forked from Minki/linux
480e5926ce
598841ca99 ([S390] use gmap address
spaces for kvm guest images) changed kvm to use a separate address
space for kvm guests. This address space was switched in __vcpu_run
In some cases (preemption, page fault) there is the possibility that
this address space switch is lost.
The typical symptom was a huge amount of validity intercepts or
random guest addressing exceptions.
Fix this by doing the switch in sie_loop and sie_exit and saving the
address space in the gmap structure itself. Also use the preempt
notifier.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
1258 lines
37 KiB
C
1258 lines
37 KiB
C
/*
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* include/asm-s390/pgtable.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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* Ulrich Weigand (weigand@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/pgtable.h"
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*/
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#ifndef _ASM_S390_PGTABLE_H
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#define _ASM_S390_PGTABLE_H
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/*
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* The Linux memory management assumes a three-level page table setup. For
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* s390 31 bit we "fold" the mid level into the top-level page table, so
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* that we physically have the same two-level page table as the s390 mmu
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* expects in 31 bit mode. For s390 64 bit we use three of the five levels
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* the hardware provides (region first and region second tables are not
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* used).
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*
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* The "pgd_xxx()" functions are trivial for a folded two-level
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* setup: the pgd is never bad, and a pmd always exists (as it's folded
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* into the pgd entry)
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*
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* This file contains the functions and defines necessary to modify and use
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* the S390 page table tree.
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*/
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#ifndef __ASSEMBLY__
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#include <linux/sched.h>
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#include <linux/mm_types.h>
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#include <asm/bug.h>
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#include <asm/page.h>
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extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096)));
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extern void paging_init(void);
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extern void vmem_map_init(void);
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extern void fault_init(void);
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/*
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* The S390 doesn't have any external MMU info: the kernel page
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* tables contain all the necessary information.
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*/
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#define update_mmu_cache(vma, address, ptep) do { } while (0)
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/*
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* ZERO_PAGE is a global shared page that is always zero; used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page;
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extern unsigned long zero_page_mask;
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#define ZERO_PAGE(vaddr) \
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(virt_to_page((void *)(empty_zero_page + \
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(((unsigned long)(vaddr)) &zero_page_mask))))
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#define is_zero_pfn is_zero_pfn
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static inline int is_zero_pfn(unsigned long pfn)
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{
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extern unsigned long zero_pfn;
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unsigned long offset_from_zero_pfn = pfn - zero_pfn;
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return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
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}
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#define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
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#endif /* !__ASSEMBLY__ */
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/*
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* PMD_SHIFT determines the size of the area a second-level page
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* table can map
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* PGDIR_SHIFT determines what a third-level page table entry can map
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*/
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#ifndef __s390x__
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# define PMD_SHIFT 20
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# define PUD_SHIFT 20
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# define PGDIR_SHIFT 20
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#else /* __s390x__ */
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# define PMD_SHIFT 20
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# define PUD_SHIFT 31
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# define PGDIR_SHIFT 42
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#endif /* __s390x__ */
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PUD_SIZE (1UL << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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/*
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* entries per page directory level: the S390 is two-level, so
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* we don't really have any PMD directory physically.
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* for S390 segment-table entries are combined to one PGD
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* that leads to 1024 pte per pgd
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*/
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#define PTRS_PER_PTE 256
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#ifndef __s390x__
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PUD 1
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#else /* __s390x__ */
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#define PTRS_PER_PMD 2048
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#define PTRS_PER_PUD 2048
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#endif /* __s390x__ */
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#define PTRS_PER_PGD 2048
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#define FIRST_USER_ADDRESS 0
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e))
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#define pud_ERROR(e) \
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printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e))
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#ifndef __ASSEMBLY__
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/*
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* The vmalloc area will always be on the topmost area of the kernel
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* mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc,
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* which should be enough for any sane case.
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* By putting vmalloc at the top, we maximise the gap between physical
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* memory and vmalloc to catch misplaced memory accesses. As a side
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* effect, this also makes sure that 64 bit module code cannot be used
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* as system call address.
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*/
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extern unsigned long VMALLOC_START;
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#ifndef __s390x__
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#define VMALLOC_SIZE (96UL << 20)
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#define VMALLOC_END 0x7e000000UL
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#define VMEM_MAP_END 0x80000000UL
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#else /* __s390x__ */
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#define VMALLOC_SIZE (128UL << 30)
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#define VMALLOC_END 0x3e000000000UL
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#define VMEM_MAP_END 0x40000000000UL
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#endif /* __s390x__ */
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/*
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* VMEM_MAX_PHYS is the highest physical address that can be added to the 1:1
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* mapping. This needs to be calculated at compile time since the size of the
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* VMEM_MAP is static but the size of struct page can change.
