Add 'tests_install' rule in the Makefile.kvm to auto generate default
testcases for KVM selftests runner. Preserve the hierarchy of test
executables for autogenerated files. Remove these testcases on
invocation of 'make clean'.

Autogeneration of default test files allows runner to execute default
testcases easily. These default testcases don't need to be checked in as
they are just executing the test without any command line options.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 tools/testing/selftests/kvm/.gitignore   |  1 +
 tools/testing/selftests/kvm/Makefile.kvm | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 95af97b1ff9e..548d435bde2f 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -7,6 +7,7 @@
 !*.S
 !*.sh
 !*.test
+default.test
 !.gitignore
 !config
 !settings
diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm
index 41b40c676d7f..6bb63f88c0e6 100644
--- a/tools/testing/selftests/kvm/Makefile.kvm
+++ b/tools/testing/selftests/kvm/Makefile.kvm
@@ -306,11 +306,15 @@ $(SPLIT_TEST_GEN_PROGS): $(OUTPUT)/%: $(OUTPUT)/%.o $(OUTPUT)/$(ARCH)/%.o
 $(SPLIT_TEST_GEN_OBJ): $(OUTPUT)/$(ARCH)/%.o: $(ARCH)/%.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c $< -o $@
 
+# Default testcases for KVM selftests runner will be generated in this directory.
+DEFAULT_TESTCASES = testcases_default_gen
+
 EXTRA_CLEAN += $(GEN_HDRS) \
 	       $(LIBKVM_OBJS) \
 	       $(SPLIT_TEST_GEN_OBJ) \
 	       $(TEST_DEP_FILES) \
 	       $(TEST_GEN_OBJ) \
+	       $(OUTPUT)/$(DEFAULT_TESTCASES) \
 	       cscope.*
 
 $(LIBKVM_C_OBJ): $(OUTPUT)/%.o: %.c $(GEN_HDRS)
@@ -339,3 +343,19 @@ cscope:
 	find . -name '*.c' \
 		-exec realpath --relative-base=$(PWD) {} \;) | sort -u > cscope.files
 	cscope -b
+
+# Generate testcases in DEFAULT_TESTCASES directory.
+# $(OUTPUT) is either CWD or specified in the make command.
+tests_install: list_progs = $(patsubst $(OUTPUT)/%,%,$(TEST_GEN_PROGS))
+tests_install:
+	$(foreach tc, $(TEST_PROGS), \
+		$(shell mkdir -p $(OUTPUT)/$(DEFAULT_TESTCASES)/$(patsubst %.sh,%,$(tc))))
+	$(foreach tc, $(TEST_PROGS), \
+		$(shell echo $(tc) > $(patsubst %.sh,$(OUTPUT)/$(DEFAULT_TESTCASES)/%/default.test,$(tc))))
+
+	$(foreach tc, $(list_progs), \
+		$(shell mkdir -p $(OUTPUT)/$(DEFAULT_TESTCASES)/$(tc)))
+	$(foreach tc, $(list_progs), \
+		$(shell echo $(tc) > $(patsubst %,$(OUTPUT)/$(DEFAULT_TESTCASES)/%/default.test,$(tc))))
+
+	@:
-- 
2.51.0.618.g983fd99d29-goog