diff mbox series

[kvm-unit-tests,GIT,PULL,03/13] lib: s390x: uv: Dirty CC before uvc execution

Message ID 20240424105935.184138-4-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.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240131074427.70871-3-frankja@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 lib/s390x/asm/uv.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h
index e9fb19af..611dcd3f 100644
--- a/lib/s390x/asm/uv.h
+++ b/lib/s390x/asm/uv.h
@@ -216,14 +216,16 @@  struct uv_cb_ssc {
 
 static inline int uv_call_once(unsigned long r1, unsigned long r2)
 {
+	uint64_t bogus_cc = 1;
 	int cc;
 
 	asm volatile(
+		"	tmll    %[bogus_cc],3\n"
 		"0:	.insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
 		"		ipm	%[cc]\n"
 		"		srl	%[cc],28\n"
 		: [cc] "=d" (cc)
-		: [r1] "a" (r1), [r2] "a" (r2)
+		: [r1] "a" (r1), [r2] "a" (r2), [bogus_cc] "d" (bogus_cc)
 		: "memory", "cc");
 
 	if (UVC_ERR_DEBUG && cc == 1)