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*/
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#define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page))
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#define VMEM_MAX_PFN min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES)
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#define VMEM_MAX_PHYS ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1))
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#define vmemmap ((struct page *) VMALLOC_END)
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/*
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* A 31 bit pagetable entry of S390 has following format:
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* | PFRA | | OS |
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* 0 0IP0
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* 00000000001111111111222222222233
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* 01234567890123456789012345678901
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*
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* I Page-Invalid Bit: Page is not available for address-translation
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* P Page-Protection Bit: Store access not possible for page
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*
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* A 31 bit segmenttable entry of S390 has following format:
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* | P-table origin | |PTL
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* 0 IC
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* 00000000001111111111222222222233
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* 01234567890123456789012345678901
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*
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* I Segment-Invalid Bit: Segment is not available for address-translation
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* C Common-Segment Bit: Segment is not private (PoP 3-30)
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* PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256)
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*
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* The 31 bit segmenttable origin of S390 has following format:
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*
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* |S-table origin | | STL |
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* X **GPS
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* 00000000001111111111222222222233
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* 01234567890123456789012345678901
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*
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* X Space-Switch event:
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* G Segment-Invalid Bit: *
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* P Private-Space Bit: Segment is not private (PoP 3-30)
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* S Storage-Alteration:
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* STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048)
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*
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* A 64 bit pagetable entry of S390 has following format:
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* | PFRA |0IPC| OS |
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* 0000000000111111111122222222223333333333444444444455555555556666
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* 0123456789012345678901234567890123456789012345678901234567890123
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*
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* I Page-Invalid Bit: Page is not available for address-translation
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* P Page-Protection Bit: Store access not possible for page
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* C Change-bit override: HW is not required to set change bit
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*
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* A 64 bit segmenttable entry of S390 has following format:
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* | P-table origin | TT
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* 0000000000111111111122222222223333333333444444444455555555556666
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* 0123456789012345678901234567890123456789012345678901234567890123
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*
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* I Segment-Invalid Bit: Segment is not available for address-translation
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* C Common-Segment Bit: Segment is not private (PoP 3-30)
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* P Page-Protection Bit: Store access not possible for page
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* TT Type 00
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*
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* A 64 bit region table entry of S390 has following format:
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* | S-table origin | TF TTTL
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* 0000000000111111111122222222223333333333444444444455555555556666
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* 0123456789012345678901234567890123456789012345678901234567890123
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*
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* I Segment-Invalid Bit: Segment is not available for address-translation
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* TT Type 01
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* TF
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* TL Table length
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*
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* The 64 bit regiontable origin of S390 has following format:
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* | region table origon | DTTL
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* 0000000000111111111122222222223333333333444444444455555555556666
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* 0123456789012345678901234567890123456789012345678901234567890123
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*
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* X Space-Switch event:
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* G Segment-Invalid Bit:
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* P Private-Space Bit:
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* S Storage-Alteration:
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* R Real space
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* TL Table-Length:
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*
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* A storage key has the following format:
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* | ACC |F|R|C|0|
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* 0 3 4 5 6 7
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* ACC: access key
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* F : fetch protection bit
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* R : referenced bit
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* C : changed bit
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*/
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/* Hardware bits in the page table entry */
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#define _PAGE_CO 0x100 /* HW Change-bit override */
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#define _PAGE_RO 0x200 /* HW read-only bit */
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#define _PAGE_INVALID 0x400 /* HW invalid bit */
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/* Software bits in the page table entry */
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#define _PAGE_SWT 0x001 /* SW pte type bit t */
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#define _PAGE_SWX 0x002 /* SW pte type bit x */
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#define _PAGE_SWC 0x004 /* SW pte changed bit (for KVM) */
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#define _PAGE_SWR 0x008 /* SW pte referenced bit (for KVM) */
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#define _PAGE_SPECIAL 0x010 /* SW associated with special page */
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#define __HAVE_ARCH_PTE_SPECIAL
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/* Set of bits not changed in pte_modify */
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#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_SWC | _PAGE_SWR)
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/* Six different types of pages. */
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#define _PAGE_TYPE_EMPTY 0x400
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#define _PAGE_TYPE_NONE 0x401
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#define _PAGE_TYPE_SWAP 0x403
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#define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */
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#define _PAGE_TYPE_RO 0x200
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#define _PAGE_TYPE_RW 0x000
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/*
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* Only four types for huge pages, using the invalid bit and protection bit
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* of a segment table entry.
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*/
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#define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */
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#define _HPAGE_TYPE_NONE 0x220
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#define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */
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#define _HPAGE_TYPE_RW 0x000
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/*
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* PTE type bits are rather complicated. handle_pte_fault uses pte_present,
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* pte_none and pte_file to find out the pte type WITHOUT holding the page
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* table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to
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* invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs
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* for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards.
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* This change is done while holding the lock, but the intermediate step
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* of a previously valid pte with the hw invalid bit set can be observed by
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* handle_pte_fault. That makes it necessary that all valid pte types with
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* the hw invalid bit set must be distinguishable from the four pte types
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* empty, none, swap and file.
