Commit | Line | Data |
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5ead97c8 JF |
1 | /* |
2 | * Core of Xen paravirt_ops implementation. | |
3 | * | |
4 | * This file contains the xen_paravirt_ops structure itself, and the | |
5 | * implementations for: | |
6 | * - privileged instructions | |
7 | * - interrupt flags | |
8 | * - segment operations | |
9 | * - booting and setup | |
10 | * | |
11 | * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007 | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/preempt.h> | |
f120f13e | 18 | #include <linux/hardirq.h> |
5ead97c8 JF |
19 | #include <linux/percpu.h> |
20 | #include <linux/delay.h> | |
21 | #include <linux/start_kernel.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/bootmem.h> | |
24 | #include <linux/module.h> | |
f4f97b3e JF |
25 | #include <linux/mm.h> |
26 | #include <linux/page-flags.h> | |
27 | #include <linux/highmem.h> | |
f87e4cac | 28 | #include <linux/smp.h> |
5ead97c8 JF |
29 | |
30 | #include <xen/interface/xen.h> | |
31 | #include <xen/interface/physdev.h> | |
32 | #include <xen/interface/vcpu.h> | |
fefa629a | 33 | #include <xen/interface/sched.h> |
5ead97c8 JF |
34 | #include <xen/features.h> |
35 | #include <xen/page.h> | |
36 | ||
37 | #include <asm/paravirt.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/xen/hypercall.h> | |
40 | #include <asm/xen/hypervisor.h> | |
41 | #include <asm/fixmap.h> | |
42 | #include <asm/processor.h> | |
43 | #include <asm/setup.h> | |
44 | #include <asm/desc.h> | |
45 | #include <asm/pgtable.h> | |
f87e4cac | 46 | #include <asm/tlbflush.h> |
fefa629a | 47 | #include <asm/reboot.h> |
5ead97c8 JF |
48 | |
49 | #include "xen-ops.h" | |
3b827c1b | 50 | #include "mmu.h" |
5ead97c8 JF |
51 | #include "multicalls.h" |
52 | ||
53 | EXPORT_SYMBOL_GPL(hypercall_page); | |
54 | ||
55 | DEFINE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode); | |
56 | ||
57 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); | |
58 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); | |
59 | DEFINE_PER_CPU(unsigned long, xen_cr3); | |
60 | ||
61 | struct start_info *xen_start_info; | |
62 | EXPORT_SYMBOL_GPL(xen_start_info); | |
63 | ||
60223a32 JF |
64 | static /* __initdata */ struct shared_info dummy_shared_info; |
65 | ||
66 | /* | |
67 | * Point at some empty memory to start with. We map the real shared_info | |
68 | * page as soon as fixmap is up and running. | |
69 | */ | |
70 | struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info; | |
71 | ||
72 | /* | |
73 | * Flag to determine whether vcpu info placement is available on all | |
74 | * VCPUs. We assume it is to start with, and then set it to zero on | |
75 | * the first failure. This is because it can succeed on some VCPUs | |
76 | * and not others, since it can involve hypervisor memory allocation, | |
77 | * or because the guest failed to guarantee all the appropriate | |
78 | * constraints on all VCPUs (ie buffer can't cross a page boundary). | |
79 | * | |
80 | * Note that any particular CPU may be using a placed vcpu structure, | |
81 | * but we can only optimise if the all are. | |
82 | * | |
83 | * 0: not available, 1: available | |
84 | */ | |
85 | static int have_vcpu_info_placement = 1; | |
86 | ||
87 | static void __init xen_vcpu_setup(int cpu) | |
5ead97c8 | 88 | { |
60223a32 JF |
89 | struct vcpu_register_vcpu_info info; |
90 | int err; | |
91 | struct vcpu_info *vcpup; | |
92 | ||
5ead97c8 | 93 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
60223a32 JF |
94 | |
95 | if (!have_vcpu_info_placement) | |
96 | return; /* already tested, not available */ | |
97 | ||
98 | vcpup = &per_cpu(xen_vcpu_info, cpu); | |
99 | ||
100 | info.mfn = virt_to_mfn(vcpup); | |
101 | info.offset = offset_in_page(vcpup); | |
102 | ||
103 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %x, offset %d\n", | |
104 | cpu, vcpup, info.mfn, info.offset); | |
105 | ||
106 | /* Check to see if the hypervisor will put the vcpu_info | |
107 | structure where we want it, which allows direct access via | |
108 | a percpu-variable. */ | |
109 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); | |
110 | ||
111 | if (err) { | |
112 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); | |
113 | have_vcpu_info_placement = 0; | |
114 | } else { | |
115 | /* This cpu is using the registered vcpu info, even if | |
116 | later ones fail to. */ | |
117 | per_cpu(xen_vcpu, cpu) = vcpup; | |
6487673b | 118 | |
60223a32 JF |
119 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
120 | cpu, vcpup); | |
121 | } | |
5ead97c8 JF |
122 | } |
123 | ||
124 | static void __init xen_banner(void) | |
125 | { | |
126 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", | |
93b1eab3 | 127 | pv_info.name); |
5ead97c8 JF |
128 | printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); |
129 | } | |
130 | ||
131 | static void xen_cpuid(unsigned int *eax, unsigned int *ebx, | |
132 | unsigned int *ecx, unsigned int *edx) | |
133 | { | |
134 | unsigned maskedx = ~0; | |
135 | ||
136 | /* | |
137 | * Mask out inconvenient features, to try and disable as many | |
138 | * unsupported kernel subsystems as possible. | |
