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1/* Paravirtualization interfaces
2 Copyright (C) 2006 Rusty Russell IBM Corporation
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17
18 2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
19*/
20
21#include <linux/errno.h>
22#include <linux/module.h>
23#include <linux/efi.h>
24#include <linux/bcd.h>
25#include <linux/highmem.h>
26
27#include <asm/bug.h>
28#include <asm/paravirt.h>
29#include <asm/debugreg.h>
30#include <asm/desc.h>
31#include <asm/setup.h>
32#include <asm/pgtable.h>
33#include <asm/time.h>
34#include <asm/pgalloc.h>
35#include <asm/irq.h>
36#include <asm/delay.h>
37#include <asm/fixmap.h>
38#include <asm/apic.h>
39#include <asm/tlbflush.h>
40#include <asm/timer.h>
41#include <asm/special_insns.h>
42
43/* nop stub */
44void _paravirt_nop(void)
45{
46}
47
48/* identity function, which can be inlined */
49u32 _paravirt_ident_32(u32 x)
50{
51 return x;
52}
53
54u64 _paravirt_ident_64(u64 x)
55{
56 return x;
57}
58
59void __init default_banner(void)
60{
61 printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
62 pv_info.name);
63}
64
65/* Simple instruction patching code. */
66#define DEF_NATIVE(ops, name, code) \
67 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
68 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
69
70/* Undefined instruction for dealing with missing ops pointers. */
71static const unsigned char ud2a[] = { 0x0f, 0x0b };
72
73unsigned paravirt_patch_nop(void)
74{
75 return 0;
76}
77
78unsigned paravirt_patch_ignore(unsigned len)
79{
80 return len;
81}
82
83struct branch {
84 unsigned char opcode;
85 u32 delta;
86} __attribute__((packed));
87
88unsigned paravirt_patch_call(void *insnbuf,
89 const void *target, u16 tgt_clobbers,
90 unsigned long addr, u16 site_clobbers,
91 unsigned len)
92{
93 struct branch *b = insnbuf;
94 unsigned long delta = (unsigned long)target - (addr+5);
95
96 if (tgt_clobbers & ~site_clobbers)
97 return len; /* target would clobber too much for this site */
98 if (len < 5)
99 return len; /* call too long for patch site */
100
101 b->opcode = 0xe8; /* call */
102 b->delta = delta;
103 BUILD_BUG_ON(sizeof(*b) != 5);
104
105 return 5;
106}
107
108unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
109 unsigned long addr, unsigned len)
110{
111 struct branch *b = insnbuf;
112 unsigned long delta = (unsigned long)target - (addr+5);
113
114 if (len < 5)
115 return len; /* call too long for patch site */
116
117 b->opcode = 0xe9; /* jmp */
118 b->delta = delta;
119
120 return 5;
121}
122
123/* Neat trick to map patch type back to the call within the
124 * corresponding structure. */
125static void *get_call_destination(u8 type)
126{
127 struct paravirt_patch_template tmpl = {
128 .pv_init_ops = pv_init_ops,
129 .pv_time_ops = pv_time_ops,
130 .pv_cpu_ops = pv_cpu_ops,
131 .pv_irq_ops = pv_irq_ops,
132 .pv_apic_ops = pv_apic_ops,
133 .pv_mmu_ops = pv_mmu_ops,
134#ifdef CONFIG_PARAVIRT_SPINLOCKS
135 .pv_lock_ops = pv_lock_ops,
136#endif
137 };
138 return *((void **)&tmpl + type);
139}
140
141unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
142 unsigned long addr, unsigned len)
143{
144 void *opfunc = get_call_destination(type);
145 unsigned ret;
146
147 if (opfunc == NULL)
148 /* If there's no function, patch it with a ud2a (BUG) */
149 ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
150 else if (opfunc == _paravirt_nop)
151 /* If the operation is a nop, then nop the callsite */
152 ret = paravirt_patch_nop();
153
154 /* identity functions just return their single argument */
155 else if (opfunc == _paravirt_ident_32)
156 ret = paravirt_patch_ident_32(insnbuf, len);
157 else if (opfunc == _paravirt_ident_64)
158 ret = paravirt_patch_ident_64(insnbuf, len);
159
160 else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
161 type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_sysexit) ||
162 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret32) ||
163 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
164 /* If operation requires a jmp, then jmp */
165 ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
166 else
167 /* Otherwise call the function; assume target could
168 clobber any caller-save reg */
169 ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
170 addr, clobbers, len);
171
172 return ret;
173}
174
175unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
176 const char *start, const char *end)
177{
178 unsigned insn_len = end - start;
179
180 if (insn_len > len || start == NULL)
181 insn_len = len;
182 else
183 memcpy(insnbuf, start, insn_len);
184
185 return insn_len;
186}
187
188static void native_flush_tlb(void)
189{
190 __native_flush_tlb();
191}
192
193/*
194 * Global pages have to be flushed a bit differently. Not a real
195 * performance problem because this does not happen often.
