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 | */ | |
04c44a08 | 98 | static int have_vcpu_info_placement = 1; |
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 | ||
2e8fe719 | 106 | BUG_ON(HYPERVISOR_shared_info == &dummy_shared_info); |
5ead97c8 | 107 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
60223a32 JF |
108 | |
109 | if (!have_vcpu_info_placement) | |
110 | return; /* already tested, not available */ | |
111 | ||
112 | vcpup = &per_cpu(xen_vcpu_info, cpu); | |
113 | ||
114 | info.mfn = virt_to_mfn(vcpup); | |
115 | info.offset = offset_in_page(vcpup); | |
116 | ||
e3d26976 | 117 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n", |
60223a32 JF |
118 | cpu, vcpup, info.mfn, info.offset); |
119 | ||
120 | /* Check to see if the hypervisor will put the vcpu_info | |
121 | structure where we want it, which allows direct access via | |
122 | a percpu-variable. */ | |
123 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); | |
124 | ||
125 | if (err) { | |
126 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); | |
127 | have_vcpu_info_placement = 0; | |
128 | } else { | |
129 | /* This cpu is using the registered vcpu info, even if | |
130 | later ones fail to. */ | |
131 | per_cpu(xen_vcpu, cpu) = vcpup; | |
6487673b | 132 | |
60223a32 JF |
133 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
134 | cpu, vcpup); | |
135 | } | |
5ead97c8 JF |
136 | } |
137 | ||
138 | static void __init xen_banner(void) | |
139 | { | |
140 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", | |
93b1eab3 | 141 | pv_info.name); |
5ead97c8 JF |
142 | printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic); |
143 | } | |
144 | ||
65ea5b03 PA |
145 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
146 | unsigned int *cx, unsigned int *dx) | |
5ead97c8 JF |
147 | { |
148 | unsigned maskedx = ~0; | |
149 | ||
150 | /* | |
151 | * Mask out inconvenient features, to try and disable as many | |
152 | * unsupported kernel subsystems as possible. | |
153 | */ | |
65ea5b03 | 154 | if (*ax == 1) |
5ead97c8 JF |
155 | maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ |
156 | (1 << X86_FEATURE_ACPI) | /* disable ACPI */ | |
d40e7059 | 157 | (1 << X86_FEATURE_SEP) | /* disable SEP */ |
5ead97c8 JF |
158 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ |
159 | ||
160 | asm(XEN_EMULATE_PREFIX "cpuid" | |
65ea5b03 PA |
161 | : "=a" (*ax), |
162 | "=b" (*bx), | |
163 | "=c" (*cx), | |
164 | "=d" (*dx) | |
165 | : "0" (*ax), "2" (*cx)); | |
166 | *dx &= maskedx; | |
5ead97c8 JF |
167 | } |
168 | ||
169 | static void xen_set_debugreg(int reg, unsigned long val) | |
170 | { | |
171 | HYPERVISOR_set_debugreg(reg, val); | |
172 | } | |
173 | ||
174 | static unsigned long xen_get_debugreg(int reg) | |
175 | { | |
176 | return HYPERVISOR_get_debugreg(reg); | |
177 | } | |
178 | ||
179 | static unsigned long xen_save_fl(void) | |
180 | { | |
181 | struct vcpu_info *vcpu; | |
182 | unsigned long flags; | |
183 | ||
5ead97c8 | 184 | vcpu = x86_read_percpu(xen_vcpu); |
f120f13e | 185 | |
5ead97c8 JF |
186 | /* flag has opposite sense of mask */ |
187 | flags = !vcpu->evtchn_upcall_mask; | |
5ead97c8 JF |
188 | |
189 | /* convert to IF type flag | |
190 | -0 -> 0x00000000 | |
191 | -1 -> 0xffffffff | |
192 | */ | |
193 | return (-flags) & X86_EFLAGS_IF; | |
194 | } | |
195 | ||
196 | static void xen_restore_fl(unsigned long flags) | |
197 | { | |
198 | struct vcpu_info *vcpu; | |
199 | ||
5ead97c8 JF |
200 | /* convert from IF type flag */ |
201 | flags = !(flags & X86_EFLAGS_IF); | |
f120f13e JF |
202 | |
203 | /* There's a one instruction preempt window here. We need to | |
204 | make sure we're don't switch CPUs between getting the vcpu | |
205 | pointer and updating the mask. */ | |
206 | preempt_disable(); | |
5ead97c8 JF |
207 | vcpu = x86_read_percpu(xen_vcpu); |
208 | vcpu->evtchn_upcall_mask = flags; | |
f120f13e | 209 | preempt_enable_no_resched(); |
5ead97c8 | 210 | |
f120f13e JF |
211 | /* Doesn't matter if we get preempted here, because any |
212 | pending event will get dealt with anyway. */ | |
5ead97c8 | 213 | |
f120f13e JF |
214 | if (flags == 0) { |
215 | preempt_check_resched(); | |
216 | barrier(); /* unmask then check (avoid races) */ | |
5ead97c8 JF |
217 | if (unlikely(vcpu->evtchn_upcall_pending)) |
218 | force_evtchn_callback(); | |
f120f13e | 219 | } |
5ead97c8 JF |
220 | } |
221 | ||
222 | static void xen_irq_disable(void) | |
223 | { | |
f120f13e JF |
224 | /* There's a one instruction preempt window here. We need to |
225 | make sure we're don't switch CPUs between getting the vcpu | |
226 | pointer and updating the mask. */ | |
5ead97c8 | 227 | preempt_disable(); |
f120f13e | 228 | x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1; |
5ead97c8 JF |
229 | preempt_enable_no_resched(); |
230 | } | |
231 | ||
232 | static void xen_irq_enable(void) | |
233 | { | |
234 | struct vcpu_info *vcpu; | |
235 | ||
f120f13e JF |
236 | /* There's a one instruction preempt window here. We need to |
237 | make sure we're don't switch CPUs between getting the vcpu | |
