[kvm-unit-tests PATCH v2 7/9] s390x: css: msch, enable test

[Pierre Morel <pmorel@linux.ibm.com>]

A second step when testing the channel subsystem is to prepare a channel
for use.

This tests the success of the MSCH instruction by enabling a channel.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
 s390x/css.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/s390x/css.c b/s390x/css.c
index 8186f55..e42dc2f 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -62,11 +62,38 @@ static void test_enumerate(void)
 	return;
 }
 
+static void set_schib(void)
+{
+	struct pmcw *p = &schib.pmcw;
+
+	p->intparm = 0xdeadbeef;
+	p->flags |= PMCW_ENABLE;
+}
+
+static void test_enable(void)
+{
+	int ret;
+
+	if (!test_device_sid) {
+		report_skip("No device");
+		return;
+	}
+	set_schib();
+	dump_schib(&schib);
+
+	ret = msch(test_device_sid, &schib);
+	if (ret)
+		report("msch cc=%d", 0, ret);
+	else
+		report("Tested", 1);
+}
+
 static struct {
 	const char *name;
 	void (*func)(void);
 } tests[] = {
 	{ "enumerate (stsch)", test_enumerate },
+	{ "enable (msch)", test_enable },
 	{ NULL, NULL }
 };
 
-- 
2.17.0