Commit | Line | Data |
---|---|---|
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> |
5ead97c8 JF |
20 | #include <asm/xen/hypervisor.h> |
21 | #include <asm/xen/hypercall.h> | |
22 | ||
45263cb0 | 23 | #include <xen/xen.h> |
8006ec3e | 24 | #include <xen/page.h> |
e2a81baf | 25 | #include <xen/interface/callback.h> |
35ae11fd | 26 | #include <xen/interface/memory.h> |
5ead97c8 JF |
27 | #include <xen/interface/physdev.h> |
28 | #include <xen/features.h> | |
29 | ||
30 | #include "xen-ops.h" | |
d2eea68e | 31 | #include "vdso.h" |
5ead97c8 JF |
32 | |
33 | /* These are code, but not functions. Defined in entry.S */ | |
34 | extern const char xen_hypervisor_callback[]; | |
35 | extern const char xen_failsafe_callback[]; | |
f63c2f24 T |
36 | extern void xen_sysenter_target(void); |
37 | extern void xen_syscall_target(void); | |
38 | extern void xen_syscall32_target(void); | |
5ead97c8 | 39 | |
42ee1471 | 40 | /* Amount of extra memory space we add to the e820 ranges */ |
8b5d44a5 | 41 | struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; |
42ee1471 | 42 | |
aa24411b DV |
43 | /* Number of pages released from the initial allocation. */ |
44 | unsigned long xen_released_pages; | |
45 | ||
698bb8d1 JF |
46 | /* |
47 | * The maximum amount of extra memory compared to the base size. The | |
48 | * main scaling factor is the size of struct page. At extreme ratios | |
49 | * of base:extra, all the base memory can be filled with page | |
50 | * structures for the extra memory, leaving no space for anything | |
51 | * else. | |
52 | * | |
53 | * 10x seems like a reasonable balance between scaling flexibility and | |
54 | * leaving a practically usable system. | |
55 | */ | |
56 | #define EXTRA_MEM_RATIO (10) | |
57 | ||
dc91c728 | 58 | static void __init xen_add_extra_mem(u64 start, u64 size) |
42ee1471 | 59 | { |
6eaa412f | 60 | unsigned long pfn; |
dc91c728 | 61 | int i; |
6eaa412f | 62 | |
dc91c728 DV |
63 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { |
64 | /* Add new region. */ | |
65 | if (xen_extra_mem[i].size == 0) { | |
66 | xen_extra_mem[i].start = start; | |
67 | xen_extra_mem[i].size = size; | |
68 | break; | |
69 | } | |
70 | /* Append to existing region. */ | |
71 | if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) { | |
72 | xen_extra_mem[i].size += size; | |
73 | break; | |
74 | } | |
75 | } | |
76 | if (i == XEN_EXTRA_MEM_MAX_REGIONS) | |
77 | printk(KERN_WARNING "Warning: not enough extra memory regions\n"); | |
42ee1471 | 78 | |
d4bbf7e7 | 79 | memblock_reserve(start, size); |
2f7acb20 | 80 | |
dc91c728 | 81 | xen_max_p2m_pfn = PFN_DOWN(start + size); |
6eaa412f | 82 | |
dc91c728 | 83 | for (pfn = PFN_DOWN(start); pfn <= xen_max_p2m_pfn; pfn++) |
6eaa412f | 84 | __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); |
42ee1471 JF |
85 | } |
86 | ||
f3f436e3 DV |
87 | static unsigned long __init xen_release_chunk(unsigned long start, |
88 | unsigned long end) | |
093d7b46 MR |
89 | { |
90 | struct xen_memory_reservation reservation = { | |
91 | .address_bits = 0, | |
92 | .extent_order = 0, | |
93 | .domid = DOMID_SELF | |
94 | }; | |
f89e048e | 95 | unsigned long len = 0; |
093d7b46 MR |
