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-rw-r--r--arch/x86/include/asm/paravirt.h712
-rw-r--r--arch/x86/include/asm/paravirt_types.h721
2 files changed, 722 insertions, 711 deletions
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 11574934a994..40d6586af25b 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -7,690 +7,11 @@
7#include <asm/pgtable_types.h> 7#include <asm/pgtable_types.h>
8#include <asm/asm.h> 8#include <asm/asm.h>
9 9
10/* Bitmask of what can be clobbered: usually at least eax. */ 10#include <asm/paravirt_types.h>
11#define CLBR_NONE 0
12#define CLBR_EAX (1 << 0)
13#define CLBR_ECX (1 << 1)
14#define CLBR_EDX (1 << 2)
15#define CLBR_EDI (1 << 3)
16
17#ifdef CONFIG_X86_32
18/* CLBR_ANY should match all regs platform has. For i386, that's just it */
19#define CLBR_ANY ((1 << 4) - 1)
20
21#define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
22#define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
23#define CLBR_SCRATCH (0)
24#else
25#define CLBR_RAX CLBR_EAX
26#define CLBR_RCX CLBR_ECX
27#define CLBR_RDX CLBR_EDX
28#define CLBR_RDI CLBR_EDI
29#define CLBR_RSI (1 << 4)
30#define CLBR_R8 (1 << 5)
31#define CLBR_R9 (1 << 6)
32#define CLBR_R10 (1 << 7)
33#define CLBR_R11 (1 << 8)
34
35#define CLBR_ANY ((1 << 9) - 1)
36
37#define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
38 CLBR_RCX | CLBR_R8 | CLBR_R9)
39#define CLBR_RET_REG (CLBR_RAX)
40#define CLBR_SCRATCH (CLBR_R10 | CLBR_R11)
41
42#include <asm/desc_defs.h>
43#endif /* X86_64 */
44
45#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
46 11
47#ifndef __ASSEMBLY__ 12#ifndef __ASSEMBLY__
48#include <linux/types.h> 13#include <linux/types.h>
49#include <linux/cpumask.h> 14#include <linux/cpumask.h>
50#include <asm/kmap_types.h>
51#include <asm/desc_defs.h>
52
53struct page;
54struct thread_struct;
55struct desc_ptr;
56struct tss_struct;
57struct mm_struct;
58struct desc_struct;
59struct task_struct;
60
61/*
62 * Wrapper type for pointers to code which uses the non-standard
63 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
64 */
65struct paravirt_callee_save {
66 void *func;
67};
68
69/* general info */
70struct pv_info {
71 unsigned int kernel_rpl;
72 int shared_kernel_pmd;
73 int paravirt_enabled;
74 const char *name;
75};
76
77struct pv_init_ops {
78 /*
79 * Patch may replace one of the defined code sequences with
80 * arbitrary code, subject to the same register constraints.
81 * This generally means the code is not free to clobber any
82 * registers other than EAX. The patch function should return
83 * the number of bytes of code generated, as we nop pad the
84 * rest in generic code.
85 */
86 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
87 unsigned long addr, unsigned len);
88
89 /* Basic arch-specific setup */
90 void (*arch_setup)(void);
91 char *(*memory_setup)(void);
92 void (*post_allocator_init)(void);
93
94 /* Print a banner to identify the environment */
95 void (*banner)(void);
96};
97
98
99struct pv_lazy_ops {
100 /* Set deferred update mode, used for batching operations. */
101 void (*enter)(void);
102 void (*leave)(void);
103};
104
105struct pv_time_ops {
106 void (*time_init)(void);
107
108 /* Set and set time of day */
109 unsigned long (*get_wallclock)(void);
110 int (*set_wallclock)(unsigned long);
111
112 unsigned long long (*sched_clock)(void);
113 unsigned long (*get_tsc_khz)(void);
114};
115
116struct pv_cpu_ops {
117 /* hooks for various privileged instructions */
118 unsigned long (*get_debugreg)(int regno);
119 void (*set_debugreg)(int regno, unsigned long value);
120
121 void (*clts)(void);
122
123 unsigned long (*read_cr0)(void);
124 void (*write_cr0)(unsigned long);
125
126 unsigned long (*read_cr4_safe)(void);
127 unsigned long (*read_cr4)(void);
128 void (*write_cr4)(unsigned long);
129
130#ifdef CONFIG_X86_64
131 unsigned long (*read_cr8)(void);
132 void (*write_cr8)(unsigned long);
133#endif
134
135 /* Segment descriptor handling */
136 void (*load_tr_desc)(void);
137 void (*load_gdt)(const struct desc_ptr *);
138 void (*load_idt)(const struct desc_ptr *);
139 void (*store_gdt)(struct desc_ptr *);
140 void (*store_idt)(struct desc_ptr *);
141 void (*set_ldt)(const void *desc, unsigned entries);
142 unsigned long (*store_tr)(void);
143 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
144#ifdef CONFIG_X86_64
145 void (*load_gs_index)(unsigned int idx);
146#endif
147 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
148 const void *desc);
149 void (*write_gdt_entry)(struct desc_struct *,
150 int entrynum, const void *desc, int size);
151 void (*write_idt_entry)(gate_desc *,
152 int entrynum, const gate_desc *gate);
153 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
154 void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
155
156 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
157
158 void (*set_iopl_mask)(unsigned mask);
159
160 void (*wbinvd)(void);
161 void (*io_delay)(void);
162
163 /* cpuid emulation, mostly so that caps bits can be disabled */
164 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
165 unsigned int *ecx, unsigned int *edx);
166
167 /* MSR, PMC and TSR operations.
168 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
169 u64 (*read_msr)(unsigned int msr, int *err);
170 int (*rdmsr_regs)(u32 *regs);
171 int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
172 int (*wrmsr_regs)(u32 *regs);
173
174 u64 (*read_tsc)(void);
175 u64 (*read_pmc)(int counter);
176 unsigned long long (*read_tscp)(unsigned int *aux);
177
178 /*
179 * Atomically enable interrupts and return to userspace. This
180 * is only ever used to return to 32-bit processes; in a
181 * 64-bit kernel, it's used for 32-on-64 compat processes, but
182 * never native 64-bit processes. (Jump, not call.)
