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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> | |
b8c2d3df | 28 | #include <linux/console.h> |
5ead97c8 JF |
29 | |
30 | #include <xen/interface/xen.h> | |
31 | #include <xen/interface/physdev.h> | |
32 | #include <xen/interface/vcpu.h> | |
33 | #include <xen/features.h> | |
34 | #include <xen/page.h> | |
084a2a4e | 35 | #include <xen/hvc-console.h> |
5ead97c8 JF |
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> | |
1153968a | 43 | #include <asm/msr-index.h> |
5ead97c8 JF |
44 | #include <asm/setup.h> |
45 | #include <asm/desc.h> | |
46 | #include <asm/pgtable.h> | |
f87e4cac | 47 | #include <asm/tlbflush.h> |
fefa629a | 48 | #include <asm/reboot.h> |
5ead97c8 JF |
49 | |
50 | #include "xen-ops.h" | |
3b827c1b | 51 | #include "mmu.h" |
5ead97c8 JF |
52 | #include "multicalls.h" |
53 | ||
54 | EXPORT_SYMBOL_GPL(hypercall_page); | |
55 | ||
5ead97c8 JF |
56 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
57 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); | |
9f79991d | 58 | |
bf18bf94 JF |
59 | /* |
60 | * Identity map, in addition to plain kernel map. This needs to be | |
61 | * large enough to allocate page table pages to allocate the rest. | |
62 | * Each page can map 2MB. | |
63 | */ | |
64 | static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss; | |
65 | ||
66 | #ifdef CONFIG_X86_64 | |
67 | /* l3 pud for userspace vsyscall mapping */ | |
68 | static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss; | |
69 | #endif /* CONFIG_X86_64 */ | |
70 | ||
9f79991d JF |
71 | /* |
72 | * Note about cr3 (pagetable base) values: | |
73 | * | |
74 | * xen_cr3 contains the current logical cr3 value; it contains the | |
75 | * last set cr3. This may not be the current effective cr3, because | |
76 | * its update may be being lazily deferred. However, a vcpu looking | |
77 | * at its own cr3 can use this value knowing that it everything will | |
78 | * be self-consistent. | |
79 | * | |
80 | * xen_current_cr3 contains the actual vcpu cr3; it is set once the | |
81 | * hypercall to set the vcpu cr3 is complete (so it may be a little | |
82 | * out of date, but it will never be set early). If one vcpu is | |
83 | * looking at another vcpu's cr3 value, it should use this variable. | |
84 | */ | |
85 | DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */ | |
86 | DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */ | |
5ead97c8 JF |
87 | |
88 | struct start_info *xen_start_info; | |
89 | EXPORT_SYMBOL_GPL(xen_start_info); | |
90 | ||
a0d695c8 | 91 | struct shared_info xen_dummy_shared_info; |
60223a32 JF |
92 | |
93 | /* | |
94 | * Point at some empty memory to start with. We map the real shared_info | |
95 | * page as soon as fixmap is up and running. | |
96 | */ | |
a0d695c8 | 97 | struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; |
60223a32 JF |
98 | |
99 | /* | |
100 | * Flag to determine whether vcpu info placement is available on all | |
101 | * VCPUs. We assume it is to start with, and then set it to zero on | |
102 | * the first failure. This is because it can succeed on some VCPUs | |
103 | * and not others, since it can involve hypervisor memory allocation, | |
104 | * or because the guest failed to guarantee all the appropriate | |
105 | * constraints on all VCPUs (ie buffer can't cross a page boundary). | |
106 | * | |
107 | * Note that any particular CPU may be using a placed vcpu structure, | |
108 | * but we can only optimise if the all are. | |
109 | * | |
110 | * 0: not available, 1: available | |
111 | */ | |
04c44a08 | 112 | static int have_vcpu_info_placement = 1; |
60223a32 | 113 | |
9c7a7942 | 114 | static void xen_vcpu_setup(int cpu) |
5ead97c8 | 115 | { |
60223a32 JF |
116 | struct vcpu_register_vcpu_info info; |
117 | int err; | |
118 | struct vcpu_info *vcpup; | |
119 | ||
a0d695c8 | 120 | BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); |
5ead97c8 | 121 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
60223a32 JF |
122 | |
123 | if (!have_vcpu_info_placement) | |
124 | return; /* already tested, not available */ | |
125 | ||
126 | vcpup = &per_cpu(xen_vcpu_info, cpu); | |
127 | ||
128 | info.mfn = virt_to_mfn(vcpup); | |
129 | info.offset = offset_in_page(vcpup); | |
130 | ||
e3d26976 | 131 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n", |
60223a32 JF |
132 | cpu, vcpup, info.mfn, info.offset); |
133 | ||
134 | /* Check to see if the hypervisor will put the vcpu_info | |
135 | structure where we want it, which allows direct access via | |
136 | a percpu-variable. */ | |
137 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); | |
138 | ||
139 | if (err) { | |
140 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); | |
141 | have_vcpu_info_placement = 0; | |
142 | } else { | |
143 | /* This cpu is using the registered vcpu info, even if | |
144 | later ones fail to. */ | |
145 | per_cpu(xen_vcpu, cpu) = vcpup; | |
6487673b | 146 | |
60223a32 JF |
147 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
148 | cpu, vcpup); | |
149 | } | |
5ead97c8 JF |
150 | } |
151 | ||
9c7a7942 JF |
152 | /* |
153 | * On restore, set the vcpu placement up again. | |
154 | * If it fails, then we're in a bad state, since | |
155 | * we can't back out from using it... | |
156 | */ | |
157 | void xen_vcpu_restore(void) | |
158 | { | |
159 | if (have_vcpu_info_placement) { | |
160 | int cpu; | |
161 | ||
162 | for_each_online_cpu(cpu) { | |
163 | bool other_cpu = (cpu != smp_processor_id()); | |
164 | ||
165 | if (other_cpu && | |
166 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) | |
167 | BUG(); | |
168 | ||
169 | xen_vcpu_setup(cpu); | |
170 | ||
171 | if (other_cpu && | |
172 | HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) | |
173 | BUG(); | |
174 | } | |
175 | ||
176 | BUG_ON(!have_vcpu_info_placement); | |
177 | } | |
178 | } | |
179 | ||
5ead97c8 JF |
180 | static void __init xen_banner(void) |
181 | { | |
95c7c23b JF |
182 | unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL); |
183 | struct xen_extraversion extra; | |
184 | HYPERVISOR_xen_version(XENVER_extraversion, &extra); | |
185 | ||
5ead97c8 | 186 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", |
93b1eab3 | 187 | pv_info.name); |
95c7c23b JF |
188 | printk(KERN_INFO "Xen version: %d.%d%s%s\n", |
189 | version >> 16, version & 0xffff, extra.extraversion, | |
e57778a1 | 190 | xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); |
5ead97c8 JF |
191 | } |
192 | ||
65ea5b03 PA |
193 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
194 | unsigned int *cx, unsigned int *dx) | |
5ead97c8 JF |
195 | { |
196 | unsigned maskedx = ~0; | |
197 | ||
198 | /* | |
199 | * Mask out inconvenient features, to try and disable as many | |
200 | * unsupported kernel subsystems as possible. | |
201 | */ | |
65ea5b03 | 202 | if (*ax == 1) |
5ead97c8 JF |
203 | maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */ |
204 | (1 << X86_FEATURE_ACPI) | /* disable ACPI */ | |
dbe9e994 JF |
205 | (1 << X86_FEATURE_MCE) | /* disable MCE */ |
206 | (1 << X86_FEATURE_MCA) | /* disable MCA */ | |
5ead97c8 JF |
207 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ |
208 | ||
209 | asm(XEN_EMULATE_PREFIX "cpuid" | |
65ea5b03 PA |
210 | : "=a" (*ax), |
211 | "=b" (*bx), | |
212 | "=c" (*cx), | |
213 | "=d" (*dx) | |
214 | : "0" (*ax), "2" (*cx)); | |
215 | *dx &= maskedx; | |
5ead97c8 JF |
216 | } |
217 | ||
218 | static void xen_set_debugreg(int reg, unsigned long val) | |
219 | { | |
220 | HYPERVISOR_set_debugreg(reg, val); | |
221 | } | |
222 | ||
223 | static unsigned long xen_get_debugreg(int reg) | |
