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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/paravirt_types.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_PARAVIRT_TYPES_H
  3 #define _ASM_X86_PARAVIRT_TYPES_H
  4 
  5 /* Bitmask of what can be clobbered: usually at least eax. */
  6 #define CLBR_NONE 0
  7 #define CLBR_EAX  (1 << 0)
  8 #define CLBR_ECX  (1 << 1)
  9 #define CLBR_EDX  (1 << 2)
 10 #define CLBR_EDI  (1 << 3)
 11 
 12 #ifdef CONFIG_X86_32
 13 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
 14 #define CLBR_ANY  ((1 << 4) - 1)
 15 
 16 #define CLBR_ARG_REGS   (CLBR_EAX | CLBR_EDX | CLBR_ECX)
 17 #define CLBR_RET_REG    (CLBR_EAX | CLBR_EDX)
 18 #define CLBR_SCRATCH    (0)
 19 #else
 20 #define CLBR_RAX  CLBR_EAX
 21 #define CLBR_RCX  CLBR_ECX
 22 #define CLBR_RDX  CLBR_EDX
 23 #define CLBR_RDI  CLBR_EDI
 24 #define CLBR_RSI  (1 << 4)
 25 #define CLBR_R8   (1 << 5)
 26 #define CLBR_R9   (1 << 6)
 27 #define CLBR_R10  (1 << 7)
 28 #define CLBR_R11  (1 << 8)
 29 
 30 #define CLBR_ANY  ((1 << 9) - 1)
 31 
 32 #define CLBR_ARG_REGS   (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
 33                          CLBR_RCX | CLBR_R8 | CLBR_R9)
 34 #define CLBR_RET_REG    (CLBR_RAX)
 35 #define CLBR_SCRATCH    (CLBR_R10 | CLBR_R11)
 36 
 37 #endif /* X86_64 */
 38 
 39 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
 40 
 41 #ifndef __ASSEMBLY__
 42 
 43 #include <asm/desc_defs.h>
 44 #include <asm/kmap_types.h>
 45 #include <asm/pgtable_types.h>
 46 
 47 struct page;
 48 struct thread_struct;
 49 struct desc_ptr;
 50 struct tss_struct;
 51 struct mm_struct;
 52 struct desc_struct;
 53 struct task_struct;
 54 struct cpumask;
 55 struct flush_tlb_info;
 56 
 57 /*
 58  * Wrapper type for pointers to code which uses the non-standard
 59  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
 60  */
 61 struct paravirt_callee_save {
 62         void *func;
 63 };
 64 
 65 /* general info */
 66 struct pv_info {
 67         unsigned int kernel_rpl;
 68         int shared_kernel_pmd;
 69 
 70 #ifdef CONFIG_X86_64
 71         u16 extra_user_64bit_cs;  /* __USER_CS if none */
 72 #endif
 73 
 74         const char *name;
 75 };
 76 
 77 struct 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 } __no_randomize_layout;
 89 
 90 
 91 struct pv_lazy_ops {
 92         /* Set deferred update mode, used for batching operations. */
 93         void (*enter)(void);
 94         void (*leave)(void);
 95         void (*flush)(void);
 96 } __no_randomize_layout;
 97 
 98 struct pv_time_ops {
 99         unsigned long long (*sched_clock)(void);
100         unsigned long long (*steal_clock)(int cpu);
101 } __no_randomize_layout;
102 
103 struct pv_cpu_ops {
104         /* hooks for various privileged instructions */
105         unsigned long (*get_debugreg)(int regno);
106         void (*set_debugreg)(int regno, unsigned long value);
107 
108         unsigned long (*read_cr0)(void);
109         void (*write_cr0)(unsigned long);
110 
111         void (*write_cr4)(unsigned long);
112 
113 #ifdef CONFIG_X86_64
114         unsigned long (*read_cr8)(void);
115         void (*write_cr8)(unsigned long);
116 #endif
117 
118         /* Segment descriptor handling */
119         void (*load_tr_desc)(void);
120         void (*load_gdt)(const struct desc_ptr *);
121         void (*load_idt)(const struct desc_ptr *);
122         void (*set_ldt)(const void *desc, unsigned entries);
