[kvm-unit-tests PULL 2/5] s390x: Only look at relevant skey bits

[Thomas Huth <thuth@xxxxxxxxxx>]

From: Janosch Frank <frankja@xxxxxxxxxxxxx>

Reference and change indication should not be consulted when checking
for ACC and FP values of storage keys.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
 lib/s390x/asm/mem.h |  5 +++++
 s390x/pfmf.c        |  6 +++++-
 s390x/skey.c        | 15 +++++++++++----
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/lib/s390x/asm/mem.h b/lib/s390x/asm/mem.h
index 909e6d4..75bd778 100644
--- a/lib/s390x/asm/mem.h
+++ b/lib/s390x/asm/mem.h
@@ -10,6 +10,11 @@
 #ifndef _ASM_S390_MEM_H
 #define _ASM_S390_MEM_H
 
+#define SKEY_ACC	0xf0
+#define SKEY_FP		0x08
+#define SKEY_RF		0x04
+#define SKEY_CH		0x02
+
 union skey {
 	struct {
 		uint8_t acc : 4;
diff --git a/s390x/pfmf.c b/s390x/pfmf.c
index 5e61267..4cc6bd1 100644
--- a/s390x/pfmf.c
+++ b/s390x/pfmf.c
@@ -70,6 +70,7 @@ static void test_4k_key(void)
 	r1.reg.key = 0x30;
 	pfmf(r1.val, (unsigned long) pagebuf);
 	skey.val = get_storage_key((unsigned long) pagebuf);
+	skey.val &= SKEY_ACC | SKEY_FP;
 	report("set 4k", skey.val == 0x30);
 }
 
@@ -77,6 +78,7 @@ static void test_1m_key(void)
 {
 	int i;
 	union r1 r1;
+	union skey skey;
 
 	r1.val = 0;
 	r1.reg.sk = 1;
@@ -84,7 +86,9 @@ static void test_1m_key(void)
 	r1.reg.key = 0x30;
 	pfmf(r1.val, (unsigned long) pagebuf);
 	for (i = 0; i < 256; i++) {
-		if (get_storage_key((unsigned long) pagebuf + i * PAGE_SIZE) != 0x30) {
+		skey.val = get_storage_key((unsigned long) pagebuf + i * PAGE_SIZE);
+		skey.val &= SKEY_ACC | SKEY_FP;
+		if (skey.val != 0x30) {
 			report("set 1M", false);
 			return;
 		}
diff --git a/s390x/skey.c b/s390x/skey.c
index 1949533..f4894f1 100644
--- a/s390x/skey.c
+++ b/s390x/skey.c
@@ -35,9 +35,10 @@ static void test_set_mb(void)
 	while (addr < end)
 		addr = set_storage_key_mb(addr, skey.val);
 
-	ret1.val = get_storage_key(end - PAGE_SIZE);
-	ret2.val = get_storage_key(end - PAGE_SIZE * 2);
-	report("multi block", ret1.val == ret2.val && ret1.val == skey.val);
+	ret1.val = get_storage_key(end - PAGE_SIZE) & (SKEY_ACC | SKEY_FP);
+	ret2.val = get_storage_key(end - PAGE_SIZE * 2) & (SKEY_ACC | SKEY_FP);
+	report("multi block",
+	       ret1.val == ret2.val && ret1.val == skey.val);
 }
 
 static void test_chg(void)
@@ -60,7 +61,13 @@ static void test_set(void)
 	ret.val = get_storage_key(page0);
 	set_storage_key(page0, skey.val, 0);
 	ret.val = get_storage_key(page0);
-	report("set key test", skey.val == ret.val);
+	/*
+	 * For all set tests we only test the ACC and FP bits. RF and
+	 * CH are set by the machine for memory references and changes
+	 * and hence might change between a set and a get.
+	 */
+	report("set key test",
+	       skey.str.acc == ret.str.acc && skey.str.fp == ret.str.fp);
 }
 
 static void test_priv(void)
-- 
1.8.3.1