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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#define XENMAPSPACE_dev_mmio 5 /* device mmio region */
164
165/*
166 * Sets the GPFN at which a particular page appears in the specified guest's
167 * pseudophysical address space.
168 * arg == addr of xen_add_to_physmap_t.
169 */
170#define XENMEM_add_to_physmap 7
171struct xen_add_to_physmap {
172 /* Which domain to change the mapping for. */
173 domid_t domid;
174
175 /* Number of pages to go through for gmfn_range */
176 uint16_t size;
177
178 /* Source mapping space. */
179 unsigned int space;
180
181 /* Index into source mapping space. */
182 xen_ulong_t idx;
183
184 /* GPFN where the source mapping page should appear. */
185 xen_pfn_t gpfn;
186};
187DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
188
189/*** REMOVED ***/
190/*#define XENMEM_translate_gpfn_list 8*/
191
192#define XENMEM_add_to_physmap_range 23
193struct xen_add_to_physmap_range {
194 /* IN */
195 /* Which domain to change the mapping for. */
196 domid_t domid;
197 uint16_t space; /* => enum phys_map_space */
198
199 /* Number of pages to go through */
200 uint16_t size;
201 domid_t foreign_domid; /* IFF gmfn_foreign */
202
203 /* Indexes into space being mapped. */
204 GUEST_HANDLE(xen_ulong_t) idxs;
205
206 /* GPFN in domid where the source mapping page should appear. */
207 GUEST_HANDLE(xen_pfn_t) gpfns;
208
209 /* OUT */
210
211 /* Per index error code. */
212 GUEST_HANDLE(int) errs;
213};
214DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);
215
216/*
217 * Returns the pseudo-physical memory map as it was when the domain
218 * was started (specified by XENMEM_set_memory_map).
219 * arg == addr of struct xen_memory_map.
220 */
221#define XENMEM_memory_map 9
222struct xen_memory_map {
223 /*
224 * On call the number of entries which can be stored in buffer. On
225 * return the number of entries which have been stored in
226 * buffer.
227 */
228 unsigned int nr_entries;
229
230 /*
231 * Entries in the buffer are in the same format as returned by the
232 * BIOS INT 0x15 EAX=0xE820 call.
233 */
234 GUEST_HANDLE(void) buffer;
235};
236DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
237
238/*
239 * Returns the real physical memory map. Passes the same structure as
240 * XENMEM_memory_map.
241 * arg == addr of struct xen_memory_map.
242 */
243#define XENMEM_machine_memory_map 10
244
245
246/*
247 * Prevent the balloon driver from changing the memory reservation
248 * during a driver critical region.
249 */
250extern spinlock_t xen_reservation_lock;
251
252/*
253 * Unmaps the page appearing at a particular GPFN from the specified guest's
254 * pseudophysical address space.
255 * arg == addr of xen_remove_from_physmap_t.
256 */
257#define XENMEM_remove_from_physmap 15
258struct xen_remove_from_physmap {
259 /* Which domain to change the mapping for. */
260 domid_t domid;
261
262 /* GPFN of the current mapping of the page. */
263 xen_pfn_t gpfn;
264};
265DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
266
267#endif /* __XEN_PUBLIC_MEMORY_H__ */