139 | */ | |
140 | if (*eax == 1) | |
141 | maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ | |
142 | (1 << X86_FEATURE_ACPI) | /* disable ACPI */ | |
143 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ | |
144 | ||
145 | asm(XEN_EMULATE_PREFIX "cpuid" | |
146 | : "=a" (*eax), | |
147 | "=b" (*ebx), | |
148 | "=c" (*ecx), | |
149 | "=d" (*edx) | |
150 | : "0" (*eax), "2" (*ecx)); | |
151 | *edx &= maskedx; | |
152 | } | |
153 | ||
154 | static void xen_set_debugreg(int reg, unsigned long val) | |
155 | { | |
156 | HYPERVISOR_set_debugreg(reg, val); | |
157 | } | |
158 | ||
159 | static unsigned long xen_get_debugreg(int reg) | |
160 | { | |
161 | return HYPERVISOR_get_debugreg(reg); | |
162 | } | |
163 | ||
164 | static unsigned long xen_save_fl(void) | |
165 | { | |
166 | struct vcpu_info *vcpu; | |
167 | unsigned long flags; | |
168 | ||
5ead97c8 | 169 | vcpu = x86_read_percpu(xen_vcpu); |
f120f13e | 170 | |
5ead97c8 JF |
171 | /* flag has opposite sense of mask */ |
172 | flags = !vcpu->evtchn_upcall_mask; | |
5ead97c8 JF |
173 | |
174 | /* convert to IF type flag | |
175 | -0 -> 0x00000000 | |
176 | -1 -> 0xffffffff | |
177 | */ | |
178 | return (-flags) & X86_EFLAGS_IF; | |
179 | } | |
180 | ||
181 | static void xen_restore_fl(unsigned long flags) | |
182 | { | |
183 | struct vcpu_info *vcpu; | |
184 | ||
5ead97c8 JF |
185 | /* convert from IF type flag */ |
186 | flags = !(flags & X86_EFLAGS_IF); | |
f120f13e JF |
187 | |
188 | /* There's a one instruction preempt window here. We need to | |
189 | make sure we're don't switch CPUs between getting the vcpu | |
190 | pointer and updating the mask. */ | |
191 | preempt_disable(); | |
5ead97c8 JF |
192 | vcpu = x86_read_percpu(xen_vcpu); |
193 | vcpu->evtchn_upcall_mask = flags; | |
f120f13e | 194 | preempt_enable_no_resched(); |
5ead97c8 | 195 | |
f120f13e JF |
196 | /* Doesn't matter if we get preempted here, because any |
197 | pending event will get dealt with anyway. */ | |
5ead97c8 | 198 | |
f120f13e JF |
199 | if (flags == 0) { |
200 | preempt_check_resched(); | |
201 | barrier(); /* unmask then check (avoid races) */ | |
5ead97c8 JF |
202 | if (unlikely(vcpu->evtchn_upcall_pending)) |
203 | force_evtchn_callback(); | |
f120f13e | 204 | } |
5ead97c8 JF |
205 | } |
206 | ||
207 | static void xen_irq_disable(void) | |
208 | { | |
f120f13e JF |
209 | /* There's a one instruction preempt window here. We need to |
210 | make sure we're don't switch CPUs between getting the vcpu | |
211 | pointer and updating the mask. */ | |
5ead97c8 | 212 | preempt_disable(); |
f120f13e | 213 | x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; |
5ead97c8 JF |
214 | preempt_enable_no_resched(); |
215 | } | |
216 | ||
217 | static void xen_irq_enable(void) | |
218 | { | |
219 | struct vcpu_info *vcpu; | |
220 | ||
f120f13e JF |
221 | /* There's a one instruction preempt window here. We need to |
222 | make sure we're don't switch CPUs between getting the vcpu | |
223 | pointer and updating the mask. */ | |
5ead97c8 JF |
224 | preempt_disable(); |
225 | vcpu = x86_read_percpu(xen_vcpu); | |
226 | vcpu->evtchn_upcall_mask = 0; | |
f120f13e | 227 | preempt_enable_no_resched(); |
5ead97c8 | 228 | |
f120f13e JF |
229 | /* Doesn't matter if we get preempted here, because any |
230 | pending event will get dealt with anyway. */ | |
5ead97c8 | 231 | |
f120f13e | 232 | barrier(); /* unmask then check (avoid races) */ |
5ead97c8 JF |
233 | if (unlikely(vcpu->evtchn_upcall_pending)) |
234 | force_evtchn_callback(); | |
5ead97c8 JF |
235 | } |
236 | ||
237 | static void xen_safe_halt(void) | |
238 | { | |
239 | /* Blocking includes an implicit local_irq_enable(). */ | |
240 | if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) | |
241 | BUG(); | |
242 | } | |
243 | ||
244 | static void xen_halt(void) | |
245 | { | |
246 | if (irqs_disabled()) | |
247 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | |
248 | else | |
249 | xen_safe_halt(); | |
250 | } | |
251 | ||
252 | static void xen_set_lazy_mode(enum paravirt_lazy_mode mode) | |
253 | { | |
f120f13e JF |
254 | BUG_ON(preemptible()); |
255 | ||
5ead97c8 JF |
256 | switch (mode) { |
257 | case PARAVIRT_LAZY_NONE: | |
258 | BUG_ON(x86_read_percpu(xen_lazy_mode) == PARAVIRT_LAZY_NONE); | |
259 | break; | |
260 | ||
261 | case PARAVIRT_LAZY_MMU: | |
262 | case PARAVIRT_LAZY_CPU: | |
263 | BUG_ON(x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE); | |
264 | break; | |
265 | ||
266 | case PARAVIRT_LAZY_FLUSH: | |
267 | /* flush if necessary, but don't change state */ | |
268 | if (x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE) | |
269 | xen_mc_flush(); | |
270 | return; | |
271 | } | |
272 | ||
273 | xen_mc_flush(); | |
274 | x86_write_percpu(xen_lazy_mode, mode); | |
275 | } | |
276 | ||
277 | static unsigned long xen_store_tr(void) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static void xen_set_ldt(const void *addr, unsigned entries) | |
283 | { | |
284 | unsigned long linear_addr = (unsigned long)addr; | |
285 | struct mmuext_op *op; | |
286 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
287 | ||
