1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PARAVIRT_TYPES_H
3 #define _ASM_X86_PARAVIRT_TYPES_H
4 
5 #ifdef CONFIG_PARAVIRT
6 
7 #ifndef __ASSEMBLER__
8 #include <linux/types.h>
9 
10 #include <asm/desc_defs.h>
11 #include <asm/pgtable_types.h>
12 #include <asm/nospec-branch.h>
13 
14 struct page;
15 struct thread_struct;
16 struct desc_ptr;
17 struct tss_struct;
18 struct mm_struct;
19 struct desc_struct;
20 struct task_struct;
21 struct cpumask;
22 struct flush_tlb_info;
23 struct mmu_gather;
24 struct vm_area_struct;
25 
26 /*
27  * Wrapper type for pointers to code which uses the non-standard
28  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
29  */
30 struct paravirt_callee_save {
31 	void *func;
32 };
33 
34 /* general info */
35 struct pv_info {
36 #ifdef CONFIG_PARAVIRT_XXL
37 	u16 extra_user_64bit_cs;  /* __USER_CS if none */
38 #endif
39 
40 	const char *name;
41 };
42 
43 #ifdef CONFIG_PARAVIRT_XXL
44 struct pv_lazy_ops {
45 	/* Set deferred update mode, used for batching operations. */
46 	void (*enter)(void);
47 	void (*leave)(void);
48 	void (*flush)(void);
49 } __no_randomize_layout;
50 #endif
51 
52 struct pv_cpu_ops {
53 	/* hooks for various privileged instructions */
54 	void (*io_delay)(void);
55 
56 #ifdef CONFIG_PARAVIRT_XXL
57 	unsigned long (*get_debugreg)(int regno);
58 	void (*set_debugreg)(int regno, unsigned long value);
59 
60 	unsigned long (*read_cr0)(void);
61 	void (*write_cr0)(unsigned long);
62 
63 	void (*write_cr4)(unsigned long);
64 
65 	/* Segment descriptor handling */
66 	void (*load_tr_desc)(void);
67 	void (*load_gdt)(const struct desc_ptr *);
68 	void (*load_idt)(const struct desc_ptr *);
69 	void (*set_ldt)(const void *desc, unsigned entries);
70 	unsigned long (*store_tr)(void);
71 	void (*load_tls)(struct thread_struct *t, unsigned int cpu);
72 	void (*load_gs_index)(unsigned int idx);
73 	void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
74 				const void *desc);
75 	void (*write_gdt_entry)(struct desc_struct *,
76 				int entrynum, const void *desc, int size);
77 	void (*write_idt_entry)(gate_desc *,
78 				int entrynum, const gate_desc *gate);
79 	void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
80 	void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
81 
82 	void (*load_sp0)(unsigned long sp0);
83 
84 #ifdef CONFIG_X86_IOPL_IOPERM
85 	void (*invalidate_io_bitmap)(void);
86 	void (*update_io_bitmap)(void);
87 #endif
88 
89 	/* cpuid emulation, mostly so that caps bits can be disabled */
90 	void (*cpuid)(unsigned int *eax, unsigned int *ebx,
91 		      unsigned int *ecx, unsigned int *edx);
92 
93 	/* Unsafe MSR operations.  These will warn or panic on failure. */
94 	u64 (*read_msr)(unsigned int msr);
95 	void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
96 
97 	/*
98 	 * Safe MSR operations.
99 	 * read sets err to 0 or -EIO.  write returns 0 or -EIO.
100 	 */
101 	u64 (*read_msr_safe)(unsigned int msr, int *err);
102 	int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
103 
104 	u64 (*read_pmc)(int counter);
105 
106 	void (*start_context_switch)(struct task_struct *prev);
107 	void (*end_context_switch)(struct task_struct *next);
108 #endif
109 } __no_randomize_layout;
110 
111 struct pv_irq_ops {
112 #ifdef CONFIG_PARAVIRT_XXL
113 	/*
114 	 * Get/set interrupt state.  save_fl is expected to use X86_EFLAGS_IF;
115 	 * all other bits returned from save_fl are undefined.
116 	 *
117 	 * NOTE: These functions callers expect the callee to preserve
118 	 * more registers than the standard C calling convention.
