[kvm-unit-tests PATCH 6/8] s390x: Add cmm tests

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Collaborative Memory Management is the extended vm memory usage
hinting for the hypervisor and handling the ESSA instruction is quite
complicated. Let's add at least a bare-bones test, maybe someone will
extend it later.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
---
 lib/s390x/asm/interrupt.h |  1 +
 lib/s390x/interrupt.c     |  8 ++++++
 s390x/Makefile            |  1 +
 s390x/cmm.c               | 68 +++++++++++++++++++++++++++++++++++++++++++++++
 s390x/unittests.cfg       |  3 +++
 5 files changed, 81 insertions(+)
 create mode 100644 s390x/cmm.c

diff --git a/lib/s390x/asm/interrupt.h b/lib/s390x/asm/interrupt.h
index 3ccc8e3..3f8f2f7 100644
--- a/lib/s390x/asm/interrupt.h
+++ b/lib/s390x/asm/interrupt.h
@@ -15,6 +15,7 @@ void handle_pgm_int(void);
 void expect_pgm_int(void);
 uint16_t clear_pgm_int(void);
 void check_pgm_int_code(uint16_t code);
+uint16_t get_pgm_int_code(void);
 
 /* Activate low-address protection */
 static inline void low_prot_enable(void)
diff --git a/lib/s390x/interrupt.c b/lib/s390x/interrupt.c
index 56c7603..bfa21e8 100644
--- a/lib/s390x/interrupt.c
+++ b/lib/s390x/interrupt.c
@@ -41,6 +41,14 @@ void check_pgm_int_code(uint16_t code)
 	       code == lc->pgm_int_code, code, lc->pgm_int_code);
 }
 
+uint16_t get_pgm_int_code(void)
+{
+	mb();
+	if (!lc->pgm_int_code)
+		pgm_int_expected = false;
+	return lc->pgm_int_code;
+}
+
 static void fixup_pgm_int(void)
 {
 	switch (lc->pgm_int_code) {
diff --git a/s390x/Makefile b/s390x/Makefile
index 438c6b2..e04cad0 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -6,6 +6,7 @@ tests += $(TEST_DIR)/sthyi.elf
 tests += $(TEST_DIR)/skey.elf
 tests += $(TEST_DIR)/diag10.elf
 tests += $(TEST_DIR)/pfmf.elf
+tests += $(TEST_DIR)/cmm.elf
 
 all: directories test_cases
 
diff --git a/s390x/cmm.c b/s390x/cmm.c
new file mode 100644
index 0000000..5f68465
--- /dev/null
+++ b/s390x/cmm.c
@@ -0,0 +1,68 @@
+/*
+ * CMM tests (ESSA)
+ *
+ * Copyright (c) 2017 IBM Corp
+ *
+ * Authors:
+ *  Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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>
+#include <asm/asm-offsets.h>
+#include <asm/interrupt.h>
+#include <asm/page.h>
+
+static uint8_t pagebuf[PAGE_SIZE * 2] __attribute__((aligned(PAGE_SIZE * 2)));
+const unsigned long page0 = (unsigned long)pagebuf;
+
+static unsigned long essa(uint8_t state, unsigned long paddr)
+{
+	register uint64_t addr asm("0") = paddr;
+	register uint64_t extr_state asm("1");
+
+	asm volatile(".insn rrf,0xb9ab0000,%[extr_state],%[addr],%[new_state],0"
+			: [extr_state] "=&d" (extr_state)
+			: [addr] "a" (addr), [new_state] "i" (state));
+	return (unsigned long)extr_state;
+}
+
+static void test_params(void)
+{
+	expect_pgm_int();
+	essa(8, page0);
+	check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+}
+
+static void test_priv(void)
+{
+	expect_pgm_int();
+	enter_pstate();
+	essa(0, page0);
+	check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+}
+
+/* Unfortunately the availability is not indicated by stfl bits, but
+ * we have to try to execute it and test for an operation exception.
+ */
+static bool test_availability(void)
+{
+	expect_pgm_int();
+	essa(0, page0);
+	return get_pgm_int_code() == 0;
+}
+
+int main(void)
+{
+	if (!test_availability()) {
+		printf("ESSA is not available.");
+		return 0;
+	}
+
+	report_prefix_push("cmm");
+	test_priv();
+	test_params();
+	return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 3b975ca..367e970 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -47,3 +47,6 @@ file = diag10.elf
 
 [pfmf]
 file = pfmf.elf
+
+[cmm]
+file = cmm.elf
-- 
2.7.4




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