288 | op = mcs.args; | |
289 | op->cmd = MMUEXT_SET_LDT; | |
290 | if (linear_addr) { | |
291 | /* ldt my be vmalloced, use arbitrary_virt_to_machine */ | |
292 | xmaddr_t maddr; | |
293 | maddr = arbitrary_virt_to_machine((unsigned long)addr); | |
294 | linear_addr = (unsigned long)maddr.maddr; | |
295 | } | |
296 | op->arg1.linear_addr = linear_addr; | |
297 | op->arg2.nr_ents = entries; | |
298 | ||
299 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
300 | ||
301 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
302 | } | |
303 | ||
304 | static void xen_load_gdt(const struct Xgt_desc_struct *dtr) | |
305 | { | |
306 | unsigned long *frames; | |
307 | unsigned long va = dtr->address; | |
308 | unsigned int size = dtr->size + 1; | |
309 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
310 | int f; | |
311 | struct multicall_space mcs; | |
312 | ||
313 | /* A GDT can be up to 64k in size, which corresponds to 8192 | |
314 | 8-byte entries, or 16 4k pages.. */ | |
315 | ||
316 | BUG_ON(size > 65536); | |
317 | BUG_ON(va & ~PAGE_MASK); | |
318 | ||
319 | mcs = xen_mc_entry(sizeof(*frames) * pages); | |
320 | frames = mcs.args; | |
321 | ||
322 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { | |
323 | frames[f] = virt_to_mfn(va); | |
324 | make_lowmem_page_readonly((void *)va); | |
325 | } | |
326 | ||
327 | MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); | |
328 | ||
329 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
330 | } | |
331 | ||
332 | static void load_TLS_descriptor(struct thread_struct *t, | |
333 | unsigned int cpu, unsigned int i) | |
334 | { | |
335 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
336 | xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); | |
337 | struct multicall_space mc = __xen_mc_entry(0); | |
338 | ||
339 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); | |
340 | } | |
341 | ||
342 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) | |
343 | { | |
344 | xen_mc_batch(); | |
345 | ||
346 | load_TLS_descriptor(t, cpu, 0); | |
347 | load_TLS_descriptor(t, cpu, 1); | |
348 | load_TLS_descriptor(t, cpu, 2); | |
349 | ||
350 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
8b84ad94 JF |
351 | |
352 | /* | |
353 | * XXX sleazy hack: If we're being called in a lazy-cpu zone, | |
354 | * it means we're in a context switch, and %gs has just been | |
355 | * saved. This means we can zero it out to prevent faults on | |
356 | * exit from the hypervisor if the next process has no %gs. | |
357 | * Either way, it has been saved, and the new value will get | |
358 | * loaded properly. This will go away as soon as Xen has been | |
359 | * modified to not save/restore %gs for normal hypercalls. | |
360 | */ | |
361 | if (xen_get_lazy_mode() == PARAVIRT_LAZY_CPU) | |
362 | loadsegment(gs, 0); | |
5ead97c8 JF |
363 | } |
364 | ||
365 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, | |
366 | u32 low, u32 high) | |
367 | { | |
368 | unsigned long lp = (unsigned long)&dt[entrynum]; | |
369 | xmaddr_t mach_lp = virt_to_machine(lp); | |
370 | u64 entry = (u64)high << 32 | low; | |
371 | ||
f120f13e JF |
372 | preempt_disable(); |
373 | ||
5ead97c8 JF |
374 | xen_mc_flush(); |
375 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) | |
376 | BUG(); | |
f120f13e JF |
377 | |
378 | preempt_enable(); | |
5ead97c8 JF |
379 | } |
380 | ||
381 | static int cvt_gate_to_trap(int vector, u32 low, u32 high, | |
382 | struct trap_info *info) | |
383 | { | |
384 | u8 type, dpl; | |
385 | ||
386 | type = (high >> 8) & 0x1f; | |
387 | dpl = (high >> 13) & 3; | |
388 | ||
389 | if (type != 0xf && type != 0xe) | |
390 | return 0; | |
391 | ||
392 | info->vector = vector; | |
393 | info->address = (high & 0xffff0000) | (low & 0x0000ffff); | |
394 | info->cs = low >> 16; | |
395 | info->flags = dpl; | |
396 | /* interrupt gates clear IF */ | |
397 | if (type == 0xe) | |
398 | info->flags |= 4; | |
399 | ||
400 | return 1; | |
401 | } | |
402 | ||
403 | /* Locations of each CPU's IDT */ | |
404 | static DEFINE_PER_CPU(struct Xgt_desc_struct, idt_desc); | |
405 | ||
406 | /* Set an IDT entry. If the entry is part of the current IDT, then | |
407 | also update Xen. */ | |
408 | static void xen_write_idt_entry(struct desc_struct *dt, int entrynum, | |
409 | u32 low, u32 high) | |
410 | { | |
5ead97c8 | 411 | unsigned long p = (unsigned long)&dt[entrynum]; |
f120f13e JF |
412 | unsigned long start, end; |
413 | ||
414 | preempt_disable(); | |
415 | ||
416 | start = __get_cpu_var(idt_desc).address; | |
417 | end = start + __get_cpu_var(idt_desc).size + 1; | |
5ead97c8 JF |
418 | |
419 | xen_mc_flush(); | |
420 | ||
421 | write_dt_entry(dt, entrynum, low, high); | |
422 | ||
423 | if (p >= start && (p + 8) <= end) { | |
424 | struct trap_info info[2]; | |
425 | ||
426 | info[1].address = 0; | |
427 | ||
428 | if (cvt_gate_to_trap(entrynum, low, high, &info[0])) | |
429 | if (HYPERVISOR_set_trap_table(info)) | |
430 | BUG(); | |
431 | } | |
f120f13e JF |
432 | |
433 | preempt_enable(); | |
5ead97c8 JF |
434 | } |
435 | ||
f87e4cac JF |
436 | static void xen_convert_trap_info(const struct Xgt_desc_struct *desc, |
