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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> | |
5ead97c8 JF |
28 | |
29 | #include <xen/interface/xen.h> | |
30 | #include <xen/interface/physdev.h> | |
31 | #include <xen/interface/vcpu.h> | |
fefa629a | 32 | #include <xen/interface/sched.h> |
5ead97c8 JF |
33 | #include <xen/features.h> |
34 | #include <xen/page.h> | |
35 | ||
36 | #include <asm/paravirt.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/xen/hypercall.h> | |
39 | #include <asm/xen/hypervisor.h> | |
40 | #include <asm/fixmap.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/setup.h> | |
43 | #include <asm/desc.h> | |
44 | #include <asm/pgtable.h> | |
f87e4cac | 45 | #include <asm/tlbflush.h> |
fefa629a | 46 | #include <asm/reboot.h> |
5ead97c8 JF |
47 | |
48 | #include "xen-ops.h" | |
3b827c1b | 49 | #include "mmu.h" |
5ead97c8 JF |
50 | #include "multicalls.h" |
51 | ||
52 | EXPORT_SYMBOL_GPL(hypercall_page); | |
53 | ||
5ead97c8 JF |
54 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
55 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); | |
9f79991d JF |
56 | |
57 | /* | |
58 | * Note about cr3 (pagetable base) values: | |
59 | * | |
60 | * xen_cr3 contains the current logical cr3 value; it contains the | |
61 | * last set cr3. This may not be the current effective cr3, because | |
62 | * its update may be being lazily deferred. However, a vcpu looking | |
63 | * at its own cr3 can use this value knowing that it everything will | |
64 | * be self-consistent. | |
65 | * | |
66 | * xen_current_cr3 contains the actual vcpu cr3; it is set once the | |
67 | * hypercall to set the vcpu cr3 is complete (so it may be a little | |
68 | * out of date, but it will never be set early). If one vcpu is | |
69 | * looking at another vcpu's cr3 value, it should use this variable. | |
70 | */ | |
71 | DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */ | |
72 | DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */ | |
5ead97c8 JF |
73 | |
74 | struct start_info *xen_start_info; | |
75 | EXPORT_SYMBOL_GPL(xen_start_info); | |
76 | ||
60223a32 JF |
77 | static /* __initdata */ struct shared_info dummy_shared_info; |
78 | ||
79 | /* | |
80 | * Point at some empty memory to start with. We map the real shared_info | |
81 | * page as soon as fixmap is up and running. | |
82 | */ | |
83 | struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info; | |
84 | ||
85 | /* | |
86 | * Flag to determine whether vcpu info placement is available on all | |
87 | * VCPUs. We assume it is to start with, and then set it to zero on | |
88 | * the first failure. This is because it can succeed on some VCPUs | |
89 | * and not others, since it can involve hypervisor memory allocation, | |
90 | * or because the guest failed to guarantee all the appropriate | |
91 | * constraints on all VCPUs (ie buffer can't cross a page boundary). | |
92 | * | |
93 | * Note that any particular CPU may be using a placed vcpu structure, | |
94 | * but we can only optimise if the all are. | |
95 | * | |
96 | * 0: not available, 1: available | |
97 | */ | |
f9c4cfe9 | 98 | static int have_vcpu_info_placement = 0; |
60223a32 JF |
99 | |
100 | static void __init xen_vcpu_setup(int cpu) | |
5ead97c8 | 101 | { |
60223a32 JF |
102 | struct vcpu_register_vcpu_info info; |
103 | int err; | |
104 | struct vcpu_info *vcpup; | |
105 | ||
5ead97c8 | 106 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
60223a32 JF |
107 | |
108 | if (!have_vcpu_info_placement) | |
109 | return; /* already tested, not available */ | |
110 | ||
111 | vcpup = &per_cpu(xen_vcpu_info, cpu); | |
112 | ||
113 | info.mfn = virt_to_mfn(vcpup); | |
114 | info.offset = offset_in_page(vcpup); | |
115 | ||
e3d26976 | 116 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n", |
60223a32 JF |
117 | cpu, vcpup, info.mfn, info.offset); |
118 | ||
119 | /* Check to see if the hypervisor will put the vcpu_info | |
120 | structure where we want it, which allows direct access via | |
121 | a percpu-variable. */ | |
122 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); | |
123 | ||
124 | if (err) { | |
125 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); | |
126 | have_vcpu_info_placement = 0; | |
127 | } else { | |
128 | /* This cpu is using the registered vcpu info, even if | |
129 | later ones fail to. */ | |
130 | per_cpu(xen_vcpu, cpu) = vcpup; | |
6487673b | 131 | |
60223a32 JF |
132 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
133 | cpu, vcpup); | |
134 | } | |
5ead97c8 JF |
135 | } |
136 | ||
137 | static void __init xen_banner(void) | |
138 | { | |
139 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", | |
93b1eab3 | 140 | pv_info.name); |
5ead97c8 JF |
141 | printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); |
142 | } | |
143 | ||
65ea5b03 PA |
144 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
145 | unsigned int *cx, unsigned int *dx) | |
5ead97c8 JF |
146 | { |
147 | unsigned maskedx = ~0; | |
148 | ||
149 | /* | |
150 | * Mask out inconvenient features, to try and disable as many | |
151 | * unsupported kernel subsystems as possible. | |
152 | */ | |
65ea5b03 | 153 | if (*ax == 1) |
5ead97c8 JF |
154 | maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ |
155 | (1 << X86_FEATURE_ACPI) | /* disable ACPI */ | |
156 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ | |
157 | ||
158 | asm(XEN_EMULATE_PREFIX "cpuid" | |
65ea5b03 PA |
159 | : "=a" (*ax), |
160 | "=b" (*bx), | |
161 | "=c" (*cx), | |
162 | "=d" (*dx) | |
163 | : "0" (*ax), "2" (*cx)); | |
164 | *dx &= maskedx; | |
5ead97c8 JF |
165 | } |
166 | ||
167 | static void xen_set_debugreg(int reg, unsigned long val) | |
168 | { | |
169 | HYPERVISOR_set_debugreg(reg, val); | |
170 | } | |
171 | ||
172 | static unsigned long xen_get_debugreg(int reg) | |
173 | { | |
174 | return HYPERVISOR_get_debugreg(reg); | |
175 | } | |
176 | ||
177 | static unsigned long xen_save_fl(void) | |
178 | { | |
179 | struct vcpu_info *vcpu; | |
180 | unsigned long flags; | |
181 | ||
5ead97c8 | 182 | vcpu = x86_read_percpu(xen_vcpu); |
f120f13e | 183 | |
5ead97c8 JF |
184 | /* flag has opposite sense of mask */ |
185 | flags = !vcpu->evtchn_upcall_mask; | |
5ead97c8 JF |
186 | |
187 | /* convert to IF type flag | |
188 | -0 -> 0x00000000 | |
189 | -1 -> 0xffffffff | |
190 | */ | |
191 | return (-flags) & X86_EFLAGS_IF; | |
192 | } | |
193 | ||
194 | static void xen_restore_fl(unsigned long flags) | |
195 | { | |
196 | struct vcpu_info *vcpu; | |
197 | ||
5ead97c8 JF |
198 | /* convert from IF type flag */ |
199 | flags = !(flags & X86_EFLAGS_IF); | |
f120f13e JF |
200 | |
201 | /* There's a one instruction preempt window here. We need to | |
202 | make sure we're don't switch CPUs between getting the vcpu | |
203 | pointer and updating the mask. */ | |
204 | preempt_disable(); | |
5ead97c8 JF |
205 | vcpu = x86_read_percpu(xen_vcpu); |
206 | vcpu->evtchn_upcall_mask = flags; | |
f120f13e | 207 | preempt_enable_no_resched(); |
5ead97c8 | 208 | |
f120f13e JF |
209 | /* Doesn't matter if we get preempted here, because any |
210 | pending event will get dealt with anyway. */ | |
5ead97c8 | 211 | |
f120f13e JF |
212 | if (flags == 0) { |
213 | preempt_check_resched(); | |
214 | barrier(); /* unmask then check (avoid races) */ | |
5ead97c8 JF |
215 | if (unlikely(vcpu->evtchn_upcall_pending)) |
216 | force_evtchn_callback(); | |
f120f13e | 217 | } |
5ead97c8 JF |
218 | } |
219 | ||
220 | static void xen_irq_disable(void) | |
221 | { | |
f120f13e JF |
222 | /* There's a one instruction preempt window here. We need to |
223 | make sure we're don't switch CPUs between getting the vcpu | |
224 | pointer and updating the mask. */ | |
5ead97c8 | 225 | preempt_disable(); |
f120f13e | 226 | x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; |
5ead97c8 JF |
227 | preempt_enable_no_resched(); |
228 | } | |
229 | ||
230 | static void xen_irq_enable(void) | |
231 | { | |
232 | struct vcpu_info *vcpu; | |
233 | ||
f120f13e JF |
234 | /* There's a one instruction preempt window here. We need to |
235 | make sure we're don't switch CPUs between getting the vcpu | |
236 | pointer and updating the mask. */ | |
5ead97c8 JF |
237 | preempt_disable(); |
238 | vcpu = x86_read_percpu(xen_vcpu); | |
239 | vcpu->evtchn_upcall_mask = 0; | |
f120f13e | 240 | preempt_enable_no_resched(); |
5ead97c8 | 241 | |
f120f13e JF |
242 | /* Doesn't matter if we get preempted here, because any |
243 | pending event will get dealt with anyway. */ | |
5ead97c8 | 244 | |
f120f13e | 245 | barrier(); /* unmask then check (avoid races) */ |
5ead97c8 JF |
246 | if (unlikely(vcpu->evtchn_upcall_pending)) |
247 | force_evtchn_callback(); | |
5ead97c8 JF |
248 | } |
249 | ||
250 | static void xen_safe_halt(void) | |
251 | { | |
252 | /* Blocking includes an implicit local_irq_enable(). */ | |
253 | if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) | |
254 | BUG(); | |
255 | } | |
256 | ||
257 | static void xen_halt(void) | |
258 | { | |
259 | if (irqs_disabled()) | |
260 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | |
261 | else | |
262 | xen_safe_halt(); | |
263 | } | |
264 | ||
8965c1c0 | 265 | static void xen_leave_lazy(void) |
5ead97c8 | 266 | { |
8965c1c0 | 267 | paravirt_leave_lazy(paravirt_get_lazy_mode()); |
5ead97c8 | 268 | xen_mc_flush(); |
5ead97c8 JF |
269 | } |
270 | ||
271 | static unsigned long xen_store_tr(void) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static void xen_set_ldt(const void *addr, unsigned entries) | |
277 | { | |
278 | unsigned long linear_addr = (unsigned long)addr; | |
279 | struct mmuext_op *op; | |
280 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
281 | ||
282 | op = mcs.args; | |
283 | op->cmd = MMUEXT_SET_LDT; | |
284 | if (linear_addr) { | |
285 | /* ldt my be vmalloced, use arbitrary_virt_to_machine */ | |
286 | xmaddr_t maddr; | |
287 | maddr = arbitrary_virt_to_machine((unsigned long)addr); | |
288 | linear_addr = (unsigned long)maddr.maddr; | |
289 | } | |
290 | op->arg1.linear_addr = linear_addr; | |
291 | op->arg2.nr_ents = entries; | |
292 | ||
293 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
294 | ||
295 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
296 | } | |
297 | ||
298 | static void xen_load_gdt(const struct Xgt_desc_struct *dtr) | |
299 | { | |
300 | unsigned long *frames; | |
301 | unsigned long va = dtr->address; | |
302 | unsigned int size = dtr->size + 1; | |
303 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
304 | int f; | |
305 | struct multicall_space mcs; | |