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*
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* irxt ipte irxt
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* _PAGE_TYPE_EMPTY 1000 -> 1000
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* _PAGE_TYPE_NONE 1001 -> 1001
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* _PAGE_TYPE_SWAP 1011 -> 1011
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* _PAGE_TYPE_FILE 11?1 -> 11?1
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* _PAGE_TYPE_RO 0100 -> 1100
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* _PAGE_TYPE_RW 0000 -> 1000
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*
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* pte_none is true for bits combinations 1000, 1010, 1100, 1110
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* pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001
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* pte_file is true for bits combinations 1101, 1111
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* swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid.
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*/
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#ifndef __s390x__
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/* Bits in the segment table address-space-control-element */
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#define _ASCE_SPACE_SWITCH 0x80000000UL /* space switch event */
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#define _ASCE_ORIGIN_MASK 0x7ffff000UL /* segment table origin */
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#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
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#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
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#define _ASCE_TABLE_LENGTH 0x7f /* 128 x 64 entries = 8k */
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/* Bits in the segment table entry */
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#define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */
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#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
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#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
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#define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */
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#define _SEGMENT_ENTRY_PTL 0x0f /* page table length */
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#define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL)
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#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
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/* Page status table bits for virtualization */
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#define RCP_ACC_BITS 0xf0000000UL
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#define RCP_FP_BIT 0x08000000UL
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#define RCP_PCL_BIT 0x00800000UL
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#define RCP_HR_BIT 0x00400000UL
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#define RCP_HC_BIT 0x00200000UL
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#define RCP_GR_BIT 0x00040000UL
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#define RCP_GC_BIT 0x00020000UL
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/* User dirty / referenced bit for KVM's migration feature */
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#define KVM_UR_BIT 0x00008000UL
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#define KVM_UC_BIT 0x00004000UL
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#else /* __s390x__ */
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/* Bits in the segment/region table address-space-control-element */
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#define _ASCE_ORIGIN ~0xfffUL/* segment table origin */
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#define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
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#define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
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#define _ASCE_SPACE_SWITCH 0x40 /* space switch event */
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#define _ASCE_REAL_SPACE 0x20 /* real space control */
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#define _ASCE_TYPE_MASK 0x0c /* asce table type mask */
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#define _ASCE_TYPE_REGION1 0x0c /* region first table type */
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#define _ASCE_TYPE_REGION2 0x08 /* region second table type */
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#define _ASCE_TYPE_REGION3 0x04 /* region third table type */
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#define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */
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#define _ASCE_TABLE_LENGTH 0x03 /* region table length */
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/* Bits in the region table entry */
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#define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */
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#define _REGION_ENTRY_INV 0x20 /* invalid region table entry */
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#define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */
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#define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */
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#define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */
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#define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */
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#define _REGION_ENTRY_LENGTH 0x03 /* region third length */
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#define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH)
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#define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INV)
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#define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
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#define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INV)
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#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
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#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
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/* Bits in the segment table entry */
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#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
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#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
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#define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
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#define _SEGMENT_ENTRY (0)
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#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
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#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
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#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
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/* Page status table bits for virtualization */
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#define RCP_ACC_BITS 0xf000000000000000UL
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#define RCP_FP_BIT 0x0800000000000000UL
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#define RCP_PCL_BIT 0x0080000000000000UL
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#define RCP_HR_BIT 0x0040000000000000UL
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#define RCP_HC_BIT 0x0020000000000000UL
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#define RCP_GR_BIT 0x0004000000000000UL
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#define RCP_GC_BIT 0x0002000000000000UL
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/* User dirty / referenced bit for KVM's migration feature */
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#define KVM_UR_BIT 0x0000800000000000UL
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#define KVM_UC_BIT 0x0000400000000000UL
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#endif /* __s390x__ */
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/*
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* A user page table pointer has the space-switch-event bit, the
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* private-space-control bit and the storage-alteration-event-control
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* bit set. A kernel page table pointer doesn't need them.
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*/
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#define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \
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_ASCE_ALT_EVENT)
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/*
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* Page protection definitions.
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*/
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#define PAGE_NONE __pgprot(_PAGE_TYPE_NONE)
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#define PAGE_RO __pgprot(_PAGE_TYPE_RO)
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#define PAGE_RW __pgprot(_PAGE_TYPE_RW)
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#define PAGE_KERNEL PAGE_RW
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#define PAGE_COPY PAGE_RO
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/*
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* On s390 the page table entry has an invalid bit and a read-only bit.
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* Read permission implies execute permission and write permission
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* implies read permission.
