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);

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*  Paravirtualization interfaces
  3    Copyright (C) 2006 Rusty Russell IBM Corporation
  4
 
 
 
 
 
 
 
 
 
 
 
 
 
  5
  6    2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc
  7*/
  8
  9#include <linux/errno.h>
 10#include <linux/init.h>
 11#include <linux/export.h>
 12#include <linux/efi.h>
 13#include <linux/bcd.h>
 14#include <linux/highmem.h>
 15#include <linux/kprobes.h>
 16#include <linux/pgtable.h>
 17
 18#include <asm/bug.h>
 19#include <asm/paravirt.h>
 20#include <asm/debugreg.h>
 21#include <asm/desc.h>
 22#include <asm/setup.h>
 
 23#include <asm/time.h>
 24#include <asm/pgalloc.h>
 25#include <asm/irq.h>
 26#include <asm/delay.h>
 27#include <asm/fixmap.h>
 28#include <asm/apic.h>
 29#include <asm/tlbflush.h>
 30#include <asm/timer.h>
 31#include <asm/special_insns.h>
 32#include <asm/tlb.h>
 33#include <asm/io_bitmap.h>
 34
 35/*
 36 * nop stub, which must not clobber anything *including the stack* to
 37 * avoid confusing the entry prologues.
 38 */
 39extern void _paravirt_nop(void);
 40asm (".pushsection .entry.text, \"ax\"\n"
 41     ".global _paravirt_nop\n"
 42     "_paravirt_nop:\n\t"
 43     "ret\n\t"
 44     ".size _paravirt_nop, . - _paravirt_nop\n\t"
 45     ".type _paravirt_nop, @function\n\t"
 46     ".popsection");
 47
 
 
 
 
 
 
 
 
 
 
 
 48void __init default_banner(void)
 49{
 50	printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
 51	       pv_info.name);
 52}
 53
 54/* Undefined instruction for dealing with missing ops pointers. */
 55static const unsigned char ud2a[] = { 0x0f, 0x0b };
 56
 57struct branch {
 58	unsigned char opcode;
 59	u32 delta;
 60} __attribute__((packed));
 61
 62static unsigned paravirt_patch_call(void *insn_buff, const void *target,
 63				    unsigned long addr, unsigned len)
 
 
 64{
 65	const int call_len = 5;
 66	struct branch *b = insn_buff;
 67	unsigned long delta = (unsigned long)target - (addr+call_len);
 68
 69	if (len < call_len) {
 70		pr_warn("paravirt: Failed to patch indirect CALL at %ps\n", (void *)addr);
 71		/* Kernel might not be viable if patching fails, bail out: */
 72		BUG_ON(1);
 73	}
 74
 75	b->opcode = 0xe8; /* call */
 76	b->delta = delta;
 77	BUILD_BUG_ON(sizeof(*b) != call_len);
 78
 79	return call_len;
 80}
 81
 82#ifdef CONFIG_PARAVIRT_XXL
 83/* identity function, which can be inlined */
 84u64 notrace _paravirt_ident_64(u64 x)
 85{
 86	return x;
 87}
 88
 89static unsigned paravirt_patch_jmp(void *insn_buff, const void *target,
 90				   unsigned long addr, unsigned len)
 91{
 92	struct branch *b = insn_buff;
 93	unsigned long delta = (unsigned long)target - (addr+5);
 94
 95	if (len < 5) {
 96#ifdef CONFIG_RETPOLINE
 97		WARN_ONCE(1, "Failing to patch indirect JMP in %ps\n", (void *)addr);
 98#endif
 99		return len;	/* call too long for patch site */
100	}
101
102	b->opcode = 0xe9;	/* jmp */
103	b->delta = delta;
104
105	return 5;
106}
 
 
 
 
 
 
 
 
 
 
 
 
 
