[PATCH kvm-unit-tests v1 7/8] s390x: Add tests for TSCH

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

TSCH has two special cases which need to be tested:

- unaligned address. We test for misalignment by 1 and 2 bytes.
- channel not operational
- bit 47 in SID not set

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
---
 s390x/css.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/s390x/css.c b/s390x/css.c
index 7a0a9ddc28ce..be789c087da1 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -566,6 +566,41 @@ static void test_pmcw_bit5(void)
 	report_prefix_pop();
 }
 
+static void test_tsch(void)
+{
+	const int align_to = 4;
+	struct irb irb;
+	int cc;
+
+	if (!test_device_sid) {
+		report_skip("No device");
+		return;
+	}
+
+	report_prefix_push("Unaligned");
+	for (int i = 1; i < align_to; i *= 2) {
+		report_prefix_pushf("%d", i);
+
+		expect_pgm_int();
+		tsch(test_device_sid, (struct irb *)(alignment_test_page + i));
+		check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+
+		report_prefix_pop();
+	}
+	report_prefix_pop();
+
+	report_prefix_push("Invalid subchannel number");
+	cc = tsch(0x0001ffff, &irb);
+	report(cc == 3, "Channel not operational");
+	report_prefix_pop();
+
+	report_prefix_push("Bit 47 in SID is zero");
+	expect_pgm_int();
+	tsch(0x0000ffff, &irb);
+	check_pgm_int_code(PGM_INT_CODE_OPERAND);
+	report_prefix_pop();
+}
+
 static struct {
 	const char *name;
 	void (*func)(void);
@@ -583,6 +618,7 @@ static struct {
 	{ "ssch", test_ssch },
 	{ "stsch", test_stsch },
 	{ "pmcw bit 5 ignored", test_pmcw_bit5 },
+	{ "tsch", test_tsch },
 	{ NULL, NULL }
 };
 
-- 
2.31.1