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usr
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src
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linux-headers-6.8.0-83-generic
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arch
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s390
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include
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asm
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gmap.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * KVM guest address space mapping code * * Copyright IBM Corp. 2007, 2016 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> */ #ifndef _ASM_S390_GMAP_H #define _ASM_S390_GMAP_H #include <linux/radix-tree.h> #include <linux/refcount.h> /* Generic bits for GMAP notification on DAT table entry changes. */ #define GMAP_NOTIFY_SHADOW 0x2 #define GMAP_NOTIFY_MPROT 0x1 /* Status bits only for huge segment entries */ #define _SEGMENT_ENTRY_GMAP_IN 0x8000 /* invalidation notify bit */ #define _SEGMENT_ENTRY_GMAP_UC 0x4000 /* dirty (migration) */ /** * struct gmap_struct - guest address space * @list: list head for the mm->context gmap list * @crst_list: list of all crst tables used in the guest address space * @mm: pointer to the parent mm_struct * @guest_to_host: radix tree with guest to host address translation * @host_to_guest: radix tree with pointer to segment table entries * @guest_table_lock: spinlock to protect all entries in the guest page table * @ref_count: reference counter for the gmap structure * @table: pointer to the page directory * @asce: address space control element for gmap page table * @pfault_enabled: defines if pfaults are applicable for the guest * @guest_handle: protected virtual machine handle for the ultravisor * @host_to_rmap: radix tree with gmap_rmap lists * @children: list of shadow gmap structures * @pt_list: list of all page tables used in the shadow guest address space * @shadow_lock: spinlock to protect the shadow gmap list * @parent: pointer to the parent gmap for shadow guest address spaces * @orig_asce: ASCE for which the shadow page table has been created * @edat_level: edat level to be used for the shadow translation * @removed: flag to indicate if a shadow guest address space has been removed * @initialized: flag to indicate if a shadow guest address space can be used */ struct gmap { struct list_head list; struct list_head crst_list; struct mm_struct *mm; struct radix_tree_root guest_to_host; struct radix_tree_root host_to_guest; spinlock_t guest_table_lock; refcount_t ref_count; unsigned long *table; unsigned long asce; unsigned long asce_end; void *private; bool pfault_enabled; /* only set for protected virtual machines */ unsigned long guest_handle; /* Additional data for shadow guest address spaces */ struct radix_tree_root host_to_rmap; struct list_head children; struct list_head pt_list; spinlock_t shadow_lock; struct gmap *parent; unsigned long orig_asce; int edat_level; bool removed; bool initialized; }; /** * struct gmap_rmap - reverse mapping for shadow page table entries * @next: pointer to next rmap in the list * @raddr: virtual rmap address in the shadow guest address space */ struct gmap_rmap { struct gmap_rmap *next; unsigned long raddr; }; #define gmap_for_each_rmap(pos, head) \ for (pos = (head); pos; pos = pos->next) #define gmap_for_each_rmap_safe(pos, n, head) \ for (pos = (head); n = pos ? pos->next : NULL, pos; pos = n) /** * struct gmap_notifier - notify function block for page invalidation * @notifier_call: address of callback function */ struct gmap_notifier { struct list_head list; struct rcu_head rcu; void (*notifier_call)(struct gmap *gmap, unsigned long start, unsigned long end); }; static inline int gmap_is_shadow(struct gmap *gmap) { return !!gmap->parent; } struct gmap *gmap_create(struct mm_struct *mm, unsigned long limit); void gmap_remove(struct gmap *gmap); struct gmap *gmap_get(struct gmap *gmap); void gmap_put(struct gmap *gmap); void gmap_enable(struct gmap *gmap); void gmap_disable(struct gmap *gmap); struct gmap *gmap_get_enabled(void); int gmap_map_segment(struct gmap *gmap, unsigned long from, unsigned long to, unsigned long len); int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len); unsigned long __gmap_translate(struct gmap *, unsigned long gaddr); unsigned long gmap_translate(struct gmap *, unsigned long gaddr); int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr); int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags); void gmap_discard(struct gmap *, unsigned long from, unsigned long to); void __gmap_zap(struct gmap *, unsigned long gaddr); void gmap_unlink(struct mm_struct *, unsigned long *table, unsigned long vmaddr); int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val); struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, int edat_level); int gmap_shadow_valid(struct gmap *sg, unsigned long asce, int edat_level); int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, int fake); int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, int fake); int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, int fake); int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, int fake); int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, unsigned long *pgt, int *dat_protection, int *fake); int gmap_shadow_page(struct gmap *sg, unsigned long saddr, pte_t pte); void gmap_register_pte_notifier(struct gmap_notifier *); void gmap_unregister_pte_notifier(struct gmap_notifier *); int gmap_mprotect_notify(struct gmap *, unsigned long start, unsigned long len, int prot); void gmap_sync_dirty_log_pmd(struct gmap *gmap, unsigned long dirty_bitmap[4], unsigned long gaddr, unsigned long vmaddr); int s390_disable_cow_sharing(void); void s390_unlist_old_asce(struct gmap *gmap); int s390_replace_asce(struct gmap *gmap); void s390_uv_destroy_pfns(unsigned long count, unsigned long *pfns); int __s390_uv_destroy_range(struct mm_struct *mm, unsigned long start, unsigned long end, bool interruptible); /** * s390_uv_destroy_range - Destroy a range of pages in the given mm. * @mm: the mm on which to operate on * @start: the start of the range * @end: the end of the range * * This function will call cond_sched, so it should not generate stalls, but * it will otherwise only return when it completed. */ static inline void s390_uv_destroy_range(struct mm_struct *mm, unsigned long start, unsigned long end) { (void)__s390_uv_destroy_range(mm, start, end, false); } /** * s390_uv_destroy_range_interruptible - Destroy a range of pages in the * given mm, but stop when a fatal signal is received. * @mm: the mm on which to operate on * @start: the start of the range * @end: the end of the range * * This function will call cond_sched, so it should not generate stalls. If * a fatal signal is received, it will return with -EINTR immediately, * without finishing destroying the whole range. Upon successful * completion, 0 is returned. */ static inline int s390_uv_destroy_range_interruptible(struct mm_struct *mm, unsigned long start, unsigned long end) { return __s390_uv_destroy_range(mm, start, end, true); } #endif /* _ASM_S390_GMAP_H */
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