xref: /openbmc/linux/arch/x86/include/asm/paravirt.h (revision 68198dca) 
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PARAVIRT_H
3 #define _ASM_X86_PARAVIRT_H
4 /* Various instructions on x86 need to be replaced for
5  * para-virtualization: those hooks are defined here. */
6 
7 #ifdef CONFIG_PARAVIRT
8 #include <asm/pgtable_types.h>
9 #include <asm/asm.h>
10 
11 #include <asm/paravirt_types.h>
12 
13 #ifndef __ASSEMBLY__
14 #include <linux/bug.h>
15 #include <linux/types.h>
16 #include <linux/cpumask.h>
17 #include <asm/frame.h>
18 
19 static inline void load_sp0(unsigned long sp0)
20 {
21 	PVOP_VCALL1(pv_cpu_ops.load_sp0, sp0);
22 }
23 
24 /* The paravirtualized CPUID instruction. */
25 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
26 			   unsigned int *ecx, unsigned int *edx)
27 {
28 	PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
29 }
30 
31 /*
32  * These special macros can be used to get or set a debugging register
33  */
34 static inline unsigned long paravirt_get_debugreg(int reg)
35 {
36 	return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
37 }
38 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
39 static inline void set_debugreg(unsigned long val, int reg)
40 {
41 	PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
42 }
43 
44 static inline unsigned long read_cr0(void)
45 {
46 	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
47 }
48 
49 static inline void write_cr0(unsigned long x)
50 {
51 	PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
52 }
53 
54 static inline unsigned long read_cr2(void)
55 {
56 	return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
57 }
58 
59 static inline void write_cr2(unsigned long x)
60 {
61 	PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
62 }
63 
64 static inline unsigned long __read_cr3(void)
65 {
66 	return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
67 }
68 
69 static inline void write_cr3(unsigned long x)
70 {
71 	PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
72 }
73 
74 static inline void __write_cr4(unsigned long x)
75 {
76 	PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
77 }
78 
79 #ifdef CONFIG_X86_64
80 static inline unsigned long read_cr8(void)
81 {
82 	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
83 }
84 
85 static inline void write_cr8(unsigned long x)
86 {
87 	PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
88 }
89 #endif
90 
91 static inline void arch_safe_halt(void)
92 {
93 	PVOP_VCALL0(pv_irq_ops.safe_halt);
94 }
95 
96 static inline void halt(void)
97 {
98 	PVOP_VCALL0(pv_irq_ops.halt);
99 }
100 
101 static inline void wbinvd(void)
102 {
103 	PVOP_VCALL0(pv_cpu_ops.wbinvd);
104 }
105 
106 #define get_kernel_rpl()  (pv_info.kernel_rpl)
107 
108 static inline u64 paravirt_read_msr(unsigned msr)
109 {
110 	return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr);
111 }
112 
113 static inline void paravirt_write_msr(unsigned msr,
114 				      unsigned low, unsigned high)
115 {
116 	PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high);
117 }
118 
119 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
120 {
121 	return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err);
122 }
123 
124 static inline int paravirt_write_msr_safe(unsigned msr,
125 					  unsigned low, unsigned high)
126 {
127 	return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high);
128 }
129 
130 #define rdmsr(msr, val1, val2)			\
131 do {						\
132 	u64 _l = paravirt_read_msr(msr);	\
133 	val1 = (u32)_l;				\
134 	val2 = _l >> 32;			\
135 } while (0)
136 
137 #define wrmsr(msr, val1, val2)			\
138 do {						\
139 	paravirt_write_msr(msr, val1, val2);	\
140 } while (0)
141 
142 #define rdmsrl(msr, val)			\
143 do {						\
144 	val = paravirt_read_msr(msr);		\
145 } while (0)
146 
147 static inline void wrmsrl(unsigned msr, u64 val)
148 {
149 	wrmsr(msr, (u32)val, (u32)(val>>32));
150 }
151 
152 #define wrmsr_safe(msr, a, b)	paravirt_write_msr_safe(msr, a, b)
153 
154 /* rdmsr with exception handling */
155 #define rdmsr_safe(msr, a, b)				\
156 ({							\
157 	int _err;					\
158 	u64 _l = paravirt_read_msr_safe(msr, &_err);	\
159 	(*a) = (u32)_l;					\
160 	(*b) = _l >> 32;				\
161 	_err;						\
162 })
163 
164 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
165 {
166 	int err;
167 
168 	*p = paravirt_read_msr_safe(msr, &err);
169 	return err;
170 }
171 
172 static inline unsigned long long paravirt_sched_clock(void)
173 {
174 	return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
175 }
176 
177 struct static_key;
178 extern struct static_key paravirt_steal_enabled;
179 extern struct static_key paravirt_steal_rq_enabled;
180 
181 static inline u64 paravirt_steal_clock(int cpu)
182 {
183 	return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
184 }
185 
186 static inline unsigned long long paravirt_read_pmc(int counter)
187 {
188 	return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
189 }
190 
191 #define rdpmc(counter, low, high)		\
192 do {						\
193 	u64 _l = paravirt_read_pmc(counter);	\