196 */
197static void native_flush_tlb_global(void)
198{
199 __native_flush_tlb_global();
200}
201
202static void native_flush_tlb_single(unsigned long addr)
203{
204 __native_flush_tlb_single(addr);
205}
206
207struct static_key paravirt_steal_enabled;
208struct static_key paravirt_steal_rq_enabled;
209
210static u64 native_steal_clock(int cpu)
211{
212 return 0;
213}
214
215/* These are in entry.S */
216extern void native_iret(void);
217extern void native_irq_enable_sysexit(void);
218extern void native_usergs_sysret32(void);
219extern void native_usergs_sysret64(void);
220
221static struct resource reserve_ioports = {
222 .start = 0,
223 .end = IO_SPACE_LIMIT,
224 .name = "paravirt-ioport",
225 .flags = IORESOURCE_IO | IORESOURCE_BUSY,
226};
227
228/*
229 * Reserve the whole legacy IO space to prevent any legacy drivers
230 * from wasting time probing for their hardware. This is a fairly
231 * brute-force approach to disabling all non-virtual drivers.
232 *
233 * Note that this must be called very early to have any effect.
234 */
235int paravirt_disable_iospace(void)
236{
237 return request_resource(&ioport_resource, &reserve_ioports);
238}
239
240static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
241
242static inline void enter_lazy(enum paravirt_lazy_mode mode)
243{
244 BUG_ON(this_cpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
245
246 this_cpu_write(paravirt_lazy_mode, mode);
247}
248
249static void leave_lazy(enum paravirt_lazy_mode mode)
250{
251 BUG_ON(this_cpu_read(paravirt_lazy_mode) != mode);
252
253 this_cpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
254}
255
256void paravirt_enter_lazy_mmu(void)
257{
258 enter_lazy(PARAVIRT_LAZY_MMU);
259}
260
261void paravirt_leave_lazy_mmu(void)
262{
263 leave_lazy(PARAVIRT_LAZY_MMU);
264}
265
266void paravirt_start_context_switch(struct task_struct *prev)
267{
268 BUG_ON(preemptible());
269
270 if (this_cpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
271 arch_leave_lazy_mmu_mode();
272 set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
273 }
274 enter_lazy(PARAVIRT_LAZY_CPU);
275}
276
277void paravirt_end_context_switch(struct task_struct *next)
278{
279 BUG_ON(preemptible());
280
281 leave_lazy(PARAVIRT_LAZY_CPU);
282
283 if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
284 arch_enter_lazy_mmu_mode();
285}
286
287enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
288{
289 if (in_interrupt())
290 return PARAVIRT_LAZY_NONE;
291
292 return this_cpu_read(paravirt_lazy_mode);
293}
294
295void arch_flush_lazy_mmu_mode(void)
296{
297 preempt_disable();
298
299 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
300 arch_leave_lazy_mmu_mode();
301 arch_enter_lazy_mmu_mode();
302 }
303
304 preempt_enable();
305}
306
307struct pv_info pv_info = {
308 .name = "bare hardware",
309 .paravirt_enabled = 0,
310 .kernel_rpl = 0,
311 .shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
312