96 | unsigned long pfn; |
97 | int ret; | |
98 | ||
f89e048e JF |
99 | for(pfn = start; pfn < end; pfn++) { |
100 | unsigned long mfn = pfn_to_mfn(pfn); | |
101 | ||
102 | /* Make sure pfn exists to start with */ | |
103 | if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn) | |
104 | continue; | |
105 | ||
106 | set_xen_guest_handle(reservation.extent_start, &mfn); | |
107 | reservation.nr_extents = 1; | |
108 | ||
109 | ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, | |
110 | &reservation); | |
98f531da | 111 | WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret); |
f89e048e | 112 | if (ret == 1) { |
6eaa412f | 113 | __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); |
f89e048e JF |
114 | len++; |
115 | } | |
116 | } | |
98f531da IM |
117 | printk(KERN_INFO "Freeing %lx-%lx pfn range: %lu pages freed\n", |
118 | start, end, len); | |
093d7b46 MR |
119 | |
120 | return len; | |
121 | } | |
122 | ||
f3f436e3 DV |
123 | static unsigned long __init xen_set_identity_and_release( |
124 | const struct e820entry *list, size_t map_size, unsigned long nr_pages) | |
093d7b46 | 125 | { |
f3f436e3 | 126 | phys_addr_t start = 0; |
093d7b46 | 127 | unsigned long released = 0; |
68df0da7 | 128 | unsigned long identity = 0; |
f3f436e3 | 129 | const struct e820entry *entry; |
68df0da7 KRW |
130 | int i; |
131 | ||
f3f436e3 DV |
132 | /* |
133 | * Combine non-RAM regions and gaps until a RAM region (or the | |
134 | * end of the map) is reached, then set the 1:1 map and | |
135 | * release the pages (if available) in those non-RAM regions. | |
136 | * | |
137 | * The combined non-RAM regions are rounded to a whole number | |
138 | * of pages so any partial pages are accessible via the 1:1 | |
139 | * mapping. This is needed for some BIOSes that put (for | |
140 | * example) the DMI tables in a reserved region that begins on | |
141 | * a non-page boundary. | |
142 | */ | |
68df0da7 | 143 | for (i = 0, entry = list; i < map_size; i++, entry++) { |
f3f436e3 | 144 | phys_addr_t end = entry->addr + entry->size; |
68df0da7 | 145 | |
f3f436e3 DV |
146 | if (entry->type == E820_RAM || i == map_size - 1) { |
147 | unsigned long start_pfn = PFN_DOWN(start); | |
148 | unsigned long end_pfn = PFN_UP(end); | |
68df0da7 | 149 | |
f3f436e3 DV |
150 | if (entry->type == E820_RAM) |
151 | end_pfn = PFN_UP(entry->addr); | |
68df0da7 | 152 | |
f3f436e3 DV |
153 | if (start_pfn < end_pfn) { |
154 | if (start_pfn < nr_pages) | |
155 | released += xen_release_chunk( | |
156 | start_pfn, min(end_pfn, nr_pages)); | |
68df0da7 | 157 | |
68df0da7 | 158 | identity += set_phys_range_identity( |
f3f436e3 DV |
159 | start_pfn, end_pfn); |
160 | } | |
161 | start = end; | |
68df0da7 | 162 | } |
68df0da7 | 163 | } |
f3f436e3 DV |
164 | |
165 | printk(KERN_INFO "Released %lu pages of unused memory\n", released); | |
166 | printk(KERN_INFO "Set %ld page(s) to 1-1 mapping\n", identity); | |
167 | ||
168 | return released; | |
68df0da7 | 169 | } |
d312ae87 DV |
170 | |
171 | static unsigned long __init xen_get_max_pages(void) | |
172 | { | |
173 | unsigned long max_pages = MAX_DOMAIN_PAGES; | |
174 | domid_t domid = DOMID_SELF; | |
175 | int ret; | |
176 | ||
d3db7281 IC |
