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Commit | Line | Data |
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5ead97c8 JF |
1 | /* |
2 | * Machine specific setup for xen | |
3 | * | |
4 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/pm.h> | |
a9ce6bc1 | 11 | #include <linux/memblock.h> |
d91ee586 | 12 | #include <linux/cpuidle.h> |
48cdd828 | 13 | #include <linux/cpufreq.h> |
5ead97c8 JF |
14 | |
15 | #include <asm/elf.h> | |
6c3652ef | 16 | #include <asm/vdso.h> |
5ead97c8 JF |
17 | #include <asm/e820.h> |
18 | #include <asm/setup.h> | |
b792c755 | 19 | #include <asm/acpi.h> |
8d54db79 | 20 | #include <asm/numa.h> |
5ead97c8 JF |
21 | #include <asm/xen/hypervisor.h> |
22 | #include <asm/xen/hypercall.h> | |
23 | ||
45263cb0 | 24 | #include <xen/xen.h> |
8006ec3e | 25 | #include <xen/page.h> |
e2a81baf | 26 | #include <xen/interface/callback.h> |
35ae11fd | 27 | #include <xen/interface/memory.h> |
5ead97c8 JF |
28 | #include <xen/interface/physdev.h> |
29 | #include <xen/features.h> | |
5ead97c8 | 30 | #include "xen-ops.h" |
d2eea68e | 31 | #include "vdso.h" |
4fbb67e3 | 32 | #include "p2m.h" |
1f3ac86b | 33 | #include "mmu.h" |
5ead97c8 | 34 | |
42ee1471 | 35 | /* Amount of extra memory space we add to the e820 ranges */ |
8b5d44a5 | 36 | struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; |
42ee1471 | 37 | |
aa24411b DV |
38 | /* Number of pages released from the initial allocation. */ |
39 | unsigned long xen_released_pages; | |
40 | ||
1f3ac86b JG |
41 | /* |
42 | * Buffer used to remap identity mapped pages. We only need the virtual space. | |
43 | * The physical page behind this address is remapped as needed to different | |
44 | * buffer pages. | |
45 | */ | |
46 | #define REMAP_SIZE (P2M_PER_PAGE - 3) | |
47 | static struct { | |
48 | unsigned long next_area_mfn; | |
49 | unsigned long target_pfn; | |
50 | unsigned long size; | |
51 | unsigned long mfns[REMAP_SIZE]; | |
52 | } xen_remap_buf __initdata __aligned(PAGE_SIZE); | |
53 | static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY; | |
4fbb67e3 | 54 | |
698bb8d1 JF |
55 | /* |
56 | * The maximum amount of extra memory compared to the base size. The | |
57 | * main scaling factor is the size of struct page. At extreme ratios | |
58 | * of base:extra, all the base memory can be filled with page | |
59 | * structures for the extra memory, leaving no space for anything | |
60 | * else. | |
61 | * | |
62 | * 10x seems like a reasonable balance between scaling flexibility and | |
63 | * leaving a practically usable system. | |
64 | */ | |
65 | #define EXTRA_MEM_RATIO (10) | |
66 | ||
dc91c728 | 67 | static void __init xen_add_extra_mem(u64 start, u64 size) |
42ee1471 | 68 | { |
dc91c728 | 69 | int i; |
6eaa412f | 70 | |
dc91c728 DV |
71 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { |
72 | /* Add new region. */ | |
73 | if (xen_extra_mem[i].size == 0) { | |
74 | xen_extra_mem[i].start = start; | |
75 | xen_extra_mem[i].size = size; | |
76 | break; | |
77 | } | |
78 | /* Append to existing region. */ | |
79 | if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) { | |
80 | xen_extra_mem[i].size += size; | |
81 | break; | |
82 | } | |
83 | } | |
84 | if (i == XEN_EXTRA_MEM_MAX_REGIONS) | |
85 | printk(KERN_WARNING "Warning: not enough extra memory regions\n"); | |
42ee1471 | 86 | |
d4bbf7e7 | 87 | memblock_reserve(start, size); |
5b8e7d80 | 88 | } |
2f7acb20 | 89 | |
5b8e7d80 JG |
90 | static void __init xen_del_extra_mem(u64 start, u64 size) |
91 | { | |
92 | int i; | |
93 | u64 start_r, size_r; | |
c96aae1f | 94 | |
5b8e7d80 JG |
95 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { |
96 | start_r = xen_extra_mem[i].start; | |
97 | size_r = xen_extra_mem[i].size; | |
98 | ||
99 | /* Start of region. */ | |
100 | if (start_r == start) { | |
101 | BUG_ON(size > size_r); | |
102 | xen_extra_mem[i].start += size; | |
103 | xen_extra_mem[i].size -= size; | |
104 | break; | |
105 | } | |
106 | /* End of region. */ | |
107 | if (start_r + size_r == start + size) { | |
108 | BUG_ON(size > size_r); | |
109 | xen_extra_mem[i].size -= size; | |
110 | break; | |
111 | } | |
112 | /* Mid of region. */ | |
113 | if (start > start_r && start < start_r + size_r) { | |
114 | BUG_ON(start + size > start_r + size_r); | |