107#endif
108
109DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
110
111void __init native_pv_lock_init(void)
112{
113	if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
114		static_branch_disable(&virt_spin_lock_key);
115}
116
117unsigned paravirt_patch_default(u8 type, void *insn_buff,
118				unsigned long addr, unsigned len)
119{
120	/*
121	 * Neat trick to map patch type back to the call within the
122	 * corresponding structure.
123	 */
124	void *opfunc = *((void **)&pv_ops + type);
125	unsigned ret;
126
127	if (opfunc == NULL)
128		/* If there's no function, patch it with a ud2a (BUG) */
129		ret = paravirt_patch_insns(insn_buff, len, ud2a, ud2a+sizeof(ud2a));
130	else if (opfunc == _paravirt_nop)
131		ret = 0;
132
133#ifdef CONFIG_PARAVIRT_XXL
134	/* identity functions just return their single argument */
 
 
135	else if (opfunc == _paravirt_ident_64)
136		ret = paravirt_patch_ident_64(insn_buff, len);
137
138	else if (type == PARAVIRT_PATCH(cpu.iret) ||
139		 type == PARAVIRT_PATCH(cpu.usergs_sysret64))
140		/* If operation requires a jmp, then jmp */
141		ret = paravirt_patch_jmp(insn_buff, opfunc, addr, len);
142#endif
143	else
144		/* Otherwise call the function. */
145		ret = paravirt_patch_call(insn_buff, opfunc, addr, len);
 
 
146
147	return ret;
148}
149
150unsigned paravirt_patch_insns(void *insn_buff, unsigned len,
151			      const char *start, const char *end)
152{
153	unsigned insn_len = end - start;
154
155	/* Alternative instruction is too large for the patch site and we cannot continue: */
156	BUG_ON(insn_len > len || start == NULL);
 
 
157
158	memcpy(insn_buff, start, insn_len);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
159
160	return insn_len;
 
 
161}
162
163struct static_key paravirt_steal_enabled;
164struct static_key paravirt_steal_rq_enabled;
165
166static u64 native_steal_clock(int cpu)
167{
168	return 0;
169}
170
171/* These are in entry.S */
172extern void native_iret(void);
173extern void native_usergs_sysret64(void);
174
175static struct resource reserve_ioports = {
176	.start = 0,
177	.end = IO_SPACE_LIMIT,
178	.name = "paravirt-ioport",
179	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
180};
181
182/*
183 * Reserve the whole legacy IO space to prevent any legacy drivers
184 * from wasting time probing for their hardware.  This is a fairly
185 * brute-force approach to disabling all non-virtual drivers.
186 *
187 * Note that this must be called very early to have any effect.
188 */
189int paravirt_disable_iospace(void)
190{
191	return request_resource(&ioport_resource, &reserve_ioports);
192}
193
194static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
195
196static inline void enter_lazy(enum paravirt_lazy_mode mode)
197{
198	BUG_ON(this_cpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
199
200	this_cpu_write(paravirt_lazy_mode, mode);
201}
202
203static void leave_lazy(enum paravirt_lazy_mode mode)
204{
205	BUG_ON(this_cpu_read(paravirt_lazy_mode) != mode);
206
207	this_cpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
208}
209
210void paravirt_enter_lazy_mmu(void)