224 | { | |
225 | return HYPERVISOR_get_debugreg(reg); | |
226 | } | |
227 | ||
8965c1c0 | 228 | static void xen_leave_lazy(void) |
5ead97c8 | 229 | { |
8965c1c0 | 230 | paravirt_leave_lazy(paravirt_get_lazy_mode()); |
5ead97c8 | 231 | xen_mc_flush(); |
5ead97c8 JF |
232 | } |
233 | ||
234 | static unsigned long xen_store_tr(void) | |
235 | { | |
236 | return 0; | |
237 | } | |
238 | ||
a05d2eba JF |
239 | /* |
240 | * If 'v' is a vmalloc mapping, then find the linear mapping of the | |
241 | * page (if any) and also set its protections to match: | |
242 | */ | |
243 | static void set_aliased_prot(void *v, pgprot_t prot) | |
244 | { | |
245 | int level; | |
246 | pte_t *ptep; | |
247 | pte_t pte; | |
248 | unsigned long pfn; | |
249 | struct page *page; | |
250 | ||
251 | ptep = lookup_address((unsigned long)v, &level); | |
252 | BUG_ON(ptep == NULL); | |
253 | ||
254 | pfn = pte_pfn(*ptep); | |
255 | page = pfn_to_page(pfn); | |
256 | ||
257 | pte = pfn_pte(pfn, prot); | |
258 | ||
259 | if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) | |
260 | BUG(); | |
261 | ||
262 | if (!PageHighMem(page)) { | |
263 | void *av = __va(PFN_PHYS(pfn)); | |
264 | ||
265 | if (av != v) | |
266 | if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0)) | |
267 | BUG(); | |
268 | } else | |
269 | kmap_flush_unused(); | |
270 | } | |
271 | ||
38ffbe66 JF |
272 | static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries) |
273 | { | |
a05d2eba | 274 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
38ffbe66 JF |
275 | int i; |
276 | ||
a05d2eba JF |
277 | for(i = 0; i < entries; i += entries_per_page) |
278 | set_aliased_prot(ldt + i, PAGE_KERNEL_RO); | |
38ffbe66 JF |
279 | } |
280 | ||
281 | static void xen_free_ldt(struct desc_struct *ldt, unsigned entries) | |
282 | { | |
a05d2eba | 283 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
38ffbe66 JF |
284 | int i; |
285 | ||
a05d2eba JF |
286 | for(i = 0; i < entries; i += entries_per_page) |
287 | set_aliased_prot(ldt + i, PAGE_KERNEL); | |
38ffbe66 JF |
288 | } |
289 | ||
5ead97c8 JF |
290 | static void xen_set_ldt(const void *addr, unsigned entries) |
291 | { | |
5ead97c8 JF |
292 | struct mmuext_op *op; |
293 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
294 | ||
295 | op = mcs.args; | |
296 | op->cmd = MMUEXT_SET_LDT; | |
4dbf7af6 | 297 | op->arg1.linear_addr = (unsigned long)addr; |
5ead97c8 JF |
298 | op->arg2.nr_ents = entries; |
299 | ||
300 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
301 | ||
302 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
303 | } | |
304 | ||
6b68f01b | 305 | static void xen_load_gdt(const struct desc_ptr *dtr) |
5ead97c8 JF |
306 | { |
307 | unsigned long *frames; | |
308 | unsigned long va = dtr->address; | |
309 | unsigned int size = dtr->size + 1; | |
310 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
311 | int f; | |
312 | struct multicall_space mcs; | |
313 | ||
314 | /* A GDT can be up to 64k in size, which corresponds to 8192 | |
315 | 8-byte entries, or 16 4k pages.. */ | |
316 | ||
317 | BUG_ON(size > 65536); | |
318 | BUG_ON(va & ~PAGE_MASK); | |
319 | ||
320 | mcs = xen_mc_entry(sizeof(*frames) * pages); | |
321 | frames = mcs.args; | |
322 | ||
323 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { | |
324 | frames[f] = virt_to_mfn(va); | |
325 | make_lowmem_page_readonly((void *)va); | |
326 | } | |
327 | ||
328 | MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct)); | |
329 | ||
330 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
331 | } | |
332 | ||
333 | static void load_TLS_descriptor(struct thread_struct *t, | |
334 | unsigned int cpu, unsigned int i) | |
335 | { | |
336 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
337 | xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); | |
338 | struct multicall_space mc = __xen_mc_entry(0); | |
339 | ||
340 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); | |
341 | } | |
342 | ||
343 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) | |
344 | { | |
8b84ad94 JF |
345 | /* |
346 | * XXX sleazy hack: If we're being called in a lazy-cpu zone, | |
347 | * it means we're in a context switch, and %gs has just been | |
348 | * saved. This means we can zero it out to prevent faults on | |
349 | * exit from the hypervisor if the next process has no %gs. | |
350 | * Either way, it has been saved, and the new value will get | |
351 | * loaded properly. This will go away as soon as Xen has been | |
352 | * modified to not save/restore %gs for normal hypercalls. | |
8a95408e EH |
353 | * |
354 | * On x86_64, this hack is not used for %gs, because gs points | |
355 | * to KERNEL_GS_BASE (and uses it for PDA references), so we | |
356 | * must not zero %gs on x86_64 | |
357 | * | |
358 | * For x86_64, we need to zero %fs, otherwise we may get an | |
359 | * exception between the new %fs descriptor being loaded and | |
360 | * %fs being effectively cleared at __switch_to(). | |
8b84ad94 | 361 | */ |
8a95408e EH |
362 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { |
363 | #ifdef CONFIG_X86_32 | |
8b84ad94 | 364 | loadsegment(gs, 0); |
8a95408e EH |
365 | #else |
366 | loadsegment(fs, 0); | |
367 | #endif | |
368 | } | |
369 | ||
370 | xen_mc_batch(); | |
371 | ||
372 | load_TLS_descriptor(t, cpu, 0); | |
373 | load_TLS_descriptor(t, cpu, 1); | |
374 | load_TLS_descriptor(t, cpu, 2); | |
375 | ||
376 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
5ead97c8 JF |
377 | } |
378 | ||
a8fc1089 EH |
379 | #ifdef CONFIG_X86_64 |
380 | static void xen_load_gs_index(unsigned int idx) | |
381 | { | |
382 | if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx)) | |
383 | BUG(); | |
5ead97c8 | 384 | } |
a8fc1089 | 385 | #endif |
5ead97c8 JF |
386 | |
387 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, | |
75b8bb3e | 388 | const void *ptr) |
5ead97c8 JF |
389 | { |
390 | unsigned long lp = (unsigned long)&dt[entrynum]; | |
a05d2eba | 391 | xmaddr_t mach_lp = arbitrary_virt_to_machine(lp); |
75b8bb3e | 392 | u64 entry = *(u64 *)ptr; |
5ead97c8 | 393 | |
f120f13e JF |
394 | preempt_disable(); |
395 | ||
5ead97c8 JF |
396 | xen_mc_flush(); |
397 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) | |
398 | BUG(); | |
f120f13e JF |
399 | |
400 | preempt_enable(); | |
5ead97c8 JF |
401 | } |
402 | ||
e176d367 | 403 | static int cvt_gate_to_trap(int vector, const gate_desc *val, |
5ead97c8 JF |
404 | struct trap_info *info) |
405 | { | |
e176d367 | 406 | if (val->type != 0xf && val->type != 0xe) |
5ead97c8 JF |
407 | return 0; |
408 | ||
409 | info->vector = vector; | |
e176d367 EH |
410 | info->address = gate_offset(*val); |
411 | info->cs = gate_segment(*val); | |
412 | info->flags = val->dpl; | |
5ead97c8 | 413 | /* interrupt gates clear IF */ |
e176d367 | 414 | if (val->type == 0xe) |
5ead97c8 JF |
415 | info->flags |= 4; |
416 | ||
417 | return 1; | |
418 | } | |
419 | ||
420 | /* Locations of each CPU's IDT */ | |
6b68f01b | 421 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
5ead97c8 JF |
422 | |
423 | /* Set an IDT entry. If the entry is part of the current IDT, then | |
424 | also update Xen. */ | |
8d947344 | 425 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
5ead97c8 | 426 | { |
5ead97c8 | 427 | unsigned long p = (unsigned long)&dt[entrynum]; |
f120f13e JF |
428 | unsigned long start, end; |
429 | ||
430 | preempt_disable(); | |
431 | ||
432 | start = __get_cpu_var(idt_desc).address; | |
433 | end = start + __get_cpu_var(idt_desc).size + 1; | |
5ead97c8 JF |
434 | |
435 | xen_mc_flush(); | |
436 | ||
8d947344 | 437 | native_write_idt_entry(dt, entrynum, g); |
