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_EAX  (1 << 0)
7 #define CLBR_ECX  (1 << 1)
8 #define CLBR_EDX  (1 << 2)
9 #define CLBR_EDI  (1 << 3)
10 
11 #ifdef CONFIG_X86_32
12 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
13 #define CLBR_ANY  ((1 << 4) - 1)
14 
15 #define CLBR_ARG_REGS	(CLBR_EAX | CLBR_EDX | CLBR_ECX)
16 #define CLBR_RET_REG	(CLBR_EAX | CLBR_EDX)
17 #else
18 #define CLBR_RAX  CLBR_EAX
19 #define CLBR_RCX  CLBR_ECX
20 #define CLBR_RDX  CLBR_EDX
21 #define CLBR_RDI  CLBR_EDI
22 #define CLBR_RSI  (1 << 4)
23 #define CLBR_R8   (1 << 5)
24 #define CLBR_R9   (1 << 6)
25 #define CLBR_R10  (1 << 7)
26 #define CLBR_R11  (1 << 8)
27 
28 #define CLBR_ANY  ((1 << 9) - 1)
29 
30 #define CLBR_ARG_REGS	(CLBR_RDI | CLBR_RSI | CLBR_RDX | \
31 			 CLBR_RCX | CLBR_R8 | CLBR_R9)
32 #define CLBR_RET_REG	(CLBR_RAX)
33 
34 #endif /* X86_64 */
35 
36 #ifndef __ASSEMBLY__
37 
38 #include <asm/desc_defs.h>
39 #include <asm/pgtable_types.h>
40 #include <asm/nospec-branch.h>
41 
42 struct page;
43 struct thread_struct;
44 struct desc_ptr;
45 struct tss_struct;
46 struct mm_struct;
47 struct desc_struct;
48 struct task_struct;
49 struct cpumask;
50 struct flush_tlb_info;
51 struct mmu_gather;
52 struct vm_area_struct;
53 
54 /*
55  * Wrapper type for pointers to code which uses the non-standard
56  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
57  */
58 struct paravirt_callee_save {
59 	void *func;
60 };
61 
62 /* general info */
63 struct pv_info {
64 #ifdef CONFIG_PARAVIRT_XXL
65 	u16 extra_user_64bit_cs;  /* __USER_CS if none */
66 #endif
67 
68 	const char *name;
69 };
70 
71 #ifdef CONFIG_PARAVIRT_XXL
72 struct pv_lazy_ops {
73 	/* Set deferred update mode, used for batching operations. */
74 	void (*enter)(void);
75 	void (*leave)(void);
76 	void (*flush)(void);
77 } __no_randomize_layout;
78 #endif
79 
80 struct pv_cpu_ops {
81 	/* hooks for various privileged instructions */
82 	void (*io_delay)(void);
83 
84 #ifdef CONFIG_PARAVIRT_XXL
85 	unsigned long (*get_debugreg)(int regno);
86 	void (*set_debugreg)(int regno, unsigned long value);
87 
88 	unsigned long (*read_cr0)(void);
89 	void (*write_cr0)(unsigned long);
90 
91 	void (*write_cr4)(unsigned long);
92 
93 	/* Segment descriptor handling */
94 	void (*load_tr_desc)(void);
95 	void (*load_gdt)(const struct desc_ptr *);
96 	void (*load_idt)(const struct desc_ptr *);
97 	void (*set_ldt)(const void *desc, unsigned entries);
98 	unsigned long (*store_tr)(void);
99 	void (*load_tls)(struct thread_struct *t, unsigned int cpu);
100 	void (*load_gs_index)(unsigned int idx);
101 	void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
102 				const void *desc);
103 	void (*write_gdt_entry)(struct desc_struct *,
104 				int entrynum, const void *desc, int size);
105 	void (*write_idt_entry)(gate_desc *,
106 				int entrynum, const gate_desc *gate);
107 	void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
108 	void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
109 
110 	void (*load_sp0)(unsigned long sp0);
111 
112 #ifdef CONFIG_X86_IOPL_IOPERM
113 	void (*invalidate_io_bitmap)(void);
114 	void (*update_io_bitmap)(void);
115 #endif
116 
117 	void (*wbinvd)(void);
118 
119 	/* cpuid emulation, mostly so that caps bits can be disabled */
120 	void (*cpuid)(unsigned int *eax, unsigned int *ebx,
121 		      unsigned int *ecx, unsigned int *edx);
122 
123 	/* Unsafe MSR operations.  These will warn or panic on failure. */
124 	u64 (*read_msr)(unsigned int msr);
125 	void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
126 
127 	/*
128 	 * Safe MSR operations.
