[kvm-unit-tests PATCH v3 1/2] lib: s390x: add header for CMM related defines

[Nico Boehr <nrb@linux.ibm.com>]

Since we're going to need the definitions in an upcoming migration test for CMM,
add a header for CMM related defines. It is based on
arch/s390/include/asm/page-states.h from linux.

While at it, use the constants in existing calls to CMM related functions.

Also move essa() and test_availability() there to be able to use it outside
cmm.c.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 lib/s390x/asm/cmm.h | 50 +++++++++++++++++++++++++++++++++++++++++++++
 s390x/cmm.c         | 25 +++--------------------
 2 files changed, 53 insertions(+), 22 deletions(-)
 create mode 100644 lib/s390x/asm/cmm.h

diff --git a/lib/s390x/asm/cmm.h b/lib/s390x/asm/cmm.h
new file mode 100644
index 000000000000..554a60031fbf
--- /dev/null
+++ b/lib/s390x/asm/cmm.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 2017, 2022
+ *    Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
+ *               Nico Boehr <nrb@linux.ibm.com>
+ */
+#include <asm/interrupt.h>
+
+#ifndef PAGE_STATES_H
+#define PAGE_STATES_H
+
+#define ESSA_GET_STATE			0
+#define ESSA_SET_STABLE			1
+#define ESSA_SET_UNUSED			2
+#define ESSA_SET_VOLATILE		3
+#define ESSA_SET_POT_VOLATILE		4
+#define ESSA_SET_STABLE_RESIDENT	5
+#define ESSA_SET_STABLE_IF_RESIDENT	6
+#define ESSA_SET_STABLE_NODAT		7
+
+#define ESSA_MAX	ESSA_SET_STABLE_NODAT
+
+#define ESSA_USAGE_STABLE		0
+#define ESSA_USAGE_UNUSED		1
+#define ESSA_USAGE_POT_VOLATILE		2
+#define ESSA_USAGE_VOLATILE		3
+
+static unsigned long essa(uint8_t state, unsigned long paddr)
+{
+	uint64_t extr_state;
+
+	asm volatile(".insn rrf,0xb9ab0000,%[extr_state],%[addr],%[new_state],0" \
+			: [extr_state] "=d" (extr_state) \
+			: [addr] "a" (paddr), [new_state] "i" (state));
+
+	return (unsigned long)extr_state;
+}
+
+/*
+ * Unfortunately the availability is not indicated by stfl bits, but
+ * we have to try to execute it and test for an operation exception.
+ */
+static inline bool check_essa_available(void)
+{
+	expect_pgm_int();
+	essa(ESSA_GET_STATE, 0);
+	return clear_pgm_int() == 0;
+}
+
+#endif
diff --git a/s390x/cmm.c b/s390x/cmm.c
index c3f0c931ae36..af852838851e 100644
--- a/s390x/cmm.c
+++ b/s390x/cmm.c
@@ -12,19 +12,10 @@
 #include <asm/asm-offsets.h>
 #include <asm/interrupt.h>
 #include <asm/page.h>
+#include <asm/cmm.h>
 
 static uint8_t pagebuf[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
 
-static unsigned long essa(uint8_t state, unsigned long paddr)
-{
-	uint64_t extr_state;
-
-	asm volatile(".insn rrf,0xb9ab0000,%[extr_state],%[addr],%[new_state],0"
-			: [extr_state] "=d" (extr_state)
-			: [addr] "a" (paddr), [new_state] "i" (state));
-	return (unsigned long)extr_state;
-}
-
 static void test_params(void)
 {
 	report_prefix_push("invalid ORC 8");
@@ -39,24 +30,14 @@ static void test_priv(void)
 	report_prefix_push("privileged");
 	expect_pgm_int();
 	enter_pstate();
-	essa(0, (unsigned long)pagebuf);
+	essa(ESSA_GET_STATE, (unsigned long)pagebuf);
 	check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
 	report_prefix_pop();
 }
 
-/* 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, (unsigned long)pagebuf);
-	return clear_pgm_int() == 0;
-}
-
 int main(void)
 {
-	bool has_essa = test_availability();
+	bool has_essa = check_essa_available();
 
 	report_prefix_push("cmm");
 	if (!has_essa) {
-- 
2.31.1