LXR linux/include/linux/kvm

   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License as published by
   4 * the Free Software Foundation; either version 2 of the License.
   5 *
   6 * This program is distributed in the hope that it will be useful,
   7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 * GNU General Public License for more details.
  10 *
  11 * You should have received a copy of the GNU General Public License
  12 * along with this program; if not, write to the Free Software
  13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14 *
  15 */
  16
  17#ifndef __KVM_TYPES_H__
  18#define __KVM_TYPES_H__
  19
  20struct kvm;
  21struct kvm_async_pf;
  22struct kvm_device_ops;
  23struct kvm_interrupt;
  24struct kvm_irq_routing_table;
  25struct kvm_memory_slot;
  26struct kvm_one_reg;
  27struct kvm_run;
  28struct kvm_userspace_memory_region;
  29struct kvm_vcpu;
  30struct kvm_vcpu_init;
  31struct kvm_memslots;
  32
  33enum kvm_mr_change;
  34
  35#include <linux/types.h>
  36
  37#include <asm/kvm_types.h>
  38
  39/*
  40 * Address types:
  41 *
  42 *  gva - guest virtual address
  43 *  gpa - guest physical address
  44 *  gfn - guest frame number
  45 *  hva - host virtual address
  46 *  hpa - host physical address
  47 *  hfn - host frame number
  48 */
  49
  50typedef unsigned long  gva_t;
  51typedef u64            gpa_t;
  52typedef u64            gfn_t;
  53
  54#define GPA_INVALID     (~(gpa_t)0)
  55
  56typedef unsigned long  hva_t;
  57typedef u64            hpa_t;
  58typedef u64            hfn_t;
  59
  60typedef hfn_t kvm_pfn_t;
  61
  62struct gfn_to_hva_cache {
  63        u64 generation;
  64        gpa_t gpa;
  65        unsigned long hva;
  66        unsigned long len;
  67        struct kvm_memory_slot *memslot;
  68};
  69
  70struct gfn_to_pfn_cache {
  71        u64 generation;
  72        gfn_t gfn;
  73        kvm_pfn_t pfn;
  74        bool dirty;
  75};
  76
  77#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
  78/*
  79 * Memory caches are used to preallocate memory ahead of various MMU flows,
  80 * e.g. page fault handlers.  Gracefully handling allocation failures deep in
  81 * MMU flows is problematic, as is triggering reclaim, I/O, etc... while
  82 * holding MMU locks.  Note, these caches act more like prefetch buffers than
  83 * classical caches, i.e. objects are not returned to the cache on being freed.
  84 */
  85struct kvm_mmu_memory_cache {
  86        int nobjs;
  87        gfp_t gfp_zero;
  88        struct kmem_cache *kmem_cache;
  89        void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
  90};
  91#endif
  92
  93
  94#endif /* __KVM_TYPES_H__ */
  95