra_bootparams=bootparams)
+        tc.target.start(params=d.getVar("TEST_QEMUPARAMS"),
+                        extra_bootparams=bootparams)
         results = tc.runTests()
     except (RuntimeError, BlockingIOError) as err:
         if isinstance(err, RuntimeError):