177 | /* |
178 | * For the initial domain we use the maximum reservation as | |
179 | * the maximum page. | |
180 | * | |
181 | * For guest domains the current maximum reservation reflects | |
182 | * the current maximum rather than the static maximum. In this | |
183 | * case the e820 map provided to us will cover the static | |
184 | * maximum region. | |
185 | */ | |
186 | if (xen_initial_domain()) { | |
187 | ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid); | |
188 | if (ret > 0) | |
189 | max_pages = ret; | |
190 | } | |
191 | ||
d312ae87 DV |
192 | return min(max_pages, MAX_DOMAIN_PAGES); |
193 | } | |
194 | ||
dc91c728 DV |
195 | static void xen_align_and_add_e820_region(u64 start, u64 size, int type) |
196 | { | |
197 | u64 end = start + size; | |
198 | ||
199 | /* Align RAM regions to page boundaries. */ | |
200 | if (type == E820_RAM) { | |
201 | start = PAGE_ALIGN(start); | |
202 | end &= ~((u64)PAGE_SIZE - 1); | |
203 | } | |
204 | ||
205 | e820_add_region(start, end - start, type); | |
206 | } | |
207 | ||
5ead97c8 JF |
208 | /** |
209 | * machine_specific_memory_setup - Hook for machine specific memory setup. | |
210 | **/ | |
5ead97c8 JF |
211 | char * __init xen_memory_setup(void) |
212 | { | |
35ae11fd IC |
213 | static struct e820entry map[E820MAX] __initdata; |
214 | ||
5ead97c8 | 215 | unsigned long max_pfn = xen_start_info->nr_pages; |
35ae11fd IC |
216 | unsigned long long mem_end; |
217 | int rc; | |
218 | struct xen_memory_map memmap; | |
dc91c728 | 219 | unsigned long max_pages; |
42ee1471 | 220 | unsigned long extra_pages = 0; |
35ae11fd | 221 | int i; |
9e9a5fcb | 222 | int op; |
5ead97c8 | 223 | |
8006ec3e | 224 | max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); |
35ae11fd IC |
225 | mem_end = PFN_PHYS(max_pfn); |
226 | ||
227 | memmap.nr_entries = E820MAX; | |
228 | set_xen_guest_handle(memmap.buffer, map); | |
229 | ||
9e9a5fcb IC |
230 | op = xen_initial_domain() ? |
231 | XENMEM_machine_memory_map : | |
232 | XENMEM_memory_map; | |
233 | rc = HYPERVISOR_memory_op(op, &memmap); | |
35ae11fd | 234 | if (rc == -ENOSYS) { |
9ec23a7f | 235 | BUG_ON(xen_initial_domain()); |
35ae11fd IC |
236 | memmap.nr_entries = 1; |
237 | map[0].addr = 0ULL; | |
238 | map[0].size = mem_end; | |
239 | /* 8MB slack (to balance backend allocations). */ | |
240 | map[0].size += 8ULL << 20; | |
241 | map[0].type = E820_RAM; | |
242 | rc = 0; | |
243 | } | |
244 | BUG_ON(rc); | |
8006ec3e | 245 | |
dc91c728 DV |
246 | /* Make sure the Xen-supplied memory map is well-ordered. */ |
247 | sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries); | |
248 | ||
249 | max_pages = xen_get_max_pages(); | |
250 | if (max_pages > max_pfn) | |
251 | extra_pages += max_pages - max_pfn; | |
252 | ||
f3f436e3 DV |
253 | /* |
254 | * Set P2M for all non-RAM pages and E820 gaps to be identity | |
255 | * type PFNs. Any RAM pages that would be made inaccesible by | |
256 | * this are first released. | |
257 | */ | |
258 | xen_released_pages = xen_set_identity_and_release( | |
259 | map, memmap.nr_entries, max_pfn); | |
dc91c728 DV |
260 | extra_pages += xen_released_pages; |
261 | ||
262 | /* | |
