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> | |
ecbf29cd | 31 | #include <xen/interface/version.h> |
5ead97c8 JF |
32 | #include <xen/interface/physdev.h> |
33 | #include <xen/interface/vcpu.h> | |
34 | #include <xen/features.h> | |
35 | #include <xen/page.h> | |
084a2a4e | 36 | #include <xen/hvc-console.h> |
5ead97c8 JF |
37 | |
38 | #include <asm/paravirt.h> | |
7b6aa335 | 39 | #include <asm/apic.h> |
5ead97c8 JF |
40 | #include <asm/page.h> |
41 | #include <asm/xen/hypercall.h> | |
42 | #include <asm/xen/hypervisor.h> | |
43 | #include <asm/fixmap.h> | |
44 | #include <asm/processor.h> | |
707ebbc8 | 45 | #include <asm/proto.h> |
1153968a | 46 | #include <asm/msr-index.h> |
5ead97c8 JF |
47 | #include <asm/setup.h> |
48 | #include <asm/desc.h> | |
49 | #include <asm/pgtable.h> | |
f87e4cac | 50 | #include <asm/tlbflush.h> |
fefa629a | 51 | #include <asm/reboot.h> |
5ead97c8 JF |
52 | |
53 | #include "xen-ops.h" | |
3b827c1b | 54 | #include "mmu.h" |
5ead97c8 JF |
55 | #include "multicalls.h" |
56 | ||
57 | EXPORT_SYMBOL_GPL(hypercall_page); | |
58 | ||
5ead97c8 JF |
59 | DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); |
60 | DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); | |
9f79991d | 61 | |
6e833587 JF |
62 | enum xen_domain_type xen_domain_type = XEN_NATIVE; |
63 | EXPORT_SYMBOL_GPL(xen_domain_type); | |
64 | ||
5ead97c8 JF |
65 | struct start_info *xen_start_info; |
66 | EXPORT_SYMBOL_GPL(xen_start_info); | |
67 | ||
a0d695c8 | 68 | struct shared_info xen_dummy_shared_info; |
60223a32 | 69 | |
38341432 JF |
70 | void *xen_initial_gdt; |
71 | ||
60223a32 JF |
72 | /* |
73 | * Point at some empty memory to start with. We map the real shared_info | |
74 | * page as soon as fixmap is up and running. | |
75 | */ | |
a0d695c8 | 76 | struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info; |
60223a32 JF |
77 | |
78 | /* | |
79 | * Flag to determine whether vcpu info placement is available on all | |
80 | * VCPUs. We assume it is to start with, and then set it to zero on | |
81 | * the first failure. This is because it can succeed on some VCPUs | |
82 | * and not others, since it can involve hypervisor memory allocation, | |
83 | * or because the guest failed to guarantee all the appropriate | |
84 | * constraints on all VCPUs (ie buffer can't cross a page boundary). | |
85 | * | |
86 | * Note that any particular CPU may be using a placed vcpu structure, | |
87 | * but we can only optimise if the all are. | |
88 | * | |
89 | * 0: not available, 1: available | |
90 | */ | |
e4d04071 | 91 | static int have_vcpu_info_placement = 1; |
60223a32 | 92 | |
9c7a7942 | 93 | static void xen_vcpu_setup(int cpu) |
5ead97c8 | 94 | { |
60223a32 JF |
95 | struct vcpu_register_vcpu_info info; |
96 | int err; | |
97 | struct vcpu_info *vcpup; | |
98 | ||
a0d695c8 | 99 | BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); |
5ead97c8 | 100 | per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; |
60223a32 JF |
101 | |
102 | if (!have_vcpu_info_placement) | |
103 | return; /* already tested, not available */ | |
104 | ||
105 | vcpup = &per_cpu(xen_vcpu_info, cpu); | |
106 | ||
9976b39b | 107 | info.mfn = arbitrary_virt_to_mfn(vcpup); |
60223a32 JF |
108 | info.offset = offset_in_page(vcpup); |
109 | ||
e3d26976 | 110 | printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n", |
