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> |
5ead97c8 JF |
13 | |
14 | #include <asm/elf.h> | |
6c3652ef | 15 | #include <asm/vdso.h> |
5ead97c8 JF |
16 | #include <asm/e820.h> |
17 | #include <asm/setup.h> | |
b792c755 | 18 | #include <asm/acpi.h> |
5ead97c8 JF |
19 | #include <asm/xen/hypervisor.h> |
20 | #include <asm/xen/hypercall.h> | |
21 | ||
45263cb0 | 22 | #include <xen/xen.h> |
8006ec3e | 23 | #include <xen/page.h> |
e2a81baf | 24 | #include <xen/interface/callback.h> |
35ae11fd | 25 | #include <xen/interface/memory.h> |
5ead97c8 JF |
26 | #include <xen/interface/physdev.h> |
27 | #include <xen/features.h> | |
28 | ||
29 | #include "xen-ops.h" | |
d2eea68e | 30 | #include "vdso.h" |
5ead97c8 JF |
31 | |
32 | /* These are code, but not functions. Defined in entry.S */ | |
33 | extern const char xen_hypervisor_callback[]; | |
34 | extern const char xen_failsafe_callback[]; | |
f63c2f24 T |
35 | extern void xen_sysenter_target(void); |
36 | extern void xen_syscall_target(void); | |
37 | extern void xen_syscall32_target(void); | |
5ead97c8 | 38 | |
42ee1471 | 39 | /* Amount of extra memory space we add to the e820 ranges */ |
8b5d44a5 | 40 | struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; |
42ee1471 | 41 | |
aa24411b DV |
42 | /* Number of pages released from the initial allocation. */ |
43 | unsigned long xen_released_pages; | |
44 | ||
698bb8d1 JF |
45 | /* |
46 | * The maximum amount of extra memory compared to the base size. The | |
47 | * main scaling factor is the size of struct page. At extreme ratios | |
48 | * of base:extra, all the base memory can be filled with page | |
49 | * structures for the extra memory, leaving no space for anything | |
50 | * else. | |
51 | * | |
52 | * 10x seems like a reasonable balance between scaling flexibility and | |
53 | * leaving a practically usable system. | |
54 | */ | |
55 | #define EXTRA_MEM_RATIO (10) | |
56 | ||
dc91c728 | 57 | static void __init xen_add_extra_mem(u64 start, u64 size) |
42ee1471 | 58 | { |
6eaa412f | 59 | unsigned long pfn; |
dc91c728 | 60 | int i; |
6eaa412f | 61 | |
dc91c728 DV |
62 | for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) { |
63 | /* Add new region. */ | |
64 | if (xen_extra_mem[i].size == 0) { | |
65 | xen_extra_mem[i].start = start; | |
66 | xen_extra_mem[i].size = size; | |
67 | break; | |
68 | } | |
69 | /* Append to existing region. */ | |
70 | if (xen_extra_mem[i].start + xen_extra_mem[i].size == start) { | |
71 | xen_extra_mem[i].size += size; | |
72 | break; | |
73 | } | |
74 | } | |
75 | if (i == XEN_EXTRA_MEM_MAX_REGIONS) | |
76 | printk(KERN_WARNING "Warning: not enough extra memory regions\n"); | |
42ee1471 | 77 | |
dc91c728 | 78 | memblock_x86_reserve_range(start, start + size, "XEN EXTRA"); |
2f7acb20 | 79 | |
dc91c728 | 80 | xen_max_p2m_pfn = PFN_DOWN(start + size); |
6eaa412f | 81 | |
dc91c728 | 82 | for (pfn = PFN_DOWN(start); pfn <= xen_max_p2m_pfn; pfn++) |
6eaa412f | 83 | __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); |
42ee1471 JF |
84 | } |
85 | ||
f89e048e JF |
86 | static unsigned long __init xen_release_chunk(phys_addr_t start_addr, |
87 | phys_addr_t end_addr) | |
093d7b46 MR |
88 | { |
89 | struct xen_memory_reservation reservation = { | |
90 | .address_bits = 0, | |
91 | .extent_order = 0, | |
92 | .domid = DOMID_SELF | |
93 | }; | |
