Commit | Line | Data |
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d3561b7f RR |
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 | |
b1df07bd GOC |
17 | |
18 | 2007 - x86_64 support added by Glauber de Oliveira Costa, Red Hat Inc | |
d3561b7f | 19 | */ |
b1df07bd | 20 | |
d3561b7f RR |
21 | #include <linux/errno.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/efi.h> | |
24 | #include <linux/bcd.h> | |
ce6234b5 | 25 | #include <linux/highmem.h> |
d3561b7f RR |
26 | |
27 | #include <asm/bug.h> | |
28 | #include <asm/paravirt.h> | |
29 | #include <asm/desc.h> | |
30 | #include <asm/setup.h> | |
31 | #include <asm/arch_hooks.h> | |
32 | #include <asm/time.h> | |
33 | #include <asm/irq.h> | |
34 | #include <asm/delay.h> | |
13623d79 RR |
35 | #include <asm/fixmap.h> |
36 | #include <asm/apic.h> | |
da181a8b | 37 | #include <asm/tlbflush.h> |
6cb9a835 | 38 | #include <asm/timer.h> |
d3561b7f RR |
39 | |
40 | /* nop stub */ | |
45876233 | 41 | void _paravirt_nop(void) |
d3561b7f RR |
42 | { |
43 | } | |
44 | ||
45 | static void __init default_banner(void) | |
46 | { | |
47 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", | |
93b1eab3 | 48 | pv_info.name); |
d3561b7f RR |
49 | } |
50 | ||
51 | char *memory_setup(void) | |
52 | { | |
93b1eab3 | 53 | return pv_init_ops.memory_setup(); |
d3561b7f RR |
54 | } |
55 | ||
139ec7c4 | 56 | /* Simple instruction patching code. */ |
93b1eab3 JF |
57 | #define DEF_NATIVE(ops, name, code) \ |
58 | extern const char start_##ops##_##name[], end_##ops##_##name[]; \ | |
59 | asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":") | |
60 | ||
93b1eab3 JF |
61 | /* Undefined instruction for dealing with missing ops pointers. */ |
62 | static const unsigned char ud2a[] = { 0x0f, 0x0b }; | |
139ec7c4 | 63 | |
63f70270 JF |
64 | unsigned paravirt_patch_nop(void) |
65 | { | |
66 | return 0; | |
67 | } | |
68 | ||
69 | unsigned paravirt_patch_ignore(unsigned len) | |
70 | { | |
71 | return len; | |
72 | } | |
73 | ||
19d36ccd AK |
74 | struct branch { |
75 | unsigned char opcode; | |
76 | u32 delta; | |
77 | } __attribute__((packed)); | |
78 | ||
ab144f5e AK |
79 | unsigned paravirt_patch_call(void *insnbuf, |
80 | const void *target, u16 tgt_clobbers, | |
81 | unsigned long addr, u16 site_clobbers, | |
63f70270 JF |
82 | unsigned len) |
83 | { | |
ab144f5e AK |
84 | struct branch *b = insnbuf; |
85 | unsigned long delta = (unsigned long)target - (addr+5); | |
63f70270 JF |
86 | |
87 | if (tgt_clobbers & ~site_clobbers) | |
88 | return len; /* target would clobber too much for this site */ | |
89 | if (len < 5) | |
90 | return len; /* call too long for patch site */ | |
139ec7c4 | 91 | |
ab144f5e AK |
92 | b->opcode = 0xe8; /* call */ |
93 | b->delta = delta; | |
94 | BUILD_BUG_ON(sizeof(*b) != 5); | |
139ec7c4 | 95 | |
63f70270 JF |
96 | return 5; |
97 | } | |
98 | ||
93b1eab3 | 99 | unsigned paravirt_patch_jmp(void *insnbuf, const void *target, |
ab144f5e | 100 | unsigned long addr, unsigned len) |