211{
212	enter_lazy(PARAVIRT_LAZY_MMU);
213}
214
215void paravirt_leave_lazy_mmu(void)
216{
217	leave_lazy(PARAVIRT_LAZY_MMU);
218}
219
220void paravirt_flush_lazy_mmu(void)
221{
222	preempt_disable();
223
224	if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
225		arch_leave_lazy_mmu_mode();
226		arch_enter_lazy_mmu_mode();
227	}
228
229	preempt_enable();
230}
231
232#ifdef CONFIG_PARAVIRT_XXL
233void paravirt_start_context_switch(struct task_struct *prev)
234{
235	BUG_ON(preemptible());
236
237	if (this_cpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
238		arch_leave_lazy_mmu_mode();
239		set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
240	}
241	enter_lazy(PARAVIRT_LAZY_CPU);
242}
243
244void paravirt_end_context_switch(struct task_struct *next)
245{
246	BUG_ON(preemptible());
247
248	leave_lazy(PARAVIRT_LAZY_CPU);
249
250	if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
251		arch_enter_lazy_mmu_mode();
252}
253#endif
254
255enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
256{
257	if (in_interrupt())
258		return PARAVIRT_LAZY_NONE;
259
260	return this_cpu_read(paravirt_lazy_mode);
261}
262
263struct pv_info pv_info = {
264	.name = "bare hardware",
265#ifdef CONFIG_PARAVIRT_XXL
266	.kernel_rpl = 0,
267	.shared_kernel_pmd = 1,	/* Only used when CONFIG_X86_PAE is set */
268
269#ifdef CONFIG_X86_64
270	.extra_user_64bit_cs = __USER_CS,
271#endif
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
272#endif
273};
274
275/* 64-bit pagetable entries */
276#define PTE_IDENT	__PV_IS_CALLEE_SAVE(_paravirt_ident_64)
277
278struct paravirt_patch_template pv_ops = {
279	/* Init ops. */
280	.init.patch		= native_patch,
281
282	/* Time ops. */
283	.time.sched_clock	= native_sched_clock,
284	.time.steal_clock	= native_steal_clock,
285
286	/* Cpu ops. */
287	.cpu.io_delay		= native_io_delay,
288
289#ifdef CONFIG_PARAVIRT_XXL
290	.cpu.cpuid		= native_cpuid,
291	.cpu.get_debugreg	= native_get_debugreg,
292	.cpu.set_debugreg	= native_set_debugreg,
293	.cpu.read_cr0		= native_read_cr0,
294	.cpu.write_cr0		= native_write_cr0,
295	.cpu.write_cr4		= native_write_cr4,
296	.cpu.wbinvd		= native_wbinvd,
297	.cpu.read_msr		= native_read_msr,
298	.cpu.write_msr		= native_write_msr,
299	.cpu.read_msr_safe	= native_read_msr_safe,
300	.cpu.write_msr_safe	= native_write_msr_safe,
301	.cpu.read_pmc		= native_read_pmc,
302	.cpu.load_tr_desc	= native_load_tr_desc,
303	.cpu.set_ldt		= native_set_ldt,
304	.cpu.load_gdt		= native_load_gdt,
305	.cpu.load_idt		= native_load_idt,
306	.cpu.store_tr		= native_store_tr,
307	.cpu.load_tls		= native_load_tls,
308#ifdef CONFIG_X86_64
309	.cpu.load_gs_index	= native_load_gs_index,
310#endif
311	.cpu.write_ldt_entry	= native_write_ldt_entry,
312	.cpu.write_gdt_entry	= native_write_gdt_entry,
313	.cpu.write_idt_entry	= native_write_idt_entry,
314
315	.cpu.alloc_ldt		= paravirt_nop,
316	.cpu.free_ldt		= paravirt_nop,
317
318	.cpu.load_sp0		= native_load_sp0,
319
320#ifdef CONFIG_X86_64
321	.cpu.usergs_sysret64	= native_usergs_sysret64,
322#endif
323	.cpu.iret		= native_iret,
324	.cpu.swapgs		= native_swapgs,
 