093d7b46 | 94 | unsigned long start, end; |
f89e048e | 95 | unsigned long len = 0; |
093d7b46 MR |
96 | unsigned long pfn; |
97 | int ret; | |
98 | ||
99 | start = PFN_UP(start_addr); | |
f89e048e | 100 | end = PFN_DOWN(end_addr); |
093d7b46 MR |
101 | |
102 | if (end <= start) | |
103 | return 0; | |
104 | ||
f89e048e JF |
105 | for(pfn = start; pfn < end; pfn++) { |
106 | unsigned long mfn = pfn_to_mfn(pfn); | |
107 | ||
108 | /* Make sure pfn exists to start with */ | |
109 | if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn) | |
110 | continue; | |
111 | ||
112 | set_xen_guest_handle(reservation.extent_start, &mfn); | |
113 | reservation.nr_extents = 1; | |
114 | ||
115 | ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, | |
116 | &reservation); | |
98f531da | 117 | WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret); |
f89e048e | 118 | if (ret == 1) { |
6eaa412f | 119 | __set_phys_to_machine(pfn, INVALID_P2M_ENTRY); |
f89e048e JF |
120 | len++; |
121 | } | |
122 | } | |
98f531da IM |
123 | printk(KERN_INFO "Freeing %lx-%lx pfn range: %lu pages freed\n", |
124 | start, end, len); | |
093d7b46 MR |
125 | |
126 | return len; | |
127 | } | |
128 | ||
dc91c728 DV |
129 | static unsigned long __init xen_return_unused_memory( |
130 | unsigned long max_pfn, const struct e820entry *map, int nr_map) | |
093d7b46 | 131 | { |
f89e048e | 132 | phys_addr_t max_addr = PFN_PHYS(max_pfn); |
9ec23a7f | 133 | phys_addr_t last_end = ISA_END_ADDRESS; |
093d7b46 MR |
134 | unsigned long released = 0; |
135 | int i; | |
136 | ||
9ec23a7f | 137 | /* Free any unused memory above the low 1Mbyte. */ |
dc91c728 DV |
138 | for (i = 0; i < nr_map && last_end < max_addr; i++) { |
139 | phys_addr_t end = map[i].addr; | |
f89e048e JF |
140 | end = min(max_addr, end); |
141 | ||
9ec23a7f IC |
142 | if (last_end < end) |
143 | released += xen_release_chunk(last_end, end); | |
dc91c728 | 144 | last_end = max(last_end, map[i].addr + map[i].size); |
093d7b46 MR |
145 | } |
146 | ||
f89e048e JF |
147 | if (last_end < max_addr) |
148 | released += xen_release_chunk(last_end, max_addr); | |
093d7b46 | 149 | |
8f3c5883 | 150 | printk(KERN_INFO "released %lu pages of unused memory\n", released); |
093d7b46 MR |
151 | return released; |
152 | } | |
5ead97c8 | 153 | |
68df0da7 KRW |
154 | static unsigned long __init xen_set_identity(const struct e820entry *list, |
155 | ssize_t map_size) | |
156 | { | |
157 | phys_addr_t last = xen_initial_domain() ? 0 : ISA_END_ADDRESS; | |
158 | phys_addr_t start_pci = last; | |
159 | const struct e820entry *entry; | |
160 | unsigned long identity = 0; | |
161 | int i; | |
162 | ||
163 | for (i = 0, entry = list; i < map_size; i++, entry++) { | |
164 | phys_addr_t start = entry->addr; | |
165 | phys_addr_t end = start + entry->size; | |
166 | ||
167 | if (start < last) | |
168 | start = last; | |
169 | ||
170 | if (end <= start) | |
171 | continue; | |
172 | ||
173 | /* Skip over the 1MB region. */ | |
174 | if (last > end) | |
175 | continue; | |
176 | ||
15bfc094 | 177 | if ((entry->type == E820_RAM) || (entry->type == E820_UNUSABLE)) { |
68df0da7 KRW |
178 | if (start > start_pci) |
179 | identity += set_phys_range_identity( | |
180 | PFN_UP(start_pci), PFN_DOWN(start)); | |
181 | ||
182 | /* Without saving 'last' we would gooble RAM too | |
183 | * at the end of the loop. */ | |
