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 /* 13 * Increase or decrease the specified domain's memory reservation. Returns a 14 * -ve errcode on failure, or the # extents successfully allocated or freed. 15 * arg == addr of struct xen_memory_reservation. 16 */ 17 #define XENMEM_increase_reservation 0 18 #define XENMEM_decrease_reservation 1 19 #define XENMEM_populate_physmap 6 20 struct xen_memory_reservation { 21 22 /* 23 * XENMEM_increase_reservation: 24 * OUT: MFN (*not* GMFN) bases of extents that were allocated 25 * XENMEM_decrease_reservation: 26 * IN: GMFN bases of extents to free 27 * XENMEM_populate_physmap: 28 * IN: GPFN bases of extents to populate with memory 29 * OUT: GMFN bases of extents that were allocated 30 * (NB. This command also updates the mach_to_phys translation table) 31 */ 32 ulong extent_start; 33 34 /* Number of extents, and size/alignment of each (2^extent_order pages). */ 35 unsigned long nr_extents; 36 unsigned int extent_order; 37 38 /* 39 * Maximum # bits addressable by the user of the allocated region (e.g., 40 * I/O devices often have a 32-bit limitation even in 64-bit systems). If 41 * zero then the user has no addressing restriction. 42 * This field is not used by XENMEM_decrease_reservation. 43 */ 44 unsigned int address_bits; 45 46 /* 47 * Domain whose reservation is being changed. 48 * Unprivileged domains can specify only DOMID_SELF. 49 */ 50 domid_t domid; 51 52 }; 53 54 /* 55 * Returns the maximum machine frame number of mapped RAM in this system. 56 * This command always succeeds (it never returns an error code). 57 * arg == NULL. 58 */ 59 #define XENMEM_maximum_ram_page 2 60 61 /* 62 * Returns the current or maximum memory reservation, in pages, of the 63 * specified domain (may be DOMID_SELF). Returns -ve errcode on failure. 64 * arg == addr of domid_t. 65 */ 66 #define XENMEM_current_reservation 3 67 #define XENMEM_maximum_reservation 4 68 69 /* 70 * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys 71 * mapping table. Architectures which do not have a m2p table do not implement 72 * this command. 73 * arg == addr of xen_machphys_mfn_list_t. 74 */ 75 #define XENMEM_machphys_mfn_list 5 76 struct xen_machphys_mfn_list { 77 /* 78 * Size of the 'extent_start' array. Fewer entries will be filled if the 79 * machphys table is smaller than max_extents * 2MB. 80 */ 81 unsigned int max_extents; 82 83 /* 84 * Pointer to buffer to fill with list of extent starts. If there are 85 * any large discontiguities in the machine address space, 2MB gaps in 86 * the machphys table will be represented by an MFN base of zero. 87 */ 88 ulong extent_start; 89 90 /* 91 * Number of extents written to the above array. This will be smaller 92 * than 'max_extents' if the machphys table is smaller than max_e * 2MB. 93 */ 94 unsigned int nr_extents; 95 }; 96 97 /* 98 * Sets the GPFN at which a particular page appears in the specified guest's 99 * pseudophysical address space. 100 * arg == addr of xen_add_to_physmap_t. 101 */ 102 #define XENMEM_add_to_physmap 7 103 struct xen_add_to_physmap { 104 /* Which domain to change the mapping for. */ 105 domid_t domid; 106 107 /* Source mapping space. */ 108 #define XENMAPSPACE_shared_info 0 /* shared info page */ 109 #define XENMAPSPACE_grant_table 1 /* grant table page */ 110 unsigned int space; 111 112 /* Index into source mapping space. */ 113 unsigned long idx; 114 115 /* GPFN where the source mapping page should appear. */ 116 unsigned long gpfn; 117 }; 118 119 /* 120 * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error 121 * code on failure. This call only works for auto-translated guests. 122 */ 123 #define XENMEM_translate_gpfn_list 8 124 struct xen_translate_gpfn_list { 125 /* Which domain to translate for? */ 126 domid_t domid; 127 128 /* Length of list. */ 129 unsigned long nr_gpfns; 130 131 /* List of GPFNs to translate. */ 132 ulong gpfn_list; 133 134 /* 135 * Output list to contain MFN translations. May be the same as the input 136 * list (in which case each input GPFN is overwritten with the output MFN). 137 */ 138 ulong mfn_list; 139 }; 140 141 #endif /* __XEN_PUBLIC_MEMORY_H__ */ 142