release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/spinlock.h>
  13
  14 /*
  15  * Increase or decrease the specified domain's memory reservation. Returns a
  16  * -ve errcode on failure, or the # extents successfully allocated or freed.
  17  * arg == addr of struct xen_memory_reservation.
  18  */
  19 #define XENMEM_increase_reservation 0
  20 #define XENMEM_decrease_reservation 1
  21 #define XENMEM_populate_physmap     6
  22 struct xen_memory_reservation {
  23
  24     /*
  25      * XENMEM_increase_reservation:
  26      *   OUT: MFN (*not* GMFN) bases of extents that were allocated
  27      * XENMEM_decrease_reservation:
  28      *   IN:  GMFN bases of extents to free
  29      * XENMEM_populate_physmap:
  30      *   IN:  GPFN bases of extents to populate with memory
  31      *   OUT: GMFN bases of extents that were allocated
  32      *   (NB. This command also updates the mach_to_phys translation table)
  33      */
  34     GUEST_HANDLE(ulong) extent_start;
  35
  36     /* Number of extents, and size/alignment of each (2^extent_order pages). */
  37     unsigned long  nr_extents;
  38     unsigned int   extent_order;
  39
  40     /*
  41      * Maximum # bits addressable by the user of the allocated region (e.g.,
  42      * I/O devices often have a 32-bit limitation even in 64-bit systems). If
  43      * zero then the user has no addressing restriction.
  44      * This field is not used by XENMEM_decrease_reservation.
  45      */
  46     unsigned int   address_bits;
  47
  48     /*
  49      * Domain whose reservation is being changed.
  50      * Unprivileged domains can specify only DOMID_SELF.
  51      */
  52     domid_t        domid;
  53
  54 };
  55 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
  56
  57 /*
  58  * An atomic exchange of memory pages. If return code is zero then
  59  * @out.extent_list provides GMFNs of the newly-allocated memory.
  60  * Returns zero on complete success, otherwise a negative error code.
  61  * On complete success then always @nr_exchanged == @in.nr_extents.
  62  * On partial success @nr_exchanged indicates how much work was done.
  63  */
  64 #define XENMEM_exchange             11
  65 struct xen_memory_exchange {
  66     /*
  67      * [IN] Details of memory extents to be exchanged (GMFN bases).
  68      * Note that @in.address_bits is ignored and unused.
  69      */
  70     struct xen_memory_reservation in;
  71
  72     /*
  73      * [IN/OUT] Details of new memory extents.
  74      * We require that:
  75      *  1. @in.domid == @out.domid
  76      *  2. @in.nr_extents  << @in.extent_order ==
  77      *     @out.nr_extents << @out.extent_order
  78      *  3. @in.extent_start and @out.extent_start lists must not overlap
  79      *  4. @out.extent_start lists GPFN bases to be populated
  80      *  5. @out.extent_start is overwritten with allocated GMFN bases
  81      */
  82     struct xen_memory_reservation out;
  83
  84     /*
  85      * [OUT] Number of input extents that were successfully exchanged:
  86      *  1. The first @nr_exchanged input extents were successfully
  87      *     deallocated.
  88      *  2. The corresponding first entries in the output extent list correctly
  89      *     indicate the GMFNs that were successfully exchanged.
  90      *  3. All other input and output extents are untouched.
  91      *  4. If not all input exents are exchanged then the return code of this
  92      *     command will be non-zero.
  93      *  5. THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER!
  94      */
  95     unsigned long nr_exchanged;
  96 };
  97
  98 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
  99 /*
 100  * Returns the maximum machine frame number of mapped RAM in this system.
 101  * This command always succeeds (it never returns an error code).
 102  * arg == NULL.
 103  */
 104 #define XENMEM_maximum_ram_page     2
 105
 106 /*
 107  * Returns the current or maximum memory reservation, in pages, of the
 108  * specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
 109  * arg == addr of domid_t.
 110  */
 111 #define XENMEM_current_reservation  3
 112 #define XENMEM_maximum_reservation  4
 113
 114 /*
 115  * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
 116  * mapping table. Architectures which do not have a m2p table do not implement
 117  * this command.
 118  * arg == addr of xen_machphys_mfn_list_t.
 119  */
 120 #define XENMEM_machphys_mfn_list    5
 121 struct xen_machphys_mfn_list {
 122     /*
 123      * Size of the 'extent_start' array. Fewer entries will be filled if the
 124      * machphys table is smaller than max_extents * 2MB.
 125      */
 126     unsigned int max_extents;
 127
 128     /*
 129      * Pointer to buffer to fill with list of extent starts. If there are
 130      * any large discontiguities in the machine address space, 2MB gaps in
 131      * the machphys table will be represented by an MFN base of zero.
 132      */
 133     GUEST_HANDLE(ulong) extent_start;
 134
 135     /*
 136      * Number of extents written to the above array. This will be smaller
 137      * than 'max_extents' if the machphys table is smaller than max_e * 2MB.
 138      */
 139     unsigned int nr_extents;
 140 };
 141 DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
 142
 143 /*
 144  * Sets the GPFN at which a particular page appears in the specified guest's
 145  * pseudophysical address space.
 146  * arg == addr of xen_add_to_physmap_t.
 147  */
 148 #define XENMEM_add_to_physmap      7
 149 struct xen_add_to_physmap {
 150     /* Which domain to change the mapping for. */
 151     domid_t domid;
 152
 153     /* Source mapping space. */
 154 #define XENMAPSPACE_shared_info 0 /* shared info page */
 155 #define XENMAPSPACE_grant_table 1 /* grant table page */
 156     unsigned int space;
 157
 158     /* Index into source mapping space. */
 159     unsigned long idx;
 160
 161     /* GPFN where the source mapping page should appear. */
 162     unsigned long gpfn;
 163 };
 164 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
 165
 166 /*
 167  * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
 168  * code on failure. This call only works for auto-translated guests.
 169  */
 170 #define XENMEM_translate_gpfn_list  8
 171 struct xen_translate_gpfn_list {
 172     /* Which domain to translate for? */
 173     domid_t domid;
 174
 175     /* Length of list. */
 176     unsigned long nr_gpfns;
 177
 178     /* List of GPFNs to translate. */
 179     GUEST_HANDLE(ulong) gpfn_list;
 180
 181     /*
 182      * Output list to contain MFN translations. May be the same as the input
 183      * list (in which case each input GPFN is overwritten with the output MFN).
 184      */
 185     GUEST_HANDLE(ulong) mfn_list;
 186 };
 187 DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);
 188
 189
 190 /*
 191  * Prevent the balloon driver from changing the memory reservation
 192  * during a driver critical region.
 193  */
 194 extern spinlock_t xen_reservation_lock;
 195 #endif /* __XEN_PUBLIC_MEMORY_H__ */