Since 6f6ca067d2 (tests/tcg: add some help output for running
individual tests) we made it easier to run individual tests for a
given architecture. Lets reference that in the developer
documentation.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240729144414.830369-8-alex.bennee@linaro.org>

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index b984c5dd26..af73d3d64f 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -1490,6 +1490,19 @@ And run with::
 Adding ``V=1`` to the invocation will show the details of how to
 invoke QEMU for the test which is useful for debugging tests.
 
+Running individual tests
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Tests can also be run directly from the test build directory. If you
+run ``make help`` from the test build directory you will get a list of
+all the tests that can be run. Please note that same binaries are used
+in multiple tests, for example::
+
+  make run-plugin-test-mmap-with-libinline.so
+
+will run the mmap test with the ``libinline.so`` TCG plugin. The
+gdbstub tests also re-use the test binaries but while exercising gdb.
+
 TCG test dependencies
 ~~~~~~~~~~~~~~~~~~~~~
 
-- 
2.39.2