Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1872 insertions, 0 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
new file mode 100644
index 0000000000..fb3ee7758b
--- /dev/null
+++ b/arch/s390/include/asm/pgtable.h
@@ -0,0 +1,1872 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  S390 version
+ *    Copyright IBM Corp. 1999, 2000
+ *    Author(s): Hartmut Penner (hp@de.ibm.com)
+ *               Ulrich Weigand (weigand@de.ibm.com)
+ *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/pgtable.h"
+ */
+
+#ifndef _ASM_S390_PGTABLE_H
+#define _ASM_S390_PGTABLE_H
+
+#include <linux/sched.h>
+#include <linux/mm_types.h>
+#include <linux/page-flags.h>
+#include <linux/radix-tree.h>
+#include <linux/atomic.h>
+#include <asm/sections.h>
+#include <asm/bug.h>
+#include <asm/page.h>
+#include <asm/uv.h>
+
+extern pgd_t swapper_pg_dir[];
+extern pgd_t invalid_pg_dir[];
+extern void paging_init(void);
+extern unsigned long s390_invalid_asce;
+
+enum {
+	PG_DIRECT_MAP_4K = 0,
+	PG_DIRECT_MAP_1M,
+	PG_DIRECT_MAP_2G,
+	PG_DIRECT_MAP_MAX
+};
+
+extern atomic_long_t __bootdata_preserved(direct_pages_count[PG_DIRECT_MAP_MAX]);
+
+static inline void update_page_count(int level, long count)
+{
+	if (IS_ENABLED(CONFIG_PROC_FS))
+		atomic_long_add(count, &direct_pages_count[level]);
+}
+
+/*
+ * The S390 doesn't have any external MMU info: the kernel page
+ * tables contain all the necessary information.
+ */
+#define update_mmu_cache(vma, address, ptep)     do { } while (0)
+#define update_mmu_cache_range(vmf, vma, addr, ptep, nr) do { } while (0)
+#define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero; used
+ * for zero-mapped memory areas etc..
+ */
+
+extern unsigned long empty_zero_page;
+extern unsigned long zero_page_mask;
+
+#define ZERO_PAGE(vaddr) \
+	(virt_to_page((void *)(empty_zero_page + \
+	 (((unsigned long)(vaddr)) &zero_page_mask))))
+#define __HAVE_COLOR_ZERO_PAGE
+
+/* TODO: s390 cannot support io_remap_pfn_range... */
+
+#define pte_ERROR(e) \
+	pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pud_ERROR(e) \
+	pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
+#define p4d_ERROR(e) \
+	pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))
+#define pgd_ERROR(e) \
+	pr_err("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * The vmalloc and module area will always be on the topmost area of the
+ * kernel mapping. 512GB are reserved for vmalloc by default.
+ * At the top of the vmalloc area a 2GB area is reserved where modules
+ * will reside. That makes sure that inter module branches always
+ * happen without trampolines and in addition the placement within a
+ * 2GB frame is branch prediction unit friendly.
+ */
+extern unsigned long __bootdata_preserved(VMALLOC_START);
+extern unsigned long __bootdata_preserved(VMALLOC_END);
+#define VMALLOC_DEFAULT_SIZE	((512UL << 30) - MODULES_LEN)
+extern struct page *__bootdata_preserved(vmemmap);
+extern unsigned long __bootdata_preserved(vmemmap_size);
+
+extern unsigned long __bootdata_preserved(MODULES_VADDR);
+extern unsigned long __bootdata_preserved(MODULES_END);
+#define MODULES_VADDR	MODULES_VADDR
+#define MODULES_END	MODULES_END
+#define MODULES_LEN	(1UL << 31)
+
+static inline int is_module_addr(void *addr)
+{
+	BUILD_BUG_ON(MODULES_LEN > (1UL << 31));
+	if (addr < (void *)MODULES_VADDR)
+		return 0;
+	if (addr > (void *)MODULES_END)
+		return 0;
+	return 1;
+}
+
+/*
+ * A 64 bit pagetable entry of S390 has following format:
+ * |			 PFRA			      |0IPC|  OS  |
+ * 0000000000111111111122222222223333333333444444444455555555556666
+ * 0123456789012345678901234567890123456789012345678901234567890123
+ *
+ * I Page-Invalid Bit:    Page is not available for address-translation
+ * P Page-Protection Bit: Store access not possible for page
+ * C Change-bit override: HW is not required to set change bit
+ *
+ * A 64 bit segmenttable entry of S390 has following format:
+ * |        P-table origin                              |      TT
+ * 0000000000111111111122222222223333333333444444444455555555556666
+ * 0123456789012345678901234567890123456789012345678901234567890123
+ *
+ * I Segment-Invalid Bit:    Segment is not available for address-translation
+ * C Common-Segment Bit:     Segment is not private (PoP 3-30)
+ * P Page-Protection Bit: Store access not possible for page
+ * TT Type 00
+ *
+ * A 64 bit region table entry of S390 has following format:
+ * |        S-table origin                             |   TF  TTTL
+ * 0000000000111111111122222222223333333333444444444455555555556666
+ * 0123456789012345678901234567890123456789012345678901234567890123
+ *
+ * I Segment-Invalid Bit:    Segment is not available for address-translation
+ * TT Type 01
+ * TF
+ * TL Table length
+ *
+ * The 64 bit regiontable origin of S390 has following format:
+ * |      region table origon                          |       DTTL
+ * 0000000000111111111122222222223333333333444444444455555555556666
+ * 0123456789012345678901234567890123456789012345678901234567890123
+ *
+ * X Space-Switch event:
+ * G Segment-Invalid Bit:  
+ * P Private-Space Bit:    
+ * S Storage-Alteration:
+ * R Real space
+ * TL Table-Length:
+ *
+ * A storage key has the following format:
+ * | ACC |F|R|C|0|
+ *  0   3 4 5 6 7
+ * ACC: access key
+ * F  : fetch protection bit
+ * R  : referenced bit
+ * C  : changed bit
+ */
+
+/* Hardware bits in the page table entry */
+#define _PAGE_NOEXEC	0x100		/* HW no-execute bit  */
+#define _PAGE_PROTECT	0x200		/* HW read-only bit  */
+#define _PAGE_INVALID	0x400		/* HW invalid bit    */
+#define _PAGE_LARGE	0x800		/* Bit to mark a large pte */
+
+/* Software bits in the page table entry */
+#define _PAGE_PRESENT	0x001		/* SW pte present bit */
+#define _PAGE_YOUNG	0x004		/* SW pte young bit */
+#define _PAGE_DIRTY	0x008		/* SW pte dirty bit */
+#define _PAGE_READ	0x010		/* SW pte read bit */
+#define _PAGE_WRITE	0x020		/* SW pte write bit */
+#define _PAGE_SPECIAL	0x040		/* SW associated with special page */
+#define _PAGE_UNUSED	0x080		/* SW bit for pgste usage state */
+
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define _PAGE_SOFT_DIRTY 0x002		/* SW pte soft dirty bit */
+#else
+#define _PAGE_SOFT_DIRTY 0x000
+#endif
+
+#define _PAGE_SW_BITS	0xffUL		/* All SW bits */
+
+#define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE	/* SW pte exclusive swap bit */
+
+/* Set of bits not changed in pte_modify */
+#define _PAGE_CHG_MASK		(PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
+				 _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
+
+/*
+ * Mask of bits that must not be changed with RDP. Allow only _PAGE_PROTECT
+ * HW bit and all SW bits.
+ */
+#define _PAGE_RDP_MASK		~(_PAGE_PROTECT | _PAGE_SW_BITS)
+
+/*
+ * handle_pte_fault uses pte_present and pte_none to find out the pte type
+ * WITHOUT holding the page table lock. The _PAGE_PRESENT bit is used to
+ * distinguish present from not-present ptes. It is changed only with the page
+ * table lock held.