306 | ||
307 | /* A GDT can be up to 64k in size, which corresponds to 8192 | |
308 | 8-byte entries, or 16 4k pages.. */ | |
309 | ||
310 | BUG_ON(size > 65536); | |
311 | BUG_ON(va & ~PAGE_MASK); | |
312 | ||
313 | mcs = xen_mc_entry(sizeof(*frames) * pages); | |
314 | frames = mcs.args; | |
315 | ||
316 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { | |
317 | frames[f] = virt_to_mfn(va); | |
318 | make_lowmem_page_readonly((void *)va); | |
319 | } | |
320 | ||
321 | MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); | |
322 | ||
323 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
324 | } | |
325 | ||
326 | static void load_TLS_descriptor(struct thread_struct *t, | |
327 | unsigned int cpu, unsigned int i) | |
328 | { | |
329 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
330 | xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); | |
331 | struct multicall_space mc = __xen_mc_entry(0); | |
332 | ||
333 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); | |
334 | } | |
335 | ||
336 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) | |
337 | { | |
338 | xen_mc_batch(); | |
339 | ||
340 | load_TLS_descriptor(t, cpu, 0); | |
341 | load_TLS_descriptor(t, cpu, 1); | |
342 | load_TLS_descriptor(t, cpu, 2); | |
343 | ||
344 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
8b84ad94 JF |
345 | |
346 | /* | |
347 | * XXX sleazy hack: If we're being called in a lazy-cpu zone, | |
348 | * it means we're in a context switch, and %gs has just been | |
349 | * saved. This means we can zero it out to prevent faults on | |
350 | * exit from the hypervisor if the next process has no %gs. | |
351 | * Either way, it has been saved, and the new value will get | |
352 | * loaded properly. This will go away as soon as Xen has been | |
353 | * modified to not save/restore %gs for normal hypercalls. | |
354 | */ | |
8965c1c0 | 355 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) |
8b84ad94 | 356 | loadsegment(gs, 0); |
5ead97c8 JF |
357 | } |
358 | ||
359 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, | |
360 | u32 low, u32 high) | |
361 | { | |
362 | unsigned long lp = (unsigned long)&dt[entrynum]; | |
363 | xmaddr_t mach_lp = virt_to_machine(lp); | |
364 | u64 entry = (u64)high << 32 | low; | |
365 | ||
f120f13e JF |
366 | preempt_disable(); |
367 | ||
5ead97c8 JF |
368 | xen_mc_flush(); |
369 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) | |
370 | BUG(); | |
f120f13e JF |
371 | |
372 | preempt_enable(); | |
5ead97c8 JF |
373 | } |
374 | ||
375 | static int cvt_gate_to_trap(int vector, u32 low, u32 high, | |
376 | struct trap_info *info) | |
377 | { | |
378 | u8 type, dpl; | |
379 | ||
380 | type = (high >> 8) & 0x1f; | |
381 | dpl = (high >> 13) & 3; | |
382 | ||
383 | if (type != 0xf && type != 0xe) | |
384 | return 0; | |
385 | ||
386 | info->vector = vector; | |
387 | info->address = (high & 0xffff0000) | (low & 0x0000ffff); | |
388 | info->cs = low >> 16; | |
389 | info->flags = dpl; | |
390 | /* interrupt gates clear IF */ | |
391 | if (type == 0xe) | |
392 | info->flags |= 4; | |
393 | ||
394 | return 1; | |
395 | } | |
396 | ||
397 | /* Locations of each CPU's IDT */ | |
398 | static DEFINE_PER_CPU(struct Xgt_desc_struct, idt_desc); | |
399 | ||
400 | /* Set an IDT entry. If the entry is part of the current IDT, then | |
401 | also update Xen. */ | |
402 | static void xen_write_idt_entry(struct desc_struct *dt, int entrynum, | |
403 | u32 low, u32 high) | |
404 | { | |
5ead97c8 | 405 | unsigned long p = (unsigned long)&dt[entrynum]; |
f120f13e JF |
406 | unsigned long start, end; |
407 | ||
408 | preempt_disable(); | |
409 | ||
410 | start = __get_cpu_var(idt_desc).address; | |
411 | end = start + __get_cpu_var(idt_desc).size + 1; | |
5ead97c8 JF |
412 | |
413 | xen_mc_flush(); | |
414 | ||
415 | write_dt_entry(dt, entrynum, low, high); | |
416 | ||
417 | if (p >= start && (p + 8) <= end) { | |
418 | struct trap_info info[2]; | |
419 | ||
420 | info[1].address = 0; | |
421 | ||
422 | if (cvt_gate_to_trap(entrynum, low, high, &info[0])) | |
423 | if (HYPERVISOR_set_trap_table(info)) | |
424 | BUG(); | |
425 | } | |
f120f13e JF |
426 | |
427 | preempt_enable(); | |
5ead97c8 JF |
428 | } |
429 | ||
f87e4cac JF |
430 | static void xen_convert_trap_info(const struct Xgt_desc_struct *desc, |
431 | struct trap_info *traps) | |
5ead97c8 | 432 | { |
5ead97c8 JF |
433 | unsigned in, out, count; |
434 | ||
5ead97c8 JF |
435 | count = (desc->size+1) / 8; |
436 | BUG_ON(count > 256); | |
437 | ||
5ead97c8 JF |
438 | for (in = out = 0; in < count; in++) { |
439 | const u32 *entry = (u32 *)(desc->address + in * 8); | |
440 | ||
441 | if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) | |
442 | out++; | |
443 | } | |
444 | traps[out].address = 0; | |
f87e4cac JF |
445 | } |
446 | ||
447 | void xen_copy_trap_info(struct trap_info *traps) | |
448 | { | |
f120f13e | 449 | const struct Xgt_desc_struct *desc = &__get_cpu_var(idt_desc); |
f87e4cac JF |
450 | |
451 | xen_convert_trap_info(desc, traps); | |
f87e4cac JF |
452 | } |
453 | ||
454 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we | |
455 | hold a spinlock to protect the static traps[] array (static because | |
456 | it avoids allocation, and saves stack space). */ | |