115 | xen_extra_mem[i].size = start - start_r; | |
116 | /* Calling memblock_reserve() again is okay. */ | |
117 | xen_add_extra_mem(start + size, start_r + size_r - | |
118 | (start + size)); | |
119 | break; | |
120 | } | |
121 | } | |
122 | memblock_free(start, size); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Called during boot before the p2m list can take entries beyond the | |
127 | * hypervisor supplied p2m list. Entries in extra mem are to be regarded as | |
128 | * invalid. | |
129 | */ | |
130 | unsigned long __ref xen_chk_extra_mem(unsigned long pfn) | |
131 | { | |
132 | int i; | |
e86f9496 | 133 | phys_addr_t addr = PFN_PHYS(pfn); |
6eaa412f | 134 | |
5b8e7d80 JG |
135 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { |
136 | if (addr >= xen_extra_mem[i].start && | |
137 | addr < xen_extra_mem[i].start + xen_extra_mem[i].size) | |
138 | return INVALID_P2M_ENTRY; | |
139 | } | |
140 | ||
141 | return IDENTITY_FRAME(pfn); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Mark all pfns of extra mem as invalid in p2m list. | |
146 | */ | |
147 | void __init xen_inv_extra_mem(void) | |
148 | { | |
149 | unsigned long pfn, pfn_s, pfn_e; | |
150 | int i; | |
151 | ||
152 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { | |
9a17ad7f JG |
153 | if (!xen_extra_mem[i].size) |
154 | continue; | |
5b8e7d80 JG |
155 | pfn_s = PFN_DOWN(xen_extra_mem[i].start); |
156 | pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size); | |
157 | for (pfn = pfn_s; pfn < pfn_e; pfn++) | |
158 | set_phys_to_machine(pfn, INVALID_P2M_ENTRY); | |
c96aae1f | 159 | } |
42ee1471 JF |
160 | } |
161 | ||
4fbb67e3 MR |
162 | /* |
163 | * Finds the next RAM pfn available in the E820 map after min_pfn. | |
164 | * This function updates min_pfn with the pfn found and returns | |
165 | * the size of that range or zero if not found. | |
166 | */ | |
167 | static unsigned long __init xen_find_pfn_range( | |
2e2fb754 | 168 | const struct e820entry *list, size_t map_size, |
4fbb67e3 | 169 | unsigned long *min_pfn) |
2e2fb754 KRW |
170 | { |
171 | const struct e820entry *entry; | |
172 | unsigned int i; | |
173 | unsigned long done = 0; | |
2e2fb754 KRW |
174 | |
175 | for (i = 0, entry = list; i < map_size; i++, entry++) { | |
2e2fb754 KRW |
176 | unsigned long s_pfn; |
177 | unsigned long e_pfn; | |
2e2fb754 KRW |
178 | |
179 | if (entry->type != E820_RAM) | |
180 | continue; | |
181 | ||
c3d93f88 | 182 | e_pfn = PFN_DOWN(entry->addr + entry->size); |
2e2fb754 | 183 | |
4fbb67e3 MR |
184 | /* We only care about E820 after this */ |
185 | if (e_pfn < *min_pfn) | |
2e2fb754 KRW |
186 | continue; |
187 | ||
c3d93f88 | 188 | s_pfn = PFN_UP(entry->addr); |
4fbb67e3 MR |
189 | |
190 | /* If min_pfn falls within the E820 entry, we want to start | |
191 | * at the min_pfn PFN. | |
2e2fb754 | 192 | */ |
4fbb67e3 MR |
193 | if (s_pfn <= *min_pfn) { |
194 | done = e_pfn - *min_pfn; | |
2e2fb754 | 195 | } else { |
4fbb67e3 MR |
196 | done = e_pfn - s_pfn; |
197 | *min_pfn = s_pfn; | |
2e2fb754 | 198 | } |
4fbb67e3 MR |
199 | break; |
200 | } | |
2e2fb754 | 201 | |
4fbb67e3 MR |
202 | return done; |
203 | } | |
2e2fb754 | 204 | |
1f3ac86b JG |
205 | static int __init xen_free_mfn(unsigned long mfn) |
206 | { | |
207 | struct xen_memory_reservation reservation = { | |
208 | .address_bits = 0, | |
209 | .extent_order = 0, | |
210 | .domid = DOMID_SELF | |
211 | }; | |
212 | ||
213 | set_xen_guest_handle(reservation.extent_start, &mfn); | |
214 | reservation.nr_extents = 1; | |
215 | ||
216 | return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation); | |
217 | } | |
218 | ||
4fbb67e3 | 219 | /* |
1f3ac86b | 220 | * This releases a chunk of memory and then does the identity map. It's used |
4fbb67e3 MR |
221 | * as a fallback if the remapping fails. |
222 | */ | |
223 | static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn, | |
bc7142cf | 224 | unsigned long end_pfn, unsigned long nr_pages, unsigned long *released) |
4fbb67e3 | 225 | { |
1f3ac86b JG |
226 | unsigned long pfn, end; |
227 | int ret; | |
228 | ||
4fbb67e3 MR |
229 | WARN_ON(start_pfn > end_pfn); |
230 | ||
bc7142cf | 231 | /* Release pages first. */ |
1f3ac86b JG |
232 | end = min(end_pfn, nr_pages); |
