diff mbox series

[kvm-unit-tests,GIT,PULL,02/13] lib: s390x: sigp: Dirty CC before sigp execution

Message ID 20240424105935.184138-3-nrb@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series [kvm-unit-tests,GIT,PULL,01/13] s390x/Makefile: simplify Secure Execution boot image generation | expand

Commit Message

Nico Boehr April 24, 2024, 10:59 a.m. UTC 
From: Janosch Frank <frankja@linux.ibm.com>

Dirtying the CC allows us to find missing CC changes when sigp 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/20240131074427.70871-2-frankja@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 lib/s390x/asm/sigp.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/lib/s390x/asm/sigp.h b/lib/s390x/asm/sigp.h
index 61d2c625..4eae95d0 100644
--- a/lib/s390x/asm/sigp.h
+++ b/lib/s390x/asm/sigp.h
@@ -49,13 +49,17 @@  static inline int sigp(uint16_t addr, uint8_t order, unsigned long parm,
 		       uint32_t *status)
 {
 	register unsigned long reg1 asm ("1") = parm;
+	uint64_t bogus_cc = SIGP_CC_NOT_OPERATIONAL;
 	int cc;
 
 	asm volatile(
+		"	tmll	%[bogus_cc],3\n"
 		"	sigp	%1,%2,0(%3)\n"
 		"	ipm	%0\n"
 		"	srl	%0,28\n"
-		: "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc");
+		: "=d" (cc), "+d" (reg1)
+		: "d" (addr), "a" (order), [bogus_cc] "d" (bogus_cc)
+		: "cc");
 	if (status)
 		*status = reg1;
 	return cc;