119 	 */
120 	struct paravirt_callee_save save_fl;
121 	struct paravirt_callee_save irq_disable;
122 	struct paravirt_callee_save irq_enable;
123 #endif
124 	void (*safe_halt)(void);
125 	void (*halt)(void);
126 } __no_randomize_layout;
127 
128 struct pv_mmu_ops {
129 	/* TLB operations */
130 	void (*flush_tlb_user)(void);
131 	void (*flush_tlb_kernel)(void);
132 	void (*flush_tlb_one_user)(unsigned long addr);
133 	void (*flush_tlb_multi)(const struct cpumask *cpus,
134 				const struct flush_tlb_info *info);
135 
136 	/* Hook for intercepting the destruction of an mm_struct. */
137 	void (*exit_mmap)(struct mm_struct *mm);
138 	void (*notify_page_enc_status_changed)(unsigned long pfn, int npages, bool enc);
139 
140 #ifdef CONFIG_PARAVIRT_XXL
141 	struct paravirt_callee_save read_cr2;
142 	void (*write_cr2)(unsigned long);
143 
144 	unsigned long (*read_cr3)(void);
145 	void (*write_cr3)(unsigned long);
146 
147 	/* Hook for intercepting the creation/use of an mm_struct. */
148 	void (*enter_mmap)(struct mm_struct *mm);
149 
150 	/* Hooks for allocating and freeing a pagetable top-level */
151 	int  (*pgd_alloc)(struct mm_struct *mm);
152 	void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
153 
154 	/*
155 	 * Hooks for allocating/releasing pagetable pages when they're
156 	 * attached to a pagetable
157 	 */
158 	void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
159 	void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
160 	void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
161 	void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
162 	void (*release_pte)(unsigned long pfn);
163 	void (*release_pmd)(unsigned long pfn);
164 	void (*release_pud)(unsigned long pfn);
165 	void (*release_p4d)(unsigned long pfn);
166 
167 	/* Pagetable manipulation functions */
168 	void (*set_pte)(pte_t *ptep, pte_t pteval);
169 	void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
170 
171 	pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
172 					pte_t *ptep);
173 	void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
174 					pte_t *ptep, pte_t pte);
175 
176 	struct paravirt_callee_save pte_val;
177 	struct paravirt_callee_save make_pte;
178 
179 	struct paravirt_callee_save pgd_val;
180 	struct paravirt_callee_save make_pgd;
181 
182 	void (*set_pud)(pud_t *pudp, pud_t pudval);
183 
184 	struct paravirt_callee_save pmd_val;
185 	struct paravirt_callee_save make_pmd;
186 
187 	struct paravirt_callee_save pud_val;
188 	struct paravirt_callee_save make_pud;
189 
190 	void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
191 
192 #if CONFIG_PGTABLE_LEVELS >= 5
193 	struct paravirt_callee_save p4d_val;
194 	struct paravirt_callee_save make_p4d;
195 
196 	void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
197 #endif	/* CONFIG_PGTABLE_LEVELS >= 5 */
198 
199 	struct pv_lazy_ops lazy_mode;
200 
201 	/* dom0 ops */
202 
203 	/* Sometimes the physical address is a pfn, and sometimes its
204 	   an mfn.  We can tell which is which from the index. */
205 	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
206 			   phys_addr_t phys, pgprot_t flags);
207 #endif
208 } __no_randomize_layout;
209 
210 struct arch_spinlock;
211 #ifdef CONFIG_SMP
212 #include <asm/spinlock_types.h>
213 #endif
214 
215 struct qspinlock;
216 
217 struct pv_lock_ops {
218 	void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
219 	struct paravirt_callee_save queued_spin_unlock;
220 
221 	void (*wait)(u8 *ptr, u8 val);
222 	void (*kick)(int cpu);
223 
224 	struct paravirt_callee_save vcpu_is_preempted;
225 } __no_randomize_layout;
226 
227 /* This contains all the paravirt structures: we get a convenient
228  * number for each function using the offset which we use to indicate
229  * what to patch. */
230 struct paravirt_patch_template {
231 	struct pv_cpu_ops	cpu;
232 	struct pv_irq_ops	irq;
233 	struct pv_mmu_ops	mmu;
234 	struct pv_lock_ops	lock;
235 } __no_randomize_layout;
236 
237 extern struct pv_info pv_info;
238 extern struct paravirt_patch_template pv_ops;
239 
240 #define paravirt_ptr(op)	[paravirt_opptr] "m" (pv_ops.op)
241 
242 /*
243  * This generates an indirect call based on the operation type number.
244  *
245  * Since alternatives run after enabling CET/IBT -- the latter setting/clearing
246  * capabilities and the former requiring all capabilities being finalized --
247  * these indirect calls are subject to IBT and the paravirt stubs should have
248  * ENDBR on.