238 | pointer and updating the mask. */ | |
5ead97c8 JF |
239 | preempt_disable(); |
240 | vcpu = x86_read_percpu(xen_vcpu); | |
241 | vcpu->evtchn_upcall_mask = 0; | |
f120f13e | 242 | preempt_enable_no_resched(); |
5ead97c8 | 243 | |
f120f13e JF |
244 | /* Doesn't matter if we get preempted here, because any |
245 | pending event will get dealt with anyway. */ | |
5ead97c8 | 246 | |
f120f13e | 247 | barrier(); /* unmask then check (avoid races) */ |
5ead97c8 JF |
248 | if (unlikely(vcpu->evtchn_upcall_pending)) |
249 | force_evtchn_callback(); | |
5ead97c8 JF |
250 | } |
251 | ||
252 | static void xen_safe_halt(void) | |
253 | { | |
254 | /* Blocking includes an implicit local_irq_enable(). */ | |
255 | if (HYPERVISOR_sched_op(SCHEDOP_block, 0) != 0) | |
256 | BUG(); | |
257 | } | |
258 | ||
259 | static void xen_halt(void) | |
260 | { | |
261 | if (irqs_disabled()) | |
262 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | |
263 | else | |
264 | xen_safe_halt(); | |
265 | } | |
266 | ||
8965c1c0 | 267 | static void xen_leave_lazy(void) |
5ead97c8 | 268 | { |
8965c1c0 | 269 | paravirt_leave_lazy(paravirt_get_lazy_mode()); |
5ead97c8 | 270 | xen_mc_flush(); |
5ead97c8 JF |
271 | } |
272 | ||
273 | static unsigned long xen_store_tr(void) | |
274 | { | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static void xen_set_ldt(const void *addr, unsigned entries) | |
279 | { | |
5ead97c8 JF |
280 | struct mmuext_op *op; |
281 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
282 | ||
283 | op = mcs.args; | |
284 | op->cmd = MMUEXT_SET_LDT; | |
4dbf7af6 | 285 | op->arg1.linear_addr = (unsigned long)addr; |
5ead97c8 JF |
286 | op->arg2.nr_ents = entries; |
287 | ||
288 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
289 | ||
290 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
291 | } | |
292 | ||
6b68f01b | 293 | static void xen_load_gdt(const struct desc_ptr *dtr) |
5ead97c8 JF |
294 | { |
295 | unsigned long *frames; | |
296 | unsigned long va = dtr->address; | |
297 | unsigned int size = dtr->size + 1; | |
298 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
299 | int f; | |
300 | struct multicall_space mcs; | |
301 | ||
302 | /* A GDT can be up to 64k in size, which corresponds to 8192 | |
303 | 8-byte entries, or 16 4k pages.. */ | |
304 | ||
305 | BUG_ON(size > 65536); | |
306 | BUG_ON(va & ~PAGE_MASK); | |
307 | ||
308 | mcs = xen_mc_entry(sizeof(*frames) * pages); | |
309 | frames = mcs.args; | |
310 | ||
311 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { | |
312 | frames[f] = virt_to_mfn(va); | |
313 | make_lowmem_page_readonly((void *)va); | |
314 | } | |
315 | ||
316 | MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); | |
317 | ||
318 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
319 | } | |
320 | ||
321 | static void load_TLS_descriptor(struct thread_struct *t, | |
322 | unsigned int cpu, unsigned int i) | |
323 | { | |
324 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
325 | xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); | |
326 | struct multicall_space mc = __xen_mc_entry(0); | |
327 | ||
328 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); | |
329 | } | |
330 | ||
331 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) | |
332 | { | |
333 | xen_mc_batch(); | |
334 | ||
335 | load_TLS_descriptor(t, cpu, 0); | |
336 | load_TLS_descriptor(t, cpu, 1); | |
337 | load_TLS_descriptor(t, cpu, 2); | |
338 | ||
339 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
8b84ad94 JF |
340 | |
341 | /* | |
342 | * XXX sleazy hack: If we're being called in a lazy-cpu zone, | |
343 | * it means we're in a context switch, and %gs has just been | |
344 | * saved. This means we can zero it out to prevent faults on | |
345 | * exit from the hypervisor if the next process has no %gs. | |
346 | * Either way, it has been saved, and the new value will get | |
347 | * loaded properly. This will go away as soon as Xen has been | |
348 | * modified to not save/restore %gs for normal hypercalls. | |
349 | */ | |
8965c1c0 | 350 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) |
8b84ad94 | 351 | loadsegment(gs, 0); |
5ead97c8 JF |
352 | } |
353 | ||
354 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, | |
75b8bb3e | 355 | const void *ptr) |
5ead97c8 JF |
356 | { |
357 | unsigned long lp = (unsigned long)&dt[entrynum]; | |
358 | xmaddr_t mach_lp = virt_to_machine(lp); | |
75b8bb3e | 359 | u64 entry = *(u64 *)ptr; |
5ead97c8 | 360 | |
f120f13e JF |
361 | preempt_disable(); |
362 | ||
5ead97c8 JF |
363 | xen_mc_flush(); |
364 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) | |
365 | BUG(); | |
f120f13e JF |
366 | |
367 | preempt_enable(); | |
5ead97c8 JF |
368 | } |
369 | ||
370 | static int cvt_gate_to_trap(int vector, u32 low, u32 high, | |
371 | struct trap_info *info) | |
372 | { | |
373 | u8 type, dpl; | |
374 | ||
375 | type = (high >> 8) & 0x1f; | |
376 | dpl = (high >> 13) & 3; | |
377 | ||
378 | if (type != 0xf && type != 0xe) | |
379 | return 0; | |
380 | ||
381 | info->vector = vector; | |
