1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PARAVIRT_TYPES_H
3 #define _ASM_X86_PARAVIRT_TYPES_H
5 /* Bitmask of what can be clobbered: usually at least eax. */
7 #define CLBR_EAX (1 << 0)
8 #define CLBR_ECX (1 << 1)
9 #define CLBR_EDX (1 << 2)
10 #define CLBR_EDI (1 << 3)
13 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
14 #define CLBR_ANY ((1 << 4) - 1)
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)
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)
30 #define CLBR_ANY ((1 << 9) - 1)
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)
39 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
43 #include <asm/desc_defs.h>
44 #include <asm/kmap_types.h>
45 #include <asm/pgtable_types.h>
46 #include <asm/nospec-branch.h>
56 struct flush_tlb_info;
60 * Wrapper type for pointers to code which uses the non-standard
61 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
63 struct paravirt_callee_save {
69 #ifdef CONFIG_PARAVIRT_XXL
70 unsigned int kernel_rpl;
71 int shared_kernel_pmd;
74 u16 extra_user_64bit_cs; /* __USER_CS if none */
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.
90 unsigned (*patch)(u8 type, void *insnbuf,
91 unsigned long addr, unsigned len);
92 } __no_randomize_layout;
94 #ifdef CONFIG_PARAVIRT_XXL
96 /* Set deferred update mode, used for batching operations. */
100 } __no_randomize_layout;
104 unsigned long long (*sched_clock)(void);
105 unsigned long long (*steal_clock)(int cpu);
106 } __no_randomize_layout;
109 /* hooks for various privileged instructions */
110 void (*io_delay)(void);
112 #ifdef CONFIG_PARAVIRT_XXL
113 unsigned long (*get_debugreg)(int regno);
114 void (*set_debugreg)(int regno, unsigned long value);
116 unsigned long (*read_cr0)(void);
117 void (*write_cr0)(unsigned long);
119 void (*write_cr4)(unsigned long);
122 unsigned long (*read_cr8)(void);
123 void (*write_cr8)(unsigned long);
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);
134 void (*load_gs_index)(unsigned int idx);
136 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
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);
145 void (*load_sp0)(unsigned long sp0);
147 void (*set_iopl_mask)(unsigned mask);
149 void (*wbinvd)(void);
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);
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);
160 * Safe MSR operations.
161 * read sets err to 0 or -EIO. write returns 0 or -EIO.
163 u64 (*read_msr_safe)(unsigned int msr, int *err);
164 int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
166 u64 (*read_pmc)(int counter);
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.
174 void (*usergs_sysret64)(void);
176 /* Normal iret. Jump to this with the standard iret stack
180 void (*swapgs)(void);
182 void (*start_context_switch)(struct task_struct *prev);
183 void (*end_context_switch)(struct task_struct *next);
185 } __no_randomize_layout;
188 #ifdef CONFIG_PARAVIRT_XXL
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
195 * NOTE: These functions callers expect the callee to preserve
196 * more registers than the standard C calling convention.
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;
203 void (*safe_halt)(void);
206 } __no_randomize_layout;
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);
216 void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
218 /* Hook for intercepting the destruction of an mm_struct. */
219 void (*exit_mmap)(struct mm_struct *mm);
221 #ifdef CONFIG_PARAVIRT_XXL
222 unsigned long (*read_cr2)(void);
223 void (*write_cr2)(unsigned long);
225 unsigned long (*read_cr3)(void);
226 void (*write_cr3)(unsigned long);
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);
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);
239 * Hooks for allocating/releasing pagetable pages when they're
240 * attached to a pagetable
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);
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);
257 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
259 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
260 pte_t *ptep, pte_t pte);
262 struct paravirt_callee_save pte_val;
263 struct paravirt_callee_save make_pte;
265 struct paravirt_callee_save pgd_val;
266 struct paravirt_callee_save make_pgd;
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,
273 void (*pmd_clear)(pmd_t *pmdp);
275 #endif /* CONFIG_X86_PAE */
277 void (*set_pud)(pud_t *pudp, pud_t pudval);
279 struct paravirt_callee_save pmd_val;
280 struct paravirt_callee_save make_pmd;
282 #if CONFIG_PGTABLE_LEVELS >= 4
283 struct paravirt_callee_save pud_val;
284 struct paravirt_callee_save make_pud;
286 void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
288 #if CONFIG_PGTABLE_LEVELS >= 5
289 struct paravirt_callee_save p4d_val;
290 struct paravirt_callee_save make_p4d;
292 void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
293 #endif /* CONFIG_PGTABLE_LEVELS >= 5 */
295 #endif /* CONFIG_PGTABLE_LEVELS >= 4 */
297 #endif /* CONFIG_PGTABLE_LEVELS >= 3 */
299 struct pv_lazy_ops lazy_mode;
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);
308 } __no_randomize_layout;
310 struct arch_spinlock;
312 #include <asm/spinlock_types.h>
318 void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
319 struct paravirt_callee_save queued_spin_unlock;
321 void (*wait)(u8 *ptr, u8 val);
322 void (*kick)(int cpu);
324 struct paravirt_callee_save vcpu_is_preempted;
325 } __no_randomize_layout;
327 /* This contains all the paravirt structures: we get a convenient
328 * number for each function using the offset which we use to indicate
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;
339 extern struct pv_info pv_info;
340 extern struct paravirt_patch_template pv_ops;
342 #define PARAVIRT_PATCH(x) \
343 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
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)
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]\";"
357 /* Simple instruction patching code. */
358 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
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))
364 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
365 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
366 unsigned paravirt_patch_default(u8 type, void *insnbuf,
367 unsigned long addr, unsigned len);
369 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
370 const char *start, const char *end);
372 unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len);
374 int paravirt_disable_iospace(void);
377 * These macros are intended to wrap calls through one of the paravirt
378 * ops structs, so that they can be later identified and patched at
381 * Normally, a call to a pv_op function is a simple indirect call:
382 * (pv_op_struct.operations)(args...).
384 * Unfortunately, this is a relatively slow operation for modern CPUs,
385 * because it cannot necessarily determine what the destination
386 * address is. In this case, the address is a runtime constant, so at
387 * the very least we can patch the call to e a simple direct call, or
388 * ideally, patch an inline implementation into the callsite. (Direct
389 * calls are essentially free, because the call and return addresses
390 * are completely predictable.)
392 * For i386, these macros rely on the standard gcc "regparm(3)" calling
393 * convention, in which the first three arguments are placed in %eax,
394 * %edx, %ecx (in that order), and the remaining arguments are placed
395 * on the stack. All caller-save registers (eax,edx,ecx) are expected
396 * to be modified (either clobbered or used for return values).
397 * X86_64, on the other hand, already specifies a register-based calling
398 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
399 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
400 * special handling for dealing with 4 arguments, unlike i386.
401 * However, x86_64 also have to clobber all caller saved registers, which
402 * unfortunately, are quite a bit (r8 - r11)
404 * The call instruction itself is marked by placing its start address
405 * and size into the .parainstructions section, so that
406 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
407 * appropriate patching under the control of the backend pv_init_ops
410 * Unfortunately there's no way to get gcc to generate the args setup
411 * for the call, and then allow the call itself to be generated by an
412 * inline asm. Because of this, we must do the complete arg setup and
413 * return value handling from within these macros. This is fairly
416 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
417 * It could be extended to more arguments, but there would be little
418 * to be gained from that. For each number of arguments, there are
419 * the two VCALL and CALL variants for void and non-void functions.
421 * When there is a return value, the invoker of the macro must specify
422 * the return type. The macro then uses sizeof() on that type to
423 * determine whether its a 32 or 64 bit value, and places the return
424 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
425 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
426 * the return value size.
428 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
429 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
432 * Small structures are passed and returned in registers. The macro
433 * calling convention can't directly deal with this, so the wrapper
434 * functions must do this.
436 * These PVOP_* macros are only defined within this header. This
437 * means that all uses must be wrapped in inline functions. This also
438 * makes sure the incoming and outgoing types are always correct.