457 | static void xen_load_idt(const struct Xgt_desc_struct *desc) | |
458 | { | |
459 | static DEFINE_SPINLOCK(lock); | |
460 | static struct trap_info traps[257]; | |
f87e4cac JF |
461 | |
462 | spin_lock(&lock); | |
463 | ||
f120f13e JF |
464 | __get_cpu_var(idt_desc) = *desc; |
465 | ||
f87e4cac | 466 | xen_convert_trap_info(desc, traps); |
5ead97c8 JF |
467 | |
468 | xen_mc_flush(); | |
469 | if (HYPERVISOR_set_trap_table(traps)) | |
470 | BUG(); | |
471 | ||
472 | spin_unlock(&lock); | |
473 | } | |
474 | ||
475 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since | |
476 | they're handled differently. */ | |
477 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, | |
478 | u32 low, u32 high) | |
479 | { | |
f120f13e JF |
480 | preempt_disable(); |
481 | ||
5ead97c8 JF |
482 | switch ((high >> 8) & 0xff) { |
483 | case DESCTYPE_LDT: | |
484 | case DESCTYPE_TSS: | |
485 | /* ignore */ | |
486 | break; | |
487 | ||
488 | default: { | |
489 | xmaddr_t maddr = virt_to_machine(&dt[entry]); | |
490 | u64 desc = (u64)high << 32 | low; | |
491 | ||
492 | xen_mc_flush(); | |
493 | if (HYPERVISOR_update_descriptor(maddr.maddr, desc)) | |
494 | BUG(); | |
495 | } | |
496 | ||
497 | } | |
f120f13e JF |
498 | |
499 | preempt_enable(); | |
5ead97c8 JF |
500 | } |
501 | ||
502 | static void xen_load_esp0(struct tss_struct *tss, | |
f120f13e | 503 | struct thread_struct *thread) |
5ead97c8 JF |
504 | { |
505 | struct multicall_space mcs = xen_mc_entry(0); | |
506 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->esp0); | |
507 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
508 | } | |
509 | ||
510 | static void xen_set_iopl_mask(unsigned mask) | |
511 | { | |
512 | struct physdev_set_iopl set_iopl; | |
513 | ||
514 | /* Force the change at ring 0. */ | |
515 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; | |
516 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
517 | } | |
518 | ||
519 | static void xen_io_delay(void) | |
520 | { | |
521 | } | |
522 | ||
523 | #ifdef CONFIG_X86_LOCAL_APIC | |
42e0a9aa | 524 | static u32 xen_apic_read(unsigned long reg) |
5ead97c8 JF |
525 | { |
526 | return 0; | |
527 | } | |
f87e4cac | 528 | |
42e0a9aa | 529 | static void xen_apic_write(unsigned long reg, u32 val) |
f87e4cac JF |
530 | { |
531 | /* Warn to see if there's any stray references */ | |
532 | WARN_ON(1); | |
533 | } | |
5ead97c8 JF |
534 | #endif |
535 | ||
536 | static void xen_flush_tlb(void) | |
537 | { | |
d66bf8fc JF |
538 | struct mmuext_op *op; |
539 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 540 | |
d66bf8fc JF |
541 | op = mcs.args; |
542 | op->cmd = MMUEXT_TLB_FLUSH_LOCAL; | |
543 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
544 | ||
545 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
546 | } |
547 | ||
548 | static void xen_flush_tlb_single(unsigned long addr) | |
549 | { | |
d66bf8fc JF |
550 | struct mmuext_op *op; |
551 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 552 | |
d66bf8fc JF |
553 | op = mcs.args; |
554 | op->cmd = MMUEXT_INVLPG_LOCAL; | |
555 | op->arg1.linear_addr = addr & PAGE_MASK; | |
556 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
557 | ||
558 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
559 | } |
560 | ||
f87e4cac JF |
561 | static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, |
562 | unsigned long va) | |
563 | { | |
d66bf8fc JF |
564 | struct { |
565 | struct mmuext_op op; | |
566 | cpumask_t mask; | |
567 | } *args; | |
f87e4cac | 568 | cpumask_t cpumask = *cpus; |
d66bf8fc | 569 | struct multicall_space mcs; |
f87e4cac JF |
570 | |
571 | /* | |
572 | * A couple of (to be removed) sanity checks: | |
573 | * | |
574 | * - current CPU must not be in mask | |
575 | * - mask must exist :) | |
576 | */ | |
577 | BUG_ON(cpus_empty(cpumask)); | |
578 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); | |
579 | BUG_ON(!mm); | |
580 | ||
581 | /* If a CPU which we ran on has gone down, OK. */ | |
582 | cpus_and(cpumask, cpumask, cpu_online_map); | |
583 | if (cpus_empty(cpumask)) | |
584 | return; | |
585 | ||
d66bf8fc JF |
586 | mcs = xen_mc_entry(sizeof(*args)); |
587 | args = mcs.args; | |
588 | args->mask = cpumask; | |
589 | args->op.arg2.vcpumask = &args->mask; | |
590 | ||
f87e4cac | 591 | if (va == TLB_FLUSH_ALL) { |
d66bf8fc | 592 | args->op.cmd = MMUEXT_TLB_FLUSH_MULTI; |
f87e4cac | 593 | } else { |
d66bf8fc JF |
594 | args->op.cmd = MMUEXT_INVLPG_MULTI; |
595 | args->op.arg1.linear_addr = va; | |
f87e4cac JF |
596 | } |
597 | ||
d66bf8fc JF |
598 | MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); |
599 | ||
600 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
f87e4cac JF |
601 | } |
602 | ||
60223a32 JF |
603 | static void xen_write_cr2(unsigned long cr2) |
604 | { | |
605 | x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; | |
606 | } | |
607 | ||
5ead97c8 JF |
608 | static unsigned long xen_read_cr2(void) |
609 | { | |
610 | return x86_read_percpu(xen_vcpu)->arch.cr2; | |
611 | } | |
612 | ||
60223a32 JF |
613 | static unsigned long xen_read_cr2_direct(void) |
614 | { | |
615 | return x86_read_percpu(xen_vcpu_info.arch.cr2); | |
616 | } | |
617 | ||
5ead97c8 JF |
618 | static void xen_write_cr4(unsigned long cr4) |
619 | { | |