382 | info->address = (high & 0xffff0000) | (low & 0x0000ffff); | |
383 | info->cs = low >> 16; | |
384 | info->flags = dpl; | |
385 | /* interrupt gates clear IF */ | |
386 | if (type == 0xe) | |
387 | info->flags |= 4; | |
388 | ||
389 | return 1; | |
390 | } | |
391 | ||
392 | /* Locations of each CPU's IDT */ | |
6b68f01b | 393 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
5ead97c8 JF |
394 | |
395 | /* Set an IDT entry. If the entry is part of the current IDT, then | |
396 | also update Xen. */ | |
8d947344 | 397 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
5ead97c8 | 398 | { |
5ead97c8 | 399 | unsigned long p = (unsigned long)&dt[entrynum]; |
f120f13e JF |
400 | unsigned long start, end; |
401 | ||
402 | preempt_disable(); | |
403 | ||
404 | start = __get_cpu_var(idt_desc).address; | |
405 | end = start + __get_cpu_var(idt_desc).size + 1; | |
5ead97c8 JF |
406 | |
407 | xen_mc_flush(); | |
408 | ||
8d947344 | 409 | native_write_idt_entry(dt, entrynum, g); |
5ead97c8 JF |
410 | |
411 | if (p >= start && (p + 8) <= end) { | |
412 | struct trap_info info[2]; | |
8d947344 | 413 | u32 *desc = (u32 *)g; |
5ead97c8 JF |
414 | |
415 | info[1].address = 0; | |
416 | ||
8d947344 | 417 | if (cvt_gate_to_trap(entrynum, desc[0], desc[1], &info[0])) |
5ead97c8 JF |
418 | if (HYPERVISOR_set_trap_table(info)) |
419 | BUG(); | |
420 | } | |
f120f13e JF |
421 | |
422 | preempt_enable(); | |
5ead97c8 JF |
423 | } |
424 | ||
6b68f01b | 425 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
f87e4cac | 426 | struct trap_info *traps) |
5ead97c8 | 427 | { |
5ead97c8 JF |
428 | unsigned in, out, count; |
429 | ||
5ead97c8 JF |
430 | count = (desc->size+1) / 8; |
431 | BUG_ON(count > 256); | |
432 | ||
5ead97c8 JF |
433 | for (in = out = 0; in < count; in++) { |
434 | const u32 *entry = (u32 *)(desc->address + in * 8); | |
435 | ||
436 | if (cvt_gate_to_trap(in, entry[0], entry[1], &traps[out])) | |
437 | out++; | |
438 | } | |
439 | traps[out].address = 0; | |
f87e4cac JF |
440 | } |
441 | ||
442 | void xen_copy_trap_info(struct trap_info *traps) | |
443 | { | |
6b68f01b | 444 | const struct desc_ptr *desc = &__get_cpu_var(idt_desc); |
f87e4cac JF |
445 | |
446 | xen_convert_trap_info(desc, traps); | |
f87e4cac JF |
447 | } |
448 | ||
449 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we | |
450 | hold a spinlock to protect the static traps[] array (static because | |
451 | it avoids allocation, and saves stack space). */ | |
6b68f01b | 452 | static void xen_load_idt(const struct desc_ptr *desc) |
f87e4cac JF |
453 | { |
454 | static DEFINE_SPINLOCK(lock); | |
455 | static struct trap_info traps[257]; | |
f87e4cac JF |
456 | |
457 | spin_lock(&lock); | |
458 | ||
f120f13e JF |
459 | __get_cpu_var(idt_desc) = *desc; |
460 | ||
f87e4cac | 461 | xen_convert_trap_info(desc, traps); |
5ead97c8 JF |
462 | |
463 | xen_mc_flush(); | |
464 | if (HYPERVISOR_set_trap_table(traps)) | |
465 | BUG(); | |
466 | ||
467 | spin_unlock(&lock); | |
468 | } | |
469 | ||
470 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since | |
471 | they're handled differently. */ | |
472 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, | |
014b15be | 473 | const void *desc, int type) |
5ead97c8 | 474 | { |
f120f13e JF |
475 | preempt_disable(); |
476 | ||
014b15be GOC |
477 | switch (type) { |
478 | case DESC_LDT: | |
479 | case DESC_TSS: | |
5ead97c8 JF |
480 | /* ignore */ |
481 | break; | |
482 | ||
483 | default: { | |
484 | xmaddr_t maddr = virt_to_machine(&dt[entry]); | |
5ead97c8 JF |
485 | |
486 | xen_mc_flush(); | |
014b15be | 487 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
5ead97c8 JF |
488 | BUG(); |
489 | } | |
490 | ||
491 | } | |
f120f13e JF |
492 | |
493 | preempt_enable(); | |
5ead97c8 JF |
494 | } |
495 | ||
faca6227 | 496 | static void xen_load_sp0(struct tss_struct *tss, |
f120f13e | 497 | struct thread_struct *thread) |
5ead97c8 JF |
498 | { |
499 | struct multicall_space mcs = xen_mc_entry(0); | |
faca6227 | 500 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
5ead97c8 JF |
501 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
502 | } | |
503 | ||
504 | static void xen_set_iopl_mask(unsigned mask) | |
505 | { | |
506 | struct physdev_set_iopl set_iopl; | |
507 | ||
508 | /* Force the change at ring 0. */ | |
509 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; | |
510 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
511 | } | |
512 | ||
513 | static void xen_io_delay(void) | |
514 | { | |
515 | } | |
516 | ||
517 | #ifdef CONFIG_X86_LOCAL_APIC | |
42e0a9aa | 518 | static u32 xen_apic_read(unsigned long reg) |
5ead97c8 JF |
519 | { |
520 | return 0; | |
521 | } | |
f87e4cac | 522 | |
42e0a9aa | 523 | static void xen_apic_write(unsigned long reg, u32 val) |
f87e4cac JF |
524 | { |
525 | /* Warn to see if there's any stray references */ | |
526 | WARN_ON(1); | |
527 | } | |
5ead97c8 JF |
528 | #endif |
529 | ||
530 | static void xen_flush_tlb(void) | |
531 | { | |
d66bf8fc JF |
532 | struct mmuext_op *op; |
533 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 534 | |