194 	low = (u32)_l;				\
195 	high = _l >> 32;			\
196 } while (0)
197 
198 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
199 
200 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
201 {
202 	PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
203 }
204 
205 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
206 {
207 	PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
208 }
209 
210 static inline void load_TR_desc(void)
211 {
212 	PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
213 }
214 static inline void load_gdt(const struct desc_ptr *dtr)
215 {
216 	PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
217 }
218 static inline void load_idt(const struct desc_ptr *dtr)
219 {
220 	PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
221 }
222 static inline void set_ldt(const void *addr, unsigned entries)
223 {
224 	PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
225 }
226 static inline unsigned long paravirt_store_tr(void)
227 {
228 	return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
229 }
230 #define store_tr(tr)	((tr) = paravirt_store_tr())
231 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
232 {
233 	PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
234 }
235 
236 #ifdef CONFIG_X86_64
237 static inline void load_gs_index(unsigned int gs)
238 {
239 	PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
240 }
241 #endif
242 
243 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
244 				   const void *desc)
245 {
246 	PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
247 }
248 
249 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
250 				   void *desc, int type)
251 {
252 	PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
253 }
254 
255 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
256 {
257 	PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
258 }
259 static inline void set_iopl_mask(unsigned mask)
260 {
261 	PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
262 }
263 
264 /* The paravirtualized I/O functions */
265 static inline void slow_down_io(void)
266 {
267 	pv_cpu_ops.io_delay();
268 #ifdef REALLY_SLOW_IO
269 	pv_cpu_ops.io_delay();
270 	pv_cpu_ops.io_delay();
271 	pv_cpu_ops.io_delay();
272 #endif
273 }
274 
275 static inline void paravirt_activate_mm(struct mm_struct *prev,
276 					struct mm_struct *next)
277 {
278 	PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
279 }
280 
281 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
282 					  struct mm_struct *mm)
283 {
284 	PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
285 }
286 
287 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
288 {
289 	PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
290 }
291 
292 static inline void __flush_tlb(void)
293 {
294 	PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
295 }
296 static inline void __flush_tlb_global(void)
297 {
298 	PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
299 }
300 static inline void __flush_tlb_single(unsigned long addr)
301 {
302 	PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
303 }
304 
305 static inline void flush_tlb_others(const struct cpumask *cpumask,
306 				    const struct flush_tlb_info *info)
307 {
308 	PVOP_VCALL2(pv_mmu_ops.flush_tlb_others, cpumask, info);
309 }
310 
311 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
312 {
313 	return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
314 }
315 
316 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
317 {
318 	PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
319 }
320 
321 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
322 {
323 	PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
324 }
325 static inline void paravirt_release_pte(unsigned long pfn)
326 {
327 	PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
328 }
329 
330 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
331 {
332 	PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
333 }
334 
335 static inline void paravirt_release_pmd(unsigned long pfn)
336 {
337 	PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
338 }
339 
340 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
341 {
342 	PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
343 }
344 static inline void paravirt_release_pud(unsigned long pfn)
345 {
346 	PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
347 }
348 
349 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
350 {
351 	PVOP_VCALL2(pv_mmu_ops.alloc_p4d, mm, pfn);
352 }
353 
354 static inline void paravirt_release_p4d(unsigned long pfn)
355 {
356 	PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn);
357 }
358 
359 static inline pte_t __pte(pteval_t val)
360 {
361 	pteval_t ret;
362 
363 	if (sizeof(pteval_t) > sizeof(long))
364 		ret = PVOP_CALLEE2(pteval_t,
365 				   pv_mmu_ops.make_pte,
366 				   val, (u64)val >> 32);
367 	else
368 		ret = PVOP_CALLEE1(pteval_t,
369 				   pv_mmu_ops.make_pte,
370 				   val);
371 
372 	return (pte_t) { .pte = ret };
373 }
374 
375 static inline pteval_t pte_val(pte_t pte)