249  *
250  * OTOH since this is effectively a __nocfi indirect call, the paravirt stubs
251  * don't need to bother with CFI prefixes.
252  */
253 #define PARAVIRT_CALL					\
254 	ANNOTATE_RETPOLINE_SAFE				\
255 	"call *%[paravirt_opptr];"
256 
257 /*
258  * These macros are intended to wrap calls through one of the paravirt
259  * ops structs, so that they can be later identified and patched at
260  * runtime.
261  *
262  * Normally, a call to a pv_op function is a simple indirect call:
263  * (pv_op_struct.operations)(args...).
264  *
265  * Unfortunately, this is a relatively slow operation for modern CPUs,
266  * because it cannot necessarily determine what the destination
267  * address is.  In this case, the address is a runtime constant, so at
268  * the very least we can patch the call to a simple direct call, or,
269  * ideally, patch an inline implementation into the callsite.  (Direct
270  * calls are essentially free, because the call and return addresses
271  * are completely predictable.)
272  *
273  * For i386, these macros rely on the standard gcc "regparm(3)" calling
274  * convention, in which the first three arguments are placed in %eax,
275  * %edx, %ecx (in that order), and the remaining arguments are placed
276  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
277  * to be modified (either clobbered or used for return values).
278  * X86_64, on the other hand, already specifies a register-based calling
279  * conventions, returning at %rax, with parameters going in %rdi, %rsi,
280  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
281  * special handling for dealing with 4 arguments, unlike i386.
282  * However, x86_64 also has to clobber all caller saved registers, which
283  * unfortunately, are quite a bit (r8 - r11)
284  *
285  * Unfortunately there's no way to get gcc to generate the args setup
286  * for the call, and then allow the call itself to be generated by an
287  * inline asm.  Because of this, we must do the complete arg setup and
288  * return value handling from within these macros.  This is fairly
289  * cumbersome.
290  *
291  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
292  * It could be extended to more arguments, but there would be little
293  * to be gained from that.  For each number of arguments, there are
294  * two VCALL and CALL variants for void and non-void functions.
295  *
296  * When there is a return value, the invoker of the macro must specify
297  * the return type.  The macro then uses sizeof() on that type to
298  * determine whether it's a 32 or 64 bit value and places the return
299  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
300  * 64-bit). For x86_64 machines, it just returns in %rax regardless of
301  * the return value size.
302  *
303  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments;
304  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
305  * in low,high order
306  *
307  * Small structures are passed and returned in registers.  The macro
308  * calling convention can't directly deal with this, so the wrapper
309  * functions must do it.
310  *
311  * These PVOP_* macros are only defined within this header.  This
312  * means that all uses must be wrapped in inline functions.  This also
313  * makes sure the incoming and outgoing types are always correct.
314  */
315 #ifdef CONFIG_X86_32
316 #define PVOP_CALL_ARGS							\
317 	unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
318 
319 #define PVOP_CALL_ARG1(x)		"a" ((unsigned long)(x))
320 #define PVOP_CALL_ARG2(x)		"d" ((unsigned long)(x))
321 #define PVOP_CALL_ARG3(x)		"c" ((unsigned long)(x))
322 
323 #define PVOP_VCALL_CLOBBERS		"=a" (__eax), "=d" (__edx),	\
324 					"=c" (__ecx)
325 #define PVOP_CALL_CLOBBERS		PVOP_VCALL_CLOBBERS
326 
327 #define PVOP_VCALLEE_CLOBBERS		"=a" (__eax), "=d" (__edx)
328 #define PVOP_CALLEE_CLOBBERS		PVOP_VCALLEE_CLOBBERS
329 
330 #define EXTRA_CLOBBERS
331 #define VEXTRA_CLOBBERS
332 #else  /* CONFIG_X86_64 */
333 /* [re]ax isn't an arg, but the return val */
334 #define PVOP_CALL_ARGS						\
335 	unsigned long __edi = __edi, __esi = __esi,		\
336 		__edx = __edx, __ecx = __ecx, __eax = __eax;
337 
338 #define PVOP_CALL_ARG1(x)		"D" ((unsigned long)(x))
339 #define PVOP_CALL_ARG2(x)		"S" ((unsigned long)(x))
340 #define PVOP_CALL_ARG3(x)		"d" ((unsigned long)(x))
341 #define PVOP_CALL_ARG4(x)		"c" ((unsigned long)(x))
342 
343 #define PVOP_VCALL_CLOBBERS	"=D" (__edi),				\
344 				"=S" (__esi), "=d" (__edx),		\
345 				"=c" (__ecx)
346 #define PVOP_CALL_CLOBBERS	PVOP_VCALL_CLOBBERS, "=a" (__eax)
347 
348 /*
349  * void functions are still allowed [re]ax for scratch.
