xref: /openbmc/linux/arch/x86/include/asm/paravirt.h (revision 7d94ab16) 
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 #include <asm/nospec-branch.h>
11 
12 #include <asm/paravirt_types.h>
13 
14 #ifndef __ASSEMBLY__
15 #include <linux/bug.h>
16 #include <linux/types.h>
17 #include <linux/cpumask.h>
18 #include <asm/frame.h>
19 
20 static inline unsigned long long paravirt_sched_clock(void)
21 {
22 	return PVOP_CALL0(unsigned long long, time.sched_clock);
23 }
24 
25 struct static_key;
26 extern struct static_key paravirt_steal_enabled;
27 extern struct static_key paravirt_steal_rq_enabled;
28 
29 __visible void __native_queued_spin_unlock(struct qspinlock *lock);
30 bool pv_is_native_spin_unlock(void);
31 __visible bool __native_vcpu_is_preempted(long cpu);
32 bool pv_is_native_vcpu_is_preempted(void);
33 
34 static inline u64 paravirt_steal_clock(int cpu)
35 {
36 	return PVOP_CALL1(u64, time.steal_clock, cpu);
37 }
38 
39 /* The paravirtualized I/O functions */
40 static inline void slow_down_io(void)
41 {
42 	pv_ops.cpu.io_delay();
43 #ifdef REALLY_SLOW_IO
44 	pv_ops.cpu.io_delay();
45 	pv_ops.cpu.io_delay();
46 	pv_ops.cpu.io_delay();
47 #endif
48 }
49 
50 static inline void __flush_tlb(void)
51 {
52 	PVOP_VCALL0(mmu.flush_tlb_user);
53 }
54 
55 static inline void __flush_tlb_global(void)
56 {
57 	PVOP_VCALL0(mmu.flush_tlb_kernel);
58 }
59 
60 static inline void __flush_tlb_one_user(unsigned long addr)
61 {
62 	PVOP_VCALL1(mmu.flush_tlb_one_user, addr);
63 }
64 
65 static inline void flush_tlb_others(const struct cpumask *cpumask,
66 				    const struct flush_tlb_info *info)
67 {
68 	PVOP_VCALL2(mmu.flush_tlb_others, cpumask, info);
69 }
70 
71 static inline void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
72 {
73 	PVOP_VCALL2(mmu.tlb_remove_table, tlb, table);
74 }
75 
76 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
77 {
78 	PVOP_VCALL1(mmu.exit_mmap, mm);
79 }
80 
81 #ifdef CONFIG_PARAVIRT_XXL
82 static inline void load_sp0(unsigned long sp0)
83 {
84 	PVOP_VCALL1(cpu.load_sp0, sp0);
85 }
86 
87 /* The paravirtualized CPUID instruction. */
88 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
89 			   unsigned int *ecx, unsigned int *edx)
90 {
91 	PVOP_VCALL4(cpu.cpuid, eax, ebx, ecx, edx);
92 }
93 
94 /*
95  * These special macros can be used to get or set a debugging register
96  */
97 static inline unsigned long paravirt_get_debugreg(int reg)
98 {
99 	return PVOP_CALL1(unsigned long, cpu.get_debugreg, reg);
100 }
101 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
102 static inline void set_debugreg(unsigned long val, int reg)
103 {
104 	PVOP_VCALL2(cpu.set_debugreg, reg, val);
105 }
106 
107 static inline unsigned long read_cr0(void)
108 {
109 	return PVOP_CALL0(unsigned long, cpu.read_cr0);
110 }
111 
112 static inline void write_cr0(unsigned long x)
113 {
114 	PVOP_VCALL1(cpu.write_cr0, x);
115 }
116 
117 static inline unsigned long read_cr2(void)
118 {
119 	return PVOP_CALLEE0(unsigned long, mmu.read_cr2);
120 }
121 
122 static inline void write_cr2(unsigned long x)
123 {
124 	PVOP_VCALL1(mmu.write_cr2, x);
125 }
126 
127 static inline unsigned long __read_cr3(void)
128 {
129 	return PVOP_CALL0(unsigned long, mmu.read_cr3);
130 }
131 