313#ifdef CONFIG_X86_64
314 .extra_user_64bit_cs = __USER_CS,
315#endif
316};
317
318struct pv_init_ops pv_init_ops = {
319 .patch = native_patch,
320};
321
322struct pv_time_ops pv_time_ops = {
323 .sched_clock = native_sched_clock,
324 .steal_clock = native_steal_clock,
325};
326
327struct pv_irq_ops pv_irq_ops = {
328 .save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
329 .restore_fl = __PV_IS_CALLEE_SAVE(native_restore_fl),
330 .irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
331 .irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
332 .safe_halt = native_safe_halt,
333 .halt = native_halt,
334#ifdef CONFIG_X86_64
335 .adjust_exception_frame = paravirt_nop,
336#endif
337};
338
339struct pv_cpu_ops pv_cpu_ops = {
340 .cpuid = native_cpuid,
341 .get_debugreg = native_get_debugreg,
342 .set_debugreg = native_set_debugreg,
343 .clts = native_clts,
344 .read_cr0 = native_read_cr0,
345 .write_cr0 = native_write_cr0,
346 .read_cr4 = native_read_cr4,
347 .read_cr4_safe = native_read_cr4_safe,
348 .write_cr4 = native_write_cr4,
349#ifdef CONFIG_X86_64
350 .read_cr8 = native_read_cr8,
351 .write_cr8 = native_write_cr8,
352#endif
353 .wbinvd = native_wbinvd,
354 .read_msr = native_read_msr_safe,
355 .rdmsr_regs = native_rdmsr_safe_regs,
356 .write_msr = native_write_msr_safe,
357 .wrmsr_regs = native_wrmsr_safe_regs,
358 .read_tsc = native_read_tsc,
359 .read_pmc = native_read_pmc,
360 .read_tscp = native_read_tscp,
361 .load_tr_desc = native_load_tr_desc,
362 .set_ldt = native_set_ldt,
363 .load_gdt = native_load_gdt,
364 .load_idt = native_load_idt,
365 .store_gdt = native_store_gdt,
366 .store_idt = native_store_idt,
367 .store_tr = native_store_tr,
368 .load_tls = native_load_tls,
369#ifdef CONFIG_X86_64
370 .load_gs_index = native_load_gs_index,
371#endif
372 .write_ldt_entry = native_write_ldt_entry,
373 .write_gdt_entry = native_write_gdt_entry,
374 .write_idt_entry = native_write_idt_entry,
375
376 .alloc_ldt = paravirt_nop,
377 .free_ldt = paravirt_nop,
378
379 .load_sp0 = native_load_sp0,
380
381#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
382 .irq_enable_sysexit = native_irq_enable_sysexit,
383#endif
384#ifdef CONFIG_X86_64
385#ifdef CONFIG_IA32_EMULATION
386 .usergs_sysret32 = native_usergs_sysret32,
387#endif
388 .usergs_sysret64 = native_usergs_sysret64,
389#endif
390 .iret = native_iret,
391 .swapgs = native_swapgs,
392
393 .set_iopl_mask = native_set_iopl_mask,
394 .io_delay = native_io_delay,
395
396 .start_context_switch = paravirt_nop,
397 .end_context_switch = paravirt_nop,
398};
399
400struct pv_apic_ops pv_apic_ops = {
401#ifdef CONFIG_X86_LOCAL_APIC
402 .startup_ipi_hook = paravirt_nop,
403#endif
404};
405
406#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
407/* 32-bit pagetable entries */
408#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_32)
409#else
410/* 64-bit pagetable entries */
411#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
