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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 #include <asm/nospec-branch.h>
 47 
 48 struct page;
 49 struct thread_struct;
 50 struct desc_ptr;
 51 struct tss_struct;
 52 struct mm_struct;
 53 struct desc_struct;
 54 struct task_struct;
 55 struct cpumask;
 56 struct flush_tlb_info;
 57 
 58 /*
 59  * Wrapper type for pointers to code which uses the non-standard
 60  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
 61  */
 62 struct paravirt_callee_save {
 63         void *func;
 64 };
 65 
 66 /* general info */
 67 struct pv_info {
 68         unsigned int kernel_rpl;
 69         int shared_kernel_pmd;
 70 
 71 #ifdef CONFIG_X86_64
 72         u16 extra_user_64bit_cs;  /* __USER_CS if none */
 73 #endif
 74 
 75         const char *name;
 76 };
 77 
 78 struct pv_init_ops {
 79         /*
 80          * Patch may replace one of the defined code sequences with
 81          * arbitrary code, subject to the same register constraints.
 82          * This generally means the code is not free to clobber any
 83          * registers other than EAX.  The patch function should return
 84          * the number of bytes of code generated, as we nop pad the
 85          * rest in generic code.
 86          */
 87         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
 88                           unsigned long addr, unsigned len);
 89 } __no_randomize_layout;
 90 
 91 
 92 struct pv_lazy_ops {
 93         /* Set deferred update mode, used for batching operations. */
 94         void (*enter)(void);
 95         void (*leave)(void);
 96         void (*flush)(void);
 97 } __no_randomize_layout;
 98 
 99 struct pv_time_ops {
100         unsigned long long (*sched_clock)(void);
101         unsigned long long (*steal_clock)(int cpu);
102 } __no_randomize_layout;
103 
104 struct pv_cpu_ops {
105         /* hooks for various privileged instructions */
106         unsigned long (*get_debugreg)(int regno);
107         void (*set_debugreg)(int regno, unsigned long value);
108 
109         unsigned long (*read_cr0)(void);
110         void (*write_cr0)(unsigned long);
111 
112         void (*write_cr4)(unsigned long);
113 
114 #ifdef CONFIG_X86_64
115         unsigned long (*read_cr8)(void);
116         void (*write_cr8)(unsigned long);
117 #endif
118 
119         /* Segment descriptor handling */
120         void (*load_tr_desc)(void);
121         void (*load_gdt)(const struct desc_ptr *);
122         void (*load_idt)(const struct desc_ptr *);
123         void (*set_ldt)(const void *desc, unsigned entries);
124         unsigned long (*store_tr)(void);
125         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
126 #ifdef CONFIG_X86_64
127         void (*load_gs_index)(unsigned int idx);
128 #endif
129         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
130                                 const void *desc);
131         void (*write_gdt_entry)(struct desc_struct *,
132                                 int entrynum, const void *desc, int size);
133         void (*write_idt_entry)(gate_desc *,
134                                 int entrynum, const gate_desc *gate);
135         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
136         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
137 
138         void (*load_sp0)(unsigned long sp0);
139 
140         void (*set_iopl_mask)(unsigned mask);
141 
142         void (*wbinvd)(void);
143         void (*io_delay)(void);
144 
145         /* cpuid emulation, mostly so that caps bits can be disabled */
146         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
147                       unsigned int *ecx, unsigned int *edx);
148 
149         /* Unsafe MSR operations.  These will warn or panic on failure. */
150         u64 (*read_msr)(unsigned int msr);
151         void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
152 
153         /*
154          * Safe MSR operations.
155          * read sets err to 0 or -EIO.  write returns 0 or -EIO.
156          */
157         u64 (*read_msr_safe)(unsigned int msr, int *err);
158         int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
159 
160         u64 (*read_pmc)(int counter);
161 
162         /*
163          * Switch to usermode gs and return to 64-bit usermode using
164          * sysret.  Only used in 64-bit kernels to return to 64-bit
165          * processes.  Usermode register state, including %rsp, must
166          * already be restored.
167          */
168         void (*usergs_sysret64)(void);
169 
170         /* Normal iret.  Jump to this with the standard iret stack
171            frame set up. */
172         void (*iret)(void);
173 
174         void (*swapgs)(void);
175 
176         void (*start_context_switch)(struct task_struct *prev);
177         void (*end_context_switch)(struct task_struct *next);
178 } __no_randomize_layout;
179 
180 struct pv_irq_ops {
181         /*
182          * Get/set interrupt state.  save_fl and restore_fl are only
183          * expected to use X86_EFLAGS_IF; all other bits
184          * returned from save_fl are undefined, and may be ignored by
185          * restore_fl.