132 static inline void write_cr3(unsigned long x)
133 {
134 	PVOP_VCALL1(mmu.write_cr3, x);
135 }
136 
137 static inline void __write_cr4(unsigned long x)
138 {
139 	PVOP_VCALL1(cpu.write_cr4, x);
140 }
141 
142 static inline void arch_safe_halt(void)
143 {
144 	PVOP_VCALL0(irq.safe_halt);
145 }
146 
147 static inline void halt(void)
148 {
149 	PVOP_VCALL0(irq.halt);
150 }
151 
152 static inline void wbinvd(void)
153 {
154 	PVOP_VCALL0(cpu.wbinvd);
155 }
156 
157 #define get_kernel_rpl()  (pv_info.kernel_rpl)
158 
159 static inline u64 paravirt_read_msr(unsigned msr)
160 {
161 	return PVOP_CALL1(u64, cpu.read_msr, msr);
162 }
163 
164 static inline void paravirt_write_msr(unsigned msr,
165 				      unsigned low, unsigned high)
166 {
167 	PVOP_VCALL3(cpu.write_msr, msr, low, high);
168 }
169 
170 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
171 {
172 	return PVOP_CALL2(u64, cpu.read_msr_safe, msr, err);
173 }
174 
175 static inline int paravirt_write_msr_safe(unsigned msr,
176 					  unsigned low, unsigned high)
177 {
178 	return PVOP_CALL3(int, cpu.write_msr_safe, msr, low, high);
179 }
180 
181 #define rdmsr(msr, val1, val2)			\
182 do {						\
183 	u64 _l = paravirt_read_msr(msr);	\
184 	val1 = (u32)_l;				\
185 	val2 = _l >> 32;			\
186 } while (0)
187 
188 #define wrmsr(msr, val1, val2)			\
189 do {						\
190 	paravirt_write_msr(msr, val1, val2);	\
191 } while (0)
192 
193 #define rdmsrl(msr, val)			\
194 do {						\
195 	val = paravirt_read_msr(msr);		\
196 } while (0)
197 
198 static inline void wrmsrl(unsigned msr, u64 val)
199 {
200 	wrmsr(msr, (u32)val, (u32)(val>>32));
201 }
202 
203 #define wrmsr_safe(msr, a, b)	paravirt_write_msr_safe(msr, a, b)
204 
205 /* rdmsr with exception handling */
206 #define rdmsr_safe(msr, a, b)				\
207 ({							\
208 	int _err;					\
209 	u64 _l = paravirt_read_msr_safe(msr, &_err);	\
210 	(*a) = (u32)_l;					\
211 	(*b) = _l >> 32;				\
212 	_err;						\
213 })
214 
215 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
216 {
217 	int err;
218 
219 	*p = paravirt_read_msr_safe(msr, &err);
220 	return err;
221 }
222 
223 static inline unsigned long long paravirt_read_pmc(int counter)
224 {
225 	return PVOP_CALL1(u64, cpu.read_pmc, counter);
226 }
227 
228 #define rdpmc(counter, low, high)		\
229 do {						\
230 	u64 _l = paravirt_read_pmc(counter);	\
231 	low = (u32)_l;				\
232 	high = _l >> 32;			\
233 } while (0)
234 
235 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
236 
237 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
238 {
239 	PVOP_VCALL2(cpu.alloc_ldt, ldt, entries);
240 }
241 
242 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
243 {
244 	PVOP_VCALL2(cpu.free_ldt, ldt, entries);
245 }
246 
247 static inline void load_TR_desc(void)
248 {
249 	PVOP_VCALL0(cpu.load_tr_desc);
250 }
251 static inline void load_gdt(const struct desc_ptr *dtr)
252 {
253 	PVOP_VCALL1(cpu.load_gdt, dtr);
254 }
255 static inline void load_idt(const struct desc_ptr *dtr)
256 {
257 	PVOP_VCALL1(cpu.load_idt, dtr);
258 }
259 static inline void set_ldt(const void *addr, unsigned entries)
260 {
261 	PVOP_VCALL2(cpu.set_ldt, addr, entries);
262 }
263 static inline unsigned long paravirt_store_tr(void)
264 {