412#endif
413
414struct pv_mmu_ops pv_mmu_ops = {
415
416 .read_cr2 = native_read_cr2,
417 .write_cr2 = native_write_cr2,
418 .read_cr3 = native_read_cr3,
419 .write_cr3 = native_write_cr3,
420
421 .flush_tlb_user = native_flush_tlb,
422 .flush_tlb_kernel = native_flush_tlb_global,
423 .flush_tlb_single = native_flush_tlb_single,
424 .flush_tlb_others = native_flush_tlb_others,
425
426 .pgd_alloc = __paravirt_pgd_alloc,
427 .pgd_free = paravirt_nop,
428
429 .alloc_pte = paravirt_nop,
430 .alloc_pmd = paravirt_nop,
431 .alloc_pud = paravirt_nop,
432 .release_pte = paravirt_nop,
433 .release_pmd = paravirt_nop,
434 .release_pud = paravirt_nop,
435
436 .set_pte = native_set_pte,
437 .set_pte_at = native_set_pte_at,
438 .set_pmd = native_set_pmd,
439 .set_pmd_at = native_set_pmd_at,
440 .pte_update = paravirt_nop,
441 .pte_update_defer = paravirt_nop,
442 .pmd_update = paravirt_nop,
443 .pmd_update_defer = paravirt_nop,
444
445 .ptep_modify_prot_start = __ptep_modify_prot_start,
446 .ptep_modify_prot_commit = __ptep_modify_prot_commit,
447
448#if PAGETABLE_LEVELS >= 3
449#ifdef CONFIG_X86_PAE
450 .set_pte_atomic = native_set_pte_atomic,
451 .pte_clear = native_pte_clear,
452 .pmd_clear = native_pmd_clear,
453#endif
454 .set_pud = native_set_pud,
455
456 .pmd_val = PTE_IDENT,
457 .make_pmd = PTE_IDENT,
458
459#if PAGETABLE_LEVELS == 4
460 .pud_val = PTE_IDENT,
461 .make_pud = PTE_IDENT,
462
463 .set_pgd = native_set_pgd,
464#endif
465#endif /* PAGETABLE_LEVELS >= 3 */
466
467 .pte_val = PTE_IDENT,
468 .pgd_val = PTE_IDENT,
469
470 .make_pte = PTE_IDENT,
471 .make_pgd = PTE_IDENT,
472
473 .dup_mmap = paravirt_nop,
474 .exit_mmap = paravirt_nop,
475 .activate_mm = paravirt_nop,
476
477 .lazy_mode = {
478 .enter = paravirt_nop,
479 .leave = paravirt_nop,
480 },
481
482 .set_fixmap = native_set_fixmap,
483};
484
485EXPORT_SYMBOL_GPL(pv_time_ops);
486EXPORT_SYMBOL (pv_cpu_ops);
487EXPORT_SYMBOL (pv_mmu_ops);
488EXPORT_SYMBOL_GPL(pv_apic_ops);
489EXPORT_SYMBOL_GPL(pv_info);
490EXPORT_SYMBOL (pv_irq_ops);
1/* Paravirtualization interfaces
2 Copyright (C) 2006 Rusty Russell IBM Corporation
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17
18 2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
19*/
20
21#include <linux/errno.h>
22#include <linux/init.h>
23#include <linux/export.h>
24#include <linux/efi.h>
25#include <linux/bcd.h>
26#include <linux/highmem.h>
27#include <linux/kprobes.h>
28
29#include <asm/bug.h>
30#include <asm/paravirt.h>
31#include <asm/debugreg.h>
32#include <asm/desc.h>
33#include <asm/setup.h>
34#include <asm/pgtable.h>
35#include <asm/time.h>
36#include <asm/pgalloc.h>
37#include <asm/irq.h>
38#include <asm/delay.h>
39#include <asm/fixmap.h>
40#include <asm/apic.h>
41#include <asm/tlbflush.h>
42#include <asm/timer.h>
43#include <asm/special_insns.h>
44
45/*
46 * nop stub, which must not clobber anything *including the stack* to
47 * avoid confusing the entry prologues.