+ *
+ * The following table gives the different possible bit combinations for
+ * the pte hardware and software bits in the last 12 bits of a pte
+ * (. unassigned bit, x don't care, t swap type):
+ *
+ *				842100000000
+ *				000084210000
+ *				000000008421
+ *				.IR.uswrdy.p
+ * empty			.10.00000000
+ * swap				.11..ttttt.0
+ * prot-none, clean, old	.11.xx0000.1
+ * prot-none, clean, young	.11.xx0001.1
+ * prot-none, dirty, old	.11.xx0010.1
+ * prot-none, dirty, young	.11.xx0011.1
+ * read-only, clean, old	.11.xx0100.1
+ * read-only, clean, young	.01.xx0101.1
+ * read-only, dirty, old	.11.xx0110.1
+ * read-only, dirty, young	.01.xx0111.1
+ * read-write, clean, old	.11.xx1100.1
+ * read-write, clean, young	.01.xx1101.1
+ * read-write, dirty, old	.10.xx1110.1
+ * read-write, dirty, young	.00.xx1111.1
+ * HW-bits: R read-only, I invalid
+ * SW-bits: p present, y young, d dirty, r read, w write, s special,
+ *	    u unused, l large
+ *
+ * pte_none    is true for the bit pattern .10.00000000, pte == 0x400
+ * pte_swap    is true for the bit pattern .11..ooooo.0, (pte & 0x201) == 0x200
+ * pte_present is true for the bit pattern .xx.xxxxxx.1, (pte & 0x001) == 0x001
+ */
+
+/* Bits in the segment/region table address-space-control-element */
+#define _ASCE_ORIGIN		~0xfffUL/* region/segment table origin	    */
+#define _ASCE_PRIVATE_SPACE	0x100	/* private space control	    */
+#define _ASCE_ALT_EVENT		0x80	/* storage alteration event control */
+#define _ASCE_SPACE_SWITCH	0x40	/* space switch event		    */
+#define _ASCE_REAL_SPACE	0x20	/* real space control		    */
+#define _ASCE_TYPE_MASK		0x0c	/* asce table type mask		    */
+#define _ASCE_TYPE_REGION1	0x0c	/* region first table type	    */
+#define _ASCE_TYPE_REGION2	0x08	/* region second table type	    */
+#define _ASCE_TYPE_REGION3	0x04	/* region third table type	    */
+#define _ASCE_TYPE_SEGMENT	0x00	/* segment table type		    */
+#define _ASCE_TABLE_LENGTH	0x03	/* region table length		    */
+
+/* Bits in the region table entry */
+#define _REGION_ENTRY_ORIGIN	~0xfffUL/* region/segment table origin	    */
+#define _REGION_ENTRY_PROTECT	0x200	/* region protection bit	    */
+#define _REGION_ENTRY_NOEXEC	0x100	/* region no-execute bit	    */
+#define _REGION_ENTRY_OFFSET	0xc0	/* region table offset		    */
+#define _REGION_ENTRY_INVALID	0x20	/* invalid region table entry	    */
+#define _REGION_ENTRY_TYPE_MASK	0x0c	/* region table type mask	    */
+#define _REGION_ENTRY_TYPE_R1	0x0c	/* region first table type	    */
+#define _REGION_ENTRY_TYPE_R2	0x08	/* region second table type	    */
+#define _REGION_ENTRY_TYPE_R3	0x04	/* region third table type	    */
+#define _REGION_ENTRY_LENGTH	0x03	/* region third length		    */
+
+#define _REGION1_ENTRY		(_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH)
+#define _REGION1_ENTRY_EMPTY	(_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID)
+#define _REGION2_ENTRY		(_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
+#define _REGION2_ENTRY_EMPTY	(_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID)
+#define _REGION3_ENTRY		(_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
+#define _REGION3_ENTRY_EMPTY	(_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID)
+
+#define _REGION3_ENTRY_ORIGIN_LARGE ~0x7fffffffUL /* large page address	     */
+#define _REGION3_ENTRY_DIRTY	0x2000	/* SW region dirty bit */
+#define _REGION3_ENTRY_YOUNG	0x1000	/* SW region young bit */
+#define _REGION3_ENTRY_LARGE	0x0400	/* RTTE-format control, large page  */
+#define _REGION3_ENTRY_READ	0x0002	/* SW region read bit */
+#define _REGION3_ENTRY_WRITE	0x0001	/* SW region write bit */
+
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define _REGION3_ENTRY_SOFT_DIRTY 0x4000 /* SW region soft dirty bit */
+#else
+#define _REGION3_ENTRY_SOFT_DIRTY 0x0000 /* SW region soft dirty bit */
+#endif
+
+#define _REGION_ENTRY_BITS	 0xfffffffffffff22fUL
+
+/* Bits in the segment table entry */
+#define _SEGMENT_ENTRY_BITS			0xfffffffffffffe33UL
+#define _SEGMENT_ENTRY_HARDWARE_BITS		0xfffffffffffffe30UL
+#define _SEGMENT_ENTRY_HARDWARE_BITS_LARGE	0xfffffffffff00730UL
+#define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address	    */
+#define _SEGMENT_ENTRY_ORIGIN	~0x7ffUL/* page table origin		    */
+#define _SEGMENT_ENTRY_PROTECT	0x200	/* segment protection bit	    */
+#define _SEGMENT_ENTRY_NOEXEC	0x100	/* segment no-execute bit	    */
+#define _SEGMENT_ENTRY_INVALID	0x20	/* invalid segment table entry	    */
+#define _SEGMENT_ENTRY_TYPE_MASK 0x0c	/* segment table type mask	    */
+
+#define _SEGMENT_ENTRY		(0)
+#define _SEGMENT_ENTRY_EMPTY	(_SEGMENT_ENTRY_INVALID)
+
+#define _SEGMENT_ENTRY_DIRTY	0x2000	/* SW segment dirty bit */
+#define _SEGMENT_ENTRY_YOUNG	0x1000	/* SW segment young bit */
+#define _SEGMENT_ENTRY_LARGE	0x0400	/* STE-format control, large page */
+#define _SEGMENT_ENTRY_WRITE	0x0002	/* SW segment write bit */
+#define _SEGMENT_ENTRY_READ	0x0001	/* SW segment read bit */
+
+#ifdef CONFIG_MEM_SOFT_DIRTY
+#define _SEGMENT_ENTRY_SOFT_DIRTY 0x4000 /* SW segment soft dirty bit */
+#else
+#define _SEGMENT_ENTRY_SOFT_DIRTY 0x0000 /* SW segment soft dirty bit */
+#endif
+
+#define _CRST_ENTRIES	2048	/* number of region/segment table entries */
+#define _PAGE_ENTRIES	256	/* number of page table entries	*/
+
+#define _CRST_TABLE_SIZE (_CRST_ENTRIES * 8)
+#define _PAGE_TABLE_SIZE (_PAGE_ENTRIES * 8)
+
+#define _REGION1_SHIFT	53
+#define _REGION2_SHIFT	42
+#define _REGION3_SHIFT	31
+#define _SEGMENT_SHIFT	20
+
+#define _REGION1_INDEX	(0x7ffUL << _REGION1_SHIFT)
+#define _REGION2_INDEX	(0x7ffUL << _REGION2_SHIFT)
+#define _REGION3_INDEX	(0x7ffUL << _REGION3_SHIFT)
