File libica-4.3.0-02-correct-rc-handling-with-s390_pcc-function.patch of Package libica

From d3a7542e7eb45c22066ecb1be62480dde41fd544 Mon Sep 17 00:00:00 2001
From: Joerg Schmidbauer <jschmidb@de.ibm.com>
Date: Wed, 24 Apr 2024 10:44:26 +0200
Subject: [PATCH] Bugfix: correct rc handling with s390_pcc function

Signed-off-by: Joerg Schmidbauer <jschmidb@de.ibm.com>
---
 src/include/s390_aes.h    |  2 +-
 src/include/s390_cmac.h   |  2 +-
 src/include/s390_crypto.h | 23 +++++++++++++----------
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/include/s390_aes.h b/src/include/s390_aes.h
index 6252dde0..a6ff27bd 100644
--- a/src/include/s390_aes.h
+++ b/src/include/s390_aes.h
@@ -674,7 +674,7 @@ static inline int s390_aes_xts_parm(unsigned long function_code,
 
 	memset(&parm_block.keys, 0, key_size);
 
-	if (rc >= 0) {
+	if (rc == 0) {
 		memcpy(xts_parm, parm_block.xts_parameter,
 		       sizeof(ica_aes_vector_t));
 		return 0;
diff --git a/src/include/s390_cmac.h b/src/include/s390_cmac.h
index 76b9cca5..f19c069d 100644
--- a/src/include/s390_cmac.h
+++ b/src/include/s390_cmac.h
@@ -161,7 +161,7 @@ static inline int s390_cmac_hw(unsigned long fc,
 		/* calculate final block (last/full) */
 		rc = s390_pcc(fc, pb_lookup.base);
 		memset(pb_lookup.keys, 0, key_size);
-		if (rc < 0)
+		if (rc != 0)
 			return EIO;
 
 		_stats_increment(fc, ALGO_HW, ENCRYPT);
diff --git a/src/include/s390_crypto.h b/src/include/s390_crypto.h
index f34241fd..f11eacb2 100644
--- a/src/include/s390_crypto.h
+++ b/src/include/s390_crypto.h
@@ -244,27 +244,30 @@ void s390_crypto_switches_init(void);
 
 /**
  * s390_pcc:
- * @func: the function code passed to KM; see s390_pcc_functions
+ * @func: the function code passed to PCC; see s390_pcc_functions
  * @param: address of parameter block; see POP for details on each func
  *
  * Executes the PCC operation of the CPU.
  *
- * Returns -1 for failure, 0 for the query func, number of processed
- * bytes for encryption/decryption funcs
+ * Returns condition code of the PCC instruction
  */
 static inline int s390_pcc(unsigned long func, void *param)
 {
 	register unsigned long r0 asm("0") = (unsigned long)func;
 	register unsigned long r1 asm("1") = (unsigned long)param;
+	char cc;
 
-	asm volatile (
-		"0:	.long	%[opc] << 16\n"
-		"	brc	1,0b\n"
-		:
-		: [fc] "d" (r0), [param] "a" (r1), [opc] "i" (0xb92c)
-		: "cc", "memory");
+	asm volatile(
+		"0:     .insn   rre,%[opc] << 16,0,0\n" /* PCC opcode */
+		"       brc     1,0b\n" /* handle partial completion */
+		"       ipm     %[cc]\n"
+		"       srl     %[cc],28\n"
+		: [cc] "=d" (cc)
+		: [func] "d" (r0), [param] "a" (r1), [opc] "i" (0xb92c)
+		: "cc", "memory"
+	);
 
-	return 0;
+	return cc;
 }
 
 /**