60223a32 JF |
111 | cpu, vcpup, info.mfn, info.offset); |
112 | ||
113 | /* Check to see if the hypervisor will put the vcpu_info | |
114 | structure where we want it, which allows direct access via | |
115 | a percpu-variable. */ | |
116 | err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); | |
117 | ||
118 | if (err) { | |
119 | printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); | |
120 | have_vcpu_info_placement = 0; | |
121 | } else { | |
122 | /* This cpu is using the registered vcpu info, even if | |
123 | later ones fail to. */ | |
124 | per_cpu(xen_vcpu, cpu) = vcpup; | |
6487673b | 125 | |
60223a32 JF |
126 | printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n", |
127 | cpu, vcpup); | |
128 | } | |
5ead97c8 JF |
129 | } |
130 | ||
9c7a7942 JF |
131 | /* |
132 | * On restore, set the vcpu placement up again. | |
133 | * If it fails, then we're in a bad state, since | |
134 | * we can't back out from using it... | |
135 | */ | |
136 | void xen_vcpu_restore(void) | |
137 | { | |
138 | if (have_vcpu_info_placement) { | |
139 | int cpu; | |
140 | ||
141 | for_each_online_cpu(cpu) { | |
142 | bool other_cpu = (cpu != smp_processor_id()); | |
143 | ||
144 | if (other_cpu && | |
145 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) | |
146 | BUG(); | |
147 | ||
148 | xen_vcpu_setup(cpu); | |
149 | ||
150 | if (other_cpu && | |
151 | HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) | |
152 | BUG(); | |
153 | } | |
154 | ||
155 | BUG_ON(!have_vcpu_info_placement); | |
156 | } | |
157 | } | |
158 | ||
5ead97c8 JF |
159 | static void __init xen_banner(void) |
160 | { | |
95c7c23b JF |
161 | unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL); |
162 | struct xen_extraversion extra; | |
163 | HYPERVISOR_xen_version(XENVER_extraversion, &extra); | |
164 | ||
5ead97c8 | 165 | printk(KERN_INFO "Booting paravirtualized kernel on %s\n", |
93b1eab3 | 166 | pv_info.name); |
95c7c23b JF |
167 | printk(KERN_INFO "Xen version: %d.%d%s%s\n", |
168 | version >> 16, version & 0xffff, extra.extraversion, | |
e57778a1 | 169 | xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); |
5ead97c8 JF |
170 | } |
171 | ||
e826fe1b JF |
172 | static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; |
173 | static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; | |
174 | ||
65ea5b03 PA |
175 | static void xen_cpuid(unsigned int *ax, unsigned int *bx, |
176 | unsigned int *cx, unsigned int *dx) | |
5ead97c8 | 177 | { |
e826fe1b | 178 | unsigned maskecx = ~0; |
5ead97c8 JF |
179 | unsigned maskedx = ~0; |
180 | ||
181 | /* | |
182 | * Mask out inconvenient features, to try and disable as many | |
183 | * unsupported kernel subsystems as possible. | |
184 | */ | |
e826fe1b JF |
185 | if (*ax == 1) { |
186 | maskecx = cpuid_leaf1_ecx_mask; | |
187 | maskedx = cpuid_leaf1_edx_mask; | |
188 | } | |
5ead97c8 JF |
189 | |
190 | asm(XEN_EMULATE_PREFIX "cpuid" | |
65ea5b03 PA |
191 | : "=a" (*ax), |
192 | "=b" (*bx), | |
193 | "=c" (*cx), | |
194 | "=d" (*dx) | |
195 | : "0" (*ax), "2" (*cx)); | |
e826fe1b JF |
196 | |
197 | *cx &= maskecx; | |
65ea5b03 | 198 | *dx &= maskedx; |
5ead97c8 JF |
199 | } |
200 | ||
e826fe1b JF |
201 | static __init void xen_init_cpuid_mask(void) |
202 | { | |
203 | unsigned int ax, bx, cx, dx; | |
