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 22struct 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(xen_pfn_t) extent_start; 35 36 /* Number of extents, and size/alignment of each (2^extent_order pages). */ 37 xen_ulong_t 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}; 55DEFINE_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 65struct 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 xen_ulong_t nr_exchanged; 96}; 97 98DEFINE_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 121struct 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(xen_pfn_t) 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}; 141DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list); 142 143/* 144 * Returns the location in virtual address space of the machine_to_phys 145 * mapping table. Architectures which do not have a m2p table, or which do not 146 * map it by default into guest address space, do not implement this command. 147 * arg == addr of xen_machphys_mapping_t. 148 */ 149#define XENMEM_machphys_mapping 12 150struct xen_machphys_mapping { 151 xen_ulong_t v_start, v_end; /* Start and end virtual addresses. */ 152 xen_ulong_t max_mfn; /* Maximum MFN that can be looked up. */ 153}; 154DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t); 155 156#define XENMAPSPACE_shared_info 0 /* shared info page */ 157#define XENMAPSPACE_grant_table 1 /* grant table page */ 158#define XENMAPSPACE_gmfn 2 /* GMFN */ 159#define XENMAPSPACE_gmfn_range 3 /* GMFN range, XENMEM_add_to_physmap only. */ 160#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom, 161 * XENMEM_add_to_physmap_range only. 162 */ 163 164/* 165 * Sets the GPFN at which a particular page appears in the specified guest's 166 * pseudophysical address space. 167 * arg == addr of xen_add_to_physmap_t. 168 */ 169#define XENMEM_add_to_physmap 7 170struct xen_add_to_physmap { 171 /* Which domain to change the mapping for. */ 172 domid_t domid; 173 174 /* Number of pages to go through for gmfn_range */ 175 uint16_t size; 176 177 /* Source mapping space. */ 178 unsigned int space; 179 180 /* Index into source mapping space. */ 181 xen_ulong_t idx; 182 183 /* GPFN where the source mapping page should appear. */ 184 xen_pfn_t gpfn; 185}; 186DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap); 187 188/*** REMOVED ***/ 189/*#define XENMEM_translate_gpfn_list 8*/ 190 191#define XENMEM_add_to_physmap_range 23 192struct xen_add_to_physmap_range { 193 /* IN */ 194 /* Which domain to change the mapping for. */ 195 domid_t domid; 196 uint16_t space; /* => enum phys_map_space */ 197 198 /* Number of pages to go through */ 199 uint16_t size; 200 domid_t foreign_domid; /* IFF gmfn_foreign */ 201 202 /* Indexes into space being mapped. */ 203 GUEST_HANDLE(xen_ulong_t) idxs; 204 205 /* GPFN in domid where the source mapping page should appear. */ 206 GUEST_HANDLE(xen_pfn_t) gpfns; 207 208 /* OUT */ 209 210 /* Per index error code. */ 211 GUEST_HANDLE(int) errs; 212}; 213DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range); 214 215/* 216 * Returns the pseudo-physical memory map as it was when the domain 217 * was started (specified by XENMEM_set_memory_map). 218 * arg == addr of struct xen_memory_map. 219 */ 220#define XENMEM_memory_map 9 221struct xen_memory_map { 222 /* 223 * On call the number of entries which can be stored in buffer. On 224 * return the number of entries which have been stored in 225 * buffer. 226 */ 227 unsigned int nr_entries; 228 229 /* 230 * Entries in the buffer are in the same format as returned by the 231 * BIOS INT 0x15 EAX=0xE820 call. 232 */ 233 GUEST_HANDLE(void) buffer; 234}; 235DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map); 236 237/* 238 * Returns the real physical memory map. Passes the same structure as 239 * XENMEM_memory_map. 240 * arg == addr of struct xen_memory_map. 241 */ 242#define XENMEM_machine_memory_map 10 243 244 245/* 246 * Prevent the balloon driver from changing the memory reservation 247 * during a driver critical region. 248 */ 249extern spinlock_t xen_reservation_lock; 250 251/* 252 * Unmaps the page appearing at a particular GPFN from the specified guest's 253 * pseudophysical address space. 254 * arg == addr of xen_remove_from_physmap_t. 255 */ 256#define XENMEM_remove_from_physmap 15 257struct xen_remove_from_physmap { 258 /* Which domain to change the mapping for. */ 259 domid_t domid; 260 261 /* GPFN of the current mapping of the page. */ 262 xen_pfn_t gpfn; 263}; 264DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap); 265 266#endif /* __XEN_PUBLIC_MEMORY_H__ */ 267