[kvm-unit-tests PATCH v1 7/9] s390x: smp: add tests for CONDITIONAL EMERGENCY

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

Add a test for the conditional emergency signal.

We cover the following cases:
- invalid CPU address. Should lead to the order being rejected.
- the order is accepted and an emergency signal is delivered. We make sure
  this is the case by disabling the CPU's PSW for IO interruptions.

Note we intentionally don't cover the case where the signal isn't
delivered. As per the PoP, implementations are allowed to make the signal
an unconditional one when the condition determination is precluded.

This test is unsupported under PV.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 s390x/smp.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/s390x/smp.c b/s390x/smp.c
index 3bd7e7c8f5ed..9c4e27106aef 100644
--- a/s390x/smp.c
+++ b/s390x/smp.c
@@ -16,6 +16,7 @@
 #include <asm/sigp.h>
 
 #include <smp.h>
+#include <uv.h>
 #include <gs.h>
 #include <alloc_page.h>
 
@@ -604,6 +605,47 @@ static void test_emcall(void)
 	report_prefix_pop();
 }
 
+static void test_cond_emcall(void)
+{
+	uint32_t status = 0;
+	struct psw psw;
+	int cc;
+	psw.mask = extract_psw_mask() & ~PSW_MASK_IO;
+	psw.addr = (unsigned long)emcall;
+
+	report_prefix_push("conditional emergency call");
+
+	if (uv_os_is_guest()) {
+		report_skip("unsupported under PV");
+		goto out;
+	}
+
+	report_prefix_push("invalid CPU address");
+
+	cc = sigp(INVALID_CPU_ADDRESS, SIGP_COND_EMERGENCY_SIGNAL, 0, NULL);
+	report(cc == 3, "CC = 3");
+
+	report_prefix_pop();
+
+	report_prefix_push("success");
+	set_flag(0);
+
+	smp_cpu_start(1, psw);
+	wait_for_flag();
+	set_flag(0);
+	cc = smp_sigp(1, SIGP_COND_EMERGENCY_SIGNAL, 0, &status);
+	report(!cc, "CC = 0");
+
+	wait_for_flag();
+	smp_cpu_stop(1);
+
+	report_prefix_pop();
+
+out:
+	report_prefix_pop();
+
+}
+
 static void test_sense_running(void)
 {
 	report_prefix_push("sense_running");
@@ -731,6 +773,7 @@ int main(void)
 	test_set_prefix();
 	test_ecall();
 	test_emcall();
+	test_cond_emcall();
 	test_sense_running();
 	test_reset();
 	test_reset_initial();
-- 
2.31.1