48 */
49extern void _paravirt_nop(void);
50asm (".pushsection .entry.text, \"ax\"\n"
51 ".global _paravirt_nop\n"
52 "_paravirt_nop:\n\t"
53 "ret\n\t"
54 ".size _paravirt_nop, . - _paravirt_nop\n\t"
55 ".type _paravirt_nop, @function\n\t"
56 ".popsection");
57
58/* identity function, which can be inlined */
59u32 notrace _paravirt_ident_32(u32 x)
60{
61 return x;
62}
63
64u64 notrace _paravirt_ident_64(u64 x)
65{
66 return x;
67}
68
69void __init default_banner(void)
70{
71 printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
72 pv_info.name);
73}
74
75/* Undefined instruction for dealing with missing ops pointers. */
76static const unsigned char ud2a[] = { 0x0f, 0x0b };
77
78struct branch {
79 unsigned char opcode;
80 u32 delta;
81} __attribute__((packed));
82
83unsigned paravirt_patch_call(void *insnbuf,
84 const void *target, u16 tgt_clobbers,
85 unsigned long addr, u16 site_clobbers,
86 unsigned len)
87{
88 struct branch *b = insnbuf;
89 unsigned long delta = (unsigned long)target - (addr+5);
90
91 if (tgt_clobbers & ~site_clobbers)
92 return len; /* target would clobber too much for this site */
93 if (len < 5)
94 return len; /* call too long for patch site */
95
96 b->opcode = 0xe8; /* call */
97 b->delta = delta;
98 BUILD_BUG_ON(sizeof(*b) != 5);
99
100 return 5;
101}
102
103unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
104 unsigned long addr, unsigned len)
105{
106 struct branch *b = insnbuf;
107 unsigned long delta = (unsigned long)target - (addr+5);
108
109 if (len < 5)
110 return len; /* call too long for patch site */
111
112 b->opcode = 0xe9; /* jmp */
113 b->delta = delta;
114
115 return 5;
116}
117
118/* Neat trick to map patch type back to the call within the
119 * corresponding structure. */
120static void *get_call_destination(u8 type)
121{
122 struct paravirt_patch_template tmpl = {
123 .pv_init_ops = pv_init_ops,
124 .pv_time_ops = pv_time_ops,
125 .pv_cpu_ops = pv_cpu_ops,
126 .pv_irq_ops = pv_irq_ops,
127 .pv_mmu_ops = pv_mmu_ops,
128#ifdef CONFIG_PARAVIRT_SPINLOCKS
129 .pv_lock_ops = pv_lock_ops,
130#endif
131 };
132 return *((void **)&tmpl + type);
133}
134
135unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
136 unsigned long addr, unsigned len)
137{
138 void *opfunc = get_call_destination(type);
139 unsigned ret;
140
141 if (opfunc == NULL)
142 /* If there's no function, patch it with a ud2a (BUG) */
143 ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a));
144 else if (opfunc == _paravirt_nop)
145 ret = 0;
146
147 /* identity functions just return their single argument */
148 else if (opfunc == _paravirt_ident_32)
149 ret = paravirt_patch_ident_32(insnbuf, len);
150 else if (opfunc == _paravirt_ident_64)
151 ret = paravirt_patch_ident_64(insnbuf, len);
152
153 else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) ||
154 type == PARAVIRT_PATCH(pv_cpu_ops.usergs_sysret64))
155 /* If operation requires a jmp, then jmp */
156 ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
157 else
158 /* Otherwise call the function; assume target could
159 clobber any caller-save reg */
160 ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
161 addr, clobbers, len);
162
163 return ret;
164}
165
166unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
167 const char *start, const char *end)
168{
169 unsigned insn_len = end - start;
170
171 if (insn_len > len || start == NULL)
172 insn_len = len;
173 else
174 memcpy(insnbuf, start, insn_len);
175
176 return insn_len;
177}
178
179static void native_flush_tlb(void)
180{
181 __native_flush_tlb();
182}
183
184/*
185 * Global pages have to be flushed a bit differently. Not a real
186 * performance problem because this does not happen often.
187 */
188static void native_flush_tlb_global(void)
189{
190 __native_flush_tlb_global();
191}
192
193static void native_flush_tlb_single(unsigned long addr)
194{
195 __native_flush_tlb_single(addr);
196}
197
198struct static_key paravirt_steal_enabled;
199struct static_key paravirt_steal_rq_enabled;
200
201static u64 native_steal_clock(int cpu)
202{
203 return 0;
204}
205
206/* These are in entry.S */
207extern void native_iret(void);
208extern void native_usergs_sysret64(void);
209
210static struct resource reserve_ioports = {
211 .start = 0,
212 .end = IO_SPACE_LIMIT,
213 .name = "paravirt-ioport",
214 .flags = IORESOURCE_IO | IORESOURCE_BUSY,
215};
216
217/*
218 * Reserve the whole legacy IO space to prevent any legacy drivers
219 * from wasting time probing for their hardware. This is a fairly
220 * brute-force approach to disabling all non-virtual drivers.