183 */
184 void (*irq_enable_sysexit)(void);
185
186 /*
187 * Switch to usermode gs and return to 64-bit usermode using
188 * sysret. Only used in 64-bit kernels to return to 64-bit
189 * processes. Usermode register state, including %rsp, must
190 * already be restored.
191 */
192 void (*usergs_sysret64)(void);
193
194 /*
195 * Switch to usermode gs and return to 32-bit usermode using
196 * sysret. Used to return to 32-on-64 compat processes.
197 * Other usermode register state, including %esp, must already
198 * be restored.
199 */
200 void (*usergs_sysret32)(void);
201
202 /* Normal iret. Jump to this with the standard iret stack
203 frame set up. */
204 void (*iret)(void);
205
206 void (*swapgs)(void);
207
208 void (*start_context_switch)(struct task_struct *prev);
209 void (*end_context_switch)(struct task_struct *next);
210};
211
212struct pv_irq_ops {
213 void (*init_IRQ)(void);
214
215 /*
216 * Get/set interrupt state. save_fl and restore_fl are only
217 * expected to use X86_EFLAGS_IF; all other bits
218 * returned from save_fl are undefined, and may be ignored by
219 * restore_fl.
220 *
221 * NOTE: These functions callers expect the callee to preserve
222 * more registers than the standard C calling convention.
223 */
224 struct paravirt_callee_save save_fl;
225 struct paravirt_callee_save restore_fl;
226 struct paravirt_callee_save irq_disable;
227 struct paravirt_callee_save irq_enable;
228
229 void (*safe_halt)(void);
230 void (*halt)(void);
231
232#ifdef CONFIG_X86_64
233 void (*adjust_exception_frame)(void);
234#endif
235};
236
237struct pv_apic_ops {
238#ifdef CONFIG_X86_LOCAL_APIC
239 void (*setup_boot_clock)(void);
240 void (*setup_secondary_clock)(void);
241
242 void (*startup_ipi_hook)(int phys_apicid,
243 unsigned long start_eip,
244 unsigned long start_esp);
245#endif
246};
247
248struct pv_mmu_ops {
249 /*
250 * Called before/after init_mm pagetable setup. setup_start
251 * may reset %cr3, and may pre-install parts of the pagetable;
252 * pagetable setup is expected to preserve any existing
253 * mapping.
254 */
255 void (*pagetable_setup_start)(pgd_t *pgd_base);
256 void (*pagetable_setup_done)(pgd_t *pgd_base);
257
258 unsigned long (*read_cr2)(void);
259 void (*write_cr2)(unsigned long);
260
261 unsigned long (*read_cr3)(void);
262 void (*write_cr3)(unsigned long);
263
264 /*
265 * Hooks for intercepting the creation/use/destruction of an
266 * mm_struct.
267 */
268 void (*activate_mm)(struct mm_struct *prev,
269 struct mm_struct *next);
270 void (*dup_mmap)(struct mm_struct *oldmm,
271 struct mm_struct *mm);
272 void (*exit_mmap)(struct mm_struct *mm);
273
274
275 /* TLB operations */
276 void (*flush_tlb_user)(void);
277 void (*flush_tlb_kernel)(void);
278 void (*flush_tlb_single)(unsigned long addr);
279 void (*flush_tlb_others)(const struct cpumask *cpus,
280 struct mm_struct *mm,
281 unsigned long va);
282
283 /* Hooks for allocating and freeing a pagetable top-level */
284 int (*pgd_alloc)(struct mm_struct *mm);
285 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
286
287 /*
288 * Hooks for allocating/releasing pagetable pages when they're
289 * attached to a pagetable
290 */
291 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
292 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
293 void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
294 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
295 void (*release_pte)(unsigned long pfn);
296 void (*release_pmd)(unsigned long pfn);
297 void (*release_pud)(unsigned long pfn);
298
299 /* Pagetable manipulation functions */
300 void (*set_pte)(pte_t *ptep, pte_t pteval);
301 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
302 pte_t *ptep, pte_t pteval);
303 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
304 void (*pte_update)(struct mm_struct *mm, unsigned long addr,
305 pte_t *ptep);
306 void (*pte_update_defer)(struct mm_struct *mm,
307 unsigned long addr, pte_t *ptep);
308
309 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
310 pte_t *ptep);
311 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
312 pte_t *ptep, pte_t pte);
313
314 struct paravirt_callee_save pte_val;
315 struct paravirt_callee_save make_pte;
316
317 struct paravirt_callee_save pgd_val;
318 struct paravirt_callee_save make_pgd;
319
320#if PAGETABLE_LEVELS >= 3
321#ifdef CONFIG_X86_PAE
322 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
323 void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
324 pte_t *ptep);
325 void (*pmd_clear)(pmd_t *pmdp);
326
327#endif /* CONFIG_X86_PAE */
328
329 void (*set_pud)(pud_t *pudp, pud_t pudval);
330
331 struct paravirt_callee_save pmd_val;
332 struct paravirt_callee_save make_pmd;
333
334#if PAGETABLE_LEVELS == 4
335 struct paravirt_callee_save pud_val;
336 struct paravirt_callee_save make_pud;
337
338 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
339#endif /* PAGETABLE_LEVELS == 4 */
340#endif /* PAGETABLE_LEVELS >= 3 */
341
342#ifdef CONFIG_HIGHPTE
343 void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
344#endif
345
346 struct pv_lazy_ops lazy_mode;
347
348 /* dom0 ops */
349
350 /* Sometimes the physical address is a pfn, and sometimes its
351 an mfn. We can tell which is which from the index. */
352 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
353 phys_addr_t phys, pgprot_t flags);
354};
355
356struct raw_spinlock;
357struct pv_lock_ops {
358 int (*spin_is_locked)(struct raw_spinlock *lock);
359 int (*spin_is_contended)(struct raw_spinlock *lock);
360 void (*spin_lock)(struct raw_spinlock *lock);
361 void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
362 int (*spin_trylock)(struct raw_spinlock *lock);
363 void (*spin_unlock)(struct raw_spinlock *lock);
364};
365
366/* This contains all the paravirt structures: we get a convenient
367 * number for each function using the offset which we use to indicate
368 * what to patch. */
369struct paravirt_patch_template {
370 struct pv_init_ops pv_init_ops;
371 struct pv_time_ops pv_time_ops;
372 struct pv_cpu_ops pv_cpu_ops;
373 struct pv_irq_ops pv_irq_ops;
374 struct pv_apic_ops pv_apic_ops;
375 struct pv_mmu_ops pv_mmu_ops;
376 struct pv_lock_ops pv_lock_ops;
377};
378
379extern struct pv_info pv_info;
380extern struct pv_init_ops pv_init_ops;
381extern struct pv_time_ops pv_time_ops;
382extern struct pv_cpu_ops pv_cpu_ops;
383extern struct pv_irq_ops pv_irq_ops;
384extern struct pv_apic_ops pv_apic_ops;
385extern struct pv_mmu_ops pv_mmu_ops;
386extern struct pv_lock_ops pv_lock_ops;
387
388#define PARAVIRT_PATCH(x) \
389 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
390
391#define paravirt_type(op) \
392 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
393 [paravirt_opptr] "i" (&(op))
394#define paravirt_clobber(clobber) \
395 [paravirt_clobber] "i" (clobber)
396
397/*
398 * Generate some code, and mark it as patchable by the
399 * apply_paravirt() alternate instruction patcher.
