include/xen/interface/memory.h

   1 /******************************************************************************
   2  * memory.h
   3  *
   4  * Memory reservation and information.
   5  *
   6  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
   7  */
   8
   9 #ifndef __XEN_PUBLIC_MEMORY_H__
  10 #define __XEN_PUBLIC_MEMORY_H__
  11
  12 /*
  13  * Increase or decrease the specified domain's memory reservation. Returns a
  14  * -ve errcode on failure, or the # extents successfully allocated or freed.
  15  * arg == addr of struct xen_memory_reservation.
  16  */
  17 #define XENMEM_increase_reservation 0
  18 #define XENMEM_decrease_reservation 1
  19 #define XENMEM_populate_physmap     6
  20 struct xen_memory_reservation {
  21
  22     /*
  23      * XENMEM_increase_reservation:
  24      *   OUT: MFN (*not* GMFN) bases of extents that were allocated
  25      * XENMEM_decrease_reservation:
  26      *   IN:  GMFN bases of extents to free
  27      * XENMEM_populate_physmap:
  28      *   IN:  GPFN bases of extents to populate with memory
  29      *   OUT: GMFN bases of extents that were allocated
  30      *   (NB. This command also updates the mach_to_phys translation table)
  31      */
  32     GUEST_HANDLE(ulong) extent_start;
  33
  34     /* Number of extents, and size/alignment of each (2^extent_order pages). */
  35     unsigned long  nr_extents;
  36     unsigned int   extent_order;
  37
  38     /*
  39      * Maximum # bits addressable by the user of the allocated region (e.g.,
  40      * I/O devices often have a 32-bit limitation even in 64-bit systems). If
  41      * zero then the user has no addressing restriction.
  42      * This field is not used by XENMEM_decrease_reservation.
  43      */
  44     unsigned int   address_bits;
  45
  46     /*
  47      * Domain whose reservation is being changed.
  48      * Unprivileged domains can specify only DOMID_SELF.
  49      */
  50     domid_t        domid;
  51
  52 };
  53 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
  54
  55 /*
  56  * Returns the maximum machine frame number of mapped RAM in this system.
  57  * This command always succeeds (it never returns an error code).
  58  * arg == NULL.
  59  */
  60 #define XENMEM_maximum_ram_page     2
  61
  62 /*
  63  * Returns the current or maximum memory reservation, in pages, of the
  64  * specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
  65  * arg == addr of domid_t.
  66  */
  67 #define XENMEM_current_reservation  3
  68 #define XENMEM_maximum_reservation  4
  69
  70 /*
  71  * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
  72  * mapping table. Architectures which do not have a m2p table do not implement
  73  * this command.
  74  * arg == addr of xen_machphys_mfn_list_t.
  75  */
  76 #define XENMEM_machphys_mfn_list    5
  77 struct xen_machphys_mfn_list {
  78     /*
  79      * Size of the 'extent_start' array. Fewer entries will be filled if the
  80      * machphys table is smaller than max_extents * 2MB.
  81      */
  82     unsigned int max_extents;
  83
  84     /*
  85      * Pointer to buffer to fill with list of extent starts. If there are
  86      * any large discontiguities in the machine address space, 2MB gaps in
  87      * the machphys table will be represented by an MFN base of zero.
  88      */
  89     GUEST_HANDLE(ulong) extent_start;
  90
  91     /*
  92      * Number of extents written to the above array. This will be smaller
  93      * than 'max_extents' if the machphys table is smaller than max_e * 2MB.
  94      */
  95     unsigned int nr_extents;
  96 };
  97 DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
  98
  99 /*
 100  * Sets the GPFN at which a particular page appears in the specified guest's
 101  * pseudophysical address space.
 102  * arg == addr of xen_add_to_physmap_t.
 103  */
 104 #define XENMEM_add_to_physmap      7
 105 struct xen_add_to_physmap {
 106     /* Which domain to change the mapping for. */
 107     domid_t domid;
 108
 109     /* Source mapping space. */
 110 #define XENMAPSPACE_shared_info 0 /* shared info page */
 111 #define XENMAPSPACE_grant_table 1 /* grant table page */
 112     unsigned int space;
 113
 114     /* Index into source mapping space. */
 115     unsigned long idx;
 116
 117     /* GPFN where the source mapping page should appear. */
 118     unsigned long gpfn;
 119 };
 120 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
 121
 122 /*
 123  * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
 124  * code on failure. This call only works for auto-translated guests.
 125  */
 126 #define XENMEM_translate_gpfn_list  8
 127 struct xen_translate_gpfn_list {
 128     /* Which domain to translate for? */
 129     domid_t domid;
 130
 131     /* Length of list. */
 132     unsigned long nr_gpfns;
 133
 134     /* List of GPFNs to translate. */
 135     GUEST_HANDLE(ulong) gpfn_list;
 136
 137     /*
 138      * Output list to contain MFN translations. May be the same as the input
 139      * list (in which case each input GPFN is overwritten with the output MFN).
 140      */
 141     GUEST_HANDLE(ulong) mfn_list;
 142 };
 143 DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);
 144
 145 #endif /* __XEN_PUBLIC_MEMORY_H__ */