184 | last = end; | |
185 | start_pci = end; | |
186 | continue; | |
187 | } | |
188 | start_pci = min(start, start_pci); | |
189 | last = end; | |
190 | } | |
191 | if (last > start_pci) | |
192 | identity += set_phys_range_identity( | |
193 | PFN_UP(start_pci), PFN_DOWN(last)); | |
194 | return identity; | |
195 | } | |
d312ae87 DV |
196 | |
197 | static unsigned long __init xen_get_max_pages(void) | |
198 | { | |
199 | unsigned long max_pages = MAX_DOMAIN_PAGES; | |
200 | domid_t domid = DOMID_SELF; | |
201 | int ret; | |
202 | ||
203 | ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid); | |
204 | if (ret > 0) | |
205 | max_pages = ret; | |
206 | return min(max_pages, MAX_DOMAIN_PAGES); | |
207 | } | |
208 | ||
dc91c728 DV |
209 | static void xen_align_and_add_e820_region(u64 start, u64 size, int type) |
210 | { | |
211 | u64 end = start + size; | |
212 | ||
213 | /* Align RAM regions to page boundaries. */ | |
214 | if (type == E820_RAM) { | |
215 | start = PAGE_ALIGN(start); | |
216 | end &= ~((u64)PAGE_SIZE - 1); | |
217 | } | |
218 | ||
219 | e820_add_region(start, end - start, type); | |
220 | } | |
221 | ||
5ead97c8 JF |
222 | /** |
223 | * machine_specific_memory_setup - Hook for machine specific memory setup. | |
224 | **/ | |
5ead97c8 JF |
225 | char * __init xen_memory_setup(void) |
226 | { | |
35ae11fd IC |
227 | static struct e820entry map[E820MAX] __initdata; |
228 | ||
5ead97c8 | 229 | unsigned long max_pfn = xen_start_info->nr_pages; |
35ae11fd IC |
230 | unsigned long long mem_end; |
231 | int rc; | |
232 | struct xen_memory_map memmap; | |
dc91c728 | 233 | unsigned long max_pages; |
42ee1471 | 234 | unsigned long extra_pages = 0; |
68df0da7 | 235 | unsigned long identity_pages = 0; |
35ae11fd | 236 | int i; |
9e9a5fcb | 237 | int op; |
5ead97c8 | 238 | |
8006ec3e | 239 | max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); |
35ae11fd IC |
240 | mem_end = PFN_PHYS(max_pfn); |
241 | ||
242 | memmap.nr_entries = E820MAX; | |
243 | set_xen_guest_handle(memmap.buffer, map); | |
244 | ||
9e9a5fcb IC |
245 | op = xen_initial_domain() ? |
246 | XENMEM_machine_memory_map : | |
247 | XENMEM_memory_map; | |
248 | rc = HYPERVISOR_memory_op(op, &memmap); | |
35ae11fd | 249 | if (rc == -ENOSYS) { |
9ec23a7f | 250 | BUG_ON(xen_initial_domain()); |
35ae11fd IC |
251 | memmap.nr_entries = 1; |
252 | map[0].addr = 0ULL; | |
253 | map[0].size = mem_end; | |
254 | /* 8MB slack (to balance backend allocations). */ | |
255 | map[0].size += 8ULL << 20; | |
256 | map[0].type = E820_RAM; | |
257 | rc = 0; | |
258 | } | |
259 | BUG_ON(rc); | |
8006ec3e | 260 | |
dc91c728 DV |
261 | /* Make sure the Xen-supplied memory map is well-ordered. */ |
262 | sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries); | |
263 | ||
264 | max_pages = xen_get_max_pages(); | |
265 | if (max_pages > max_pfn) | |
266 | extra_pages += max_pages - max_pfn; | |
267 | ||
268 | xen_released_pages = xen_return_unused_memory(max_pfn, map, | |
269 | memmap.nr_entries); | |
270 | extra_pages += xen_released_pages; | |
271 | ||
272 | /* | |
273 | * Clamp the amount of extra memory to a EXTRA_MEM_RATIO | |
274 | * factor the base size. On non-highmem systems, the base | |
275 | * size is the full initial memory allocation; on highmem it | |
276 | * is limited to the max size of lowmem, so that it doesn't | |