186          *
187          * NOTE: These functions callers expect the callee to preserve
188          * more registers than the standard C calling convention.
189          */
190         struct paravirt_callee_save save_fl;
191         struct paravirt_callee_save restore_fl;
192         struct paravirt_callee_save irq_disable;
193         struct paravirt_callee_save irq_enable;
194 
195         void (*safe_halt)(void);
196         void (*halt)(void);
197 
198 } __no_randomize_layout;
199 
200 struct pv_mmu_ops {
201         unsigned long (*read_cr2)(void);
202         void (*write_cr2)(unsigned long);
203 
204         unsigned long (*read_cr3)(void);
205         void (*write_cr3)(unsigned long);
206 
207         /*
208          * Hooks for intercepting the creation/use/destruction of an
209          * mm_struct.
210          */
211         void (*activate_mm)(struct mm_struct *prev,
212                             struct mm_struct *next);
213         void (*dup_mmap)(struct mm_struct *oldmm,
214                          struct mm_struct *mm);
215         void (*exit_mmap)(struct mm_struct *mm);
216 
217 
218         /* TLB operations */
219         void (*flush_tlb_user)(void);
220         void (*flush_tlb_kernel)(void);
221         void (*flush_tlb_one_user)(unsigned long addr);
222         void (*flush_tlb_others)(const struct cpumask *cpus,
223                                  const struct flush_tlb_info *info);
224 
225         /* Hooks for allocating and freeing a pagetable top-level */
226         int  (*pgd_alloc)(struct mm_struct *mm);
227         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
228 
229         /*
230          * Hooks for allocating/releasing pagetable pages when they're
231          * attached to a pagetable
232          */
233         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
234         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
235         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
236         void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
237         void (*release_pte)(unsigned long pfn);
238         void (*release_pmd)(unsigned long pfn);
239         void (*release_pud)(unsigned long pfn);
240         void (*release_p4d)(unsigned long pfn);
241 
242         /* Pagetable manipulation functions */
243         void (*set_pte)(pte_t *ptep, pte_t pteval);
244         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
245                            pte_t *ptep, pte_t pteval);
246         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
247 
248         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
249                                         pte_t *ptep);
250         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
251                                         pte_t *ptep, pte_t pte);
252 
253         struct paravirt_callee_save pte_val;
254         struct paravirt_callee_save make_pte;
255 
256         struct paravirt_callee_save pgd_val;
257         struct paravirt_callee_save make_pgd;
258 
259 #if CONFIG_PGTABLE_LEVELS >= 3
260 #ifdef CONFIG_X86_PAE
261         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
262         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
263                           pte_t *ptep);
264         void (*pmd_clear)(pmd_t *pmdp);
265 
266 #endif  /* CONFIG_X86_PAE */
267 
268         void (*set_pud)(pud_t *pudp, pud_t pudval);
269 
270         struct paravirt_callee_save pmd_val;
271         struct paravirt_callee_save make_pmd;
272 
273 #if CONFIG_PGTABLE_LEVELS >= 4
274         struct paravirt_callee_save pud_val;
275         struct paravirt_callee_save make_pud;
276 
277         void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
278 
279 #if CONFIG_PGTABLE_LEVELS >= 5
280         struct paravirt_callee_save p4d_val;
281         struct paravirt_callee_save make_p4d;
282 
283         void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
284 #endif  /* CONFIG_PGTABLE_LEVELS >= 5 */
285 
286 #endif  /* CONFIG_PGTABLE_LEVELS >= 4 */
287 
288 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
289 
290         struct pv_lazy_ops lazy_mode;
291 
292         /* dom0 ops */
293 
294         /* Sometimes the physical address is a pfn, and sometimes its
295            an mfn.  We can tell which is which from the index. */
296         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
297                            phys_addr_t phys, pgprot_t flags);
298 } __no_randomize_layout;
299 
300 struct arch_spinlock;
301 #ifdef CONFIG_SMP
302 #include <asm/spinlock_types.h>
303 #endif
304 
305 struct qspinlock;
306 
307 struct pv_lock_ops {
308         void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
309         struct paravirt_callee_save queued_spin_unlock;
310 
311         void (*wait)(u8 *ptr, u8 val);
312         void (*kick)(int cpu);
313 
314         struct paravirt_callee_save vcpu_is_preempted;
315 } __no_randomize_layout;
316 
317 /* This contains all the paravirt structures: we get a convenient
318  * number for each function using the offset which we use to indicate
