include/xen/interface/memory.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /******************************************************************************
   3  * memory.h
   4  *
   5  * Memory reservation and information.
   6  *
   7  * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
   8  */
   9
  10 #ifndef __XEN_PUBLIC_MEMORY_H__
  11 #define __XEN_PUBLIC_MEMORY_H__
  12
  13 #include <linux/spinlock.h>
  14
  15 /*
  16  * Increase or decrease the specified domain's memory reservation. Returns a
  17  * -ve errcode on failure, or the # extents successfully allocated or freed.
  18  * arg == addr of struct xen_memory_reservation.
  19  */
  20 #define XENMEM_increase_reservation 0
  21 #define XENMEM_decrease_reservation 1
  22 #define XENMEM_populate_physmap     6
  23 struct xen_memory_reservation {
  24
  25     /*
  26      * XENMEM_increase_reservation:
  27      *   OUT: MFN (*not* GMFN) bases of extents that were allocated
  28      * XENMEM_decrease_reservation:
  29      *   IN:  GMFN bases of extents to free
  30      * XENMEM_populate_physmap:
  31      *   IN:  GPFN bases of extents to populate with memory
  32      *   OUT: GMFN bases of extents that were allocated
  33      *   (NB. This command also updates the mach_to_phys translation table)
  34      */
  35     GUEST_HANDLE(xen_pfn_t) extent_start;
  36
  37     /* Number of extents, and size/alignment of each (2^extent_order pages). */
  38     xen_ulong_t  nr_extents;
  39     unsigned int   extent_order;
  40
  41     /*
  42      * Maximum # bits addressable by the user of the allocated region (e.g.,
  43      * I/O devices often have a 32-bit limitation even in 64-bit systems). If
  44      * zero then the user has no addressing restriction.
  45      * This field is not used by XENMEM_decrease_reservation.
  46      */
  47     unsigned int   address_bits;
  48
  49     /*
  50      * Domain whose reservation is being changed.
  51      * Unprivileged domains can specify only DOMID_SELF.
  52      */
  53     domid_t        domid;
  54
  55 };
  56 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);
  57
  58 /*
  59  * An atomic exchange of memory pages. If return code is zero then
  60  * @out.extent_list provides GMFNs of the newly-allocated memory.
  61  * Returns zero on complete success, otherwise a negative error code.
  62  * On complete success then always @nr_exchanged == @in.nr_extents.
  63  * On partial success @nr_exchanged indicates how much work was done.
  64  */
  65 #define XENMEM_exchange             11
  66 struct xen_memory_exchange {
  67     /*
  68      * [IN] Details of memory extents to be exchanged (GMFN bases).
  69      * Note that @in.address_bits is ignored and unused.
  70      */
  71     struct xen_memory_reservation in;
  72
  73     /*
  74      * [IN/OUT] Details of new memory extents.
  75      * We require that:
  76      *  1. @in.domid == @out.domid
  77      *  2. @in.nr_extents  << @in.extent_order ==
  78      *     @out.nr_extents << @out.extent_order
  79      *  3. @in.extent_start and @out.extent_start lists must not overlap
  80      *  4. @out.extent_start lists GPFN bases to be populated
  81      *  5. @out.extent_start is overwritten with allocated GMFN bases
  82      */
  83     struct xen_memory_reservation out;
  84
  85     /*
  86      * [OUT] Number of input extents that were successfully exchanged:
  87      *  1. The first @nr_exchanged input extents were successfully
  88      *     deallocated.
  89      *  2. The corresponding first entries in the output extent list correctly
  90      *     indicate the GMFNs that were successfully exchanged.
  91      *  3. All other input and output extents are untouched.
  92      *  4. If not all input exents are exchanged then the return code of this
  93      *     command will be non-zero.
  94      *  5. THIS FIELD MUST BE INITIALISED TO ZERO BY THE CALLER!
  95      */
  96     xen_ulong_t nr_exchanged;
  97 };
  98
  99 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_exchange);
 100 /*
 101  * Returns the maximum machine frame number of mapped RAM in this system.
 102  * This command always succeeds (it never returns an error code).
 103  * arg == NULL.
 104  */
 105 #define XENMEM_maximum_ram_page     2
 106
 107 /*
 108  * Returns the current or maximum memory reservation, in pages, of the
 109  * specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
 110  * arg == addr of domid_t.
 111  */
 112 #define XENMEM_current_reservation  3
 113 #define XENMEM_maximum_reservation  4
 114
 115 /*
 116  * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
 117  * mapping table. Architectures which do not have a m2p table do not implement
 118  * this command.
 119  * arg == addr of xen_machphys_mfn_list_t.
 120  */
 121 #define XENMEM_machphys_mfn_list    5
 122 struct xen_machphys_mfn_list {
 123     /*
 124      * Size of the 'extent_start' array. Fewer entries will be filled if the
 125      * machphys table is smaller than max_extents * 2MB.