277 | * get completely filled. | |
278 | * | |
279 | * In principle there could be a problem in lowmem systems if | |
280 | * the initial memory is also very large with respect to | |
281 | * lowmem, but we won't try to deal with that here. | |
282 | */ | |
283 | extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)), | |
284 | extra_pages); | |
285 | ||
286 | i = 0; | |
287 | while (i < memmap.nr_entries) { | |
288 | u64 addr = map[i].addr; | |
289 | u64 size = map[i].size; | |
290 | u32 type = map[i].type; | |
291 | ||
292 | if (type == E820_RAM) { | |
293 | if (addr < mem_end) { | |
294 | size = min(size, mem_end - addr); | |
295 | } else if (extra_pages) { | |
296 | size = min(size, (u64)extra_pages * PAGE_SIZE); | |
297 | extra_pages -= size / PAGE_SIZE; | |
298 | xen_add_extra_mem(addr, size); | |
299 | } else | |
300 | type = E820_UNUSABLE; | |
3654581e JF |
301 | } |
302 | ||
dc91c728 | 303 | xen_align_and_add_e820_region(addr, size, type); |
b5b43ced | 304 | |
dc91c728 DV |
305 | map[i].addr += size; |
306 | map[i].size -= size; | |
307 | if (map[i].size == 0) | |
308 | i++; | |
35ae11fd | 309 | } |
b792c755 JF |
310 | |
311 | /* | |
9ec23a7f IC |
312 | * In domU, the ISA region is normal, usable memory, but we |
313 | * reserve ISA memory anyway because too many things poke | |
b792c755 | 314 | * about in there. |
4ec5387c | 315 | * |
9ec23a7f IC |
316 | * In Dom0, the host E820 information can leave gaps in the |
317 | * ISA range, which would cause us to release those pages. To | |
318 | * avoid this, we unconditionally reserve them here. | |
b792c755 JF |
319 | */ |
320 | e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, | |
321 | E820_RESERVED); | |
5ead97c8 | 322 | |
be5bf9fa JF |
323 | /* |
324 | * Reserve Xen bits: | |
325 | * - mfn_list | |
326 | * - xen_start_info | |
327 | * See comment above "struct start_info" in <xen/interface/xen.h> | |
328 | */ | |
a9ce6bc1 | 329 | memblock_x86_reserve_range(__pa(xen_start_info->mfn_list), |
6b2e8523 JF |
330 | __pa(xen_start_info->pt_base), |
331 | "XEN START INFO"); | |
be5bf9fa JF |
332 | |
333 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
334 | ||
68df0da7 KRW |
335 | /* |
336 | * Set P2M for all non-RAM pages and E820 gaps to be identity | |
dc91c728 | 337 | * type PFNs. |
68df0da7 | 338 | */ |
dc91c728 | 339 | identity_pages = xen_set_identity(e820.map, e820.nr_map); |
68df0da7 | 340 | printk(KERN_INFO "Set %ld page(s) to 1-1 mapping.\n", identity_pages); |
5ead97c8 JF |
341 | return "Xen"; |
342 | } | |
343 | ||
d2eea68e RM |
344 | /* |
345 | * Set the bit indicating "nosegneg" library variants should be used. | |
6a52e4b1 JF |
346 | * We only need to bother in pure 32-bit mode; compat 32-bit processes |
347 | * can have un-truncated segments, so wrapping around is allowed. | |
d2eea68e | 348 | */ |
08b6d290 | 349 | static void __init fiddle_vdso(void) |
d2eea68e | 350 | { |
6a52e4b1 JF |
351 | #ifdef CONFIG_X86_32 |
352 | u32 *mask; | |
353 | mask = VDSO32_SYMBOL(&vdso32_int80_start, NOTE_MASK); | |
354 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; | |
355 | mask = VDSO32_SYMBOL(&vdso32_sysenter_start, NOTE_MASK); | |
d2eea68e | 356 | *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
6fcac6d3 | 357 | #endif |
d2eea68e RM |
358 | } |
359 | ||
ae15a3b4 | 360 | static int __cpuinit register_callback(unsigned type, const void *func) |