376 {
377 	pteval_t ret;
378 
379 	if (sizeof(pteval_t) > sizeof(long))
380 		ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
381 				   pte.pte, (u64)pte.pte >> 32);
382 	else
383 		ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
384 				   pte.pte);
385 
386 	return ret;
387 }
388 
389 static inline pgd_t __pgd(pgdval_t val)
390 {
391 	pgdval_t ret;
392 
393 	if (sizeof(pgdval_t) > sizeof(long))
394 		ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
395 				   val, (u64)val >> 32);
396 	else
397 		ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
398 				   val);
399 
400 	return (pgd_t) { ret };
401 }
402 
403 static inline pgdval_t pgd_val(pgd_t pgd)
404 {
405 	pgdval_t ret;
406 
407 	if (sizeof(pgdval_t) > sizeof(long))
408 		ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
409 				    pgd.pgd, (u64)pgd.pgd >> 32);
410 	else
411 		ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
412 				    pgd.pgd);
413 
414 	return ret;
415 }
416 
417 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
418 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
419 					   pte_t *ptep)
420 {
421 	pteval_t ret;
422 
423 	ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
424 			 mm, addr, ptep);
425 
426 	return (pte_t) { .pte = ret };
427 }
428 
429 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
430 					   pte_t *ptep, pte_t pte)
431 {
432 	if (sizeof(pteval_t) > sizeof(long))
433 		/* 5 arg words */
434 		pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
435 	else
436 		PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
437 			    mm, addr, ptep, pte.pte);
438 }
439 
440 static inline void set_pte(pte_t *ptep, pte_t pte)
441 {
442 	if (sizeof(pteval_t) > sizeof(long))
443 		PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
444 			    pte.pte, (u64)pte.pte >> 32);
445 	else
446 		PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
447 			    pte.pte);
448 }
449 
450 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
451 			      pte_t *ptep, pte_t pte)
452 {
453 	if (sizeof(pteval_t) > sizeof(long))
454 		/* 5 arg words */
455 		pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
456 	else
457 		PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
458 }
459 
460 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
461 {
462 	pmdval_t val = native_pmd_val(pmd);
463 
464 	if (sizeof(pmdval_t) > sizeof(long))
465 		PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
466 	else
467 		PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
468 }
469 
470 #if CONFIG_PGTABLE_LEVELS >= 3
471 static inline pmd_t __pmd(pmdval_t val)
472 {
473 	pmdval_t ret;
474 
475 	if (sizeof(pmdval_t) > sizeof(long))
476 		ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
477 				   val, (u64)val >> 32);
478 	else
479 		ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
480 				   val);
481 
482 	return (pmd_t) { ret };
483 }
484 
485 static inline pmdval_t pmd_val(pmd_t pmd)
486 {
487 	pmdval_t ret;
488 
489 	if (sizeof(pmdval_t) > sizeof(long))
490 		ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
491 				    pmd.pmd, (u64)pmd.pmd >> 32);
492 	else
493 		ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
494 				    pmd.pmd);
495 
496 	return ret;
497 }
498 
499 static inline void set_pud(pud_t *pudp, pud_t pud)
500 {
501 	pudval_t val = native_pud_val(pud);
502 
503 	if (sizeof(pudval_t) > sizeof(long))
504 		PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
505 			    val, (u64)val >> 32);
506 	else
507 		PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
508 			    val);
509 }
510 #if CONFIG_PGTABLE_LEVELS >= 4
511 static inline pud_t __pud(pudval_t val)
512 {
513 	pudval_t ret;
514 
515 	if (sizeof(pudval_t) > sizeof(long))
516 		ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
517 				   val, (u64)val >> 32);
518 	else
519 		ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
520 				   val);
521 
522 	return (pud_t) { ret };
523 }
524 
525 static inline pudval_t pud_val(pud_t pud)
526 {
527 	pudval_t ret;
528 
529 	if (sizeof(pudval_t) > sizeof(long))
530 		ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
531 				    pud.pud, (u64)pud.pud >> 32);
532 	else
533 		ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
534 				    pud.pud);
535 
536 	return ret;
537 }
538 
539 static inline void pud_clear(pud_t *pudp)
540 {
541 	set_pud(pudp, __pud(0));
542 }
543 
544 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
545 {
546 	p4dval_t val = native_p4d_val(p4d);
547 
548 	if (sizeof(p4dval_t) > sizeof(long))
549 		PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp,
550 			    val, (u64)val >> 32);
551 	else
552 		PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp,
553 			    val);
554 }
555 
556 #if CONFIG_PGTABLE_LEVELS >= 5
557 
558 static inline p4d_t __p4d(p4dval_t val)
559 {
560 	p4dval_t ret = PVOP_CALLEE1(p4dval_t, pv_mmu_ops.make_p4d, val);
561 
562 	return (p4d_t) { ret };
563 }
564 
565 static inline p4dval_t p4d_val(p4d_t p4d)
566 {