129 	 * read sets err to 0 or -EIO.  write returns 0 or -EIO.
130 	 */
131 	u64 (*read_msr_safe)(unsigned int msr, int *err);
132 	int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
133 
134 	u64 (*read_pmc)(int counter);
135 
136 	void (*start_context_switch)(struct task_struct *prev);
137 	void (*end_context_switch)(struct task_struct *next);
138 #endif
139 } __no_randomize_layout;
140 
141 struct pv_irq_ops {
142 #ifdef CONFIG_PARAVIRT_XXL
143 	/*
144 	 * Get/set interrupt state.  save_fl is expected to use X86_EFLAGS_IF;
145 	 * all other bits returned from save_fl are undefined.
146 	 *
147 	 * NOTE: These functions callers expect the callee to preserve
148 	 * more registers than the standard C calling convention.
149 	 */
150 	struct paravirt_callee_save save_fl;
151 	struct paravirt_callee_save irq_disable;
152 	struct paravirt_callee_save irq_enable;
153 
154 	void (*safe_halt)(void);
155 	void (*halt)(void);
156 #endif
157 } __no_randomize_layout;
158 
159 struct pv_mmu_ops {
160 	/* TLB operations */
161 	void (*flush_tlb_user)(void);
162 	void (*flush_tlb_kernel)(void);
163 	void (*flush_tlb_one_user)(unsigned long addr);
164 	void (*flush_tlb_multi)(const struct cpumask *cpus,
165 				const struct flush_tlb_info *info);
166 
167 	void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
168 
169 	/* Hook for intercepting the destruction of an mm_struct. */
170 	void (*exit_mmap)(struct mm_struct *mm);
171 	void (*notify_page_enc_status_changed)(unsigned long pfn, int npages, bool enc);
172 
173 #ifdef CONFIG_PARAVIRT_XXL
174 	struct paravirt_callee_save read_cr2;
175 	void (*write_cr2)(unsigned long);
176 
177 	unsigned long (*read_cr3)(void);
178 	void (*write_cr3)(unsigned long);
179 
180 	/* Hooks for intercepting the creation/use of an mm_struct. */
181 	void (*activate_mm)(struct mm_struct *prev,
182 			    struct mm_struct *next);
183 	void (*dup_mmap)(struct mm_struct *oldmm,
184 			 struct mm_struct *mm);
185 
186 	/* Hooks for allocating and freeing a pagetable top-level */
187 	int  (*pgd_alloc)(struct mm_struct *mm);
188 	void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
189 
190 	/*
191 	 * Hooks for allocating/releasing pagetable pages when they're
192 	 * attached to a pagetable
193 	 */
194 	void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
195 	void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
196 	void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
197 	void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
198 	void (*release_pte)(unsigned long pfn);
199 	void (*release_pmd)(unsigned long pfn);
200 	void (*release_pud)(unsigned long pfn);
201 	void (*release_p4d)(unsigned long pfn);
202 
203 	/* Pagetable manipulation functions */
204 	void (*set_pte)(pte_t *ptep, pte_t pteval);
205 	void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
206 
207 	pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
208 					pte_t *ptep);
209 	void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
210 					pte_t *ptep, pte_t pte);
211 
212 	struct paravirt_callee_save pte_val;
213 	struct paravirt_callee_save make_pte;
214 
215 	struct paravirt_callee_save pgd_val;
216 	struct paravirt_callee_save make_pgd;
217 
218 	void (*set_pud)(pud_t *pudp, pud_t pudval);
219 
220 	struct paravirt_callee_save pmd_val;
221 	struct paravirt_callee_save make_pmd;
222 
223 	struct paravirt_callee_save pud_val;
224 	struct paravirt_callee_save make_pud;
225 
226 	void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
227 
228 #if CONFIG_PGTABLE_LEVELS >= 5
229 	struct paravirt_callee_save p4d_val;
230 	struct paravirt_callee_save make_p4d;
231 
