[kvm-unit-tests PATCH v3 1/1] s390x: add migration test for storage keys

Nico Boehr
2022-05-31T08:37:54Z

Upon migration, we expect storage keys set by the guest to be preserved, so add
a test for it.

We keep 128 pages and set predictable storage keys. Then, we migrate and check
that they can be read back and match the value originally set.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
s390x/Makefile | 1 +
s390x/migration-skey.c | 76 ++++++++++++++++++++++++++++++++++++++++++
s390x/unittests.cfg | 4 +++
3 files changed, 81 insertions(+)
create mode 100644 s390x/migration-skey.c

diff --git a/s390x/Makefile b/s390x/Makefile
index 25802428fa13..94fc5c1a3527 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -33,6 +33,7 @@ tests += $(TEST_DIR)/adtl-status.elf
tests += $(TEST_DIR)/migration.elf
tests += $(TEST_DIR)/pv-attest.elf
tests += $(TEST_DIR)/migration-cmm.elf
+tests += $(TEST_DIR)/migration-skey.elf

pv-tests += $(TEST_DIR)/pv-diags.elf

diff --git a/s390x/migration-skey.c b/s390x/migration-skey.c
new file mode 100644
index 000000000000..f846ac435836
--- /dev/null
+++ b/s390x/migration-skey.c
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Storage Key migration tests
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Authors:
+ * Nico Boehr <nrb@linux.ibm.com>
+ */
+
+#include <libcflat.h>
+#include <asm/facility.h>
+#include <asm/page.h>
+#include <asm/mem.h>
+#include <asm/interrupt.h>
+#include <hardware.h>
+
+#define NUM_PAGES 128
+static uint8_t pagebuf[NUM_PAGES][PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
+
+static void test_migration(void)
+{
+ union skey expected_key, actual_key;
+ int i, key_to_set;
+
+ for (i = 0; i < NUM_PAGES; i++) {
+ /*
+ * Storage keys are 7 bit, lowest bit is always returned as zero
+ * by iske
+ */
+ key_to_set = i * 2;
+ set_storage_key(pagebuf[i], key_to_set, 1);
+ }
+
+ puts("Please migrate me, then press return\n");
+ (void)getchar();
+
+ for (i = 0; i < NUM_PAGES; i++) {
+ report_prefix_pushf("page %d", i);
+
+ actual_key.val = get_storage_key(pagebuf[i]);
+ expected_key.val = i * 2;
+
+ /* ignore reference bit */
+ actual_key.str.rf = 0;
+ expected_key.str.rf = 0;
+
+ report(actual_key.val == expected_key.val, "expected_key=0x%x actual_key=0x%x", expected_key.val, actual_key.val);
+
+ report_prefix_pop();
+ }
+}
+
+int main(void)
+{
+ report_prefix_push("migration-skey");
+ if (test_facility(169)) {
+ report_skip("storage key removal facility is active");
+
+ /*
+ * If we just exit and don't ask migrate_cmd to migrate us, it
+ * will just hang forever. Hence, also ask for migration when we
+ * skip this test altogether.
+ */
+ puts("Please migrate me, then press return\n");
+ (void)getchar();
+
+ goto done;
+ }
+
+ test_migration();
+
+done:
+ report_prefix_pop();
+ return report_summary();
+}
diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg
index 9b97d0471bcf..8e52f560bb1e 100644
--- a/s390x/unittests.cfg
+++ b/s390x/unittests.cfg
@@ -180,3 +180,7 @@ smp = 2
[migration-cmm]
file = migration-cmm.elf
groups = migration
+
+[migration-skey]
+file = migration-skey.elf
+groups = migration
--
2.36.1