265 	return PVOP_CALL0(unsigned long, cpu.store_tr);
266 }
267 
268 #define store_tr(tr)	((tr) = paravirt_store_tr())
269 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
270 {
271 	PVOP_VCALL2(cpu.load_tls, t, cpu);
272 }
273 
274 #ifdef CONFIG_X86_64
275 static inline void load_gs_index(unsigned int gs)
276 {
277 	PVOP_VCALL1(cpu.load_gs_index, gs);
278 }
279 #endif
280 
281 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
282 				   const void *desc)
283 {
284 	PVOP_VCALL3(cpu.write_ldt_entry, dt, entry, desc);
285 }
286 
287 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
288 				   void *desc, int type)
289 {
290 	PVOP_VCALL4(cpu.write_gdt_entry, dt, entry, desc, type);
291 }
292 
293 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
294 {
295 	PVOP_VCALL3(cpu.write_idt_entry, dt, entry, g);
296 }
297 
298 static inline void paravirt_activate_mm(struct mm_struct *prev,
299 					struct mm_struct *next)
300 {
301 	PVOP_VCALL2(mmu.activate_mm, prev, next);
302 }
303 
304 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
305 					  struct mm_struct *mm)
306 {
307 	PVOP_VCALL2(mmu.dup_mmap, oldmm, mm);
308 }
309 
310 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
311 {
312 	return PVOP_CALL1(int, mmu.pgd_alloc, mm);
313 }
314 
315 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
316 {
317 	PVOP_VCALL2(mmu.pgd_free, mm, pgd);
318 }
319 
320 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
321 {
322 	PVOP_VCALL2(mmu.alloc_pte, mm, pfn);
323 }
324 static inline void paravirt_release_pte(unsigned long pfn)
325 {
326 	PVOP_VCALL1(mmu.release_pte, pfn);
327 }
328 
329 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
330 {
331 	PVOP_VCALL2(mmu.alloc_pmd, mm, pfn);
332 }
333 
334 static inline void paravirt_release_pmd(unsigned long pfn)
335 {
336 	PVOP_VCALL1(mmu.release_pmd, pfn);
337 }
338 
339 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
340 {
341 	PVOP_VCALL2(mmu.alloc_pud, mm, pfn);
342 }
343 static inline void paravirt_release_pud(unsigned long pfn)
344 {
345 	PVOP_VCALL1(mmu.release_pud, pfn);
346 }
347 
348 static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
349 {
350 	PVOP_VCALL2(mmu.alloc_p4d, mm, pfn);
351 }
352 
353 static inline void paravirt_release_p4d(unsigned long pfn)
354 {
355 	PVOP_VCALL1(mmu.release_p4d, pfn);
356 }
357 
358 static inline pte_t __pte(pteval_t val)
359 {
360 	pteval_t ret;
361 
362 	if (sizeof(pteval_t) > sizeof(long))
363 		ret = PVOP_CALLEE2(pteval_t, mmu.make_pte, val, (u64)val >> 32);
364 	else
365 		ret = PVOP_CALLEE1(pteval_t, mmu.make_pte, val);
366 
367 	return (pte_t) { .pte = ret };
368 }
369 
370 static inline pteval_t pte_val(pte_t pte)
371 {
372 	pteval_t ret;
373 
374 	if (sizeof(pteval_t) > sizeof(long))
375 		ret = PVOP_CALLEE2(pteval_t, mmu.pte_val,
376 				   pte.pte, (u64)pte.pte >> 32);
377 	else
378 		ret = PVOP_CALLEE1(pteval_t, mmu.pte_val, pte.pte);
379 
380 	return ret;
381 }
382 
383 static inline pgd_t __pgd(pgdval_t val)
384 {
385 	pgdval_t ret;
386 
387 	if (sizeof(pgdval_t) > sizeof(long))
388 		ret = PVOP_CALLEE2(pgdval_t, mmu.make_pgd, val, (u64)val >> 32);
389 	else
390 		ret = PVOP_CALLEE1(pgdval_t, mmu.make_pgd, val);
391 
392 	return (pgd_t) { ret };
393 }
394 