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*/
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/*xwr*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_RO
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#define __P010 PAGE_RO
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#define __P011 PAGE_RO
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#define __P100 PAGE_RO
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#define __P101 PAGE_RO
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#define __P110 PAGE_RO
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#define __P111 PAGE_RO
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#define __S000 PAGE_NONE
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#define __S001 PAGE_RO
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#define __S010 PAGE_RW
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#define __S011 PAGE_RW
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|
#define __S100 PAGE_RO
|
|
#define __S101 PAGE_RO
|
|
#define __S110 PAGE_RW
|
|
#define __S111 PAGE_RW
|
|
|
|
static inline int mm_exclusive(struct mm_struct *mm)
|
|
{
|
|
return likely(mm == current->active_mm &&
|
|
atomic_read(&mm->context.attach_count) <= 1);
|
|
}
|
|
|
|
static inline int mm_has_pgste(struct mm_struct *mm)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
if (unlikely(mm->context.has_pgste))
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
/*
|
|
* pgd/pmd/pte query functions
|
|
*/
|
|
#ifndef __s390x__
|
|
|
|
static inline int pgd_present(pgd_t pgd) { return 1; }
|
|
static inline int pgd_none(pgd_t pgd) { return 0; }
|
|
static inline int pgd_bad(pgd_t pgd) { return 0; }
|
|
|
|
static inline int pud_present(pud_t pud) { return 1; }
|
|
static inline int pud_none(pud_t pud) { return 0; }
|
|
static inline int pud_bad(pud_t pud) { return 0; }
|
|
|
|
#else /* __s390x__ */
|
|
|
|
static inline int pgd_present(pgd_t pgd)
|
|
{
|
|
if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
|
|
return 1;
|
|
return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
|
|
}
|
|
|
|
static inline int pgd_none(pgd_t pgd)
|
|
{
|
|
if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
|
|
return 0;
|
|
return (pgd_val(pgd) & _REGION_ENTRY_INV) != 0UL;
|
|
}
|
|
|
|
static inline int pgd_bad(pgd_t pgd)
|
|
{
|
|
/*
|
|
* With dynamic page table levels the pgd can be a region table
|
|
* entry or a segment table entry. Check for the bit that are
|
|
* invalid for either table entry.
|
|
*/
|
|
unsigned long mask =
|
|
~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
|
|
~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
|
|
return (pgd_val(pgd) & mask) != 0;
|
|
}
|
|
|
|
static inline int pud_present(pud_t pud)
|
|
{
|
|
if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
|
|
return 1;
|
|
return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
|
|
}
|
|
|
|
static inline int pud_none(pud_t pud)
|
|
{
|
|
if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
|
|
return 0;
|
|
return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL;
|
|
}
|
|
|
|
static inline int pud_bad(pud_t pud)
|
|
{
|
|
/*
|
|
* With dynamic page table levels the pud can be a region table
|
|
* entry or a segment table entry. Check for the bit that are
|
|
* invalid for either table entry.
|
|
*/
|
|
unsigned long mask =
|
|
~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
|
|
~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
|
|
return (pud_val(pud) & mask) != 0;
|
|
}
|
|
|
|
#endif /* __s390x__ */
|
|
|
|
static inline int pmd_present(pmd_t pmd)
|
|
{
|
|
return (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) != 0UL;
|
|
}
|
|
|
|
static inline int pmd_none(pmd_t pmd)
|
|
{
|
|
return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) != 0UL;
|
|
}
|
|
|
|
static inline int pmd_bad(pmd_t pmd)
|
|
{
|
|
unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV;
|
|
return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY;
|
|
}
|
|
|
|
static inline int pte_none(pte_t pte)
|
|
{
|
|
return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT);
|
|
}
|
|
|
|
static inline int pte_present(pte_t pte)
|
|
{
|
|
unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX;
|
|
return (pte_val(pte) & mask) == _PAGE_TYPE_NONE ||
|
|
(!(pte_val(pte) & _PAGE_INVALID) &&
|
|
!(pte_val(pte) & _PAGE_SWT));
|
|
}
|
|
|
|
static inline int pte_file(pte_t pte)
|
|
{
|
|
unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT;
|
|
return (pte_val(pte) & mask) == _PAGE_TYPE_FILE;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static inline pgste_t pgste_get_lock(pte_t *ptep)
|
|