400 */
401#define _paravirt_alt(insn_string, type, clobber) \
402 "771:\n\t" insn_string "\n" "772:\n" \
403 ".pushsection .parainstructions,\"a\"\n" \
404 _ASM_ALIGN "\n" \
405 _ASM_PTR " 771b\n" \
406 " .byte " type "\n" \
407 " .byte 772b-771b\n" \
408 " .short " clobber "\n" \
409 ".popsection\n"
410
411/* Generate patchable code, with the default asm parameters. */
412#define paravirt_alt(insn_string) \
413 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
414
415/* Simple instruction patching code. */
416#define DEF_NATIVE(ops, name, code) \
417 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
418 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
419
420unsigned paravirt_patch_nop(void);
421unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
422unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
423unsigned paravirt_patch_ignore(unsigned len);
424unsigned paravirt_patch_call(void *insnbuf,
425 const void *target, u16 tgt_clobbers,
426 unsigned long addr, u16 site_clobbers,
427 unsigned len);
428unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
429 unsigned long addr, unsigned len);
430unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
431 unsigned long addr, unsigned len);
432
433unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
434 const char *start, const char *end);
435
436unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
437 unsigned long addr, unsigned len);
438
439int paravirt_disable_iospace(void);
440
441/*
442 * This generates an indirect call based on the operation type number.
443 * The type number, computed in PARAVIRT_PATCH, is derived from the
444 * offset into the paravirt_patch_template structure, and can therefore be
445 * freely converted back into a structure offset.
446 */
447#define PARAVIRT_CALL "call *%c[paravirt_opptr];"
448
449/*
450 * These macros are intended to wrap calls through one of the paravirt
451 * ops structs, so that they can be later identified and patched at
452 * runtime.
453 *
454 * Normally, a call to a pv_op function is a simple indirect call:
455 * (pv_op_struct.operations)(args...).
456 *
457 * Unfortunately, this is a relatively slow operation for modern CPUs,
458 * because it cannot necessarily determine what the destination
459 * address is. In this case, the address is a runtime constant, so at
460 * the very least we can patch the call to e a simple direct call, or
461 * ideally, patch an inline implementation into the callsite. (Direct
462 * calls are essentially free, because the call and return addresses
463 * are completely predictable.)
464 *
465 * For i386, these macros rely on the standard gcc "regparm(3)" calling
466 * convention, in which the first three arguments are placed in %eax,
467 * %edx, %ecx (in that order), and the remaining arguments are placed
468 * on the stack. All caller-save registers (eax,edx,ecx) are expected
469 * to be modified (either clobbered or used for return values).
470 * X86_64, on the other hand, already specifies a register-based calling
471 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
472 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
473 * special handling for dealing with 4 arguments, unlike i386.
474 * However, x86_64 also have to clobber all caller saved registers, which
475 * unfortunately, are quite a bit (r8 - r11)
476 *
477 * The call instruction itself is marked by placing its start address
478 * and size into the .parainstructions section, so that
479 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
480 * appropriate patching under the control of the backend pv_init_ops
481 * implementation.
482 *
483 * Unfortunately there's no way to get gcc to generate the args setup
484 * for the call, and then allow the call itself to be generated by an
485 * inline asm. Because of this, we must do the complete arg setup and
486 * return value handling from within these macros. This is fairly
487 * cumbersome.
488 *
489 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
490 * It could be extended to more arguments, but there would be little
491 * to be gained from that. For each number of arguments, there are
492 * the two VCALL and CALL variants for void and non-void functions.
493 *
494 * When there is a return value, the invoker of the macro must specify
495 * the return type. The macro then uses sizeof() on that type to
496 * determine whether its a 32 or 64 bit value, and places the return
497 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
498 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
499 * the return value size.
500 *
501 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
502 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
503 * in low,high order
504 *
505 * Small structures are passed and returned in registers. The macro
506 * calling convention can't directly deal with this, so the wrapper
507 * functions must do this.
508 *
509 * These PVOP_* macros are only defined within this header. This
510 * means that all uses must be wrapped in inline functions. This also
511 * makes sure the incoming and outgoing types are always correct.