232 	void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
233 #endif	/* CONFIG_PGTABLE_LEVELS >= 5 */
234 
235 	struct pv_lazy_ops lazy_mode;
236 
237 	/* dom0 ops */
238 
239 	/* Sometimes the physical address is a pfn, and sometimes its
240 	   an mfn.  We can tell which is which from the index. */
241 	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
242 			   phys_addr_t phys, pgprot_t flags);
243 #endif
244 } __no_randomize_layout;
245 
246 struct arch_spinlock;
247 #ifdef CONFIG_SMP
248 #include <asm/spinlock_types.h>
249 #endif
250 
251 struct qspinlock;
252 
253 struct pv_lock_ops {
254 	void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
255 	struct paravirt_callee_save queued_spin_unlock;
256 
257 	void (*wait)(u8 *ptr, u8 val);
258 	void (*kick)(int cpu);
259 
260 	struct paravirt_callee_save vcpu_is_preempted;
261 } __no_randomize_layout;
262 
263 /* This contains all the paravirt structures: we get a convenient
264  * number for each function using the offset which we use to indicate
265  * what to patch. */
266 struct paravirt_patch_template {
267 	struct pv_cpu_ops	cpu;
268 	struct pv_irq_ops	irq;
269 	struct pv_mmu_ops	mmu;
270 	struct pv_lock_ops	lock;
271 } __no_randomize_layout;
272 
273 extern struct pv_info pv_info;
274 extern struct paravirt_patch_template pv_ops;
275 
276 #define PARAVIRT_PATCH(x)					\
277 	(offsetof(struct paravirt_patch_template, x) / sizeof(void *))
278 
279 #define paravirt_type(op)				\
280 	[paravirt_typenum] "i" (PARAVIRT_PATCH(op)),	\
281 	[paravirt_opptr] "m" (pv_ops.op)
282 #define paravirt_clobber(clobber)		\
283 	[paravirt_clobber] "i" (clobber)
284 
285 /*
286  * Generate some code, and mark it as patchable by the
287  * apply_paravirt() alternate instruction patcher.
288  */
289 #define _paravirt_alt(insn_string, type, clobber)	\
290 	"771:\n\t" insn_string "\n" "772:\n"		\
291 	".pushsection .parainstructions,\"a\"\n"	\
292 	_ASM_ALIGN "\n"					\
293 	_ASM_PTR " 771b\n"				\
294 	"  .byte " type "\n"				\
295 	"  .byte 772b-771b\n"				\
296 	"  .short " clobber "\n"			\
297 	".popsection\n"
298 
299 /* Generate patchable code, with the default asm parameters. */
300 #define paravirt_alt(insn_string)					\
301 	_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
302 
303 /* Simple instruction patching code. */
304 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
305 
306 unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int len);
307 
308 int paravirt_disable_iospace(void);
309 
310 /*
311  * This generates an indirect call based on the operation type number.
312  * The type number, computed in PARAVIRT_PATCH, is derived from the
313  * offset into the paravirt_patch_template structure, and can therefore be
314  * freely converted back into a structure offset.
315  */
316 #define PARAVIRT_CALL					\
317 	ANNOTATE_RETPOLINE_SAFE				\
318 	"call *%[paravirt_opptr];"
319 
320 /*
321  * These macros are intended to wrap calls through one of the paravirt
322  * ops structs, so that they can be later identified and patched at
323  * runtime.
324  *
325  * Normally, a call to a pv_op function is a simple indirect call:
326  * (pv_op_struct.operations)(args...).
327  *
328  * Unfortunately, this is a relatively slow operation for modern CPUs,
329  * because it cannot necessarily determine what the destination
330  * address is.  In this case, the address is a runtime constant, so at
331  * the very least we can patch the call to e a simple direct call, or
332  * ideally, patch an inline implementation into the callsite.  (Direct
333  * calls are essentially free, because the call and return addresses
334  * are completely predictable.)