{
|
|
unsigned long new = 0;
|
|
#ifdef CONFIG_PGSTE
|
|
unsigned long old;
|
|
|
|
preempt_disable();
|
|
asm(
|
|
" lg %0,%2\n"
|
|
"0: lgr %1,%0\n"
|
|
" nihh %0,0xff7f\n" /* clear RCP_PCL_BIT in old */
|
|
" oihh %1,0x0080\n" /* set RCP_PCL_BIT in new */
|
|
" csg %0,%1,%2\n"
|
|
" jl 0b\n"
|
|
: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
|
|
: "Q" (ptep[PTRS_PER_PTE]) : "cc");
|
|
#endif
|
|
return __pgste(new);
|
|
}
|
|
|
|
static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
asm(
|
|
" nihh %1,0xff7f\n" /* clear RCP_PCL_BIT */
|
|
" stg %1,%0\n"
|
|
: "=Q" (ptep[PTRS_PER_PTE])
|
|
: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc");
|
|
preempt_enable();
|
|
#endif
|
|
}
|
|
|
|
static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
unsigned long address, bits;
|
|
unsigned char skey;
|
|
|
|
address = pte_val(*ptep) & PAGE_MASK;
|
|
skey = page_get_storage_key(address);
|
|
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
|
|
/* Clear page changed & referenced bit in the storage key */
|
|
if (bits) {
|
|
skey ^= bits;
|
|
page_set_storage_key(address, skey, 1);
|
|
}
|
|
/* Transfer page changed & referenced bit to guest bits in pgste */
|
|
pgste_val(pgste) |= bits << 48; /* RCP_GR_BIT & RCP_GC_BIT */
|
|
/* Get host changed & referenced bits from pgste */
|
|
bits |= (pgste_val(pgste) & (RCP_HR_BIT | RCP_HC_BIT)) >> 52;
|
|
/* Clear host bits in pgste. */
|
|
pgste_val(pgste) &= ~(RCP_HR_BIT | RCP_HC_BIT);
|
|
pgste_val(pgste) &= ~(RCP_ACC_BITS | RCP_FP_BIT);
|
|
/* Copy page access key and fetch protection bit to pgste */
|
|
pgste_val(pgste) |=
|
|
(unsigned long) (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
|
|
/* Transfer changed and referenced to kvm user bits */
|
|
pgste_val(pgste) |= bits << 45; /* KVM_UR_BIT & KVM_UC_BIT */
|
|
/* Transfer changed & referenced to pte sofware bits */
|
|
pte_val(*ptep) |= bits << 1; /* _PAGE_SWR & _PAGE_SWC */
|
|
#endif
|
|
return pgste;
|
|
|
|
}
|
|
|
|
static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
int young;
|
|
|
|
young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK);
|
|
/* Transfer page referenced bit to pte software bit (host view) */
|
|
if (young || (pgste_val(pgste) & RCP_HR_BIT))
|
|
pte_val(*ptep) |= _PAGE_SWR;
|
|
/* Clear host referenced bit in pgste. */
|
|
pgste_val(pgste) &= ~RCP_HR_BIT;
|
|
/* Transfer page referenced bit to guest bit in pgste */
|
|
pgste_val(pgste) |= (unsigned long) young << 50; /* set RCP_GR_BIT */
|
|
#endif
|
|
return pgste;
|
|
|
|
}
|
|
|
|
static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
unsigned long address;
|
|
unsigned long okey, nkey;
|
|
|
|
address = pte_val(*ptep) & PAGE_MASK;
|
|
okey = nkey = page_get_storage_key(address);
|
|
nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
|
|
/* Set page access key and fetch protection bit from pgste */
|
|
nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
|
|
if (okey != nkey)
|
|
page_set_storage_key(address, nkey, 1);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* struct gmap_struct - guest address space
|
|
* @mm: pointer to the parent mm_struct
|
|
* @table: pointer to the page directory
|
|
* @asce: address space control element for gmap page table
|
|
* @crst_list: list of all crst tables used in the guest address space
|
|
*/
|
|
struct gmap {
|
|
struct list_head list;
|
|
struct mm_struct *mm;
|
|
unsigned long *table;
|
|
unsigned long asce;
|
|
struct list_head crst_list;
|
|
};
|
|
|
|
/**
|
|
* struct gmap_rmap - reverse mapping for segment table entries
|
|
* @next: pointer to the next gmap_rmap structure in the list
|
|
* @entry: pointer to a segment table entry
|
|
*/
|
|
struct gmap_rmap {
|
|
struct list_head list;
|
|
unsigned long *entry;
|
|
};
|
|
|
|
/**
|
|
* struct gmap_pgtable - gmap information attached to a page table
|
|
* @vmaddr: address of the 1MB segment in the process virtual memory
|
|
* @mapper: list of segment table entries maping a page table
|
|
*/
|
|
struct gmap_pgtable {
|
|
unsigned long vmaddr;
|
|
struct list_head mapper;
|
|
};
|
|
|
|
struct gmap *gmap_alloc(struct mm_struct *mm);
|
|
void gmap_free(struct gmap *gmap);
|
|
void gmap_enable(struct gmap *gmap);
|
|
void gmap_disable(struct gmap *gmap);
|
|
int gmap_map_segment(struct gmap *gmap, unsigned long from,
|
|
unsigned long to, unsigned long length);
|
|
int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
|
|
unsigned long gmap_fault(unsigned long address, struct gmap *);
|
|
|
|
/*
|
|
* Certain architectures need to do special things when PTEs
|
|
* within a page table are directly modified. Thus, the following
|
|
* hook is made available.