437 | struct trap_info *traps) | |
5ead97c8 | 438 | { |
5ead97c8 JF |
439 | unsigned in, out, count; |
440 | ||
5ead97c8 JF |
441 | count = (desc->size+1) / 8; |
442 | BUG_ON(count > 256); | |
443 | ||
5ead97c8 JF |
444 | for (in = out = 0; in < count; in++) { |
445 | const u32 *entry = (u32 *)(desc->address + in * 8); | |
446 | ||
447 | if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) | |
448 | out++; | |
449 | } | |
450 | traps[out].address = 0; | |
f87e4cac JF |
451 | } |
452 | ||
453 | void xen_copy_trap_info(struct trap_info *traps) | |
454 | { | |
f120f13e | 455 | const struct Xgt_desc_struct *desc = &__get_cpu_var(idt_desc); |
f87e4cac JF |
456 | |
457 | xen_convert_trap_info(desc, traps); | |
f87e4cac JF |
458 | } |
459 | ||
460 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we | |
461 | hold a spinlock to protect the static traps[] array (static because | |
462 | it avoids allocation, and saves stack space). */ | |
463 | static void xen_load_idt(const struct Xgt_desc_struct *desc) | |
464 | { | |
465 | static DEFINE_SPINLOCK(lock); | |
466 | static struct trap_info traps[257]; | |
f87e4cac JF |
467 | |
468 | spin_lock(&lock); | |
469 | ||
f120f13e JF |
470 | __get_cpu_var(idt_desc) = *desc; |
471 | ||
f87e4cac | 472 | xen_convert_trap_info(desc, traps); |
5ead97c8 JF |
473 | |
474 | xen_mc_flush(); | |
475 | if (HYPERVISOR_set_trap_table(traps)) | |
476 | BUG(); | |
477 | ||
478 | spin_unlock(&lock); | |
479 | } | |
480 | ||
481 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since | |
482 | they're handled differently. */ | |
483 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, | |
484 | u32 low, u32 high) | |
485 | { | |
f120f13e JF |
486 | preempt_disable(); |
487 | ||
5ead97c8 JF |
488 | switch ((high >> 8) & 0xff) { |
489 | case DESCTYPE_LDT: | |
490 | case DESCTYPE_TSS: | |
491 | /* ignore */ | |
492 | break; | |
493 | ||
494 | default: { | |
495 | xmaddr_t maddr = virt_to_machine(&dt[entry]); | |
496 | u64 desc = (u64)high << 32 | low; | |
497 | ||
498 | xen_mc_flush(); | |
499 | if (HYPERVISOR_update_descriptor(maddr.maddr, desc)) | |
500 | BUG(); | |
501 | } | |
502 | ||
503 | } | |
f120f13e JF |
504 | |
505 | preempt_enable(); | |
5ead97c8 JF |
506 | } |
507 | ||
508 | static void xen_load_esp0(struct tss_struct *tss, | |
f120f13e | 509 | struct thread_struct *thread) |
5ead97c8 JF |
510 | { |
511 | struct multicall_space mcs = xen_mc_entry(0); | |
512 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->esp0); | |
513 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
514 | } | |
515 | ||
516 | static void xen_set_iopl_mask(unsigned mask) | |
517 | { | |
518 | struct physdev_set_iopl set_iopl; | |
519 | ||
520 | /* Force the change at ring 0. */ | |
521 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; | |
522 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
523 | } | |
524 | ||
525 | static void xen_io_delay(void) | |
526 | { | |
527 | } | |
528 | ||
529 | #ifdef CONFIG_X86_LOCAL_APIC | |
530 | static unsigned long xen_apic_read(unsigned long reg) | |
531 | { | |
532 | return 0; | |
533 | } | |
f87e4cac JF |
534 | |
535 | static void xen_apic_write(unsigned long reg, unsigned long val) | |
536 | { | |
537 | /* Warn to see if there's any stray references */ | |
538 | WARN_ON(1); | |
539 | } | |
5ead97c8 JF |
540 | #endif |
541 | ||
542 | static void xen_flush_tlb(void) | |
543 | { | |
d66bf8fc JF |
544 | struct mmuext_op *op; |
545 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 546 | |
d66bf8fc JF |
547 | op = mcs.args; |
548 | op->cmd = MMUEXT_TLB_FLUSH_LOCAL; | |
549 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
550 | ||
551 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
552 | } |
553 | ||
554 | static void xen_flush_tlb_single(unsigned long addr) | |
555 | { | |
d66bf8fc JF |
556 | struct mmuext_op *op; |
557 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 558 | |
d66bf8fc JF |
559 | op = mcs.args; |
560 | op->cmd = MMUEXT_INVLPG_LOCAL; | |
561 | op->arg1.linear_addr = addr & PAGE_MASK; | |
562 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
563 | ||
564 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
565 | } |
566 | ||
f87e4cac JF |
567 | static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, |
568 | unsigned long va) | |
569 | { | |
d66bf8fc JF |
570 | struct { |
571 | struct mmuext_op op; | |
572 | cpumask_t mask; | |
573 | } *args; | |
f87e4cac | 574 | cpumask_t cpumask = *cpus; |
d66bf8fc | 575 | struct multicall_space mcs; |
f87e4cac JF |
576 | |
577 | /* | |
578 | * A couple of (to be removed) sanity checks: | |
579 | * | |
580 | * - current CPU must not be in mask | |
581 | * - mask must exist :) | |
582 | */ | |
583 | BUG_ON(cpus_empty(cpumask)); | |
584 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); | |
585 | BUG_ON(!mm); | |
586 | ||
587 | /* If a CPU which we ran on has gone down, OK. */ | |
588 | cpus_and(cpumask, cpumask, cpu_online_map); | |
589 | if (cpus_empty(cpumask)) | |
590 | return; | |
591 | ||
d66bf8fc JF |
592 | mcs = xen_mc_entry(sizeof(*args)); |
593 | args = mcs.args; | |
594 | args->mask = cpumask; | |