+#define _SEGMENT_INDEX	(0x7ffUL << _SEGMENT_SHIFT)
+#define _PAGE_INDEX	(0xffUL  << _PAGE_SHIFT)
+
+#define _REGION1_SIZE	(1UL << _REGION1_SHIFT)
+#define _REGION2_SIZE	(1UL << _REGION2_SHIFT)
+#define _REGION3_SIZE	(1UL << _REGION3_SHIFT)
+#define _SEGMENT_SIZE	(1UL << _SEGMENT_SHIFT)
+
+#define _REGION1_MASK	(~(_REGION1_SIZE - 1))
+#define _REGION2_MASK	(~(_REGION2_SIZE - 1))
+#define _REGION3_MASK	(~(_REGION3_SIZE - 1))
+#define _SEGMENT_MASK	(~(_SEGMENT_SIZE - 1))
+
+#define PMD_SHIFT	_SEGMENT_SHIFT
+#define PUD_SHIFT	_REGION3_SHIFT
+#define P4D_SHIFT	_REGION2_SHIFT
+#define PGDIR_SHIFT	_REGION1_SHIFT
+
+#define PMD_SIZE	_SEGMENT_SIZE
+#define PUD_SIZE	_REGION3_SIZE
+#define P4D_SIZE	_REGION2_SIZE
+#define PGDIR_SIZE	_REGION1_SIZE
+
+#define PMD_MASK	_SEGMENT_MASK
+#define PUD_MASK	_REGION3_MASK
+#define P4D_MASK	_REGION2_MASK
+#define PGDIR_MASK	_REGION1_MASK
+
+#define PTRS_PER_PTE	_PAGE_ENTRIES
+#define PTRS_PER_PMD	_CRST_ENTRIES
+#define PTRS_PER_PUD	_CRST_ENTRIES
+#define PTRS_PER_P4D	_CRST_ENTRIES
+#define PTRS_PER_PGD	_CRST_ENTRIES
+
+/*
+ * Segment table and region3 table entry encoding
+ * (R = read-only, I = invalid, y = young bit):
+ *				dy..R...I...wr
+ * prot-none, clean, old	00..1...1...00
+ * prot-none, clean, young	01..1...1...00
+ * prot-none, dirty, old	10..1...1...00
+ * prot-none, dirty, young	11..1...1...00
+ * read-only, clean, old	00..1...1...01
+ * read-only, clean, young	01..1...0...01
+ * read-only, dirty, old	10..1...1...01
+ * read-only, dirty, young	11..1...0...01
+ * read-write, clean, old	00..1...1...11
+ * read-write, clean, young	01..1...0...11
+ * read-write, dirty, old	10..0...1...11
+ * read-write, dirty, young	11..0...0...11
+ * The segment table origin is used to distinguish empty (origin==0) from
+ * read-write, old segment table entries (origin!=0)
+ * HW-bits: R read-only, I invalid
+ * SW-bits: y young, d dirty, r read, w write
+ */
+
+/* Page status table bits for virtualization */
+#define PGSTE_ACC_BITS	0xf000000000000000UL
+#define PGSTE_FP_BIT	0x0800000000000000UL
+#define PGSTE_PCL_BIT	0x0080000000000000UL
+#define PGSTE_HR_BIT	0x0040000000000000UL
+#define PGSTE_HC_BIT	0x0020000000000000UL
+#define PGSTE_GR_BIT	0x0004000000000000UL
+#define PGSTE_GC_BIT	0x0002000000000000UL
+#define PGSTE_UC_BIT	0x0000800000000000UL	/* user dirty (migration) */
+#define PGSTE_IN_BIT	0x0000400000000000UL	/* IPTE notify bit */
+#define PGSTE_VSIE_BIT	0x0000200000000000UL	/* ref'd in a shadow table */
+
+/* Guest Page State used for virtualization */
+#define _PGSTE_GPS_ZERO			0x0000000080000000UL
+#define _PGSTE_GPS_NODAT		0x0000000040000000UL
+#define _PGSTE_GPS_USAGE_MASK		0x0000000003000000UL
+#define _PGSTE_GPS_USAGE_STABLE		0x0000000000000000UL
+#define _PGSTE_GPS_USAGE_UNUSED		0x0000000001000000UL
+#define _PGSTE_GPS_USAGE_POT_VOLATILE	0x0000000002000000UL
+#define _PGSTE_GPS_USAGE_VOLATILE	_PGSTE_GPS_USAGE_MASK
+
+/*
+ * A user page table pointer has the space-switch-event bit, the
+ * private-space-control bit and the storage-alteration-event-control
+ * bit set. A kernel page table pointer doesn't need them.
+ */
+#define _ASCE_USER_BITS		(_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \
+				 _ASCE_ALT_EVENT)
+
+/*
+ * Page protection definitions.
+ */
+#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_INVALID | _PAGE_PROTECT)
+#define PAGE_RO		__pgprot(_PAGE_PRESENT | _PAGE_READ | \
+				 _PAGE_NOEXEC  | _PAGE_INVALID | _PAGE_PROTECT)
+#define PAGE_RX		__pgprot(_PAGE_PRESENT | _PAGE_READ | \
+				 _PAGE_INVALID | _PAGE_PROTECT)
+#define PAGE_RW		__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+				 _PAGE_NOEXEC  | _PAGE_INVALID | _PAGE_PROTECT)
+#define PAGE_RWX	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+				 _PAGE_INVALID | _PAGE_PROTECT)
+
+#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+				 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC)
+#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+				 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC)
+#define PAGE_KERNEL_RO	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_YOUNG | \
+				 _PAGE_PROTECT | _PAGE_NOEXEC)
+#define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+				  _PAGE_YOUNG |	_PAGE_DIRTY)
+
+/*
+ * On s390 the page table entry has an invalid bit and a read-only bit.
+ * Read permission implies execute permission and write permission
+ * implies read permission.
+ */
+         /*xwr*/
+
+/*
+ * Segment entry (large page) protection definitions.
+ */
+#define SEGMENT_NONE	__pgprot(_SEGMENT_ENTRY_INVALID | \
+				 _SEGMENT_ENTRY_PROTECT)
+#define SEGMENT_RO	__pgprot(_SEGMENT_ENTRY_PROTECT | \
+				 _SEGMENT_ENTRY_READ | \
+				 _SEGMENT_ENTRY_NOEXEC)
+#define SEGMENT_RX	__pgprot(_SEGMENT_ENTRY_PROTECT | \
+				 _SEGMENT_ENTRY_READ)
+#define SEGMENT_RW	__pgprot(_SEGMENT_ENTRY_READ | \
+				 _SEGMENT_ENTRY_WRITE | \
+				 _SEGMENT_ENTRY_NOEXEC)
+#define SEGMENT_RWX	__pgprot(_SEGMENT_ENTRY_READ | \
+				 _SEGMENT_ENTRY_WRITE)
+#define SEGMENT_KERNEL	__pgprot(_SEGMENT_ENTRY |	\
+				 _SEGMENT_ENTRY_LARGE |	\
+				 _SEGMENT_ENTRY_READ |	\
+				 _SEGMENT_ENTRY_WRITE | \
+				 _SEGMENT_ENTRY_YOUNG | \
+				 _SEGMENT_ENTRY_DIRTY | \
+				 _SEGMENT_ENTRY_NOEXEC)
+#define SEGMENT_KERNEL_RO __pgprot(_SEGMENT_ENTRY |	\
+				 _SEGMENT_ENTRY_LARGE |	\
+				 _SEGMENT_ENTRY_READ |	\
+				 _SEGMENT_ENTRY_YOUNG |	\
+				 _SEGMENT_ENTRY_PROTECT | \
+				 _SEGMENT_ENTRY_NOEXEC)
+#define SEGMENT_KERNEL_EXEC __pgprot(_SEGMENT_ENTRY |	\
+				 _SEGMENT_ENTRY_LARGE |	\
+				 _SEGMENT_ENTRY_READ |	\
+				 _SEGMENT_ENTRY_WRITE | \
+				 _SEGMENT_ENTRY_YOUNG |	\
+				 _SEGMENT_ENTRY_DIRTY)
+
+/*
+ * Region3 entry (large page) protection definitions.