|
|
*/
|
|
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep, pte_t entry)
|
|
{
|
|
pgste_t pgste;
|
|
|
|
if (mm_has_pgste(mm)) {
|
|
pgste = pgste_get_lock(ptep);
|
|
pgste_set_pte(ptep, pgste);
|
|
*ptep = entry;
|
|
pgste_set_unlock(ptep, pgste);
|
|
} else
|
|
*ptep = entry;
|
|
}
|
|
|
|
/*
|
|
* 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_RO) == 0;
|
|
}
|
|
|
|
static inline int pte_dirty(pte_t pte)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
if (pte_val(pte) & _PAGE_SWC)
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static inline int pte_young(pte_t pte)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
if (pte_val(pte) & _PAGE_SWR)
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* pgd/pmd/pte modification functions
|
|
*/
|
|
|
|
static inline void pgd_clear(pgd_t *pgd)
|
|
{
|
|
#ifdef __s390x__
|
|
if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
|
|
pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
|
|
#endif
|
|
}
|
|
|
|
static inline void pud_clear(pud_t *pud)
|
|
{
|
|
#ifdef __s390x__
|
|
if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
|
|
pud_val(*pud) = _REGION3_ENTRY_EMPTY;
|
|
#endif
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
|
|
}
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
|
|
{
|
|
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
|
|
}
|
|
|
|
/*
|
|
* 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_val(pte) &= _PAGE_CHG_MASK;
|
|
pte_val(pte) |= pgprot_val(newprot);
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_wrprotect(pte_t pte)
|
|
{
|
|
/* Do not clobber _PAGE_TYPE_NONE pages! */
|
|
if (!(pte_val(pte) & _PAGE_INVALID))
|
|
pte_val(pte) |= _PAGE_RO;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkwrite(pte_t pte)
|
|
{
|
|
pte_val(pte) &= ~_PAGE_RO;
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkclean(pte_t pte)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
pte_val(pte) &= ~_PAGE_SWC;
|
|
#endif
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkdirty(pte_t pte)
|
|
{
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkold(pte_t pte)
|
|
{
|
|
#ifdef CONFIG_PGSTE
|
|
pte_val(pte) &= ~_PAGE_SWR;
|
|
#endif
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkyoung(pte_t pte)
|
|
{
|
|
return pte;
|
|
}
|
|
|
|
static inline pte_t pte_mkspecial(pte_t pte)
|
|
{
|
|
pte_val(pte) |= _PAGE_SPECIAL;
|
|
return pte;
|
|
}
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
static inline pte_t pte_mkhuge(pte_t pte)
|
|
{
|
|
/*
|
|
* PROT_NONE needs to be remapped from the pte type to the ste type.
|
|
* The HW invalid bit is also different for pte and ste. The pte
|
|
* invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
|
|
* bit, so we don't have to clear it.
|
|
*/
|
|
if (pte_val(pte) & _PAGE_INVALID) {
|
|
if (pte_val(pte) & _PAGE_SWT)
|
|
pte_val(pte) |= _HPAGE_TYPE_NONE;
|
|
pte_val(pte) |= _SEGMENT_ENTRY_INV;
|
|
}
|
|
/*
|
|
* Clear SW pte bits SWT and SWX, there are no SW bits in a segment
|
|
* table entry.
|
|
*/
|
|
pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
|
|
/*
|
|
* Also set the change-override bit because we don't need dirty bit
|
|
* tracking for hugetlbfs pages.
|
|
*/
|
|
pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
|
|
return pte;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Get (and clear) the user dirty bit for a pte.
|
|
*/
|
|
static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
|
|
pte_t *ptep)
|
|
{
|
|
pgste_t pgste;
|
|
int dirty = 0;
|
|
|
|
if (mm_has_pgste(mm)) {
|
|
pgste = pgste_get_lock(ptep);
|
|
pgste = pgste_update_all(ptep, pgste);
|
|
dirty = !!(pgste_val(pgste) & KVM_UC_BIT);
|
|
pgste_val(pgste) &= ~KVM_UC_BIT;
|
|
pgste_set_unlock(ptep, pgste);
|
|
return dirty;
|
|
}
|
|
return dirty;
|
|
}
|
|
|
|
/*
|
|
* Get (and clear) the user referenced bit for a pte.