233 | for (pfn = start_pfn; pfn < end; pfn++) { | |
234 | unsigned long mfn = pfn_to_mfn(pfn); | |
235 | ||
236 | /* Make sure pfn exists to start with */ | |
237 | if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn) | |
238 | continue; | |
239 | ||
240 | ret = xen_free_mfn(mfn); | |
241 | WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret); | |
242 | ||
243 | if (ret == 1) { | |
bc7142cf | 244 | (*released)++; |
1f3ac86b JG |
245 | if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY)) |
246 | break; | |
1f3ac86b JG |
247 | } else |
248 | break; | |
249 | } | |
250 | ||
bc7142cf | 251 | set_phys_range_identity(start_pfn, end_pfn); |
4fbb67e3 MR |
252 | } |
253 | ||
254 | /* | |
1f3ac86b | 255 | * Helper function to update the p2m and m2p tables and kernel mapping. |
4fbb67e3 | 256 | */ |
1f3ac86b | 257 | static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn) |
4fbb67e3 MR |
258 | { |
259 | struct mmu_update update = { | |
260 | .ptr = ((unsigned long long)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE, | |
261 | .val = pfn | |
262 | }; | |
263 | ||
264 | /* Update p2m */ | |
1f3ac86b | 265 | if (!set_phys_to_machine(pfn, mfn)) { |
4fbb67e3 MR |
266 | WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n", |
267 | pfn, mfn); | |
1f3ac86b | 268 | BUG(); |
2e2fb754 | 269 | } |
4fbb67e3 MR |
270 | |
271 | /* Update m2p */ | |
272 | if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) { | |
273 | WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n", | |
274 | mfn, pfn); | |
1f3ac86b | 275 | BUG(); |
4fbb67e3 MR |
276 | } |
277 | ||
1f3ac86b | 278 | /* Update kernel mapping, but not for highmem. */ |
e86f9496 | 279 | if (pfn >= PFN_UP(__pa(high_memory - 1))) |
1f3ac86b JG |
280 | return; |
281 | ||
282 | if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT), | |
283 | mfn_pte(mfn, PAGE_KERNEL), 0)) { | |
284 | WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n", | |
285 | mfn, pfn); | |
286 | BUG(); | |
287 | } | |
2e2fb754 | 288 | } |
83d51ab4 | 289 | |
4fbb67e3 MR |
290 | /* |
291 | * This function updates the p2m and m2p tables with an identity map from | |
1f3ac86b JG |
292 | * start_pfn to start_pfn+size and prepares remapping the underlying RAM of the |
293 | * original allocation at remap_pfn. The information needed for remapping is | |
294 | * saved in the memory itself to avoid the need for allocating buffers. The | |
295 | * complete remap information is contained in a list of MFNs each containing | |
296 | * up to REMAP_SIZE MFNs and the start target PFN for doing the remap. | |
297 | * This enables us to preserve the original mfn sequence while doing the | |
298 | * remapping at a time when the memory management is capable of allocating | |
299 | * virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and | |
300 | * its callers. | |
4fbb67e3 | 301 | */ |
1f3ac86b | 302 | static void __init xen_do_set_identity_and_remap_chunk( |
4fbb67e3 | 303 | unsigned long start_pfn, unsigned long size, unsigned long remap_pfn) |
83d51ab4 | 304 | { |
1f3ac86b JG |
305 | unsigned long buf = (unsigned long)&xen_remap_buf; |
306 | unsigned long mfn_save, mfn; | |
4fbb67e3 | 307 | unsigned long ident_pfn_iter, remap_pfn_iter; |
1f3ac86b | 308 | unsigned long ident_end_pfn = start_pfn + size; |
4fbb67e3 | 309 | unsigned long left = size; |
1f3ac86b | 310 | unsigned int i, chunk; |
4fbb67e3 MR |
311 | |
312 | WARN_ON(size == 0); | |
313 | ||
314 | BUG_ON(xen_feature(XENFEAT_auto_translated_physmap)); | |
83d51ab4 | 315 | |
1f3ac86b | 316 | mfn_save = virt_to_mfn(buf); |
e201bfcc | 317 | |
1f3ac86b JG |
318 | for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn; |
319 | ident_pfn_iter < ident_end_pfn; | |
320 | ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) { | |
321 | chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE; | |
4fbb67e3 | 322 | |
1f3ac86b JG |
323 | /* Map first pfn to xen_remap_buf */ |
324 | mfn = pfn_to_mfn(ident_pfn_iter); | |
325 | set_pte_mfn(buf, mfn, PAGE_KERNEL); | |
4fbb67e3 | 326 | |
1f3ac86b JG |
327 | /* Save mapping information in page */ |
328 | xen_remap_buf.next_area_mfn = xen_remap_mfn; | |
329 | xen_remap_buf.target_pfn = remap_pfn_iter; | |
330 | xen_remap_buf.size = chunk; | |
331 | for (i = 0; i < chunk; i++) | |