63f70270 | 101 | { |
ab144f5e AK |
102 | struct branch *b = insnbuf; |
103 | unsigned long delta = (unsigned long)target - (addr+5); | |
63f70270 JF |
104 | |
105 | if (len < 5) | |
106 | return len; /* call too long for patch site */ | |
107 | ||
ab144f5e AK |
108 | b->opcode = 0xe9; /* jmp */ |
109 | b->delta = delta; | |
63f70270 JF |
110 | |
111 | return 5; | |
112 | } | |
113 | ||
93b1eab3 JF |
114 | /* Neat trick to map patch type back to the call within the |
115 | * corresponding structure. */ | |
116 | static void *get_call_destination(u8 type) | |
117 | { | |
118 | struct paravirt_patch_template tmpl = { | |
119 | .pv_init_ops = pv_init_ops, | |
93b1eab3 JF |
120 | .pv_time_ops = pv_time_ops, |
121 | .pv_cpu_ops = pv_cpu_ops, | |
122 | .pv_irq_ops = pv_irq_ops, | |
123 | .pv_apic_ops = pv_apic_ops, | |
124 | .pv_mmu_ops = pv_mmu_ops, | |
125 | }; | |
126 | return *((void **)&tmpl + type); | |
127 | } | |
128 | ||
ab144f5e AK |
129 | unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, |
130 | unsigned long addr, unsigned len) | |
63f70270 | 131 | { |
93b1eab3 | 132 | void *opfunc = get_call_destination(type); |
63f70270 JF |
133 | unsigned ret; |
134 | ||
135 | if (opfunc == NULL) | |
136 | /* If there's no function, patch it with a ud2a (BUG) */ | |
93b1eab3 | 137 | ret = paravirt_patch_insns(insnbuf, len, ud2a, ud2a+sizeof(ud2a)); |
63f70270 JF |
138 | else if (opfunc == paravirt_nop) |
139 | /* If the operation is a nop, then nop the callsite */ | |
140 | ret = paravirt_patch_nop(); | |
93b1eab3 | 141 | else if (type == PARAVIRT_PATCH(pv_cpu_ops.iret) || |
6abcd98f | 142 | type == PARAVIRT_PATCH(pv_cpu_ops.irq_enable_syscall_ret)) |
63f70270 | 143 | /* If operation requires a jmp, then jmp */ |
93b1eab3 | 144 | ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len); |
63f70270 JF |
145 | else |
146 | /* Otherwise call the function; assume target could | |
147 | clobber any caller-save reg */ | |
ab144f5e AK |
148 | ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY, |
149 | addr, clobbers, len); | |
63f70270 JF |
150 | |
151 | return ret; | |
152 | } | |
153 | ||
ab144f5e | 154 | unsigned paravirt_patch_insns(void *insnbuf, unsigned len, |
63f70270 JF |
155 | const char *start, const char *end) |
156 | { | |
157 | unsigned insn_len = end - start; | |
139ec7c4 | 158 | |
63f70270 JF |
159 | if (insn_len > len || start == NULL) |
160 | insn_len = len; | |
161 | else | |
ab144f5e | 162 | memcpy(insnbuf, start, insn_len); |
139ec7c4 | 163 | |
139ec7c4 RR |
164 | return insn_len; |
165 | } | |
166 | ||
d3561b7f RR |
167 | void init_IRQ(void) |
168 | { | |
93b1eab3 | 169 | pv_irq_ops.init_IRQ(); |
d3561b7f RR |
170 | } |
171 | ||
1a1eecd1 | 172 | static void native_flush_tlb(void) |
da181a8b RR |
173 | { |
174 | __native_flush_tlb(); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Global pages have to be flushed a bit differently. Not a real | |
179 | * performance problem because this does not happen often. | |