567 	return PVOP_CALLEE1(p4dval_t, pv_mmu_ops.p4d_val, p4d.p4d);
568 }
569 
570 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
571 {
572 	pgdval_t val = native_pgd_val(pgd);
573 
574 	PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, val);
575 }
576 
577 static inline void pgd_clear(pgd_t *pgdp)
578 {
579 	set_pgd(pgdp, __pgd(0));
580 }
581 
582 #endif  /* CONFIG_PGTABLE_LEVELS == 5 */
583 
584 static inline void p4d_clear(p4d_t *p4dp)
585 {
586 	set_p4d(p4dp, __p4d(0));
587 }
588 
589 #endif	/* CONFIG_PGTABLE_LEVELS == 4 */
590 
591 #endif	/* CONFIG_PGTABLE_LEVELS >= 3 */
592 
593 #ifdef CONFIG_X86_PAE
594 /* Special-case pte-setting operations for PAE, which can't update a
595    64-bit pte atomically */
596 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
597 {
598 	PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
599 		    pte.pte, pte.pte >> 32);
600 }
601 
602 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
603 			     pte_t *ptep)
604 {
605 	PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
606 }
607 
608 static inline void pmd_clear(pmd_t *pmdp)
609 {
610 	PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
611 }
612 #else  /* !CONFIG_X86_PAE */
613 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
614 {
615 	set_pte(ptep, pte);
616 }
617 
618 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
619 			     pte_t *ptep)
620 {
621 	set_pte_at(mm, addr, ptep, __pte(0));
622 }
623 
624 static inline void pmd_clear(pmd_t *pmdp)
625 {
626 	set_pmd(pmdp, __pmd(0));
627 }
628 #endif	/* CONFIG_X86_PAE */
629 
630 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
631 static inline void arch_start_context_switch(struct task_struct *prev)
632 {
633 	PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
634 }
635 
636 static inline void arch_end_context_switch(struct task_struct *next)
637 {
638 	PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
639 }
640 
641 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
642 static inline void arch_enter_lazy_mmu_mode(void)
643 {
644 	PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
645 }
646 
647 static inline void arch_leave_lazy_mmu_mode(void)
648 {
649 	PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
650 }
651 
652 static inline void arch_flush_lazy_mmu_mode(void)
653 {
654 	PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
655 }
656 
657 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
658 				phys_addr_t phys, pgprot_t flags)
659 {
660 	pv_mmu_ops.set_fixmap(idx, phys, flags);
661 }
662 
663 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
664 
665 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
666 							u32 val)
667 {
668 	PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
669 }
670 
671 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
672 {
673 	PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
674 }
675 
676 static __always_inline void pv_wait(u8 *ptr, u8 val)
677 {
678 	PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
679 }
680 
681 static __always_inline void pv_kick(int cpu)
682 {
683 	PVOP_VCALL1(pv_lock_ops.kick, cpu);
684 }
685 
686 static __always_inline bool pv_vcpu_is_preempted(long cpu)
687 {
688 	return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
689 }
690 
691 #endif /* SMP && PARAVIRT_SPINLOCKS */
692 
693 #ifdef CONFIG_X86_32
694 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
695 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
696 
697 /* save and restore all caller-save registers, except return value */
698 #define PV_SAVE_ALL_CALLER_REGS		"pushl %ecx;"
699 #define PV_RESTORE_ALL_CALLER_REGS	"popl  %ecx;"
700 
701 #define PV_FLAGS_ARG "0"
702 #define PV_EXTRA_CLOBBERS
703 #define PV_VEXTRA_CLOBBERS
704 #else
705 /* save and restore all caller-save registers, except return value */
706 #define PV_SAVE_ALL_CALLER_REGS						\
707 	"push %rcx;"							\
708 	"push %rdx;"							\
709 	"push %rsi;"							\
710 	"push %rdi;"							\
711 	"push %r8;"							\
712 	"push %r9;"							\
713 	"push %r10;"							\
714 	"push %r11;"
715 #define PV_RESTORE_ALL_CALLER_REGS					\
716 	"pop %r11;"							\
717 	"pop %r10;"							\
718 	"pop %r9;"							\
719 	"pop %r8;"							\
720 	"pop %rdi;"							\
721 	"pop %rsi;"							\
722 	"pop %rdx;"							\
723 	"pop %rcx;"
724 
725 /* We save some registers, but all of them, that's too much. We clobber all
726  * caller saved registers but the argument parameter */
727 #define PV_SAVE_REGS "pushq %%rdi;"
728 #define PV_RESTORE_REGS "popq %%rdi;"
729 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
730 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
731 #define PV_FLAGS_ARG "D"
732 #endif
733 
734 /*
735  * Generate a thunk around a function which saves all caller-save
736  * registers except for the return value.  This allows C functions to
737  * be called from assembler code where fewer than normal registers are
738  * available.  It may also help code generation around calls from C
739  * code if the common case doesn't use many registers.