319  * what to patch. */
320 struct paravirt_patch_template {
321         struct pv_init_ops pv_init_ops;
322         struct pv_time_ops pv_time_ops;
323         struct pv_cpu_ops pv_cpu_ops;
324         struct pv_irq_ops pv_irq_ops;
325         struct pv_mmu_ops pv_mmu_ops;
326         struct pv_lock_ops pv_lock_ops;
327 } __no_randomize_layout;
328 
329 extern struct pv_info pv_info;
330 extern struct pv_init_ops pv_init_ops;
331 extern struct pv_time_ops pv_time_ops;
332 extern struct pv_cpu_ops pv_cpu_ops;
333 extern struct pv_irq_ops pv_irq_ops;
334 extern struct pv_mmu_ops pv_mmu_ops;
335 extern struct pv_lock_ops pv_lock_ops;
336 
337 #define PARAVIRT_PATCH(x)                                       \
338         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
339 
340 #define paravirt_type(op)                               \
341         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
342         [paravirt_opptr] "i" (&(op))
343 #define paravirt_clobber(clobber)               \
344         [paravirt_clobber] "i" (clobber)
345 
346 /*
347  * Generate some code, and mark it as patchable by the
348  * apply_paravirt() alternate instruction patcher.
349  */
350 #define _paravirt_alt(insn_string, type, clobber)       \
351         "771:\n\t" insn_string "\n" "772:\n"            \
352         ".pushsection .parainstructions,\"a\"\n"        \
353         _ASM_ALIGN "\n"                                 \
354         _ASM_PTR " 771b\n"                              \
355         "  .byte " type "\n"                            \
356         "  .byte 772b-771b\n"                           \
357         "  .short " clobber "\n"                        \
358         ".popsection\n"
359 
360 /* Generate patchable code, with the default asm parameters. */
361 #define paravirt_alt(insn_string)                                       \
362         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
363 
364 /* Simple instruction patching code. */
365 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
366 
367 #define DEF_NATIVE(ops, name, code)                                     \
368         __visible extern const char start_##ops##_##name[], end_##ops##_##name[];       \
369         asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))
370 
371 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
372 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
373 unsigned paravirt_patch_call(void *insnbuf,
374                              const void *target, u16 tgt_clobbers,
375                              unsigned long addr, u16 site_clobbers,
376                              unsigned len);
377 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
378                             unsigned long addr, unsigned len);
379 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
380                                 unsigned long addr, unsigned len);
381 
382 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
383                               const char *start, const char *end);
384 
385 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
386                       unsigned long addr, unsigned len);
387 
388 int paravirt_disable_iospace(void);
389 
390 /*
391  * This generates an indirect call based on the operation type number.
392  * The type number, computed in PARAVIRT_PATCH, is derived from the
393  * offset into the paravirt_patch_template structure, and can therefore be
394  * freely converted back into a structure offset.
395  */
396 #define PARAVIRT_CALL                                   \
397         ANNOTATE_RETPOLINE_SAFE                         \
398         "call *%c[paravirt_opptr];"
399 
400 /*
401  * These macros are intended to wrap calls through one of the paravirt
402  * ops structs, so that they can be later identified and patched at
403  * runtime.
404  *
405  * Normally, a call to a pv_op function is a simple indirect call:
406  * (pv_op_struct.operations)(args...).
407  *
408  * Unfortunately, this is a relatively slow operation for modern CPUs,
409  * because it cannot necessarily determine what the destination
410  * address is.  In this case, the address is a runtime constant, so at
411  * the very least we can patch the call to e a simple direct call, or
412  * ideally, patch an inline implementation into the callsite.  (Direct
413  * calls are essentially free, because the call and return addresses
414  * are completely predictable.)
415  *
416  * For i386, these macros rely on the standard gcc "regparm(3)" calling
417  * convention, in which the first three arguments are placed in %eax,
418  * %edx, %ecx (in that order), and the remaining arguments are placed
419  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
420  * to be modified (either clobbered or used for return values).
421  * X86_64, on the other hand, already specifies a register-based calling
422  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
423  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
424  * special handling for dealing with 4 arguments, unlike i386.