512 */
513#ifdef CONFIG_X86_32
514#define PVOP_VCALL_ARGS \
515 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
516#define PVOP_CALL_ARGS PVOP_VCALL_ARGS
517
518#define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
519#define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
520#define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
521
522#define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
523 "=c" (__ecx)
524#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
525
526#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
527#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
528
529#define EXTRA_CLOBBERS
530#define VEXTRA_CLOBBERS
531#else /* CONFIG_X86_64 */
532#define PVOP_VCALL_ARGS \
533 unsigned long __edi = __edi, __esi = __esi, \
534 __edx = __edx, __ecx = __ecx
535#define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
536
537#define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
538#define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
539#define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
540#define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
541
542#define PVOP_VCALL_CLOBBERS "=D" (__edi), \
543 "=S" (__esi), "=d" (__edx), \
544 "=c" (__ecx)
545#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
546
547#define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
548#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
549
550#define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
551#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
552#endif /* CONFIG_X86_32 */
553
554#ifdef CONFIG_PARAVIRT_DEBUG
555#define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
556#else
557#define PVOP_TEST_NULL(op) ((void)op)
558#endif
559
560#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
561 pre, post, ...) \
562 ({ \
563 rettype __ret; \
564 PVOP_CALL_ARGS; \
565 PVOP_TEST_NULL(op); \
566 /* This is 32-bit specific, but is okay in 64-bit */ \
567 /* since this condition will never hold */ \
568 if (sizeof(rettype) > sizeof(unsigned long)) { \
569 asm volatile(pre \
570 paravirt_alt(PARAVIRT_CALL) \
571 post \
572 : call_clbr \
573 : paravirt_type(op), \
574 paravirt_clobber(clbr), \
575 ##__VA_ARGS__ \
576 : "memory", "cc" extra_clbr); \
577 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
578 } else { \
579 asm volatile(pre \
580 paravirt_alt(PARAVIRT_CALL) \
581 post \
582 : call_clbr \
583 : paravirt_type(op), \
584 paravirt_clobber(clbr), \
585 ##__VA_ARGS__ \
586 : "memory", "cc" extra_clbr); \
587 __ret = (rettype)__eax; \
588 } \
589 __ret; \
590 })
591
592#define __PVOP_CALL(rettype, op, pre, post, ...) \
593 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
594 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
595
596#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
597 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
598 PVOP_CALLEE_CLOBBERS, , \
599 pre, post, ##__VA_ARGS__)
600
601
602#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
603 ({ \
604 PVOP_VCALL_ARGS; \
605 PVOP_TEST_NULL(op); \
606 asm volatile(pre \
607 paravirt_alt(PARAVIRT_CALL) \
608 post \
609 : call_clbr \
610 : paravirt_type(op), \
611 paravirt_clobber(clbr), \
612 ##__VA_ARGS__ \
613 : "memory", "cc" extra_clbr); \
614 })
615
616#define __PVOP_VCALL(op, pre, post, ...) \
617 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
618 VEXTRA_CLOBBERS, \
619 pre, post, ##__VA_ARGS__)
620
621#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...) \
622 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
623 PVOP_VCALLEE_CLOBBERS, , \
624 pre, post, ##__VA_ARGS__)
625
626
627
628#define PVOP_CALL0(rettype, op) \
629 __PVOP_CALL(rettype, op, "", "")
630#define PVOP_VCALL0(op) \
631 __PVOP_VCALL(op, "", "")
632
633#define PVOP_CALLEE0(rettype, op) \
634 __PVOP_CALLEESAVE(rettype, op, "", "")
635#define PVOP_VCALLEE0(op) \
636 __PVOP_VCALLEESAVE(op, "", "")
637
638
639#define PVOP_CALL1(rettype, op, arg1) \
640 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
641#define PVOP_VCALL1(op, arg1) \
642 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
643
644#define PVOP_CALLEE1(rettype, op, arg1) \
645 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
646#define PVOP_VCALLEE1(op, arg1) \
647 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
648
649
650#define PVOP_CALL2(rettype, op, arg1, arg2) \
651 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
652 PVOP_CALL_ARG2(arg2))
653#define PVOP_VCALL2(op, arg1, arg2) \
654 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
655 PVOP_CALL_ARG2(arg2))
656
657#define PVOP_CALLEE2(rettype, op, arg1, arg2) \
658 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
659 PVOP_CALL_ARG2(arg2))
660#define PVOP_VCALLEE2(op, arg1, arg2) \
661 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
662 PVOP_CALL_ARG2(arg2))
663
664
665#define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
666 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
667 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
668#define PVOP_VCALL3(op, arg1, arg2, arg3) \
669 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
670 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
671
672/* This is the only difference in x86_64. We can make it much simpler */
673#ifdef CONFIG_X86_32
674#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
675 __PVOP_CALL(rettype, op, \
676 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
677 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
678 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
679#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
680 __PVOP_VCALL(op, \
681 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
682 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
683 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
684#else
685#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
686 __PVOP_CALL(rettype, op, "", "", \
687 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
688 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
689#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
690 __PVOP_VCALL(op, "", "", \
691 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
692 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
693#endif
694 15
695static inline int paravirt_enabled(void) 16static inline int paravirt_enabled(void)
696{ 17{
@@ -1423,20 +744,6 @@ static inline void pmd_clear(pmd_t *pmdp)
1423} 744}
1424#endif /* CONFIG_X86_PAE */ 745#endif /* CONFIG_X86_PAE */
1425 746
1426/* Lazy mode for batching updates / context switch */
1427enum paravirt_lazy_mode {
1428 PARAVIRT_LAZY_NONE,
1429 PARAVIRT_LAZY_MMU,
1430 PARAVIRT_LAZY_CPU,
1431};
1432