740  *
741  * When a callee is wrapped in a thunk, the caller can assume that all
742  * arg regs and all scratch registers are preserved across the
743  * call. The return value in rax/eax will not be saved, even for void
744  * functions.
745  */
746 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
747 #define PV_CALLEE_SAVE_REGS_THUNK(func)					\
748 	extern typeof(func) __raw_callee_save_##func;			\
749 									\
750 	asm(".pushsection .text;"					\
751 	    ".globl " PV_THUNK_NAME(func) ";"				\
752 	    ".type " PV_THUNK_NAME(func) ", @function;"			\
753 	    PV_THUNK_NAME(func) ":"					\
754 	    FRAME_BEGIN							\
755 	    PV_SAVE_ALL_CALLER_REGS					\
756 	    "call " #func ";"						\
757 	    PV_RESTORE_ALL_CALLER_REGS					\
758 	    FRAME_END							\
759 	    "ret;"							\
760 	    ".popsection")
761 
762 /* Get a reference to a callee-save function */
763 #define PV_CALLEE_SAVE(func)						\
764 	((struct paravirt_callee_save) { __raw_callee_save_##func })
765 
766 /* Promise that "func" already uses the right calling convention */
767 #define __PV_IS_CALLEE_SAVE(func)			\
768 	((struct paravirt_callee_save) { func })
769 
770 static inline notrace unsigned long arch_local_save_flags(void)
771 {
772 	return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
773 }
774 
775 static inline notrace void arch_local_irq_restore(unsigned long f)
776 {
777 	PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
778 }
779 
780 static inline notrace void arch_local_irq_disable(void)
781 {
782 	PVOP_VCALLEE0(pv_irq_ops.irq_disable);
783 }
784 
785 static inline notrace void arch_local_irq_enable(void)
786 {
787 	PVOP_VCALLEE0(pv_irq_ops.irq_enable);
788 }
789 
790 static inline notrace unsigned long arch_local_irq_save(void)
791 {
792 	unsigned long f;
793 
794 	f = arch_local_save_flags();
795 	arch_local_irq_disable();
796 	return f;
797 }
798 
799 
800 /* Make sure as little as possible of this mess escapes. */
801 #undef PARAVIRT_CALL
802 #undef __PVOP_CALL
803 #undef __PVOP_VCALL
804 #undef PVOP_VCALL0
805 #undef PVOP_CALL0
806 #undef PVOP_VCALL1
807 #undef PVOP_CALL1
808 #undef PVOP_VCALL2
809 #undef PVOP_CALL2
810 #undef PVOP_VCALL3
811 #undef PVOP_CALL3
812 #undef PVOP_VCALL4
813 #undef PVOP_CALL4
814 
815 extern void default_banner(void);
816 
817 #else  /* __ASSEMBLY__ */
818 
819 #define _PVSITE(ptype, clobbers, ops, word, algn)	\
820 771:;						\
821 	ops;					\
822 772:;						\
823 	.pushsection .parainstructions,"a";	\
824 	 .align	algn;				\
825 	 word 771b;				\
826 	 .byte ptype;				\
827 	 .byte 772b-771b;			\
828 	 .short clobbers;			\
829 	.popsection
830 
831 
832 #define COND_PUSH(set, mask, reg)			\
833 	.if ((~(set)) & mask); push %reg; .endif
834 #define COND_POP(set, mask, reg)			\
835 	.if ((~(set)) & mask); pop %reg; .endif
836 
837 #ifdef CONFIG_X86_64
838 
839 #define PV_SAVE_REGS(set)			\
840 	COND_PUSH(set, CLBR_RAX, rax);		\
841 	COND_PUSH(set, CLBR_RCX, rcx);		\
842 	COND_PUSH(set, CLBR_RDX, rdx);		\
843 	COND_PUSH(set, CLBR_RSI, rsi);		\
844 	COND_PUSH(set, CLBR_RDI, rdi);		\
845 	COND_PUSH(set, CLBR_R8, r8);		\
846 	COND_PUSH(set, CLBR_R9, r9);		\
847 	COND_PUSH(set, CLBR_R10, r10);		\
848 	COND_PUSH(set, CLBR_R11, r11)
849 #define PV_RESTORE_REGS(set)			\
850 	COND_POP(set, CLBR_R11, r11);		\
851 	COND_POP(set, CLBR_R10, r10);		\
852 	COND_POP(set, CLBR_R9, r9);		\