221 *
222 * Note that this must be called very early to have any effect.
223 */
224int paravirt_disable_iospace(void)
225{
226 return request_resource(&ioport_resource, &reserve_ioports);
227}
228
229static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
230
231static inline void enter_lazy(enum paravirt_lazy_mode mode)
232{
233 BUG_ON(this_cpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
234
235 this_cpu_write(paravirt_lazy_mode, mode);
236}
237
238static void leave_lazy(enum paravirt_lazy_mode mode)
239{
240 BUG_ON(this_cpu_read(paravirt_lazy_mode) != mode);
241
242 this_cpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
243}
244
245void paravirt_enter_lazy_mmu(void)
246{
247 enter_lazy(PARAVIRT_LAZY_MMU);
248}
249
250void paravirt_leave_lazy_mmu(void)
251{
252 leave_lazy(PARAVIRT_LAZY_MMU);
253}
254
255void paravirt_flush_lazy_mmu(void)
256{
257 preempt_disable();
258
259 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
260 arch_leave_lazy_mmu_mode();
261 arch_enter_lazy_mmu_mode();
262 }
263
264 preempt_enable();
265}
266
267void paravirt_start_context_switch(struct task_struct *prev)
268{
269 BUG_ON(preemptible());
270
271 if (this_cpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
272 arch_leave_lazy_mmu_mode();
273 set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
274 }
275 enter_lazy(PARAVIRT_LAZY_CPU);
276}
277
278void paravirt_end_context_switch(struct task_struct *next)
279{
280 BUG_ON(preemptible());
281
282 leave_lazy(PARAVIRT_LAZY_CPU);
283
284 if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
285 arch_enter_lazy_mmu_mode();
286}
287
288enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
289{
290 if (in_interrupt())
291 return PARAVIRT_LAZY_NONE;
292
293 return this_cpu_read(paravirt_lazy_mode);
294}
295
296struct pv_info pv_info = {
297 .name = "bare hardware",
298 .kernel_rpl = 0,
299 .shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */
300
301#ifdef CONFIG_X86_64
302 .extra_user_64bit_cs = __USER_CS,
303#endif
304};
305
306struct pv_init_ops pv_init_ops = {
307 .patch = native_patch,
308};
309
310struct pv_time_ops pv_time_ops = {
311 .sched_clock = native_sched_clock,
312 .steal_clock = native_steal_clock,
313};
314
315__visible struct pv_irq_ops pv_irq_ops = {
316 .save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
317 .restore_fl = __PV_IS_CALLEE_SAVE(native_restore_fl),
318 .irq_disable = __PV_IS_CALLEE_SAVE(native_irq_disable),
319 .irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
320 .safe_halt = native_safe_halt,
321 .halt = native_halt,
322#ifdef CONFIG_X86_64
323 .adjust_exception_frame = paravirt_nop,
324#endif
325};
326
327__visible struct pv_cpu_ops pv_cpu_ops = {
328 .cpuid = native_cpuid,
329 .get_debugreg = native_get_debugreg,
330 .set_debugreg = native_set_debugreg,
331 .read_cr0 = native_read_cr0,
332 .write_cr0 = native_write_cr0,
333 .read_cr4 = native_read_cr4,
334 .write_cr4 = native_write_cr4,
335#ifdef CONFIG_X86_64
336 .read_cr8 = native_read_cr8,
337 .write_cr8 = native_write_cr8,
338#endif
339 .wbinvd = native_wbinvd,
340 .read_msr = native_read_msr,
341 .write_msr = native_write_msr,
342 .read_msr_safe = native_read_msr_safe,
343 .write_msr_safe = native_write_msr_safe,
344 .read_pmc = native_read_pmc,
