include/linux/kvm_types.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef __KVM_TYPES_H__
   4 #define __KVM_TYPES_H__
   5
   6 struct kvm;
   7 struct kvm_async_pf;
   8 struct kvm_device_ops;
   9 struct kvm_interrupt;
  10 struct kvm_irq_routing_table;
  11 struct kvm_memory_slot;
  12 struct kvm_one_reg;
  13 struct kvm_run;
  14 struct kvm_userspace_memory_region;
  15 struct kvm_vcpu;
  16 struct kvm_vcpu_init;
  17 struct kvm_memslots;
  18
  19 enum kvm_mr_change;
  20
  21 #include <linux/types.h>
  22
  23 #include <asm/kvm_types.h>
  24
  25 /*
  26  * Address types:
  27  *
  28  *  gva - guest virtual address
  29  *  gpa - guest physical address
  30  *  gfn - guest frame number
  31  *  hva - host virtual address
  32  *  hpa - host physical address
  33  *  hfn - host frame number
  34  */
  35
  36 typedef unsigned long  gva_t;
  37 typedef u64            gpa_t;
  38 typedef u64            gfn_t;
  39
  40 #define GPA_INVALID     (~(gpa_t)0)
  41
  42 typedef unsigned long  hva_t;
  43 typedef u64            hpa_t;
  44 typedef u64            hfn_t;
  45
  46 typedef hfn_t kvm_pfn_t;
  47
  48 struct gfn_to_hva_cache {
  49         u64 generation;
  50         gpa_t gpa;
  51         unsigned long hva;
  52         unsigned long len;
  53         struct kvm_memory_slot *memslot;
  54 };
  55
  56 struct gfn_to_pfn_cache {
  57         u64 generation;
  58         gfn_t gfn;
  59         kvm_pfn_t pfn;
  60         bool dirty;
  61 };
  62
  63 #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
  64 /*
  65  * Memory caches are used to preallocate memory ahead of various MMU flows,
  66  * e.g. page fault handlers.  Gracefully handling allocation failures deep in
  67  * MMU flows is problematic, as is triggering reclaim, I/O, etc... while
  68  * holding MMU locks.  Note, these caches act more like prefetch buffers than
  69  * classical caches, i.e. objects are not returned to the cache on being freed.
  70  */
  71 struct kvm_mmu_memory_cache {
  72         int nobjs;
  73         gfp_t gfp_zero;
  74         struct kmem_cache *kmem_cache;
  75         void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
  76 };
  77 #endif
  78
  79
  80 #endif /* __KVM_TYPES_H__ */