5ead97c8 JF |
438 | |
439 | if (p >= start && (p + 8) <= end) { | |
440 | struct trap_info info[2]; | |
441 | ||
442 | info[1].address = 0; | |
443 | ||
e176d367 | 444 | if (cvt_gate_to_trap(entrynum, g, &info[0])) |
5ead97c8 JF |
445 | if (HYPERVISOR_set_trap_table(info)) |
446 | BUG(); | |
447 | } | |
f120f13e JF |
448 | |
449 | preempt_enable(); | |
5ead97c8 JF |
450 | } |
451 | ||
6b68f01b | 452 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
f87e4cac | 453 | struct trap_info *traps) |
5ead97c8 | 454 | { |
5ead97c8 JF |
455 | unsigned in, out, count; |
456 | ||
e176d367 | 457 | count = (desc->size+1) / sizeof(gate_desc); |
5ead97c8 JF |
458 | BUG_ON(count > 256); |
459 | ||
5ead97c8 | 460 | for (in = out = 0; in < count; in++) { |
e176d367 | 461 | gate_desc *entry = (gate_desc*)(desc->address) + in; |
5ead97c8 | 462 | |
e176d367 | 463 | if (cvt_gate_to_trap(in, entry, &traps[out])) |
5ead97c8 JF |
464 | out++; |
465 | } | |
466 | traps[out].address = 0; | |
f87e4cac JF |
467 | } |
468 | ||
469 | void xen_copy_trap_info(struct trap_info *traps) | |
470 | { | |
6b68f01b | 471 | const struct desc_ptr *desc = &__get_cpu_var(idt_desc); |
f87e4cac JF |
472 | |
473 | xen_convert_trap_info(desc, traps); | |
f87e4cac JF |
474 | } |
475 | ||
476 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we | |
477 | hold a spinlock to protect the static traps[] array (static because | |
478 | it avoids allocation, and saves stack space). */ | |
6b68f01b | 479 | static void xen_load_idt(const struct desc_ptr *desc) |
f87e4cac JF |
480 | { |
481 | static DEFINE_SPINLOCK(lock); | |
482 | static struct trap_info traps[257]; | |
f87e4cac JF |
483 | |
484 | spin_lock(&lock); | |
485 | ||
f120f13e JF |
486 | __get_cpu_var(idt_desc) = *desc; |
487 | ||
f87e4cac | 488 | xen_convert_trap_info(desc, traps); |
5ead97c8 JF |
489 | |
490 | xen_mc_flush(); | |
491 | if (HYPERVISOR_set_trap_table(traps)) | |
492 | BUG(); | |
493 | ||
494 | spin_unlock(&lock); | |
495 | } | |
496 | ||
497 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since | |
498 | they're handled differently. */ | |
499 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, | |
014b15be | 500 | const void *desc, int type) |
5ead97c8 | 501 | { |
f120f13e JF |
502 | preempt_disable(); |
503 | ||
014b15be GOC |
504 | switch (type) { |
505 | case DESC_LDT: | |
506 | case DESC_TSS: | |
5ead97c8 JF |
507 | /* ignore */ |
508 | break; | |
509 | ||
510 | default: { | |
511 | xmaddr_t maddr = virt_to_machine(&dt[entry]); | |
5ead97c8 JF |
512 | |
513 | xen_mc_flush(); | |
014b15be | 514 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
5ead97c8 JF |
515 | BUG(); |
516 | } | |
517 | ||
518 | } | |
f120f13e JF |
519 | |
520 | preempt_enable(); | |
5ead97c8 JF |
521 | } |
522 | ||
faca6227 | 523 | static void xen_load_sp0(struct tss_struct *tss, |
a05d2eba | 524 | struct thread_struct *thread) |
5ead97c8 JF |
525 | { |
526 | struct multicall_space mcs = xen_mc_entry(0); | |
faca6227 | 527 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
5ead97c8 JF |
528 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
529 | } | |
530 | ||
531 | static void xen_set_iopl_mask(unsigned mask) | |
532 | { | |
533 | struct physdev_set_iopl set_iopl; | |
534 | ||
535 | /* Force the change at ring 0. */ | |
536 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; | |
537 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
538 | } | |
539 | ||
540 | static void xen_io_delay(void) | |
541 | { | |
542 | } | |
543 | ||
544 | #ifdef CONFIG_X86_LOCAL_APIC | |
42e0a9aa | 545 | static u32 xen_apic_read(unsigned long reg) |
5ead97c8 JF |
546 | { |
547 | return 0; | |
548 | } | |
f87e4cac | 549 | |
42e0a9aa | 550 | static void xen_apic_write(unsigned long reg, u32 val) |
f87e4cac JF |
551 | { |
552 | /* Warn to see if there's any stray references */ | |
553 | WARN_ON(1); | |
554 | } | |
5ead97c8 JF |
555 | #endif |
556 | ||
557 | static void xen_flush_tlb(void) | |
558 | { | |
d66bf8fc | 559 | struct mmuext_op *op; |
41e332b2 JF |
560 | struct multicall_space mcs; |
561 | ||
562 | preempt_disable(); | |
563 | ||
564 | mcs = xen_mc_entry(sizeof(*op)); | |
5ead97c8 | 565 | |
d66bf8fc JF |
566 | op = mcs.args; |
567 | op->cmd = MMUEXT_TLB_FLUSH_LOCAL; | |
568 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
569 | ||
570 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
41e332b2 JF |
571 | |
572 | preempt_enable(); | |
5ead97c8 JF |
573 | } |
574 | ||
575 | static void xen_flush_tlb_single(unsigned long addr) | |
576 | { | |
d66bf8fc | 577 | struct mmuext_op *op; |
41e332b2 JF |
578 | struct multicall_space mcs; |
579 | ||
580 | preempt_disable(); | |
5ead97c8 | 581 | |
41e332b2 | 582 | mcs = xen_mc_entry(sizeof(*op)); |
d66bf8fc JF |
583 | op = mcs.args; |
584 | op->cmd = MMUEXT_INVLPG_LOCAL; | |
585 | op->arg1.linear_addr = addr & PAGE_MASK; | |
586 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
587 | ||
588 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
41e332b2 JF |
589 | |
590 | preempt_enable(); | |
5ead97c8 JF |
591 | } |
592 | ||
f87e4cac JF |
593 | static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm, |
594 | unsigned long va) | |
595 | { | |
d66bf8fc JF |
596 | struct { |
597 | struct mmuext_op op; | |
598 | cpumask_t mask; | |
599 | } *args; | |
f87e4cac | 600 | cpumask_t cpumask = *cpus; |
d66bf8fc | 601 | struct multicall_space mcs; |
f87e4cac JF |
602 | |
603 | /* | |
604 | * A couple of (to be removed) sanity checks: | |
605 | * | |
606 | * - current CPU must not be in mask | |
607 | * - mask must exist :) | |
608 | */ | |
609 | BUG_ON(cpus_empty(cpumask)); | |
610 | BUG_ON(cpu_isset(smp_processor_id(), cpumask)); | |
611 | BUG_ON(!mm); | |
612 | ||
613 | /* If a CPU which we ran on has gone down, OK. */ | |
614 | cpus_and(cpumask, cpumask, cpu_online_map); | |
615 | if (cpus_empty(cpumask)) | |
616 | return; | |
617 | ||
d66bf8fc JF |
618 | mcs = xen_mc_entry(sizeof(*args)); |
619 | args = mcs.args; | |
620 | args->mask = cpumask; | |
621 | args->op.arg2.vcpumask = &args->mask; | |
622 | ||
f87e4cac | 623 | if (va == TLB_FLUSH_ALL) { |
d66bf8fc | 624 | args->op.cmd = MMUEXT_TLB_FLUSH_MULTI; |
f87e4cac | 625 | } else { |
d66bf8fc JF |
626 | args->op.cmd = MMUEXT_INVLPG_MULTI; |
627 | args->op.arg1.linear_addr = va; | |
f87e4cac JF |
628 | } |
629 | ||
d66bf8fc JF |
630 | MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF); |
631 | ||
632 | xen_mc_issue(PARAVIRT_LAZY_MMU); | |
f87e4cac JF |
633 | } |
634 | ||
7b1333aa JF |
635 | static void xen_clts(void) |
636 | { | |
637 | struct multicall_space mcs; | |
638 | ||
639 | mcs = xen_mc_entry(0); | |
640 | ||
641 | MULTI_fpu_taskswitch(mcs.mc, 0); | |
642 | ||
643 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
644 | } | |
645 | ||
646 | static void xen_write_cr0(unsigned long cr0) | |
647 | { | |
648 | struct multicall_space mcs; | |
649 | ||
650 | /* Only pay attention to cr0.TS; everything else is | |
651 | ignored. */ | |
652 | mcs = xen_mc_entry(0); | |
653 | ||
654 | MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0); | |
655 | ||
656 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
657 | } | |
658 | ||
60223a32 JF |
659 | static void xen_write_cr2(unsigned long cr2) |
660 | { | |
661 | x86_read_percpu(xen_vcpu)->arch.cr2 = cr2; | |
662 | } | |
663 | ||
5ead97c8 JF |
664 | static unsigned long xen_read_cr2(void) |
665 | { | |
666 | return x86_read_percpu(xen_vcpu)->arch.cr2; | |
667 | } | |
668 | ||
60223a32 JF |
669 | static unsigned long xen_read_cr2_direct(void) |
670 | { | |
671 | return x86_read_percpu(xen_vcpu_info.arch.cr2); | |
672 | } | |
673 | ||
5ead97c8 JF |