395 static inline pgdval_t pgd_val(pgd_t pgd)
396 {
397 	pgdval_t ret;
398 
399 	if (sizeof(pgdval_t) > sizeof(long))
400 		ret =  PVOP_CALLEE2(pgdval_t, mmu.pgd_val,
401 				    pgd.pgd, (u64)pgd.pgd >> 32);
402 	else
403 		ret =  PVOP_CALLEE1(pgdval_t, mmu.pgd_val, pgd.pgd);
404 
405 	return ret;
406 }
407 
408 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
409 static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr,
410 					   pte_t *ptep)
411 {
412 	pteval_t ret;
413 
414 	ret = PVOP_CALL3(pteval_t, mmu.ptep_modify_prot_start, vma, addr, ptep);
415 
416 	return (pte_t) { .pte = ret };
417 }
418 
419 static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
420 					   pte_t *ptep, pte_t old_pte, pte_t pte)
421 {
422 
423 	if (sizeof(pteval_t) > sizeof(long))
424 		/* 5 arg words */
425 		pv_ops.mmu.ptep_modify_prot_commit(vma, addr, ptep, pte);
426 	else
427 		PVOP_VCALL4(mmu.ptep_modify_prot_commit,
428 			    vma, addr, ptep, pte.pte);
429 }
430 
431 static inline void set_pte(pte_t *ptep, pte_t pte)
432 {
433 	if (sizeof(pteval_t) > sizeof(long))
434 		PVOP_VCALL3(mmu.set_pte, ptep, pte.pte, (u64)pte.pte >> 32);
435 	else
436 		PVOP_VCALL2(mmu.set_pte, ptep, pte.pte);
437 }
438 
439 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
440 			      pte_t *ptep, pte_t pte)
441 {
442 	if (sizeof(pteval_t) > sizeof(long))
443 		/* 5 arg words */
444 		pv_ops.mmu.set_pte_at(mm, addr, ptep, pte);
445 	else
446 		PVOP_VCALL4(mmu.set_pte_at, mm, addr, ptep, pte.pte);
447 }
448 
449 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
450 {
451 	pmdval_t val = native_pmd_val(pmd);
452 
453 	if (sizeof(pmdval_t) > sizeof(long))
454 		PVOP_VCALL3(mmu.set_pmd, pmdp, val, (u64)val >> 32);
455 	else
456 		PVOP_VCALL2(mmu.set_pmd, pmdp, val);
457 }
458 
459 #if CONFIG_PGTABLE_LEVELS >= 3
460 static inline pmd_t __pmd(pmdval_t val)
461 {
462 	pmdval_t ret;
463 
464 	if (sizeof(pmdval_t) > sizeof(long))
465 		ret = PVOP_CALLEE2(pmdval_t, mmu.make_pmd, val, (u64)val >> 32);
466 	else
467 		ret = PVOP_CALLEE1(pmdval_t, mmu.make_pmd, val);
468 
469 	return (pmd_t) { ret };
470 }
471 
472 static inline pmdval_t pmd_val(pmd_t pmd)
473 {
474 	pmdval_t ret;
475 
476 	if (sizeof(pmdval_t) > sizeof(long))
477 		ret =  PVOP_CALLEE2(pmdval_t, mmu.pmd_val,
478 				    pmd.pmd, (u64)pmd.pmd >> 32);
479 	else
480 		ret =  PVOP_CALLEE1(pmdval_t, mmu.pmd_val, pmd.pmd);
481 
482 	return ret;
483 }
484 
485 static inline void set_pud(pud_t *pudp, pud_t pud)
486 {
487 	pudval_t val = native_pud_val(pud);
488 
489 	if (sizeof(pudval_t) > sizeof(long))
490 		PVOP_VCALL3(mmu.set_pud, pudp, val, (u64)val >> 32);
491 	else
492 		PVOP_VCALL2(mmu.set_pud, pudp, val);
493 }
494 #if CONFIG_PGTABLE_LEVELS >= 4
495 static inline pud_t __pud(pudval_t val)
496 {
497 	pudval_t ret;
498 
499 	ret = PVOP_CALLEE1(pudval_t, mmu.make_pud, val);
500 
501 	return (pud_t) { ret };
502 }
503 
504 static inline pudval_t pud_val(pud_t pud)
505 {
506 	return PVOP_CALLEE1(pudval_t, mmu.pud_val, pud.pud);
507 }
508 
509 static inline void pud_clear(pud_t *pudp)
510 {
511 	set_pud(pudp, __pud(0));
512 }
513 
514 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
515 {
516 	p4dval_t val = native_p4d_val(p4d);
517 
