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7ce0bcfd ZA |
1 | /* |
2 | * VMI specific paravirt-ops implementation | |
3 | * | |
4 | * Copyright (C) 2005, VMware, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
14 | * NON INFRINGEMENT. See the GNU General Public License for more | |
15 | * details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | * | |
21 | * Send feedback to zach@vmware.com | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/license.h> | |
27 | #include <linux/cpu.h> | |
28 | #include <linux/bootmem.h> | |
29 | #include <linux/mm.h> | |
30 | #include <asm/vmi.h> | |
31 | #include <asm/io.h> | |
32 | #include <asm/fixmap.h> | |
33 | #include <asm/apicdef.h> | |
34 | #include <asm/apic.h> | |
35 | #include <asm/processor.h> | |
36 | #include <asm/timer.h> | |
bbab4f3b | 37 | #include <asm/vmi_time.h> |
7ce0bcfd ZA |
38 | |
39 | /* Convenient for calling VMI functions indirectly in the ROM */ | |
40 | typedef u32 __attribute__((regparm(1))) (VROMFUNC)(void); | |
41 | typedef u64 __attribute__((regparm(2))) (VROMLONGFUNC)(int); | |
42 | ||
43 | #define call_vrom_func(rom,func) \ | |
44 | (((VROMFUNC *)(rom->func))()) | |
45 | ||
46 | #define call_vrom_long_func(rom,func,arg) \ | |
47 | (((VROMLONGFUNC *)(rom->func)) (arg)) | |
48 | ||
49 | static struct vrom_header *vmi_rom; | |
50 | static int license_gplok; | |
51 | static int disable_nodelay; | |
52 | static int disable_pge; | |
53 | static int disable_pse; | |
54 | static int disable_sep; | |
55 | static int disable_tsc; | |
56 | static int disable_mtrr; | |
7507ba34 | 57 | static int disable_noidle; |
7ce0bcfd ZA |
58 | |
59 | /* Cached VMI operations */ | |
60 | struct { | |
61 | void (*cpuid)(void /* non-c */); | |
62 | void (*_set_ldt)(u32 selector); | |
63 | void (*set_tr)(u32 selector); | |
64 | void (*set_kernel_stack)(u32 selector, u32 esp0); | |
65 | void (*allocate_page)(u32, u32, u32, u32, u32); | |
66 | void (*release_page)(u32, u32); | |
67 | void (*set_pte)(pte_t, pte_t *, unsigned); | |
68 | void (*update_pte)(pte_t *, unsigned); | |
69 | void (*set_linear_mapping)(int, u32, u32, u32); | |
70 | void (*flush_tlb)(int); | |
71 | void (*set_initial_ap_state)(int, int); | |
bbab4f3b | 72 | void (*halt)(void); |
7ce0bcfd ZA |
73 | } vmi_ops; |
74 | ||
75 | /* XXX move this to alternative.h */ | |
76 | extern struct paravirt_patch __start_parainstructions[], | |
77 | __stop_parainstructions[]; | |
78 | ||
79 | /* | |
80 | * VMI patching routines. | |
81 | */ | |
82 | #define MNEM_CALL 0xe8 | |
83 | #define MNEM_JMP 0xe9 | |
84 | #define MNEM_RET 0xc3 | |
85 | ||
86 | static char irq_save_disable_callout[] = { | |
87 | MNEM_CALL, 0, 0, 0, 0, | |
88 | MNEM_CALL, 0, 0, 0, 0, | |
89 | MNEM_RET | |
90 | }; | |
91 | #define IRQ_PATCH_INT_MASK 0 | |
92 | #define IRQ_PATCH_DISABLE 5 | |
93 | ||
94 | static inline void patch_offset(unsigned char *eip, unsigned char *dest) | |
95 | { | |
96 | *(unsigned long *)(eip+1) = dest-eip-5; | |
97 | } | |
98 | ||
99 | static unsigned patch_internal(int call, unsigned len, void *insns) | |
100 | { | |
101 | u64 reloc; | |
102 | struct vmi_relocation_info *const rel = (struct vmi_relocation_info *)&reloc; | |
103 | reloc = call_vrom_long_func(vmi_rom, get_reloc, call); | |
104 | switch(rel->type) { | |
105 | case VMI_RELOCATION_CALL_REL: | |
106 | BUG_ON(len < 5); | |
107 | *(char *)insns = MNEM_CALL; | |
108 | patch_offset(insns, rel->eip); | |
109 | return 5; | |
110 | ||
111 | case VMI_RELOCATION_JUMP_REL: | |
112 | BUG_ON(len < 5); | |
113 | *(char *)insns = MNEM_JMP; | |
114 | patch_offset(insns, rel->eip); | |
115 | return 5; | |
116 | ||
117 | case VMI_RELOCATION_NOP: | |
118 | /* obliterate the whole thing */ | |
119 | return 0; | |
120 | ||
121 | case VMI_RELOCATION_NONE: | |
122 | /* leave native code in place */ | |
123 | break; | |
124 | ||
125 | default: | |
126 | BUG(); | |
127 | } | |
128 | return len; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Apply patch if appropriate, return length of new instruction | |
133 | * sequence. The callee does nop padding for us. | |
134 | */ | |
135 | static unsigned vmi_patch(u8 type, u16 clobbers, void *insns, unsigned len) | |
136 | { | |
137 | switch (type) { | |
138 | case PARAVIRT_IRQ_DISABLE: | |
139 | return patch_internal(VMI_CALL_DisableInterrupts, len, insns); | |
140 | case PARAVIRT_IRQ_ENABLE: | |
141 | return patch_internal(VMI_CALL_EnableInterrupts, len, insns); | |