674 | static void xen_write_cr4(unsigned long cr4) |
675 | { | |
2956a351 JF |
676 | cr4 &= ~X86_CR4_PGE; |
677 | cr4 &= ~X86_CR4_PSE; | |
678 | ||
679 | native_write_cr4(cr4); | |
5ead97c8 JF |
680 | } |
681 | ||
5ead97c8 JF |
682 | static unsigned long xen_read_cr3(void) |
683 | { | |
684 | return x86_read_percpu(xen_cr3); | |
685 | } | |
686 | ||
9f79991d JF |
687 | static void set_current_cr3(void *v) |
688 | { | |
689 | x86_write_percpu(xen_current_cr3, (unsigned long)v); | |
690 | } | |
691 | ||
d6182fbf | 692 | static void __xen_write_cr3(bool kernel, unsigned long cr3) |
5ead97c8 | 693 | { |
9f79991d JF |
694 | struct mmuext_op *op; |
695 | struct multicall_space mcs; | |
d6182fbf | 696 | unsigned long mfn; |
9f79991d | 697 | |
d6182fbf JF |
698 | if (cr3) |
699 | mfn = pfn_to_mfn(PFN_DOWN(cr3)); | |
700 | else | |
701 | mfn = 0; | |
f120f13e | 702 | |
d6182fbf | 703 | WARN_ON(mfn == 0 && kernel); |
5ead97c8 | 704 | |
d6182fbf | 705 | mcs = __xen_mc_entry(sizeof(*op)); |
5ead97c8 | 706 | |
9f79991d | 707 | op = mcs.args; |
d6182fbf | 708 | op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR; |
9f79991d | 709 | op->arg1.mfn = mfn; |
5ead97c8 | 710 | |
9f79991d | 711 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); |
5ead97c8 | 712 | |
d6182fbf JF |
713 | if (kernel) { |
714 | x86_write_percpu(xen_cr3, cr3); | |
715 | ||
716 | /* Update xen_current_cr3 once the batch has actually | |
717 | been submitted. */ | |
718 | xen_mc_callback(set_current_cr3, (void *)cr3); | |
719 | } | |
720 | } | |
721 | ||
722 | static void xen_write_cr3(unsigned long cr3) | |
723 | { | |
724 | BUG_ON(preemptible()); | |
725 | ||
726 | xen_mc_batch(); /* disables interrupts */ | |
727 | ||
728 | /* Update while interrupts are disabled, so its atomic with | |
729 | respect to ipis */ | |
730 | x86_write_percpu(xen_cr3, cr3); | |
731 | ||
732 | __xen_write_cr3(true, cr3); | |
733 | ||
734 | #ifdef CONFIG_X86_64 | |
735 | { | |
736 | pgd_t *user_pgd = xen_get_user_pgd(__va(cr3)); | |
737 | if (user_pgd) | |
738 | __xen_write_cr3(false, __pa(user_pgd)); | |
739 | else | |
740 | __xen_write_cr3(false, 0); | |
741 | } | |
742 | #endif | |
5ead97c8 | 743 | |
9f79991d | 744 | xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */ |
5ead97c8 JF |
745 | } |
746 | ||
1153968a JF |
747 | static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) |
748 | { | |
749 | int ret; | |
750 | ||
751 | ret = 0; | |
752 | ||
753 | switch(msr) { | |
754 | #ifdef CONFIG_X86_64 | |
755 | unsigned which; | |
756 | u64 base; | |
757 | ||
758 | case MSR_FS_BASE: which = SEGBASE_FS; goto set; | |
759 | case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set; | |
760 | case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set; | |
761 | ||
762 | set: | |
763 | base = ((u64)high << 32) | low; | |
764 | if (HYPERVISOR_set_segment_base(which, base) != 0) | |
765 | ret = -EFAULT; | |
766 | break; | |
767 | #endif | |
d89961e2 JF |
768 | |
769 | case MSR_STAR: | |
770 | case MSR_CSTAR: | |
771 | case MSR_LSTAR: | |
772 | case MSR_SYSCALL_MASK: | |
773 | case MSR_IA32_SYSENTER_CS: | |
774 | case MSR_IA32_SYSENTER_ESP: | |
775 | case MSR_IA32_SYSENTER_EIP: | |
776 | /* Fast syscall setup is all done in hypercalls, so | |
777 | these are all ignored. Stub them out here to stop | |
778 | Xen console noise. */ | |
779 | break; | |
780 | ||
1153968a JF |
781 | default: |
782 | ret = native_write_msr_safe(msr, low, high); | |
783 | } | |
784 | ||
785 | return ret; | |
786 | } | |
787 | ||
f4f97b3e JF |
788 | /* Early in boot, while setting up the initial pagetable, assume |
789 | everything is pinned. */ | |
6944a9c8 | 790 | static __init void xen_alloc_pte_init(struct mm_struct *mm, u32 pfn) |
5ead97c8 | 791 | { |
af7ae3b9 | 792 | #ifdef CONFIG_FLATMEM |
f4f97b3e | 793 | BUG_ON(mem_map); /* should only be used early */ |
af7ae3b9 | 794 | #endif |
5ead97c8 JF |
795 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
796 | } | |
797 | ||
6944a9c8 | 798 | /* Early release_pte assumes that all pts are pinned, since there's |
1c70e9bd | 799 | only init_mm and anything attached to that is pinned. */ |
6944a9c8 | 800 | static void xen_release_pte_init(u32 pfn) |
1c70e9bd JF |
801 | { |
802 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); | |
803 | } | |
804 | ||
f6433706 | 805 | static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn) |
74260714 JF |
806 | { |
807 | struct mmuext_op op; | |
f6433706 | 808 | op.cmd = cmd; |
74260714 JF |
809 | op.arg1.mfn = pfn_to_mfn(pfn); |
810 | if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) | |
811 | BUG(); | |
812 | } | |
813 | ||
f4f97b3e JF |
814 | /* This needs to make sure the new pte page is pinned iff its being |
815 | attached to a pinned pagetable. */ | |
1c70e9bd | 816 | static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level) |
5ead97c8 | 817 | { |
f4f97b3e | 818 | struct page *page = pfn_to_page(pfn); |
5ead97c8 | 819 | |
f4f97b3e JF |
820 | if (PagePinned(virt_to_page(mm->pgd))) { |
821 | SetPagePinned(page); | |
822 | ||
74260714 | 823 | if (!PageHighMem(page)) { |
f4f97b3e | 824 | make_lowmem_page_readonly(__va(PFN_PHYS(pfn))); |
f6433706 MM |
825 | if (level == PT_PTE) |
826 | pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn); | |
74260714 | 827 | } else |
f4f97b3e JF |
828 | /* make sure there are no stray mappings of |
829 | this page */ | |
830 | kmap_flush_unused(); | |
831 | } | |
5ead97c8 JF |
832 | } |
833 | ||
6944a9c8 | 834 | static void xen_alloc_pte(struct mm_struct *mm, u32 pfn) |
1c70e9bd | 835 | { |
f6433706 | 836 | xen_alloc_ptpage(mm, pfn, PT_PTE); |
1c70e9bd JF |
837 | } |
838 | ||
6944a9c8 | 839 | static void xen_alloc_pmd(struct mm_struct *mm, u32 pfn) |
1c70e9bd | 840 | { |
f6433706 | 841 | xen_alloc_ptpage(mm, pfn, PT_PMD); |
1c70e9bd JF |
842 | } |
843 | ||
d6182fbf JF |
844 | static int xen_pgd_alloc(struct mm_struct *mm) |
845 | { | |
846 | pgd_t *pgd = mm->pgd; | |
847 | int ret = 0; | |
848 | ||
849 | BUG_ON(PagePinned(virt_to_page(pgd))); | |
850 | ||
851 | #ifdef CONFIG_X86_64 | |
852 | { | |
853 | struct page *page = virt_to_page(pgd); | |
bf18bf94 | 854 | pgd_t *user_pgd; |
d6182fbf JF |
855 | |
856 | BUG_ON(page->private != 0); | |
857 | ||
bf18bf94 JF |
858 | ret = -ENOMEM; |
859 | ||
860 | user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); | |
861 | page->private = (unsigned long)user_pgd; | |
862 | ||
863 | if (user_pgd != NULL) { | |
864 | user_pgd[pgd_index(VSYSCALL_START)] = | |
865 | __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE); | |
866 | ret = 0; | |
867 | } | |
d6182fbf JF |
868 | |
869 | BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd)))); | |
870 | } | |
871 | #endif | |
872 | ||
873 | return ret; | |
874 | } | |
875 | ||
876 | static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd) | |
877 | { | |
878 | #ifdef CONFIG_X86_64 | |
879 | pgd_t *user_pgd = xen_get_user_pgd(pgd); | |
880 | ||
881 | if (user_pgd) | |
882 | free_page((unsigned long)user_pgd); | |
883 | #endif | |
884 | } | |
885 | ||
f4f97b3e | 886 | /* This should never happen until we're OK to use struct page */ |
f6433706 | 887 | static void xen_release_ptpage(u32 pfn, unsigned level) |
5ead97c8 | 888 | { |
f4f97b3e JF |
889 | struct page *page = pfn_to_page(pfn); |
890 | ||
891 | if (PagePinned(page)) { | |
74260714 | 892 | if (!PageHighMem(page)) { |
a684d69d MM |
893 | if (level == PT_PTE) |
894 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn); | |
f4f97b3e | 895 | make_lowmem_page_readwrite(__va(PFN_PHYS(pfn))); |
74260714 | 896 | } |
c946c7de | 897 | ClearPagePinned(page); |
f4f97b3e | 898 | } |