595 | args->op.arg2.vcpumask = &args->mask; | |
596 | ||
f87e4cac | 597 | if (va == TLB_FLUSH_ALL) { |
d66bf8fc | 598 | args->op.cmd = MMUEXT_TLB_FLUSH_MULTI; |
f87e4cac | 599 | } else { |
d66bf8fc JF |
600 | args->op.cmd = MMUEXT_INVLPG_MULTI; |
601 | args->op.arg1.linear_addr = va; | |
f87e4cac JF |
602 | } |
603 | ||
d66bf8fc JF |
604 | MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); |
605 | ||
606 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
f87e4cac JF |
607 | } |
608 | ||
60223a32 JF |
609 | static void xen_write_cr2(unsigned long cr2) |
610 | { | |
611 | x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; | |
612 | } | |
613 | ||
5ead97c8 JF |
614 | static unsigned long xen_read_cr2(void) |
615 | { | |
616 | return x86_read_percpu(xen_vcpu)->arch.cr2; | |
617 | } | |
618 | ||
60223a32 JF |
619 | static unsigned long xen_read_cr2_direct(void) |
620 | { | |
621 | return x86_read_percpu(xen_vcpu_info.arch.cr2); | |
622 | } | |
623 | ||
5ead97c8 JF |
624 | static void xen_write_cr4(unsigned long cr4) |
625 | { | |
389a3c02 JF |
626 | /* Just ignore cr4 changes; Xen doesn't allow us to do |
627 | anything anyway. */ | |
5ead97c8 JF |
628 | } |
629 | ||
5ead97c8 JF |
630 | static unsigned long xen_read_cr3(void) |
631 | { | |
632 | return x86_read_percpu(xen_cr3); | |
633 | } | |
634 | ||
635 | static void xen_write_cr3(unsigned long cr3) | |
636 | { | |
f120f13e JF |
637 | BUG_ON(preemptible()); |
638 | ||
5ead97c8 JF |
639 | if (cr3 == x86_read_percpu(xen_cr3)) { |
640 | /* just a simple tlb flush */ | |
641 | xen_flush_tlb(); | |
642 | return; | |
643 | } | |
644 | ||
645 | x86_write_percpu(xen_cr3, cr3); | |
646 | ||
647 | ||
648 | { | |
649 | struct mmuext_op *op; | |
650 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
651 | unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); | |
652 | ||
653 | op = mcs.args; | |
654 | op->cmd = MMUEXT_NEW_BASEPTR; | |
655 | op->arg1.mfn = mfn; | |
656 | ||
657 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
658 | ||
659 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
660 | } | |
661 | } | |
662 | ||
f4f97b3e JF |
663 | /* Early in boot, while setting up the initial pagetable, assume |
664 | everything is pinned. */ | |
9a4029fd | 665 | static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn) |
5ead97c8 | 666 | { |
f4f97b3e | 667 | BUG_ON(mem_map); /* should only be used early */ |
5ead97c8 JF |
668 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
669 | } | |
670 | ||
f4f97b3e JF |
671 | /* This needs to make sure the new pte page is pinned iff its being |
672 | attached to a pinned pagetable. */ | |
673 | static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) | |
5ead97c8 | 674 | { |
f4f97b3e | 675 | struct page *page = pfn_to_page(pfn); |
5ead97c8 | 676 | |
f4f97b3e JF |
677 | if (PagePinned(virt_to_page(mm->pgd))) { |
678 | SetPagePinned(page); | |
679 | ||
680 | if (!PageHighMem(page)) | |
681 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); | |
682 | else | |
683 | /* make sure there are no stray mappings of | |
684 | this page */ | |
685 | kmap_flush_unused(); | |
686 | } | |
5ead97c8 JF |
687 | } |
688 | ||
f4f97b3e | 689 | /* This should never happen until we're OK to use struct page */ |
5ead97c8 JF |
690 | static void xen_release_pt(u32 pfn) |
691 | { | |
f4f97b3e JF |
692 | struct page *page = pfn_to_page(pfn); |
693 | ||
694 | if (PagePinned(page)) { | |
695 | if (!PageHighMem(page)) | |
696 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); | |
697 | } | |
5ead97c8 JF |
698 | } |
699 | ||
f4f97b3e JF |
700 | #ifdef CONFIG_HIGHPTE |
701 | static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) | |
5ead97c8 | 702 | { |
f4f97b3e JF |
703 | pgprot_t prot = PAGE_KERNEL; |
704 | ||
705 | if (PagePinned(page)) | |
706 | prot = PAGE_KERNEL_RO; | |
707 | ||
708 | if (0 && PageHighMem(page)) | |
709 | printk("mapping highpte %lx type %d prot %s\n", | |
710 | page_to_pfn(page), type, | |
711 | (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); | |
712 | ||
713 | return kmap_atomic_prot(page, type, prot); | |
5ead97c8 | 714 | } |
f4f97b3e | 715 | #endif |
5ead97c8 | 716 | |
9a4029fd JF |
717 | static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) |
718 | { | |
719 | /* If there's an existing pte, then don't allow _PAGE_RW to be set */ | |
720 | if (pte_val_ma(*ptep) & _PAGE_PRESENT) | |
721 | pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & | |
722 | pte_val_ma(pte)); | |
723 | ||
724 | return pte; | |
725 | } | |
726 | ||
727 | /* Init-time set_pte while constructing initial pagetables, which | |
728 | doesn't allow RO pagetable pages to be remapped RW */ | |
729 | static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) | |
730 | { | |
731 | pte = mask_rw_pte(ptep, pte); | |
732 | ||
733 | xen_set_pte(ptep, pte); | |
734 | } | |
735 | ||
5ead97c8 JF |
736 | static __init void xen_pagetable_setup_start(pgd_t *base) |
737 | { | |
738 | pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; | |
739 | ||
9a4029fd | 740 | /* special set_pte for pagetable initialization */ |