123         unsigned long (*store_tr)(void);
124         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
125 #ifdef CONFIG_X86_64
126         void (*load_gs_index)(unsigned int idx);
127 #endif
128         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
129                                 const void *desc);
130         void (*write_gdt_entry)(struct desc_struct *,
131                                 int entrynum, const void *desc, int size);
132         void (*write_idt_entry)(gate_desc *,
133                                 int entrynum, const gate_desc *gate);
134         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
135         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
136 
137         void (*load_sp0)(unsigned long sp0);
138 
139         void (*set_iopl_mask)(unsigned mask);
140 
141         void (*wbinvd)(void);
142         void (*io_delay)(void);
143 
144         /* cpuid emulation, mostly so that caps bits can be disabled */
145         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
146                       unsigned int *ecx, unsigned int *edx);
147 
148         /* Unsafe MSR operations.  These will warn or panic on failure. */
149         u64 (*read_msr)(unsigned int msr);
150         void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
151 
152         /*
153          * Safe MSR operations.
154          * read sets err to 0 or -EIO.  write returns 0 or -EIO.
155          */
156         u64 (*read_msr_safe)(unsigned int msr, int *err);
157         int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
158 
159         u64 (*read_pmc)(int counter);
160 
161         /*
162          * Switch to usermode gs and return to 64-bit usermode using
163          * sysret.  Only used in 64-bit kernels to return to 64-bit
164          * processes.  Usermode register state, including %rsp, must
165          * already be restored.
166          */
167         void (*usergs_sysret64)(void);
168 
169         /* Normal iret.  Jump to this with the standard iret stack
170            frame set up. */
171         void (*iret)(void);
172 
173         void (*swapgs)(void);
174 
175         void (*start_context_switch)(struct task_struct *prev);
176         void (*end_context_switch)(struct task_struct *next);
177 } __no_randomize_layout;
178 
179 struct pv_irq_ops {
180         /*
181          * Get/set interrupt state.  save_fl and restore_fl are only
182          * expected to use X86_EFLAGS_IF; all other bits
183          * returned from save_fl are undefined, and may be ignored by
184          * restore_fl.
185          *
186          * NOTE: These functions callers expect the callee to preserve
187          * more registers than the standard C calling convention.
188          */
189         struct paravirt_callee_save save_fl;
190         struct paravirt_callee_save restore_fl;
191         struct paravirt_callee_save irq_disable;
192         struct paravirt_callee_save irq_enable;
193 
194         void (*safe_halt)(void);
195         void (*halt)(void);
196 
197 } __no_randomize_layout;
198 
199 struct pv_mmu_ops {
200         unsigned long (*read_cr2)(void);
201         void (*write_cr2)(unsigned long);
202 
203         unsigned long (*read_cr3)(void);
204         void (*write_cr3)(unsigned long);
205 
206         /*
207          * Hooks for intercepting the creation/use/destruction of an
208          * mm_struct.
