s390/kvm: Move bitfields for dat tables

Move and improve the struct definitions for DAT tables from gaccess.c
to a new header.

Once in a separate header, the structs become available everywhere. One
possible usecase is to merge them in the s390 pte_t and p?d_t
definitions, which is left as an exercise for the reader.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20240703155900.103783-3-imbrenda@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

1 files changed, 170 insertions, 0 deletions

diff --git a/arch/s390/include/asm/dat-bits.h b/arch/s390/include/asm/dat-bits.h
new file mode 100644
index 000000000000..8d65eec2f124
--- /dev/null
+++ b/arch/s390/include/asm/dat-bits.h
@@ -0,0 +1,170 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * DAT table and related structures
+ *
+ * Copyright IBM Corp. 2024
+ *
+ */
+
+#ifndef _S390_DAT_BITS_H
+#define _S390_DAT_BITS_H
+
+union asce {
+	unsigned long val;
+	struct {
+		unsigned long rsto: 52;/* Region- or Segment-Table Origin */
+		unsigned long	  : 2;
+		unsigned long g   : 1; /* Subspace Group control */
+		unsigned long p   : 1; /* Private Space control */
+		unsigned long s   : 1; /* Storage-Alteration-Event control */
+		unsigned long x   : 1; /* Space-Switch-Event control */
+		unsigned long r   : 1; /* Real-Space control */
+		unsigned long	  : 1;
+		unsigned long dt  : 2; /* Designation-Type control */
+		unsigned long tl  : 2; /* Region- or Segment-Table Length */
+	};
+};
+
+enum {
+	ASCE_TYPE_SEGMENT = 0,
+	ASCE_TYPE_REGION3 = 1,
+	ASCE_TYPE_REGION2 = 2,
+	ASCE_TYPE_REGION1 = 3
+};
+
+union region1_table_entry {
+	unsigned long val;
+	struct {
+		unsigned long rto: 52;/* Region-Table Origin */
+		unsigned long	 : 2;
+		unsigned long p  : 1; /* DAT-Protection Bit */
+		unsigned long	 : 1;
+		unsigned long tf : 2; /* Region-Second-Table Offset */
+		unsigned long i  : 1; /* Region-Invalid Bit */
+		unsigned long	 : 1;
+		unsigned long tt : 2; /* Table-Type Bits */
+		unsigned long tl : 2; /* Region-Second-Table Length */
+	};
+};
+
+union region2_table_entry {
+	unsigned long val;
+	struct {
+		unsigned long rto: 52;/* Region-Table Origin */
+		unsigned long	 : 2;
+		unsigned long p  : 1; /* DAT-Protection Bit */
+		unsigned long	 : 1;
+		unsigned long tf : 2; /* Region-Third-Table Offset */
+		unsigned long i  : 1; /* Region-Invalid Bit */
+		unsigned long	 : 1;
+		unsigned long tt : 2; /* Table-Type Bits */
+		unsigned long tl : 2; /* Region-Third-Table Length */
+	};
+};
+
+struct region3_table_entry_fc0 {
+	unsigned long sto: 52;/* Segment-Table Origin */
+	unsigned long	 : 1;
+	unsigned long fc : 1; /* Format-Control */
+	unsigned long p  : 1; /* DAT-Protection Bit */
+	unsigned long	 : 1;
+	unsigned long tf : 2; /* Segment-Table Offset */
+	unsigned long i  : 1; /* Region-Invalid Bit */
+	unsigned long cr : 1; /* Common-Region Bit */
+	unsigned long tt : 2; /* Table-Type Bits */
+	unsigned long tl : 2; /* Segment-Table Length */
+};
+
+struct region3_table_entry_fc1 {
+	unsigned long rfaa: 33;/* Region-Frame Absolute Address */
+	unsigned long	  : 14;
+	unsigned long av  : 1; /* ACCF-Validity Control */
+	unsigned long acc : 4; /* Access-Control Bits */
+	unsigned long f   : 1; /* Fetch-Protection Bit */
+	unsigned long fc  : 1; /* Format-Control */
+	unsigned long p   : 1; /* DAT-Protection Bit */
+	unsigned long iep : 1; /* Instruction-Execution-Protection */
+	unsigned long	  : 2;
+	unsigned long i   : 1; /* Region-Invalid Bit */
+	unsigned long cr  : 1; /* Common-Region Bit */
+	unsigned long tt  : 2; /* Table-Type Bits */
+	unsigned long	  : 2;
+};
+
+union region3_table_entry {
+	unsigned long val;
+	struct region3_table_entry_fc0 fc0;
+	struct region3_table_entry_fc1 fc1;
+	struct {
+		unsigned long	: 53;
+		unsigned long fc: 1; /* Format-Control */
+		unsigned long	: 4;
+		unsigned long i : 1; /* Region-Invalid Bit */
+		unsigned long cr: 1; /* Common-Region Bit */
+		unsigned long tt: 2; /* Table-Type Bits */
+		unsigned long	: 2;
+	};
+};
+
+struct segment_table_entry_fc0 {
+	unsigned long pto: 53;/* Page-Table Origin */
+	unsigned long fc : 1; /* Format-Control */
+	unsigned long p  : 1; /* DAT-Protection Bit */
+	unsigned long	 : 3;
+	unsigned long i  : 1; /* Segment-Invalid Bit */
+	unsigned long cs : 1; /* Common-Segment Bit */
+	unsigned long tt : 2; /* Table-Type Bits */
+	unsigned long	 : 2;
+};
+
+struct segment_table_entry_fc1 {
+	unsigned long sfaa: 44;/* Segment-Frame Absolute Address */
+	unsigned long	  : 3;
+	unsigned long av  : 1; /* ACCF-Validity Control */
+	unsigned long acc : 4; /* Access-Control Bits */
+	unsigned long f   : 1; /* Fetch-Protection Bit */
+	unsigned long fc  : 1; /* Format-Control */
+	unsigned long p   : 1; /* DAT-Protection Bit */
+	unsigned long iep : 1; /* Instruction-Execution-Protection */
+	unsigned long	  : 2;
+	unsigned long i   : 1; /* Segment-Invalid Bit */
+	unsigned long cs  : 1; /* Common-Segment Bit */
+	unsigned long tt  : 2; /* Table-Type Bits */
+	unsigned long	  : 2;
+};
+
+union segment_table_entry {
+	unsigned long val;
+	struct segment_table_entry_fc0 fc0;
+	struct segment_table_entry_fc1 fc1;
+	struct {
+		unsigned long	: 53;
+		unsigned long fc: 1; /* Format-Control */
+		unsigned long	: 4;
+		unsigned long i : 1; /* Segment-Invalid Bit */
+		unsigned long cs: 1; /* Common-Segment Bit */
+		unsigned long tt: 2; /* Table-Type Bits */
+		unsigned long	: 2;
+	};
+};
+
+union page_table_entry {
+	unsigned long val;
+	struct {
+		unsigned long pfra: 52;/* Page-Frame Real Address */
+		unsigned long z   : 1; /* Zero Bit */
+		unsigned long i   : 1; /* Page-Invalid Bit */
+		unsigned long p   : 1; /* DAT-Protection Bit */
+		unsigned long iep : 1; /* Instruction-Execution-Protection */
+		unsigned long	  : 8;
+	};
+};
+
+enum {
+	TABLE_TYPE_SEGMENT = 0,
+	TABLE_TYPE_REGION3 = 1,
+	TABLE_TYPE_REGION2 = 2,
+	TABLE_TYPE_REGION1 = 3
+};
+
+#endif /* _S390_DAT_BITS_H */