93b1eab3 | 741 | pv_mmu_ops.set_pte = xen_set_pte_init; |
9a4029fd | 742 | |
5ead97c8 JF |
743 | init_mm.pgd = base; |
744 | /* | |
745 | * copy top-level of Xen-supplied pagetable into place. For | |
746 | * !PAE we can use this as-is, but for PAE it is a stand-in | |
747 | * while we copy the pmd pages. | |
748 | */ | |
749 | memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t)); | |
750 | ||
751 | if (PTRS_PER_PMD > 1) { | |
752 | int i; | |
753 | /* | |
754 | * For PAE, need to allocate new pmds, rather than | |
755 | * share Xen's, since Xen doesn't like pmd's being | |
756 | * shared between address spaces. | |
757 | */ | |
758 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
759 | if (pgd_val_ma(xen_pgd[i]) & _PAGE_PRESENT) { | |
760 | pmd_t *pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
761 | ||
762 | memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), | |
763 | PAGE_SIZE); | |
764 | ||
f4f97b3e | 765 | make_lowmem_page_readonly(pmd); |
5ead97c8 JF |
766 | |
767 | set_pgd(&base[i], __pgd(1 + __pa(pmd))); | |
768 | } else | |
769 | pgd_clear(&base[i]); | |
770 | } | |
771 | } | |
772 | ||
773 | /* make sure zero_page is mapped RO so we can use it in pagetables */ | |
774 | make_lowmem_page_readonly(empty_zero_page); | |
775 | make_lowmem_page_readonly(base); | |
776 | /* | |
777 | * Switch to new pagetable. This is done before | |
778 | * pagetable_init has done anything so that the new pages | |
779 | * added to the table can be prepared properly for Xen. | |
780 | */ | |
781 | xen_write_cr3(__pa(base)); | |
782 | } | |
783 | ||
784 | static __init void xen_pagetable_setup_done(pgd_t *base) | |
785 | { | |
f4f97b3e JF |
786 | /* This will work as long as patching hasn't happened yet |
787 | (which it hasn't) */ | |
93b1eab3 JF |
788 | pv_mmu_ops.alloc_pt = xen_alloc_pt; |
789 | pv_mmu_ops.set_pte = xen_set_pte; | |
f4f97b3e | 790 | |
5ead97c8 JF |
791 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
792 | /* | |
793 | * Create a mapping for the shared info page. | |
794 | * Should be set_fixmap(), but shared_info is a machine | |
795 | * address with no corresponding pseudo-phys address. | |
796 | */ | |
5ead97c8 JF |
797 | set_pte_mfn(fix_to_virt(FIX_PARAVIRT_BOOTMAP), |
798 | PFN_DOWN(xen_start_info->shared_info), | |
799 | PAGE_KERNEL); | |
5ead97c8 JF |
800 | |
801 | HYPERVISOR_shared_info = | |
802 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); | |
803 | ||
804 | } else | |
805 | HYPERVISOR_shared_info = | |
806 | (struct shared_info *)__va(xen_start_info->shared_info); | |
807 | ||
f4f97b3e JF |
808 | /* Actually pin the pagetable down, but we can't set PG_pinned |
809 | yet because the page structures don't exist yet. */ | |
810 | { | |
811 | struct mmuext_op op; | |
812 | #ifdef CONFIG_X86_PAE | |
813 | op.cmd = MMUEXT_PIN_L3_TABLE; | |
814 | #else | |
815 | op.cmd = MMUEXT_PIN_L3_TABLE; | |
816 | #endif | |
817 | op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(base))); | |
818 | if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) | |
819 | BUG(); | |
820 | } | |
60223a32 | 821 | } |
5ead97c8 | 822 | |
60223a32 JF |
823 | /* This is called once we have the cpu_possible_map */ |
824 | void __init xen_setup_vcpu_info_placement(void) | |
825 | { | |
826 | int cpu; | |
827 | ||
828 | for_each_possible_cpu(cpu) | |
829 | xen_vcpu_setup(cpu); | |
830 | ||
831 | /* xen_vcpu_setup managed to place the vcpu_info within the | |
832 | percpu area for all cpus, so make use of it */ | |
833 | if (have_vcpu_info_placement) { | |
834 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); | |
835 | ||
93b1eab3 JF |
836 | pv_irq_ops.save_fl = xen_save_fl_direct; |
837 | pv_irq_ops.restore_fl = xen_restore_fl_direct; | |
838 | pv_irq_ops.irq_disable = xen_irq_disable_direct; | |
839 | pv_irq_ops.irq_enable = xen_irq_enable_direct; | |
840 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; | |
841 | pv_cpu_ops.iret = xen_iret_direct; | |
60223a32 | 842 | } |
5ead97c8 JF |
843 | } |
844 | ||
ab144f5e AK |
845 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
846 | unsigned long addr, unsigned len) | |
6487673b JF |
847 | { |
848 | char *start, *end, *reloc; | |
849 | unsigned ret; | |
850 | ||
851 | start = end = reloc = NULL; | |
852 | ||
93b1eab3 JF |
853 | #define SITE(op, x) \ |
854 | case PARAVIRT_PATCH(op.x): \ | |
6487673b JF |
855 | if (have_vcpu_info_placement) { \ |
856 | start = (char *)xen_##x##_direct; \ | |
857 | end = xen_##x##_direct_end; \ | |
858 | reloc = xen_##x##_direct_reloc; \ | |
859 | } \ | |
860 | goto patch_site | |
861 | ||
862 | switch (type) { | |
93b1eab3 JF |
863 | SITE(pv_irq_ops, irq_enable); |
864 | SITE(pv_irq_ops, irq_disable); | |
865 | SITE(pv_irq_ops, save_fl); | |
866 | SITE(pv_irq_ops, restore_fl); | |
6487673b JF |
867 | #undef SITE |
868 | ||
869 | patch_site: | |
870 | if (start == NULL || (end-start) > len) | |
871 | goto default_patch; | |
872 | ||
ab144f5e | 873 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
6487673b JF |
874 | |
875 | /* Note: because reloc is assigned from something that | |
876 | appears to be an array, gcc assumes it's non-null, | |