142 | case PARAVIRT_RESTORE_FLAGS: | |
143 | return patch_internal(VMI_CALL_SetInterruptMask, len, insns); | |
144 | case PARAVIRT_SAVE_FLAGS: | |
145 | return patch_internal(VMI_CALL_GetInterruptMask, len, insns); | |
146 | case PARAVIRT_SAVE_FLAGS_IRQ_DISABLE: | |
147 | if (len >= 10) { | |
148 | patch_internal(VMI_CALL_GetInterruptMask, len, insns); | |
149 | patch_internal(VMI_CALL_DisableInterrupts, len-5, insns+5); | |
150 | return 10; | |
151 | } else { | |
152 | /* | |
153 | * You bastards didn't leave enough room to | |
154 | * patch save_flags_irq_disable inline. Patch | |
155 | * to a helper | |
156 | */ | |
157 | BUG_ON(len < 5); | |
158 | *(char *)insns = MNEM_CALL; | |
159 | patch_offset(insns, irq_save_disable_callout); | |
160 | return 5; | |
161 | } | |
162 | case PARAVIRT_INTERRUPT_RETURN: | |
163 | return patch_internal(VMI_CALL_IRET, len, insns); | |
164 | case PARAVIRT_STI_SYSEXIT: | |
165 | return patch_internal(VMI_CALL_SYSEXIT, len, insns); | |
166 | default: | |
167 | break; | |
168 | } | |
169 | return len; | |
170 | } | |
171 | ||
172 | /* CPUID has non-C semantics, and paravirt-ops API doesn't match hardware ISA */ | |
173 | static void vmi_cpuid(unsigned int *eax, unsigned int *ebx, | |
174 | unsigned int *ecx, unsigned int *edx) | |
175 | { | |
176 | int override = 0; | |
177 | if (*eax == 1) | |
178 | override = 1; | |
179 | asm volatile ("call *%6" | |
180 | : "=a" (*eax), | |
181 | "=b" (*ebx), | |
182 | "=c" (*ecx), | |
183 | "=d" (*edx) | |
184 | : "0" (*eax), "2" (*ecx), "r" (vmi_ops.cpuid)); | |
185 | if (override) { | |
186 | if (disable_pse) | |
187 | *edx &= ~X86_FEATURE_PSE; | |
188 | if (disable_pge) | |
189 | *edx &= ~X86_FEATURE_PGE; | |
190 | if (disable_sep) | |
191 | *edx &= ~X86_FEATURE_SEP; | |
192 | if (disable_tsc) | |
193 | *edx &= ~X86_FEATURE_TSC; | |
194 | if (disable_mtrr) | |
195 | *edx &= ~X86_FEATURE_MTRR; | |
196 | } | |
197 | } | |
198 | ||
199 | static inline void vmi_maybe_load_tls(struct desc_struct *gdt, int nr, struct desc_struct *new) | |
200 | { | |
201 | if (gdt[nr].a != new->a || gdt[nr].b != new->b) | |
202 | write_gdt_entry(gdt, nr, new->a, new->b); | |
203 | } | |
204 | ||
205 | static void vmi_load_tls(struct thread_struct *t, unsigned int cpu) | |
206 | { | |
207 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
208 | vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 0, &t->tls_array[0]); | |
209 | vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 1, &t->tls_array[1]); | |
210 | vmi_maybe_load_tls(gdt, GDT_ENTRY_TLS_MIN + 2, &t->tls_array[2]); | |
211 | } | |
212 | ||
213 | static void vmi_set_ldt(const void *addr, unsigned entries) | |
214 | { | |
215 | unsigned cpu = smp_processor_id(); | |
216 | u32 low, high; | |
217 | ||
218 | pack_descriptor(&low, &high, (unsigned long)addr, | |
219 | entries * sizeof(struct desc_struct) - 1, | |
220 | DESCTYPE_LDT, 0); | |
221 | write_gdt_entry(get_cpu_gdt_table(cpu), GDT_ENTRY_LDT, low, high); | |
222 | vmi_ops._set_ldt(entries ? GDT_ENTRY_LDT*sizeof(struct desc_struct) : 0); | |
223 | } | |
224 | ||
225 | static void vmi_set_tr(void) | |
226 | { | |
227 | vmi_ops.set_tr(GDT_ENTRY_TSS*sizeof(struct desc_struct)); | |
228 | } | |
229 | ||
230 | static void vmi_load_esp0(struct tss_struct *tss, | |
231 | struct thread_struct *thread) | |
232 | { | |
233 | tss->esp0 = thread->esp0; | |
234 | ||
235 | /* This can only happen when SEP is enabled, no need to test "SEP"arately */ | |
236 | if (unlikely(tss->ss1 != thread->sysenter_cs)) { | |
237 | tss->ss1 = thread->sysenter_cs; | |
238 | wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); | |
239 | } | |
240 | vmi_ops.set_kernel_stack(__KERNEL_DS, tss->esp0); | |
241 | } | |
242 | ||
243 | static void vmi_flush_tlb_user(void) | |
244 | { | |
245 | vmi_ops.flush_tlb(VMI_FLUSH_TLB); | |
246 | } | |
247 | ||
248 | static void vmi_flush_tlb_kernel(void) | |
249 | { | |
250 | vmi_ops.flush_tlb(VMI_FLUSH_TLB | VMI_FLUSH_GLOBAL); | |
251 | } | |
252 | ||
253 | /* Stub to do nothing at all; used for delays and unimplemented calls */ | |
254 | static void vmi_nop(void) | |
255 | { | |
256 | } | |
257 | ||
bbab4f3b | 258 | /* For NO_IDLE_HZ, we stop the clock when halting the kernel */ |
bbab4f3b ZA |
259 | static fastcall void vmi_safe_halt(void) |
260 | { | |
261 | int idle = vmi_stop_hz_timer(); | |
262 | vmi_ops.halt(); | |
263 | if (idle) { | |
264 | local_irq_disable(); | |
265 | vmi_account_time_restart_hz_timer(); | |