180 | */ | |
1a1eecd1 | 181 | static void native_flush_tlb_global(void) |
da181a8b RR |
182 | { |
183 | __native_flush_tlb_global(); | |
184 | } | |
185 | ||
63f70270 | 186 | static void native_flush_tlb_single(unsigned long addr) |
da181a8b RR |
187 | { |
188 | __native_flush_tlb_single(addr); | |
189 | } | |
190 | ||
d3561b7f | 191 | /* These are in entry.S */ |
1a1eecd1 | 192 | extern void native_iret(void); |
6abcd98f | 193 | extern void native_irq_enable_syscall_ret(void); |
d3561b7f RR |
194 | |
195 | static int __init print_banner(void) | |
196 | { | |
93b1eab3 | 197 | pv_init_ops.banner(); |
d3561b7f RR |
198 | return 0; |
199 | } | |
200 | core_initcall(print_banner); | |
201 | ||
d572929c JF |
202 | static struct resource reserve_ioports = { |
203 | .start = 0, | |
204 | .end = IO_SPACE_LIMIT, | |
205 | .name = "paravirt-ioport", | |
206 | .flags = IORESOURCE_IO | IORESOURCE_BUSY, | |
207 | }; | |
208 | ||
209 | static struct resource reserve_iomem = { | |
210 | .start = 0, | |
211 | .end = -1, | |
212 | .name = "paravirt-iomem", | |
213 | .flags = IORESOURCE_MEM | IORESOURCE_BUSY, | |
214 | }; | |
215 | ||
216 | /* | |
217 | * Reserve the whole legacy IO space to prevent any legacy drivers | |
218 | * from wasting time probing for their hardware. This is a fairly | |
219 | * brute-force approach to disabling all non-virtual drivers. | |
220 | * | |
221 | * Note that this must be called very early to have any effect. | |
222 | */ | |
223 | int paravirt_disable_iospace(void) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | ret = request_resource(&ioport_resource, &reserve_ioports); | |
228 | if (ret == 0) { | |
229 | ret = request_resource(&iomem_resource, &reserve_iomem); | |
230 | if (ret) | |
231 | release_resource(&reserve_ioports); | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
8965c1c0 JF |
237 | static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE; |
238 | ||
239 | static inline void enter_lazy(enum paravirt_lazy_mode mode) | |
240 | { | |
241 | BUG_ON(x86_read_percpu(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE); | |
242 | BUG_ON(preemptible()); | |
243 | ||
244 | x86_write_percpu(paravirt_lazy_mode, mode); | |
245 | } | |
246 | ||
247 | void paravirt_leave_lazy(enum paravirt_lazy_mode mode) | |
248 | { | |
249 | BUG_ON(x86_read_percpu(paravirt_lazy_mode) != mode); | |
250 | BUG_ON(preemptible()); | |
251 | ||
252 | x86_write_percpu(paravirt_lazy_mode, PARAVIRT_LAZY_NONE); | |
253 | } | |
254 | ||
255 | void paravirt_enter_lazy_mmu(void) | |
256 | { | |
257 | enter_lazy(PARAVIRT_LAZY_MMU); | |
258 | } | |
259 | ||
260 | void paravirt_leave_lazy_mmu(void) | |
261 | { | |
262 | paravirt_leave_lazy(PARAVIRT_LAZY_MMU); | |
263 | } | |
264 | ||
265 | void paravirt_enter_lazy_cpu(void) | |
266 | { | |
267 | enter_lazy(PARAVIRT_LAZY_CPU); | |
268 | } | |
269 | ||
270 | void paravirt_leave_lazy_cpu(void) | |
271 | { | |
272 | paravirt_leave_lazy(PARAVIRT_LAZY_CPU); | |
273 | } | |
274 | ||