350  *
351  * The ZERO_CALL_USED REGS feature may end up zeroing out callee-saved
352  * registers. Make sure we model this with the appropriate clobbers.
353  */
354 #ifdef CONFIG_ZERO_CALL_USED_REGS
355 #define PVOP_VCALLEE_CLOBBERS	"=a" (__eax), PVOP_VCALL_CLOBBERS
356 #else
357 #define PVOP_VCALLEE_CLOBBERS	"=a" (__eax)
358 #endif
359 #define PVOP_CALLEE_CLOBBERS	PVOP_VCALLEE_CLOBBERS
360 
361 #define EXTRA_CLOBBERS	 , "r8", "r9", "r10", "r11"
362 #define VEXTRA_CLOBBERS	 , "rax", "r8", "r9", "r10", "r11"
363 #endif	/* CONFIG_X86_32 */
364 
365 #ifdef CONFIG_PARAVIRT_DEBUG
366 #define PVOP_TEST_NULL(op)	BUG_ON(pv_ops.op == NULL)
367 #else
368 #define PVOP_TEST_NULL(op)	((void)pv_ops.op)
369 #endif
370 
371 #define PVOP_RETVAL(rettype)						\
372 	({	unsigned long __mask = ~0UL;				\
373 		BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long));	\
374 		switch (sizeof(rettype)) {				\
375 		case 1: __mask =       0xffUL; break;			\
376 		case 2: __mask =     0xffffUL; break;			\
377 		case 4: __mask = 0xffffffffUL; break;			\
378 		default: break;						\
379 		}							\
380 		__mask & __eax;						\
381 	})
382 
383 /*
384  * Use alternative patching for paravirt calls:
385  * - For replacing an indirect call with a direct one, use the "normal"
386  *   ALTERNATIVE() macro with the indirect call as the initial code sequence,
387  *   which will be replaced with the related direct call by using the
388  *   ALT_FLAG_DIRECT_CALL special case and the "always on" feature.
389  * - In case the replacement is either a direct call or a short code sequence
390  *   depending on a feature bit, the ALTERNATIVE_2() macro is being used.
391  *   The indirect call is the initial code sequence again, while the special
392  *   code sequence is selected with the specified feature bit. In case the
393  *   feature is not active, the direct call is used as above via the
394  *   ALT_FLAG_DIRECT_CALL special case and the "always on" feature.
395  */
396 #define ____PVOP_CALL(ret, op, call_clbr, extra_clbr, ...)	\
397 	({								\
398 		PVOP_CALL_ARGS;						\
399 		PVOP_TEST_NULL(op);					\
400 		asm volatile(ALTERNATIVE(PARAVIRT_CALL, ALT_CALL_INSTR,	\
401 				ALT_CALL_ALWAYS)			\
402 			     : call_clbr, ASM_CALL_CONSTRAINT		\
403 			     : paravirt_ptr(op),			\
404 			       ##__VA_ARGS__				\
405 			     : "memory", "cc" extra_clbr);		\
406 		ret;							\
407 	})
408 
409 #define ____PVOP_ALT_CALL(ret, op, alt, cond, call_clbr,		\
410 			  extra_clbr, ...)				\
411 	({								\
412 		PVOP_CALL_ARGS;						\
413 		PVOP_TEST_NULL(op);					\
414 		asm volatile(ALTERNATIVE_2(PARAVIRT_CALL,		\
415 				 ALT_CALL_INSTR, ALT_CALL_ALWAYS,	\
416 				 alt, cond)				\
417 			     : call_clbr, ASM_CALL_CONSTRAINT		\
418 			     : paravirt_ptr(op),			\
419 			       ##__VA_ARGS__				\
420 			     : "memory", "cc" extra_clbr);		\
421 		ret;							\
422 	})
423 
424 #define __PVOP_CALL(rettype, op, ...)					\
425 	____PVOP_CALL(PVOP_RETVAL(rettype), op,				\
426 		      PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS, ##__VA_ARGS__)
427 
428 #define __PVOP_ALT_CALL(rettype, op, alt, cond, ...)			\
429 	____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op, alt, cond,		\
430 			  PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS,		\
431 			  ##__VA_ARGS__)
432 
433 #define __PVOP_CALLEESAVE(rettype, op, ...)				\
434 	____PVOP_CALL(PVOP_RETVAL(rettype), op.func,			\
435 		      PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
436 
437 #define __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, ...)		\
438 	____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op.func, alt, cond,	\
439 			  PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