5ead97c8 JF |
899 | } |
900 | ||
6944a9c8 | 901 | static void xen_release_pte(u32 pfn) |
f6433706 MM |
902 | { |
903 | xen_release_ptpage(pfn, PT_PTE); | |
904 | } | |
905 | ||
6944a9c8 | 906 | static void xen_release_pmd(u32 pfn) |
f6433706 MM |
907 | { |
908 | xen_release_ptpage(pfn, PT_PMD); | |
909 | } | |
910 | ||
f6e58732 JF |
911 | #if PAGETABLE_LEVELS == 4 |
912 | static void xen_alloc_pud(struct mm_struct *mm, u32 pfn) | |
913 | { | |
914 | xen_alloc_ptpage(mm, pfn, PT_PUD); | |
915 | } | |
916 | ||
917 | static void xen_release_pud(u32 pfn) | |
918 | { | |
919 | xen_release_ptpage(pfn, PT_PUD); | |
920 | } | |
921 | #endif | |
922 | ||
f4f97b3e JF |
923 | #ifdef CONFIG_HIGHPTE |
924 | static void *xen_kmap_atomic_pte(struct page *page, enum km_type type) | |
5ead97c8 | 925 | { |
f4f97b3e JF |
926 | pgprot_t prot = PAGE_KERNEL; |
927 | ||
928 | if (PagePinned(page)) | |
929 | prot = PAGE_KERNEL_RO; | |
930 | ||
931 | if (0 && PageHighMem(page)) | |
932 | printk("mapping highpte %lx type %d prot %s\n", | |
933 | page_to_pfn(page), type, | |
934 | (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ"); | |
935 | ||
936 | return kmap_atomic_prot(page, type, prot); | |
5ead97c8 | 937 | } |
f4f97b3e | 938 | #endif |
5ead97c8 | 939 | |
9a4029fd JF |
940 | static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte) |
941 | { | |
942 | /* If there's an existing pte, then don't allow _PAGE_RW to be set */ | |
943 | if (pte_val_ma(*ptep) & _PAGE_PRESENT) | |
944 | pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) & | |
945 | pte_val_ma(pte)); | |
946 | ||
947 | return pte; | |
948 | } | |
949 | ||
950 | /* Init-time set_pte while constructing initial pagetables, which | |
951 | doesn't allow RO pagetable pages to be remapped RW */ | |
952 | static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) | |
953 | { | |
954 | pte = mask_rw_pte(ptep, pte); | |
955 | ||
956 | xen_set_pte(ptep, pte); | |
957 | } | |
958 | ||
5ead97c8 JF |
959 | static __init void xen_pagetable_setup_start(pgd_t *base) |
960 | { | |
5ead97c8 JF |
961 | } |
962 | ||
0e91398f | 963 | void xen_setup_shared_info(void) |
5ead97c8 JF |
964 | { |
965 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
15664f96 JF |
966 | set_fixmap(FIX_PARAVIRT_BOOTMAP, |
967 | xen_start_info->shared_info); | |
968 | ||
969 | HYPERVISOR_shared_info = | |
970 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); | |
5ead97c8 JF |
971 | } else |
972 | HYPERVISOR_shared_info = | |
973 | (struct shared_info *)__va(xen_start_info->shared_info); | |
974 | ||
2e8fe719 JF |
975 | #ifndef CONFIG_SMP |
976 | /* In UP this is as good a place as any to set up shared info */ | |
977 | xen_setup_vcpu_info_placement(); | |
978 | #endif | |
d5edbc1f JF |
979 | |
980 | xen_setup_mfn_list_list(); | |
2e8fe719 JF |
981 | } |
982 | ||
983 | static __init void xen_pagetable_setup_done(pgd_t *base) | |
984 | { | |
0e91398f | 985 | xen_setup_shared_info(); |
60223a32 | 986 | } |
5ead97c8 | 987 | |
e2426cf8 JF |
988 | static __init void xen_post_allocator_init(void) |
989 | { | |
8745f8b0 | 990 | pv_mmu_ops.set_pte = xen_set_pte; |
e2426cf8 JF |
991 | pv_mmu_ops.set_pmd = xen_set_pmd; |
992 | pv_mmu_ops.set_pud = xen_set_pud; | |
f6e58732 JF |
993 | #if PAGETABLE_LEVELS == 4 |
994 | pv_mmu_ops.set_pgd = xen_set_pgd; | |
995 | #endif | |
e2426cf8 | 996 | |
2e8fe719 JF |
997 | /* This will work as long as patching hasn't happened yet |
998 | (which it hasn't) */ | |
6944a9c8 JF |
999 | pv_mmu_ops.alloc_pte = xen_alloc_pte; |
1000 | pv_mmu_ops.alloc_pmd = xen_alloc_pmd; | |
1001 | pv_mmu_ops.release_pte = xen_release_pte; | |
1002 | pv_mmu_ops.release_pmd = xen_release_pmd; | |
8745f8b0 JF |
1003 | #if PAGETABLE_LEVELS == 4 |
1004 | pv_mmu_ops.alloc_pud = xen_alloc_pud; | |
1005 | pv_mmu_ops.release_pud = xen_release_pud; | |
1006 | #endif | |
e2426cf8 | 1007 | |
bf18bf94 JF |
1008 | #ifdef CONFIG_X86_64 |
1009 | SetPagePinned(virt_to_page(level3_user_vsyscall)); | |
1010 | #endif | |
e2426cf8 JF |
1011 | xen_mark_init_mm_pinned(); |
1012 | } | |
1013 | ||
60223a32 | 1014 | /* This is called once we have the cpu_possible_map */ |
0e91398f | 1015 | void xen_setup_vcpu_info_placement(void) |
60223a32 JF |
1016 | { |
1017 | int cpu; | |
1018 | ||
1019 | for_each_possible_cpu(cpu) | |
1020 | xen_vcpu_setup(cpu); | |
1021 | ||
1022 | /* xen_vcpu_setup managed to place the vcpu_info within the | |
1023 | percpu area for all cpus, so make use of it */ | |
5b09b287 | 1024 | #ifdef CONFIG_X86_32 |
60223a32 JF |
1025 | if (have_vcpu_info_placement) { |
1026 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); | |
1027 | ||
93b1eab3 JF |
1028 | pv_irq_ops.save_fl = xen_save_fl_direct; |
1029 | pv_irq_ops.restore_fl = xen_restore_fl_direct; | |
1030 | pv_irq_ops.irq_disable = xen_irq_disable_direct; | |
1031 | pv_irq_ops.irq_enable = xen_irq_enable_direct; | |
1032 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; | |
60223a32 | 1033 | } |
5b09b287 | 1034 | #endif |
5ead97c8 JF |
1035 | } |
1036 | ||
ab144f5e AK |
1037 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
1038 | unsigned long addr, unsigned len) | |
6487673b JF |
1039 | { |
1040 | char *start, *end, *reloc; | |
1041 | unsigned ret; | |
1042 | ||
1043 | start = end = reloc = NULL; | |
1044 | ||
93b1eab3 JF |
1045 | #define SITE(op, x) \ |
1046 | case PARAVIRT_PATCH(op.x): \ | |
6487673b JF |
1047 | if (have_vcpu_info_placement) { \ |
1048 | start = (char *)xen_##x##_direct; \ | |
1049 | end = xen_##x##_direct_end; \ | |
1050 | reloc = xen_##x##_direct_reloc; \ | |
1051 | } \ | |
1052 | goto patch_site | |
1053 | ||
1054 | switch (type) { | |
5b09b287 | 1055 | #ifdef CONFIG_X86_32 |
93b1eab3 JF |
1056 | SITE(pv_irq_ops, irq_enable); |
1057 | SITE(pv_irq_ops, irq_disable); | |
1058 | SITE(pv_irq_ops, save_fl); | |
1059 | SITE(pv_irq_ops, restore_fl); | |
5b09b287 | 1060 | #endif /* CONFIG_X86_32 */ |
6487673b JF |
1061 | #undef SITE |
1062 | ||
1063 | patch_site: | |
1064 | if (start == NULL || (end-start) > len) | |
1065 | goto default_patch; | |
1066 | ||
ab144f5e | 1067 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
6487673b JF |
1068 | |
1069 | /* Note: because reloc is assigned from something that | |
1070 | appears to be an array, gcc assumes it's non-null, | |
1071 | but doesn't know its relationship with start and | |
1072 | end. */ | |
1073 | if (reloc > start && reloc < end) { | |
1074 | int reloc_off = reloc - start; | |
ab144f5e AK |
1075 | long *relocp = (long *)(insnbuf + reloc_off); |
1076 | long delta = start - (char *)addr; | |
6487673b JF |
1077 | |
1078 | *relocp += delta; | |
1079 | } | |
1080 | break; | |
1081 | ||
1082 | default_patch: | |
1083 | default: | |
ab144f5e AK |
1084 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
1085 | addr, len); | |
6487673b JF |
1086 | break; |
1087 | } | |
1088 | ||
1089 | return ret; | |
1090 | } | |
1091 | ||
aeaaa59c JF |
1092 | static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot) |
1093 | { | |
1094 | pte_t pte; | |
1095 | ||
1096 | phys >>= PAGE_SHIFT; | |
1097 | ||
1098 | switch (idx) { | |
1099 | case FIX_BTMAP_END ... FIX_BTMAP_BEGIN: | |
1100 | #ifdef CONFIG_X86_F00F_BUG | |
1101 | case FIX_F00F_IDT: | |
1102 | #endif | |
15664f96 | 1103 | #ifdef CONFIG_X86_32 |
aeaaa59c JF |
1104 | case FIX_WP_TEST: |
1105 | case FIX_VDSO: | |
b3fe1243 | 1106 | # ifdef CONFIG_HIGHMEM |
15664f96 | 1107 | case FIX_KMAP_BEGIN ... FIX_KMAP_END: |
b3fe1243 | 1108 | # endif |
15664f96 JF |
1109 | #else |
1110 | case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE: | |
1111 | #endif | |
aeaaa59c JF |
1112 | #ifdef CONFIG_X86_LOCAL_APIC |