d66bf8fc JF |
535 | op = mcs.args; |
536 | op->cmd = MMUEXT_TLB_FLUSH_LOCAL; | |
537 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
538 | ||
539 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
540 | } |
541 | ||
542 | static void xen_flush_tlb_single(unsigned long addr) | |
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_INVLPG_LOCAL; | |
549 | op->arg1.linear_addr = addr & PAGE_MASK; | |
550 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
551 | ||
552 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
5ead97c8 JF |
553 | } |
554 | ||
f87e4cac JF |
555 | static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, |
556 | unsigned long va) | |
557 | { | |
d66bf8fc JF |
558 | struct { |
559 | struct mmuext_op op; | |
560 | cpumask_t mask; | |
561 | } *args; | |
f87e4cac | 562 | cpumask_t cpumask = *cpus; |
d66bf8fc | 563 | struct multicall_space mcs; |
f87e4cac JF |
564 | |
565 | /* | |
566 | * A couple of (to be removed) sanity checks: | |
567 | * | |
568 | * - current CPU must not be in mask | |
569 | * - mask must exist :) | |
570 | */ | |
571 | BUG_ON(cpus_empty(cpumask)); | |
572 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); | |
573 | BUG_ON(!mm); | |
574 | ||
575 | /* If a CPU which we ran on has gone down, OK. */ | |
576 | cpus_and(cpumask, cpumask, cpu_online_map); | |
577 | if (cpus_empty(cpumask)) | |
578 | return; | |
579 | ||
d66bf8fc JF |
580 | mcs = xen_mc_entry(sizeof(*args)); |
581 | args = mcs.args; | |
582 | args->mask = cpumask; | |
583 | args->op.arg2.vcpumask = &args->mask; | |
584 | ||
f87e4cac | 585 | if (va == TLB_FLUSH_ALL) { |
d66bf8fc | 586 | args->op.cmd = MMUEXT_TLB_FLUSH_MULTI; |
f87e4cac | 587 | } else { |
d66bf8fc JF |
588 | args->op.cmd = MMUEXT_INVLPG_MULTI; |
589 | args->op.arg1.linear_addr = va; | |
f87e4cac JF |
590 | } |
591 | ||
d66bf8fc JF |
592 | MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); |
593 | ||
594 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
f87e4cac JF |
595 | } |
596 | ||
60223a32 JF |
597 | static void xen_write_cr2(unsigned long cr2) |
598 | { | |
599 | x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; | |
600 | } | |
601 | ||
5ead97c8 JF |
602 | static unsigned long xen_read_cr2(void) |
603 | { | |
604 | return x86_read_percpu(xen_vcpu)->arch.cr2; | |
605 | } | |
606 | ||
60223a32 JF |
607 | static unsigned long xen_read_cr2_direct(void) |
608 | { | |
609 | return x86_read_percpu(xen_vcpu_info.arch.cr2); | |
610 | } | |
611 | ||
5ead97c8 JF |
612 | static void xen_write_cr4(unsigned long cr4) |
613 | { | |
389a3c02 JF |
614 | /* Just ignore cr4 changes; Xen doesn't allow us to do |
615 | anything anyway. */ | |
5ead97c8 JF |
616 | } |
617 | ||
5ead97c8 JF |
618 | static unsigned long xen_read_cr3(void) |
619 | { | |
620 | return x86_read_percpu(xen_cr3); | |
621 | } | |
622 | ||
9f79991d JF |
623 | static void set_current_cr3(void *v) |
624 | { | |
625 | x86_write_percpu(xen_current_cr3, (unsigned long)v); | |
626 | } | |
627 | ||
5ead97c8 JF |
628 | static void xen_write_cr3(unsigned long cr3) |
629 | { | |
9f79991d JF |
630 | struct mmuext_op *op; |
631 | struct multicall_space mcs; | |
632 | unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3)); | |
633 | ||
f120f13e JF |
634 | BUG_ON(preemptible()); |
635 | ||
9f79991d | 636 | mcs = xen_mc_entry(sizeof(*op)); /* disables interrupts */ |
5ead97c8 | 637 | |
9f79991d JF |
638 | /* Update while interrupts are disabled, so its atomic with |
639 | respect to ipis */ | |
5ead97c8 JF |
640 | x86_write_percpu(xen_cr3, cr3); |
641 | ||
9f79991d JF |
642 | op = mcs.args; |
643 | op->cmd = MMUEXT_NEW_BASEPTR; | |
644 | op->arg1.mfn = mfn; | |
5ead97c8 | 645 | |
9f79991d | 646 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
5ead97c8 | 647 | |
9f79991d JF |
648 | /* Update xen_update_cr3 once the batch has actually |
649 | been submitted. */ | |
650 | xen_mc_callback(set_current_cr3, (void *)cr3); | |
5ead97c8 | 651 | |
9f79991d | 652 | xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */ |
5ead97c8 JF |
653 | } |
654 | ||
f4f97b3e JF |
655 | /* Early in boot, while setting up the initial pagetable, assume |
656 | everything is pinned. */ | |
9a4029fd | 657 | static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn) |
5ead97c8 | 658 | { |
f4f97b3e | 659 | BUG_ON(mem_map); /* should only be used early */ |
5ead97c8 JF |
660 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
661 | } | |
662 | ||
1c70e9bd JF |
663 | /* Early release_pt assumes that all pts are pinned, since there's |
664 | only init_mm and anything attached to that is pinned. */ | |
665 | static void xen_release_pt_init(u32 pfn) | |
666 | { | |
667 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); | |
668 | } | |
669 | ||
f6433706 | 670 | static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn) |
74260714 JF |
671 | { |
672 | struct mmuext_op op; | |
f6433706 | 673 | op.cmd = cmd; |
74260714 JF |
674 | op.arg1.mfn = pfn_to_mfn(pfn); |
675 | if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) | |
676 | BUG(); | |
677 | } | |
678 | ||