440 
441 
442 #define __PVOP_VCALL(op, ...)						\
443 	(void)____PVOP_CALL(, op, PVOP_VCALL_CLOBBERS,			\
444 		       VEXTRA_CLOBBERS, ##__VA_ARGS__)
445 
446 #define __PVOP_ALT_VCALL(op, alt, cond, ...)				\
447 	(void)____PVOP_ALT_CALL(, op, alt, cond,			\
448 				PVOP_VCALL_CLOBBERS, VEXTRA_CLOBBERS,	\
449 				##__VA_ARGS__)
450 
451 #define __PVOP_VCALLEESAVE(op, ...)					\
452 	(void)____PVOP_CALL(, op.func,					\
453 			    PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
454 
455 #define __PVOP_ALT_VCALLEESAVE(op, alt, cond, ...)			\
456 	(void)____PVOP_ALT_CALL(, op.func, alt, cond,			\
457 				PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
458 
459 
460 #define PVOP_CALL0(rettype, op)						\
461 	__PVOP_CALL(rettype, op)
462 #define PVOP_VCALL0(op)							\
463 	__PVOP_VCALL(op)
464 #define PVOP_ALT_CALL0(rettype, op, alt, cond)				\
465 	__PVOP_ALT_CALL(rettype, op, alt, cond)
466 #define PVOP_ALT_VCALL0(op, alt, cond)					\
467 	__PVOP_ALT_VCALL(op, alt, cond)
468 
469 #define PVOP_CALLEE0(rettype, op)					\
470 	__PVOP_CALLEESAVE(rettype, op)
471 #define PVOP_VCALLEE0(op)						\
472 	__PVOP_VCALLEESAVE(op)
473 #define PVOP_ALT_CALLEE0(rettype, op, alt, cond)			\
474 	__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond)
475 #define PVOP_ALT_VCALLEE0(op, alt, cond)				\
476 	__PVOP_ALT_VCALLEESAVE(op, alt, cond)
477 
478 
479 #define PVOP_CALL1(rettype, op, arg1)					\
480 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1))
481 #define PVOP_VCALL1(op, arg1)						\
482 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1))
483 #define PVOP_ALT_VCALL1(op, arg1, alt, cond)				\
484 	__PVOP_ALT_VCALL(op, alt, cond, PVOP_CALL_ARG1(arg1))
485 
486 #define PVOP_CALLEE1(rettype, op, arg1)					\
487 	__PVOP_CALLEESAVE(rettype, op, PVOP_CALL_ARG1(arg1))
488 #define PVOP_VCALLEE1(op, arg1)						\
489 	__PVOP_VCALLEESAVE(op, PVOP_CALL_ARG1(arg1))
490 #define PVOP_ALT_CALLEE1(rettype, op, arg1, alt, cond)			\
491 	__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, PVOP_CALL_ARG1(arg1))
492 #define PVOP_ALT_VCALLEE1(op, arg1, alt, cond)				\
493 	__PVOP_ALT_VCALLEESAVE(op, alt, cond, PVOP_CALL_ARG1(arg1))
494 
495 
496 #define PVOP_CALL2(rettype, op, arg1, arg2)				\
497 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
498 #define PVOP_VCALL2(op, arg1, arg2)					\
499 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
500 
501 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)			\
502 	__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1),			\
503 		    PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
504 #define PVOP_VCALL3(op, arg1, arg2, arg3)				\
505 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1),				\
506 		     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
507 
508 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)			\
509 	__PVOP_CALL(rettype, op,					\
510 		    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),		\
511 		    PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
512 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)				\
513 	__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),	\
514 		     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
515 
516 unsigned long paravirt_ret0(void);
517 #ifdef CONFIG_PARAVIRT_XXL
518 u64 _paravirt_ident_64(u64);
519 unsigned long pv_native_save_fl(void);
520 void pv_native_irq_disable(void);
521 void pv_native_irq_enable(void);
522 unsigned long pv_native_read_cr2(void);
523 #endif
524 
525 #define paravirt_nop	((void *)nop_func)
526 
527 #endif	/* __ASSEMBLER__ */
528 
529 #define ALT_NOT_XEN	ALT_NOT(X86_FEATURE_XENPV)
530 
531 #endif  /* CONFIG_PARAVIRT */
532 #endif	/* _ASM_X86_PARAVIRT_TYPES_H */
533