s390x: sclp: Dirty CC before sclp execution
Dirtying the CC allows us to find missing CC changes when sclp is
emulated.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240131074427.70871-6-frankja@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
diff --git a/s390x/sclp.c b/s390x/sclp.c
index ccbaa91..53fce0c 100644
--- a/s390x/sclp.c
+++ b/s390x/sclp.c
@@ -399,6 +399,7 @@
static void test_instbits(void)
{
SCCBHeader *h = (SCCBHeader *)pagebuf;
+ uint64_t bogus_cc = 1;
int cc;
sclp_mark_busy();
@@ -406,10 +407,12 @@
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