389a3c02 JF |
620 | /* Just ignore cr4 changes; Xen doesn't allow us to do |
621 | anything anyway. */ | |
5ead97c8 JF |
622 | } |
623 | ||
5ead97c8 JF |
624 | static unsigned long xen_read_cr3(void) |
625 | { | |
626 | return x86_read_percpu(xen_cr3); | |
627 | } | |
628 | ||
9f79991d JF |
629 | static void set_current_cr3(void *v) |
630 | { | |
631 | x86_write_percpu(xen_current_cr3, (unsigned long)v); | |
632 | } | |
633 | ||
5ead97c8 JF |
634 | static void xen_write_cr3(unsigned long cr3) |
635 | { | |
9f79991d JF |
636 | struct mmuext_op *op; |
637 | struct multicall_space mcs; | |
638 | unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); | |
639 | ||
f120f13e JF |
640 | BUG_ON(preemptible()); |
641 | ||
9f79991d | 642 | mcs = xen_mc_entry(sizeof(*op)); /* disables interrupts */ |
5ead97c8 | 643 | |
9f79991d JF |
644 | /* Update while interrupts are disabled, so its atomic with |
645 | respect to ipis */ | |
5ead97c8 JF |
646 | x86_write_percpu(xen_cr3, cr3); |
647 | ||
9f79991d JF |
648 | op = mcs.args; |
649 | op->cmd = MMUEXT_NEW_BASEPTR; | |
650 | op->arg1.mfn = mfn; | |
5ead97c8 | 651 | |
9f79991d | 652 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
5ead97c8 | 653 | |
9f79991d JF |
654 | /* Update xen_update_cr3 once the batch has actually |
655 | been submitted. */ | |
656 | xen_mc_callback(set_current_cr3, (void *)cr3); | |
5ead97c8 | 657 | |
9f79991d | 658 | xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */ |
5ead97c8 JF |
659 | } |
660 | ||
f4f97b3e JF |
661 | /* Early in boot, while setting up the initial pagetable, assume |
662 | everything is pinned. */ | |
9a4029fd | 663 | static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn) |
5ead97c8 | 664 | { |
f4f97b3e | 665 | BUG_ON(mem_map); /* should only be used early */ |
5ead97c8 JF |
666 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
667 | } | |
668 | ||
74260714 JF |
669 | static void pin_pagetable_pfn(unsigned level, unsigned long pfn) |
670 | { | |
671 | struct mmuext_op op; | |
672 | op.cmd = level; | |
673 | op.arg1.mfn = pfn_to_mfn(pfn); | |
674 | if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) | |
675 | BUG(); | |
676 | } | |
677 | ||
f4f97b3e JF |
678 | /* This needs to make sure the new pte page is pinned iff its being |
679 | attached to a pinned pagetable. */ | |
680 | static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) | |
5ead97c8 | 681 | { |
f4f97b3e | 682 | struct page *page = pfn_to_page(pfn); |
5ead97c8 | 683 | |
f4f97b3e JF |
684 | if (PagePinned(virt_to_page(mm->pgd))) { |
685 | SetPagePinned(page); | |
686 | ||
74260714 | 687 | if (!PageHighMem(page)) { |
f4f97b3e | 688 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
74260714 JF |
689 | pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); |
690 | } else | |
f4f97b3e JF |
691 | /* make sure there are no stray mappings of |
692 | this page */ | |
693 | kmap_flush_unused(); | |
694 | } | |
5ead97c8 JF |
695 | } |
696 | ||
f4f97b3e | 697 | /* This should never happen until we're OK to use struct page */ |
5ead97c8 JF |
698 | static void xen_release_pt(u32 pfn) |
699 | { | |
f4f97b3e JF |
700 | struct page *page = pfn_to_page(pfn); |
701 | ||
702 | if (PagePinned(page)) { | |
74260714 JF |
703 | if (!PageHighMem(page)) { |
704 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); | |
f4f97b3e | 705 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); |
74260714 | 706 | } |
f4f97b3e | 707 | } |
5ead97c8 JF |
708 | } |
709 | ||
f4f97b3e JF |
710 | #ifdef CONFIG_HIGHPTE |
711 | static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) | |
5ead97c8 | 712 | { |
f4f97b3e JF |
713 | pgprot_t prot = PAGE_KERNEL; |
714 | ||
715 | if (PagePinned(page)) | |
716 | prot = PAGE_KERNEL_RO; | |
717 | ||
718 | if (0 && PageHighMem(page)) | |
719 | printk("mapping highpte %lx type %d prot %s\n", | |
720 | page_to_pfn(page), type, | |
721 | (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); | |
722 | ||
723 | return kmap_atomic_prot(page, type, prot); | |
5ead97c8 | 724 | } |
f4f97b3e | 725 | #endif |
5ead97c8 | 726 | |
9a4029fd JF |
727 | static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) |
728 | { | |
729 | /* If there's an existing pte, then don't allow _PAGE_RW to be set */ | |
730 | if (pte_val_ma(*ptep) & _PAGE_PRESENT) | |
731 | pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & | |
732 | pte_val_ma(pte)); | |
733 | ||
734 | return pte; | |
735 | } | |
736 | ||
737 | /* Init-time set_pte while constructing initial pagetables, which | |
738 | doesn't allow RO pagetable pages to be remapped RW */ | |
739 | static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) | |
740 | { | |
741 | pte = mask_rw_pte(ptep, pte); | |
742 | ||
743 | xen_set_pte(ptep, pte); | |
744 | } | |
745 | ||
5ead97c8 JF |
746 | static __init void xen_pagetable_setup_start(pgd_t *base) |
747 | { | |
748 | pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; | |
749 | ||
9a4029fd | 750 | /* special set_pte for pagetable initialization */ |
93b1eab3 | 751 | pv_mmu_ops.set_pte = xen_set_pte_init; |
9a4029fd | 752 | |
5ead97c8 JF |
753 | init_mm.pgd = base; |
754 | /* | |
755 | * copy top-level of Xen-supplied pagetable into place. For | |
756 | * !PAE we can use this as-is, but for PAE it is a stand-in | |
