[kvm-unit-tests PATCH v3] s390x: diag308: Only test subcode 2 under QEMU

Janosch Frank
2022-04-07T13:03:49Z

Other hypervisors might implement it and therefore not send a
specification exception.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
s390x/diag308.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/s390x/diag308.c b/s390x/diag308.c
index c9d6c499..ea41b455 100644
--- a/s390x/diag308.c
+++ b/s390x/diag308.c
@@ -8,6 +8,7 @@
#include <libcflat.h>
#include <asm/asm-offsets.h>
#include <asm/interrupt.h>
+#include <hardware.h>

/* The diagnose calls should be blocked in problem state */
static void test_priv(void)
@@ -75,7 +76,7 @@ static void test_subcode6(void)
/* Unsupported subcodes should generate a specification exception */
static void test_unsupported_subcode(void)
{
- int subcodes[] = { 2, 0x101, 0xffff, 0x10001, -1 };
+ int subcodes[] = { 0x101, 0xffff, 0x10001, -1 };
int idx;

for (idx = 0; idx < ARRAY_SIZE(subcodes); idx++) {
@@ -85,6 +86,21 @@ static void test_unsupported_subcode(void)
check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
report_prefix_pop();
}
+
+ /*
+ * Subcode 2 is not available under QEMU but might be on other
+ * hypervisors so we only check for the specification
+ * exception on QEMU.
+ */
+ report_prefix_pushf("0x%04x", 2);
+ if (host_is_qemu()) {
+ expect_pgm_int();
+ asm volatile ("diag %0,%1,0x308" :: "d"(0), "d"(2));
+ check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+ } else {
+ report_skip("subcode is supported");
+ }
+ report_prefix_pop();
}

static struct {
--
2.32.0