 
 
 
 
 
 
325
326#ifdef CONFIG_X86_IOPL_IOPERM
327	.cpu.invalidate_io_bitmap	= native_tss_invalidate_io_bitmap,
328	.cpu.update_io_bitmap		= native_tss_update_io_bitmap,
 
 
 
 
 
 
 
 
329#endif
330
331	.cpu.start_context_switch	= paravirt_nop,
332	.cpu.end_context_switch		= paravirt_nop,
333
334	/* Irq ops. */
335	.irq.save_fl		= __PV_IS_CALLEE_SAVE(native_save_fl),
336	.irq.restore_fl		= __PV_IS_CALLEE_SAVE(native_restore_fl),
337	.irq.irq_disable	= __PV_IS_CALLEE_SAVE(native_irq_disable),
338	.irq.irq_enable		= __PV_IS_CALLEE_SAVE(native_irq_enable),
339	.irq.safe_halt		= native_safe_halt,
340	.irq.halt		= native_halt,
341#endif /* CONFIG_PARAVIRT_XXL */
342
343	/* Mmu ops. */
344	.mmu.flush_tlb_user	= native_flush_tlb_local,
345	.mmu.flush_tlb_kernel	= native_flush_tlb_global,
346	.mmu.flush_tlb_one_user	= native_flush_tlb_one_user,
347	.mmu.flush_tlb_others	= native_flush_tlb_others,
348	.mmu.tlb_remove_table	=
349			(void (*)(struct mmu_gather *, void *))tlb_remove_page,
350
351	.mmu.exit_mmap		= paravirt_nop,
352
353#ifdef CONFIG_PARAVIRT_XXL
354	.mmu.read_cr2		= __PV_IS_CALLEE_SAVE(native_read_cr2),
355	.mmu.write_cr2		= native_write_cr2,
356	.mmu.read_cr3		= __native_read_cr3,
357	.mmu.write_cr3		= native_write_cr3,
358
359	.mmu.pgd_alloc		= __paravirt_pgd_alloc,
360	.mmu.pgd_free		= paravirt_nop,
361
362	.mmu.alloc_pte		= paravirt_nop,
363	.mmu.alloc_pmd		= paravirt_nop,
364	.mmu.alloc_pud		= paravirt_nop,
365	.mmu.alloc_p4d		= paravirt_nop,
366	.mmu.release_pte	= paravirt_nop,
367	.mmu.release_pmd	= paravirt_nop,
368	.mmu.release_pud	= paravirt_nop,
369	.mmu.release_p4d	= paravirt_nop,
370
371	.mmu.set_pte		= native_set_pte,
372	.mmu.set_pte_at		= native_set_pte_at,
373	.mmu.set_pmd		= native_set_pmd,
374
375	.mmu.ptep_modify_prot_start	= __ptep_modify_prot_start,
376	.mmu.ptep_modify_prot_commit	= __ptep_modify_prot_commit,
377
378#if CONFIG_PGTABLE_LEVELS >= 3
379#ifdef CONFIG_X86_PAE
380	.mmu.set_pte_atomic	= native_set_pte_atomic,
381	.mmu.pte_clear		= native_pte_clear,
382	.mmu.pmd_clear		= native_pmd_clear,
383#endif
384	.mmu.set_pud		= native_set_pud,
385
386	.mmu.pmd_val		= PTE_IDENT,
387	.mmu.make_pmd		= PTE_IDENT,
388
389#if CONFIG_PGTABLE_LEVELS >= 4
390	.mmu.pud_val		= PTE_IDENT,
391	.mmu.make_pud		= PTE_IDENT,
392
393	.mmu.set_p4d		= native_set_p4d,
394
395#if CONFIG_PGTABLE_LEVELS >= 5
396	.mmu.p4d_val		= PTE_IDENT,
397	.mmu.make_p4d		= PTE_IDENT,
398
399	.mmu.set_pgd		= native_set_pgd,
400#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
401#endif /* CONFIG_PGTABLE_LEVELS >= 4 */
402#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
403
404	.mmu.pte_val		= PTE_IDENT,
405	.mmu.pgd_val		= PTE_IDENT,
406
407	.mmu.make_pte		= PTE_IDENT,
408	.mmu.make_pgd		= PTE_IDENT,
409
410	.mmu.dup_mmap		= paravirt_nop,
411	.mmu.activate_mm	= paravirt_nop,
412
413	.mmu.lazy_mode = {
414		.enter		= paravirt_nop,
415		.leave		= paravirt_nop,
416		.flush		= paravirt_nop,
 
417	},
418
419	.mmu.set_fixmap		= native_set_fixmap,
420#endif /* CONFIG_PARAVIRT_XXL */
421
422#if defined(CONFIG_PARAVIRT_SPINLOCKS)
423	/* Lock ops. */
424#ifdef CONFIG_SMP
425	.lock.queued_spin_lock_slowpath	= native_queued_spin_lock_slowpath,
426	.lock.queued_spin_unlock	=
427				PV_CALLEE_SAVE(__native_queued_spin_unlock),
428	.lock.wait			= paravirt_nop,
429	.lock.kick			= paravirt_nop,
430	.lock.vcpu_is_preempted		=
431				PV_CALLEE_SAVE(__native_vcpu_is_preempted),
432#endif /* SMP */
433#endif
434};
435
436#ifdef CONFIG_PARAVIRT_XXL
437/* At this point, native_get/set_debugreg has real function entries */
438NOKPROBE_SYMBOL(native_get_debugreg);
439NOKPROBE_SYMBOL(native_set_debugreg);
440NOKPROBE_SYMBOL(native_load_idt);
441#endif
442
443EXPORT_SYMBOL(pv_ops);
444EXPORT_SYMBOL_GPL(pv_info);