[v3,01/10] s390x: smp: Test all CRs on initial reset

Commit Message

Janosch Frank April 29, 2020, 2:35 p.m. UTC

All CRs are set to 0 and CRs 0 and 14 are set to pre-defined values,
so we also need to test 1-13 and 15 for 0.

And while we're at it, let's also set some values to cr 1, 7 and 13, so
we can actually be sure that they will be zeroed.

Signed-off-by: Janosch Frank <[e-mail]>
Reviewed-by: Cornelia Huck <[e-mail]>
Reviewed-by: Christian Borntraeger <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
---
 s390x/smp.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

Patch

diff --git a/s390x/smp.c b/s390x/smp.c
index fa40753..7144c9b 100644
--- a/s390x/smp.c
+++ b/s390x/smp.c
@@ -182,16 +182,28 @@  static void test_emcall(void)
 	report_prefix_pop();
 }
 
+/* Used to dirty registers of cpu #1 before it is reset */
+static void test_func_initial(void)
+{
+	lctlg(1, 0x42000UL);
+	lctlg(7, 0x43000UL);
+	lctlg(13, 0x44000UL);
+	set_flag(1);
+}
+
 static void test_reset_initial(void)
 {
 	struct cpu_status *status = alloc_pages(0);
 	struct psw psw;
+	int i;
 
 	psw.mask = extract_psw_mask();
-	psw.addr = (unsigned long)test_func;
+	psw.addr = (unsigned long)test_func_initial;
 
 	report_prefix_push("reset initial");
+	set_flag(0);
 	smp_cpu_start(1, psw);
+	wait_for_flag();
 
 	sigp_retry(1, SIGP_INITIAL_CPU_RESET, 0, NULL);
 	sigp(1, SIGP_STORE_STATUS_AT_ADDRESS, (uintptr_t)status, NULL);
@@ -202,6 +214,10 @@  static void test_reset_initial(void)
 	report(!status->fpc, "fpc");
 	report(!status->cputm, "cpu timer");
 	report(!status->todpr, "todpr");
+	for (i = 1; i <= 13; i++) {
+		report(status->crs[i] == 0, "cr%d == 0", i);
+	}
+	report(status->crs[15] == 0, "cr15 == 0");
 	report_prefix_pop();
 
 	report_prefix_push("initialized");