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

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