1113 | case FIX_APIC_BASE: /* maps dummy local APIC */ | |
1114 | #endif | |
1115 | pte = pfn_pte(phys, prot); | |
1116 | break; | |
1117 | ||
1118 | default: | |
1119 | pte = mfn_pte(phys, prot); | |
1120 | break; | |
1121 | } | |
1122 | ||
1123 | __native_set_fixmap(idx, pte); | |
bf18bf94 JF |
1124 | |
1125 | #ifdef CONFIG_X86_64 | |
1126 | /* Replicate changes to map the vsyscall page into the user | |
1127 | pagetable vsyscall mapping. */ | |
1128 | if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) { | |
1129 | unsigned long vaddr = __fix_to_virt(idx); | |
1130 | set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte); | |
1131 | } | |
1132 | #endif | |
aeaaa59c JF |
1133 | } |
1134 | ||
93b1eab3 | 1135 | static const struct pv_info xen_info __initdata = { |
5ead97c8 JF |
1136 | .paravirt_enabled = 1, |
1137 | .shared_kernel_pmd = 0, | |
1138 | ||
1139 | .name = "Xen", | |
93b1eab3 | 1140 | }; |
5ead97c8 | 1141 | |
93b1eab3 | 1142 | static const struct pv_init_ops xen_init_ops __initdata = { |
6487673b | 1143 | .patch = xen_patch, |
5ead97c8 | 1144 | |
93b1eab3 | 1145 | .banner = xen_banner, |
5ead97c8 JF |
1146 | .memory_setup = xen_memory_setup, |
1147 | .arch_setup = xen_arch_setup, | |
e2426cf8 | 1148 | .post_allocator_init = xen_post_allocator_init, |
93b1eab3 | 1149 | }; |
5ead97c8 | 1150 | |
93b1eab3 | 1151 | static const struct pv_time_ops xen_time_ops __initdata = { |
15c84731 | 1152 | .time_init = xen_time_init, |
93b1eab3 | 1153 | |
15c84731 JF |
1154 | .set_wallclock = xen_set_wallclock, |
1155 | .get_wallclock = xen_get_wallclock, | |
e93ef949 | 1156 | .get_tsc_khz = xen_tsc_khz, |
ab550288 | 1157 | .sched_clock = xen_sched_clock, |
93b1eab3 | 1158 | }; |
15c84731 | 1159 | |
93b1eab3 | 1160 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
5ead97c8 JF |
1161 | .cpuid = xen_cpuid, |
1162 | ||
1163 | .set_debugreg = xen_set_debugreg, | |
1164 | .get_debugreg = xen_get_debugreg, | |
1165 | ||
7b1333aa | 1166 | .clts = xen_clts, |
5ead97c8 JF |
1167 | |
1168 | .read_cr0 = native_read_cr0, | |
7b1333aa | 1169 | .write_cr0 = xen_write_cr0, |
5ead97c8 | 1170 | |
5ead97c8 JF |
1171 | .read_cr4 = native_read_cr4, |
1172 | .read_cr4_safe = native_read_cr4_safe, | |
1173 | .write_cr4 = xen_write_cr4, | |
1174 | ||
5ead97c8 JF |
1175 | .wbinvd = native_wbinvd, |
1176 | ||
1177 | .read_msr = native_read_msr_safe, | |
1153968a | 1178 | .write_msr = xen_write_msr_safe, |
5ead97c8 JF |
1179 | .read_tsc = native_read_tsc, |
1180 | .read_pmc = native_read_pmc, | |
1181 | ||
81e103f1 | 1182 | .iret = xen_iret, |
d75cd22f | 1183 | .irq_enable_sysexit = xen_sysexit, |
6fcac6d3 JF |
1184 | #ifdef CONFIG_X86_64 |
1185 | .usergs_sysret32 = xen_sysret32, | |
1186 | .usergs_sysret64 = xen_sysret64, | |
1187 | #endif | |
5ead97c8 JF |
1188 | |
1189 | .load_tr_desc = paravirt_nop, | |
1190 | .set_ldt = xen_set_ldt, | |
1191 | .load_gdt = xen_load_gdt, | |
1192 | .load_idt = xen_load_idt, | |
1193 | .load_tls = xen_load_tls, | |
a8fc1089 EH |
1194 | #ifdef CONFIG_X86_64 |
1195 | .load_gs_index = xen_load_gs_index, | |
1196 | #endif | |
5ead97c8 | 1197 | |
38ffbe66 JF |
1198 | .alloc_ldt = xen_alloc_ldt, |
1199 | .free_ldt = xen_free_ldt, | |
1200 | ||
5ead97c8 JF |
1201 | .store_gdt = native_store_gdt, |
1202 | .store_idt = native_store_idt, | |
1203 | .store_tr = xen_store_tr, | |
1204 | ||
1205 | .write_ldt_entry = xen_write_ldt_entry, | |
1206 | .write_gdt_entry = xen_write_gdt_entry, | |
1207 | .write_idt_entry = xen_write_idt_entry, | |
faca6227 | 1208 | .load_sp0 = xen_load_sp0, |
5ead97c8 JF |
1209 | |
1210 | .set_iopl_mask = xen_set_iopl_mask, | |
1211 | .io_delay = xen_io_delay, | |
1212 | ||
952d1d70 JF |
1213 | /* Xen takes care of %gs when switching to usermode for us */ |
1214 | .swapgs = paravirt_nop, | |
1215 | ||
8965c1c0 JF |
1216 | .lazy_mode = { |
1217 | .enter = paravirt_enter_lazy_cpu, | |
1218 | .leave = xen_leave_lazy, | |
1219 | }, | |
93b1eab3 JF |
1220 | }; |
1221 | ||
93b1eab3 | 1222 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
5ead97c8 | 1223 | #ifdef CONFIG_X86_LOCAL_APIC |
f87e4cac | 1224 | .apic_write = xen_apic_write, |
5ead97c8 JF |
1225 | .apic_read = xen_apic_read, |
1226 | .setup_boot_clock = paravirt_nop, | |
1227 | .setup_secondary_clock = paravirt_nop, | |
1228 | .startup_ipi_hook = paravirt_nop, | |
1229 | #endif | |
93b1eab3 JF |
1230 | }; |
1231 | ||
1232 | static const struct pv_mmu_ops xen_mmu_ops __initdata = { | |
1233 | .pagetable_setup_start = xen_pagetable_setup_start, | |
1234 | .pagetable_setup_done = xen_pagetable_setup_done, | |
1235 | ||
1236 | .read_cr2 = xen_read_cr2, | |
1237 | .write_cr2 = xen_write_cr2, | |
1238 | ||
1239 | .read_cr3 = xen_read_cr3, | |
1240 | .write_cr3 = xen_write_cr3, | |
5ead97c8 JF |
1241 | |
1242 | .flush_tlb_user = xen_flush_tlb, | |
1243 | .flush_tlb_kernel = xen_flush_tlb, | |
1244 | .flush_tlb_single = xen_flush_tlb_single, | |
f87e4cac | 1245 | .flush_tlb_others = xen_flush_tlb_others, |
5ead97c8 JF |
1246 | |
1247 | .pte_update = paravirt_nop, | |
1248 | .pte_update_defer = paravirt_nop, | |
1249 | ||
d6182fbf JF |
1250 | .pgd_alloc = xen_pgd_alloc, |
1251 | .pgd_free = xen_pgd_free, | |
eba0045f | 1252 | |
6944a9c8 JF |
1253 | .alloc_pte = xen_alloc_pte_init, |
1254 | .release_pte = xen_release_pte_init, | |
1255 | .alloc_pmd = xen_alloc_pte_init, | |
1256 | .alloc_pmd_clone = paravirt_nop, | |
1257 | .release_pmd = xen_release_pte_init, | |
f4f97b3e JF |
1258 | |
1259 | #ifdef CONFIG_HIGHPTE | |
1260 | .kmap_atomic_pte = xen_kmap_atomic_pte, | |
1261 | #endif | |
5ead97c8 | 1262 | |
22911b3f JF |
1263 | #ifdef CONFIG_X86_64 |
1264 | .set_pte = xen_set_pte, | |
1265 | #else | |
851fa3c4 | 1266 | .set_pte = xen_set_pte_init, |
22911b3f | 1267 | #endif |
3b827c1b | 1268 | .set_pte_at = xen_set_pte_at, |
e2426cf8 | 1269 | .set_pmd = xen_set_pmd_hyper, |
3b827c1b | 1270 | |
08b882c6 JF |
1271 | .ptep_modify_prot_start = __ptep_modify_prot_start, |
1272 | .ptep_modify_prot_commit = __ptep_modify_prot_commit, | |
1273 | ||
3b827c1b | 1274 | .pte_val = xen_pte_val, |
b56afe1d | 1275 | .pte_flags = native_pte_flags, |
3b827c1b JF |
1276 | .pgd_val = xen_pgd_val, |
1277 | ||
1278 | .make_pte = xen_make_pte, | |
1279 | .make_pgd = xen_make_pgd, | |
1280 | ||
f6e58732 | 1281 | #ifdef CONFIG_X86_PAE |
3b827c1b JF |
1282 | .set_pte_atomic = xen_set_pte_atomic, |
1283 | .set_pte_present = xen_set_pte_at, | |
3b827c1b JF |
1284 | .pte_clear = xen_pte_clear, |
1285 | .pmd_clear = xen_pmd_clear, | |
f6e58732 JF |
1286 | #endif /* CONFIG_X86_PAE */ |
1287 | .set_pud = xen_set_pud_hyper, | |
3b827c1b JF |
1288 | |
1289 | .make_pmd = xen_make_pmd, | |
1290 | .pmd_val = xen_pmd_val, | |
3b827c1b | 1291 | |
f6e58732 JF |
1292 | #if PAGETABLE_LEVELS == 4 |
1293 | .pud_val = xen_pud_val, | |
1294 | .make_pud = xen_make_pud, | |
1295 | .set_pgd = xen_set_pgd_hyper, | |
1296 | ||
1297 | .alloc_pud = xen_alloc_pte_init, | |
1298 | .release_pud = xen_release_pte_init, | |
1299 | #endif /* PAGETABLE_LEVELS == 4 */ | |
1300 | ||
3b827c1b JF |
1301 | .activate_mm = xen_activate_mm, |
1302 | .dup_mmap = xen_dup_mmap, | |
1303 | .exit_mmap = xen_exit_mmap, | |
1304 | ||
8965c1c0 JF |
1305 | .lazy_mode = { |
1306 | .enter = paravirt_enter_lazy_mmu, | |
1307 | .leave = xen_leave_lazy, | |
1308 | }, | |
aeaaa59c JF |
1309 | |
1310 | .set_fixmap = xen_set_fixmap, | |
5ead97c8 JF |
1311 | }; |
1312 | ||
fefa629a JF |
1313 | static void xen_reboot(int reason) |
1314 | { | |
349c709f JF |
1315 | struct sched_shutdown r = { .reason = reason }; |
1316 | ||
fefa629a JF |
1317 | #ifdef CONFIG_SMP |
1318 | smp_send_stop(); | |
1319 | #endif | |