1433enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
1434void paravirt_start_context_switch(struct task_struct *prev);
1435void paravirt_end_context_switch(struct task_struct *next);
1436
1437void paravirt_enter_lazy_mmu(void);
1438void paravirt_leave_lazy_mmu(void);
1439
1440#define __HAVE_ARCH_START_CONTEXT_SWITCH 747#define __HAVE_ARCH_START_CONTEXT_SWITCH
1441static inline void arch_start_context_switch(struct task_struct *prev) 748static inline void arch_start_context_switch(struct task_struct *prev)
1442{ 749{
@@ -1467,12 +774,6 @@ static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
1467 pv_mmu_ops.set_fixmap(idx, phys, flags); 774 pv_mmu_ops.set_fixmap(idx, phys, flags);
1468} 775}
1469 776
1470void _paravirt_nop(void);
1471u32 _paravirt_ident_32(u32);
1472u64 _paravirt_ident_64(u64);
1473
1474#define paravirt_nop ((void *)_paravirt_nop)
1475
1476#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS) 777#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
1477 778
1478static inline int __raw_spin_is_locked(struct raw_spinlock *lock) 779static inline int __raw_spin_is_locked(struct raw_spinlock *lock)
@@ -1509,17 +810,6 @@ static __always_inline void __raw_spin_unlock(struct raw_spinlock *lock)
1509 810
1510#endif 811#endif
1511 812
1512/* These all sit in the .parainstructions section to tell us what to patch. */
1513struct paravirt_patch_site {
1514 u8 *instr; /* original instructions */
1515 u8 instrtype; /* type of this instruction */
1516 u8 len; /* length of original instruction */
1517 u16 clobbers; /* what registers you may clobber */
1518};
1519
1520extern struct paravirt_patch_site __parainstructions[],
1521 __parainstructions_end[];
1522
1523#ifdef CONFIG_X86_32 813#ifdef CONFIG_X86_32
1524#define PV_SAVE_REGS "pushl %ecx; pushl %edx;" 814#define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
1525#define PV_RESTORE_REGS "popl %edx; popl %ecx;" 815#define PV_RESTORE_REGS "popl %edx; popl %ecx;"
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
new file mode 100644
index 000000000000..25402d0006e7
--- /dev/null
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -0,0 +1,721 @@
1#ifndef _ASM_X86_PARAVIRT_TYPES_H
2#define _ASM_X86_PARAVIRT_TYPES_H
3
4/* Bitmask of what can be clobbered: usually at least eax. */
5#define CLBR_NONE 0
6#define CLBR_EAX (1 << 0)
7#define CLBR_ECX (1 << 1)
8#define CLBR_EDX (1 << 2)
9#define CLBR_EDI (1 << 3)
10
11#ifdef CONFIG_X86_32
12/* CLBR_ANY should match all regs platform has. For i386, that's just it */
13#define CLBR_ANY ((1 << 4) - 1)
14
15#define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
16#define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
17#define CLBR_SCRATCH (0)
18#else
19#define CLBR_RAX CLBR_EAX
20#define CLBR_RCX CLBR_ECX
21#define CLBR_RDX CLBR_EDX
22#define CLBR_RDI CLBR_EDI
23#define CLBR_RSI (1 << 4)
24#define CLBR_R8 (1 << 5)
25#define CLBR_R9 (1 << 6)
26#define CLBR_R10 (1 << 7)
27#define CLBR_R11 (1 << 8)
28
29#define CLBR_ANY ((1 << 9) - 1)
30
31#define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
32 CLBR_RCX | CLBR_R8 | CLBR_R9)
33#define CLBR_RET_REG (CLBR_RAX)
34#define CLBR_SCRATCH (CLBR_R10 | CLBR_R11)
35
36#endif /* X86_64 */
37
38#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
39
40#ifndef __ASSEMBLY__
41
42#include <asm/desc_defs.h>
43#include <asm/kmap_types.h>
44
45struct page;
46struct thread_struct;
47struct desc_ptr;
48struct tss_struct;
49struct mm_struct;
50struct desc_struct;
51struct task_struct;
52struct cpumask;
53
54/*
55 * Wrapper type for pointers to code which uses the non-standard
56 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
57 */
58struct paravirt_callee_save {
59 void *func;
60};
61
62/* general info */
63struct pv_info {
64 unsigned int kernel_rpl;
65 int shared_kernel_pmd;
66 int paravirt_enabled;
67 const char *name;
68};
69
70struct pv_init_ops {
71 /*
72 * Patch may replace one of the defined code sequences with
73 * arbitrary code, subject to the same register constraints.
74 * This generally means the code is not free to clobber any
75 * registers other than EAX. The patch function should return
76 * the number of bytes of code generated, as we nop pad the
77 * rest in generic code.
78 */
79 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
80 unsigned long addr, unsigned len);
81
82 /* Basic arch-specific setup */
83 void (*arch_setup)(void);
84 char *(*memory_setup)(void);
85 void (*post_allocator_init)(void);
86
87 /* Print a banner to identify the environment */
88 void (*banner)(void);
89};
90
91
92struct pv_lazy_ops {
93 /* Set deferred update mode, used for batching operations. */
94 void (*enter)(void);
95 void (*leave)(void);
96};
97
98struct pv_time_ops {
99 void (*time_init)(void);
100
101 /* Set and set time of day */
102 unsigned long (*get_wallclock)(void);
103 int (*set_wallclock)(unsigned long);
104
105 unsigned long long (*sched_clock)(void);
106 unsigned long (*get_tsc_khz)(void);
107};
108
109struct pv_cpu_ops {
110 /* hooks for various privileged instructions */
111 unsigned long (*get_debugreg)(int regno);
112 void (*set_debugreg)(int regno, unsigned long value);
113
114 void (*clts)(void);
115
116 unsigned long (*read_cr0)(void);
117 void (*write_cr0)(unsigned long);
118
119 unsigned long (*read_cr4_safe)(void);
120 unsigned long (*read_cr4)(void);
121 void (*write_cr4)(unsigned long);
122
123#ifdef CONFIG_X86_64
124 unsigned long (*read_cr8)(void);
125 void (*write_cr8)(unsigned long);
126#endif
127
128 /* Segment descriptor handling */
129 void (*load_tr_desc)(void);
130 void (*load_gdt)(const struct desc_ptr *);
131 void (*load_idt)(const struct desc_ptr *);
132 void (*store_gdt)(struct desc_ptr *);
133 void (*store_idt)(struct desc_ptr *);
134 void (*set_ldt)(const void *desc, unsigned entries);
135 unsigned long (*store_tr)(void);
136 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
137#ifdef CONFIG_X86_64
138 void (*load_gs_index)(unsigned int idx);
139#endif
140 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
141 const void *desc);
142 void (*write_gdt_entry)(struct desc_struct *,
143 int entrynum, const void *desc, int size);
144 void (*write_idt_entry)(gate_desc *,
145 int entrynum, const gate_desc *gate);
146 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
147 void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
148
149 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
150
151 void (*set_iopl_mask)(unsigned mask);
152
153 void (*wbinvd)(void);
154 void (*io_delay)(void);
155
156 /* cpuid emulation, mostly so that caps bits can be disabled */
157 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
158 unsigned int *ecx, unsigned int *edx);
159
160 /* MSR, PMC and TSR operations.
