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(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}; 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 unsigned long 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(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}; 141DEFINE_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 149struct 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}; 164DEFINE_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 171struct 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}; 187DEFINE_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 */ 194extern spinlock_t xen_reservation_lock; 195#endif /* __XEN_PUBLIC_MEMORY_H__ */ 196