518 	PVOP_VCALL2(mmu.set_p4d, p4dp, val);
519 }
520 
521 #if CONFIG_PGTABLE_LEVELS >= 5
522 
523 static inline p4d_t __p4d(p4dval_t val)
524 {
525 	p4dval_t ret = PVOP_CALLEE1(p4dval_t, mmu.make_p4d, val);
526 
527 	return (p4d_t) { ret };
528 }
529 
530 static inline p4dval_t p4d_val(p4d_t p4d)
531 {
532 	return PVOP_CALLEE1(p4dval_t, mmu.p4d_val, p4d.p4d);
533 }
534 
535 static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
536 {
537 	PVOP_VCALL2(mmu.set_pgd, pgdp, native_pgd_val(pgd));
538 }
539 
540 #define set_pgd(pgdp, pgdval) do {					\
541 	if (pgtable_l5_enabled())						\
542 		__set_pgd(pgdp, pgdval);				\
543 	else								\
544 		set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd });	\
545 } while (0)
546 
547 #define pgd_clear(pgdp) do {						\
548 	if (pgtable_l5_enabled())						\
549 		set_pgd(pgdp, __pgd(0));				\
550 } while (0)
551 
552 #endif  /* CONFIG_PGTABLE_LEVELS == 5 */
553 
554 static inline void p4d_clear(p4d_t *p4dp)
555 {
556 	set_p4d(p4dp, __p4d(0));
557 }
558 
559 #endif	/* CONFIG_PGTABLE_LEVELS == 4 */
560 
561 #endif	/* CONFIG_PGTABLE_LEVELS >= 3 */
562 
563 #ifdef CONFIG_X86_PAE
564 /* Special-case pte-setting operations for PAE, which can't update a
565    64-bit pte atomically */
566 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
567 {
568 	PVOP_VCALL3(mmu.set_pte_atomic, ptep, pte.pte, pte.pte >> 32);
569 }
570 
571 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
572 			     pte_t *ptep)
573 {
574 	PVOP_VCALL3(mmu.pte_clear, mm, addr, ptep);
575 }
576 
577 static inline void pmd_clear(pmd_t *pmdp)
578 {
579 	PVOP_VCALL1(mmu.pmd_clear, pmdp);
580 }
581 #else  /* !CONFIG_X86_PAE */
582 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
583 {
584 	set_pte(ptep, pte);
585 }
586 
587 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
588 			     pte_t *ptep)
589 {
590 	set_pte_at(mm, addr, ptep, __pte(0));
591 }
592 
593 static inline void pmd_clear(pmd_t *pmdp)
594 {
595 	set_pmd(pmdp, __pmd(0));
596 }
597 #endif	/* CONFIG_X86_PAE */
598 
599 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
600 static inline void arch_start_context_switch(struct task_struct *prev)
601 {
602 	PVOP_VCALL1(cpu.start_context_switch, prev);
603 }
604 
605 static inline void arch_end_context_switch(struct task_struct *next)
606 {
607 	PVOP_VCALL1(cpu.end_context_switch, next);
608 }
609 
610 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
611 static inline void arch_enter_lazy_mmu_mode(void)
612 {
613 	PVOP_VCALL0(mmu.lazy_mode.enter);
614 }
615 
616 static inline void arch_leave_lazy_mmu_mode(void)
617 {
618 	PVOP_VCALL0(mmu.lazy_mode.leave);
619 }
620 
621 static inline void arch_flush_lazy_mmu_mode(void)
622 {
623 	PVOP_VCALL0(mmu.lazy_mode.flush);
624 }
625 
626 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
627 				phys_addr_t phys, pgprot_t flags)
628 {
629 	pv_ops.mmu.set_fixmap(idx, phys, flags);
630 }
631 #endif
632 
633 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
634 
635 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
636 							u32 val)
637 {
638 	PVOP_VCALL2(lock.queued_spin_lock_slowpath, lock, val);
639 }
640 
641 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
642 {
643 	PVOP_VCALLEE1(lock.queued_spin_unlock, lock);