 126      */
 127     unsigned int max_extents;
 128
 129     /*
 130      * Pointer to buffer to fill with list of extent starts. If there are
 131      * any large discontiguities in the machine address space, 2MB gaps in
 132      * the machphys table will be represented by an MFN base of zero.
 133      */
 134     GUEST_HANDLE(xen_pfn_t) extent_start;
 135
 136     /*
 137      * Number of extents written to the above array. This will be smaller
 138      * than 'max_extents' if the machphys table is smaller than max_e * 2MB.
 139      */
 140     unsigned int nr_extents;
 141 };
 142 DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);
 143
 144 /*
 145  * Returns the location in virtual address space of the machine_to_phys
 146  * mapping table. Architectures which do not have a m2p table, or which do not
 147  * map it by default into guest address space, do not implement this command.
 148  * arg == addr of xen_machphys_mapping_t.
 149  */
 150 #define XENMEM_machphys_mapping     12
 151 struct xen_machphys_mapping {
 152     xen_ulong_t v_start, v_end; /* Start and end virtual addresses.   */
 153     xen_ulong_t max_mfn;        /* Maximum MFN that can be looked up. */
 154 };
 155 DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
 156
 157 #define XENMAPSPACE_shared_info  0 /* shared info page */
 158 #define XENMAPSPACE_grant_table  1 /* grant table page */
 159 #define XENMAPSPACE_gmfn         2 /* GMFN */
 160 #define XENMAPSPACE_gmfn_range   3 /* GMFN range, XENMEM_add_to_physmap only. */
 161 #define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
 162                                     * XENMEM_add_to_physmap_range only.
 163                                     */
 164 #define XENMAPSPACE_dev_mmio     5 /* device mmio region */
 165
 166 /*
 167  * Sets the GPFN at which a particular page appears in the specified guest's
 168  * pseudophysical address space.
 169  * arg == addr of xen_add_to_physmap_t.
 170  */
 171 #define XENMEM_add_to_physmap      7
 172 struct xen_add_to_physmap {
 173     /* Which domain to change the mapping for. */
 174     domid_t domid;
 175
 176     /* Number of pages to go through for gmfn_range */
 177     uint16_t    size;
 178
 179     /* Source mapping space. */
 180     unsigned int space;
 181
 182     /* Index into source mapping space. */
 183     xen_ulong_t idx;
 184
 185     /* GPFN where the source mapping page should appear. */
 186     xen_pfn_t gpfn;
 187 };
 188 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
 189
 190 /*** REMOVED ***/
 191 /*#define XENMEM_translate_gpfn_list  8*/
 192
 193 #define XENMEM_add_to_physmap_range 23
 194 struct xen_add_to_physmap_range {
 195     /* IN */
 196     /* Which domain to change the mapping for. */
 197     domid_t domid;
 198     uint16_t space; /* => enum phys_map_space */
 199
 200     /* Number of pages to go through */
 201     uint16_t size;
 202     domid_t foreign_domid; /* IFF gmfn_foreign */
 203
 204     /* Indexes into space being mapped. */
 205     GUEST_HANDLE(xen_ulong_t) idxs;
 206
 207     /* GPFN in domid where the source mapping page should appear. */
 208     GUEST_HANDLE(xen_pfn_t) gpfns;
 209
 210     /* OUT */
 211
 212     /* Per index error code. */
 213     GUEST_HANDLE(int) errs;
 214 };
 215 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
 216
 217 /*
 218  * Returns the pseudo-physical memory map as it was when the domain
 219  * was started (specified by XENMEM_set_memory_map).
 220  * arg == addr of struct xen_memory_map.
 221  */
 222 #define XENMEM_memory_map           9
 223 struct xen_memory_map {
 224     /*
 225      * On call the number of entries which can be stored in buffer. On
 226      * return the number of entries which have been stored in
 227      * buffer.
 228      */
 229     unsigned int nr_entries;
 230
 231     /*
 232      * Entries in the buffer are in the same format as returned by the
 233      * BIOS INT 0x15 EAX=0xE820 call.
 234      */
 235     GUEST_HANDLE(void) buffer;
 236 };
 237 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
 238
 239 /*
 240  * Returns the real physical memory map. Passes the same structure as
 241  * XENMEM_memory_map.
 242  * arg == addr of struct xen_memory_map.
 243  */
 244 #define XENMEM_machine_memory_map   10
 245
 246
 247 /*
 248  * Prevent the balloon driver from changing the memory reservation
 249  * during a driver critical region.
 250  */
 251 extern spinlock_t xen_reservation_lock;
 252
 253 /*
 254  * Unmaps the page appearing at a particular GPFN from the specified guest's
 255  * pseudophysical address space.
 256  * arg == addr of xen_remove_from_physmap_t.
 257  */
 258 #define XENMEM_remove_from_physmap      15
 259 struct xen_remove_from_physmap {
 260     /* Which domain to change the mapping for. */
 261     domid_t domid;
 262
 263     /* GPFN of the current mapping of the page. */
 264     xen_pfn_t gpfn;
 265 };
 266 DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
 267
 268 #endif /* __XEN_PUBLIC_MEMORY_H__ */