LXR linux/include/linux/kvm

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2
   3#ifndef __KVM_TYPES_H__
   4#define __KVM_TYPES_H__
   5
   6struct kvm;
   7struct kvm_async_pf;
   8struct kvm_device_ops;
   9struct kvm_interrupt;
  10struct kvm_irq_routing_table;
  11struct kvm_memory_slot;
  12struct kvm_one_reg;
  13struct kvm_run;
  14struct kvm_userspace_memory_region;
  15struct kvm_vcpu;
  16struct kvm_vcpu_init;
  17struct kvm_memslots;
  18
  19enum 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
  36typedef unsigned long  gva_t;
  37typedef u64            gpa_t;
  38typedef u64            gfn_t;
  39
  40#define GPA_INVALID     (~(gpa_t)0)
  41
  42typedef unsigned long  hva_t;
  43typedef u64            hpa_t;
  44typedef u64            hfn_t;
  45
  46typedef hfn_t kvm_pfn_t;
  47
  48struct 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
  56struct 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 */
  71struct 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__ */
  81