f4f97b3e JF |
679 | /* This needs to make sure the new pte page is pinned iff its being |
680 | attached to a pinned pagetable. */ | |
1c70e9bd | 681 | static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level) |
5ead97c8 | 682 | { |
f4f97b3e | 683 | struct page *page = pfn_to_page(pfn); |
5ead97c8 | 684 | |
f4f97b3e JF |
685 | if (PagePinned(virt_to_page(mm->pgd))) { |
686 | SetPagePinned(page); | |
687 | ||
74260714 | 688 | if (!PageHighMem(page)) { |
f4f97b3e | 689 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
f6433706 MM |
690 | if (level == PT_PTE) |
691 | pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); | |
74260714 | 692 | } else |
f4f97b3e JF |
693 | /* make sure there are no stray mappings of |
694 | this page */ | |
695 | kmap_flush_unused(); | |
696 | } | |
5ead97c8 JF |
697 | } |
698 | ||
1c70e9bd JF |
699 | static void xen_alloc_pt(struct mm_struct *mm, u32 pfn) |
700 | { | |
f6433706 | 701 | xen_alloc_ptpage(mm, pfn, PT_PTE); |
1c70e9bd JF |
702 | } |
703 | ||
704 | static void xen_alloc_pd(struct mm_struct *mm, u32 pfn) | |
705 | { | |
f6433706 | 706 | xen_alloc_ptpage(mm, pfn, PT_PMD); |
1c70e9bd JF |
707 | } |
708 | ||
f4f97b3e | 709 | /* This should never happen until we're OK to use struct page */ |
f6433706 | 710 | static void xen_release_ptpage(u32 pfn, unsigned level) |
5ead97c8 | 711 | { |
f4f97b3e JF |
712 | struct page *page = pfn_to_page(pfn); |
713 | ||
714 | if (PagePinned(page)) { | |
74260714 | 715 | if (!PageHighMem(page)) { |
a684d69d MM |
716 | if (level == PT_PTE) |
717 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); | |
f4f97b3e | 718 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); |
74260714 | 719 | } |
c946c7de | 720 | ClearPagePinned(page); |
f4f97b3e | 721 | } |
5ead97c8 JF |
722 | } |
723 | ||
f6433706 MM |
724 | static void xen_release_pt(u32 pfn) |
725 | { | |
726 | xen_release_ptpage(pfn, PT_PTE); | |
727 | } | |
728 | ||
729 | static void xen_release_pd(u32 pfn) | |
730 | { | |
731 | xen_release_ptpage(pfn, PT_PMD); | |
732 | } | |
733 | ||
f4f97b3e JF |
734 | #ifdef CONFIG_HIGHPTE |
735 | static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) | |
5ead97c8 | 736 | { |
f4f97b3e JF |
737 | pgprot_t prot = PAGE_KERNEL; |
738 | ||
739 | if (PagePinned(page)) | |
740 | prot = PAGE_KERNEL_RO; | |
741 | ||
742 | if (0 && PageHighMem(page)) | |
743 | printk("mapping highpte %lx type %d prot %s\n", | |
744 | page_to_pfn(page), type, | |
745 | (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); | |
746 | ||
747 | return kmap_atomic_prot(page, type, prot); | |
5ead97c8 | 748 | } |
f4f97b3e | 749 | #endif |
5ead97c8 | 750 | |
9a4029fd JF |
751 | static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) |
752 | { | |
753 | /* If there's an existing pte, then don't allow _PAGE_RW to be set */ | |
754 | if (pte_val_ma(*ptep) & _PAGE_PRESENT) | |
755 | pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & | |
756 | pte_val_ma(pte)); | |
757 | ||
758 | return pte; | |
759 | } | |
760 | ||
761 | /* Init-time set_pte while constructing initial pagetables, which | |
762 | doesn't allow RO pagetable pages to be remapped RW */ | |
763 | static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) | |
764 | { | |
765 | pte = mask_rw_pte(ptep, pte); | |
766 | ||
767 | xen_set_pte(ptep, pte); | |
768 | } | |
769 | ||
5ead97c8 JF |
770 | static __init void xen_pagetable_setup_start(pgd_t *base) |
771 | { | |
772 | pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base; | |
773 | ||
9a4029fd | 774 | /* special set_pte for pagetable initialization */ |
93b1eab3 | 775 | pv_mmu_ops.set_pte = xen_set_pte_init; |
9a4029fd | 776 | |
5ead97c8 JF |
777 | init_mm.pgd = base; |
778 | /* | |
779 | * copy top-level of Xen-supplied pagetable into place. For | |
780 | * !PAE we can use this as-is, but for PAE it is a stand-in | |
781 | * while we copy the pmd pages. | |
782 | */ | |
783 | memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t)); | |
784 | ||
785 | if (PTRS_PER_PMD > 1) { | |
786 | int i; | |
787 | /* | |
788 | * For PAE, need to allocate new pmds, rather than | |
789 | * share Xen's, since Xen doesn't like pmd's being | |
790 | * shared between address spaces. | |
791 | */ | |
792 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
793 | if (pgd_val_ma(xen_pgd[i]) & _PAGE_PRESENT) { | |
794 | pmd_t *pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
795 | ||
796 | memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]), | |
797 | PAGE_SIZE); | |
798 | ||
f4f97b3e | 799 | make_lowmem_page_readonly(pmd); |
5ead97c8 JF |
800 | |
801 | set_pgd(&base[i], __pgd(1 + __pa(pmd))); | |
802 | } else | |
803 | pgd_clear(&base[i]); | |
804 | } | |
805 | } | |
806 | ||
807 | /* make sure zero_page is mapped RO so we can use it in pagetables */ | |
808 | make_lowmem_page_readonly(empty_zero_page); | |
809 | make_lowmem_page_readonly(base); | |
810 | /* | |
811 | * Switch to new pagetable. This is done before | |
812 | * pagetable_init has done anything so that the new pages | |
813 | * added to the table can be prepared properly for Xen. | |