266 | local_irq_enable(); | |
267 | } | |
268 | } | |
7ce0bcfd ZA |
269 | |
270 | #ifdef CONFIG_DEBUG_PAGE_TYPE | |
271 | ||
272 | #ifdef CONFIG_X86_PAE | |
273 | #define MAX_BOOT_PTS (2048+4+1) | |
274 | #else | |
275 | #define MAX_BOOT_PTS (1024+1) | |
276 | #endif | |
277 | ||
278 | /* | |
279 | * During boot, mem_map is not yet available in paging_init, so stash | |
280 | * all the boot page allocations here. | |
281 | */ | |
282 | static struct { | |
283 | u32 pfn; | |
284 | int type; | |
285 | } boot_page_allocations[MAX_BOOT_PTS]; | |
286 | static int num_boot_page_allocations; | |
287 | static int boot_allocations_applied; | |
288 | ||
289 | void vmi_apply_boot_page_allocations(void) | |
290 | { | |
291 | int i; | |
292 | BUG_ON(!mem_map); | |
293 | for (i = 0; i < num_boot_page_allocations; i++) { | |
294 | struct page *page = pfn_to_page(boot_page_allocations[i].pfn); | |
295 | page->type = boot_page_allocations[i].type; | |
296 | page->type = boot_page_allocations[i].type & | |
297 | ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE); | |
298 | } | |
299 | boot_allocations_applied = 1; | |
300 | } | |
301 | ||
302 | static void record_page_type(u32 pfn, int type) | |
303 | { | |
304 | BUG_ON(num_boot_page_allocations >= MAX_BOOT_PTS); | |
305 | boot_page_allocations[num_boot_page_allocations].pfn = pfn; | |
306 | boot_page_allocations[num_boot_page_allocations].type = type; | |
307 | num_boot_page_allocations++; | |
308 | } | |
309 | ||
310 | static void check_zeroed_page(u32 pfn, int type, struct page *page) | |
311 | { | |
312 | u32 *ptr; | |
313 | int i; | |
314 | int limit = PAGE_SIZE / sizeof(int); | |
315 | ||
316 | if (page_address(page)) | |
317 | ptr = (u32 *)page_address(page); | |
318 | else | |
319 | ptr = (u32 *)__va(pfn << PAGE_SHIFT); | |
320 | /* | |
321 | * When cloning the root in non-PAE mode, only the userspace | |
322 | * pdes need to be zeroed. | |
323 | */ | |
324 | if (type & VMI_PAGE_CLONE) | |
325 | limit = USER_PTRS_PER_PGD; | |
326 | for (i = 0; i < limit; i++) | |
327 | BUG_ON(ptr[i]); | |
328 | } | |
329 | ||
330 | /* | |
331 | * We stash the page type into struct page so we can verify the page | |
332 | * types are used properly. | |
333 | */ | |
334 | static void vmi_set_page_type(u32 pfn, int type) | |
335 | { | |
336 | /* PAE can have multiple roots per page - don't track */ | |
337 | if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP)) | |
338 | return; | |
339 | ||
340 | if (boot_allocations_applied) { | |
341 | struct page *page = pfn_to_page(pfn); | |
342 | if (type != VMI_PAGE_NORMAL) | |
343 | BUG_ON(page->type); | |
344 | else | |
345 | BUG_ON(page->type == VMI_PAGE_NORMAL); | |
346 | page->type = type & ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE); | |
347 | if (type & VMI_PAGE_ZEROED) | |
348 | check_zeroed_page(pfn, type, page); | |
349 | } else { | |
350 | record_page_type(pfn, type); | |
351 | } | |
352 | } | |
353 | ||
354 | static void vmi_check_page_type(u32 pfn, int type) | |
355 | { | |
356 | /* PAE can have multiple roots per page - skip checks */ | |
357 | if (PTRS_PER_PMD > 1 && (type & VMI_PAGE_PDP)) | |
358 | return; | |
359 | ||
360 | type &= ~(VMI_PAGE_ZEROED | VMI_PAGE_CLONE); | |
361 | if (boot_allocations_applied) { | |
362 | struct page *page = pfn_to_page(pfn); | |
363 | BUG_ON((page->type ^ type) & VMI_PAGE_PAE); | |
364 | BUG_ON(type == VMI_PAGE_NORMAL && page->type); | |
365 | BUG_ON((type & page->type) == 0); | |
366 | } | |
367 | } | |
368 | #else | |
369 | #define vmi_set_page_type(p,t) do { } while (0) | |
370 | #define vmi_check_page_type(p,t) do { } while (0) | |
371 | #endif | |
372 | ||
373 | static void vmi_allocate_pt(u32 pfn) | |
374 | { | |
375 | vmi_set_page_type(pfn, VMI_PAGE_L1); | |
376 | vmi_ops.allocate_page(pfn, VMI_PAGE_L1, 0, 0, 0); | |
377 | } | |
378 | ||
379 | static void vmi_allocate_pd(u32 pfn) | |
380 | { | |
381 | /* | |
382 | * This call comes in very early, before mem_map is setup. | |
383 | * It is called only for swapper_pg_dir, which already has | |
384 | * data on it. | |
385 | */ | |
386 | vmi_set_page_type(pfn, VMI_PAGE_L2); | |
387 | vmi_ops.allocate_page(pfn, VMI_PAGE_L2, 0, 0, 0); | |
388 | } | |
389 | ||
390 | static void vmi_allocate_pd_clone(u32 pfn, u32 clonepfn, u32 start, u32 count) | |
391 | { | |
392 | vmi_set_page_type(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE); | |
393 | vmi_check_page_type(clonepfn, VMI_PAGE_L2); | |