345 .load_tr_desc = native_load_tr_desc,
346 .set_ldt = native_set_ldt,
347 .load_gdt = native_load_gdt,
348 .load_idt = native_load_idt,
349 .store_idt = native_store_idt,
350 .store_tr = native_store_tr,
351 .load_tls = native_load_tls,
352#ifdef CONFIG_X86_64
353 .load_gs_index = native_load_gs_index,
354#endif
355 .write_ldt_entry = native_write_ldt_entry,
356 .write_gdt_entry = native_write_gdt_entry,
357 .write_idt_entry = native_write_idt_entry,
358
359 .alloc_ldt = paravirt_nop,
360 .free_ldt = paravirt_nop,
361
362 .load_sp0 = native_load_sp0,
363
364#ifdef CONFIG_X86_64
365 .usergs_sysret64 = native_usergs_sysret64,
366#endif
367 .iret = native_iret,
368 .swapgs = native_swapgs,
369
370 .set_iopl_mask = native_set_iopl_mask,
371 .io_delay = native_io_delay,
372
373 .start_context_switch = paravirt_nop,
374 .end_context_switch = paravirt_nop,
375};
376
377/* At this point, native_get/set_debugreg has real function entries */
378NOKPROBE_SYMBOL(native_get_debugreg);
379NOKPROBE_SYMBOL(native_set_debugreg);
380NOKPROBE_SYMBOL(native_load_idt);
381
382#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_PAE)
383/* 32-bit pagetable entries */
384#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_32)
385#else
386/* 64-bit pagetable entries */
387#define PTE_IDENT __PV_IS_CALLEE_SAVE(_paravirt_ident_64)
388#endif
389
390struct pv_mmu_ops pv_mmu_ops __ro_after_init = {
391
392 .read_cr2 = native_read_cr2,
393 .write_cr2 = native_write_cr2,
394 .read_cr3 = native_read_cr3,
395 .write_cr3 = native_write_cr3,
396
397 .flush_tlb_user = native_flush_tlb,
398 .flush_tlb_kernel = native_flush_tlb_global,
399 .flush_tlb_single = native_flush_tlb_single,
400 .flush_tlb_others = native_flush_tlb_others,
401
402 .pgd_alloc = __paravirt_pgd_alloc,
403 .pgd_free = paravirt_nop,
404
405 .alloc_pte = paravirt_nop,
406 .alloc_pmd = paravirt_nop,
407 .alloc_pud = paravirt_nop,
408 .release_pte = paravirt_nop,
409 .release_pmd = paravirt_nop,
410 .release_pud = paravirt_nop,
411
412 .set_pte = native_set_pte,
413 .set_pte_at = native_set_pte_at,
414 .set_pmd = native_set_pmd,
415 .set_pmd_at = native_set_pmd_at,
416 .pte_update = paravirt_nop,
417
418 .ptep_modify_prot_start = __ptep_modify_prot_start,
419 .ptep_modify_prot_commit = __ptep_modify_prot_commit,
420
421#if CONFIG_PGTABLE_LEVELS >= 3
422#ifdef CONFIG_X86_PAE
423 .set_pte_atomic = native_set_pte_atomic,
424 .pte_clear = native_pte_clear,
425 .pmd_clear = native_pmd_clear,
426#endif
427 .set_pud = native_set_pud,
428
429 .pmd_val = PTE_IDENT,
430 .make_pmd = PTE_IDENT,
431
432#if CONFIG_PGTABLE_LEVELS == 4
433 .pud_val = PTE_IDENT,
434 .make_pud = PTE_IDENT,
435
436 .set_pgd = native_set_pgd,
437#endif
438#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
439
440 .pte_val = PTE_IDENT,
441 .pgd_val = PTE_IDENT,
442
443 .make_pte = PTE_IDENT,
444 .make_pgd = PTE_IDENT,
445
446 .dup_mmap = paravirt_nop,
447 .exit_mmap = paravirt_nop,
448 .activate_mm = paravirt_nop,
449
450 .lazy_mode = {
451 .enter = paravirt_nop,
452 .leave = paravirt_nop,
453 .flush = paravirt_nop,
454 },
455
456 .set_fixmap = native_set_fixmap,
457};
458
459EXPORT_SYMBOL_GPL(pv_time_ops);
460EXPORT_SYMBOL (pv_cpu_ops);
461EXPORT_SYMBOL (pv_mmu_ops);
462EXPORT_SYMBOL_GPL(pv_info);
463EXPORT_SYMBOL (pv_irq_ops);