877 | but doesn't know its relationship with start and | |
878 | end. */ | |
879 | if (reloc > start && reloc < end) { | |
880 | int reloc_off = reloc - start; | |
ab144f5e AK |
881 | long *relocp = (long *)(insnbuf + reloc_off); |
882 | long delta = start - (char *)addr; | |
6487673b JF |
883 | |
884 | *relocp += delta; | |
885 | } | |
886 | break; | |
887 | ||
888 | default_patch: | |
889 | default: | |
ab144f5e AK |
890 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
891 | addr, len); | |
6487673b JF |
892 | break; |
893 | } | |
894 | ||
895 | return ret; | |
896 | } | |
897 | ||
93b1eab3 | 898 | static const struct pv_info xen_info __initdata = { |
5ead97c8 JF |
899 | .paravirt_enabled = 1, |
900 | .shared_kernel_pmd = 0, | |
901 | ||
902 | .name = "Xen", | |
93b1eab3 | 903 | }; |
5ead97c8 | 904 | |
93b1eab3 | 905 | static const struct pv_init_ops xen_init_ops __initdata = { |
6487673b | 906 | .patch = xen_patch, |
5ead97c8 | 907 | |
93b1eab3 | 908 | .banner = xen_banner, |
5ead97c8 JF |
909 | .memory_setup = xen_memory_setup, |
910 | .arch_setup = xen_arch_setup, | |
f4f97b3e | 911 | .post_allocator_init = xen_mark_init_mm_pinned, |
93b1eab3 | 912 | }; |
5ead97c8 | 913 | |
93b1eab3 | 914 | static const struct pv_time_ops xen_time_ops __initdata = { |
15c84731 | 915 | .time_init = xen_time_init, |
93b1eab3 | 916 | |
15c84731 JF |
917 | .set_wallclock = xen_set_wallclock, |
918 | .get_wallclock = xen_get_wallclock, | |
919 | .get_cpu_khz = xen_cpu_khz, | |
ab550288 | 920 | .sched_clock = xen_sched_clock, |
93b1eab3 | 921 | }; |
15c84731 | 922 | |
93b1eab3 | 923 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
5ead97c8 JF |
924 | .cpuid = xen_cpuid, |
925 | ||
926 | .set_debugreg = xen_set_debugreg, | |
927 | .get_debugreg = xen_get_debugreg, | |
928 | ||
929 | .clts = native_clts, | |
930 | ||
931 | .read_cr0 = native_read_cr0, | |
932 | .write_cr0 = native_write_cr0, | |
933 | ||
5ead97c8 JF |
934 | .read_cr4 = native_read_cr4, |
935 | .read_cr4_safe = native_read_cr4_safe, | |
936 | .write_cr4 = xen_write_cr4, | |
937 | ||
5ead97c8 JF |
938 | .wbinvd = native_wbinvd, |
939 | ||
940 | .read_msr = native_read_msr_safe, | |
941 | .write_msr = native_write_msr_safe, | |
942 | .read_tsc = native_read_tsc, | |
943 | .read_pmc = native_read_pmc, | |
944 | ||
945 | .iret = (void *)&hypercall_page[__HYPERVISOR_iret], | |
946 | .irq_enable_sysexit = NULL, /* never called */ | |
947 | ||
948 | .load_tr_desc = paravirt_nop, | |
949 | .set_ldt = xen_set_ldt, | |
950 | .load_gdt = xen_load_gdt, | |
951 | .load_idt = xen_load_idt, | |
952 | .load_tls = xen_load_tls, | |
953 | ||
954 | .store_gdt = native_store_gdt, | |
955 | .store_idt = native_store_idt, | |
956 | .store_tr = xen_store_tr, | |
957 | ||
958 | .write_ldt_entry = xen_write_ldt_entry, | |
959 | .write_gdt_entry = xen_write_gdt_entry, | |
960 | .write_idt_entry = xen_write_idt_entry, | |
961 | .load_esp0 = xen_load_esp0, | |
962 | ||
963 | .set_iopl_mask = xen_set_iopl_mask, | |
964 | .io_delay = xen_io_delay, | |
93b1eab3 JF |
965 | }; |
966 | ||
967 | static const struct pv_irq_ops xen_irq_ops __initdata = { | |
968 | .init_IRQ = xen_init_IRQ, | |
969 | .save_fl = xen_save_fl, | |
970 | .restore_fl = xen_restore_fl, | |
971 | .irq_disable = xen_irq_disable, | |
972 | .irq_enable = xen_irq_enable, | |
973 | .safe_halt = xen_safe_halt, | |
974 | .halt = xen_halt, | |
975 | }; | |
5ead97c8 | 976 | |
93b1eab3 | 977 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
5ead97c8 | 978 | #ifdef CONFIG_X86_LOCAL_APIC |
f87e4cac JF |
979 | .apic_write = xen_apic_write, |
980 | .apic_write_atomic = xen_apic_write, | |
5ead97c8 JF |
981 | .apic_read = xen_apic_read, |
982 | .setup_boot_clock = paravirt_nop, | |
983 | .setup_secondary_clock = paravirt_nop, | |
984 | .startup_ipi_hook = paravirt_nop, | |
985 | #endif | |
93b1eab3 JF |
986 | }; |
987 | ||
988 | static const struct pv_mmu_ops xen_mmu_ops __initdata = { | |
989 | .pagetable_setup_start = xen_pagetable_setup_start, | |
990 | .pagetable_setup_done = xen_pagetable_setup_done, | |
991 | ||
992 | .read_cr2 = xen_read_cr2, | |
993 | .write_cr2 = xen_write_cr2, | |
994 | ||
995 | .read_cr3 = xen_read_cr3, | |
996 | .write_cr3 = xen_write_cr3, | |
5ead97c8 JF |
997 | |
998 | .flush_tlb_user = xen_flush_tlb, | |
999 | .flush_tlb_kernel = xen_flush_tlb, | |
1000 | .flush_tlb_single = xen_flush_tlb_single, | |
f87e4cac | 1001 | .flush_tlb_others = xen_flush_tlb_others, |
5ead97c8 JF |
1002 | |
1003 | .pte_update = paravirt_nop, | |
1004 | .pte_update_defer = paravirt_nop, | |
1005 | ||
f4f97b3e | 1006 | .alloc_pt = xen_alloc_pt_init, |
5ead97c8 | 1007 | .release_pt = xen_release_pt, |
f4f97b3e JF |
1008 | .alloc_pd = paravirt_nop, |
1009 | .alloc_pd_clone = paravirt_nop, | |
1010 | .release_pd = paravirt_nop, | |
1011 | ||
1012 | #ifdef CONFIG_HIGHPTE | |
1013 | .kmap_atomic_pte = xen_kmap_atomic_pte, | |
1014 | #endif | |
5ead97c8 | 1015 | |
9a4029fd | 1016 | .set_pte = NULL, /* see xen_pagetable_setup_* */ |
3b827c1b JF |
1017 | .set_pte_at = xen_set_pte_at, |
1018 | .set_pmd = xen_set_pmd, | |
1019 | ||
1020 | .pte_val = xen_pte_val, | |
1021 | .pgd_val = xen_pgd_val, | |