332 | xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i); | |
4fbb67e3 | 333 | |
1f3ac86b JG |
334 | /* Put remap buf into list. */ |
335 | xen_remap_mfn = mfn; | |
4fbb67e3 | 336 | |
1f3ac86b | 337 | /* Set identity map */ |
bc7142cf | 338 | set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk); |
83d51ab4 | 339 | |
1f3ac86b | 340 | left -= chunk; |
4fbb67e3 | 341 | } |
83d51ab4 | 342 | |
1f3ac86b JG |
343 | /* Restore old xen_remap_buf mapping */ |
344 | set_pte_mfn(buf, mfn_save, PAGE_KERNEL); | |
83d51ab4 DV |
345 | } |
346 | ||
4fbb67e3 MR |
347 | /* |
348 | * This function takes a contiguous pfn range that needs to be identity mapped | |
349 | * and: | |
350 | * | |
351 | * 1) Finds a new range of pfns to use to remap based on E820 and remap_pfn. | |
352 | * 2) Calls the do_ function to actually do the mapping/remapping work. | |
353 | * | |
354 | * The goal is to not allocate additional memory but to remap the existing | |
355 | * pages. In the case of an error the underlying memory is simply released back | |
356 | * to Xen and not remapped. | |
357 | */ | |
76f0a486 | 358 | static unsigned long __init xen_set_identity_and_remap_chunk( |
4fbb67e3 MR |
359 | const struct e820entry *list, size_t map_size, unsigned long start_pfn, |
360 | unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn, | |
a97dae1a | 361 | unsigned long *released, unsigned long *remapped) |
4fbb67e3 MR |
362 | { |
363 | unsigned long pfn; | |
364 | unsigned long i = 0; | |
365 | unsigned long n = end_pfn - start_pfn; | |
366 | ||
367 | while (i < n) { | |
368 | unsigned long cur_pfn = start_pfn + i; | |
369 | unsigned long left = n - i; | |
370 | unsigned long size = left; | |
371 | unsigned long remap_range_size; | |
372 | ||
373 | /* Do not remap pages beyond the current allocation */ | |
374 | if (cur_pfn >= nr_pages) { | |
375 | /* Identity map remaining pages */ | |
bc7142cf | 376 | set_phys_range_identity(cur_pfn, cur_pfn + size); |
4fbb67e3 MR |
377 | break; |
378 | } | |
379 | if (cur_pfn + size > nr_pages) | |
380 | size = nr_pages - cur_pfn; | |
381 | ||
382 | remap_range_size = xen_find_pfn_range(list, map_size, | |
383 | &remap_pfn); | |
384 | if (!remap_range_size) { | |
385 | pr_warning("Unable to find available pfn range, not remapping identity pages\n"); | |
386 | xen_set_identity_and_release_chunk(cur_pfn, | |
bc7142cf | 387 | cur_pfn + left, nr_pages, released); |
4fbb67e3 MR |
388 | break; |
389 | } | |
390 | /* Adjust size to fit in current e820 RAM region */ | |
391 | if (size > remap_range_size) | |
392 | size = remap_range_size; | |
393 | ||
1f3ac86b | 394 | xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn); |
4fbb67e3 MR |
395 | |
396 | /* Update variables to reflect new mappings. */ | |
397 | i += size; | |
398 | remap_pfn += size; | |
a97dae1a | 399 | *remapped += size; |
4fbb67e3 MR |
400 | } |
401 | ||
402 | /* | |
403 | * If the PFNs are currently mapped, the VA mapping also needs | |
404 | * to be updated to be 1:1. | |
405 | */ | |
406 | for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++) | |
407 | (void)HYPERVISOR_update_va_mapping( | |
408 | (unsigned long)__va(pfn << PAGE_SHIFT), | |
409 | mfn_pte(pfn, PAGE_KERNEL_IO), 0); | |
410 | ||
411 | return remap_pfn; | |
412 | } | |
413 | ||
5b8e7d80 | 414 | static void __init xen_set_identity_and_remap( |
4fbb67e3 | 415 | const struct e820entry *list, size_t map_size, unsigned long nr_pages, |
a97dae1a | 416 | unsigned long *released, unsigned long *remapped) |
093d7b46 | 417 | { |
f3f436e3 | 418 | phys_addr_t start = 0; |
4fbb67e3 | 419 | unsigned long last_pfn = nr_pages; |
f3f436e3 | 420 | const struct e820entry *entry; |
4fbb67e3 | 421 | unsigned long num_released = 0; |
a97dae1a | 422 | unsigned long num_remapped = 0; |
68df0da7 KRW |
423 | int i; |
424 | ||
f3f436e3 DV |
425 | /* |
426 | * Combine non-RAM regions and gaps until a RAM region (or the | |
427 | * end of the map) is reached, then set the 1:1 map and | |
4fbb67e3 | 428 | * remap the memory in those non-RAM regions. |
f3f436e3 DV |
429 | * |
430 | * The combined non-RAM regions are rounded to a whole number | |
431 | * of pages so any partial pages are accessible via the 1:1 | |
432 | * mapping. This is needed for some BIOSes that put (for | |