e2a81baf | 361 | { |
88459d4c JF |
362 | struct callback_register callback = { |
363 | .type = type, | |
364 | .address = XEN_CALLBACK(__KERNEL_CS, func), | |
e2a81baf JF |
365 | .flags = CALLBACKF_mask_events, |
366 | }; | |
367 | ||
88459d4c JF |
368 | return HYPERVISOR_callback_op(CALLBACKOP_register, &callback); |
369 | } | |
370 | ||
371 | void __cpuinit xen_enable_sysenter(void) | |
372 | { | |
6fcac6d3 | 373 | int ret; |
62541c37 | 374 | unsigned sysenter_feature; |
6fcac6d3 JF |
375 | |
376 | #ifdef CONFIG_X86_32 | |
62541c37 | 377 | sysenter_feature = X86_FEATURE_SEP; |
6fcac6d3 | 378 | #else |
62541c37 | 379 | sysenter_feature = X86_FEATURE_SYSENTER32; |
6fcac6d3 | 380 | #endif |
88459d4c | 381 | |
62541c37 JF |
382 | if (!boot_cpu_has(sysenter_feature)) |
383 | return; | |
384 | ||
6fcac6d3 | 385 | ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target); |
62541c37 JF |
386 | if(ret != 0) |
387 | setup_clear_cpu_cap(sysenter_feature); | |
e2a81baf JF |
388 | } |
389 | ||
6fcac6d3 JF |
390 | void __cpuinit xen_enable_syscall(void) |
391 | { | |
392 | #ifdef CONFIG_X86_64 | |
6fcac6d3 | 393 | int ret; |
6fcac6d3 JF |
394 | |
395 | ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target); | |
396 | if (ret != 0) { | |
d5303b81 | 397 | printk(KERN_ERR "Failed to set syscall callback: %d\n", ret); |
62541c37 JF |
398 | /* Pretty fatal; 64-bit userspace has no other |
399 | mechanism for syscalls. */ | |
400 | } | |
401 | ||
402 | if (boot_cpu_has(X86_FEATURE_SYSCALL32)) { | |
6fcac6d3 JF |
403 | ret = register_callback(CALLBACKTYPE_syscall32, |
404 | xen_syscall32_target); | |
d5303b81 | 405 | if (ret != 0) |
62541c37 | 406 | setup_clear_cpu_cap(X86_FEATURE_SYSCALL32); |
6fcac6d3 JF |
407 | } |
408 | #endif /* CONFIG_X86_64 */ | |
409 | } | |
410 | ||
5ead97c8 JF |
411 | void __init xen_arch_setup(void) |
412 | { | |
f09f6d19 DD |
413 | xen_panic_handler_init(); |
414 | ||
5ead97c8 JF |
415 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments); |
416 | HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables); | |
417 | ||
418 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
f63c2f24 T |
419 | HYPERVISOR_vm_assist(VMASST_CMD_enable, |
420 | VMASST_TYPE_pae_extended_cr3); | |
5ead97c8 | 421 | |
88459d4c JF |
422 | if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) || |
423 | register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback)) | |
424 | BUG(); | |
5ead97c8 | 425 | |
e2a81baf | 426 | xen_enable_sysenter(); |
6fcac6d3 | 427 | xen_enable_syscall(); |
e2a81baf | 428 | |
5ead97c8 JF |
429 | #ifdef CONFIG_ACPI |
430 | if (!(xen_start_info->flags & SIF_INITDOMAIN)) { | |
431 | printk(KERN_INFO "ACPI in unprivileged domain disabled\n"); | |
432 | disable_acpi(); | |
433 | } | |
434 | #endif | |
435 | ||
436 | memcpy(boot_command_line, xen_start_info->cmd_line, | |
437 | MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ? | |
438 | COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE); | |
439 | ||
bc15fde7 JF |
440 | /* Set up idle, making sure it calls safe_halt() pvop */ |
441 | #ifdef CONFIG_X86_32 | |
442 | boot_cpu_data.hlt_works_ok = 1; | |
443 | #endif | |
d91ee586 | 444 | disable_cpuidle(); |
23febedd | 445 | boot_option_idle_override = IDLE_HALT; |
f87e4cac | 446 | |
d2eea68e | 447 | fiddle_vdso(); |
5ead97c8 | 448 | } |