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__ */ 269