+ */
+
+#define REGION3_KERNEL	__pgprot(_REGION_ENTRY_TYPE_R3 | \
+				 _REGION3_ENTRY_LARGE |	 \
+				 _REGION3_ENTRY_READ |	 \
+				 _REGION3_ENTRY_WRITE |	 \
+				 _REGION3_ENTRY_YOUNG |	 \
+				 _REGION3_ENTRY_DIRTY | \
+				 _REGION_ENTRY_NOEXEC)
+#define REGION3_KERNEL_RO __pgprot(_REGION_ENTRY_TYPE_R3 | \
+				   _REGION3_ENTRY_LARGE |  \
+				   _REGION3_ENTRY_READ |   \
+				   _REGION3_ENTRY_YOUNG |  \
+				   _REGION_ENTRY_PROTECT | \
+				   _REGION_ENTRY_NOEXEC)
+#define REGION3_KERNEL_EXEC __pgprot(_REGION_ENTRY_TYPE_R3 | \
+				 _REGION3_ENTRY_LARGE |	 \
+				 _REGION3_ENTRY_READ |	 \
+				 _REGION3_ENTRY_WRITE |	 \
+				 _REGION3_ENTRY_YOUNG |	 \
+				 _REGION3_ENTRY_DIRTY)
+
+static inline bool mm_p4d_folded(struct mm_struct *mm)
+{
+	return mm->context.asce_limit <= _REGION1_SIZE;
+}
+#define mm_p4d_folded(mm) mm_p4d_folded(mm)
+
+static inline bool mm_pud_folded(struct mm_struct *mm)
+{
+	return mm->context.asce_limit <= _REGION2_SIZE;
+}
+#define mm_pud_folded(mm) mm_pud_folded(mm)
+
+static inline bool mm_pmd_folded(struct mm_struct *mm)
+{
+	return mm->context.asce_limit <= _REGION3_SIZE;
+}
+#define mm_pmd_folded(mm) mm_pmd_folded(mm)
+
+static inline int mm_has_pgste(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+	if (unlikely(mm->context.has_pgste))
+		return 1;
+#endif
+	return 0;
+}
+
+static inline int mm_is_protected(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+	if (unlikely(atomic_read(&mm->context.protected_count)))
+		return 1;
+#endif
+	return 0;
+}
+
+static inline int mm_alloc_pgste(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+	if (unlikely(mm->context.alloc_pgste))
+		return 1;
+#endif
+	return 0;
+}
+
+static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
+{
+	return __pte(pte_val(pte) & ~pgprot_val(prot));
+}
+
+static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
+{
+	return __pte(pte_val(pte) | pgprot_val(prot));
+}
+
+static inline pmd_t clear_pmd_bit(pmd_t pmd, pgprot_t prot)
+{
+	return __pmd(pmd_val(pmd) & ~pgprot_val(prot));
+}
+
+static inline pmd_t set_pmd_bit(pmd_t pmd, pgprot_t prot)
+{
+	return __pmd(pmd_val(pmd) | pgprot_val(prot));
+}
+
+static inline pud_t clear_pud_bit(pud_t pud, pgprot_t prot)
+{
+	return __pud(pud_val(pud) & ~pgprot_val(prot));
+}
+
+static inline pud_t set_pud_bit(pud_t pud, pgprot_t prot)
+{
+	return __pud(pud_val(pud) | pgprot_val(prot));
+}
+
+/*
+ * In the case that a guest uses storage keys
+ * faults should no longer be backed by zero pages
+ */
+#define mm_forbids_zeropage mm_has_pgste
+static inline int mm_uses_skeys(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+	if (mm->context.uses_skeys)
+		return 1;
+#endif
+	return 0;
+}
+
+static inline void csp(unsigned int *ptr, unsigned int old, unsigned int new)
+{
+	union register_pair r1 = { .even = old, .odd = new, };
+	unsigned long address = (unsigned long)ptr | 1;
+
+	asm volatile(
+		"	csp	%[r1],%[address]"
+		: [r1] "+&d" (r1.pair), "+m" (*ptr)
+		: [address] "d" (address)
+		: "cc");
+}
+
+static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new)
+{
+	union register_pair r1 = { .even = old, .odd = new, };
+	unsigned long address = (unsigned long)ptr | 1;
+
+	asm volatile(
+		"	cspg	%[r1],%[address]"
+		: [r1] "+&d" (r1.pair), "+m" (*ptr)
+		: [address] "d" (address)
+		: "cc");
+}
+
+#define CRDTE_DTT_PAGE		0x00UL
+#define CRDTE_DTT_SEGMENT	0x10UL
+#define CRDTE_DTT_REGION3	0x14UL
+#define CRDTE_DTT_REGION2	0x18UL
+#define CRDTE_DTT_REGION1	0x1cUL
+
+static inline void crdte(unsigned long old, unsigned long new,
+			 unsigned long *table, unsigned long dtt,
+			 unsigned long address, unsigned long asce)
+{
+	union register_pair r1 = { .even = old, .odd = new, };
+	union register_pair r2 = { .even = __pa(table) | dtt, .odd = address, };
+
+	asm volatile(".insn rrf,0xb98f0000,%[r1],%[r2],%[asce],0"
+		     : [r1] "+&d" (r1.pair)
+		     : [r2] "d" (r2.pair), [asce] "a" (asce)
+		     : "memory", "cc");
+}
+
+/*
+ * pgd/p4d/pud/pmd/pte query functions
+ */
+static inline int pgd_folded(pgd_t pgd)
+{
+	return (pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1;
+}
+
+static inline int pgd_present(pgd_t pgd)
+{
+	if (pgd_folded(pgd))
+		return 1;
+	return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
+}
+
+static inline int pgd_none(pgd_t pgd)
+{
+	if (pgd_folded(pgd))
+		return 0;
+	return (pgd_val(pgd) & _REGION_ENTRY_INVALID) != 0UL;
+}
+
+static inline int pgd_bad(pgd_t pgd)
+{
+	if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1)
+		return 0;
+	return (pgd_val(pgd) & ~_REGION_ENTRY_BITS) != 0;
+}
+
+static inline unsigned long pgd_pfn(pgd_t pgd)
+{
+	unsigned long origin_mask;
+
+	origin_mask = _REGION_ENTRY_ORIGIN;
+	return (pgd_val(pgd) & origin_mask) >> PAGE_SHIFT;
+}
+
+static inline int p4d_folded(p4d_t p4d)
+{
+	return (p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2;
+}
+
+static inline int p4d_present(p4d_t p4d)
+{
+	if (p4d_folded(p4d))
+		return 1;
+	return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL;
+}
+
+static inline int p4d_none(p4d_t p4d)
+{
+	if (p4d_folded(p4d))
+		return 0;
+	return p4d_val(p4d) == _REGION2_ENTRY_EMPTY;
+}
+
+static inline unsigned long p4d_pfn(p4d_t p4d)
+{
+	unsigned long origin_mask;
+
+	origin_mask = _REGION_ENTRY_ORIGIN;
+	return (p4d_val(p4d) & origin_mask) >> PAGE_SHIFT;
+}
+
+static inline int pud_folded(pud_t pud)
+{
+	return (pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3;
+}
+
+static inline int pud_present(pud_t pud)
+{
+	if (pud_folded(pud))
+		return 1;
+	return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
+}
+
+static inline int pud_none(pud_t pud)
+{
+	if (pud_folded(pud))
+		return 0;
+	return pud_val(pud) == _REGION3_ENTRY_EMPTY;
+}
+
+#define pud_leaf	pud_large
+static inline int pud_large(pud_t pud)
+{
+	if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3)
+		return 0;
+	return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);
+}
+
+#define pmd_leaf	pmd_large
+static inline int pmd_large(pmd_t pmd)
+{
+	return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
+}
+
+static inline int pmd_bad(pmd_t pmd)
+{
+	if ((pmd_val(pmd) & _SEGMENT_ENTRY_TYPE_MASK) > 0 || pmd_large(pmd))
+		return 1;
+	return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
+}
+
+static inline int pud_bad(pud_t pud)
+{
+	unsigned long type = pud_val(pud) & _REGION_ENTRY_TYPE_MASK;
+
+	if (type > _REGION_ENTRY_TYPE_R3 || pud_large(pud))
+		return 1;
+	if (type < _REGION_ENTRY_TYPE_R3)
+		return 0;
+	return (pud_val(pud) & ~_REGION_ENTRY_BITS) != 0;
+}
+
+static inline int p4d_bad(p4d_t p4d)
+{
+	unsigned long type = p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK;
+
+	if (type > _REGION_ENTRY_TYPE_R2)
+		return 1;
+	if (type < _REGION_ENTRY_TYPE_R2)
+		return 0;
+	return (p4d_val(p4d) & ~_REGION_ENTRY_BITS) != 0;
+}
+
+static inline int pmd_present(pmd_t pmd)
+{
+	return pmd_val(pmd) != _SEGMENT_ENTRY_EMPTY;
+}
+
+static inline int pmd_none(pmd_t pmd)
+{
+	return pmd_val(pmd) == _SEGMENT_ENTRY_EMPTY;
+}
+
+#define pmd_write pmd_write
+static inline int pmd_write(pmd_t pmd)
+{
+	return (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) != 0;
+}
+
+#define pud_write pud_write
+static inline int pud_write(pud_t pud)
+{
+	return (pud_val(pud) & _REGION3_ENTRY_WRITE) != 0;
+}
+
+static inline int pmd_dirty(pmd_t pmd)
+{
+	return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
+}
+
+#define pmd_young pmd_young
+static inline int pmd_young(pmd_t pmd)
+{
+	return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
+}
+
+static inline int pte_present(pte_t pte)
+{
+	/* Bit pattern: (pte & 0x001) == 0x001 */
+	return (pte_val(pte) & _PAGE_PRESENT) != 0;
+}
+
+static inline int pte_none(pte_t pte)
+{
+	/* Bit pattern: pte == 0x400 */
+	return pte_val(pte) == _PAGE_INVALID;
+}
+
+static inline int pte_swap(pte_t pte)
+{
+	/* Bit pattern: (pte & 0x201) == 0x200 */
+	return (pte_val(pte) & (_PAGE_PROTECT | _PAGE_PRESENT))
+		== _PAGE_PROTECT;
+}
+
+static inline int pte_special(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_SPECIAL);
+}
+
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t a, pte_t b)
+{
+	return pte_val(a) == pte_val(b);
+}
+
+#ifdef CONFIG_NUMA_BALANCING
+static inline int pte_protnone(pte_t pte)
+{
+	return pte_present(pte) && !(pte_val(pte) & _PAGE_READ);
+}
+
+static inline int pmd_protnone(pmd_t pmd)
+{
+	/* pmd_large(pmd) implies pmd_present(pmd) */
+	return pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_READ);
+}
+#endif
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return clear_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline int pte_soft_dirty(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SOFT_DIRTY;
+}
+#define pte_swp_soft_dirty pte_soft_dirty
+
+static inline pte_t pte_mksoft_dirty(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SOFT_DIRTY));
+}
+#define pte_swp_mksoft_dirty pte_mksoft_dirty
+
+static inline pte_t pte_clear_soft_dirty(pte_t pte)
+{
+	return clear_pte_bit(pte, __pgprot(_PAGE_SOFT_DIRTY));
+}
+#define pte_swp_clear_soft_dirty pte_clear_soft_dirty
+
+static inline int pmd_soft_dirty(pmd_t pmd)
+{
+	return pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY;
+}
+
+static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
+{
+	return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY));
+}
+
+static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
+{
+	return clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_SOFT_DIRTY));
+}
+
+/*
+ * query functions pte_write/pte_dirty/pte_young only work if
+ * pte_present() is true. Undefined behaviour if not..