|
|
*/
|
|
static inline int ptep_test_and_clear_user_young(struct mm_struct *mm,
|
|
pte_t *ptep)
|
|
{
|
|
pgste_t pgste;
|
|
int young = 0;
|
|
|
|
if (mm_has_pgste(mm)) {
|
|
pgste = pgste_get_lock(ptep);
|
|
pgste = pgste_update_young(ptep, pgste);
|
|
young = !!(pgste_val(pgste) & KVM_UR_BIT);
|
|
pgste_val(pgste) &= ~KVM_UR_BIT;
|
|
pgste_set_unlock(ptep, pgste);
|
|
}
|
|
return young;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
pgste_t pgste;
|
|
pte_t pte;
|
|
|
|
if (mm_has_pgste(vma->vm_mm)) {
|
|
pgste = pgste_get_lock(ptep);
|
|
pgste = pgste_update_young(ptep, pgste);
|
|
pte = *ptep;
|
|
*ptep = pte_mkold(pte);
|
|
pgste_set_unlock(ptep, pgste);
|
|
return pte_young(pte);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
/* No need to flush TLB
|
|
* On s390 reference bits are in storage key and never in TLB
|
|
* With virtualization we handle the reference bit, without we
|
|
* we can simply return */
|
|
return ptep_test_and_clear_young(vma, address, ptep);
|
|
}
|
|
|
|
static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
|
|
{
|
|
if (!(pte_val(*ptep) & _PAGE_INVALID)) {
|
|
#ifndef __s390x__
|
|
/* pto must point to the start of the segment table */
|
|
pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
|
|
#else
|
|
/* ipte in zarch mode can do the math */
|
|
pte_t *pto = ptep;
|
|
#endif
|
|
asm volatile(
|
|
" ipte %2,%3"
|
|
: "=m" (*ptep) : "m" (*ptep),
|
|
"a" (pto), "a" (address));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
|
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
|
|
unsigned long address, pte_t *ptep)
|
|
{
|
|
pgste_t pgste;
|
|
pte_t pte;
|
|
|
|
mm->context.flush_mm = 1;
|
|
if (mm_has_pgste(mm))
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
pte = *ptep;
|
|
if (!mm_exclusive(mm))
|
|
__ptep_ipte(address, ptep);
|
|
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
|
|
|
|
if (mm_has_pgste(mm)) {
|
|
pgste = pgste_update_all(&pte, pgste);
|
|
pgste_set_unlock(ptep, pgste);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
|
|
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
|
|
unsigned long address,
|
|
pte_t *ptep)
|
|
{
|
|
pte_t pte;
|
|
|
|
mm->context.flush_mm = 1;
|
|
if (mm_has_pgste(mm))
|
|
pgste_get_lock(ptep);
|
|
|
|
pte = *ptep;
|
|
if (!mm_exclusive(mm))
|
|
__ptep_ipte(address, ptep);
|
|
return pte;
|
|
}
|
|
|
|
static inline void ptep_modify_prot_commit(struct mm_struct *mm,
|
|
unsigned long address,
|
|
pte_t *ptep, pte_t pte)
|
|
{
|
|
*ptep = pte;
|
|
if (mm_has_pgste(mm))
|
|
pgste_set_unlock(ptep, *(pgste_t *)(ptep + PTRS_PER_PTE));
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
|
|
static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
|
|
unsigned long address, pte_t *ptep)
|
|
{
|
|
pgste_t pgste;
|
|
pte_t pte;
|
|
|
|
if (mm_has_pgste(vma->vm_mm))
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
pte = *ptep;
|
|
__ptep_ipte(address, ptep);
|
|
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
|
|
|
|
if (mm_has_pgste(vma->vm_mm)) {
|
|
pgste = pgste_update_all(&pte, pgste);
|
|
pgste_set_unlock(ptep, pgste);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* 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 address,
|
|
pte_t *ptep, int full)
|
|
{
|
|
pgste_t pgste;
|
|
pte_t pte;
|
|
|
|
if (mm_has_pgste(mm))
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
pte = *ptep;
|
|
if (!full)
|
|
__ptep_ipte(address, ptep);
|
|
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
|
|
|
|
if (mm_has_pgste(mm)) {
|
|
pgste = pgste_update_all(&pte, pgste);
|
|
pgste_set_unlock(ptep, pgste);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
|
|
unsigned long address, pte_t *ptep)
|
|
{
|
|
pgste_t pgste;
|
|
pte_t pte = *ptep;
|
|
|
|
if (pte_write(pte)) {
|
|
mm->context.flush_mm = 1;
|
|
if (mm_has_pgste(mm))
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
if (!mm_exclusive(mm))
|
|
__ptep_ipte(address, ptep);
|
|
*ptep = pte_wrprotect(pte);
|
|
|
|
if (mm_has_pgste(mm))
|
|
pgste_set_unlock(ptep, pgste);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
|
|
static inline int ptep_set_access_flags(struct vm_area_struct *vma,
|
|
unsigned long address, pte_t *ptep,
|
|
pte_t entry, int dirty)
|
|
{
|
|
pgste_t pgste;
|
|
|
|
if (pte_same(*ptep, entry))
|
|
return 0;
|
|
if (mm_has_pgste(vma->vm_mm))
|
|
pgste = pgste_get_lock(ptep);
|
|
|
|
__ptep_ipte(address, ptep);
|
|
*ptep = entry;
|
|
|
|
if (mm_has_pgste(vma->vm_mm))
|
|
pgste_set_unlock(ptep, pgste);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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_val(__pte) = physpage + pgprot_val(pgprot);
|
|
return __pte;
|
|
}
|
|
|
|
static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
|
|
{
|
|
unsigned long physpage = page_to_phys(page);
|
|
|
|
return mk_pte_phys(physpage, pgprot);
|
|
}
|
|
|
|
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
|
|
#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
|
|
#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
|
|
#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
|
|
|
|
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
|
|
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
|
|
|
|
#ifndef __s390x__
|
|
|
|
#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
|
|
#define pud_deref(pmd) ({ BUG(); 0UL; })
|
|
#define pgd_deref(pmd) ({ BUG(); 0UL; })
|
|
|
|
#define pud_offset(pgd, address) ((pud_t *) pgd)
|
|
#define pmd_offset(pud, address) ((pmd_t *) pud + pmd_index(address))
|
|
|
|
#else /* __s390x__ */
|
|
|
|
#define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
|
|
#define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
|
|
#define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN)
|
|
|
|
static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
|
|
{
|
|
pud_t *pud = (pud_t *) pgd;
|
|
if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
|
|
pud = (pud_t *) pgd_deref(*pgd);
|
|
return pud + pud_index(address);
|
|
}
|
|
|
|
static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
|
|
{
|
|
pmd_t *pmd = (pmd_t *) pud;
|
|
if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
|
|
pmd = (pmd_t *) pud_deref(*pud);
|
|
return pmd + pmd_index(address);
|
|
}
|
|
|
|
#endif /* __s390x__ */
|
|
|
|
#define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((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_val(pmd) >> PAGE_SHIFT)
|
|
|
|
/* Find an entry in the lowest level page table.. */
|
|
#define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
|
|
#define pte_offset_kernel(pmd, address) pte_offset(pmd,address)
|
|
#define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
|
|
#define pte_unmap(pte) do { } while (0)
|
|
|
|
/*
|
|
* 31 bit swap entry format:
|
|
* A page-table entry has some bits we have to treat in a special way.