433 | * example) the DMI tables in a reserved region that begins on | |
434 | * a non-page boundary. | |
435 | */ | |
68df0da7 | 436 | for (i = 0, entry = list; i < map_size; i++, entry++) { |
f3f436e3 | 437 | phys_addr_t end = entry->addr + entry->size; |
f3f436e3 DV |
438 | if (entry->type == E820_RAM || i == map_size - 1) { |
439 | unsigned long start_pfn = PFN_DOWN(start); | |
440 | unsigned long end_pfn = PFN_UP(end); | |
68df0da7 | 441 | |
f3f436e3 DV |
442 | if (entry->type == E820_RAM) |
443 | end_pfn = PFN_UP(entry->addr); | |
68df0da7 | 444 | |
83d51ab4 | 445 | if (start_pfn < end_pfn) |
4fbb67e3 MR |
446 | last_pfn = xen_set_identity_and_remap_chunk( |
447 | list, map_size, start_pfn, | |
448 | end_pfn, nr_pages, last_pfn, | |
a97dae1a | 449 | &num_released, &num_remapped); |
f3f436e3 | 450 | start = end; |
68df0da7 | 451 | } |
68df0da7 | 452 | } |
f3f436e3 | 453 | |
4fbb67e3 | 454 | *released = num_released; |
a97dae1a | 455 | *remapped = num_remapped; |
f3f436e3 | 456 | |
4fbb67e3 | 457 | pr_info("Released %ld page(s)\n", num_released); |
4fbb67e3 | 458 | } |
1f3ac86b JG |
459 | |
460 | /* | |
461 | * Remap the memory prepared in xen_do_set_identity_and_remap_chunk(). | |
462 | * The remap information (which mfn remap to which pfn) is contained in the | |
463 | * to be remapped memory itself in a linked list anchored at xen_remap_mfn. | |
464 | * This scheme allows to remap the different chunks in arbitrary order while | |
465 | * the resulting mapping will be independant from the order. | |
466 | */ | |
467 | void __init xen_remap_memory(void) | |
468 | { | |
469 | unsigned long buf = (unsigned long)&xen_remap_buf; | |
470 | unsigned long mfn_save, mfn, pfn; | |
471 | unsigned long remapped = 0; | |
472 | unsigned int i; | |
473 | unsigned long pfn_s = ~0UL; | |
474 | unsigned long len = 0; | |
475 | ||
476 | mfn_save = virt_to_mfn(buf); | |
477 | ||
478 | while (xen_remap_mfn != INVALID_P2M_ENTRY) { | |
479 | /* Map the remap information */ | |
480 | set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL); | |
481 | ||
482 | BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]); | |
483 | ||
484 | pfn = xen_remap_buf.target_pfn; | |
485 | for (i = 0; i < xen_remap_buf.size; i++) { | |
486 | mfn = xen_remap_buf.mfns[i]; | |
487 | xen_update_mem_tables(pfn, mfn); | |
488 | remapped++; | |
489 | pfn++; | |
490 | } | |
491 | if (pfn_s == ~0UL || pfn == pfn_s) { | |
492 | pfn_s = xen_remap_buf.target_pfn; | |
493 | len += xen_remap_buf.size; | |
494 | } else if (pfn_s + len == xen_remap_buf.target_pfn) { | |
495 | len += xen_remap_buf.size; | |
496 | } else { | |
5b8e7d80 | 497 | xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len)); |
1f3ac86b JG |
498 | pfn_s = xen_remap_buf.target_pfn; |
499 | len = xen_remap_buf.size; | |
500 | } | |
501 | ||
502 | mfn = xen_remap_mfn; | |
503 | xen_remap_mfn = xen_remap_buf.next_area_mfn; | |
504 | } | |
505 | ||
506 | if (pfn_s != ~0UL && len) | |
5b8e7d80 | 507 | xen_del_extra_mem(PFN_PHYS(pfn_s), PFN_PHYS(len)); |
1f3ac86b JG |
508 | |
509 | set_pte_mfn(buf, mfn_save, PAGE_KERNEL); | |
510 | ||
511 | pr_info("Remapped %ld page(s)\n", remapped); | |
512 | } | |
513 | ||
d312ae87 DV |
514 | static unsigned long __init xen_get_max_pages(void) |
515 | { | |
516 | unsigned long max_pages = MAX_DOMAIN_PAGES; | |
517 | domid_t domid = DOMID_SELF; | |
518 | int ret; | |
519 | ||
d3db7281 IC |
520 | /* |
521 | * For the initial domain we use the maximum reservation as | |
522 | * the maximum page. | |
523 | * | |
524 | * For guest domains the current maximum reservation reflects | |
525 | * the current maximum rather than the static maximum. In this | |
526 | * case the e820 map provided to us will cover the static | |
527 | * maximum region. | |
528 | */ | |
529 | if (xen_initial_domain()) { | |
530 | ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid); | |
531 | if (ret > 0) | |
532 | max_pages = ret; | |
533 | } | |
534 | ||
d312ae87 DV |
535 | return min(max_pages, MAX_DOMAIN_PAGES); |
536 | } | |
537 | ||
dc91c728 DV |
538 | static void xen_align_and_add_e820_region(u64 start, u64 size, int type) |
539 | { | |
540 | u64 end = start + size; | |
541 | ||
542 | /* Align RAM regions to page boundaries. */ | |
543 | if (type == E820_RAM) { | |