+ */
+static inline int pte_write(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_WRITE) != 0;
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_DIRTY) != 0;
+}
+
+static inline int pte_young(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_YOUNG) != 0;
+}
+
+#define __HAVE_ARCH_PTE_UNUSED
+static inline int pte_unused(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_UNUSED;
+}
+
+/*
+ * Extract the pgprot value from the given pte while at the same time making it
+ * usable for kernel address space mappings where fault driven dirty and
+ * young/old accounting is not supported, i.e _PAGE_PROTECT and _PAGE_INVALID
+ * must not be set.
+ */
+static inline pgprot_t pte_pgprot(pte_t pte)
+{
+	unsigned long pte_flags = pte_val(pte) & _PAGE_CHG_MASK;
+
+	if (pte_write(pte))
+		pte_flags |= pgprot_val(PAGE_KERNEL);
+	else
+		pte_flags |= pgprot_val(PAGE_KERNEL_RO);
+	pte_flags |= pte_val(pte) & mio_wb_bit_mask;
+
+	return __pgprot(pte_flags);
+}
+
+/*
+ * pgd/pmd/pte modification functions
+ */
+
+static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
+{
+	WRITE_ONCE(*pgdp, pgd);
+}
+
+static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
+{
+	WRITE_ONCE(*p4dp, p4d);
+}
+
+static inline void set_pud(pud_t *pudp, pud_t pud)
+{
+	WRITE_ONCE(*pudp, pud);
+}
+
+static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
+{
+	WRITE_ONCE(*pmdp, pmd);
+}
+
+static inline void set_pte(pte_t *ptep, pte_t pte)
+{
+	WRITE_ONCE(*ptep, pte);
+}
+
+static inline void pgd_clear(pgd_t *pgd)
+{
+	if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R1)
+		set_pgd(pgd, __pgd(_REGION1_ENTRY_EMPTY));
+}
+
+static inline void p4d_clear(p4d_t *p4d)
+{
+	if ((p4d_val(*p4d) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
+		set_p4d(p4d, __p4d(_REGION2_ENTRY_EMPTY));
+}
+
+static inline void pud_clear(pud_t *pud)
+{
+	if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
+		set_pud(pud, __pud(_REGION3_ENTRY_EMPTY));
+}
+
+static inline void pmd_clear(pmd_t *pmdp)
+{
+	set_pmd(pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
+}
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	set_pte(ptep, __pte(_PAGE_INVALID));
+}
+
+/*
+ * The following pte modification functions only work if
+ * pte_present() is true. Undefined behaviour if not..
+ */
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+	pte = clear_pte_bit(pte, __pgprot(~_PAGE_CHG_MASK));
+	pte = set_pte_bit(pte, newprot);
+	/*
+	 * newprot for PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX
+	 * has the invalid bit set, clear it again for readable, young pages
+	 */
+	if ((pte_val(pte) & _PAGE_YOUNG) && (pte_val(pte) & _PAGE_READ))
+		pte = clear_pte_bit(pte, __pgprot(_PAGE_INVALID));
+	/*
+	 * newprot for PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX has the page
+	 * protection bit set, clear it again for writable, dirty pages
+	 */
+	if ((pte_val(pte) & _PAGE_DIRTY) && (pte_val(pte) & _PAGE_WRITE))
+		pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT));
+	return pte;
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	pte = clear_pte_bit(pte, __pgprot(_PAGE_WRITE));
+	return set_pte_bit(pte, __pgprot(_PAGE_PROTECT));
+}
+
+static inline pte_t pte_mkwrite_novma(pte_t pte)
+{
+	pte = set_pte_bit(pte, __pgprot(_PAGE_WRITE));
+	if (pte_val(pte) & _PAGE_DIRTY)
+		pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT));
+	return pte;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	pte = clear_pte_bit(pte, __pgprot(_PAGE_DIRTY));
+	return set_pte_bit(pte, __pgprot(_PAGE_PROTECT));
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+	pte = set_pte_bit(pte, __pgprot(_PAGE_DIRTY | _PAGE_SOFT_DIRTY));
+	if (pte_val(pte) & _PAGE_WRITE)
+		pte = clear_pte_bit(pte, __pgprot(_PAGE_PROTECT));
+	return pte;
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+	pte = clear_pte_bit(pte, __pgprot(_PAGE_YOUNG));
+	return set_pte_bit(pte, __pgprot(_PAGE_INVALID));
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+	pte = set_pte_bit(pte, __pgprot(_PAGE_YOUNG));
+	if (pte_val(pte) & _PAGE_READ)
+		pte = clear_pte_bit(pte, __pgprot(_PAGE_INVALID));
+	return pte;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SPECIAL));
+}
+
+#ifdef CONFIG_HUGETLB_PAGE
+static inline pte_t pte_mkhuge(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_LARGE));
+}
+#endif
+
+#define IPTE_GLOBAL	0
+#define	IPTE_LOCAL	1
+
+#define IPTE_NODAT	0x400
+#define IPTE_GUEST_ASCE	0x800
+
+static __always_inline void __ptep_rdp(unsigned long addr, pte_t *ptep,
+				       unsigned long opt, unsigned long asce,
+				       int local)
+{
+	unsigned long pto;
+
+	pto = __pa(ptep) & ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
+	asm volatile(".insn rrf,0xb98b0000,%[r1],%[r2],%[asce],%[m4]"
+		     : "+m" (*ptep)
+		     : [r1] "a" (pto), [r2] "a" ((addr & PAGE_MASK) | opt),
+		       [asce] "a" (asce), [m4] "i" (local));
+}
+
+static __always_inline void __ptep_ipte(unsigned long address, pte_t *ptep,
+					unsigned long opt, unsigned long asce,
+					int local)
+{
+	unsigned long pto = __pa(ptep);
+
+	if (__builtin_constant_p(opt) && opt == 0) {
+		/* Invalidation + TLB flush for the pte */
+		asm volatile(
+			"	ipte	%[r1],%[r2],0,%[m4]"
+			: "+m" (*ptep) : [r1] "a" (pto), [r2] "a" (address),
+			  [m4] "i" (local));
+		return;
+	}
+
+	/* Invalidate ptes with options + TLB flush of the ptes */
+	opt = opt | (asce & _ASCE_ORIGIN);
+	asm volatile(
+		"	ipte	%[r1],%[r2],%[r3],%[m4]"
+		: [r2] "+a" (address), [r3] "+a" (opt)
+		: [r1] "a" (pto), [m4] "i" (local) : "memory");
+}
+
+static __always_inline void __ptep_ipte_range(unsigned long address, int nr,
+					      pte_t *ptep, int local)
+{
+	unsigned long pto = __pa(ptep);
+
+	/* Invalidate a range of ptes + TLB flush of the ptes */
+	do {
+		asm volatile(
+			"	ipte %[r1],%[r2],%[r3],%[m4]"
+			: [r2] "+a" (address), [r3] "+a" (nr)
+			: [r1] "a" (pto), [m4] "i" (local) : "memory");
+	} while (nr != 255);
+}
+
+/*
+ * This is hard to understand. ptep_get_and_clear and ptep_clear_flush
+ * both clear the TLB for the unmapped pte. The reason is that
+ * ptep_get_and_clear is used in common code (e.g. change_pte_range)
+ * to modify an active pte. The sequence is
+ *   1) ptep_get_and_clear
+ *   2) set_pte_at
+ *   3) flush_tlb_range
+ * On s390 the tlb needs to get flushed with the modification of the pte
+ * if the pte is active. The only way how this can be implemented is to
+ * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range
+ * is a nop.