644 }
645 
646 static __always_inline void pv_wait(u8 *ptr, u8 val)
647 {
648 	PVOP_VCALL2(lock.wait, ptr, val);
649 }
650 
651 static __always_inline void pv_kick(int cpu)
652 {
653 	PVOP_VCALL1(lock.kick, cpu);
654 }
655 
656 static __always_inline bool pv_vcpu_is_preempted(long cpu)
657 {
658 	return PVOP_CALLEE1(bool, lock.vcpu_is_preempted, cpu);
659 }
660 
661 void __raw_callee_save___native_queued_spin_unlock(struct qspinlock *lock);
662 bool __raw_callee_save___native_vcpu_is_preempted(long cpu);
663 
664 #endif /* SMP && PARAVIRT_SPINLOCKS */
665 
666 #ifdef CONFIG_X86_32
667 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
668 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
669 
670 /* save and restore all caller-save registers, except return value */
671 #define PV_SAVE_ALL_CALLER_REGS		"pushl %ecx;"
672 #define PV_RESTORE_ALL_CALLER_REGS	"popl  %ecx;"
673 
674 #define PV_FLAGS_ARG "0"
675 #define PV_EXTRA_CLOBBERS
676 #define PV_VEXTRA_CLOBBERS
677 #else
678 /* save and restore all caller-save registers, except return value */
679 #define PV_SAVE_ALL_CALLER_REGS						\
680 	"push %rcx;"							\
681 	"push %rdx;"							\
682 	"push %rsi;"							\
683 	"push %rdi;"							\
684 	"push %r8;"							\
685 	"push %r9;"							\
686 	"push %r10;"							\
687 	"push %r11;"
688 #define PV_RESTORE_ALL_CALLER_REGS					\
689 	"pop %r11;"							\
690 	"pop %r10;"							\
691 	"pop %r9;"							\
692 	"pop %r8;"							\
693 	"pop %rdi;"							\
694 	"pop %rsi;"							\
695 	"pop %rdx;"							\
696 	"pop %rcx;"
697 
698 /* We save some registers, but all of them, that's too much. We clobber all
699  * caller saved registers but the argument parameter */
700 #define PV_SAVE_REGS "pushq %%rdi;"
701 #define PV_RESTORE_REGS "popq %%rdi;"
702 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
703 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
704 #define PV_FLAGS_ARG "D"
705 #endif
706 
707 /*
708  * Generate a thunk around a function which saves all caller-save
709  * registers except for the return value.  This allows C functions to
710  * be called from assembler code where fewer than normal registers are
711  * available.  It may also help code generation around calls from C
712  * code if the common case doesn't use many registers.
713  *
714  * When a callee is wrapped in a thunk, the caller can assume that all
715  * arg regs and all scratch registers are preserved across the
716  * call. The return value in rax/eax will not be saved, even for void
717  * functions.
718  */
719 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
720 #define PV_CALLEE_SAVE_REGS_THUNK(func)					\
721 	extern typeof(func) __raw_callee_save_##func;			\
722 									\
723 	asm(".pushsection .text;"					\
724 	    ".globl " PV_THUNK_NAME(func) ";"				\
725 	    ".type " PV_THUNK_NAME(func) ", @function;"			\
726 	    PV_THUNK_NAME(func) ":"					\
727 	    FRAME_BEGIN							\
728 	    PV_SAVE_ALL_CALLER_REGS					\
729 	    "call " #func ";"						\
730 	    PV_RESTORE_ALL_CALLER_REGS					\
731 	    FRAME_END							\
732 	    "ret;"							\
733 	    ".size " PV_THUNK_NAME(func) ", .-" PV_THUNK_NAME(func) ";"	\
734 	    ".popsection")
735 
736 /* Get a reference to a callee-save function */