209          */
210         void (*activate_mm)(struct mm_struct *prev,
211                             struct mm_struct *next);
212         void (*dup_mmap)(struct mm_struct *oldmm,
213                          struct mm_struct *mm);
214         void (*exit_mmap)(struct mm_struct *mm);
215 
216 
217         /* TLB operations */
218         void (*flush_tlb_user)(void);
219         void (*flush_tlb_kernel)(void);
220         void (*flush_tlb_single)(unsigned long addr);
221         void (*flush_tlb_others)(const struct cpumask *cpus,
222                                  const struct flush_tlb_info *info);
223 
224         /* Hooks for allocating and freeing a pagetable top-level */
225         int  (*pgd_alloc)(struct mm_struct *mm);
226         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
227 
228         /*
229          * Hooks for allocating/releasing pagetable pages when they're
230          * attached to a pagetable
231          */
232         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
233         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
234         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
235         void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
236         void (*release_pte)(unsigned long pfn);
237         void (*release_pmd)(unsigned long pfn);
238         void (*release_pud)(unsigned long pfn);
239         void (*release_p4d)(unsigned long pfn);
240 
241         /* Pagetable manipulation functions */
242         void (*set_pte)(pte_t *ptep, pte_t pteval);
243         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
244                            pte_t *ptep, pte_t pteval);
245         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
246 
247         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
248                                         pte_t *ptep);
249         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
250                                         pte_t *ptep, pte_t pte);
251 
252         struct paravirt_callee_save pte_val;
253         struct paravirt_callee_save make_pte;
254 
255         struct paravirt_callee_save pgd_val;
256         struct paravirt_callee_save make_pgd;
257 
258 #if CONFIG_PGTABLE_LEVELS >= 3
259 #ifdef CONFIG_X86_PAE
260         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
261         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
262                           pte_t *ptep);
263         void (*pmd_clear)(pmd_t *pmdp);
264 
265 #endif  /* CONFIG_X86_PAE */
266 
267         void (*set_pud)(pud_t *pudp, pud_t pudval);
268 
269         struct paravirt_callee_save pmd_val;
270         struct paravirt_callee_save make_pmd;
271 
272 #if CONFIG_PGTABLE_LEVELS >= 4
273         struct paravirt_callee_save pud_val;
274         struct paravirt_callee_save make_pud;
275 
276         void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
277 
278 #if CONFIG_PGTABLE_LEVELS >= 5
279         struct paravirt_callee_save p4d_val;
280         struct paravirt_callee_save make_p4d;
281 
282         void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
283 #endif  /* CONFIG_PGTABLE_LEVELS >= 5 */
284 
285 #endif  /* CONFIG_PGTABLE_LEVELS >= 4 */
286 
287 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
288 
289         struct pv_lazy_ops lazy_mode;
290 
291         /* dom0 ops */
292 
293         /* Sometimes the physical address is a pfn, and sometimes its
294            an mfn.  We can tell which is which from the index. */
295         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
296                            phys_addr_t phys, pgprot_t flags);
297 } __no_randomize_layout;
298 
299 struct arch_spinlock;
300 #ifdef CONFIG_SMP
301 #include <asm/spinlock_types.h>
302 #endif
303 
304 struct qspinlock;
305 
306 struct pv_lock_ops {
307         void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
308         struct paravirt_callee_save queued_spin_unlock;
309 
310         void (*wait)(u8 *ptr, u8 val);
311         void (*kick)(int cpu);
312 
313         struct paravirt_callee_save vcpu_is_preempted;
314 } __no_randomize_layout;
315 
316 /* This contains all the paravirt structures: we get a convenient
317  * number for each function using the offset which we use to indicate
318  * what to patch. */
319 struct paravirt_patch_template {
320         struct pv_init_ops pv_init_ops;
321         struct pv_time_ops pv_time_ops;
322         struct pv_cpu_ops pv_cpu_ops;
323         struct pv_irq_ops pv_irq_ops;
324         struct pv_mmu_ops pv_mmu_ops;
325         struct pv_lock_ops pv_lock_ops;
326 } __no_randomize_layout;
327 
328 extern struct pv_info pv_info;
329 extern struct pv_init_ops pv_init_ops;
330 extern struct pv_time_ops pv_time_ops;
331 extern struct pv_cpu_ops pv_cpu_ops;
332 extern struct pv_irq_ops pv_irq_ops;
333 extern struct pv_mmu_ops pv_mmu_ops;
334 extern struct pv_lock_ops pv_lock_ops;
335 
336 #define PARAVIRT_PATCH(x)                                       \
337         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
338 
339 #define paravirt_type(op)                               \
340         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
341         [paravirt_opptr] "i" (&(op))
342 #define paravirt_clobber(clobber)               \
343         [paravirt_clobber] "i" (clobber)
344 
345 /*
346  * Generate some code, and mark it as patchable by the
347  * apply_paravirt() alternate instruction patcher.