+ */
+pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t);
+pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t);
+
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
+					    unsigned long addr, pte_t *ptep)
+{
+	pte_t pte = *ptep;
+
+	pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte));
+	return pte_young(pte);
+}
+
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
+					 unsigned long address, pte_t *ptep)
+{
+	return ptep_test_and_clear_young(vma, address, ptep);
+}
+
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
+				       unsigned long addr, pte_t *ptep)
+{
+	pte_t res;
+
+	res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
+	/* At this point the reference through the mapping is still present */
+	if (mm_is_protected(mm) && pte_present(res))
+		uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+	return res;
+}
+
+#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
+pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
+void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
+			     pte_t *, pte_t, pte_t);
+
+#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
+static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
+				     unsigned long addr, pte_t *ptep)
+{
+	pte_t res;
+
+	res = ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID));
+	/* At this point the reference through the mapping is still present */
+	if (mm_is_protected(vma->vm_mm) && pte_present(res))
+		uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+	return res;
+}
+
+/*
+ * The batched pte unmap code uses ptep_get_and_clear_full to clear the
+ * ptes. Here an optimization is possible. tlb_gather_mmu flushes all
+ * tlbs of an mm if it can guarantee that the ptes of the mm_struct
+ * cannot be accessed while the batched unmap is running. In this case
+ * full==1 and a simple pte_clear is enough. See tlb.h.
+ */
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
+static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
+					    unsigned long addr,
+					    pte_t *ptep, int full)
+{
+	pte_t res;
+
+	if (full) {
+		res = *ptep;
+		set_pte(ptep, __pte(_PAGE_INVALID));
+	} else {
+		res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
+	}
+	/* Nothing to do */
+	if (!mm_is_protected(mm) || !pte_present(res))
+		return res;
+	/*
+	 * At this point the reference through the mapping is still present.
+	 * The notifier should have destroyed all protected vCPUs at this
+	 * point, so the destroy should be successful.
+	 */
+	if (full && !uv_destroy_owned_page(pte_val(res) & PAGE_MASK))
+		return res;
+	/*
+	 * If something went wrong and the page could not be destroyed, or
+	 * if this is not a mm teardown, the slower export is used as
+	 * fallback instead.
+	 */
+	uv_convert_owned_from_secure(pte_val(res) & PAGE_MASK);
+	return res;
+}
+
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+static inline void ptep_set_wrprotect(struct mm_struct *mm,
+				      unsigned long addr, pte_t *ptep)
+{
+	pte_t pte = *ptep;
+
+	if (pte_write(pte))
+		ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte));
+}
+
+/*
+ * Check if PTEs only differ in _PAGE_PROTECT HW bit, but also allow SW PTE
+ * bits in the comparison. Those might change e.g. because of dirty and young
+ * tracking.
+ */
+static inline int pte_allow_rdp(pte_t old, pte_t new)
+{
+	/*
+	 * Only allow changes from RO to RW
+	 */
+	if (!(pte_val(old) & _PAGE_PROTECT) || pte_val(new) & _PAGE_PROTECT)
+		return 0;
+
+	return (pte_val(old) & _PAGE_RDP_MASK) == (pte_val(new) & _PAGE_RDP_MASK);
+}
+
+static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
+						unsigned long address,
+						pte_t *ptep)
+{
+	/*
+	 * RDP might not have propagated the PTE protection reset to all CPUs,
+	 * so there could be spurious TLB protection faults.
+	 * NOTE: This will also be called when a racing pagetable update on
+	 * another thread already installed the correct PTE. Both cases cannot
+	 * really be distinguished.
+	 * Therefore, only do the local TLB flush when RDP can be used, and the
+	 * PTE does not have _PAGE_PROTECT set, to avoid unnecessary overhead.
+	 * A local RDP can be used to do the flush.
+	 */
+	if (MACHINE_HAS_RDP && !(pte_val(*ptep) & _PAGE_PROTECT))
+		__ptep_rdp(address, ptep, 0, 0, 1);
+}
+#define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault
+
+void ptep_reset_dat_prot(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+			 pte_t new);
+
+#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+static inline int ptep_set_access_flags(struct vm_area_struct *vma,
+					unsigned long addr, pte_t *ptep,
+					pte_t entry, int dirty)
+{
+	if (pte_same(*ptep, entry))
+		return 0;
+	if (MACHINE_HAS_RDP && !mm_has_pgste(vma->vm_mm) && pte_allow_rdp(*ptep, entry))
+		ptep_reset_dat_prot(vma->vm_mm, addr, ptep, entry);
+	else
+		ptep_xchg_direct(vma->vm_mm, addr, ptep, entry);
+	return 1;
+}
+
+/*
+ * Additional functions to handle KVM guest page tables
+ */
+void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr,
+		     pte_t *ptep, pte_t entry);
+void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+void ptep_notify(struct mm_struct *mm, unsigned long addr,
+		 pte_t *ptep, unsigned long bits);
+int ptep_force_prot(struct mm_struct *mm, unsigned long gaddr,
+		    pte_t *ptep, int prot, unsigned long bit);
+void ptep_zap_unused(struct mm_struct *mm, unsigned long addr,
+		     pte_t *ptep , int reset);
+void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr,
+		    pte_t *sptep, pte_t *tptep, pte_t pte);
+void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep);
+
+bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long address,
+			    pte_t *ptep);
+int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
+			  unsigned char key, bool nq);
+int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
+			       unsigned char key, unsigned char *oldkey,
+			       bool nq, bool mr, bool mc);
+int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr);
+int get_guest_storage_key(struct mm_struct *mm, unsigned long addr,
+			  unsigned char *key);
+
+int set_pgste_bits(struct mm_struct *mm, unsigned long addr,
+				unsigned long bits, unsigned long value);
+int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep);
+int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc,
+			unsigned long *oldpte, unsigned long *oldpgste);
+void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr);
+void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr);
+void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr);
+void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr);
+
+#define pgprot_writecombine	pgprot_writecombine
+pgprot_t pgprot_writecombine(pgprot_t prot);
+
+#define pgprot_writethrough	pgprot_writethrough
+pgprot_t pgprot_writethrough(pgprot_t prot);
+
+/*
+ * Set multiple PTEs to consecutive pages with a single call.  All PTEs
+ * are within the same folio, PMD and VMA.