544 | start = PAGE_ALIGN(start); | |
545 | end &= ~((u64)PAGE_SIZE - 1); | |
546 | } | |
547 | ||
548 | e820_add_region(start, end - start, type); | |
549 | } | |
550 | ||
3bc38cbc DV |
551 | void xen_ignore_unusable(struct e820entry *list, size_t map_size) |
552 | { | |
553 | struct e820entry *entry; | |
554 | unsigned int i; | |
555 | ||
556 | for (i = 0, entry = list; i < map_size; i++, entry++) { | |
557 | if (entry->type == E820_UNUSABLE) | |
558 | entry->type = E820_RAM; | |
559 | } | |
560 | } | |
561 | ||
5ead97c8 JF |
562 | /** |
563 | * machine_specific_memory_setup - Hook for machine specific memory setup. | |
564 | **/ | |
5ead97c8 JF |
565 | char * __init xen_memory_setup(void) |
566 | { | |
35ae11fd IC |
567 | static struct e820entry map[E820MAX] __initdata; |
568 | ||
5ead97c8 | 569 | unsigned long max_pfn = xen_start_info->nr_pages; |
35ae11fd IC |
570 | unsigned long long mem_end; |
571 | int rc; | |
572 | struct xen_memory_map memmap; | |
dc91c728 | 573 | unsigned long max_pages; |
42ee1471 | 574 | unsigned long extra_pages = 0; |
a97dae1a | 575 | unsigned long remapped_pages; |
35ae11fd | 576 | int i; |
9e9a5fcb | 577 | int op; |
5ead97c8 | 578 | |
8006ec3e | 579 | max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); |
35ae11fd IC |
580 | mem_end = PFN_PHYS(max_pfn); |
581 | ||
582 | memmap.nr_entries = E820MAX; | |
583 | set_xen_guest_handle(memmap.buffer, map); | |
584 | ||
9e9a5fcb IC |
585 | op = xen_initial_domain() ? |
586 | XENMEM_machine_memory_map : | |
587 | XENMEM_memory_map; | |
588 | rc = HYPERVISOR_memory_op(op, &memmap); | |
35ae11fd | 589 | if (rc == -ENOSYS) { |
9ec23a7f | 590 | BUG_ON(xen_initial_domain()); |
35ae11fd IC |
591 | memmap.nr_entries = 1; |
592 | map[0].addr = 0ULL; | |
593 | map[0].size = mem_end; | |
594 | /* 8MB slack (to balance backend allocations). */ | |
595 | map[0].size += 8ULL << 20; | |
596 | map[0].type = E820_RAM; | |
597 | rc = 0; | |
598 | } | |
599 | BUG_ON(rc); | |
1ea644c8 | 600 | BUG_ON(memmap.nr_entries == 0); |
8006ec3e | 601 | |
3bc38cbc DV |
602 | /* |
603 | * Xen won't allow a 1:1 mapping to be created to UNUSABLE | |
604 | * regions, so if we're using the machine memory map leave the | |
605 | * region as RAM as it is in the pseudo-physical map. | |
606 | * | |
607 | * UNUSABLE regions in domUs are not handled and will need | |
608 | * a patch in the future. | |
609 | */ | |
610 | if (xen_initial_domain()) | |
611 | xen_ignore_unusable(map, memmap.nr_entries); | |
612 | ||
dc91c728 DV |
613 | /* Make sure the Xen-supplied memory map is well-ordered. */ |
614 | sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries); | |
615 | ||
616 | max_pages = xen_get_max_pages(); | |
617 | if (max_pages > max_pfn) | |
618 | extra_pages += max_pages - max_pfn; | |
619 | ||
f3f436e3 | 620 | /* |
1f3ac86b JG |
621 | * Set identity map on non-RAM pages and prepare remapping the |
622 | * underlying RAM. | |
f3f436e3 | 623 | */ |
5b8e7d80 | 624 | xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn, |
a97dae1a | 625 | &xen_released_pages, &remapped_pages); |
2e2fb754 | 626 | |
58b7b53a | 627 | extra_pages += xen_released_pages; |
a97dae1a | 628 | extra_pages += remapped_pages; |
2e2fb754 | 629 | |
dc91c728 DV |
630 | /* |
631 | * Clamp the amount of extra memory to a EXTRA_MEM_RATIO | |
632 | * factor the base size. On non-highmem systems, the base | |
633 | * size is the full initial memory allocation; on highmem it | |
634 | * is limited to the max size of lowmem, so that it doesn't | |
635 | * get completely filled. | |
636 | * | |
637 | * In principle there could be a problem in lowmem systems if | |
638 | * the initial memory is also very large with respect to | |
639 | * lowmem, but we won't try to deal with that here. | |
640 | */ | |
641 | extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)), | |
642 | extra_pages); | |
dc91c728 DV |
643 | i = 0; |
644 | while (i < memmap.nr_entries) { | |
645 | u64 addr = map[i].addr; | |
646 | u64 size = map[i].size; | |
647 | u32 type = map[i].type; | |
648 | ||
649 | if (type == E820_RAM) { | |
650 | if (addr < mem_end) { | |
651 | size = min(size, mem_end - addr); | |
652 | } else if (extra_pages) { | |
653 | size = min(size, (u64)extra_pages * PAGE_SIZE); | |
654 | extra_pages -= size / PAGE_SIZE; | |