757 | * while we copy the pmd pages. | |
758 | */ | |
759 | memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t)); | |
760 | ||
761 | if (PTRS_PER_PMD > 1) { | |
762 | int i; | |
763 | /* | |
764 | * For PAE, need to allocate new pmds, rather than | |
765 | * share Xen's, since Xen doesn't like pmd's being | |
766 | * shared between address spaces. | |
767 | */ | |
768 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
769 | if (pgd_val_ma(xen_pgd[i]) & _PAGE_PRESENT) { | |
770 | pmd_t *pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
771 | ||
772 | memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), | |
773 | PAGE_SIZE); | |
774 | ||
f4f97b3e | 775 | make_lowmem_page_readonly(pmd); |
5ead97c8 JF |
776 | |
777 | set_pgd(&base[i], __pgd(1 + __pa(pmd))); | |
778 | } else | |
779 | pgd_clear(&base[i]); | |
780 | } | |
781 | } | |
782 | ||
783 | /* make sure zero_page is mapped RO so we can use it in pagetables */ | |
784 | make_lowmem_page_readonly(empty_zero_page); | |
785 | make_lowmem_page_readonly(base); | |
786 | /* | |
787 | * Switch to new pagetable. This is done before | |
788 | * pagetable_init has done anything so that the new pages | |
789 | * added to the table can be prepared properly for Xen. | |
790 | */ | |
791 | xen_write_cr3(__pa(base)); | |
792 | } | |
793 | ||
794 | static __init void xen_pagetable_setup_done(pgd_t *base) | |
795 | { | |
f4f97b3e JF |
796 | /* This will work as long as patching hasn't happened yet |
797 | (which it hasn't) */ | |
93b1eab3 JF |
798 | pv_mmu_ops.alloc_pt = xen_alloc_pt; |
799 | pv_mmu_ops.set_pte = xen_set_pte; | |
f4f97b3e | 800 | |
5ead97c8 JF |
801 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { |
802 | /* | |
803 | * Create a mapping for the shared info page. | |
804 | * Should be set_fixmap(), but shared_info is a machine | |
805 | * address with no corresponding pseudo-phys address. | |
806 | */ | |
5ead97c8 JF |
807 | set_pte_mfn(fix_to_virt(FIX_PARAVIRT_BOOTMAP), |
808 | PFN_DOWN(xen_start_info->shared_info), | |
809 | PAGE_KERNEL); | |
5ead97c8 JF |
810 | |
811 | HYPERVISOR_shared_info = | |
812 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); | |
813 | ||
814 | } else | |
815 | HYPERVISOR_shared_info = | |
816 | (struct shared_info *)__va(xen_start_info->shared_info); | |
817 | ||
f4f97b3e JF |
818 | /* Actually pin the pagetable down, but we can't set PG_pinned |
819 | yet because the page structures don't exist yet. */ | |
820 | { | |
74260714 JF |
821 | unsigned level; |
822 | ||
f4f97b3e | 823 | #ifdef CONFIG_X86_PAE |
74260714 | 824 | level = MMUEXT_PIN_L3_TABLE; |
f4f97b3e | 825 | #else |
74260714 | 826 | level = MMUEXT_PIN_L2_TABLE; |
f4f97b3e | 827 | #endif |
74260714 JF |
828 | |
829 | pin_pagetable_pfn(level, PFN_DOWN(__pa(base))); | |
f4f97b3e | 830 | } |
60223a32 | 831 | } |
5ead97c8 | 832 | |
60223a32 JF |
833 | /* This is called once we have the cpu_possible_map */ |
834 | void __init xen_setup_vcpu_info_placement(void) | |
835 | { | |
836 | int cpu; | |
837 | ||
838 | for_each_possible_cpu(cpu) | |
839 | xen_vcpu_setup(cpu); | |
840 | ||
841 | /* xen_vcpu_setup managed to place the vcpu_info within the | |
842 | percpu area for all cpus, so make use of it */ | |
843 | if (have_vcpu_info_placement) { | |
844 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); | |
845 | ||
93b1eab3 JF |
846 | pv_irq_ops.save_fl = xen_save_fl_direct; |
847 | pv_irq_ops.restore_fl = xen_restore_fl_direct; | |
848 | pv_irq_ops.irq_disable = xen_irq_disable_direct; | |
849 | pv_irq_ops.irq_enable = xen_irq_enable_direct; | |
850 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; | |
851 | pv_cpu_ops.iret = xen_iret_direct; | |
60223a32 | 852 | } |
5ead97c8 JF |
853 | } |
854 | ||
ab144f5e AK |
855 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
856 | unsigned long addr, unsigned len) | |
6487673b JF |
857 | { |
858 | char *start, *end, *reloc; | |
859 | unsigned ret; | |
860 | ||
861 | start = end = reloc = NULL; | |
862 | ||
93b1eab3 JF |
863 | #define SITE(op, x) \ |
864 | case PARAVIRT_PATCH(op.x): \ | |
6487673b JF |
865 | if (have_vcpu_info_placement) { \ |
866 | start = (char *)xen_##x##_direct; \ | |
867 | end = xen_##x##_direct_end; \ | |
868 | reloc = xen_##x##_direct_reloc; \ | |
869 | } \ | |
870 | goto patch_site | |
871 | ||
872 | switch (type) { | |
93b1eab3 JF |
873 | SITE(pv_irq_ops, irq_enable); |
874 | SITE(pv_irq_ops, irq_disable); | |
875 | SITE(pv_irq_ops, save_fl); | |
876 | SITE(pv_irq_ops, restore_fl); | |
6487673b JF |
877 | #undef SITE |
878 | ||
879 | patch_site: | |
880 | if (start == NULL || (end-start) > len) | |
881 | goto default_patch; | |
882 | ||
ab144f5e | 883 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
6487673b JF |
884 | |
885 | /* Note: because reloc is assigned from something that | |
886 | appears to be an array, gcc assumes it's non-null, | |
887 | but doesn't know its relationship with start and | |
888 | end. */ | |
889 | if (reloc > start && reloc < end) { | |
890 | int reloc_off = reloc - start; | |
ab144f5e AK |
891 | long *relocp = (long *)(insnbuf + reloc_off); |
892 | long delta = start - (char *)addr; | |
6487673b JF |
893 | |
894 | *relocp += delta; | |
895 | } | |
896 | break; | |
897 | ||
898 | default_patch: | |
899 | default: | |