+ */
+static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
+			      pte_t *ptep, pte_t entry, unsigned int nr)
+{
+	if (pte_present(entry))
+		entry = clear_pte_bit(entry, __pgprot(_PAGE_UNUSED));
+	if (mm_has_pgste(mm)) {
+		for (;;) {
+			ptep_set_pte_at(mm, addr, ptep, entry);
+			if (--nr == 0)
+				break;
+			ptep++;
+			entry = __pte(pte_val(entry) + PAGE_SIZE);
+			addr += PAGE_SIZE;
+		}
+	} else {
+		for (;;) {
+			set_pte(ptep, entry);
+			if (--nr == 0)
+				break;
+			ptep++;
+			entry = __pte(pte_val(entry) + PAGE_SIZE);
+		}
+	}
+}
+#define set_ptes set_ptes
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
+{
+	pte_t __pte;
+
+	__pte = __pte(physpage | pgprot_val(pgprot));
+	if (!MACHINE_HAS_NX)
+		__pte = clear_pte_bit(__pte, __pgprot(_PAGE_NOEXEC));
+	return pte_mkyoung(__pte);
+}
+
+static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
+{
+	unsigned long physpage = page_to_phys(page);
+	pte_t __pte = mk_pte_phys(physpage, pgprot);
+
+	if (pte_write(__pte) && PageDirty(page))
+		__pte = pte_mkdirty(__pte);
+	return __pte;
+}
+
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D-1))
+#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+#define p4d_deref(pud) ((unsigned long)__va(p4d_val(pud) & _REGION_ENTRY_ORIGIN))
+#define pgd_deref(pgd) ((unsigned long)__va(pgd_val(pgd) & _REGION_ENTRY_ORIGIN))
+
+static inline unsigned long pmd_deref(pmd_t pmd)
+{
+	unsigned long origin_mask;
+
+	origin_mask = _SEGMENT_ENTRY_ORIGIN;
+	if (pmd_large(pmd))
+		origin_mask = _SEGMENT_ENTRY_ORIGIN_LARGE;
+	return (unsigned long)__va(pmd_val(pmd) & origin_mask);
+}
+
+static inline unsigned long pmd_pfn(pmd_t pmd)
+{
+	return __pa(pmd_deref(pmd)) >> PAGE_SHIFT;
+}
+
+static inline unsigned long pud_deref(pud_t pud)
+{
+	unsigned long origin_mask;
+
+	origin_mask = _REGION_ENTRY_ORIGIN;
+	if (pud_large(pud))
+		origin_mask = _REGION3_ENTRY_ORIGIN_LARGE;
+	return (unsigned long)__va(pud_val(pud) & origin_mask);
+}
+
+static inline unsigned long pud_pfn(pud_t pud)
+{
+	return __pa(pud_deref(pud)) >> PAGE_SHIFT;
+}
+
+/*
+ * The pgd_offset function *always* adds the index for the top-level
+ * region/segment table. This is done to get a sequence like the
+ * following to work:
+ *	pgdp = pgd_offset(current->mm, addr);
+ *	pgd = READ_ONCE(*pgdp);
+ *	p4dp = p4d_offset(&pgd, addr);
+ *	...
+ * The subsequent p4d_offset, pud_offset and pmd_offset functions
+ * only add an index if they dereferenced the pointer.
+ */
+static inline pgd_t *pgd_offset_raw(pgd_t *pgd, unsigned long address)
+{
+	unsigned long rste;
+	unsigned int shift;
+
+	/* Get the first entry of the top level table */
+	rste = pgd_val(*pgd);
+	/* Pick up the shift from the table type of the first entry */
+	shift = ((rste & _REGION_ENTRY_TYPE_MASK) >> 2) * 11 + 20;
+	return pgd + ((address >> shift) & (PTRS_PER_PGD - 1));
+}
+
+#define pgd_offset(mm, address) pgd_offset_raw(READ_ONCE((mm)->pgd), address)
+
+static inline p4d_t *p4d_offset_lockless(pgd_t *pgdp, pgd_t pgd, unsigned long address)
+{
+	if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R1)
+		return (p4d_t *) pgd_deref(pgd) + p4d_index(address);
+	return (p4d_t *) pgdp;
+}
+#define p4d_offset_lockless p4d_offset_lockless
+
+static inline p4d_t *p4d_offset(pgd_t *pgdp, unsigned long address)
+{
+	return p4d_offset_lockless(pgdp, *pgdp, address);
+}
+
+static inline pud_t *pud_offset_lockless(p4d_t *p4dp, p4d_t p4d, unsigned long address)
+{
+	if ((p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R2)
+		return (pud_t *) p4d_deref(p4d) + pud_index(address);
+	return (pud_t *) p4dp;
+}
+#define pud_offset_lockless pud_offset_lockless
+
+static inline pud_t *pud_offset(p4d_t *p4dp, unsigned long address)
+{
+	return pud_offset_lockless(p4dp, *p4dp, address);
+}
+#define pud_offset pud_offset
+
+static inline pmd_t *pmd_offset_lockless(pud_t *pudp, pud_t pud, unsigned long address)
+{
+	if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R3)
+		return (pmd_t *) pud_deref(pud) + pmd_index(address);
+	return (pmd_t *) pudp;
+}
+#define pmd_offset_lockless pmd_offset_lockless
+
+static inline pmd_t *pmd_offset(pud_t *pudp, unsigned long address)
+{
+	return pmd_offset_lockless(pudp, *pudp, address);
+}
+#define pmd_offset pmd_offset
+
+static inline unsigned long pmd_page_vaddr(pmd_t pmd)
+{
+	return (unsigned long) pmd_deref(pmd);
+}
+
+static inline bool gup_fast_permitted(unsigned long start, unsigned long end)
+{
+	return end <= current->mm->context.asce_limit;
+}
+#define gup_fast_permitted gup_fast_permitted
+
+#define pfn_pte(pfn, pgprot)	mk_pte_phys(((pfn) << PAGE_SHIFT), (pgprot))
+#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+#define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
+#define pud_page(pud) pfn_to_page(pud_pfn(pud))
+#define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
+#define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
+
+static inline pmd_t pmd_wrprotect(pmd_t pmd)
+{
+	pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_WRITE));
+	return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+}
+
+static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
+{
+	pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_WRITE));
+	if (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY)
+		pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+	return pmd;
+}
+
+static inline pmd_t pmd_mkclean(pmd_t pmd)
+{
+	pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_DIRTY));
+	return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+}
+
+static inline pmd_t pmd_mkdirty(pmd_t pmd)
+{
+	pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_SOFT_DIRTY));
+	if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE)
+		pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+	return pmd;
+}
+
+static inline pud_t pud_wrprotect(pud_t pud)
+{
+	pud = clear_pud_bit(pud, __pgprot(_REGION3_ENTRY_WRITE));
+	return set_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT));
+}
+
+static inline pud_t pud_mkwrite(pud_t pud)
+{
+	pud = set_pud_bit(pud, __pgprot(_REGION3_ENTRY_WRITE));
+	if (pud_val(pud) & _REGION3_ENTRY_DIRTY)
+		pud = clear_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT));
+	return pud;
+}
+
+static inline pud_t pud_mkclean(pud_t pud)
+{
+	pud = clear_pud_bit(pud, __pgprot(_REGION3_ENTRY_DIRTY));
+	return set_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT));
+}
+
+static inline pud_t pud_mkdirty(pud_t pud)
+{
+	pud = set_pud_bit(pud, __pgprot(_REGION3_ENTRY_DIRTY | _REGION3_ENTRY_SOFT_DIRTY));
+	if (pud_val(pud) & _REGION3_ENTRY_WRITE)
+		pud = clear_pud_bit(pud, __pgprot(_REGION_ENTRY_PROTECT));
+	return pud;
+}
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)
+static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
+{
+	/*
+	 * pgprot is PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW or PAGE_RWX
+	 * (see __Pxxx / __Sxxx). Convert to segment table entry format.