394 | vmi_ops.allocate_page(pfn, VMI_PAGE_L2 | VMI_PAGE_CLONE, clonepfn, start, count); | |
395 | } | |
396 | ||
397 | static void vmi_release_pt(u32 pfn) | |
398 | { | |
399 | vmi_ops.release_page(pfn, VMI_PAGE_L1); | |
400 | vmi_set_page_type(pfn, VMI_PAGE_NORMAL); | |
401 | } | |
402 | ||
403 | static void vmi_release_pd(u32 pfn) | |
404 | { | |
405 | vmi_ops.release_page(pfn, VMI_PAGE_L2); | |
406 | vmi_set_page_type(pfn, VMI_PAGE_NORMAL); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Helper macros for MMU update flags. We can defer updates until a flush | |
411 | * or page invalidation only if the update is to the current address space | |
412 | * (otherwise, there is no flush). We must check against init_mm, since | |
413 | * this could be a kernel update, which usually passes init_mm, although | |
414 | * sometimes this check can be skipped if we know the particular function | |
415 | * is only called on user mode PTEs. We could change the kernel to pass | |
416 | * current->active_mm here, but in particular, I was unsure if changing | |
417 | * mm/highmem.c to do this would still be correct on other architectures. | |
418 | */ | |
419 | #define is_current_as(mm, mustbeuser) ((mm) == current->active_mm || \ | |
420 | (!mustbeuser && (mm) == &init_mm)) | |
421 | #define vmi_flags_addr(mm, addr, level, user) \ | |
422 | ((level) | (is_current_as(mm, user) ? \ | |
423 | (VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0)) | |
424 | #define vmi_flags_addr_defer(mm, addr, level, user) \ | |
425 | ((level) | (is_current_as(mm, user) ? \ | |
426 | (VMI_PAGE_DEFER | VMI_PAGE_CURRENT_AS | ((addr) & VMI_PAGE_VA_MASK)) : 0)) | |
427 | ||
428 | static void vmi_update_pte(struct mm_struct *mm, u32 addr, pte_t *ptep) | |
429 | { | |
430 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE); | |
431 | vmi_ops.update_pte(ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0)); | |
432 | } | |
433 | ||
434 | static void vmi_update_pte_defer(struct mm_struct *mm, u32 addr, pte_t *ptep) | |
435 | { | |
436 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE); | |
437 | vmi_ops.update_pte(ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 0)); | |
438 | } | |
439 | ||
440 | static void vmi_set_pte(pte_t *ptep, pte_t pte) | |
441 | { | |
442 | /* XXX because of set_pmd_pte, this can be called on PT or PD layers */ | |
443 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE | VMI_PAGE_PD); | |
444 | vmi_ops.set_pte(pte, ptep, VMI_PAGE_PT); | |
445 | } | |
446 | ||
447 | static void vmi_set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pte) | |
448 | { | |
449 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE); | |
450 | vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0)); | |
451 | } | |
452 | ||
453 | static void vmi_set_pmd(pmd_t *pmdp, pmd_t pmdval) | |
454 | { | |
455 | #ifdef CONFIG_X86_PAE | |
456 | const pte_t pte = { pmdval.pmd, pmdval.pmd >> 32 }; | |
457 | vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PMD); | |
458 | #else | |
459 | const pte_t pte = { pmdval.pud.pgd.pgd }; | |
460 | vmi_check_page_type(__pa(pmdp) >> PAGE_SHIFT, VMI_PAGE_PGD); | |
461 | #endif | |
462 | vmi_ops.set_pte(pte, (pte_t *)pmdp, VMI_PAGE_PD); | |
463 | } | |
464 | ||
465 | #ifdef CONFIG_X86_PAE | |
466 | ||
467 | static void vmi_set_pte_atomic(pte_t *ptep, pte_t pteval) | |
468 | { | |
469 | /* | |
470 | * XXX This is called from set_pmd_pte, but at both PT | |
471 | * and PD layers so the VMI_PAGE_PT flag is wrong. But | |
472 | * it is only called for large page mapping changes, | |
473 | * the Xen backend, doesn't support large pages, and the | |
474 | * ESX backend doesn't depend on the flag. | |
475 | */ | |
476 | set_64bit((unsigned long long *)ptep,pte_val(pteval)); | |
477 | vmi_ops.update_pte(ptep, VMI_PAGE_PT); | |
478 | } | |
479 | ||
480 | static void vmi_set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) | |
481 | { | |
482 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE); | |
483 | vmi_ops.set_pte(pte, ptep, vmi_flags_addr_defer(mm, addr, VMI_PAGE_PT, 1)); | |
484 | } | |
485 | ||
486 | static void vmi_set_pud(pud_t *pudp, pud_t pudval) | |
487 | { | |
488 | /* Um, eww */ | |
489 | const pte_t pte = { pudval.pgd.pgd, pudval.pgd.pgd >> 32 }; | |
490 | vmi_check_page_type(__pa(pudp) >> PAGE_SHIFT, VMI_PAGE_PGD); | |
491 | vmi_ops.set_pte(pte, (pte_t *)pudp, VMI_PAGE_PDP); | |
492 | } | |
493 | ||
494 | static void vmi_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