348  */
349 #define _paravirt_alt(insn_string, type, clobber)       \
350         "771:\n\t" insn_string "\n" "772:\n"            \
351         ".pushsection .parainstructions,\"a\"\n"        \
352         _ASM_ALIGN "\n"                                 \
353         _ASM_PTR " 771b\n"                              \
354         "  .byte " type "\n"                            \
355         "  .byte 772b-771b\n"                           \
356         "  .short " clobber "\n"                        \
357         ".popsection\n"
358 
359 /* Generate patchable code, with the default asm parameters. */
360 #define paravirt_alt(insn_string)                                       \
361         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
362 
363 /* Simple instruction patching code. */
364 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
365 
366 #define DEF_NATIVE(ops, name, code)                                     \
367         __visible extern const char start_##ops##_##name[], end_##ops##_##name[];       \
368         asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))
369 
370 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
371 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
372 unsigned paravirt_patch_call(void *insnbuf,
373                              const void *target, u16 tgt_clobbers,
374                              unsigned long addr, u16 site_clobbers,
375                              unsigned len);
376 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
377                             unsigned long addr, unsigned len);
378 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
379                                 unsigned long addr, unsigned len);
380 
381 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
382                               const char *start, const char *end);
383 
384 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
385                       unsigned long addr, unsigned len);
386 
387 int paravirt_disable_iospace(void);
388 
389 /*
390  * This generates an indirect call based on the operation type number.
391  * The type number, computed in PARAVIRT_PATCH, is derived from the
392  * offset into the paravirt_patch_template structure, and can therefore be
393  * freely converted back into a structure offset.
394  */
395 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
396 
397 /*
398  * These macros are intended to wrap calls through one of the paravirt
399  * ops structs, so that they can be later identified and patched at
400  * runtime.
401  *
402  * Normally, a call to a pv_op function is a simple indirect call:
403  * (pv_op_struct.operations)(args...).
404  *
405  * Unfortunately, this is a relatively slow operation for modern CPUs,
406  * because it cannot necessarily determine what the destination
407  * address is.  In this case, the address is a runtime constant, so at
408  * the very least we can patch the call to e a simple direct call, or
409  * ideally, patch an inline implementation into the callsite.  (Direct
410  * calls are essentially free, because the call and return addresses
411  * are completely predictable.)
412  *
413  * For i386, these macros rely on the standard gcc "regparm(3)" calling
414  * convention, in which the first three arguments are placed in %eax,
415  * %edx, %ecx (in that order), and the remaining arguments are placed
416  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
417  * to be modified (either clobbered or used for return values).
418  * X86_64, on the other hand, already specifies a register-based calling
419  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
420  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
421  * special handling for dealing with 4 arguments, unlike i386.
422  * However, x86_64 also have to clobber all caller saved registers, which
423  * unfortunately, are quite a bit (r8 - r11)
424  *
425  * The call instruction itself is marked by placing its start address
426  * and size into the .parainstructions section, so that
427  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
428  * appropriate patching under the control of the backend pv_init_ops
429  * implementation.
430  *
431  * Unfortunately there's no way to get gcc to generate the args setup
432  * for the call, and then allow the call itself to be generated by an
433  * inline asm.  Because of this, we must do the complete arg setup and
434  * return value handling from within these macros.  This is fairly
435  * cumbersome.
436  *
437  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
438  * It could be extended to more arguments, but there would be little
439  * to be gained from that.  For each number of arguments, there are
440  * the two VCALL and CALL variants for void and non-void functions.
441  *
442  * When there is a return value, the invoker of the macro must specify
443  * the return type.  The macro then uses sizeof() on that type to
444  * determine whether its a 32 or 64 bit value, and places the return
445  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
446  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
447  * the return value size.