737 #define PV_CALLEE_SAVE(func)						\
738 	((struct paravirt_callee_save) { __raw_callee_save_##func })
739 
740 /* Promise that "func" already uses the right calling convention */
741 #define __PV_IS_CALLEE_SAVE(func)			\
742 	((struct paravirt_callee_save) { func })
743 
744 #ifdef CONFIG_PARAVIRT_XXL
745 static inline notrace unsigned long arch_local_save_flags(void)
746 {
747 	return PVOP_CALLEE0(unsigned long, irq.save_fl);
748 }
749 
750 static inline notrace void arch_local_irq_restore(unsigned long f)
751 {
752 	PVOP_VCALLEE1(irq.restore_fl, f);
753 }
754 
755 static inline notrace void arch_local_irq_disable(void)
756 {
757 	PVOP_VCALLEE0(irq.irq_disable);
758 }
759 
760 static inline notrace void arch_local_irq_enable(void)
761 {
762 	PVOP_VCALLEE0(irq.irq_enable);
763 }
764 
765 static inline notrace unsigned long arch_local_irq_save(void)
766 {
767 	unsigned long f;
768 
769 	f = arch_local_save_flags();
770 	arch_local_irq_disable();
771 	return f;
772 }
773 #endif
774 
775 
776 /* Make sure as little as possible of this mess escapes. */
777 #undef PARAVIRT_CALL
778 #undef __PVOP_CALL
779 #undef __PVOP_VCALL
780 #undef PVOP_VCALL0
781 #undef PVOP_CALL0
782 #undef PVOP_VCALL1
783 #undef PVOP_CALL1
784 #undef PVOP_VCALL2
785 #undef PVOP_CALL2
786 #undef PVOP_VCALL3
787 #undef PVOP_CALL3
788 #undef PVOP_VCALL4
789 #undef PVOP_CALL4
790 
791 extern void default_banner(void);
792 
793 #else  /* __ASSEMBLY__ */
794 
795 #define _PVSITE(ptype, ops, word, algn)		\
796 771:;						\
797 	ops;					\
798 772:;						\
799 	.pushsection .parainstructions,"a";	\
800 	 .align	algn;				\
801 	 word 771b;				\
802 	 .byte ptype;				\
803 	 .byte 772b-771b;			\
804 	.popsection
805 
806 
807 #define COND_PUSH(set, mask, reg)			\
808 	.if ((~(set)) & mask); push %reg; .endif
809 #define COND_POP(set, mask, reg)			\
810 	.if ((~(set)) & mask); pop %reg; .endif
811 
812 #ifdef CONFIG_X86_64
813 
814 #define PV_SAVE_REGS(set)			\
815 	COND_PUSH(set, CLBR_RAX, rax);		\
816 	COND_PUSH(set, CLBR_RCX, rcx);		\
817 	COND_PUSH(set, CLBR_RDX, rdx);		\
818 	COND_PUSH(set, CLBR_RSI, rsi);		\
819 	COND_PUSH(set, CLBR_RDI, rdi);		\
820 	COND_PUSH(set, CLBR_R8, r8);		\
821 	COND_PUSH(set, CLBR_R9, r9);		\
822 	COND_PUSH(set, CLBR_R10, r10);		\
823 	COND_PUSH(set, CLBR_R11, r11)
824 #define PV_RESTORE_REGS(set)			\
825 	COND_POP(set, CLBR_R11, r11);		\
826 	COND_POP(set, CLBR_R10, r10);		\
827 	COND_POP(set, CLBR_R9, r9);		\
828 	COND_POP(set, CLBR_R8, r8);		\
829 	COND_POP(set, CLBR_RDI, rdi);		\
830 	COND_POP(set, CLBR_RSI, rsi);		\
831 	COND_POP(set, CLBR_RDX, rdx);		\
832 	COND_POP(set, CLBR_RCX, rcx);		\
833 	COND_POP(set, CLBR_RAX, rax)
834 
835 #define PARA_PATCH(off)		((off) / 8)
836 #define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .quad, 8)
837 #define PARA_INDIRECT(addr)	*addr(%rip)
838 #else
839 #define PV_SAVE_REGS(set)			\
840 	COND_PUSH(set, CLBR_EAX, eax);		\
841 	COND_PUSH(set, CLBR_EDI, edi);		\
842 	COND_PUSH(set, CLBR_ECX, ecx);		\
843 	COND_PUSH(set, CLBR_EDX, edx)
844 #define PV_RESTORE_REGS(set)			\
845 	COND_POP(set, CLBR_EDX, edx);		\
846 	COND_POP(set, CLBR_ECX, ecx);		\
847 	COND_POP(set, CLBR_EDI, edi);		\
848 	COND_POP(set, CLBR_EAX, eax)
849 
