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 GUEST_HANDLE(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 DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation); 54 55 /* 56 * Returns the maximum machine frame number of mapped RAM in this system. 57 * This command always succeeds (it never returns an error code). 58 * arg == NULL. 59 */ 60 #define XENMEM_maximum_ram_page 2 61 62 /* 63 * Returns the current or maximum memory reservation, in pages, of the 64 * specified domain (may be DOMID_SELF). Returns -ve errcode on failure. 65 * arg == addr of domid_t. 66 */ 67 #define XENMEM_current_reservation 3 68 #define XENMEM_maximum_reservation 4 69 70 /* 71 * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys 72 * mapping table. Architectures which do not have a m2p table do not implement 73 * this command. 74 * arg == addr of xen_machphys_mfn_list_t. 75 */ 76 #define XENMEM_machphys_mfn_list 5 77 struct xen_machphys_mfn_list { 78 /* 79 * Size of the 'extent_start' array. Fewer entries will be filled if the 80 * machphys table is smaller than max_extents * 2MB. 81 */ 82 unsigned int max_extents; 83 84 /* 85 * Pointer to buffer to fill with list of extent starts. If there are 86 * any large discontiguities in the machine address space, 2MB gaps in 87 * the machphys table will be represented by an MFN base of zero. 88 */ 89 GUEST_HANDLE(ulong) extent_start; 90 91 /* 92 * Number of extents written to the above array. This will be smaller 93 * than 'max_extents' if the machphys table is smaller than max_e * 2MB. 94 */ 95 unsigned int nr_extents; 96 }; 97 DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list); 98 99 /* 100 * Sets the GPFN at which a particular page appears in the specified guest's 101 * pseudophysical address space. 102 * arg == addr of xen_add_to_physmap_t. 103 */ 104 #define XENMEM_add_to_physmap 7 105 struct xen_add_to_physmap { 106 /* Which domain to change the mapping for. */ 107 domid_t domid; 108 109 /* Source mapping space. */ 110 #define XENMAPSPACE_shared_info 0 /* shared info page */ 111 #define XENMAPSPACE_grant_table 1 /* grant table page */ 112 unsigned int space; 113 114 /* Index into source mapping space. */ 115 unsigned long idx; 116 117 /* GPFN where the source mapping page should appear. */ 118 unsigned long gpfn; 119 }; 120 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap); 121 122 /* 123 * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error 124 * code on failure. This call only works for auto-translated guests. 125 */ 126 #define XENMEM_translate_gpfn_list 8 127 struct xen_translate_gpfn_list { 128 /* Which domain to translate for? */ 129 domid_t domid; 130 131 /* Length of list. */ 132 unsigned long nr_gpfns; 133 134 /* List of GPFNs to translate. */ 135 GUEST_HANDLE(ulong) gpfn_list; 136 137 /* 138 * Output list to contain MFN translations. May be the same as the input 139 * list (in which case each input GPFN is overwritten with the output MFN). 140 */ 141 GUEST_HANDLE(ulong) mfn_list; 142 }; 143 DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list); 144 145 #endif /* __XEN_PUBLIC_MEMORY_H__ */ 146