335  *
336  * For i386, these macros rely on the standard gcc "regparm(3)" calling
337  * convention, in which the first three arguments are placed in %eax,
338  * %edx, %ecx (in that order), and the remaining arguments are placed
339  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
340  * to be modified (either clobbered or used for return values).
341  * X86_64, on the other hand, already specifies a register-based calling
342  * conventions, returning at %rax, with parameters going on %rdi, %rsi,
343  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
344  * special handling for dealing with 4 arguments, unlike i386.
345  * However, x86_64 also have to clobber all caller saved registers, which
346  * unfortunately, are quite a bit (r8 - r11)
347  *
348  * The call instruction itself is marked by placing its start address
349  * and size into the .parainstructions section, so that
350  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
351  * appropriate patching under the control of the backend pv_init_ops
352  * implementation.
353  *
354  * Unfortunately there's no way to get gcc to generate the args setup
355  * for the call, and then allow the call itself to be generated by an
356  * inline asm.  Because of this, we must do the complete arg setup and
357  * return value handling from within these macros.  This is fairly
358  * cumbersome.
359  *
360  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
361  * It could be extended to more arguments, but there would be little
362  * to be gained from that.  For each number of arguments, there are
363  * the two VCALL and CALL variants for void and non-void functions.
364  *
365  * When there is a return value, the invoker of the macro must specify
366  * the return type.  The macro then uses sizeof() on that type to
367  * determine whether its a 32 or 64 bit value, and places the return
368  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
369  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
370  * the return value size.
371  *
372  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
373  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
374  * in low,high order
375  *
376  * Small structures are passed and returned in registers.  The macro
377  * calling convention can't directly deal with this, so the wrapper
378  * functions must do this.
379  *
380  * These PVOP_* macros are only defined within this header.  This
381  * means that all uses must be wrapped in inline functions.  This also
382  * makes sure the incoming and outgoing types are always correct.
383  */
384 #ifdef CONFIG_X86_32
385 #define PVOP_CALL_ARGS							\
386 	unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
387 
388 #define PVOP_CALL_ARG1(x)		"a" ((unsigned long)(x))
389 #define PVOP_CALL_ARG2(x)		"d" ((unsigned long)(x))
390 #define PVOP_CALL_ARG3(x)		"c" ((unsigned long)(x))
391 
392 #define PVOP_VCALL_CLOBBERS		"=a" (__eax), "=d" (__edx),	\
393 					"=c" (__ecx)
394 #define PVOP_CALL_CLOBBERS		PVOP_VCALL_CLOBBERS
395 
396 #define PVOP_VCALLEE_CLOBBERS		"=a" (__eax), "=d" (__edx)
397 #define PVOP_CALLEE_CLOBBERS		PVOP_VCALLEE_CLOBBERS
398 
399 #define EXTRA_CLOBBERS
400 #define VEXTRA_CLOBBERS
401 #else  /* CONFIG_X86_64 */
402 /* [re]ax isn't an arg, but the return val */
403 #define PVOP_CALL_ARGS						\
404 	unsigned long __edi = __edi, __esi = __esi,		\
405 		__edx = __edx, __ecx = __ecx, __eax = __eax;
406 
407 #define PVOP_CALL_ARG1(x)		"D" ((unsigned long)(x))
408 #define PVOP_CALL_ARG2(x)		"S" ((unsigned long)(x))
409 #define PVOP_CALL_ARG3(x)		"d" ((unsigned long)(x))
410 #define PVOP_CALL_ARG4(x)		"c" ((unsigned long)(x))