275 | enum paravirt_lazy_mode paravirt_get_lazy_mode(void) | |
276 | { | |
277 | return x86_read_percpu(paravirt_lazy_mode); | |
278 | } | |
279 | ||
93b1eab3 | 280 | struct pv_info pv_info = { |
d3561b7f RR |
281 | .name = "bare hardware", |
282 | .paravirt_enabled = 0, | |
283 | .kernel_rpl = 0, | |
5311ab62 | 284 | .shared_kernel_pmd = 1, /* Only used when CONFIG_X86_PAE is set */ |
93b1eab3 | 285 | }; |
d3561b7f | 286 | |
93b1eab3 JF |
287 | struct pv_init_ops pv_init_ops = { |
288 | .patch = native_patch, | |
d3561b7f | 289 | .banner = default_banner, |
45876233 | 290 | .arch_setup = paravirt_nop, |
d3561b7f | 291 | .memory_setup = machine_specific_memory_setup, |
93b1eab3 JF |
292 | }; |
293 | ||
294 | struct pv_time_ops pv_time_ops = { | |
295 | .time_init = hpet_time_init, | |
d3561b7f RR |
296 | .get_wallclock = native_get_wallclock, |
297 | .set_wallclock = native_set_wallclock, | |
93b1eab3 JF |
298 | .sched_clock = native_sched_clock, |
299 | .get_cpu_khz = native_calculate_cpu_khz, | |
300 | }; | |
301 | ||
302 | struct pv_irq_ops pv_irq_ops = { | |
d3561b7f | 303 | .init_IRQ = native_init_IRQ, |
93b1eab3 JF |
304 | .save_fl = native_save_fl, |
305 | .restore_fl = native_restore_fl, | |
306 | .irq_disable = native_irq_disable, | |
307 | .irq_enable = native_irq_enable, | |
308 | .safe_halt = native_safe_halt, | |
309 | .halt = native_halt, | |
310 | }; | |
d3561b7f | 311 | |
93b1eab3 | 312 | struct pv_cpu_ops pv_cpu_ops = { |
d3561b7f RR |
313 | .cpuid = native_cpuid, |
314 | .get_debugreg = native_get_debugreg, | |
315 | .set_debugreg = native_set_debugreg, | |
316 | .clts = native_clts, | |
317 | .read_cr0 = native_read_cr0, | |
318 | .write_cr0 = native_write_cr0, | |
d3561b7f RR |
319 | .read_cr4 = native_read_cr4, |
320 | .read_cr4_safe = native_read_cr4_safe, | |
321 | .write_cr4 = native_write_cr4, | |
d3561b7f | 322 | .wbinvd = native_wbinvd, |
90a0a06a RR |
323 | .read_msr = native_read_msr_safe, |
324 | .write_msr = native_write_msr_safe, | |
d3561b7f RR |
325 | .read_tsc = native_read_tsc, |
326 | .read_pmc = native_read_pmc, | |
e5aaac44 | 327 | .read_tscp = native_read_tscp, |
d3561b7f RR |
328 | .load_tr_desc = native_load_tr_desc, |
329 | .set_ldt = native_set_ldt, | |
330 | .load_gdt = native_load_gdt, | |
331 | .load_idt = native_load_idt, | |
332 | .store_gdt = native_store_gdt, | |
333 | .store_idt = native_store_idt, | |
334 | .store_tr = native_store_tr, | |
335 | .load_tls = native_load_tls, | |
75b8bb3e | 336 | .write_ldt_entry = native_write_ldt_entry, |
014b15be | 337 | .write_gdt_entry = native_write_gdt_entry, |
8d947344 | 338 | .write_idt_entry = native_write_idt_entry, |
faca6227 | 339 | .load_sp0 = native_load_sp0, |
d3561b7f | 340 | |
6abcd98f | 341 | .irq_enable_syscall_ret = native_irq_enable_syscall_ret, |
93b1eab3 | 342 | .iret = native_iret, |
e801f864 | 343 | .swapgs = native_swapgs, |
93b1eab3 | 344 | |
d3561b7f RR |
345 | .set_iopl_mask = native_set_iopl_mask, |
346 | .io_delay = native_io_delay, | |