495 | { | |
496 | const pte_t pte = { 0 }; | |
497 | vmi_check_page_type(__pa(ptep) >> PAGE_SHIFT, VMI_PAGE_PTE); | |
498 | vmi_ops.set_pte(pte, ptep, vmi_flags_addr(mm, addr, VMI_PAGE_PT, 0)); | |
499 | } | |
500 | ||
501 | void vmi_pmd_clear(pmd_t *pmd) | |
502 | { | |
503 | const pte_t pte = { 0 }; | |
504 | vmi_check_page_type(__pa(pmd) >> PAGE_SHIFT, VMI_PAGE_PMD); | |
505 | vmi_ops.set_pte(pte, (pte_t *)pmd, VMI_PAGE_PD); | |
506 | } | |
507 | #endif | |
508 | ||
509 | #ifdef CONFIG_SMP | |
510 | struct vmi_ap_state ap; | |
511 | extern void setup_pda(void); | |
512 | ||
513 | static void __init /* XXX cpu hotplug */ | |
514 | vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip, | |
515 | unsigned long start_esp) | |
516 | { | |
517 | /* Default everything to zero. This is fine for most GPRs. */ | |
518 | memset(&ap, 0, sizeof(struct vmi_ap_state)); | |
519 | ||
520 | ap.gdtr_limit = GDT_SIZE - 1; | |
521 | ap.gdtr_base = (unsigned long) get_cpu_gdt_table(phys_apicid); | |
522 | ||
523 | ap.idtr_limit = IDT_ENTRIES * 8 - 1; | |
524 | ap.idtr_base = (unsigned long) idt_table; | |
525 | ||
526 | ap.ldtr = 0; | |
527 | ||
528 | ap.cs = __KERNEL_CS; | |
529 | ap.eip = (unsigned long) start_eip; | |
530 | ap.ss = __KERNEL_DS; | |
531 | ap.esp = (unsigned long) start_esp; | |
532 | ||
533 | ap.ds = __USER_DS; | |
534 | ap.es = __USER_DS; | |
535 | ap.fs = __KERNEL_PDA; | |
536 | ap.gs = 0; | |
537 | ||
538 | ap.eflags = 0; | |
539 | ||
540 | setup_pda(); | |
541 | ||
542 | #ifdef CONFIG_X86_PAE | |
543 | /* efer should match BSP efer. */ | |
544 | if (cpu_has_nx) { | |
545 | unsigned l, h; | |
546 | rdmsr(MSR_EFER, l, h); | |
547 | ap.efer = (unsigned long long) h << 32 | l; | |
548 | } | |
549 | #endif | |
550 | ||
551 | ap.cr3 = __pa(swapper_pg_dir); | |
552 | /* Protected mode, paging, AM, WP, NE, MP. */ | |
553 | ap.cr0 = 0x80050023; | |
554 | ap.cr4 = mmu_cr4_features; | |
555 | vmi_ops.set_initial_ap_state(__pa(&ap), phys_apicid); | |
556 | } | |
557 | #endif | |
558 | ||
559 | static inline int __init check_vmi_rom(struct vrom_header *rom) | |
560 | { | |
561 | struct pci_header *pci; | |
562 | struct pnp_header *pnp; | |
563 | const char *manufacturer = "UNKNOWN"; | |
564 | const char *product = "UNKNOWN"; | |
565 | const char *license = "unspecified"; | |
566 | ||
567 | if (rom->rom_signature != 0xaa55) | |
568 | return 0; | |
569 | if (rom->vrom_signature != VMI_SIGNATURE) | |
570 | return 0; | |
571 | if (rom->api_version_maj != VMI_API_REV_MAJOR || | |
572 | rom->api_version_min+1 < VMI_API_REV_MINOR+1) { | |
573 | printk(KERN_WARNING "VMI: Found mismatched rom version %d.%d\n", | |
574 | rom->api_version_maj, | |
575 | rom->api_version_min); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* | |
580 | * Relying on the VMI_SIGNATURE field is not 100% safe, so check | |
581 | * the PCI header and device type to make sure this is really a | |
582 | * VMI device. | |
583 | */ | |
584 | if (!rom->pci_header_offs) { | |
585 | printk(KERN_WARNING "VMI: ROM does not contain PCI header.\n"); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | pci = (struct pci_header *)((char *)rom+rom->pci_header_offs); | |
590 | if (pci->vendorID != PCI_VENDOR_ID_VMWARE || | |
591 | pci->deviceID != PCI_DEVICE_ID_VMWARE_VMI) { | |
592 | /* Allow it to run... anyways, but warn */ | |
593 | printk(KERN_WARNING "VMI: ROM from unknown manufacturer\n"); | |
594 | } | |
595 | ||
596 | if (rom->pnp_header_offs) { | |
597 | pnp = (struct pnp_header *)((char *)rom+rom->pnp_header_offs); | |
598 | if (pnp->manufacturer_offset) | |
599 | manufacturer = (const char *)rom+pnp->manufacturer_offset; | |
600 | if (pnp->product_offset) | |
601 | product = (const char *)rom+pnp->product_offset; | |
602 | } | |
603 | ||
604 | if (rom->license_offs) | |
605 | license = (char *)rom+rom->license_offs; | |
606 | ||
607 | printk(KERN_INFO "VMI: Found %s %s, API version %d.%d, ROM version %d.%d\n", | |
608 | manufacturer, product, | |
609 | rom->api_version_maj, rom->api_version_min, | |
610 | pci->rom_version_maj, pci->rom_version_min); | |
611 | ||
612 | license_gplok = license_is_gpl_compatible(license); | |
613 | if (!license_gplok) { | |
614 | printk(KERN_WARNING "VMI: ROM license '%s' taints kernel... " | |
615 | "inlining disabled\n", | |
616 | license); | |
617 | add_taint(TAINT_PROPRIETARY_MODULE); | |
618 | } | |
619 | return 1; | |
620 | } | |
621 | ||
