[kvm-unit-tests PATCH v2 5/5] s390x: sclp: Dirty CC before sclp execution

Janosch Frank
2024-01-31T07:44:59Z

Dirtying the CC allows us to find missing CC changes when sclp is
emulated.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
s390x/sclp.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/s390x/sclp.c b/s390x/sclp.c
index ccbaa913..53fce0cf 100644
--- a/s390x/sclp.c
+++ b/s390x/sclp.c
@@ -399,6 +399,7 @@ out:
static void test_instbits(void)
{
SCCBHeader *h = (SCCBHeader *)pagebuf;
+ uint64_t bogus_cc = 1;
int cc;

sclp_mark_busy();
@@ -406,10 +407,12 @@ static void test_instbits(void)
sclp_setup_int();

asm volatile(
+ " tmll %[bogus_cc],3\n"
" .insn rre,0xb2204200,%1,%2\n" /* servc %1,%2 */
" ipm %0\n"
" srl %0,28"
- : "=&d" (cc) : "d" (valid_code), "a" (__pa(pagebuf))
+ : "=&d" (cc)
+ : "d" (valid_code), "a" (__pa(pagebuf)), [bogus_cc] "d" (bogus_cc)
: "cc", "memory");
/* No exception, but also no command accepted, so no interrupt is
* expected. We need to clear the flag manually otherwise we will
--
2.40.1