1320 | ||
349c709f | 1321 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) |
fefa629a JF |
1322 | BUG(); |
1323 | } | |
1324 | ||
1325 | static void xen_restart(char *msg) | |
1326 | { | |
1327 | xen_reboot(SHUTDOWN_reboot); | |
1328 | } | |
1329 | ||
1330 | static void xen_emergency_restart(void) | |
1331 | { | |
1332 | xen_reboot(SHUTDOWN_reboot); | |
1333 | } | |
1334 | ||
1335 | static void xen_machine_halt(void) | |
1336 | { | |
1337 | xen_reboot(SHUTDOWN_poweroff); | |
1338 | } | |
1339 | ||
1340 | static void xen_crash_shutdown(struct pt_regs *regs) | |
1341 | { | |
1342 | xen_reboot(SHUTDOWN_crash); | |
1343 | } | |
1344 | ||
1345 | static const struct machine_ops __initdata xen_machine_ops = { | |
1346 | .restart = xen_restart, | |
1347 | .halt = xen_machine_halt, | |
1348 | .power_off = xen_machine_halt, | |
1349 | .shutdown = xen_machine_halt, | |
1350 | .crash_shutdown = xen_crash_shutdown, | |
1351 | .emergency_restart = xen_emergency_restart, | |
1352 | }; | |
1353 | ||
6487673b | 1354 | |
fb1d8404 JF |
1355 | static void __init xen_reserve_top(void) |
1356 | { | |
f5d36de0 | 1357 | #ifdef CONFIG_X86_32 |
fb1d8404 JF |
1358 | unsigned long top = HYPERVISOR_VIRT_START; |
1359 | struct xen_platform_parameters pp; | |
1360 | ||
1361 | if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) | |
1362 | top = pp.virt_start; | |
1363 | ||
1364 | reserve_top_address(-top + 2 * PAGE_SIZE); | |
f5d36de0 | 1365 | #endif /* CONFIG_X86_32 */ |
fb1d8404 JF |
1366 | } |
1367 | ||
084a2a4e JF |
1368 | /* |
1369 | * Like __va(), but returns address in the kernel mapping (which is | |
1370 | * all we have until the physical memory mapping has been set up. | |
1371 | */ | |
1372 | static void *__ka(phys_addr_t paddr) | |
1373 | { | |
39dbc5bd | 1374 | #ifdef CONFIG_X86_64 |
084a2a4e | 1375 | return (void *)(paddr + __START_KERNEL_map); |
39dbc5bd JF |
1376 | #else |
1377 | return __va(paddr); | |
1378 | #endif | |
fb1d8404 JF |
1379 | } |
1380 | ||
084a2a4e JF |
1381 | /* Convert a machine address to physical address */ |
1382 | static unsigned long m2p(phys_addr_t maddr) | |
1383 | { | |
1384 | phys_addr_t paddr; | |
1385 | ||
59438c9f | 1386 | maddr &= PTE_PFN_MASK; |
084a2a4e JF |
1387 | paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT; |
1388 | ||
1389 | return paddr; | |
fb1d8404 JF |
1390 | } |
1391 | ||
084a2a4e JF |
1392 | /* Convert a machine address to kernel virtual */ |
1393 | static void *m2v(phys_addr_t maddr) | |
1394 | { | |
1395 | return __ka(m2p(maddr)); | |
1396 | } | |
1397 | ||
39dbc5bd | 1398 | #ifdef CONFIG_X86_64 |
084a2a4e JF |
1399 | static void walk(pgd_t *pgd, unsigned long addr) |
1400 | { | |
1401 | unsigned l4idx = pgd_index(addr); | |
1402 | unsigned l3idx = pud_index(addr); | |
1403 | unsigned l2idx = pmd_index(addr); | |
1404 | unsigned l1idx = pte_index(addr); | |
1405 | pgd_t l4; | |
1406 | pud_t l3; | |
1407 | pmd_t l2; | |
1408 | pte_t l1; | |
1409 | ||
1410 | xen_raw_printk("walk %p, %lx -> %d %d %d %d\n", | |
1411 | pgd, addr, l4idx, l3idx, l2idx, l1idx); | |
1412 | ||
1413 | l4 = pgd[l4idx]; | |
1414 | xen_raw_printk(" l4: %016lx\n", l4.pgd); | |
1415 | xen_raw_printk(" %016lx\n", pgd_val(l4)); | |
1416 | ||
1417 | l3 = ((pud_t *)(m2v(l4.pgd)))[l3idx]; | |
1418 | xen_raw_printk(" l3: %016lx\n", l3.pud); | |
1419 | xen_raw_printk(" %016lx\n", pud_val(l3)); | |
1420 | ||
1421 | l2 = ((pmd_t *)(m2v(l3.pud)))[l2idx]; | |
1422 | xen_raw_printk(" l2: %016lx\n", l2.pmd); | |
1423 | xen_raw_printk(" %016lx\n", pmd_val(l2)); | |
1424 | ||
1425 | l1 = ((pte_t *)(m2v(l2.pmd)))[l1idx]; | |
1426 | xen_raw_printk(" l1: %016lx\n", l1.pte); | |
1427 | xen_raw_printk(" %016lx\n", pte_val(l1)); | |
1428 | } | |
39dbc5bd | 1429 | #endif |
084a2a4e JF |
1430 | |
1431 | static void set_page_prot(void *addr, pgprot_t prot) | |
1432 | { | |
1433 | unsigned long pfn = __pa(addr) >> PAGE_SHIFT; | |
1434 | pte_t pte = pfn_pte(pfn, prot); | |
1435 | ||
39dbc5bd | 1436 | xen_raw_printk("addr=%p pfn=%lx mfn=%lx prot=%016llx pte=%016llx\n", |
084a2a4e JF |
1437 | addr, pfn, get_phys_to_machine(pfn), |
1438 | pgprot_val(prot), pte.pte); | |
1439 | ||
1440 | if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0)) | |
1441 | BUG(); | |
1442 | } | |
1443 | ||
39dbc5bd | 1444 | static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn) |
d114e198 JF |
1445 | { |
1446 | unsigned pmdidx, pteidx; | |
1447 | unsigned ident_pte; | |
1448 | unsigned long pfn; | |
1449 | ||
1450 | ident_pte = 0; | |
1451 | pfn = 0; | |
1452 | for(pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) { | |
1453 | pte_t *pte_page; | |
1454 | ||
d114e198 | 1455 | /* Reuse or allocate a page of ptes */ |
39dbc5bd JF |
1456 | if (pmd_present(pmd[pmdidx])) |
1457 | pte_page = m2v(pmd[pmdidx].pmd); | |
d114e198 JF |
1458 | else { |
1459 | /* Check for free pte pages */ | |
1460 | if (ident_pte == ARRAY_SIZE(level1_ident_pgt)) | |
1461 | break; | |
1462 | ||
1463 | pte_page = &level1_ident_pgt[ident_pte]; | |
1464 | ident_pte += PTRS_PER_PTE; | |
1465 | ||
39dbc5bd | 1466 | pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE); |
d114e198 JF |
1467 | } |
1468 | ||
1469 | /* Install mappings */ | |
1470 | for(pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) { | |
1471 | pte_t pte; | |
1472 | ||
1473 | if (pfn > max_pfn_mapped) | |
1474 | max_pfn_mapped = pfn; | |
1475 | ||
1476 | if (!pte_none(pte_page[pteidx])) | |
1477 | continue; | |
1478 | ||
1479 | pte = pfn_pte(pfn, PAGE_KERNEL_EXEC); | |
1480 | pte_page[pteidx] = pte; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | for(pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE) | |
1485 | set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO); | |
39dbc5bd JF |
1486 | |
1487 | set_page_prot(pmd, PAGE_KERNEL_RO); | |
1488 | } | |
1489 | ||
1490 | #ifdef CONFIG_X86_64 | |
1491 | static void convert_pfn_mfn(void *v) | |
1492 | { | |
1493 | pte_t *pte = v; | |
1494 | int i; | |
1495 | ||
1496 | /* All levels are converted the same way, so just treat them | |
1497 | as ptes. */ | |
1498 | for(i = 0; i < PTRS_PER_PTE; i++) | |
1499 | pte[i] = xen_make_pte(pte[i].pte); | |
d114e198 JF |
1500 | } |
1501 | ||
084a2a4e JF |
1502 | /* |
1503 | * Set up the inital kernel pagetable. | |
1504 | * | |
1505 | * We can construct this by grafting the Xen provided pagetable into | |
1506 | * head_64.S's preconstructed pagetables. We copy the Xen L2's into | |
1507 | * level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This | |
1508 | * means that only the kernel has a physical mapping to start with - | |
1509 | * but that's enough to get __va working. We need to fill in the rest | |
1510 | * of the physical mapping once some sort of allocator has been set | |
1511 | * up. | |
1512 | */ | |
d114e198 | 1513 | static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn) |
084a2a4e JF |
1514 | { |
1515 | pud_t *l3; | |
1516 | pmd_t *l2; | |
1517 | ||
1518 | /* Zap identity mapping */ | |
1519 | init_level4_pgt[0] = __pgd(0); | |
1520 | ||
1521 | /* Pre-constructed entries are in pfn, so convert to mfn */ | |
1522 | convert_pfn_mfn(init_level4_pgt); | |
1523 | convert_pfn_mfn(level3_ident_pgt); | |
1524 | convert_pfn_mfn(level3_kernel_pgt); | |
1525 | ||
1526 | l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd); | |
1527 | l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud); | |
1528 | ||
1529 | memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD); | |
1530 | memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD); | |
1531 | ||
1532 | l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd); | |