204 | ||
205 | cpuid_leaf1_edx_mask = | |
206 | ~((1 << X86_FEATURE_MCE) | /* disable MCE */ | |
207 | (1 << X86_FEATURE_MCA) | /* disable MCA */ | |
208 | (1 << X86_FEATURE_ACC)); /* thermal monitoring */ | |
209 | ||
210 | if (!xen_initial_domain()) | |
211 | cpuid_leaf1_edx_mask &= | |
212 | ~((1 << X86_FEATURE_APIC) | /* disable local APIC */ | |
213 | (1 << X86_FEATURE_ACPI)); /* disable ACPI */ | |
214 | ||
215 | ax = 1; | |
216 | xen_cpuid(&ax, &bx, &cx, &dx); | |
217 | ||
218 | /* cpuid claims we support xsave; try enabling it to see what happens */ | |
219 | if (cx & (1 << (X86_FEATURE_XSAVE % 32))) { | |
220 | unsigned long cr4; | |
221 | ||
222 | set_in_cr4(X86_CR4_OSXSAVE); | |
223 | ||
224 | cr4 = read_cr4(); | |
225 | ||
226 | if ((cr4 & X86_CR4_OSXSAVE) == 0) | |
227 | cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_XSAVE % 32)); | |
228 | ||
229 | clear_in_cr4(X86_CR4_OSXSAVE); | |
230 | } | |
231 | } | |
232 | ||
5ead97c8 JF |
233 | static void xen_set_debugreg(int reg, unsigned long val) |
234 | { | |
235 | HYPERVISOR_set_debugreg(reg, val); | |
236 | } | |
237 | ||
238 | static unsigned long xen_get_debugreg(int reg) | |
239 | { | |
240 | return HYPERVISOR_get_debugreg(reg); | |
241 | } | |
242 | ||
224101ed | 243 | static void xen_end_context_switch(struct task_struct *next) |
5ead97c8 | 244 | { |
5ead97c8 | 245 | xen_mc_flush(); |
224101ed | 246 | paravirt_end_context_switch(next); |
5ead97c8 JF |
247 | } |
248 | ||
249 | static unsigned long xen_store_tr(void) | |
250 | { | |
251 | return 0; | |
252 | } | |
253 | ||
a05d2eba | 254 | /* |
cef43bf6 JF |
255 | * Set the page permissions for a particular virtual address. If the |
256 | * address is a vmalloc mapping (or other non-linear mapping), then | |
257 | * find the linear mapping of the page and also set its protections to | |
258 | * match. | |
a05d2eba JF |
259 | */ |
260 | static void set_aliased_prot(void *v, pgprot_t prot) | |
261 | { | |
262 | int level; | |
263 | pte_t *ptep; | |
264 | pte_t pte; | |
265 | unsigned long pfn; | |
266 | struct page *page; | |
267 | ||
268 | ptep = lookup_address((unsigned long)v, &level); | |
269 | BUG_ON(ptep == NULL); | |
270 | ||
271 | pfn = pte_pfn(*ptep); | |
272 | page = pfn_to_page(pfn); | |
273 | ||
274 | pte = pfn_pte(pfn, prot); | |
275 | ||
276 | if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) | |
277 | BUG(); | |
278 | ||
279 | if (!PageHighMem(page)) { | |
280 | void *av = __va(PFN_PHYS(pfn)); | |
281 | ||
282 | if (av != v) | |
283 | if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0)) | |
284 | BUG(); | |
285 | } else | |
286 | kmap_flush_unused(); | |
287 | } | |
288 | ||
38ffbe66 JF |
289 | static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries) |
290 | { | |
a05d2eba | 291 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
38ffbe66 JF |
292 | int i; |
293 | ||
a05d2eba JF |
294 | for(i = 0; i < entries; i += entries_per_page) |
295 | set_aliased_prot(ldt + i, PAGE_KERNEL_RO); | |
38ffbe66 JF |
296 | } |
297 | ||
298 | static void xen_free_ldt(struct desc_struct *ldt, unsigned entries) | |
299 | { | |
a05d2eba | 300 | const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE; |
38ffbe66 JF |
301 | int i; |
302 | ||
a05d2eba JF |
303 | for(i = 0; i < entries; i += entries_per_page) |