853 	COND_POP(set, CLBR_R8, r8);		\
854 	COND_POP(set, CLBR_RDI, rdi);		\
855 	COND_POP(set, CLBR_RSI, rsi);		\
856 	COND_POP(set, CLBR_RDX, rdx);		\
857 	COND_POP(set, CLBR_RCX, rcx);		\
858 	COND_POP(set, CLBR_RAX, rax)
859 
860 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
861 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
862 #define PARA_INDIRECT(addr)	*addr(%rip)
863 #else
864 #define PV_SAVE_REGS(set)			\
865 	COND_PUSH(set, CLBR_EAX, eax);		\
866 	COND_PUSH(set, CLBR_EDI, edi);		\
867 	COND_PUSH(set, CLBR_ECX, ecx);		\
868 	COND_PUSH(set, CLBR_EDX, edx)
869 #define PV_RESTORE_REGS(set)			\
870 	COND_POP(set, CLBR_EDX, edx);		\
871 	COND_POP(set, CLBR_ECX, ecx);		\
872 	COND_POP(set, CLBR_EDI, edi);		\
873 	COND_POP(set, CLBR_EAX, eax)
874 
875 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
876 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
877 #define PARA_INDIRECT(addr)	*%cs:addr
878 #endif
879 
880 #define INTERRUPT_RETURN						\
881 	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,	\
882 		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
883 
884 #define DISABLE_INTERRUPTS(clobbers)					\
885 	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
886 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
887 		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);	\
888 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
889 
890 #define ENABLE_INTERRUPTS(clobbers)					\
891 	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,	\
892 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
893 		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);	\
894 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
895 
896 #ifdef CONFIG_X86_32
897 #define GET_CR0_INTO_EAX				\
898 	push %ecx; push %edx;				\
899 	call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0);	\
900 	pop %edx; pop %ecx
901 #else	/* !CONFIG_X86_32 */
902 
903 /*
904  * If swapgs is used while the userspace stack is still current,
905  * there's no way to call a pvop.  The PV replacement *must* be
906  * inlined, or the swapgs instruction must be trapped and emulated.
907  */
908 #define SWAPGS_UNSAFE_STACK						\
909 	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
910 		  swapgs)
911 
912 /*
913  * Note: swapgs is very special, and in practise is either going to be
914  * implemented with a single "swapgs" instruction or something very
915  * special.  Either way, we don't need to save any registers for
916  * it.
917  */
918 #define SWAPGS								\
919 	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
920 		  call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)		\
921 		 )
922 
923 #define GET_CR2_INTO_RAX				\
924 	call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
925 
926 #define USERGS_SYSRET64							\
927 	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),	\
928 		  CLBR_NONE,						\
929 		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
930 #endif	/* CONFIG_X86_32 */
931 
932 #endif /* __ASSEMBLY__ */
933 #else  /* CONFIG_PARAVIRT */
934 # define default_banner x86_init_noop
935 #ifndef __ASSEMBLY__
936 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
937 					  struct mm_struct *mm)
938 {
939 }
940 
941 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
942 {
943 }
944 #endif /* __ASSEMBLY__ */
945 #endif /* !CONFIG_PARAVIRT */
946 #endif /* _ASM_X86_PARAVIRT_H */
947