425  * However, x86_64 also have to clobber all caller saved registers, which
426  * unfortunately, are quite a bit (r8 - r11)
427  *
428  * The call instruction itself is marked by placing its start address
429  * and size into the .parainstructions section, so that
430  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
431  * appropriate patching under the control of the backend pv_init_ops
432  * implementation.
433  *
434  * Unfortunately there's no way to get gcc to generate the args setup
435  * for the call, and then allow the call itself to be generated by an
436  * inline asm.  Because of this, we must do the complete arg setup and
437  * return value handling from within these macros.  This is fairly
438  * cumbersome.
439  *
440  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
441  * It could be extended to more arguments, but there would be little
442  * to be gained from that.  For each number of arguments, there are
443  * the two VCALL and CALL variants for void and non-void functions.
444  *
445  * When there is a return value, the invoker of the macro must specify
446  * the return type.  The macro then uses sizeof() on that type to
447  * determine whether its a 32 or 64 bit value, and places the return
448  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
449  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
450  * the return value size.
451  *
452  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
453  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
454  * in low,high order
455  *
456  * Small structures are passed and returned in registers.  The macro
457  * calling convention can't directly deal with this, so the wrapper
458  * functions must do this.
459  *
460  * These PVOP_* macros are only defined within this header.  This
461  * means that all uses must be wrapped in inline functions.  This also
462  * makes sure the incoming and outgoing types are always correct.
463  */
464 #ifdef CONFIG_X86_32
465 #define PVOP_VCALL_ARGS                                                 \
466         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
467 
468 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
469 
470 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
471 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
472 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
473 
474 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
475                                         "=c" (__ecx)
476 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
477 
478 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
479 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
480 
481 #define EXTRA_CLOBBERS
482 #define VEXTRA_CLOBBERS
483 #else  /* CONFIG_X86_64 */
484 /* [re]ax isn't an arg, but the return val */
485 #define PVOP_VCALL_ARGS                                         \
486         unsigned long __edi = __edi, __esi = __esi,             \
487                 __edx = __edx, __ecx = __ecx, __eax = __eax;
488 
489 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
490 
491 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
492 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
493 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
494 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
495 
496 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
497                                 "=S" (__esi), "=d" (__edx),             \
498                                 "=c" (__ecx)
499 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
500 
501 /* void functions are still allowed [re]ax for scratch */
502 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
503 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
504 
505 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
506 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
507 #endif  /* CONFIG_X86_32 */
508 
509 #ifdef CONFIG_PARAVIRT_DEBUG
510 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
511 #else
512 #define PVOP_TEST_NULL(op)      ((void)op)
513 #endif
514 
515 #define PVOP_RETMASK(rettype)                                           \
516         ({      unsigned long __mask = ~0UL;                            \
517                 switch (sizeof(rettype)) {                              \
518                 case 1: __mask =       0xffUL; break;                   \
519                 case 2: __mask =     0xffffUL; break;                   \
520                 case 4: __mask = 0xffffffffUL; break;                   \
521                 default: break;                                         \
522                 }                                                       \
523                 __mask;                                                 \
524         })
525 
526 
527 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
528                       pre, post, ...)                                   \
529         ({                                                              \
530                 rettype __ret;                                          \
531                 PVOP_CALL_ARGS;                                         \
532                 PVOP_TEST_NULL(op);                                     \
533                 /* This is 32-bit specific, but is okay in 64-bit */    \
534                 /* since this condition will never hold */              \
535                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
536                         asm volatile(pre                                \
537                                      paravirt_alt(PARAVIRT_CALL)        \
538                                      post                               \
539                                      : call_clbr, ASM_CALL_CONSTRAINT   \
540                                      : paravirt_type(op),               \
541                                        paravirt_clobber(clbr),          \
542                                        ##__VA_ARGS__                    \
543                                      : "memory", "cc" extra_clbr);      \
544                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
545                 } else {                                                \
546                         asm volatile(pre                                \
547                                      paravirt_alt(PARAVIRT_CALL)        \
548                                      post                               \
549                                      : call_clbr, ASM_CALL_CONSTRAINT   \
550                                      : paravirt_type(op),               \
551                                        paravirt_clobber(clbr),          \
552                                        ##__VA_ARGS__                    \
553                                      : "memory", "cc" extra_clbr);      \
554                         __ret = (rettype)(__eax & PVOP_RETMASK(rettype));       \
555                 }                                                       \
