[kvm-unit-tests PATCH v2 6/7] s390x: smp: Test all CRs on initial reset

Janosch Frank
2020-01-16T12:05:38Z

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 <frankja@linux.ibm.com>
---
s390x/smp.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/s390x/smp.c b/s390x/smp.c
index d430638..ce3215d 100644
--- a/s390x/smp.c
+++ b/s390x/smp.c
@@ -176,16 +176,31 @@ 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);
+ testflag = 1;
+ mb();
+ cpu_loop();
+}
+
static void test_reset_initial(void)
{
struct cpu_status *status = alloc_pages(0);
+ uint64_t nullp[12] = {};
struct psw psw;

psw.mask = extract_psw_mask();
- psw.addr = (unsigned long)test_func;
+ psw.addr = (unsigned long)test_func_initial;

report_prefix_push("reset initial");
+ testflag = 0;
+ mb();
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);
@@ -196,6 +211,8 @@ static void test_reset_initial(void)
report(!status->fpc, "fpc");
report(!status->cputm, "cpu timer");
report(!status->todpr, "todpr");
+ report(!memcmp(&status->crs[1], nullp, sizeof(status->crs[1]) * 12), "cr1-13 == 0");
+ report(status->crs[15] == 0, "cr15 == 0");
report_prefix_pop();

report_prefix_push("initialized");
--
2.20.1