161 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
162 u64 (*read_msr)(unsigned int msr, int *err);
163 int (*rdmsr_regs)(u32 *regs);
164 int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
165 int (*wrmsr_regs)(u32 *regs);
166
167 u64 (*read_tsc)(void);
168 u64 (*read_pmc)(int counter);
169 unsigned long long (*read_tscp)(unsigned int *aux);
170
171 /*
172 * Atomically enable interrupts and return to userspace. This
173 * is only ever used to return to 32-bit processes; in a
174 * 64-bit kernel, it's used for 32-on-64 compat processes, but
175 * never native 64-bit processes. (Jump, not call.)
176 */
177 void (*irq_enable_sysexit)(void);
178
179 /*
180 * Switch to usermode gs and return to 64-bit usermode using
181 * sysret. Only used in 64-bit kernels to return to 64-bit
182 * processes. Usermode register state, including %rsp, must
183 * already be restored.
184 */
185 void (*usergs_sysret64)(void);
186
187 /*
188 * Switch to usermode gs and return to 32-bit usermode using
189 * sysret. Used to return to 32-on-64 compat processes.
190 * Other usermode register state, including %esp, must already
191 * be restored.
192 */
193 void (*usergs_sysret32)(void);
194
195 /* Normal iret. Jump to this with the standard iret stack
196 frame set up. */
197 void (*iret)(void);
198
199 void (*swapgs)(void);
200
201 void (*start_context_switch)(struct task_struct *prev);
202 void (*end_context_switch)(struct task_struct *next);
203};
204
205struct pv_irq_ops {
206 void (*init_IRQ)(void);
207
208 /*
209 * Get/set interrupt state. save_fl and restore_fl are only
210 * expected to use X86_EFLAGS_IF; all other bits
211 * returned from save_fl are undefined, and may be ignored by
212 * restore_fl.
213 *
214 * NOTE: These functions callers expect the callee to preserve
215 * more registers than the standard C calling convention.
216 */
217 struct paravirt_callee_save save_fl;
218 struct paravirt_callee_save restore_fl;
219 struct paravirt_callee_save irq_disable;
220 struct paravirt_callee_save irq_enable;
221
222 void (*safe_halt)(void);
223 void (*halt)(void);
224
225#ifdef CONFIG_X86_64
226 void (*adjust_exception_frame)(void);
227#endif
228};
229
230struct pv_apic_ops {
231#ifdef CONFIG_X86_LOCAL_APIC
232 void (*setup_boot_clock)(void);
233 void (*setup_secondary_clock)(void);
234
235 void (*startup_ipi_hook)(int phys_apicid,
236 unsigned long start_eip,
237 unsigned long start_esp);
238#endif
239};
240
241struct pv_mmu_ops {
242 /*
243 * Called before/after init_mm pagetable setup. setup_start
244 * may reset %cr3, and may pre-install parts of the pagetable;
245 * pagetable setup is expected to preserve any existing
246 * mapping.
247 */
248 void (*pagetable_setup_start)(pgd_t *pgd_base);
249 void (*pagetable_setup_done)(pgd_t *pgd_base);
250
251 unsigned long (*read_cr2)(void);
252 void (*write_cr2)(unsigned long);
253
254 unsigned long (*read_cr3)(void);
255 void (*write_cr3)(unsigned long);
256
257 /*
258 * Hooks for intercepting the creation/use/destruction of an
259 * mm_struct.
260 */
261 void (*activate_mm)(struct mm_struct *prev,
262 struct mm_struct *next);
263 void (*dup_mmap)(struct mm_struct *oldmm,
264 struct mm_struct *mm);
265 void (*exit_mmap)(struct mm_struct *mm);
266
267
268 /* TLB operations */
269 void (*flush_tlb_user)(void);
270 void (*flush_tlb_kernel)(void);
271 void (*flush_tlb_single)(unsigned long addr);
272 void (*flush_tlb_others)(const struct cpumask *cpus,
273 struct mm_struct *mm,
274 unsigned long va);
275
276 /* Hooks for allocating and freeing a pagetable top-level */
277 int (*pgd_alloc)(struct mm_struct *mm);
278 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
279
280 /*
281 * Hooks for allocating/releasing pagetable pages when they're
282 * attached to a pagetable
283 */
284 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
285 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
286 void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
287 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
288 void (*release_pte)(unsigned long pfn);
289 void (*release_pmd)(unsigned long pfn);
290 void (*release_pud)(unsigned long pfn);
291
292 /* Pagetable manipulation functions */
293 void (*set_pte)(pte_t *ptep, pte_t pteval);
294 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
295 pte_t *ptep, pte_t pteval);
296 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
297 void (*pte_update)(struct mm_struct *mm, unsigned long addr,
298 pte_t *ptep);
299 void (*pte_update_defer)(struct mm_struct *mm,
300 unsigned long addr, pte_t *ptep);
301
302 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
303 pte_t *ptep);
304 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
305 pte_t *ptep, pte_t pte);
306
307 struct paravirt_callee_save pte_val;
308 struct paravirt_callee_save make_pte;
309
310 struct paravirt_callee_save pgd_val;
311 struct paravirt_callee_save make_pgd;
312
313#if PAGETABLE_LEVELS >= 3
314#ifdef CONFIG_X86_PAE
315 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
316 void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
317 pte_t *ptep);
318 void (*pmd_clear)(pmd_t *pmdp);
319
320#endif /* CONFIG_X86_PAE */
321
322 void (*set_pud)(pud_t *pudp, pud_t pudval);
323
324 struct paravirt_callee_save pmd_val;
325 struct paravirt_callee_save make_pmd;
326
327#if PAGETABLE_LEVELS == 4
328 struct paravirt_callee_save pud_val;
329 struct paravirt_callee_save make_pud;
330
331 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
332#endif /* PAGETABLE_LEVELS == 4 */
333#endif /* PAGETABLE_LEVELS >= 3 */
334
335#ifdef CONFIG_HIGHPTE
336 void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
337#endif
338
339 struct pv_lazy_ops lazy_mode;
340
341 /* dom0 ops */
342
343 /* Sometimes the physical address is a pfn, and sometimes its
344 an mfn. We can tell which is which from the index. */
345 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
346 phys_addr_t phys, pgprot_t flags);
347};
348
349struct raw_spinlock;
350struct pv_lock_ops {
351 int (*spin_is_locked)(struct raw_spinlock *lock);
352 int (*spin_is_contended)(struct raw_spinlock *lock);
353 void (*spin_lock)(struct raw_spinlock *lock);
354 void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
355 int (*spin_trylock)(struct raw_spinlock *lock);
356 void (*spin_unlock)(struct raw_spinlock *lock);