1533 | l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud); | |
1534 | memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD); | |
1535 | ||
d114e198 | 1536 | /* Set up identity map */ |
39dbc5bd | 1537 | xen_map_identity_early(level2_ident_pgt, max_pfn); |
d114e198 | 1538 | |
084a2a4e JF |
1539 | /* Make pagetable pieces RO */ |
1540 | set_page_prot(init_level4_pgt, PAGE_KERNEL_RO); | |
1541 | set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO); | |
1542 | set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO); | |
bf18bf94 | 1543 | set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO); |
084a2a4e JF |
1544 | set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO); |
1545 | set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO); | |
1546 | ||
1547 | /* Pin down new L4 */ | |
39dbc5bd JF |
1548 | pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE, |
1549 | PFN_DOWN(__pa_symbol(init_level4_pgt))); | |
084a2a4e JF |
1550 | |
1551 | /* Unpin Xen-provided one */ | |
1552 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd))); | |
1553 | ||
1554 | /* Switch over */ | |
1555 | pgd = init_level4_pgt; | |
d6182fbf JF |
1556 | |
1557 | /* | |
1558 | * At this stage there can be no user pgd, and no page | |
1559 | * structure to attach it to, so make sure we just set kernel | |
1560 | * pgd. | |
1561 | */ | |
1562 | xen_mc_batch(); | |
1563 | __xen_write_cr3(true, __pa(pgd)); | |
1564 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
084a2a4e | 1565 | |
d114e198 JF |
1566 | reserve_early(__pa(xen_start_info->pt_base), |
1567 | __pa(xen_start_info->pt_base + | |
1568 | xen_start_info->nr_pt_frames * PAGE_SIZE), | |
1569 | "XEN PAGETABLES"); | |
084a2a4e JF |
1570 | |
1571 | return pgd; | |
1572 | } | |
39dbc5bd JF |
1573 | #else /* !CONFIG_X86_64 */ |
1574 | static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss; | |
1575 | ||
d114e198 | 1576 | static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn) |
084a2a4e | 1577 | { |
39dbc5bd JF |
1578 | pmd_t *kernel_pmd; |
1579 | ||
084a2a4e JF |
1580 | init_pg_tables_start = __pa(pgd); |
1581 | init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE; | |
1582 | max_pfn_mapped = PFN_DOWN(init_pg_tables_end + 512*1024); | |
1583 | ||
39dbc5bd JF |
1584 | kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd); |
1585 | memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD); | |
d114e198 | 1586 | |
39dbc5bd JF |
1587 | xen_map_identity_early(level2_kernel_pgt, max_pfn); |
1588 | ||
1589 | memcpy(swapper_pg_dir, pgd, sizeof(pgd_t) * PTRS_PER_PGD); | |
1590 | set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY], | |
1591 | __pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT)); | |
1592 | ||
1593 | set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO); | |
1594 | set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO); | |
1595 | set_page_prot(empty_zero_page, PAGE_KERNEL_RO); | |
1596 | ||
1597 | pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd))); | |
1598 | ||
1599 | xen_write_cr3(__pa(swapper_pg_dir)); | |
1600 | ||
1601 | pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir))); | |
1602 | ||
1603 | return swapper_pg_dir; | |
fb1d8404 | 1604 | } |
084a2a4e | 1605 | #endif /* CONFIG_X86_64 */ |
fb1d8404 | 1606 | |
5ead97c8 JF |
1607 | /* First C function to be called on Xen boot */ |
1608 | asmlinkage void __init xen_start_kernel(void) | |
1609 | { | |
1610 | pgd_t *pgd; | |
1611 | ||
1612 | if (!xen_start_info) | |
1613 | return; | |
1614 | ||
7999f4b4 | 1615 | BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); |
5ead97c8 | 1616 | |
e57778a1 JF |
1617 | xen_setup_features(); |
1618 | ||
5ead97c8 | 1619 | /* Install Xen paravirt ops */ |
93b1eab3 JF |
1620 | pv_info = xen_info; |
1621 | pv_init_ops = xen_init_ops; | |
1622 | pv_time_ops = xen_time_ops; | |
1623 | pv_cpu_ops = xen_cpu_ops; | |
93b1eab3 JF |
1624 | pv_apic_ops = xen_apic_ops; |
1625 | pv_mmu_ops = xen_mmu_ops; | |
93b1eab3 | 1626 | |
0d1edf46 JF |
1627 | xen_init_irq_ops(); |
1628 | ||
e57778a1 JF |
1629 | if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) { |
1630 | pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start; | |
1631 | pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit; | |
1632 | } | |
1633 | ||
fefa629a JF |
1634 | machine_ops = xen_machine_ops; |
1635 | ||
f5d36de0 JF |
1636 | #ifdef CONFIG_X86_64 |
1637 | /* Disable until direct per-cpu data access. */ | |
1638 | have_vcpu_info_placement = 0; | |
5b09b287 | 1639 | x86_64_init_pda(); |
f87e4cac | 1640 | #endif |
5ead97c8 | 1641 | |
a9e7062d | 1642 | xen_smp_init(); |
5ead97c8 JF |
1643 | |
1644 | /* Get mfn list */ | |
1645 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
d451bb7a | 1646 | xen_build_dynamic_phys_to_machine(); |
5ead97c8 JF |
1647 | |
1648 | pgd = (pgd_t *)xen_start_info->pt_base; | |
1649 | ||
084a2a4e JF |
1650 | /* Prevent unwanted bits from being set in PTEs. */ |
1651 | __supported_pte_mask &= ~_PAGE_GLOBAL; | |
1652 | if (!is_initial_xendomain()) | |
1653 | __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); | |
60223a32 | 1654 | |
60223a32 | 1655 | /* Don't do the full vcpu_info placement stuff until we have a |
2e8fe719 | 1656 | possible map and a non-dummy shared_info. */ |
60223a32 | 1657 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
5ead97c8 | 1658 | |
084a2a4e | 1659 | xen_raw_console_write("mapping kernel into physical memory\n"); |
d114e198 | 1660 | pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages); |
5ead97c8 | 1661 | |
084a2a4e | 1662 | init_mm.pgd = pgd; |
5ead97c8 JF |
1663 | |
1664 | /* keep using Xen gdt for now; no urgent need to change it */ | |
1665 | ||
93b1eab3 | 1666 | pv_info.kernel_rpl = 1; |
5ead97c8 | 1667 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
93b1eab3 | 1668 | pv_info.kernel_rpl = 0; |
5ead97c8 JF |
1669 | |
1670 | /* set the limit of our address space */ | |
fb1d8404 | 1671 | xen_reserve_top(); |
5ead97c8 | 1672 | |
7d087b68 | 1673 | #ifdef CONFIG_X86_32 |
5ead97c8 JF |
1674 | /* set up basic CPUID stuff */ |
1675 | cpu_detect(&new_cpu_data); | |
1676 | new_cpu_data.hard_math = 1; | |
1677 | new_cpu_data.x86_capability[0] = cpuid_edx(1); | |
7d087b68 | 1678 | #endif |
5ead97c8 JF |
1679 | |
1680 | /* Poke various useful things into boot_params */ | |
30c82645 PA |
1681 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
1682 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start | |
1683 | ? __pa(xen_start_info->mod_start) : 0; | |
1684 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; | |
b7c3c5c1 | 1685 | boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); |
5ead97c8 | 1686 | |
9e124fe1 | 1687 | if (!is_initial_xendomain()) { |
83abc70a | 1688 | add_preferred_console("xenboot", 0, NULL); |
9e124fe1 | 1689 | add_preferred_console("tty", 0, NULL); |
b8c2d3df | 1690 | add_preferred_console("hvc", 0, NULL); |
9e124fe1 | 1691 | } |
b8c2d3df | 1692 | |
084a2a4e JF |
1693 | xen_raw_console_write("about to get started...\n"); |
1694 | ||
1695 | #if 0 | |
1696 | xen_raw_printk("&boot_params=%p __pa(&boot_params)=%lx __va(__pa(&boot_params))=%lx\n", | |
1697 | &boot_params, __pa_symbol(&boot_params), | |
1698 | __va(__pa_symbol(&boot_params))); | |
1699 | ||
1700 | walk(pgd, &boot_params); | |
1701 | walk(pgd, __va(__pa(&boot_params))); | |
1702 | #endif | |
b8c2d3df | 1703 | |
5ead97c8 | 1704 | /* Start the world */ |
f5d36de0 | 1705 | #ifdef CONFIG_X86_32 |
f0d43100 | 1706 | i386_start_kernel(); |
f5d36de0 | 1707 | #else |
084a2a4e | 1708 | x86_64_start_reservations((char *)__pa_symbol(&boot_params)); |
f5d36de0 | 1709 | #endif |
5ead97c8 | 1710 | } |