622 | /* | |
623 | * Probe for the VMI option ROM | |
624 | */ | |
625 | static inline int __init probe_vmi_rom(void) | |
626 | { | |
627 | unsigned long base; | |
628 | ||
629 | /* VMI ROM is in option ROM area, check signature */ | |
630 | for (base = 0xC0000; base < 0xE0000; base += 2048) { | |
631 | struct vrom_header *romstart; | |
632 | romstart = (struct vrom_header *)isa_bus_to_virt(base); | |
633 | if (check_vmi_rom(romstart)) { | |
634 | vmi_rom = romstart; | |
635 | return 1; | |
636 | } | |
637 | } | |
638 | return 0; | |
639 | } | |
640 | ||
641 | /* | |
642 | * VMI setup common to all processors | |
643 | */ | |
644 | void vmi_bringup(void) | |
645 | { | |
646 | /* We must establish the lowmem mapping for MMU ops to work */ | |
647 | if (vmi_rom) | |
648 | vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0); | |
649 | } | |
650 | ||
651 | /* | |
652 | * Return a pointer to the VMI function or a NOP stub | |
653 | */ | |
654 | static void *vmi_get_function(int vmicall) | |
655 | { | |
656 | u64 reloc; | |
657 | const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc; | |
658 | reloc = call_vrom_long_func(vmi_rom, get_reloc, vmicall); | |
659 | BUG_ON(rel->type == VMI_RELOCATION_JUMP_REL); | |
660 | if (rel->type == VMI_RELOCATION_CALL_REL) | |
661 | return (void *)rel->eip; | |
662 | else | |
663 | return (void *)vmi_nop; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Helper macro for making the VMI paravirt-ops fill code readable. | |
668 | * For unimplemented operations, fall back to default. | |
669 | */ | |
670 | #define para_fill(opname, vmicall) \ | |
671 | do { \ | |
672 | reloc = call_vrom_long_func(vmi_rom, get_reloc, \ | |
673 | VMI_CALL_##vmicall); \ | |
674 | if (rel->type != VMI_RELOCATION_NONE) { \ | |
675 | BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); \ | |
676 | paravirt_ops.opname = (void *)rel->eip; \ | |
677 | } \ | |
678 | } while (0) | |
679 | ||
680 | /* | |
681 | * Activate the VMI interface and switch into paravirtualized mode | |
682 | */ | |
683 | static inline int __init activate_vmi(void) | |
684 | { | |
685 | short kernel_cs; | |
686 | u64 reloc; | |
687 | const struct vmi_relocation_info *rel = (struct vmi_relocation_info *)&reloc; | |
688 | ||
689 | if (call_vrom_func(vmi_rom, vmi_init) != 0) { | |
690 | printk(KERN_ERR "VMI ROM failed to initialize!"); | |
691 | return 0; | |
692 | } | |
693 | savesegment(cs, kernel_cs); | |
694 | ||
695 | paravirt_ops.paravirt_enabled = 1; | |
696 | paravirt_ops.kernel_rpl = kernel_cs & SEGMENT_RPL_MASK; | |
697 | ||
698 | paravirt_ops.patch = vmi_patch; | |
699 | paravirt_ops.name = "vmi"; | |
700 | ||
701 | /* | |
702 | * Many of these operations are ABI compatible with VMI. | |
703 | * This means we can fill in the paravirt-ops with direct | |
704 | * pointers into the VMI ROM. If the calling convention for | |
705 | * these operations changes, this code needs to be updated. | |
706 | * | |
707 | * Exceptions | |
708 | * CPUID paravirt-op uses pointers, not the native ISA | |
709 | * halt has no VMI equivalent; all VMI halts are "safe" | |
710 | * no MSR support yet - just trap and emulate. VMI uses the | |
711 | * same ABI as the native ISA, but Linux wants exceptions | |
712 | * from bogus MSR read / write handled | |
713 | * rdpmc is not yet used in Linux | |
714 | */ | |
715 | ||
716 | /* CPUID is special, so very special */ | |
717 | reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_CPUID); | |
718 | if (rel->type != VMI_RELOCATION_NONE) { | |
719 | BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); | |
720 | vmi_ops.cpuid = (void *)rel->eip; | |
721 | paravirt_ops.cpuid = vmi_cpuid; | |
722 | } | |
723 | ||
724 | para_fill(clts, CLTS); | |
725 | para_fill(get_debugreg, GetDR); | |
726 | para_fill(set_debugreg, SetDR); | |
727 | para_fill(read_cr0, GetCR0); | |
728 | para_fill(read_cr2, GetCR2); | |
729 | para_fill(read_cr3, GetCR3); | |
730 | para_fill(read_cr4, GetCR4); | |
731 | para_fill(write_cr0, SetCR0); | |
732 | para_fill(write_cr2, SetCR2); | |
733 | para_fill(write_cr3, SetCR3); | |
734 | para_fill(write_cr4, SetCR4); | |
735 | para_fill(save_fl, GetInterruptMask); | |
736 | para_fill(restore_fl, SetInterruptMask); | |
737 | para_fill(irq_disable, DisableInterrupts); | |
738 | para_fill(irq_enable, EnableInterrupts); | |
739 | /* irq_save_disable !!! sheer pain */ | |
740 | patch_offset(&irq_save_disable_callout[IRQ_PATCH_INT_MASK], | |