304 | set_aliased_prot(ldt + i, PAGE_KERNEL); | |
38ffbe66 JF |
305 | } |
306 | ||
5ead97c8 JF |
307 | static void xen_set_ldt(const void *addr, unsigned entries) |
308 | { | |
5ead97c8 JF |
309 | struct mmuext_op *op; |
310 | struct multicall_space mcs = xen_mc_entry(sizeof(*op)); | |
311 | ||
312 | op = mcs.args; | |
313 | op->cmd = MMUEXT_SET_LDT; | |
4dbf7af6 | 314 | op->arg1.linear_addr = (unsigned long)addr; |
5ead97c8 JF |
315 | op->arg2.nr_ents = entries; |
316 | ||
317 | MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF); | |
318 | ||
319 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
320 | } | |
321 | ||
6b68f01b | 322 | static void xen_load_gdt(const struct desc_ptr *dtr) |
5ead97c8 | 323 | { |
5ead97c8 JF |
324 | unsigned long va = dtr->address; |
325 | unsigned int size = dtr->size + 1; | |
326 | unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
3ce5fa7e | 327 | unsigned long frames[pages]; |
5ead97c8 | 328 | int f; |
5ead97c8 JF |
329 | |
330 | /* A GDT can be up to 64k in size, which corresponds to 8192 | |
331 | 8-byte entries, or 16 4k pages.. */ | |
332 | ||
333 | BUG_ON(size > 65536); | |
334 | BUG_ON(va & ~PAGE_MASK); | |
335 | ||
5ead97c8 | 336 | for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) { |
6ed6bf42 JF |
337 | int level; |
338 | pte_t *ptep = lookup_address(va, &level); | |
339 | unsigned long pfn, mfn; | |
340 | void *virt; | |
341 | ||
342 | BUG_ON(ptep == NULL); | |
343 | ||
344 | pfn = pte_pfn(*ptep); | |
345 | mfn = pfn_to_mfn(pfn); | |
346 | virt = __va(PFN_PHYS(pfn)); | |
347 | ||
348 | frames[f] = mfn; | |
9976b39b | 349 | |
5ead97c8 | 350 | make_lowmem_page_readonly((void *)va); |
6ed6bf42 | 351 | make_lowmem_page_readonly(virt); |
5ead97c8 JF |
352 | } |
353 | ||
3ce5fa7e JF |
354 | if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct))) |
355 | BUG(); | |
5ead97c8 JF |
356 | } |
357 | ||
358 | static void load_TLS_descriptor(struct thread_struct *t, | |
359 | unsigned int cpu, unsigned int i) | |
360 | { | |
361 | struct desc_struct *gdt = get_cpu_gdt_table(cpu); | |
9976b39b | 362 | xmaddr_t maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]); |
5ead97c8 JF |
363 | struct multicall_space mc = __xen_mc_entry(0); |
364 | ||
365 | MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]); | |
366 | } | |
367 | ||
368 | static void xen_load_tls(struct thread_struct *t, unsigned int cpu) | |
369 | { | |
8b84ad94 | 370 | /* |
ccbeed3a TH |
371 | * XXX sleazy hack: If we're being called in a lazy-cpu zone |
372 | * and lazy gs handling is enabled, it means we're in a | |
373 | * context switch, and %gs has just been saved. This means we | |
374 | * can zero it out to prevent faults on exit from the | |
375 | * hypervisor if the next process has no %gs. Either way, it | |
376 | * has been saved, and the new value will get loaded properly. | |
377 | * This will go away as soon as Xen has been modified to not | |
378 | * save/restore %gs for normal hypercalls. | |
8a95408e EH |
379 | * |
380 | * On x86_64, this hack is not used for %gs, because gs points | |
381 | * to KERNEL_GS_BASE (and uses it for PDA references), so we | |
382 | * must not zero %gs on x86_64 | |
383 | * | |
384 | * For x86_64, we need to zero %fs, otherwise we may get an | |
385 | * exception between the new %fs descriptor being loaded and | |