+	 */
+	if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))
+		return pgprot_val(SEGMENT_NONE);
+	if (pgprot_val(pgprot) == pgprot_val(PAGE_RO))
+		return pgprot_val(SEGMENT_RO);
+	if (pgprot_val(pgprot) == pgprot_val(PAGE_RX))
+		return pgprot_val(SEGMENT_RX);
+	if (pgprot_val(pgprot) == pgprot_val(PAGE_RW))
+		return pgprot_val(SEGMENT_RW);
+	return pgprot_val(SEGMENT_RWX);
+}
+
+static inline pmd_t pmd_mkyoung(pmd_t pmd)
+{
+	pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG));
+	if (pmd_val(pmd) & _SEGMENT_ENTRY_READ)
+		pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID));
+	return pmd;
+}
+
+static inline pmd_t pmd_mkold(pmd_t pmd)
+{
+	pmd = clear_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG));
+	return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID));
+}
+
+static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
+{
+	unsigned long mask;
+
+	mask  = _SEGMENT_ENTRY_ORIGIN_LARGE;
+	mask |= _SEGMENT_ENTRY_DIRTY;
+	mask |= _SEGMENT_ENTRY_YOUNG;
+	mask |=	_SEGMENT_ENTRY_LARGE;
+	mask |= _SEGMENT_ENTRY_SOFT_DIRTY;
+	pmd = __pmd(pmd_val(pmd) & mask);
+	pmd = set_pmd_bit(pmd, __pgprot(massage_pgprot_pmd(newprot)));
+	if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
+		pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+	if (!(pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG))
+		pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_INVALID));
+	return pmd;
+}
+
+static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
+{
+	return __pmd(physpage + massage_pgprot_pmd(pgprot));
+}
+
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
+
+static inline void __pmdp_csp(pmd_t *pmdp)
+{
+	csp((unsigned int *)pmdp + 1, pmd_val(*pmdp),
+	    pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID);
+}
+
+#define IDTE_GLOBAL	0
+#define IDTE_LOCAL	1
+
+#define IDTE_PTOA	0x0800
+#define IDTE_NODAT	0x1000
+#define IDTE_GUEST_ASCE	0x2000
+
+static __always_inline void __pmdp_idte(unsigned long addr, pmd_t *pmdp,
+					unsigned long opt, unsigned long asce,
+					int local)
+{
+	unsigned long sto;
+
+	sto = __pa(pmdp) - pmd_index(addr) * sizeof(pmd_t);
+	if (__builtin_constant_p(opt) && opt == 0) {
+		/* flush without guest asce */
+		asm volatile(
+			"	idte	%[r1],0,%[r2],%[m4]"
+			: "+m" (*pmdp)
+			: [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK)),
+			  [m4] "i" (local)
+			: "cc" );
+	} else {
+		/* flush with guest asce */
+		asm volatile(
+			"	idte	%[r1],%[r3],%[r2],%[m4]"
+			: "+m" (*pmdp)
+			: [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK) | opt),
+			  [r3] "a" (asce), [m4] "i" (local)
+			: "cc" );
+	}
+}
+
+static __always_inline void __pudp_idte(unsigned long addr, pud_t *pudp,
+					unsigned long opt, unsigned long asce,
+					int local)
+{
+	unsigned long r3o;
+
+	r3o = __pa(pudp) - pud_index(addr) * sizeof(pud_t);
+	r3o |= _ASCE_TYPE_REGION3;
+	if (__builtin_constant_p(opt) && opt == 0) {
+		/* flush without guest asce */
+		asm volatile(
+			"	idte	%[r1],0,%[r2],%[m4]"
+			: "+m" (*pudp)
+			: [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK)),
+			  [m4] "i" (local)
+			: "cc");
+	} else {
+		/* flush with guest asce */
+		asm volatile(
+			"	idte	%[r1],%[r3],%[r2],%[m4]"
+			: "+m" (*pudp)
+			: [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK) | opt),
+			  [r3] "a" (asce), [m4] "i" (local)
+			: "cc" );
+	}
+}
+
+pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
+pmd_t pmdp_xchg_lazy(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
+pud_t pudp_xchg_direct(struct mm_struct *, unsigned long, pud_t *, pud_t);
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
+#define __HAVE_ARCH_PGTABLE_DEPOSIT
+void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+				pgtable_t pgtable);
+
+#define __HAVE_ARCH_PGTABLE_WITHDRAW
+pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
+
+#define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
+static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
+					unsigned long addr, pmd_t *pmdp,
+					pmd_t entry, int dirty)
+{
+	VM_BUG_ON(addr & ~HPAGE_MASK);
+
+	entry = pmd_mkyoung(entry);
+	if (dirty)
+		entry = pmd_mkdirty(entry);
+	if (pmd_val(*pmdp) == pmd_val(entry))
+		return 0;
+	pmdp_xchg_direct(vma->vm_mm, addr, pmdp, entry);
+	return 1;
+}
+
+#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
+static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
+					    unsigned long addr, pmd_t *pmdp)
+{
+	pmd_t pmd = *pmdp;
+
+	pmd = pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd_mkold(pmd));
+	return pmd_young(pmd);
+}
+
+#define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
+static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
+					 unsigned long addr, pmd_t *pmdp)
+{
+	VM_BUG_ON(addr & ~HPAGE_MASK);
+	return pmdp_test_and_clear_young(vma, addr, pmdp);
+}
+
+static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+			      pmd_t *pmdp, pmd_t entry)
+{
+	if (!MACHINE_HAS_NX)
+		entry = clear_pmd_bit(entry, __pgprot(_SEGMENT_ENTRY_NOEXEC));
+	set_pmd(pmdp, entry);
+}
+
+static inline pmd_t pmd_mkhuge(pmd_t pmd)
+{
+	pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_LARGE));
+	pmd = set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_YOUNG));
+	return set_pmd_bit(pmd, __pgprot(_SEGMENT_ENTRY_PROTECT));
+}
+
+#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
+static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
+					    unsigned long addr, pmd_t *pmdp)
+{
+	return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
+}
+
+#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
+static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
+						 unsigned long addr,
+						 pmd_t *pmdp, int full)
+{
+	if (full) {
+		pmd_t pmd = *pmdp;
+		set_pmd(pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
+		return pmd;
+	}
+	return pmdp_xchg_lazy(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
+}
+
+#define __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
+static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
+					  unsigned long addr, pmd_t *pmdp)
+{
+	return pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
+}
+
+#define __HAVE_ARCH_PMDP_INVALIDATE
+static inline pmd_t pmdp_invalidate(struct vm_area_struct *vma,
+				   unsigned long addr, pmd_t *pmdp)
+{
+	pmd_t pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID);
+
+	return pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd);
+}
+
+#define __HAVE_ARCH_PMDP_SET_WRPROTECT
+static inline void pmdp_set_wrprotect(struct mm_struct *mm,
+				      unsigned long addr, pmd_t *pmdp)
+{
+	pmd_t pmd = *pmdp;
+
+	if (pmd_write(pmd))
+		pmd = pmdp_xchg_lazy(mm, addr, pmdp, pmd_wrprotect(pmd));
+}
+
+static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
+					unsigned long address,
+					pmd_t *pmdp)
+{
+	return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
+}
+#define pmdp_collapse_flush pmdp_collapse_flush
+
+#define pfn_pmd(pfn, pgprot)	mk_pmd_phys(((pfn) << PAGE_SHIFT), (pgprot))
+#define mk_pmd(page, pgprot)	pfn_pmd(page_to_pfn(page), (pgprot))
+
+static inline int pmd_trans_huge(pmd_t pmd)
+{
+	return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE;
+}
+
+#define has_transparent_hugepage has_transparent_hugepage
+static inline int has_transparent_hugepage(void)
+{
+	return MACHINE_HAS_EDAT1 ? 1 : 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+/*
+ * 64 bit swap entry format:
+ * A page-table entry has some bits we have to treat in a special way.
+ * Bits 54 and 63 are used to indicate the page type. Bit 53 marks the pte
+ * as invalid.
+ * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200
+ * |			  offset			|E11XX|type |S0|
+ * |0000000000111111111122222222223333333333444444444455|55555|55566|66|
+ * |0123456789012345678901234567890123456789012345678901|23456|78901|23|
+ *
+ * Bits 0-51 store the offset.
+ * Bit 52 (E) is used to remember PG_anon_exclusive.
+ * Bits 57-61 store the type.
+ * Bit 62 (S) is used for softdirty tracking.
+ * Bits 55 and 56 (X) are unused.
+ */
+
+#define __SWP_OFFSET_MASK	((1UL << 52) - 1)
+#define __SWP_OFFSET_SHIFT	12
+#define __SWP_TYPE_MASK		((1UL << 5) - 1)
+#define __SWP_TYPE_SHIFT	2
+
+static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
+{
+	unsigned long pteval;
+
+	pteval = _PAGE_INVALID | _PAGE_PROTECT;
+	pteval |= (offset & __SWP_OFFSET_MASK) << __SWP_OFFSET_SHIFT;
+	pteval |= (type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT;
+	return __pte(pteval);
+}
+
+static inline unsigned long __swp_type(swp_entry_t entry)
+{
+	return (entry.val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK;
+}
+
+static inline unsigned long __swp_offset(swp_entry_t entry)
+{
+	return (entry.val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK;
+}
+
+static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
+{
+	return (swp_entry_t) { pte_val(mk_swap_pte(type, offset)) };
+}
+
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
+
+extern int vmem_add_mapping(unsigned long start, unsigned long size);
+extern void vmem_remove_mapping(unsigned long start, unsigned long size);
+extern int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc);
+extern int vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot);
+extern void vmem_unmap_4k_page(unsigned long addr);
+extern pte_t *vmem_get_alloc_pte(unsigned long addr, bool alloc);
+extern int s390_enable_sie(void);
+extern int s390_enable_skey(void);
+extern void s390_reset_cmma(struct mm_struct *mm);
+
+/* s390 has a private copy of get unmapped area to deal with cache synonyms */
+#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+
+#define pmd_pgtable(pmd) \
+	((pgtable_t)__va(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE))
+
+#endif /* _S390_PAGE_H */