814 | */ | |
815 | xen_write_cr3(__pa(base)); | |
2b540781 JF |
816 | |
817 | /* Unpin initial Xen pagetable */ | |
818 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, | |
819 | PFN_DOWN(__pa(xen_start_info->pt_base))); | |
5ead97c8 JF |
820 | } |
821 | ||
2e8fe719 | 822 | static __init void setup_shared_info(void) |
5ead97c8 JF |
823 | { |
824 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
2e8fe719 JF |
825 | unsigned long addr = fix_to_virt(FIX_PARAVIRT_BOOTMAP); |
826 | ||
5ead97c8 JF |
827 | /* |
828 | * Create a mapping for the shared info page. | |
829 | * Should be set_fixmap(), but shared_info is a machine | |
830 | * address with no corresponding pseudo-phys address. | |
831 | */ | |
2e8fe719 | 832 | set_pte_mfn(addr, |
5ead97c8 JF |
833 | PFN_DOWN(xen_start_info->shared_info), |
834 | PAGE_KERNEL); | |
5ead97c8 | 835 | |
2e8fe719 | 836 | HYPERVISOR_shared_info = (struct shared_info *)addr; |
5ead97c8 JF |
837 | } else |
838 | HYPERVISOR_shared_info = | |
839 | (struct shared_info *)__va(xen_start_info->shared_info); | |
840 | ||
2e8fe719 JF |
841 | #ifndef CONFIG_SMP |
842 | /* In UP this is as good a place as any to set up shared info */ | |
843 | xen_setup_vcpu_info_placement(); | |
844 | #endif | |
845 | } | |
846 | ||
847 | static __init void xen_pagetable_setup_done(pgd_t *base) | |
848 | { | |
849 | /* This will work as long as patching hasn't happened yet | |
850 | (which it hasn't) */ | |
851 | pv_mmu_ops.alloc_pt = xen_alloc_pt; | |
852 | pv_mmu_ops.alloc_pd = xen_alloc_pd; | |
853 | pv_mmu_ops.release_pt = xen_release_pt; | |
f6433706 | 854 | pv_mmu_ops.release_pd = xen_release_pd; |
2e8fe719 JF |
855 | pv_mmu_ops.set_pte = xen_set_pte; |
856 | ||
857 | setup_shared_info(); | |
858 | ||
f4f97b3e JF |
859 | /* Actually pin the pagetable down, but we can't set PG_pinned |
860 | yet because the page structures don't exist yet. */ | |
861 | { | |
74260714 JF |
862 | unsigned level; |
863 | ||
f4f97b3e | 864 | #ifdef CONFIG_X86_PAE |
74260714 | 865 | level = MMUEXT_PIN_L3_TABLE; |
f4f97b3e | 866 | #else |
74260714 | 867 | level = MMUEXT_PIN_L2_TABLE; |
f4f97b3e | 868 | #endif |
74260714 JF |
869 | |
870 | pin_pagetable_pfn(level, PFN_DOWN(__pa(base))); | |
f4f97b3e | 871 | } |
60223a32 | 872 | } |
5ead97c8 | 873 | |
60223a32 JF |
874 | /* This is called once we have the cpu_possible_map */ |
875 | void __init xen_setup_vcpu_info_placement(void) | |
876 | { | |
877 | int cpu; | |
878 | ||
879 | for_each_possible_cpu(cpu) | |
880 | xen_vcpu_setup(cpu); | |
881 | ||
882 | /* xen_vcpu_setup managed to place the vcpu_info within the | |
883 | percpu area for all cpus, so make use of it */ | |
884 | if (have_vcpu_info_placement) { | |
885 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); | |
886 | ||
93b1eab3 JF |
887 | pv_irq_ops.save_fl = xen_save_fl_direct; |
888 | pv_irq_ops.restore_fl = xen_restore_fl_direct; | |
889 | pv_irq_ops.irq_disable = xen_irq_disable_direct; | |
890 | pv_irq_ops.irq_enable = xen_irq_enable_direct; | |
891 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; | |
892 | pv_cpu_ops.iret = xen_iret_direct; | |
60223a32 | 893 | } |
5ead97c8 JF |
894 | } |
895 | ||
ab144f5e AK |
896 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
897 | unsigned long addr, unsigned len) | |
6487673b JF |
898 | { |
899 | char *start, *end, *reloc; | |
900 | unsigned ret; | |
901 | ||
902 | start = end = reloc = NULL; | |
903 | ||
93b1eab3 JF |
904 | #define SITE(op, x) \ |
905 | case PARAVIRT_PATCH(op.x): \ | |
6487673b JF |
906 | if (have_vcpu_info_placement) { \ |
907 | start = (char *)xen_##x##_direct; \ | |
908 | end = xen_##x##_direct_end; \ | |
909 | reloc = xen_##x##_direct_reloc; \ | |
910 | } \ | |
911 | goto patch_site | |
912 | ||
913 | switch (type) { | |
93b1eab3 JF |
914 | SITE(pv_irq_ops, irq_enable); |
915 | SITE(pv_irq_ops, irq_disable); | |
916 | SITE(pv_irq_ops, save_fl); | |
917 | SITE(pv_irq_ops, restore_fl); | |
6487673b JF |
918 | #undef SITE |
919 | ||
920 | patch_site: | |
921 | if (start == NULL || (end-start) > len) | |
922 | goto default_patch; | |
923 | ||
ab144f5e | 924 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
6487673b JF |
925 | |
926 | /* Note: because reloc is assigned from something that | |
927 | appears to be an array, gcc assumes it's non-null, | |
928 | but doesn't know its relationship with start and | |
929 | end. */ | |
930 | if (reloc > start && reloc < end) { | |
931 | int reloc_off = reloc - start; | |
ab144f5e AK |
932 | long *relocp = (long *)(insnbuf + reloc_off); |
933 | long delta = start - (char *)addr; | |
6487673b JF |
934 | |
935 | *relocp += delta; | |
936 | } | |
937 | break; | |
938 | ||
939 | default_patch: | |
940 | default: | |
ab144f5e AK |
941 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
942 | addr, len); | |
6487673b JF |
943 | break; |
944 | } | |
945 | ||
946 | return ret; | |
947 | } | |
948 | ||
93b1eab3 | 949 | static const struct pv_info xen_info __initdata = { |
5ead97c8 JF |
950 | .paravirt_enabled = 1, |
951 | .shared_kernel_pmd = 0, | |