386 | * %fs being effectively cleared at __switch_to(). | |
8b84ad94 | 387 | */ |
8a95408e EH |
388 | if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) { |
389 | #ifdef CONFIG_X86_32 | |
ccbeed3a | 390 | lazy_load_gs(0); |
8a95408e EH |
391 | #else |
392 | loadsegment(fs, 0); | |
393 | #endif | |
394 | } | |
395 | ||
396 | xen_mc_batch(); | |
397 | ||
398 | load_TLS_descriptor(t, cpu, 0); | |
399 | load_TLS_descriptor(t, cpu, 1); | |
400 | load_TLS_descriptor(t, cpu, 2); | |
401 | ||
402 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
5ead97c8 JF |
403 | } |
404 | ||
a8fc1089 EH |
405 | #ifdef CONFIG_X86_64 |
406 | static void xen_load_gs_index(unsigned int idx) | |
407 | { | |
408 | if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx)) | |
409 | BUG(); | |
5ead97c8 | 410 | } |
a8fc1089 | 411 | #endif |
5ead97c8 JF |
412 | |
413 | static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, | |
75b8bb3e | 414 | const void *ptr) |
5ead97c8 | 415 | { |
cef43bf6 | 416 | xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]); |
75b8bb3e | 417 | u64 entry = *(u64 *)ptr; |
5ead97c8 | 418 | |
f120f13e JF |
419 | preempt_disable(); |
420 | ||
5ead97c8 JF |
421 | xen_mc_flush(); |
422 | if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry)) | |
423 | BUG(); | |
f120f13e JF |
424 | |
425 | preempt_enable(); | |
5ead97c8 JF |
426 | } |
427 | ||
e176d367 | 428 | static int cvt_gate_to_trap(int vector, const gate_desc *val, |
5ead97c8 JF |
429 | struct trap_info *info) |
430 | { | |
6d02c426 | 431 | if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT) |
5ead97c8 JF |
432 | return 0; |
433 | ||
434 | info->vector = vector; | |
e176d367 EH |
435 | info->address = gate_offset(*val); |
436 | info->cs = gate_segment(*val); | |
437 | info->flags = val->dpl; | |
5ead97c8 | 438 | /* interrupt gates clear IF */ |
6d02c426 JF |
439 | if (val->type == GATE_INTERRUPT) |
440 | info->flags |= 1 << 2; | |
5ead97c8 JF |
441 | |
442 | return 1; | |
443 | } | |
444 | ||
445 | /* Locations of each CPU's IDT */ | |
6b68f01b | 446 | static DEFINE_PER_CPU(struct desc_ptr, idt_desc); |
5ead97c8 JF |
447 | |
448 | /* Set an IDT entry. If the entry is part of the current IDT, then | |
449 | also update Xen. */ | |
8d947344 | 450 | static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g) |
5ead97c8 | 451 | { |
5ead97c8 | 452 | unsigned long p = (unsigned long)&dt[entrynum]; |
f120f13e JF |
453 | unsigned long start, end; |
454 | ||
455 | preempt_disable(); | |
456 | ||
457 | start = __get_cpu_var(idt_desc).address; | |
458 | end = start + __get_cpu_var(idt_desc).size + 1; | |
5ead97c8 JF |
459 | |
460 | xen_mc_flush(); | |
461 | ||
8d947344 | 462 | native_write_idt_entry(dt, entrynum, g); |
5ead97c8 JF |
463 | |
464 | if (p >= start && (p + 8) <= end) { | |
465 | struct trap_info info[2]; | |
466 | ||
467 | info[1].address = 0; | |
468 | ||
e176d367 | 469 | if (cvt_gate_to_trap(entrynum, g, &info[0])) |
5ead97c8 JF |
470 | if (HYPERVISOR_set_trap_table(info)) |
471 | BUG(); | |
472 | } | |
f120f13e JF |
473 | |
474 | preempt_enable(); | |
5ead97c8 JF |
475 | } |
476 | ||
6b68f01b | 477 | static void xen_convert_trap_info(const struct desc_ptr *desc, |
f87e4cac | 478 | struct trap_info *traps) |
5ead97c8 | 479 | { |
5ead97c8 JF |
480 | unsigned in, out, count; |
481 | ||