655 | xen_add_extra_mem(addr, size); | |
5b8e7d80 | 656 | xen_max_p2m_pfn = PFN_DOWN(addr + size); |
dc91c728 DV |
657 | } else |
658 | type = E820_UNUSABLE; | |
3654581e JF |
659 | } |
660 | ||
dc91c728 | 661 | xen_align_and_add_e820_region(addr, size, type); |
b5b43ced | 662 | |
dc91c728 DV |
663 | map[i].addr += size; |
664 | map[i].size -= size; | |
665 | if (map[i].size == 0) | |
666 | i++; | |
35ae11fd | 667 | } |
b792c755 | 668 | |
25b884a8 DV |
669 | /* |
670 | * Set the rest as identity mapped, in case PCI BARs are | |
671 | * located here. | |
672 | * | |
673 | * PFNs above MAX_P2M_PFN are considered identity mapped as | |
674 | * well. | |
675 | */ | |
676 | set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul); | |
677 | ||
b792c755 | 678 | /* |
9ec23a7f IC |
679 | * In domU, the ISA region is normal, usable memory, but we |
680 | * reserve ISA memory anyway because too many things poke | |
b792c755 JF |
681 | * about in there. |
682 | */ | |
683 | e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, | |
684 | E820_RESERVED); | |
5ead97c8 | 685 | |
be5bf9fa JF |
686 | /* |
687 | * Reserve Xen bits: | |
688 | * - mfn_list | |
689 | * - xen_start_info | |
690 | * See comment above "struct start_info" in <xen/interface/xen.h> | |
51faaf2b KRW |
691 | * We tried to make the the memblock_reserve more selective so |
692 | * that it would be clear what region is reserved. Sadly we ran | |
693 | * in the problem wherein on a 64-bit hypervisor with a 32-bit | |
694 | * initial domain, the pt_base has the cr3 value which is not | |
695 | * neccessarily where the pagetable starts! As Jan put it: " | |
696 | * Actually, the adjustment turns out to be correct: The page | |
697 | * tables for a 32-on-64 dom0 get allocated in the order "first L1", | |
698 | * "first L2", "first L3", so the offset to the page table base is | |
699 | * indeed 2. When reading xen/include/public/xen.h's comment | |
700 | * very strictly, this is not a violation (since there nothing is said | |
701 | * that the first thing in the page table space is pointed to by | |
702 | * pt_base; I admit that this seems to be implied though, namely | |
703 | * do I think that it is implied that the page table space is the | |
704 | * range [pt_base, pt_base + nt_pt_frames), whereas that | |
705 | * range here indeed is [pt_base - 2, pt_base - 2 + nt_pt_frames), | |
706 | * which - without a priori knowledge - the kernel would have | |
707 | * difficulty to figure out)." - so lets just fall back to the | |
708 | * easy way and reserve the whole region. | |
be5bf9fa | 709 | */ |
24aa0788 TH |
710 | memblock_reserve(__pa(xen_start_info->mfn_list), |
711 | xen_start_info->pt_base - xen_start_info->mfn_list); | |
be5bf9fa JF |
712 | |
713 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
714 | ||
5ead97c8 JF |
715 | return "Xen"; |
716 | } | |
717 | ||
abacaadc DV |
718 | /* |
719 | * Machine specific memory setup for auto-translated guests. | |
720 | */ | |
721 | char * __init xen_auto_xlated_memory_setup(void) | |
722 | { | |
723 | static struct e820entry map[E820MAX] __initdata; | |
724 | ||
725 | struct xen_memory_map memmap; | |
726 | int i; | |
727 | int rc; | |
728 | ||
729 | memmap.nr_entries = E820MAX; | |
730 | set_xen_guest_handle(memmap.buffer, map); | |
731 | ||
732 | rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); | |
733 | if (rc < 0) | |
734 | panic("No memory map (%d)\n", rc); | |
735 | ||
736 | sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries); | |
737 | ||
738 | for (i = 0; i < memmap.nr_entries; i++) | |
739 | e820_add_region(map[i].addr, map[i].size, map[i].type); | |
740 | ||
741 | memblock_reserve(__pa(xen_start_info->mfn_list), | |
742 | xen_start_info->pt_base - xen_start_info->mfn_list); | |
743 | ||
744 | return "Xen"; | |
745 | } | |
746 | ||
d2eea68e RM |
747 | /* |
748 | * Set the bit indicating "nosegneg" library variants should be used. | |
6a52e4b1 JF |
749 | * We only need to bother in pure 32-bit mode; compat 32-bit processes |
750 | * can have un-truncated segments, so wrapping around is allowed. | |
d2eea68e | 751 | */ |
08b6d290 | 752 | static void __init fiddle_vdso(void) |
d2eea68e | 753 | { |
6a52e4b1 | 754 | #ifdef CONFIG_X86_32 |
6f121e54 AL |
755 | /* |
