[kvm-unit-tests PATCH v1 1/5] s390x: add a test case for the ipm + spm instructions

[David Hildenbrand <david@redhat.com>]

Add a new file "emulator.c" and keep running tests simple for now
(no support for multiple iterations and such stuff). We will get this
for free once we switch to a new, general API for running/defining
tests.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 s390x/Makefile      |  1 +
 s390x/emulator.c    | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 s390x/unittests.cfg |  3 +++
 3 files changed, 69 insertions(+)
 create mode 100644 s390x/emulator.c

diff --git a/s390x/Makefile b/s390x/Makefile
index bc099da..573cba2 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -1,5 +1,6 @@
 tests = $(TEST_DIR)/selftest.elf
 tests += $(TEST_DIR)/intercept.elf
+tests += $(TEST_DIR)/emulator.elf
 
 all: directories test_cases
 
diff --git a/s390x/emulator.c b/s390x/emulator.c
new file mode 100644
index 0000000..7854498
--- /dev/null
+++ b/s390x/emulator.c
@@ -0,0 +1,65 @@
+/*
+ * Emulator tests - for s390x CPU instructions that are usually interpreted
+ *                  by the hardware
+ *
+ * Copyright (c) 2017 Red Hat Inc
+ *
+ * Authors:
+ *  David Hildenbrand <david@redhat.com>
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License version 2.
+ */
+#include <libcflat.h>
+
+static inline void __test_spm_ipm(uint8_t cc, uint8_t key)
+{
+	uint64_t in = (cc << 28) | (key << 24);
+	uint64_t out = ~0ULL;
+
+	report_prefix_pushf("cc=%d,key=%x", cc, key);
+
+	asm volatile ("spm %1\n"
+		      "ipm %0\n"
+		      : "+r"(out) : "r"(in) : "cc");
+
+	report("bit 32 and 33 set to zero", !(out & 0xc0000000UL));
+	report("bit 0-31, 40-63 unchanged",
+		(out & ~0xff000000ULL) == ~0xff000000ULL);
+	report("cc and key applied", !((in ^ out) & 0x3f000000UL));
+
+	report_prefix_pop();
+}
+
+/* Test the SET PROGRAM PARAMETER and INSERT PROGRAM PARAMETER instruction */
+static void test_spm_ipm(void)
+{
+	__test_spm_ipm(0, 0xf);
+	__test_spm_ipm(1, 0x9);
+	__test_spm_ipm(2, 0x5);
+	__test_spm_ipm(3, 0x3);
+	__test_spm_ipm(0, 0);
+}
+
+static struct {
+	const char *name;
+	void (*func)(void);
+} tests[] = {
+	{ "spm/ipm", test_spm_ipm },
+	{ NULL, NULL }
+};
+
+int main(int argc, char**argv)
+{
+	int i;
+
+	report_prefix_push("emulator");
+	for (i = 0; tests[i].name; i++) {
+		report_prefix_push(tests[i].name);
+		tests[i].func();
+		report_prefix_pop();
+	}
+	report_prefix_pop();
+
+	return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 3b6b892..1343a19 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -25,3 +25,6 @@ extra_params = -append 'test 123'
 
 [intercept]
 file = intercept.elf
+
+[emulator]
+file = emulator.elf
-- 
2.13.5