ab144f5e AK |
900 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
901 | addr, len); | |
6487673b JF |
902 | break; |
903 | } | |
904 | ||
905 | return ret; | |
906 | } | |
907 | ||
93b1eab3 | 908 | static const struct pv_info xen_info __initdata = { |
5ead97c8 JF |
909 | .paravirt_enabled = 1, |
910 | .shared_kernel_pmd = 0, | |
911 | ||
912 | .name = "Xen", | |
93b1eab3 | 913 | }; |
5ead97c8 | 914 | |
93b1eab3 | 915 | static const struct pv_init_ops xen_init_ops __initdata = { |
6487673b | 916 | .patch = xen_patch, |
5ead97c8 | 917 | |
93b1eab3 | 918 | .banner = xen_banner, |
5ead97c8 JF |
919 | .memory_setup = xen_memory_setup, |
920 | .arch_setup = xen_arch_setup, | |
f4f97b3e | 921 | .post_allocator_init = xen_mark_init_mm_pinned, |
93b1eab3 | 922 | }; |
5ead97c8 | 923 | |
93b1eab3 | 924 | static const struct pv_time_ops xen_time_ops __initdata = { |
15c84731 | 925 | .time_init = xen_time_init, |
93b1eab3 | 926 | |
15c84731 JF |
927 | .set_wallclock = xen_set_wallclock, |
928 | .get_wallclock = xen_get_wallclock, | |
929 | .get_cpu_khz = xen_cpu_khz, | |
ab550288 | 930 | .sched_clock = xen_sched_clock, |
93b1eab3 | 931 | }; |
15c84731 | 932 | |
93b1eab3 | 933 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
5ead97c8 JF |
934 | .cpuid = xen_cpuid, |
935 | ||
936 | .set_debugreg = xen_set_debugreg, | |
937 | .get_debugreg = xen_get_debugreg, | |
938 | ||
939 | .clts = native_clts, | |
940 | ||
941 | .read_cr0 = native_read_cr0, | |
942 | .write_cr0 = native_write_cr0, | |
943 | ||
5ead97c8 JF |
944 | .read_cr4 = native_read_cr4, |
945 | .read_cr4_safe = native_read_cr4_safe, | |
946 | .write_cr4 = xen_write_cr4, | |
947 | ||
5ead97c8 JF |
948 | .wbinvd = native_wbinvd, |
949 | ||
950 | .read_msr = native_read_msr_safe, | |
951 | .write_msr = native_write_msr_safe, | |
952 | .read_tsc = native_read_tsc, | |
953 | .read_pmc = native_read_pmc, | |
954 | ||
955 | .iret = (void *)&hypercall_page[__HYPERVISOR_iret], | |
6abcd98f | 956 | .irq_enable_syscall_ret = NULL, /* never called */ |
5ead97c8 JF |
957 | |
958 | .load_tr_desc = paravirt_nop, | |
959 | .set_ldt = xen_set_ldt, | |
960 | .load_gdt = xen_load_gdt, | |
961 | .load_idt = xen_load_idt, | |
962 | .load_tls = xen_load_tls, | |
963 | ||
964 | .store_gdt = native_store_gdt, | |
965 | .store_idt = native_store_idt, | |
966 | .store_tr = xen_store_tr, | |
967 | ||
968 | .write_ldt_entry = xen_write_ldt_entry, | |
969 | .write_gdt_entry = xen_write_gdt_entry, | |
970 | .write_idt_entry = xen_write_idt_entry, | |
971 | .load_esp0 = xen_load_esp0, | |
972 | ||
973 | .set_iopl_mask = xen_set_iopl_mask, | |
974 | .io_delay = xen_io_delay, | |
975 | ||
8965c1c0 JF |
976 | .lazy_mode = { |
977 | .enter = paravirt_enter_lazy_cpu, | |
978 | .leave = xen_leave_lazy, | |
979 | }, | |
93b1eab3 JF |
980 | }; |
981 | ||
982 | static const struct pv_irq_ops xen_irq_ops __initdata = { | |
983 | .init_IRQ = xen_init_IRQ, | |
984 | .save_fl = xen_save_fl, | |
985 | .restore_fl = xen_restore_fl, | |
986 | .irq_disable = xen_irq_disable, | |
987 | .irq_enable = xen_irq_enable, | |
988 | .safe_halt = xen_safe_halt, | |
989 | .halt = xen_halt, | |
990 | }; | |
5ead97c8 | 991 | |
93b1eab3 | 992 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
5ead97c8 | 993 | #ifdef CONFIG_X86_LOCAL_APIC |
f87e4cac JF |
994 | .apic_write = xen_apic_write, |
995 | .apic_write_atomic = xen_apic_write, | |
5ead97c8 JF |
996 | .apic_read = xen_apic_read, |
997 | .setup_boot_clock = paravirt_nop, | |
998 | .setup_secondary_clock = paravirt_nop, | |
999 | .startup_ipi_hook = paravirt_nop, | |
1000 | #endif | |
93b1eab3 JF |
1001 | }; |
1002 | ||
1003 | static const struct pv_mmu_ops xen_mmu_ops __initdata = { | |
1004 | .pagetable_setup_start = xen_pagetable_setup_start, | |
1005 | .pagetable_setup_done = xen_pagetable_setup_done, | |
1006 | ||
1007 | .read_cr2 = xen_read_cr2, | |
1008 | .write_cr2 = xen_write_cr2, | |
1009 | ||
1010 | .read_cr3 = xen_read_cr3, | |
1011 | .write_cr3 = xen_write_cr3, | |
5ead97c8 JF |
1012 | |
1013 | .flush_tlb_user = xen_flush_tlb, | |
1014 | .flush_tlb_kernel = xen_flush_tlb, | |
1015 | .flush_tlb_single = xen_flush_tlb_single, | |
f87e4cac | 1016 | .flush_tlb_others = xen_flush_tlb_others, |
5ead97c8 JF |
1017 | |
1018 | .pte_update = paravirt_nop, | |
1019 | .pte_update_defer = paravirt_nop, | |
1020 | ||
f4f97b3e | 1021 | .alloc_pt = xen_alloc_pt_init, |
5ead97c8 | 1022 | .release_pt = xen_release_pt, |
f4f97b3e JF |
1023 | .alloc_pd = paravirt_nop, |
1024 | .alloc_pd_clone = paravirt_nop, | |
1025 | .release_pd = paravirt_nop, | |
1026 | ||
1027 | #ifdef CONFIG_HIGHPTE | |
1028 | .kmap_atomic_pte = xen_kmap_atomic_pte, | |
1029 | #endif | |
5ead97c8 | 1030 | |
9a4029fd | 1031 | .set_pte = NULL, /* see xen_pagetable_setup_* */ |
3b827c1b JF |
1032 | .set_pte_at = xen_set_pte_at, |
1033 | .set_pmd = xen_set_pmd, | |
1034 | ||
1035 | .pte_val = xen_pte_val, | |
1036 | .pgd_val = xen_pgd_val, | |
1037 | ||
1038 | .make_pte = xen_make_pte, | |
1039 | .make_pgd = xen_make_pgd, | |
1040 | ||
1041 | #ifdef CONFIG_X86_PAE | |
1042 | .set_pte_atomic = xen_set_pte_atomic, | |
1043 | .set_pte_present = xen_set_pte_at, | |
1044 | .set_pud = xen_set_pud, | |
1045 | .pte_clear = xen_pte_clear, | |
1046 | .pmd_clear = xen_pmd_clear, | |