8965c1c0 JF |
347 | |
348 | .lazy_mode = { | |
349 | .enter = paravirt_nop, | |
350 | .leave = paravirt_nop, | |
351 | }, | |
93b1eab3 | 352 | }; |
d3561b7f | 353 | |
93b1eab3 | 354 | struct pv_apic_ops pv_apic_ops = { |
13623d79 RR |
355 | #ifdef CONFIG_X86_LOCAL_APIC |
356 | .apic_write = native_apic_write, | |
357 | .apic_write_atomic = native_apic_write_atomic, | |
358 | .apic_read = native_apic_read, | |
bbab4f3b ZA |
359 | .setup_boot_clock = setup_boot_APIC_clock, |
360 | .setup_secondary_clock = setup_secondary_APIC_clock, | |
0260c196 | 361 | .startup_ipi_hook = paravirt_nop, |
13623d79 | 362 | #endif |
93b1eab3 JF |
363 | }; |
364 | ||
93b1eab3 | 365 | struct pv_mmu_ops pv_mmu_ops = { |
b239fb25 JF |
366 | .pagetable_setup_start = native_pagetable_setup_start, |
367 | .pagetable_setup_done = native_pagetable_setup_done, | |
368 | ||
93b1eab3 JF |
369 | .read_cr2 = native_read_cr2, |
370 | .write_cr2 = native_write_cr2, | |
371 | .read_cr3 = native_read_cr3, | |
372 | .write_cr3 = native_write_cr3, | |
373 | ||
da181a8b RR |
374 | .flush_tlb_user = native_flush_tlb, |
375 | .flush_tlb_kernel = native_flush_tlb_global, | |
376 | .flush_tlb_single = native_flush_tlb_single, | |
d4c10477 | 377 | .flush_tlb_others = native_flush_tlb_others, |
da181a8b | 378 | |
45876233 JF |
379 | .alloc_pt = paravirt_nop, |
380 | .alloc_pd = paravirt_nop, | |
381 | .alloc_pd_clone = paravirt_nop, | |
382 | .release_pt = paravirt_nop, | |
383 | .release_pd = paravirt_nop, | |
c119ecce | 384 | |
da181a8b RR |
385 | .set_pte = native_set_pte, |
386 | .set_pte_at = native_set_pte_at, | |
387 | .set_pmd = native_set_pmd, | |
45876233 JF |
388 | .pte_update = paravirt_nop, |
389 | .pte_update_defer = paravirt_nop, | |
3dc494e8 | 390 | |
ce6234b5 JF |
391 | #ifdef CONFIG_HIGHPTE |
392 | .kmap_atomic_pte = kmap_atomic, | |
393 | #endif | |
394 | ||
da181a8b RR |
395 | #ifdef CONFIG_X86_PAE |
396 | .set_pte_atomic = native_set_pte_atomic, | |
397 | .set_pte_present = native_set_pte_present, | |
398 | .set_pud = native_set_pud, | |
399 | .pte_clear = native_pte_clear, | |
400 | .pmd_clear = native_pmd_clear, | |
3dc494e8 JF |
401 | |
402 | .pmd_val = native_pmd_val, | |
403 | .make_pmd = native_make_pmd, | |
da181a8b RR |
404 | #endif |
405 | ||
3dc494e8 JF |
406 | .pte_val = native_pte_val, |
407 | .pgd_val = native_pgd_val, | |
408 | ||
409 | .make_pte = native_make_pte, | |
410 | .make_pgd = native_make_pgd, | |
411 | ||
d6dd61c8 JF |
412 | .dup_mmap = paravirt_nop, |
413 | .exit_mmap = paravirt_nop, | |
414 | .activate_mm = paravirt_nop, | |
8965c1c0 JF |
415 | |
416 | .lazy_mode = { | |
417 | .enter = paravirt_nop, | |
418 | .leave = paravirt_nop, | |
419 | }, | |
d3561b7f | 420 | }; |
0dbe5a11 | 421 | |
93b1eab3 | 422 | EXPORT_SYMBOL_GPL(pv_time_ops); |
f97b8954 JF |
423 | EXPORT_SYMBOL (pv_cpu_ops); |
424 | EXPORT_SYMBOL (pv_mmu_ops); | |
93b1eab3 JF |
425 | EXPORT_SYMBOL_GPL(pv_apic_ops); |
426 | EXPORT_SYMBOL_GPL(pv_info); | |
427 | EXPORT_SYMBOL (pv_irq_ops); |