357};
358
359/* This contains all the paravirt structures: we get a convenient
360 * number for each function using the offset which we use to indicate
361 * what to patch. */
362struct paravirt_patch_template {
363 struct pv_init_ops pv_init_ops;
364 struct pv_time_ops pv_time_ops;
365 struct pv_cpu_ops pv_cpu_ops;
366 struct pv_irq_ops pv_irq_ops;
367 struct pv_apic_ops pv_apic_ops;
368 struct pv_mmu_ops pv_mmu_ops;
369 struct pv_lock_ops pv_lock_ops;
370};
371
372extern struct pv_info pv_info;
373extern struct pv_init_ops pv_init_ops;
374extern struct pv_time_ops pv_time_ops;
375extern struct pv_cpu_ops pv_cpu_ops;
376extern struct pv_irq_ops pv_irq_ops;
377extern struct pv_apic_ops pv_apic_ops;
378extern struct pv_mmu_ops pv_mmu_ops;
379extern struct pv_lock_ops pv_lock_ops;
380
381#define PARAVIRT_PATCH(x) \
382 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
383
384#define paravirt_type(op) \
385 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
386 [paravirt_opptr] "i" (&(op))
387#define paravirt_clobber(clobber) \
388 [paravirt_clobber] "i" (clobber)
389
390/*
391 * Generate some code, and mark it as patchable by the
392 * apply_paravirt() alternate instruction patcher.
393 */
394#define _paravirt_alt(insn_string, type, clobber) \
395 "771:\n\t" insn_string "\n" "772:\n" \
396 ".pushsection .parainstructions,\"a\"\n" \
397 _ASM_ALIGN "\n" \
398 _ASM_PTR " 771b\n" \
399 " .byte " type "\n" \
400 " .byte 772b-771b\n" \
401 " .short " clobber "\n" \
402 ".popsection\n"
403
404/* Generate patchable code, with the default asm parameters. */
405#define paravirt_alt(insn_string) \
406 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
407
408/* Simple instruction patching code. */
409#define DEF_NATIVE(ops, name, code) \
410 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
411 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
412
413unsigned paravirt_patch_nop(void);
414unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
415unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
416unsigned paravirt_patch_ignore(unsigned len);
417unsigned paravirt_patch_call(void *insnbuf,
418 const void *target, u16 tgt_clobbers,
419 unsigned long addr, u16 site_clobbers,
420 unsigned len);
421unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
422 unsigned long addr, unsigned len);
423unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
424 unsigned long addr, unsigned len);
425
426unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
427 const char *start, const char *end);
428
429unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
430 unsigned long addr, unsigned len);
431
432int paravirt_disable_iospace(void);
433
434/*
435 * This generates an indirect call based on the operation type number.
436 * The type number, computed in PARAVIRT_PATCH, is derived from the
437 * offset into the paravirt_patch_template structure, and can therefore be
438 * freely converted back into a structure offset.
439 */
440#define PARAVIRT_CALL "call *%c[paravirt_opptr];"
441
442/*
443 * These macros are intended to wrap calls through one of the paravirt
444 * ops structs, so that they can be later identified and patched at
445 * runtime.
446 *
447 * Normally, a call to a pv_op function is a simple indirect call:
448 * (pv_op_struct.operations)(args...).
449 *
450 * Unfortunately, this is a relatively slow operation for modern CPUs,
451 * because it cannot necessarily determine what the destination
452 * address is. In this case, the address is a runtime constant, so at
453 * the very least we can patch the call to e a simple direct call, or
454 * ideally, patch an inline implementation into the callsite. (Direct
455 * calls are essentially free, because the call and return addresses
456 * are completely predictable.)
457 *
458 * For i386, these macros rely on the standard gcc "regparm(3)" calling
459 * convention, in which the first three arguments are placed in %eax,
460 * %edx, %ecx (in that order), and the remaining arguments are placed
461 * on the stack. All caller-save registers (eax,edx,ecx) are expected
462 * to be modified (either clobbered or used for return values).
463 * X86_64, on the other hand, already specifies a register-based calling
464 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
465 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
466 * special handling for dealing with 4 arguments, unlike i386.
467 * However, x86_64 also have to clobber all caller saved registers, which
468 * unfortunately, are quite a bit (r8 - r11)
469 *
470 * The call instruction itself is marked by placing its start address
471 * and size into the .parainstructions section, so that
472 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
473 * appropriate patching under the control of the backend pv_init_ops
474 * implementation.
475 *
476 * Unfortunately there's no way to get gcc to generate the args setup
477 * for the call, and then allow the call itself to be generated by an
478 * inline asm. Because of this, we must do the complete arg setup and
479 * return value handling from within these macros. This is fairly
480 * cumbersome.
481 *
482 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
483 * It could be extended to more arguments, but there would be little
484 * to be gained from that. For each number of arguments, there are
485 * the two VCALL and CALL variants for void and non-void functions.
486 *
487 * When there is a return value, the invoker of the macro must specify
488 * the return type. The macro then uses sizeof() on that type to
489 * determine whether its a 32 or 64 bit value, and places the return
490 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
491 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
492 * the return value size.
493 *
494 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
495 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
496 * in low,high order
497 *
498 * Small structures are passed and returned in registers. The macro
499 * calling convention can't directly deal with this, so the wrapper
500 * functions must do this.
501 *
502 * These PVOP_* macros are only defined within this header. This
503 * means that all uses must be wrapped in inline functions. This also
504 * makes sure the incoming and outgoing types are always correct.