850 #define PARA_PATCH(off)		((off) / 4)
851 #define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .long, 4)
852 #define PARA_INDIRECT(addr)	*%cs:addr
853 #endif
854 
855 #ifdef CONFIG_PARAVIRT_XXL
856 #define INTERRUPT_RETURN						\
857 	PARA_SITE(PARA_PATCH(PV_CPU_iret),				\
858 		  ANNOTATE_RETPOLINE_SAFE;				\
859 		  jmp PARA_INDIRECT(pv_ops+PV_CPU_iret);)
860 
861 #define DISABLE_INTERRUPTS(clobbers)					\
862 	PARA_SITE(PARA_PATCH(PV_IRQ_irq_disable),			\
863 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
864 		  ANNOTATE_RETPOLINE_SAFE;				\
865 		  call PARA_INDIRECT(pv_ops+PV_IRQ_irq_disable);	\
866 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
867 
868 #define ENABLE_INTERRUPTS(clobbers)					\
869 	PARA_SITE(PARA_PATCH(PV_IRQ_irq_enable),			\
870 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
871 		  ANNOTATE_RETPOLINE_SAFE;				\
872 		  call PARA_INDIRECT(pv_ops+PV_IRQ_irq_enable);		\
873 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
874 #endif
875 
876 #ifdef CONFIG_X86_64
877 #ifdef CONFIG_PARAVIRT_XXL
878 /*
879  * If swapgs is used while the userspace stack is still current,
880  * there's no way to call a pvop.  The PV replacement *must* be
881  * inlined, or the swapgs instruction must be trapped and emulated.
882  */
883 #define SWAPGS_UNSAFE_STACK						\
884 	PARA_SITE(PARA_PATCH(PV_CPU_swapgs), swapgs)
885 
886 /*
887  * Note: swapgs is very special, and in practise is either going to be
888  * implemented with a single "swapgs" instruction or something very
889  * special.  Either way, we don't need to save any registers for
890  * it.
891  */
892 #define SWAPGS								\
893 	PARA_SITE(PARA_PATCH(PV_CPU_swapgs),				\
894 		  ANNOTATE_RETPOLINE_SAFE;				\
895 		  call PARA_INDIRECT(pv_ops+PV_CPU_swapgs);		\
896 		 )
897 
898 #define USERGS_SYSRET64							\
899 	PARA_SITE(PARA_PATCH(PV_CPU_usergs_sysret64),			\
900 		  ANNOTATE_RETPOLINE_SAFE;				\
901 		  jmp PARA_INDIRECT(pv_ops+PV_CPU_usergs_sysret64);)
902 
903 #ifdef CONFIG_DEBUG_ENTRY
904 #define SAVE_FLAGS(clobbers)                                        \
905 	PARA_SITE(PARA_PATCH(PV_IRQ_save_fl),			    \
906 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);        \
907 		  ANNOTATE_RETPOLINE_SAFE;			    \
908 		  call PARA_INDIRECT(pv_ops+PV_IRQ_save_fl);	    \
909 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
910 #endif
911 #endif /* CONFIG_PARAVIRT_XXL */
912 #endif	/* CONFIG_X86_64 */
913 
914 #ifdef CONFIG_PARAVIRT_XXL
915 
916 #define GET_CR2_INTO_AX							\
917 	PARA_SITE(PARA_PATCH(PV_MMU_read_cr2),				\
918 		  ANNOTATE_RETPOLINE_SAFE;				\
919 		  call PARA_INDIRECT(pv_ops+PV_MMU_read_cr2);		\
920 		 )
921 
922 #endif /* CONFIG_PARAVIRT_XXL */
923 
924 
925 #endif /* __ASSEMBLY__ */
926 #else  /* CONFIG_PARAVIRT */
927 # define default_banner x86_init_noop
928 #endif /* !CONFIG_PARAVIRT */
929 
930 #ifndef __ASSEMBLY__
931 #ifndef CONFIG_PARAVIRT_XXL
932 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
933 					  struct mm_struct *mm)
934 {
935 }
936 #endif
937 
938 #ifndef CONFIG_PARAVIRT
939 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
940 {
941 }
942 #endif
943 #endif /* __ASSEMBLY__ */
944 #endif /* _ASM_X86_PARAVIRT_H */
945