411 
412 #define PVOP_VCALL_CLOBBERS	"=D" (__edi),				\
413 				"=S" (__esi), "=d" (__edx),		\
414 				"=c" (__ecx)
415 #define PVOP_CALL_CLOBBERS	PVOP_VCALL_CLOBBERS, "=a" (__eax)
416 
417 /* void functions are still allowed [re]ax for scratch */
418 #define PVOP_VCALLEE_CLOBBERS	"=a" (__eax)
419 #define PVOP_CALLEE_CLOBBERS	PVOP_VCALLEE_CLOBBERS
420 
421 #define EXTRA_CLOBBERS	 , "r8", "r9", "r10", "r11"
422 #define VEXTRA_CLOBBERS	 , "rax", "r8", "r9", "r10", "r11"
423 #endif	/* CONFIG_X86_32 */
424 
425 #ifdef CONFIG_PARAVIRT_DEBUG
426 #define PVOP_TEST_NULL(op)	BUG_ON(pv_ops.op == NULL)
427 #else
428 #define PVOP_TEST_NULL(op)	((void)pv_ops.op)
429 #endif
430 
431 #define PVOP_RETVAL(rettype)						\
432 	({	unsigned long __mask = ~0UL;				\
433 		BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long));	\
434 		switch (sizeof(rettype)) {				\
435 		case 1: __mask =       0xffUL; break;			\
436 		case 2: __mask =     0xffffUL; break;			\
437 		case 4: __mask = 0xffffffffUL; break;			\
438 		default: break;						\
439 		}							\
440 		__mask & __eax;						\
441 	})
442 
443 
444 #define ____PVOP_CALL(ret, op, clbr, call_clbr, extra_clbr, ...)	\
445 	({								\
446 		PVOP_CALL_ARGS;						\
447 		PVOP_TEST_NULL(op);					\
448 		asm volatile(paravirt_alt(PARAVIRT_CALL)		\
449 			     : call_clbr, ASM_CALL_CONSTRAINT		\
450 			     : paravirt_type(op),			\
451 			       paravirt_clobber(clbr),			\
452 			       ##__VA_ARGS__				\
453 			     : "memory", "cc" extra_clbr);		\
454 		ret;							\
455 	})
456 
457 #define ____PVOP_ALT_CALL(ret, op, alt, cond, clbr, call_clbr,		\
458 			  extra_clbr, ...)				\
459 	({								\
460 		PVOP_CALL_ARGS;						\
461 		PVOP_TEST_NULL(op);					\
462 		asm volatile(ALTERNATIVE(paravirt_alt(PARAVIRT_CALL),	\
463 					 alt, cond)			\
464 			     : call_clbr, ASM_CALL_CONSTRAINT		\
465 			     : paravirt_type(op),			\
466 			       paravirt_clobber(clbr),			\
467 			       ##__VA_ARGS__				\
468 			     : "memory", "cc" extra_clbr);		\
469 		ret;							\
470 	})
471 
472 #define __PVOP_CALL(rettype, op, ...)					\
473 	____PVOP_CALL(PVOP_RETVAL(rettype), op, CLBR_ANY,		\
474 		      PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS, ##__VA_ARGS__)
475 
476 #define __PVOP_ALT_CALL(rettype, op, alt, cond, ...)			\
477 	____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op, alt, cond, CLBR_ANY,\
478 			  PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS,		\
479 			  ##__VA_ARGS__)
480 
481 #define __PVOP_CALLEESAVE(rettype, op, ...)				\
482 	____PVOP_CALL(PVOP_RETVAL(rettype), op.func, CLBR_RET_REG,	\
483 		      PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
484 
485 #define __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, ...)		\
486 	____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op.func, alt, cond,	\
487 			  CLBR_RET_REG, PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
488 
489 
490 #define __PVOP_VCALL(op, ...)						\
491 	(void)____PVOP_CALL(, op, CLBR_ANY, PVOP_VCALL_CLOBBERS,	\
492 		       VEXTRA_CLOBBERS, ##__VA_ARGS__)
493 
494 #define __PVOP_ALT_VCALL(op, alt, cond, ...)				\
495 	(void)____PVOP_ALT_CALL(, op, alt, cond, CLBR_ANY,		\
496 				PVOP_VCALL_CLOBBERS, VEXTRA_CLOBBERS,	\
497 				##__VA_ARGS__)
498 
499 #define __PVOP_VCALLEESAVE(op, ...)					\
500 	(void)____PVOP_CALL(, op.func, CLBR_RET_REG,			\
501 			    PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
502 
503 #define __PVOP_ALT_VCALLEESAVE(op, alt, cond, ...)			\
504 	(void)____PVOP_ALT_CALL(, op.func, alt, cond, CLBR_RET_REG,	\
505 				PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
506 
507 