741 | (char *)paravirt_ops.save_fl); | |
742 | patch_offset(&irq_save_disable_callout[IRQ_PATCH_DISABLE], | |
743 | (char *)paravirt_ops.irq_disable); | |
7507ba34 | 744 | |
7ce0bcfd ZA |
745 | para_fill(wbinvd, WBINVD); |
746 | /* paravirt_ops.read_msr = vmi_rdmsr */ | |
747 | /* paravirt_ops.write_msr = vmi_wrmsr */ | |
748 | para_fill(read_tsc, RDTSC); | |
749 | /* paravirt_ops.rdpmc = vmi_rdpmc */ | |
750 | ||
751 | /* TR interface doesn't pass TR value */ | |
752 | reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetTR); | |
753 | if (rel->type != VMI_RELOCATION_NONE) { | |
754 | BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); | |
755 | vmi_ops.set_tr = (void *)rel->eip; | |
756 | paravirt_ops.load_tr_desc = vmi_set_tr; | |
757 | } | |
758 | ||
759 | /* LDT is special, too */ | |
760 | reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetLDT); | |
761 | if (rel->type != VMI_RELOCATION_NONE) { | |
762 | BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); | |
763 | vmi_ops._set_ldt = (void *)rel->eip; | |
764 | paravirt_ops.set_ldt = vmi_set_ldt; | |
765 | } | |
766 | ||
767 | para_fill(load_gdt, SetGDT); | |
768 | para_fill(load_idt, SetIDT); | |
769 | para_fill(store_gdt, GetGDT); | |
770 | para_fill(store_idt, GetIDT); | |
771 | para_fill(store_tr, GetTR); | |
772 | paravirt_ops.load_tls = vmi_load_tls; | |
773 | para_fill(write_ldt_entry, WriteLDTEntry); | |
774 | para_fill(write_gdt_entry, WriteGDTEntry); | |
775 | para_fill(write_idt_entry, WriteIDTEntry); | |
776 | reloc = call_vrom_long_func(vmi_rom, get_reloc, | |
777 | VMI_CALL_UpdateKernelStack); | |
778 | if (rel->type != VMI_RELOCATION_NONE) { | |
779 | BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); | |
780 | vmi_ops.set_kernel_stack = (void *)rel->eip; | |
781 | paravirt_ops.load_esp0 = vmi_load_esp0; | |
782 | } | |
783 | ||
784 | para_fill(set_iopl_mask, SetIOPLMask); | |
785 | paravirt_ops.io_delay = (void *)vmi_nop; | |
786 | if (!disable_nodelay) { | |
787 | paravirt_ops.const_udelay = (void *)vmi_nop; | |
788 | } | |
789 | ||
790 | para_fill(set_lazy_mode, SetLazyMode); | |
791 | ||
792 | reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_FlushTLB); | |
793 | if (rel->type != VMI_RELOCATION_NONE) { | |
794 | vmi_ops.flush_tlb = (void *)rel->eip; | |
795 | paravirt_ops.flush_tlb_user = vmi_flush_tlb_user; | |
796 | paravirt_ops.flush_tlb_kernel = vmi_flush_tlb_kernel; | |
797 | } | |
798 | para_fill(flush_tlb_single, InvalPage); | |
799 | ||
800 | /* | |
801 | * Until a standard flag format can be agreed on, we need to | |
802 | * implement these as wrappers in Linux. Get the VMI ROM | |
803 | * function pointers for the two backend calls. | |
804 | */ | |
805 | #ifdef CONFIG_X86_PAE | |
806 | vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxELong); | |
807 | vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxELong); | |
808 | #else | |
809 | vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxE); | |
810 | vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxE); | |
811 | #endif | |
812 | vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping); | |
813 | vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage); | |
814 | vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage); | |
815 | ||
816 | paravirt_ops.alloc_pt = vmi_allocate_pt; | |
817 | paravirt_ops.alloc_pd = vmi_allocate_pd; | |
818 | paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone; | |
819 | paravirt_ops.release_pt = vmi_release_pt; | |
820 | paravirt_ops.release_pd = vmi_release_pd; | |
821 | paravirt_ops.set_pte = vmi_set_pte; | |
822 | paravirt_ops.set_pte_at = vmi_set_pte_at; | |
823 | paravirt_ops.set_pmd = vmi_set_pmd; | |
824 | paravirt_ops.pte_update = vmi_update_pte; | |
825 | paravirt_ops.pte_update_defer = vmi_update_pte_defer; | |
826 | #ifdef CONFIG_X86_PAE | |
827 | paravirt_ops.set_pte_atomic = vmi_set_pte_atomic; | |
828 | paravirt_ops.set_pte_present = vmi_set_pte_present; | |
829 | paravirt_ops.set_pud = vmi_set_pud; | |
830 | paravirt_ops.pte_clear = vmi_pte_clear; | |
831 | paravirt_ops.pmd_clear = vmi_pmd_clear; | |
832 | #endif | |
833 | /* | |
834 | * These MUST always be patched. Don't support indirect jumps | |
835 | * through these operations, as the VMI interface may use either | |
836 | * a jump or a call to get to these operations, depending on | |
837 | * the backend. They are performance critical anyway, so requiring | |
838 | * a patch is not a big problem. | |