263 | * Clamp the amount of extra memory to a EXTRA_MEM_RATIO | |
264 | * factor the base size. On non-highmem systems, the base | |
265 | * size is the full initial memory allocation; on highmem it | |
266 | * is limited to the max size of lowmem, so that it doesn't | |
267 | * get completely filled. | |
268 | * | |
269 | * In principle there could be a problem in lowmem systems if | |
270 | * the initial memory is also very large with respect to | |
271 | * lowmem, but we won't try to deal with that here. | |
272 | */ | |
273 | extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)), | |
274 | extra_pages); | |
275 | ||
276 | i = 0; | |
277 | while (i < memmap.nr_entries) { | |
278 | u64 addr = map[i].addr; | |
279 | u64 size = map[i].size; | |
280 | u32 type = map[i].type; | |
281 | ||
282 | if (type == E820_RAM) { | |
283 | if (addr < mem_end) { | |
284 | size = min(size, mem_end - addr); | |
285 | } else if (extra_pages) { | |
286 | size = min(size, (u64)extra_pages * PAGE_SIZE); | |
287 | extra_pages -= size / PAGE_SIZE; | |
288 | xen_add_extra_mem(addr, size); | |
289 | } else | |
290 | type = E820_UNUSABLE; | |
3654581e JF |
291 | } |
292 | ||
dc91c728 | 293 | xen_align_and_add_e820_region(addr, size, type); |
b5b43ced | 294 | |
dc91c728 DV |
295 | map[i].addr += size; |
296 | map[i].size -= size; | |
297 | if (map[i].size == 0) | |
298 | i++; | |
35ae11fd | 299 | } |
b792c755 JF |
300 | |
301 | /* | |
9ec23a7f IC |
302 | * In domU, the ISA region is normal, usable memory, but we |
303 | * reserve ISA memory anyway because too many things poke | |
b792c755 JF |
304 | * about in there. |
305 | */ | |
306 | e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, | |
307 | E820_RESERVED); | |
5ead97c8 | 308 | |
be5bf9fa JF |
309 | /* |
310 | * Reserve Xen bits: | |
311 | * - mfn_list | |
312 | * - xen_start_info | |
313 | * See comment above "struct start_info" in <xen/interface/xen.h> | |
314 | */ | |
24aa0788 TH |
315 | memblock_reserve(__pa(xen_start_info->mfn_list), |
316 | xen_start_info->pt_base - xen_start_info->mfn_list); | |
be5bf9fa JF |
317 | |
318 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
319 | ||
5ead97c8 JF |
320 | return "Xen"; |
321 | } | |
322 | ||
d2eea68e RM |
323 | /* |
324 | * Set the bit indicating "nosegneg" library variants should be used. | |
6a52e4b1 JF |
325 | * We only need to bother in pure 32-bit mode; compat 32-bit processes |
326 | * can have un-truncated segments, so wrapping around is allowed. | |
d2eea68e | 327 | */ |
08b6d290 | 328 | static void __init fiddle_vdso(void) |
d2eea68e | 329 | { |
6a52e4b1 JF |
330 | #ifdef CONFIG_X86_32 |
331 | u32 *mask; | |
332 | mask = VDSO32_SYMBOL(&vdso32_int80_start, NOTE_MASK); | |
333 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; | |
334 | mask = VDSO32_SYMBOL(&vdso32_sysenter_start, NOTE_MASK); | |
d2eea68e | 335 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
6fcac6d3 | 336 | #endif |
d2eea68e RM |
337 | } |
338 | ||
ae15a3b4 | 339 | static int __cpuinit register_callback(unsigned type, const void *func) |
e2a81baf | 340 | { |
88459d4c JF |
341 | struct callback_register callback = { |
342 | .type = type, | |
343 | .address = XEN_CALLBACK(__KERNEL_CS, func), | |
