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