448  *
449  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
450  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
451  * in low,high order
452  *
453  * Small structures are passed and returned in registers.  The macro
454  * calling convention can't directly deal with this, so the wrapper
455  * functions must do this.
456  *
457  * These PVOP_* macros are only defined within this header.  This
458  * means that all uses must be wrapped in inline functions.  This also
459  * makes sure the incoming and outgoing types are always correct.
460  */
461 #ifdef CONFIG_X86_32
462 #define PVOP_VCALL_ARGS                                                 \
463         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
464 
465 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
466 
467 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
468 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
469 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
470 
471 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
472                                         "=c" (__ecx)
473 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
474 
475 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
476 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
477 
478 #define EXTRA_CLOBBERS
479 #define VEXTRA_CLOBBERS
480 #else  /* CONFIG_X86_64 */
481 /* [re]ax isn't an arg, but the return val */
482 #define PVOP_VCALL_ARGS                                         \
483         unsigned long __edi = __edi, __esi = __esi,             \
484                 __edx = __edx, __ecx = __ecx, __eax = __eax;
485 
486 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
487 
488 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
489 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
490 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
491 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
492 
493 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
494                                 "=S" (__esi), "=d" (__edx),             \
495                                 "=c" (__ecx)
496 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
497 
498 /* void functions are still allowed [re]ax for scratch */
499 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
500 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
501 
502 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
503 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
504 #endif  /* CONFIG_X86_32 */
505 
506 #ifdef CONFIG_PARAVIRT_DEBUG
507 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
508 #else
509 #define PVOP_TEST_NULL(op)      ((void)op)
510 #endif
511 
512 #define PVOP_RETMASK(rettype)                                           \
513         ({      unsigned long __mask = ~0UL;                            \
514                 switch (sizeof(rettype)) {                              \
515                 case 1: __mask =       0xffUL; break;                   \
516                 case 2: __mask =     0xffffUL; break;                   \
517                 case 4: __mask = 0xffffffffUL; break;                   \
518                 default: break;                                         \
519                 }                                                       \
520                 __mask;                                                 \
521         })
522 
523 
524 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
525                       pre, post, ...)                                   \
526         ({                                                              \
527                 rettype __ret;                                          \
528                 PVOP_CALL_ARGS;                                         \
529                 PVOP_TEST_NULL(op);                                     \
530                 /* This is 32-bit specific, but is okay in 64-bit */    \
531                 /* since this condition will never hold */              \
532                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
533                         asm volatile(pre                                \
534                                      paravirt_alt(PARAVIRT_CALL)        \
535                                      post                               \
536                                      : call_clbr, ASM_CALL_CONSTRAINT   \
537                                      : paravirt_type(op),               \
538                                        paravirt_clobber(clbr),          \
539                                        ##__VA_ARGS__                    \
540                                      : "memory", "cc" extra_clbr);      \
541                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
542                 } else {                                                \
543                         asm volatile(pre                                \
544                                      paravirt_alt(PARAVIRT_CALL)        \
545                                      post                               \
546                                      : call_clbr, ASM_CALL_CONSTRAINT   \
547                                      : paravirt_type(op),               \
548                                        paravirt_clobber(clbr),          \
549                                        ##__VA_ARGS__                    \
550                                      : "memory", "cc" extra_clbr);      \
551                         __ret = (rettype)(__eax & PVOP_RETMASK(rettype));       \
552                 }                                                       \
553                 __ret;                                                  \
554         })
555 
556 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
557         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
558                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
559 
560 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
561         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
562                       PVOP_CALLEE_CLOBBERS, ,                           \
563                       pre, post, ##__VA_ARGS__)
564 
565 
566 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
567         ({                                                              \