756 | * This could be called before selected_vdso32 is initialized, so | |
757 | * just fiddle with both possible images. vdso_image_32_syscall | |
758 | * can't be selected, since it only exists on 64-bit systems. | |
759 | */ | |
6a52e4b1 | 760 | u32 *mask; |
6f121e54 AL |
761 | mask = vdso_image_32_int80.data + |
762 | vdso_image_32_int80.sym_VDSO32_NOTE_MASK; | |
6a52e4b1 | 763 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
6f121e54 AL |
764 | mask = vdso_image_32_sysenter.data + |
765 | vdso_image_32_sysenter.sym_VDSO32_NOTE_MASK; | |
d2eea68e | 766 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
6fcac6d3 | 767 | #endif |
d2eea68e RM |
768 | } |
769 | ||
148f9bb8 | 770 | static int register_callback(unsigned type, const void *func) |
e2a81baf | 771 | { |
88459d4c JF |
772 | struct callback_register callback = { |
773 | .type = type, | |
774 | .address = XEN_CALLBACK(__KERNEL_CS, func), | |
e2a81baf JF |
775 | .flags = CALLBACKF_mask_events, |
776 | }; | |
777 | ||
88459d4c JF |
778 | return HYPERVISOR_callback_op(CALLBACKOP_register, &callback); |
779 | } | |
780 | ||
148f9bb8 | 781 | void xen_enable_sysenter(void) |
88459d4c | 782 | { |
6fcac6d3 | 783 | int ret; |
62541c37 | 784 | unsigned sysenter_feature; |
6fcac6d3 JF |
785 | |
786 | #ifdef CONFIG_X86_32 | |
62541c37 | 787 | sysenter_feature = X86_FEATURE_SEP; |
6fcac6d3 | 788 | #else |
62541c37 | 789 | sysenter_feature = X86_FEATURE_SYSENTER32; |
6fcac6d3 | 790 | #endif |
88459d4c | 791 | |
62541c37 JF |
792 | if (!boot_cpu_has(sysenter_feature)) |
793 | return; | |
794 | ||
6fcac6d3 | 795 | ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target); |
62541c37 JF |
796 | if(ret != 0) |
797 | setup_clear_cpu_cap(sysenter_feature); | |
e2a81baf JF |
798 | } |
799 | ||
148f9bb8 | 800 | void xen_enable_syscall(void) |
6fcac6d3 JF |
801 | { |
802 | #ifdef CONFIG_X86_64 | |
6fcac6d3 | 803 | int ret; |
6fcac6d3 JF |
804 | |
805 | ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target); | |
806 | if (ret != 0) { | |
d5303b81 | 807 | printk(KERN_ERR "Failed to set syscall callback: %d\n", ret); |
62541c37 JF |
808 | /* Pretty fatal; 64-bit userspace has no other |
809 | mechanism for syscalls. */ | |
810 | } | |
811 | ||
812 | if (boot_cpu_has(X86_FEATURE_SYSCALL32)) { | |
6fcac6d3 JF |
813 | ret = register_callback(CALLBACKTYPE_syscall32, |
814 | xen_syscall32_target); | |
d5303b81 | 815 | if (ret != 0) |
62541c37 | 816 | setup_clear_cpu_cap(X86_FEATURE_SYSCALL32); |
6fcac6d3 JF |
817 | } |
818 | #endif /* CONFIG_X86_64 */ | |
819 | } | |
ea9f9274 | 820 | |
d285d683 | 821 | void __init xen_pvmmu_arch_setup(void) |
5ead97c8 | 822 | { |
5ead97c8 JF |
823 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); |
824 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); | |
825 | ||
d285d683 MR |
826 | HYPERVISOR_vm_assist(VMASST_CMD_enable, |
827 | VMASST_TYPE_pae_extended_cr3); | |
5ead97c8 | 828 | |
88459d4c JF |
829 | if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) || |
830 | register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback)) | |
831 | BUG(); | |
5ead97c8 | 832 | |
e2a81baf | 833 | xen_enable_sysenter(); |
6fcac6d3 | 834 | xen_enable_syscall(); |
d285d683 MR |
835 | } |
836 | ||
837 | /* This function is not called for HVM domains */ | |
838 | void __init xen_arch_setup(void) | |
839 | { | |
840 | xen_panic_handler_init(); | |
841 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
842 | xen_pvmmu_arch_setup(); | |
843 | ||
5ead97c8 JF |
844 | #ifdef CONFIG_ACPI |
845 | if (!(xen_start_info->flags & SIF_INITDOMAIN)) { | |
846 | printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); | |
847 | disable_acpi(); | |
848 | } | |
849 | #endif | |
850 | ||
851 | memcpy(boot_command_line, xen_start_info->cmd_line, | |
852 | MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? | |
853 | COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); | |
854 | ||
bc15fde7 | 855 | /* Set up idle, making sure it calls safe_halt() pvop */ |
d91ee586 | 856 | disable_cpuidle(); |
48cdd828 | 857 | disable_cpufreq(); |
6a377ddc | 858 | WARN_ON(xen_set_default_idle()); |
d2eea68e | 859 | fiddle_vdso(); |
8d54db79 KRW |
860 | #ifdef CONFIG_NUMA |
861 | numa_off = 1; | |
862 | #endif | |
5ead97c8 | 863 | } |