839 | */ | |
840 | paravirt_ops.irq_enable_sysexit = (void *)0xfeedbab0; | |
841 | paravirt_ops.iret = (void *)0xbadbab0; | |
842 | ||
843 | #ifdef CONFIG_SMP | |
844 | paravirt_ops.startup_ipi_hook = vmi_startup_ipi_hook; | |
845 | vmi_ops.set_initial_ap_state = vmi_get_function(VMI_CALL_SetInitialAPState); | |
846 | #endif | |
847 | ||
848 | #ifdef CONFIG_X86_LOCAL_APIC | |
849 | paravirt_ops.apic_read = vmi_get_function(VMI_CALL_APICRead); | |
850 | paravirt_ops.apic_write = vmi_get_function(VMI_CALL_APICWrite); | |
851 | paravirt_ops.apic_write_atomic = vmi_get_function(VMI_CALL_APICWrite); | |
852 | #endif | |
853 | ||
bbab4f3b ZA |
854 | /* |
855 | * Check for VMI timer functionality by probing for a cycle frequency method | |
856 | */ | |
857 | reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_GetCycleFrequency); | |
858 | if (rel->type != VMI_RELOCATION_NONE) { | |
859 | vmi_timer_ops.get_cycle_frequency = (void *)rel->eip; | |
860 | vmi_timer_ops.get_cycle_counter = | |
861 | vmi_get_function(VMI_CALL_GetCycleCounter); | |
862 | vmi_timer_ops.get_wallclock = | |
863 | vmi_get_function(VMI_CALL_GetWallclockTime); | |
864 | vmi_timer_ops.wallclock_updated = | |
865 | vmi_get_function(VMI_CALL_WallclockUpdated); | |
866 | vmi_timer_ops.set_alarm = vmi_get_function(VMI_CALL_SetAlarm); | |
867 | vmi_timer_ops.cancel_alarm = | |
868 | vmi_get_function(VMI_CALL_CancelAlarm); | |
869 | paravirt_ops.time_init = vmi_time_init; | |
870 | paravirt_ops.get_wallclock = vmi_get_wallclock; | |
871 | paravirt_ops.set_wallclock = vmi_set_wallclock; | |
872 | #ifdef CONFIG_X86_LOCAL_APIC | |
873 | paravirt_ops.setup_boot_clock = vmi_timer_setup_boot_alarm; | |
874 | paravirt_ops.setup_secondary_clock = vmi_timer_setup_secondary_alarm; | |
875 | #endif | |
6cb9a835 | 876 | paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles; |
1182d852 | 877 | paravirt_ops.get_cpu_khz = vmi_cpu_khz; |
bbab4f3b | 878 | } |
7507ba34 ZA |
879 | if (!disable_noidle) |
880 | para_fill(safe_halt, Halt); | |
881 | else { | |
882 | vmi_ops.halt = vmi_get_function(VMI_CALL_Halt); | |
883 | paravirt_ops.safe_halt = vmi_safe_halt; | |
884 | } | |
bbab4f3b | 885 | |
7ce0bcfd ZA |
886 | /* |
887 | * Alternative instruction rewriting doesn't happen soon enough | |
888 | * to convert VMI_IRET to a call instead of a jump; so we have | |
889 | * to do this before IRQs get reenabled. Fortunately, it is | |
890 | * idempotent. | |
891 | */ | |
892 | apply_paravirt(__start_parainstructions, __stop_parainstructions); | |
893 | ||
894 | vmi_bringup(); | |
895 | ||
896 | return 1; | |
897 | } | |
898 | ||
899 | #undef para_fill | |
900 | ||
901 | void __init vmi_init(void) | |
902 | { | |
903 | unsigned long flags; | |
904 | ||
905 | if (!vmi_rom) | |
906 | probe_vmi_rom(); | |
907 | else | |
908 | check_vmi_rom(vmi_rom); | |
909 | ||
910 | /* In case probing for or validating the ROM failed, basil */ | |
911 | if (!vmi_rom) | |
912 | return; | |
913 | ||
914 | reserve_top_address(-vmi_rom->virtual_top); | |
915 | ||
916 | local_irq_save(flags); | |
917 | activate_vmi(); | |
7507ba34 ZA |
918 | |
919 | #ifdef CONFIG_X86_IO_APIC | |
7ce0bcfd ZA |
920 | no_timer_check = 1; |
921 | #endif | |
7507ba34 | 922 | |
7ce0bcfd ZA |
923 | local_irq_restore(flags & X86_EFLAGS_IF); |
924 | } | |
925 | ||
926 | static int __init parse_vmi(char *arg) | |
927 | { | |
928 | if (!arg) | |
929 | return -EINVAL; | |
930 | ||
931 | if (!strcmp(arg, "disable_nodelay")) | |
932 | disable_nodelay = 1; | |
933 | else if (!strcmp(arg, "disable_pge")) { | |
934 | clear_bit(X86_FEATURE_PGE, boot_cpu_data.x86_capability); | |
935 | disable_pge = 1; | |
936 | } else if (!strcmp(arg, "disable_pse")) { | |
937 | clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability); | |
938 | disable_pse = 1; | |
939 | } else if (!strcmp(arg, "disable_sep")) { | |
940 | clear_bit(X86_FEATURE_SEP, boot_cpu_data.x86_capability); | |
941 | disable_sep = 1; | |
942 | } else if (!strcmp(arg, "disable_tsc")) { | |
943 | clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability); | |
944 | disable_tsc = 1; | |
945 | } else if (!strcmp(arg, "disable_mtrr")) { | |
946 | clear_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability); | |
947 | disable_mtrr = 1; | |
7507ba34 ZA |
948 | } else if (!strcmp(arg, "disable_noidle")) |
949 | disable_noidle = 1; | |
7ce0bcfd ZA |
950 | return 0; |
951 | } | |
952 | ||
953 | early_param("vmi", parse_vmi); |