e2a81baf JF |
344 | .flags = CALLBACKF_mask_events, |
345 | }; | |
346 | ||
88459d4c JF |
347 | return HYPERVISOR_callback_op(CALLBACKOP_register, &callback); |
348 | } | |
349 | ||
350 | void __cpuinit xen_enable_sysenter(void) | |
351 | { | |
6fcac6d3 | 352 | int ret; |
62541c37 | 353 | unsigned sysenter_feature; |
6fcac6d3 JF |
354 | |
355 | #ifdef CONFIG_X86_32 | |
62541c37 | 356 | sysenter_feature = X86_FEATURE_SEP; |
6fcac6d3 | 357 | #else |
62541c37 | 358 | sysenter_feature = X86_FEATURE_SYSENTER32; |
6fcac6d3 | 359 | #endif |
88459d4c | 360 | |
62541c37 JF |
361 | if (!boot_cpu_has(sysenter_feature)) |
362 | return; | |
363 | ||
6fcac6d3 | 364 | ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target); |
62541c37 JF |
365 | if(ret != 0) |
366 | setup_clear_cpu_cap(sysenter_feature); | |
e2a81baf JF |
367 | } |
368 | ||
6fcac6d3 JF |
369 | void __cpuinit xen_enable_syscall(void) |
370 | { | |
371 | #ifdef CONFIG_X86_64 | |
6fcac6d3 | 372 | int ret; |
6fcac6d3 JF |
373 | |
374 | ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target); | |
375 | if (ret != 0) { | |
d5303b81 | 376 | printk(KERN_ERR "Failed to set syscall callback: %d\n", ret); |
62541c37 JF |
377 | /* Pretty fatal; 64-bit userspace has no other |
378 | mechanism for syscalls. */ | |
379 | } | |
380 | ||
381 | if (boot_cpu_has(X86_FEATURE_SYSCALL32)) { | |
6fcac6d3 JF |
382 | ret = register_callback(CALLBACKTYPE_syscall32, |
383 | xen_syscall32_target); | |
d5303b81 | 384 | if (ret != 0) |
62541c37 | 385 | setup_clear_cpu_cap(X86_FEATURE_SYSCALL32); |
6fcac6d3 JF |
386 | } |
387 | #endif /* CONFIG_X86_64 */ | |
388 | } | |
389 | ||
5ead97c8 JF |
390 | void __init xen_arch_setup(void) |
391 | { | |
f09f6d19 DD |
392 | xen_panic_handler_init(); |
393 | ||
5ead97c8 JF |
394 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); |
395 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); | |
396 | ||
397 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
f63c2f24 T |
398 | HYPERVISOR_vm_assist(VMASST_CMD_enable, |
399 | VMASST_TYPE_pae_extended_cr3); | |
5ead97c8 | 400 | |
88459d4c JF |
401 | if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) || |
402 | register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback)) | |
403 | BUG(); | |
5ead97c8 | 404 | |
e2a81baf | 405 | xen_enable_sysenter(); |
6fcac6d3 | 406 | xen_enable_syscall(); |
e2a81baf | 407 | |
5ead97c8 JF |
408 | #ifdef CONFIG_ACPI |
409 | if (!(xen_start_info->flags & SIF_INITDOMAIN)) { | |
410 | printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); | |
411 | disable_acpi(); | |
412 | } | |
413 | #endif | |
414 | ||
415 | memcpy(boot_command_line, xen_start_info->cmd_line, | |
416 | MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? | |
417 | COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); | |
418 | ||
bc15fde7 JF |
419 | /* Set up idle, making sure it calls safe_halt() pvop */ |
420 | #ifdef CONFIG_X86_32 | |
421 | boot_cpu_data.hlt_works_ok = 1; | |
422 | #endif | |
d91ee586 | 423 | disable_cpuidle(); |
48cdd828 | 424 | disable_cpufreq(); |
e5fd47bf | 425 | WARN_ON(set_pm_idle_to_default()); |
d2eea68e | 426 | fiddle_vdso(); |
5ead97c8 | 427 | } |