1047 | ||
1048 | .make_pmd = xen_make_pmd, | |
1049 | .pmd_val = xen_pmd_val, | |
1050 | #endif /* PAE */ | |
1051 | ||
1052 | .activate_mm = xen_activate_mm, | |
1053 | .dup_mmap = xen_dup_mmap, | |
1054 | .exit_mmap = xen_exit_mmap, | |
1055 | ||
8965c1c0 JF |
1056 | .lazy_mode = { |
1057 | .enter = paravirt_enter_lazy_mmu, | |
1058 | .leave = xen_leave_lazy, | |
1059 | }, | |
5ead97c8 JF |
1060 | }; |
1061 | ||
f87e4cac JF |
1062 | #ifdef CONFIG_SMP |
1063 | static const struct smp_ops xen_smp_ops __initdata = { | |
1064 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, | |
1065 | .smp_prepare_cpus = xen_smp_prepare_cpus, | |
1066 | .cpu_up = xen_cpu_up, | |
1067 | .smp_cpus_done = xen_smp_cpus_done, | |
1068 | ||
1069 | .smp_send_stop = xen_smp_send_stop, | |
1070 | .smp_send_reschedule = xen_smp_send_reschedule, | |
1071 | .smp_call_function_mask = xen_smp_call_function_mask, | |
1072 | }; | |
1073 | #endif /* CONFIG_SMP */ | |
1074 | ||
fefa629a JF |
1075 | static void xen_reboot(int reason) |
1076 | { | |
1077 | #ifdef CONFIG_SMP | |
1078 | smp_send_stop(); | |
1079 | #endif | |
1080 | ||
1081 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) | |
1082 | BUG(); | |
1083 | } | |
1084 | ||
1085 | static void xen_restart(char *msg) | |
1086 | { | |
1087 | xen_reboot(SHUTDOWN_reboot); | |
1088 | } | |
1089 | ||
1090 | static void xen_emergency_restart(void) | |
1091 | { | |
1092 | xen_reboot(SHUTDOWN_reboot); | |
1093 | } | |
1094 | ||
1095 | static void xen_machine_halt(void) | |
1096 | { | |
1097 | xen_reboot(SHUTDOWN_poweroff); | |
1098 | } | |
1099 | ||
1100 | static void xen_crash_shutdown(struct pt_regs *regs) | |
1101 | { | |
1102 | xen_reboot(SHUTDOWN_crash); | |
1103 | } | |
1104 | ||
1105 | static const struct machine_ops __initdata xen_machine_ops = { | |
1106 | .restart = xen_restart, | |
1107 | .halt = xen_machine_halt, | |
1108 | .power_off = xen_machine_halt, | |
1109 | .shutdown = xen_machine_halt, | |
1110 | .crash_shutdown = xen_crash_shutdown, | |
1111 | .emergency_restart = xen_emergency_restart, | |
1112 | }; | |
1113 | ||
6487673b | 1114 | |
fb1d8404 JF |
1115 | static void __init xen_reserve_top(void) |
1116 | { | |
1117 | unsigned long top = HYPERVISOR_VIRT_START; | |
1118 | struct xen_platform_parameters pp; | |
1119 | ||
1120 | if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) | |
1121 | top = pp.virt_start; | |
1122 | ||
1123 | reserve_top_address(-top + 2 * PAGE_SIZE); | |
1124 | } | |
1125 | ||
5ead97c8 JF |
1126 | /* First C function to be called on Xen boot */ |
1127 | asmlinkage void __init xen_start_kernel(void) | |
1128 | { | |
1129 | pgd_t *pgd; | |
1130 | ||
1131 | if (!xen_start_info) | |
1132 | return; | |
1133 | ||
7999f4b4 | 1134 | BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); |
5ead97c8 JF |
1135 | |
1136 | /* Install Xen paravirt ops */ | |
93b1eab3 JF |
1137 | pv_info = xen_info; |
1138 | pv_init_ops = xen_init_ops; | |
1139 | pv_time_ops = xen_time_ops; | |
1140 | pv_cpu_ops = xen_cpu_ops; | |
1141 | pv_irq_ops = xen_irq_ops; | |
1142 | pv_apic_ops = xen_apic_ops; | |
1143 | pv_mmu_ops = xen_mmu_ops; | |
93b1eab3 | 1144 | |
fefa629a JF |
1145 | machine_ops = xen_machine_ops; |
1146 | ||
f87e4cac JF |
1147 | #ifdef CONFIG_SMP |
1148 | smp_ops = xen_smp_ops; | |
1149 | #endif | |
5ead97c8 JF |
1150 | |
1151 | xen_setup_features(); | |
1152 | ||
1153 | /* Get mfn list */ | |
1154 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
1155 | phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; | |
1156 | ||
1157 | pgd = (pgd_t *)xen_start_info->pt_base; | |
1158 | ||
1159 | init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; | |
1160 | ||
1161 | init_mm.pgd = pgd; /* use the Xen pagetables to start */ | |
1162 | ||
1163 | /* keep using Xen gdt for now; no urgent need to change it */ | |
1164 | ||
1165 | x86_write_percpu(xen_cr3, __pa(pgd)); | |
9f79991d | 1166 | x86_write_percpu(xen_current_cr3, __pa(pgd)); |
60223a32 JF |
1167 | |
1168 | #ifdef CONFIG_SMP | |
1169 | /* Don't do the full vcpu_info placement stuff until we have a | |
1170 | possible map. */ | |
1171 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; | |
1172 | #else | |
1173 | /* May as well do it now, since there's no good time to call | |
1174 | it later on UP. */ | |
1175 | xen_setup_vcpu_info_placement(); | |
1176 | #endif | |
5ead97c8 | 1177 | |
93b1eab3 | 1178 | pv_info.kernel_rpl = 1; |
5ead97c8 | 1179 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
93b1eab3 | 1180 | pv_info.kernel_rpl = 0; |
5ead97c8 JF |
1181 | |
1182 | /* set the limit of our address space */ | |
fb1d8404 | 1183 | xen_reserve_top(); |
5ead97c8 JF |
1184 | |
1185 | /* set up basic CPUID stuff */ | |
1186 | cpu_detect(&new_cpu_data); | |
1187 | new_cpu_data.hard_math = 1; | |
1188 | new_cpu_data.x86_capability[0] = cpuid_edx(1); | |
1189 | ||
1190 | /* Poke various useful things into boot_params */ | |
30c82645 PA |
1191 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
1192 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start | |
1193 | ? __pa(xen_start_info->mod_start) : 0; | |
1194 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; | |
5ead97c8 JF |
1195 | |
1196 | /* Start the world */ | |
1197 | start_kernel(); | |
1198 | } |