1022 | ||
1023 | .make_pte = xen_make_pte, | |
1024 | .make_pgd = xen_make_pgd, | |
1025 | ||
1026 | #ifdef CONFIG_X86_PAE | |
1027 | .set_pte_atomic = xen_set_pte_atomic, | |
1028 | .set_pte_present = xen_set_pte_at, | |
1029 | .set_pud = xen_set_pud, | |
1030 | .pte_clear = xen_pte_clear, | |
1031 | .pmd_clear = xen_pmd_clear, | |
1032 | ||
1033 | .make_pmd = xen_make_pmd, | |
1034 | .pmd_val = xen_pmd_val, | |
1035 | #endif /* PAE */ | |
1036 | ||
1037 | .activate_mm = xen_activate_mm, | |
1038 | .dup_mmap = xen_dup_mmap, | |
1039 | .exit_mmap = xen_exit_mmap, | |
93b1eab3 | 1040 | }; |
3b827c1b | 1041 | |
93b1eab3 | 1042 | static const struct pv_misc_ops xen_misc_ops __initdata = { |
5ead97c8 JF |
1043 | .set_lazy_mode = xen_set_lazy_mode, |
1044 | }; | |
1045 | ||
f87e4cac JF |
1046 | #ifdef CONFIG_SMP |
1047 | static const struct smp_ops xen_smp_ops __initdata = { | |
1048 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, | |
1049 | .smp_prepare_cpus = xen_smp_prepare_cpus, | |
1050 | .cpu_up = xen_cpu_up, | |
1051 | .smp_cpus_done = xen_smp_cpus_done, | |
1052 | ||
1053 | .smp_send_stop = xen_smp_send_stop, | |
1054 | .smp_send_reschedule = xen_smp_send_reschedule, | |
1055 | .smp_call_function_mask = xen_smp_call_function_mask, | |
1056 | }; | |
1057 | #endif /* CONFIG_SMP */ | |
1058 | ||
fefa629a JF |
1059 | static void xen_reboot(int reason) |
1060 | { | |
1061 | #ifdef CONFIG_SMP | |
1062 | smp_send_stop(); | |
1063 | #endif | |
1064 | ||
1065 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) | |
1066 | BUG(); | |
1067 | } | |
1068 | ||
1069 | static void xen_restart(char *msg) | |
1070 | { | |
1071 | xen_reboot(SHUTDOWN_reboot); | |
1072 | } | |
1073 | ||
1074 | static void xen_emergency_restart(void) | |
1075 | { | |
1076 | xen_reboot(SHUTDOWN_reboot); | |
1077 | } | |
1078 | ||
1079 | static void xen_machine_halt(void) | |
1080 | { | |
1081 | xen_reboot(SHUTDOWN_poweroff); | |
1082 | } | |
1083 | ||
1084 | static void xen_crash_shutdown(struct pt_regs *regs) | |
1085 | { | |
1086 | xen_reboot(SHUTDOWN_crash); | |
1087 | } | |
1088 | ||
1089 | static const struct machine_ops __initdata xen_machine_ops = { | |
1090 | .restart = xen_restart, | |
1091 | .halt = xen_machine_halt, | |
1092 | .power_off = xen_machine_halt, | |
1093 | .shutdown = xen_machine_halt, | |
1094 | .crash_shutdown = xen_crash_shutdown, | |
1095 | .emergency_restart = xen_emergency_restart, | |
1096 | }; | |
1097 | ||
6487673b | 1098 | |
5ead97c8 JF |
1099 | /* First C function to be called on Xen boot */ |
1100 | asmlinkage void __init xen_start_kernel(void) | |
1101 | { | |
1102 | pgd_t *pgd; | |
1103 | ||
1104 | if (!xen_start_info) | |
1105 | return; | |
1106 | ||
1107 | BUG_ON(memcmp(xen_start_info->magic, "xen-3.0", 7) != 0); | |
1108 | ||
1109 | /* Install Xen paravirt ops */ | |
93b1eab3 JF |
1110 | pv_info = xen_info; |
1111 | pv_init_ops = xen_init_ops; | |
1112 | pv_time_ops = xen_time_ops; | |
1113 | pv_cpu_ops = xen_cpu_ops; | |
1114 | pv_irq_ops = xen_irq_ops; | |
1115 | pv_apic_ops = xen_apic_ops; | |
1116 | pv_mmu_ops = xen_mmu_ops; | |
1117 | pv_misc_ops = xen_misc_ops; | |
1118 | ||
fefa629a JF |
1119 | machine_ops = xen_machine_ops; |
1120 | ||
f87e4cac JF |
1121 | #ifdef CONFIG_SMP |
1122 | smp_ops = xen_smp_ops; | |
1123 | #endif | |
5ead97c8 JF |
1124 | |
1125 | xen_setup_features(); | |
1126 | ||
1127 | /* Get mfn list */ | |
1128 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
1129 | phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; | |
1130 | ||
1131 | pgd = (pgd_t *)xen_start_info->pt_base; | |
1132 | ||
1133 | init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; | |
1134 | ||
1135 | init_mm.pgd = pgd; /* use the Xen pagetables to start */ | |
1136 | ||
1137 | /* keep using Xen gdt for now; no urgent need to change it */ | |
1138 | ||
1139 | x86_write_percpu(xen_cr3, __pa(pgd)); | |
60223a32 JF |
1140 | |
1141 | #ifdef CONFIG_SMP | |
1142 | /* Don't do the full vcpu_info placement stuff until we have a | |
1143 | possible map. */ | |
1144 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; | |
1145 | #else | |
1146 | /* May as well do it now, since there's no good time to call | |
1147 | it later on UP. */ | |
1148 | xen_setup_vcpu_info_placement(); | |
1149 | #endif | |
5ead97c8 | 1150 | |
93b1eab3 | 1151 | pv_info.kernel_rpl = 1; |
5ead97c8 | 1152 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
93b1eab3 | 1153 | pv_info.kernel_rpl = 0; |
5ead97c8 JF |
1154 | |
1155 | /* set the limit of our address space */ | |
1156 | reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE); | |
1157 | ||
1158 | /* set up basic CPUID stuff */ | |
1159 | cpu_detect(&new_cpu_data); | |
1160 | new_cpu_data.hard_math = 1; | |
1161 | new_cpu_data.x86_capability[0] = cpuid_edx(1); | |
1162 | ||
1163 | /* Poke various useful things into boot_params */ | |
1164 | LOADER_TYPE = (9 << 4) | 0; | |
1165 | INITRD_START = xen_start_info->mod_start ? __pa(xen_start_info->mod_start) : 0; | |
1166 | INITRD_SIZE = xen_start_info->mod_len; | |
1167 | ||
1168 | /* Start the world */ | |
1169 | start_kernel(); | |
1170 | } |