|
|
* Bits 0, 20 and bit 23 have to be zero, otherwise an specification
|
|
* exception will occur instead of a page translation exception. The
|
|
* specifiation exception has the bad habit not to store necessary
|
|
* information in the lowcore.
|
|
* Bit 21 and bit 22 are the page invalid bit and the page protection
|
|
* bit. We set both to indicate a swapped page.
|
|
* Bit 30 and 31 are used to distinguish the different page types. For
|
|
* a swapped page these bits need to be zero.
|
|
* This leaves the bits 1-19 and bits 24-29 to store type and offset.
|
|
* We use the 5 bits from 25-29 for the type and the 20 bits from 1-19
|
|
* plus 24 for the offset.
|
|
* 0| offset |0110|o|type |00|
|
|
* 0 0000000001111111111 2222 2 22222 33
|
|
* 0 1234567890123456789 0123 4 56789 01
|
|
*
|
|
* 64 bit swap entry format:
|
|
* A page-table entry has some bits we have to treat in a special way.
|
|
* Bits 52 and bit 55 have to be zero, otherwise an specification
|
|
* exception will occur instead of a page translation exception. The
|
|
* specifiation exception has the bad habit not to store necessary
|
|
* information in the lowcore.
|
|
* Bit 53 and bit 54 are the page invalid bit and the page protection
|
|
* bit. We set both to indicate a swapped page.
|
|
* Bit 62 and 63 are used to distinguish the different page types. For
|
|
* a swapped page these bits need to be zero.
|
|
* This leaves the bits 0-51 and bits 56-61 to store type and offset.
|
|
* We use the 5 bits from 57-61 for the type and the 53 bits from 0-51
|
|
* plus 56 for the offset.
|
|
* | offset |0110|o|type |00|
|
|
* 0000000000111111111122222222223333333333444444444455 5555 5 55566 66
|
|
* 0123456789012345678901234567890123456789012345678901 2345 6 78901 23
|
|
*/
|
|
#ifndef __s390x__
|
|
#define __SWP_OFFSET_MASK (~0UL >> 12)
|
|
#else
|
|
#define __SWP_OFFSET_MASK (~0UL >> 11)
|
|
#endif
|
|
static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
|
|
{
|
|
pte_t pte;
|
|
offset &= __SWP_OFFSET_MASK;
|
|
pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) |
|
|
((offset & 1UL) << 7) | ((offset & ~1UL) << 11);
|
|
return pte;
|
|
}
|
|
|
|
#define __swp_type(entry) (((entry).val >> 2) & 0x1f)
|
|
#define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1))
|
|
#define __swp_entry(type,offset) ((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 })
|
|
|
|
#ifndef __s390x__
|
|
# define PTE_FILE_MAX_BITS 26
|
|
#else /* __s390x__ */
|
|
# define PTE_FILE_MAX_BITS 59
|
|
#endif /* __s390x__ */
|
|
|
|
#define pte_to_pgoff(__pte) \
|
|
((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f))
|
|
|
|
#define pgoff_to_pte(__off) \
|
|
((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \
|
|
| _PAGE_TYPE_FILE })
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#define kern_addr_valid(addr) (1)
|
|
|
|
extern int vmem_add_mapping(unsigned long start, unsigned long size);
|
|
extern int vmem_remove_mapping(unsigned long start, unsigned long size);
|
|
extern int s390_enable_sie(void);
|
|
|
|
/*
|
|
* No page table caches to initialise
|
|
*/
|
|
#define pgtable_cache_init() do { } while (0)
|
|
|
|
#include <asm-generic/pgtable.h>
|
|
|
|
#endif /* _S390_PAGE_H */
|