952 | ||
953 | .name = "Xen", | |
93b1eab3 | 954 | }; |
5ead97c8 | 955 | |
93b1eab3 | 956 | static const struct pv_init_ops xen_init_ops __initdata = { |
6487673b | 957 | .patch = xen_patch, |
5ead97c8 | 958 | |
93b1eab3 | 959 | .banner = xen_banner, |
5ead97c8 JF |
960 | .memory_setup = xen_memory_setup, |
961 | .arch_setup = xen_arch_setup, | |
f4f97b3e | 962 | .post_allocator_init = xen_mark_init_mm_pinned, |
93b1eab3 | 963 | }; |
5ead97c8 | 964 | |
93b1eab3 | 965 | static const struct pv_time_ops xen_time_ops __initdata = { |
15c84731 | 966 | .time_init = xen_time_init, |
93b1eab3 | 967 | |
15c84731 JF |
968 | .set_wallclock = xen_set_wallclock, |
969 | .get_wallclock = xen_get_wallclock, | |
970 | .get_cpu_khz = xen_cpu_khz, | |
ab550288 | 971 | .sched_clock = xen_sched_clock, |
93b1eab3 | 972 | }; |
15c84731 | 973 | |
93b1eab3 | 974 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
5ead97c8 JF |
975 | .cpuid = xen_cpuid, |
976 | ||
977 | .set_debugreg = xen_set_debugreg, | |
978 | .get_debugreg = xen_get_debugreg, | |
979 | ||
980 | .clts = native_clts, | |
981 | ||
982 | .read_cr0 = native_read_cr0, | |
983 | .write_cr0 = native_write_cr0, | |
984 | ||
5ead97c8 JF |
985 | .read_cr4 = native_read_cr4, |
986 | .read_cr4_safe = native_read_cr4_safe, | |
987 | .write_cr4 = xen_write_cr4, | |
988 | ||
5ead97c8 JF |
989 | .wbinvd = native_wbinvd, |
990 | ||
991 | .read_msr = native_read_msr_safe, | |
992 | .write_msr = native_write_msr_safe, | |
993 | .read_tsc = native_read_tsc, | |
994 | .read_pmc = native_read_pmc, | |
995 | ||
996 | .iret = (void *)&hypercall_page[__HYPERVISOR_iret], | |
6abcd98f | 997 | .irq_enable_syscall_ret = NULL, /* never called */ |
5ead97c8 JF |
998 | |
999 | .load_tr_desc = paravirt_nop, | |
1000 | .set_ldt = xen_set_ldt, | |
1001 | .load_gdt = xen_load_gdt, | |
1002 | .load_idt = xen_load_idt, | |
1003 | .load_tls = xen_load_tls, | |
1004 | ||
1005 | .store_gdt = native_store_gdt, | |
1006 | .store_idt = native_store_idt, | |
1007 | .store_tr = xen_store_tr, | |
1008 | ||
1009 | .write_ldt_entry = xen_write_ldt_entry, | |
1010 | .write_gdt_entry = xen_write_gdt_entry, | |
1011 | .write_idt_entry = xen_write_idt_entry, | |
faca6227 | 1012 | .load_sp0 = xen_load_sp0, |
5ead97c8 JF |
1013 | |
1014 | .set_iopl_mask = xen_set_iopl_mask, | |
1015 | .io_delay = xen_io_delay, | |
1016 | ||
8965c1c0 JF |
1017 | .lazy_mode = { |
1018 | .enter = paravirt_enter_lazy_cpu, | |
1019 | .leave = xen_leave_lazy, | |
1020 | }, | |
93b1eab3 JF |
1021 | }; |
1022 | ||
1023 | static const struct pv_irq_ops xen_irq_ops __initdata = { | |
1024 | .init_IRQ = xen_init_IRQ, | |
1025 | .save_fl = xen_save_fl, | |
1026 | .restore_fl = xen_restore_fl, | |
1027 | .irq_disable = xen_irq_disable, | |
1028 | .irq_enable = xen_irq_enable, | |
1029 | .safe_halt = xen_safe_halt, | |
1030 | .halt = xen_halt, | |
1031 | }; | |
5ead97c8 | 1032 | |
93b1eab3 | 1033 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
5ead97c8 | 1034 | #ifdef CONFIG_X86_LOCAL_APIC |
f87e4cac JF |
1035 | .apic_write = xen_apic_write, |
1036 | .apic_write_atomic = xen_apic_write, | |
5ead97c8 JF |
1037 | .apic_read = xen_apic_read, |
1038 | .setup_boot_clock = paravirt_nop, | |
1039 | .setup_secondary_clock = paravirt_nop, | |
1040 | .startup_ipi_hook = paravirt_nop, | |
1041 | #endif | |
93b1eab3 JF |
1042 | }; |
1043 | ||
1044 | static const struct pv_mmu_ops xen_mmu_ops __initdata = { | |
1045 | .pagetable_setup_start = xen_pagetable_setup_start, | |
1046 | .pagetable_setup_done = xen_pagetable_setup_done, | |
1047 | ||
1048 | .read_cr2 = xen_read_cr2, | |
1049 | .write_cr2 = xen_write_cr2, | |
1050 | ||
1051 | .read_cr3 = xen_read_cr3, | |
1052 | .write_cr3 = xen_write_cr3, | |
5ead97c8 JF |
1053 | |
1054 | .flush_tlb_user = xen_flush_tlb, | |
1055 | .flush_tlb_kernel = xen_flush_tlb, | |
1056 | .flush_tlb_single = xen_flush_tlb_single, | |
f87e4cac | 1057 | .flush_tlb_others = xen_flush_tlb_others, |
5ead97c8 JF |
1058 | |
1059 | .pte_update = paravirt_nop, | |
1060 | .pte_update_defer = paravirt_nop, | |
1061 | ||
f4f97b3e | 1062 | .alloc_pt = xen_alloc_pt_init, |
1c70e9bd JF |
1063 | .release_pt = xen_release_pt_init, |
1064 | .alloc_pd = xen_alloc_pt_init, | |
f4f97b3e | 1065 | .alloc_pd_clone = paravirt_nop, |
1c70e9bd | 1066 | .release_pd = xen_release_pt_init, |
f4f97b3e JF |
1067 | |
1068 | #ifdef CONFIG_HIGHPTE | |
1069 | .kmap_atomic_pte = xen_kmap_atomic_pte, | |
1070 | #endif | |
5ead97c8 | 1071 | |
9a4029fd | 1072 | .set_pte = NULL, /* see xen_pagetable_setup_* */ |
3b827c1b JF |
1073 | .set_pte_at = xen_set_pte_at, |
1074 | .set_pmd = xen_set_pmd, | |
1075 | ||
1076 | .pte_val = xen_pte_val, | |
1077 | .pgd_val = xen_pgd_val, | |
1078 | ||
1079 | .make_pte = xen_make_pte, | |
1080 | .make_pgd = xen_make_pgd, | |
1081 | ||
1082 | #ifdef CONFIG_X86_PAE | |
1083 | .set_pte_atomic = xen_set_pte_atomic, | |
1084 | .set_pte_present = xen_set_pte_at, | |
1085 | .set_pud = xen_set_pud, | |
1086 | .pte_clear = xen_pte_clear, | |
1087 | .pmd_clear = xen_pmd_clear, | |
1088 | ||
1089 | .make_pmd = xen_make_pmd, | |
