s390/mm: move translation-exception identification structure to fault.h

Move translation-exception identification structure to new fault.h
header file, change it to a union, and change existing kvm code
accordingly. The new union will be used by subsequent patches.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

Author: hcahca

arch/s390/include/asm/fault.h

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 1999, 2023
+ */
+#ifndef _ASM_S390_FAULT_H
+#define _ASM_S390_FAULT_H
+
+union teid {
+	unsigned long val;
+	struct {
+		unsigned long addr : 52; /* Translation-exception Address */
+		unsigned long fsi  : 2;	 /* Access Exception Fetch/Store Indication */
+		unsigned long	   : 2;
+		unsigned long b56  : 1;
+		unsigned long	   : 3;
+		unsigned long b60  : 1;
+		unsigned long b61  : 1;
+		unsigned long as   : 2;	 /* ASCE Identifier */
+	};
+};
+
+enum {
+	TEID_FSI_UNKNOWN = 0, /* Unknown whether fetch or store */
+	TEID_FSI_STORE	 = 1, /* Exception was due to store operation */
+	TEID_FSI_FETCH	 = 2  /* Exception was due to fetch operation */
+};
+
+#endif /* _ASM_S390_FAULT_H */

arch/s390/kvm/gaccess.c

@@ -11,7 +11,7 @@
 #include <linux/err.h>
 #include <linux/pgtable.h>
 #include <linux/bitfield.h>
-
+#include <asm/fault.h>
 #include <asm/gmap.h>
 #include "kvm-s390.h"
 #include "gaccess.h"
@@ -466,23 +466,6 @@ static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, u8 ar,
 	return 0;
 }
 
-struct trans_exc_code_bits {
-	unsigned long addr : 52; /* Translation-exception Address */
-	unsigned long fsi  : 2;  /* Access Exception Fetch/Store Indication */
-	unsigned long	   : 2;
-	unsigned long b56  : 1;
-	unsigned long	   : 3;
-	unsigned long b60  : 1;
-	unsigned long b61  : 1;
-	unsigned long as   : 2;  /* ASCE Identifier */
-};
-
-enum {
-	FSI_UNKNOWN = 0, /* Unknown whether fetch or store */
-	FSI_STORE   = 1, /* Exception was due to store operation */
-	FSI_FETCH   = 2  /* Exception was due to fetch operation */
-};
-
 enum prot_type {
 	PROT_TYPE_LA   = 0,
 	PROT_TYPE_KEYC = 1,
@@ -497,11 +480,11 @@ static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva,
 			    enum gacc_mode mode, enum prot_type prot, bool terminate)
 {
 	struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
-	struct trans_exc_code_bits *tec;
+	union teid *teid;
 
 	memset(pgm, 0, sizeof(*pgm));
 	pgm->code = code;
-	tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
+	teid = (union teid *)&pgm->trans_exc_code;
 
 	switch (code) {
 	case PGM_PROTECTION:
@@ -511,25 +494,25 @@ static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva,
 			WARN_ON_ONCE(1);
 			break;
 		case PROT_TYPE_IEP:
-			tec->b61 = 1;
+			teid->b61 = 1;
 			fallthrough;
 		case PROT_TYPE_LA:
-			tec->b56 = 1;
+			teid->b56 = 1;
 			break;
 		case PROT_TYPE_KEYC:
-			tec->b60 = 1;
+			teid->b60 = 1;
 			break;
 		case PROT_TYPE_ALC:
-			tec->b60 = 1;
+			teid->b60 = 1;
 			fallthrough;
 		case PROT_TYPE_DAT:
-			tec->b61 = 1;
+			teid->b61 = 1;
 			break;
 		}
 		if (terminate) {
-			tec->b56 = 0;
-			tec->b60 = 0;
-			tec->b61 = 0;
+			teid->b56 = 0;
+			teid->b60 = 0;
+			teid->b61 = 0;
 		}
 		fallthrough;
 	case PGM_ASCE_TYPE:
@@ -543,9 +526,9 @@ static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva,
 		 * exc_access_id has to be set to 0 for some instructions. Both
 		 * cases have to be handled by the caller.
 		 */
-		tec->addr = gva >> PAGE_SHIFT;
-		tec->fsi = mode == GACC_STORE ? FSI_STORE : FSI_FETCH;
-		tec->as = psw_bits(vcpu->arch.sie_block->gpsw).as;
+		teid->addr = gva >> PAGE_SHIFT;
+		teid->fsi = mode == GACC_STORE ? TEID_FSI_STORE : TEID_FSI_FETCH;
+		teid->as = psw_bits(vcpu->arch.sie_block->gpsw).as;
 		fallthrough;
 	case PGM_ALEN_TRANSLATION:
 	case PGM_ALE_SEQUENCE: