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;
58 struct vm_area_struct;
61 * Wrapper type for pointers to code which uses the non-standard
62 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
64 struct paravirt_callee_save {
70 #ifdef CONFIG_PARAVIRT_XXL
71 u16 extra_user_64bit_cs; /* __USER_CS if none */
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.
86 unsigned (*patch)(u8 type, void *insn_buff,
87 unsigned long addr, unsigned len);
88 } __no_randomize_layout;
90 #ifdef CONFIG_PARAVIRT_XXL
92 /* Set deferred update mode, used for batching operations. */
96 } __no_randomize_layout;
100 unsigned long long (*sched_clock)(void);
101 unsigned long long (*steal_clock)(int cpu);
102 } __no_randomize_layout;
105 /* hooks for various privileged instructions */
106 void (*io_delay)(void);
108 #ifdef CONFIG_PARAVIRT_XXL
109 unsigned long (*get_debugreg)(int regno);
110 void (*set_debugreg)(int regno, unsigned long value);
112 unsigned long (*read_cr0)(void);
113 void (*write_cr0)(unsigned long);
115 void (*write_cr4)(unsigned long);
117 /* Segment descriptor handling */
118 void (*load_tr_desc)(void);
119 void (*load_gdt)(const struct desc_ptr *);
120 void (*load_idt)(const struct desc_ptr *);
121 void (*set_ldt)(const void *desc, unsigned entries);
122 unsigned long (*store_tr)(void);
123 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
124 void (*load_gs_index)(unsigned int idx);
125 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
127 void (*write_gdt_entry)(struct desc_struct *,
128 int entrynum, const void *desc, int size);
129 void (*write_idt_entry)(gate_desc *,
130 int entrynum, const gate_desc *gate);
131 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
132 void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
134 void (*load_sp0)(unsigned long sp0);
136 #ifdef CONFIG_X86_IOPL_IOPERM
137 void (*invalidate_io_bitmap)(void);
138 void (*update_io_bitmap)(void);
141 void (*wbinvd)(void);
143 /* cpuid emulation, mostly so that caps bits can be disabled */
144 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
145 unsigned int *ecx, unsigned int *edx);
147 /* Unsafe MSR operations. These will warn or panic on failure. */
148 u64 (*read_msr)(unsigned int msr);
149 void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
152 * Safe MSR operations.
153 * read sets err to 0 or -EIO. write returns 0 or -EIO.
155 u64 (*read_msr_safe)(unsigned int msr, int *err);
156 int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
158 u64 (*read_pmc)(int counter);
161 * Switch to usermode gs and return to 64-bit usermode using
162 * sysret. Only used in 64-bit kernels to return to 64-bit
163 * processes. Usermode register state, including %rsp, must
164 * already be restored.
166 void (*usergs_sysret64)(void);
168 /* Normal iret. Jump to this with the standard iret stack
172 void (*swapgs)(void);
174 void (*start_context_switch)(struct task_struct *prev);
175 void (*end_context_switch)(struct task_struct *next);
177 } __no_randomize_layout;
180 #ifdef CONFIG_PARAVIRT_XXL
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
187 * NOTE: These functions callers expect the callee to preserve
188 * more registers than the standard C calling convention.
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;
195 void (*safe_halt)(void);
198 } __no_randomize_layout;
202 void (*flush_tlb_user)(void);
203 void (*flush_tlb_kernel)(void);
204 void (*flush_tlb_one_user)(unsigned long addr);
205 void (*flush_tlb_others)(const struct cpumask *cpus,
206 const struct flush_tlb_info *info);
208 void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
210 /* Hook for intercepting the destruction of an mm_struct. */
211 void (*exit_mmap)(struct mm_struct *mm);
213 #ifdef CONFIG_PARAVIRT_XXL
214 struct paravirt_callee_save read_cr2;
215 void (*write_cr2)(unsigned long);
217 unsigned long (*read_cr3)(void);
218 void (*write_cr3)(unsigned long);
220 /* Hooks for intercepting the creation/use of an mm_struct. */
221 void (*activate_mm)(struct mm_struct *prev,
222 struct mm_struct *next);
223 void (*dup_mmap)(struct mm_struct *oldmm,
224 struct mm_struct *mm);
226 /* Hooks for allocating and freeing a pagetable top-level */
227 int (*pgd_alloc)(struct mm_struct *mm);
228 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
231 * Hooks for allocating/releasing pagetable pages when they're
232 * attached to a pagetable
234 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
235 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
236 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
237 void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
238 void (*release_pte)(unsigned long pfn);
239 void (*release_pmd)(unsigned long pfn);
240 void (*release_pud)(unsigned long pfn);
241 void (*release_p4d)(unsigned long pfn);
243 /* Pagetable manipulation functions */
244 void (*set_pte)(pte_t *ptep, pte_t pteval);
245 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
247 pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
249 void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
250 pte_t *ptep, pte_t pte);
252 struct paravirt_callee_save pte_val;
253 struct paravirt_callee_save make_pte;
255 struct paravirt_callee_save pgd_val;
256 struct paravirt_callee_save make_pgd;
258 void (*set_pud)(pud_t *pudp, pud_t pudval);
260 struct paravirt_callee_save pmd_val;
261 struct paravirt_callee_save make_pmd;
263 struct paravirt_callee_save pud_val;
264 struct paravirt_callee_save make_pud;
266 void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
268 #if CONFIG_PGTABLE_LEVELS >= 5
269 struct paravirt_callee_save p4d_val;
270 struct paravirt_callee_save make_p4d;
272 void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
273 #endif /* CONFIG_PGTABLE_LEVELS >= 5 */
275 struct pv_lazy_ops lazy_mode;
279 /* Sometimes the physical address is a pfn, and sometimes its
280 an mfn. We can tell which is which from the index. */
281 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
282 phys_addr_t phys, pgprot_t flags);
284 } __no_randomize_layout;
286 struct arch_spinlock;
288 #include <asm/spinlock_types.h>
294 void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
295 struct paravirt_callee_save queued_spin_unlock;
297 void (*wait)(u8 *ptr, u8 val);
298 void (*kick)(int cpu);
300 struct paravirt_callee_save vcpu_is_preempted;
301 } __no_randomize_layout;
303 /* This contains all the paravirt structures: we get a convenient
304 * number for each function using the offset which we use to indicate
306 struct paravirt_patch_template {
307 struct pv_init_ops init;
308 struct pv_time_ops time;
309 struct pv_cpu_ops cpu;
310 struct pv_irq_ops irq;
311 struct pv_mmu_ops mmu;
312 struct pv_lock_ops lock;
313 } __no_randomize_layout;
315 extern struct pv_info pv_info;
316 extern struct paravirt_patch_template pv_ops;
318 #define PARAVIRT_PATCH(x) \
319 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
321 #define paravirt_type(op) \
322 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
323 [paravirt_opptr] "i" (&(pv_ops.op))
324 #define paravirt_clobber(clobber) \
325 [paravirt_clobber] "i" (clobber)
328 * Generate some code, and mark it as patchable by the
329 * apply_paravirt() alternate instruction patcher.
331 #define _paravirt_alt(insn_string, type, clobber) \
332 "771:\n\t" insn_string "\n" "772:\n" \
333 ".pushsection .parainstructions,\"a\"\n" \
336 " .byte " type "\n" \
337 " .byte 772b-771b\n" \
338 " .short " clobber "\n" \
341 /* Generate patchable code, with the default asm parameters. */
342 #define paravirt_alt(insn_string) \
343 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
345 /* Simple instruction patching code. */
346 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
348 unsigned paravirt_patch_ident_64(void *insn_buff, unsigned len);
349 unsigned paravirt_patch_default(u8 type, void *insn_buff, unsigned long addr, unsigned len);
350 unsigned paravirt_patch_insns(void *insn_buff, unsigned len, const char *start, const char *end);
352 unsigned native_patch(u8 type, void *insn_buff, unsigned long addr, unsigned len);
354 int paravirt_disable_iospace(void);
357 * This generates an indirect call based on the operation type number.
358 * The type number, computed in PARAVIRT_PATCH, is derived from the
359 * offset into the paravirt_patch_template structure, and can therefore be
360 * freely converted back into a structure offset.
362 #define PARAVIRT_CALL \
363 ANNOTATE_RETPOLINE_SAFE \
364 "call *%c[paravirt_opptr];"
367 * These macros are intended to wrap calls through one of the paravirt
368 * ops structs, so that they can be later identified and patched at
371 * Normally, a call to a pv_op function is a simple indirect call:
372 * (pv_op_struct.operations)(args...).
374 * Unfortunately, this is a relatively slow operation for modern CPUs,
375 * because it cannot necessarily determine what the destination
376 * address is. In this case, the address is a runtime constant, so at
377 * the very least we can patch the call to e a simple direct call, or
378 * ideally, patch an inline implementation into the callsite. (Direct
379 * calls are essentially free, because the call and return addresses
380 * are completely predictable.)
382 * For i386, these macros rely on the standard gcc "regparm(3)" calling
383 * convention, in which the first three arguments are placed in %eax,
384 * %edx, %ecx (in that order), and the remaining arguments are placed
385 * on the stack. All caller-save registers (eax,edx,ecx) are expected
386 * to be modified (either clobbered or used for return values).
387 * X86_64, on the other hand, already specifies a register-based calling
388 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
389 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
390 * special handling for dealing with 4 arguments, unlike i386.
391 * However, x86_64 also have to clobber all caller saved registers, which
392 * unfortunately, are quite a bit (r8 - r11)
394 * The call instruction itself is marked by placing its start address
395 * and size into the .parainstructions section, so that
396 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
397 * appropriate patching under the control of the backend pv_init_ops
400 * Unfortunately there's no way to get gcc to generate the args setup
401 * for the call, and then allow the call itself to be generated by an
402 * inline asm. Because of this, we must do the complete arg setup and
403 * return value handling from within these macros. This is fairly
406 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
407 * It could be extended to more arguments, but there would be little
408 * to be gained from that. For each number of arguments, there are
409 * the two VCALL and CALL variants for void and non-void functions.
411 * When there is a return value, the invoker of the macro must specify
412 * the return type. The macro then uses sizeof() on that type to
413 * determine whether its a 32 or 64 bit value, and places the return
414 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
415 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
416 * the return value size.
418 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
419 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
422 * Small structures are passed and returned in registers. The macro
423 * calling convention can't directly deal with this, so the wrapper
424 * functions must do this.
426 * These PVOP_* macros are only defined within this header. This
427 * means that all uses must be wrapped in inline functions. This also
428 * makes sure the incoming and outgoing types are always correct.
431 #define PVOP_VCALL_ARGS \
432 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
434 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
436 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
437 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
438 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
440 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
442 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
444 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
445 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
447 #define EXTRA_CLOBBERS
448 #define VEXTRA_CLOBBERS
449 #else /* CONFIG_X86_64 */
450 /* [re]ax isn't an arg, but the return val */
451 #define PVOP_VCALL_ARGS \
452 unsigned long __edi = __edi, __esi = __esi, \
453 __edx = __edx, __ecx = __ecx, __eax = __eax;
455 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
457 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
458 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
459 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
460 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
462 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
463 "=S" (__esi), "=d" (__edx), \
465 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
467 /* void functions are still allowed [re]ax for scratch */
468 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
469 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
471 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
472 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
473 #endif /* CONFIG_X86_32 */
475 #ifdef CONFIG_PARAVIRT_DEBUG
476 #define PVOP_TEST_NULL(op) BUG_ON(pv_ops.op == NULL)
478 #define PVOP_TEST_NULL(op) ((void)pv_ops.op)
481 #define PVOP_RETMASK(rettype) \
482 ({ unsigned long __mask = ~0UL; \
483 switch (sizeof(rettype)) { \
484 case 1: __mask = 0xffUL; break; \
485 case 2: __mask = 0xffffUL; break; \
486 case 4: __mask = 0xffffffffUL; break; \
493 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
498 PVOP_TEST_NULL(op); \
499 /* This is 32-bit specific, but is okay in 64-bit */ \
500 /* since this condition will never hold */ \
501 if (sizeof(rettype) > sizeof(unsigned long)) { \
503 paravirt_alt(PARAVIRT_CALL) \
505 : call_clbr, ASM_CALL_CONSTRAINT \
506 : paravirt_type(op), \
507 paravirt_clobber(clbr), \
509 : "memory", "cc" extra_clbr); \
510 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
513 paravirt_alt(PARAVIRT_CALL) \
515 : call_clbr, ASM_CALL_CONSTRAINT \
516 : paravirt_type(op), \
517 paravirt_clobber(clbr), \
519 : "memory", "cc" extra_clbr); \
520 __ret = (rettype)(__eax & PVOP_RETMASK(rettype)); \
525 #define __PVOP_CALL(rettype, op, pre, post, ...) \
526 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
527 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
529 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
530 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
531 PVOP_CALLEE_CLOBBERS, , \
532 pre, post, ##__VA_ARGS__)
535 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
538 PVOP_TEST_NULL(op); \
540 paravirt_alt(PARAVIRT_CALL) \
542 : call_clbr, ASM_CALL_CONSTRAINT \
543 : paravirt_type(op), \
544 paravirt_clobber(clbr), \
546 : "memory", "cc" extra_clbr); \
549 #define __PVOP_VCALL(op, pre, post, ...) \
550 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
552 pre, post, ##__VA_ARGS__)
554 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \
555 ____PVOP_VCALL(op.func, CLBR_RET_REG, \
556 PVOP_VCALLEE_CLOBBERS, , \
557 pre, post, ##__VA_ARGS__)
561 #define PVOP_CALL0(rettype, op) \
562 __PVOP_CALL(rettype, op, "", "")
563 #define PVOP_VCALL0(op) \
564 __PVOP_VCALL(op, "", "")
566 #define PVOP_CALLEE0(rettype, op) \
567 __PVOP_CALLEESAVE(rettype, op, "", "")
568 #define PVOP_VCALLEE0(op) \
569 __PVOP_VCALLEESAVE(op, "", "")
572 #define PVOP_CALL1(rettype, op, arg1) \
573 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
574 #define PVOP_VCALL1(op, arg1) \
575 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
577 #define PVOP_CALLEE1(rettype, op, arg1) \
578 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
579 #define PVOP_VCALLEE1(op, arg1) \
580 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
583 #define PVOP_CALL2(rettype, op, arg1, arg2) \
584 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
585 PVOP_CALL_ARG2(arg2))
586 #define PVOP_VCALL2(op, arg1, arg2) \
587 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
588 PVOP_CALL_ARG2(arg2))
590 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \
591 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
592 PVOP_CALL_ARG2(arg2))
593 #define PVOP_VCALLEE2(op, arg1, arg2) \
594 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
595 PVOP_CALL_ARG2(arg2))
598 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
599 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
600 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
601 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
602 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
603 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
605 /* This is the only difference in x86_64. We can make it much simpler */
607 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
608 __PVOP_CALL(rettype, op, \
609 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
610 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
611 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
612 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
614 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
615 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
616 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
618 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
619 __PVOP_CALL(rettype, op, "", "", \
620 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
621 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
622 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
623 __PVOP_VCALL(op, "", "", \
624 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
625 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
628 /* Lazy mode for batching updates / context switch */
629 enum paravirt_lazy_mode {
635 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
636 void paravirt_start_context_switch(struct task_struct *prev);
637 void paravirt_end_context_switch(struct task_struct *next);
639 void paravirt_enter_lazy_mmu(void);
640 void paravirt_leave_lazy_mmu(void);
641 void paravirt_flush_lazy_mmu(void);
643 void _paravirt_nop(void);
644 u64 _paravirt_ident_64(u64);
646 #define paravirt_nop ((void *)_paravirt_nop)
648 /* These all sit in the .parainstructions section to tell us what to patch. */
649 struct paravirt_patch_site {
650 u8 *instr; /* original instructions */
651 u8 type; /* type of this instruction */
652 u8 len; /* length of original instruction */
655 extern struct paravirt_patch_site __parainstructions[],
656 __parainstructions_end[];
658 #endif /* __ASSEMBLY__ */
660 #endif /* _ASM_X86_PARAVIRT_TYPES_H */