556                 __ret;                                                  \
557         })
558 
559 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
560         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
561                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
562 
563 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
564         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
565                       PVOP_CALLEE_CLOBBERS, ,                           \
566                       pre, post, ##__VA_ARGS__)
567 
568 
569 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
570         ({                                                              \
571                 PVOP_VCALL_ARGS;                                        \
572                 PVOP_TEST_NULL(op);                                     \
573                 asm volatile(pre                                        \
574                              paravirt_alt(PARAVIRT_CALL)                \
575                              post                                       \
576                              : call_clbr, ASM_CALL_CONSTRAINT           \
577                              : paravirt_type(op),                       \
578                                paravirt_clobber(clbr),                  \
579                                ##__VA_ARGS__                            \
580                              : "memory", "cc" extra_clbr);              \
581         })
582 
583 #define __PVOP_VCALL(op, pre, post, ...)                                \
584         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
585                        VEXTRA_CLOBBERS,                                 \
586                        pre, post, ##__VA_ARGS__)
587 
588 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
589         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
590                       PVOP_VCALLEE_CLOBBERS, ,                          \
591                       pre, post, ##__VA_ARGS__)
592 
593 
594 
595 #define PVOP_CALL0(rettype, op)                                         \
596         __PVOP_CALL(rettype, op, "", "")
597 #define PVOP_VCALL0(op)                                                 \
598         __PVOP_VCALL(op, "", "")
599 
600 #define PVOP_CALLEE0(rettype, op)                                       \
601         __PVOP_CALLEESAVE(rettype, op, "", "")
602 #define PVOP_VCALLEE0(op)                                               \
603         __PVOP_VCALLEESAVE(op, "", "")
604 
605 
606 #define PVOP_CALL1(rettype, op, arg1)                                   \
607         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
608 #define PVOP_VCALL1(op, arg1)                                           \
609         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
610 
611 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
612         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
613 #define PVOP_VCALLEE1(op, arg1)                                         \
614         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
615 
616 
617 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
618         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
619                     PVOP_CALL_ARG2(arg2))
620 #define PVOP_VCALL2(op, arg1, arg2)                                     \
621         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
622                      PVOP_CALL_ARG2(arg2))
623 
624 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
625         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
626                           PVOP_CALL_ARG2(arg2))
627 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
628         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
629                            PVOP_CALL_ARG2(arg2))
630 
631 
632 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
633         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
634                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
635 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
636         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
637                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
638 
639 /* This is the only difference in x86_64. We can make it much simpler */
640 #ifdef CONFIG_X86_32
641 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
642         __PVOP_CALL(rettype, op,                                        \
643                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
644                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
645                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
646 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
647         __PVOP_VCALL(op,                                                \
648                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
649                     "" ((u32)(arg1)), "1" ((u32)(arg2)),               \
650                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
651 #else
652 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
653         __PVOP_CALL(rettype, op, "", "",                                \
654                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
655                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
656 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
657         __PVOP_VCALL(op, "", "",                                        \
658                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
659                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
660 #endif
661 
662 /* Lazy mode for batching updates / context switch */
663 enum paravirt_lazy_mode {
664         PARAVIRT_LAZY_NONE,
665         PARAVIRT_LAZY_MMU,
666         PARAVIRT_LAZY_CPU,
667 };
668 
669 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
670 void paravirt_start_context_switch(struct task_struct *prev);
671 void paravirt_end_context_switch(struct task_struct *next);
672 
673 void paravirt_enter_lazy_mmu(void);
674 void paravirt_leave_lazy_mmu(void);
675 void paravirt_flush_lazy_mmu(void);
676 
677 void _paravirt_nop(void);
678 u32 _paravirt_ident_32(u32);
679 u64 _paravirt_ident_64(u64);
680 
681 #define paravirt_nop    ((void *)_paravirt_nop)
682 
683 /* These all sit in the .parainstructions section to tell us what to patch. */
684 struct paravirt_patch_site {
685         u8 *instr;              /* original instructions */
686         u8 instrtype;           /* type of this instruction */
687         u8 len;                 /* length of original instruction */
688         u16 clobbers;           /* what registers you may clobber */
689 };
690 
691 extern struct paravirt_patch_site __parainstructions[],
692         __parainstructions_end[];
693 
694 #endif  /* __ASSEMBLY__ */
695 
696 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */
697 

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