1090 | .pmd_val = xen_pmd_val, | |
1091 | #endif /* PAE */ | |
1092 | ||
1093 | .activate_mm = xen_activate_mm, | |
1094 | .dup_mmap = xen_dup_mmap, | |
1095 | .exit_mmap = xen_exit_mmap, | |
1096 | ||
8965c1c0 JF |
1097 | .lazy_mode = { |
1098 | .enter = paravirt_enter_lazy_mmu, | |
1099 | .leave = xen_leave_lazy, | |
1100 | }, | |
5ead97c8 JF |
1101 | }; |
1102 | ||
f87e4cac JF |
1103 | #ifdef CONFIG_SMP |
1104 | static const struct smp_ops xen_smp_ops __initdata = { | |
1105 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, | |
1106 | .smp_prepare_cpus = xen_smp_prepare_cpus, | |
1107 | .cpu_up = xen_cpu_up, | |
1108 | .smp_cpus_done = xen_smp_cpus_done, | |
1109 | ||
1110 | .smp_send_stop = xen_smp_send_stop, | |
1111 | .smp_send_reschedule = xen_smp_send_reschedule, | |
1112 | .smp_call_function_mask = xen_smp_call_function_mask, | |
1113 | }; | |
1114 | #endif /* CONFIG_SMP */ | |
1115 | ||
fefa629a JF |
1116 | static void xen_reboot(int reason) |
1117 | { | |
1118 | #ifdef CONFIG_SMP | |
1119 | smp_send_stop(); | |
1120 | #endif | |
1121 | ||
1122 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, reason)) | |
1123 | BUG(); | |
1124 | } | |
1125 | ||
1126 | static void xen_restart(char *msg) | |
1127 | { | |
1128 | xen_reboot(SHUTDOWN_reboot); | |
1129 | } | |
1130 | ||
1131 | static void xen_emergency_restart(void) | |
1132 | { | |
1133 | xen_reboot(SHUTDOWN_reboot); | |
1134 | } | |
1135 | ||
1136 | static void xen_machine_halt(void) | |
1137 | { | |
1138 | xen_reboot(SHUTDOWN_poweroff); | |
1139 | } | |
1140 | ||
1141 | static void xen_crash_shutdown(struct pt_regs *regs) | |
1142 | { | |
1143 | xen_reboot(SHUTDOWN_crash); | |
1144 | } | |
1145 | ||
1146 | static const struct machine_ops __initdata xen_machine_ops = { | |
1147 | .restart = xen_restart, | |
1148 | .halt = xen_machine_halt, | |
1149 | .power_off = xen_machine_halt, | |
1150 | .shutdown = xen_machine_halt, | |
1151 | .crash_shutdown = xen_crash_shutdown, | |
1152 | .emergency_restart = xen_emergency_restart, | |
1153 | }; | |
1154 | ||
6487673b | 1155 | |
fb1d8404 JF |
1156 | static void __init xen_reserve_top(void) |
1157 | { | |
1158 | unsigned long top = HYPERVISOR_VIRT_START; | |
1159 | struct xen_platform_parameters pp; | |
1160 | ||
1161 | if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) | |
1162 | top = pp.virt_start; | |
1163 | ||
1164 | reserve_top_address(-top + 2 * PAGE_SIZE); | |
1165 | } | |
1166 | ||
5ead97c8 JF |
1167 | /* First C function to be called on Xen boot */ |
1168 | asmlinkage void __init xen_start_kernel(void) | |
1169 | { | |
1170 | pgd_t *pgd; | |
1171 | ||
1172 | if (!xen_start_info) | |
1173 | return; | |
1174 | ||
7999f4b4 | 1175 | BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); |
5ead97c8 JF |
1176 | |
1177 | /* Install Xen paravirt ops */ | |
93b1eab3 JF |
1178 | pv_info = xen_info; |
1179 | pv_init_ops = xen_init_ops; | |
1180 | pv_time_ops = xen_time_ops; | |
1181 | pv_cpu_ops = xen_cpu_ops; | |
1182 | pv_irq_ops = xen_irq_ops; | |
1183 | pv_apic_ops = xen_apic_ops; | |
1184 | pv_mmu_ops = xen_mmu_ops; | |
93b1eab3 | 1185 | |
fefa629a JF |
1186 | machine_ops = xen_machine_ops; |
1187 | ||
f87e4cac JF |
1188 | #ifdef CONFIG_SMP |
1189 | smp_ops = xen_smp_ops; | |
1190 | #endif | |
5ead97c8 JF |
1191 | |
1192 | xen_setup_features(); | |
1193 | ||
1194 | /* Get mfn list */ | |
1195 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
1196 | phys_to_machine_mapping = (unsigned long *)xen_start_info->mfn_list; | |
1197 | ||
1198 | pgd = (pgd_t *)xen_start_info->pt_base; | |
1199 | ||
1200 | init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; | |
1201 | ||
1202 | init_mm.pgd = pgd; /* use the Xen pagetables to start */ | |
1203 | ||
1204 | /* keep using Xen gdt for now; no urgent need to change it */ | |
1205 | ||
1206 | x86_write_percpu(xen_cr3, __pa(pgd)); | |
9f79991d | 1207 | x86_write_percpu(xen_current_cr3, __pa(pgd)); |
60223a32 | 1208 | |
60223a32 | 1209 | /* Don't do the full vcpu_info placement stuff until we have a |
2e8fe719 | 1210 | possible map and a non-dummy shared_info. */ |
60223a32 | 1211 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
5ead97c8 | 1212 | |
93b1eab3 | 1213 | pv_info.kernel_rpl = 1; |
5ead97c8 | 1214 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
93b1eab3 | 1215 | pv_info.kernel_rpl = 0; |
5ead97c8 JF |
1216 | |
1217 | /* set the limit of our address space */ | |
fb1d8404 | 1218 | xen_reserve_top(); |
5ead97c8 JF |
1219 | |
1220 | /* set up basic CPUID stuff */ | |
1221 | cpu_detect(&new_cpu_data); | |
1222 | new_cpu_data.hard_math = 1; | |
1223 | new_cpu_data.x86_capability[0] = cpuid_edx(1); | |
1224 | ||
1225 | /* Poke various useful things into boot_params */ | |
30c82645 PA |
1226 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
1227 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start | |
1228 | ? __pa(xen_start_info->mod_start) : 0; | |
1229 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; | |
5ead97c8 JF |
1230 | |
1231 | /* Start the world */ | |
1232 | start_kernel(); | |
1233 | } |