441 #define PVOP_VCALL_ARGS \
442 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
444 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
446 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
447 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
448 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
450 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
452 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
454 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
455 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
457 #define EXTRA_CLOBBERS
458 #define VEXTRA_CLOBBERS
459 #else /* CONFIG_X86_64 */
460 /* [re]ax isn't an arg, but the return val */
461 #define PVOP_VCALL_ARGS \
462 unsigned long __edi = __edi, __esi = __esi, \
463 __edx = __edx, __ecx = __ecx, __eax = __eax;
465 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
467 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
468 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
469 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
470 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
472 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
473 "=S" (__esi), "=d" (__edx), \
475 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
477 /* void functions are still allowed [re]ax for scratch */
478 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
479 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
481 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
482 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
483 #endif /* CONFIG_X86_32 */
485 #ifdef CONFIG_PARAVIRT_DEBUG
486 #define PVOP_TEST_NULL(op) BUG_ON(pv_ops.op == NULL)
488 #define PVOP_TEST_NULL(op) ((void)pv_ops.op)
491 #define PVOP_RETMASK(rettype) \
492 ({ unsigned long __mask = ~0UL; \
493 switch (sizeof(rettype)) { \
494 case 1: __mask = 0xffUL; break; \
495 case 2: __mask = 0xffffUL; break; \
496 case 4: __mask = 0xffffffffUL; break; \
503 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
508 PVOP_TEST_NULL(op); \
509 /* This is 32-bit specific, but is okay in 64-bit */ \
510 /* since this condition will never hold */ \
511 if (sizeof(rettype) > sizeof(unsigned long)) { \
515 : call_clbr, ASM_CALL_CONSTRAINT \
516 : paravirt_type(op), \
517 paravirt_clobber(clbr), \
519 : "memory", "cc" extra_clbr); \
520 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
525 : call_clbr, ASM_CALL_CONSTRAINT \
526 : paravirt_type(op), \
527 paravirt_clobber(clbr), \
529 : "memory", "cc" extra_clbr); \
530 __ret = (rettype)(__eax & PVOP_RETMASK(rettype)); \
535 #define __PVOP_CALL(rettype, op, pre, post, ...) \
536 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
537 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
539 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
540 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
541 PVOP_CALLEE_CLOBBERS, , \
542 pre, post, ##__VA_ARGS__)
545 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
548 PVOP_TEST_NULL(op); \
552 : call_clbr, ASM_CALL_CONSTRAINT \
553 : paravirt_type(op), \
554 paravirt_clobber(clbr), \
556 : "memory", "cc" extra_clbr); \
559 #define __PVOP_VCALL(op, pre, post, ...) \
560 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
562 pre, post, ##__VA_ARGS__)
564 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \
565 ____PVOP_VCALL(op.func, CLBR_RET_REG, \
566 PVOP_VCALLEE_CLOBBERS, , \
567 pre, post, ##__VA_ARGS__)
571 #define PVOP_CALL0(rettype, op) \
572 __PVOP_CALL(rettype, op, "", "")
573 #define PVOP_VCALL0(op) \
574 __PVOP_VCALL(op, "", "")
576 #define PVOP_CALLEE0(rettype, op) \
577 __PVOP_CALLEESAVE(rettype, op, "", "")
578 #define PVOP_VCALLEE0(op) \
579 __PVOP_VCALLEESAVE(op, "", "")
582 #define PVOP_CALL1(rettype, op, arg1) \
583 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
584 #define PVOP_VCALL1(op, arg1) \
585 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
587 #define PVOP_CALLEE1(rettype, op, arg1) \
588 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
589 #define PVOP_VCALLEE1(op, arg1) \
590 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
593 #define PVOP_CALL2(rettype, op, arg1, arg2) \
594 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
595 PVOP_CALL_ARG2(arg2))
596 #define PVOP_VCALL2(op, arg1, arg2) \
597 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
598 PVOP_CALL_ARG2(arg2))
600 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \
601 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
602 PVOP_CALL_ARG2(arg2))
603 #define PVOP_VCALLEE2(op, arg1, arg2) \
604 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
605 PVOP_CALL_ARG2(arg2))
608 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
609 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
610 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
611 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
612 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
613 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
615 /* This is the only difference in x86_64. We can make it much simpler */
617 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
618 __PVOP_CALL(rettype, op, \
619 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
620 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
621 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
622 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
624 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
625 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
626 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
628 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
629 __PVOP_CALL(rettype, op, "", "", \
630 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
631 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
632 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
633 __PVOP_VCALL(op, "", "", \
634 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
635 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
638 /* Lazy mode for batching updates / context switch */
639 enum paravirt_lazy_mode {
645 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
646 void paravirt_start_context_switch(struct task_struct *prev);
647 void paravirt_end_context_switch(struct task_struct *next);
649 void paravirt_enter_lazy_mmu(void);
650 void paravirt_leave_lazy_mmu(void);
651 void paravirt_flush_lazy_mmu(void);
653 void _paravirt_nop(void);
654 u32 _paravirt_ident_32(u32);
655 u64 _paravirt_ident_64(u64);
657 #define paravirt_nop ((void *)_paravirt_nop)
659 /* These all sit in the .parainstructions section to tell us what to patch. */
660 struct paravirt_patch_site {
661 u8 *instr; /* original instructions */
662 u8 instrtype; /* type of this instruction */
663 u8 len; /* length of original instruction */
666 extern struct paravirt_patch_site __parainstructions[],
667 __parainstructions_end[];
669 #else /* __ASSEMBLY__ */
672 * This generates an indirect call based on the operation type number.
673 * The type number, computed in PARAVIRT_PATCH, is derived from the
674 * offset into the paravirt_patch_template structure, and can therefore be
675 * freely converted back into a structure offset.
677 .macro PARAVIRT_CALL type:req clobber:req pv_opptr:req
678 771: ANNOTATE_RETPOLINE_SAFE
680 772: .pushsection .parainstructions,"a"
689 #endif /* __ASSEMBLY__ */
691 #endif /* _ASM_X86_PARAVIRT_TYPES_H */