505 */
506#ifdef CONFIG_X86_32
507#define PVOP_VCALL_ARGS \
508 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
509#define PVOP_CALL_ARGS PVOP_VCALL_ARGS
510
511#define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
512#define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
513#define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
514
515#define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
516 "=c" (__ecx)
517#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
518
519#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
520#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
521
522#define EXTRA_CLOBBERS
523#define VEXTRA_CLOBBERS
524#else /* CONFIG_X86_64 */
525#define PVOP_VCALL_ARGS \
526 unsigned long __edi = __edi, __esi = __esi, \
527 __edx = __edx, __ecx = __ecx
528#define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
529
530#define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
531#define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
532#define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
533#define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
534
535#define PVOP_VCALL_CLOBBERS "=D" (__edi), \
536 "=S" (__esi), "=d" (__edx), \
537 "=c" (__ecx)
538#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
539
540#define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
541#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
542
543#define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
544#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
545#endif /* CONFIG_X86_32 */
546
547#ifdef CONFIG_PARAVIRT_DEBUG
548#define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
549#else
550#define PVOP_TEST_NULL(op) ((void)op)
551#endif
552
553#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
554 pre, post, ...) \
555 ({ \
556 rettype __ret; \
557 PVOP_CALL_ARGS; \
558 PVOP_TEST_NULL(op); \
559 /* This is 32-bit specific, but is okay in 64-bit */ \
560 /* since this condition will never hold */ \
561 if (sizeof(rettype) > sizeof(unsigned long)) { \
562 asm volatile(pre \
563 paravirt_alt(PARAVIRT_CALL) \
564 post \
565 : call_clbr \
566 : paravirt_type(op), \
567 paravirt_clobber(clbr), \
568 ##__VA_ARGS__ \
569 : "memory", "cc" extra_clbr); \
570 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
571 } else { \
572 asm volatile(pre \
573 paravirt_alt(PARAVIRT_CALL) \
574 post \
575 : call_clbr \
576 : paravirt_type(op), \
577 paravirt_clobber(clbr), \
578 ##__VA_ARGS__ \
579 : "memory", "cc" extra_clbr); \
580 __ret = (rettype)__eax; \
581 } \
582 __ret; \
583 })
584
585#define __PVOP_CALL(rettype, op, pre, post, ...) \
586 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
587 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
588
589#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
590 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
591 PVOP_CALLEE_CLOBBERS, , \
592 pre, post, ##__VA_ARGS__)
593
594
595#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
596 ({ \
597 PVOP_VCALL_ARGS; \
598 PVOP_TEST_NULL(op); \
599 asm volatile(pre \
600 paravirt_alt(PARAVIRT_CALL) \
601 post \
602 : call_clbr \
603 : paravirt_type(op), \
604 paravirt_clobber(clbr), \
605 ##__VA_ARGS__ \
606 : "memory", "cc" extra_clbr); \
607 })
608
609#define __PVOP_VCALL(op, pre, post, ...) \
610 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
611 VEXTRA_CLOBBERS, \
612 pre, post, ##__VA_ARGS__)
613
614#define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...) \
615 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
616 PVOP_VCALLEE_CLOBBERS, , \
617 pre, post, ##__VA_ARGS__)
618
619
620
621#define PVOP_CALL0(rettype, op) \
622 __PVOP_CALL(rettype, op, "", "")
623#define PVOP_VCALL0(op) \
624 __PVOP_VCALL(op, "", "")
625
626#define PVOP_CALLEE0(rettype, op) \
627 __PVOP_CALLEESAVE(rettype, op, "", "")
628#define PVOP_VCALLEE0(op) \
629 __PVOP_VCALLEESAVE(op, "", "")
630
631
632#define PVOP_CALL1(rettype, op, arg1) \
633 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
634#define PVOP_VCALL1(op, arg1) \
635 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
636
637#define PVOP_CALLEE1(rettype, op, arg1) \
638 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
639#define PVOP_VCALLEE1(op, arg1) \
640 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
641
642
643#define PVOP_CALL2(rettype, op, arg1, arg2) \
644 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
645 PVOP_CALL_ARG2(arg2))
646#define PVOP_VCALL2(op, arg1, arg2) \
647 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
648 PVOP_CALL_ARG2(arg2))
649
650#define PVOP_CALLEE2(rettype, op, arg1, arg2) \
651 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
652 PVOP_CALL_ARG2(arg2))
653#define PVOP_VCALLEE2(op, arg1, arg2) \
654 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
655 PVOP_CALL_ARG2(arg2))
656
657
658#define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
659 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
660 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
661#define PVOP_VCALL3(op, arg1, arg2, arg3) \
662 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
663 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
664
665/* This is the only difference in x86_64. We can make it much simpler */
666#ifdef CONFIG_X86_32
667#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
668 __PVOP_CALL(rettype, op, \
669 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
670 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
671 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
672#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
673 __PVOP_VCALL(op, \
674 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
675 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
676 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
677#else
678#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
679 __PVOP_CALL(rettype, op, "", "", \
680 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
681 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
682#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
683 __PVOP_VCALL(op, "", "", \
684 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
685 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
686#endif
687
688/* Lazy mode for batching updates / context switch */
689enum paravirt_lazy_mode {
690 PARAVIRT_LAZY_NONE,
691 PARAVIRT_LAZY_MMU,
692 PARAVIRT_LAZY_CPU,
693};
694
695enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
696void paravirt_start_context_switch(struct task_struct *prev);
697void paravirt_end_context_switch(struct task_struct *next);
698
699void paravirt_enter_lazy_mmu(void);
700void paravirt_leave_lazy_mmu(void);
701
702void _paravirt_nop(void);
703u32 _paravirt_ident_32(u32);
704u64 _paravirt_ident_64(u64);
705
706#define paravirt_nop ((void *)_paravirt_nop)
707
708/* These all sit in the .parainstructions section to tell us what to patch. */
709struct paravirt_patch_site {
710 u8 *instr; /* original instructions */
711 u8 instrtype; /* type of this instruction */
712 u8 len; /* length of original instruction */
713 u16 clobbers; /* what registers you may clobber */
714};
715
716extern struct paravirt_patch_site __parainstructions[],
717 __parainstructions_end[];
718
719#endif /* __ASSEMBLY__ */
720
721#endif /* _ASM_X86_PARAVIRT_TYPES_H */
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