568                 PVOP_VCALL_ARGS;                                        \
569                 PVOP_TEST_NULL(op);                                     \
570                 asm volatile(pre                                        \
571                              paravirt_alt(PARAVIRT_CALL)                \
572                              post                                       \
573                              : call_clbr, ASM_CALL_CONSTRAINT           \
574                              : paravirt_type(op),                       \
575                                paravirt_clobber(clbr),                  \
576                                ##__VA_ARGS__                            \
577                              : "memory", "cc" extra_clbr);              \
578         })
579 
580 #define __PVOP_VCALL(op, pre, post, ...)                                \
581         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
582                        VEXTRA_CLOBBERS,                                 \
583                        pre, post, ##__VA_ARGS__)
584 
585 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
586         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
587                       PVOP_VCALLEE_CLOBBERS, ,                          \
588                       pre, post, ##__VA_ARGS__)
589 
590 
591 
592 #define PVOP_CALL0(rettype, op)                                         \
593         __PVOP_CALL(rettype, op, "", "")
594 #define PVOP_VCALL0(op)                                                 \
595         __PVOP_VCALL(op, "", "")
596 
597 #define PVOP_CALLEE0(rettype, op)                                       \
598         __PVOP_CALLEESAVE(rettype, op, "", "")
599 #define PVOP_VCALLEE0(op)                                               \
600         __PVOP_VCALLEESAVE(op, "", "")
601 
602 
603 #define PVOP_CALL1(rettype, op, arg1)                                   \
604         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
605 #define PVOP_VCALL1(op, arg1)                                           \
606         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
607 
608 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
609         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
610 #define PVOP_VCALLEE1(op, arg1)                                         \
611         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
612 
613 
614 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
615         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
616                     PVOP_CALL_ARG2(arg2))
617 #define PVOP_VCALL2(op, arg1, arg2)                                     \
618         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
619                      PVOP_CALL_ARG2(arg2))
620 
621 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
622         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
623                           PVOP_CALL_ARG2(arg2))
624 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
625         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
626                            PVOP_CALL_ARG2(arg2))
627 
628 
629 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
630         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
631                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
632 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
633         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
634                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
635 
636 /* This is the only difference in x86_64. We can make it much simpler */
637 #ifdef CONFIG_X86_32
638 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
639         __PVOP_CALL(rettype, op,                                        \
640                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
641                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
642                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
643 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
644         __PVOP_VCALL(op,                                                \
645                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
646                     "" ((u32)(arg1)), "1" ((u32)(arg2)),               \
647                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
648 #else
649 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
650         __PVOP_CALL(rettype, op, "", "",                                \
651                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
652                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
653 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
654         __PVOP_VCALL(op, "", "",                                        \
655                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
656                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
657 #endif
658 
659 /* Lazy mode for batching updates / context switch */
660 enum paravirt_lazy_mode {
661         PARAVIRT_LAZY_NONE,
662         PARAVIRT_LAZY_MMU,
663         PARAVIRT_LAZY_CPU,
664 };
665 
666 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
667 void paravirt_start_context_switch(struct task_struct *prev);
668 void paravirt_end_context_switch(struct task_struct *next);
669 
670 void paravirt_enter_lazy_mmu(void);
671 void paravirt_leave_lazy_mmu(void);
672 void paravirt_flush_lazy_mmu(void);
673 
674 void _paravirt_nop(void);
675 u32 _paravirt_ident_32(u32);
676 u64 _paravirt_ident_64(u64);
677 
678 #define paravirt_nop    ((void *)_paravirt_nop)
679 
680 /* These all sit in the .parainstructions section to tell us what to patch. */
681 struct paravirt_patch_site {
682         u8 *instr;              /* original instructions */
683         u8 instrtype;           /* type of this instruction */
684         u8 len;                 /* length of original instruction */
685         u16 clobbers;           /* what registers you may clobber */
686 };
687 
688 extern struct paravirt_patch_site __parainstructions[],
689         __parainstructions_end[];
690 
691 #endif  /* __ASSEMBLY__ */
692 
693 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */
694 

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