508 #define PVOP_CALL0(rettype, op)						\
509 	__PVOP_CALL(rettype, op)
510 #define PVOP_VCALL0(op)							\
511 	__PVOP_VCALL(op)
512 #define PVOP_ALT_CALL0(rettype, op, alt, cond)				\
513 	__PVOP_ALT_CALL(rettype, op, alt, cond)
514 #define PVOP_ALT_VCALL0(op, alt, cond)					\
515 	__PVOP_ALT_VCALL(op, alt, cond)
516 
517 #define PVOP_CALLEE0(rettype, op)					\
518 	__PVOP_CALLEESAVE(rettype, op)
519 #define PVOP_VCALLEE0(op)						\
520 	__PVOP_VCALLEESAVE(op)
521 #define PVOP_ALT_CALLEE0(rettype, op, alt, cond)			\
522 	__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond)
523 #define PVOP_ALT_VCALLEE0(op, alt, cond)				\
524 	__PVOP_ALT_VCALLEESAVE(op, alt, cond)
525 
526 
527 #define PVOP_CALL1(rettype, op, arg1)					\
528 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1))
529 #define PVOP_VCALL1(op, arg1)						\
530 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1))
531 #define PVOP_ALT_VCALL1(op, arg1, alt, cond)				\
532 	__PVOP_ALT_VCALL(op, alt, cond, PVOP_CALL_ARG1(arg1))
533 
534 #define PVOP_CALLEE1(rettype, op, arg1)					\
535 	__PVOP_CALLEESAVE(rettype, op, PVOP_CALL_ARG1(arg1))
536 #define PVOP_VCALLEE1(op, arg1)						\
537 	__PVOP_VCALLEESAVE(op, PVOP_CALL_ARG1(arg1))
538 #define PVOP_ALT_CALLEE1(rettype, op, arg1, alt, cond)			\
539 	__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, PVOP_CALL_ARG1(arg1))
540 #define PVOP_ALT_VCALLEE1(op, arg1, alt, cond)				\
541 	__PVOP_ALT_VCALLEESAVE(op, alt, cond, PVOP_CALL_ARG1(arg1))
542 
543 
544 #define PVOP_CALL2(rettype, op, arg1, arg2)				\
545 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
546 #define PVOP_VCALL2(op, arg1, arg2)					\
547 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
548 
549 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)			\
550 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1),			\
551 		    PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
552 #define PVOP_VCALL3(op, arg1, arg2, arg3)				\
553 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1),				\
554 		     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
555 
556 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)			\
557 	__PVOP_CALL(rettype, op,					\
558 		    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),		\
559 		    PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
560 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)				\
561 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),	\
562 		     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
563 
564 /* Lazy mode for batching updates / context switch */
565 enum paravirt_lazy_mode {
566 	PARAVIRT_LAZY_NONE,
567 	PARAVIRT_LAZY_MMU,
568 	PARAVIRT_LAZY_CPU,
569 };
570 
571 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
572 void paravirt_start_context_switch(struct task_struct *prev);
573 void paravirt_end_context_switch(struct task_struct *next);
574 
575 void paravirt_enter_lazy_mmu(void);
576 void paravirt_leave_lazy_mmu(void);
577 void paravirt_flush_lazy_mmu(void);
578 
579 void _paravirt_nop(void);
580 void paravirt_BUG(void);
581 u64 _paravirt_ident_64(u64);
582 unsigned long paravirt_ret0(void);
583 
584 #define paravirt_nop	((void *)_paravirt_nop)
585 
586 /* These all sit in the .parainstructions section to tell us what to patch. */
587 struct paravirt_patch_site {
588 	u8 *instr;		/* original instructions */
589 	u8 type;		/* type of this instruction */
590 	u8 len;			/* length of original instruction */
591 };
592 
593 extern struct paravirt_patch_site __parainstructions[],
594 	__parainstructions_end[];
595 
596 #endif	/* __ASSEMBLY__ */
597 
598 #endif	/* _ASM_X86_PARAVIRT_TYPES_H */
599