e176d367 | 482 | count = (desc->size+1) / sizeof(gate_desc); |
5ead97c8 JF |
483 | BUG_ON(count > 256); |
484 | ||
5ead97c8 | 485 | for (in = out = 0; in < count; in++) { |
e176d367 | 486 | gate_desc *entry = (gate_desc*)(desc->address) + in; |
5ead97c8 | 487 | |
e176d367 | 488 | if (cvt_gate_to_trap(in, entry, &traps[out])) |
5ead97c8 JF |
489 | out++; |
490 | } | |
491 | traps[out].address = 0; | |
f87e4cac JF |
492 | } |
493 | ||
494 | void xen_copy_trap_info(struct trap_info *traps) | |
495 | { | |
6b68f01b | 496 | const struct desc_ptr *desc = &__get_cpu_var(idt_desc); |
f87e4cac JF |
497 | |
498 | xen_convert_trap_info(desc, traps); | |
f87e4cac JF |
499 | } |
500 | ||
501 | /* Load a new IDT into Xen. In principle this can be per-CPU, so we | |
502 | hold a spinlock to protect the static traps[] array (static because | |
503 | it avoids allocation, and saves stack space). */ | |
6b68f01b | 504 | static void xen_load_idt(const struct desc_ptr *desc) |
f87e4cac JF |
505 | { |
506 | static DEFINE_SPINLOCK(lock); | |
507 | static struct trap_info traps[257]; | |
f87e4cac JF |
508 | |
509 | spin_lock(&lock); | |
510 | ||
f120f13e JF |
511 | __get_cpu_var(idt_desc) = *desc; |
512 | ||
f87e4cac | 513 | xen_convert_trap_info(desc, traps); |
5ead97c8 JF |
514 | |
515 | xen_mc_flush(); | |
516 | if (HYPERVISOR_set_trap_table(traps)) | |
517 | BUG(); | |
518 | ||
519 | spin_unlock(&lock); | |
520 | } | |
521 | ||
522 | /* Write a GDT descriptor entry. Ignore LDT descriptors, since | |
523 | they're handled differently. */ | |
524 | static void xen_write_gdt_entry(struct desc_struct *dt, int entry, | |
014b15be | 525 | const void *desc, int type) |
5ead97c8 | 526 | { |
f120f13e JF |
527 | preempt_disable(); |
528 | ||
014b15be GOC |
529 | switch (type) { |
530 | case DESC_LDT: | |
531 | case DESC_TSS: | |
5ead97c8 JF |
532 | /* ignore */ |
533 | break; | |
534 | ||
535 | default: { | |
9976b39b | 536 | xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]); |
5ead97c8 JF |
537 | |
538 | xen_mc_flush(); | |
014b15be | 539 | if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc)) |
5ead97c8 JF |
540 | BUG(); |
541 | } | |
542 | ||
543 | } | |
f120f13e JF |
544 | |
545 | preempt_enable(); | |
5ead97c8 JF |
546 | } |
547 | ||
faca6227 | 548 | static void xen_load_sp0(struct tss_struct *tss, |
a05d2eba | 549 | struct thread_struct *thread) |
5ead97c8 JF |
550 | { |
551 | struct multicall_space mcs = xen_mc_entry(0); | |
faca6227 | 552 | MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0); |
5ead97c8 JF |
553 | xen_mc_issue(PARAVIRT_LAZY_CPU); |
554 | } | |
555 | ||
556 | static void xen_set_iopl_mask(unsigned mask) | |
557 | { | |
558 | struct physdev_set_iopl set_iopl; | |
559 | ||
560 | /* Force the change at ring 0. */ | |
561 | set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3; | |
562 | HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl); | |
563 | } | |
564 | ||
565 | static void xen_io_delay(void) | |
566 | { | |
567 | } | |
568 | ||
569 | #ifdef CONFIG_X86_LOCAL_APIC | |
ad66dd34 | 570 | static u32 xen_apic_read(u32 reg) |
5ead97c8 JF |
571 | { |
572 | return 0; | |
573 | } | |
f87e4cac | 574 | |
ad66dd34 | 575 | static void xen_apic_write(u32 reg, u32 val) |
f87e4cac JF |
576 | { |
577 | /* Warn to see if there's any stray references */ | |
578 | WARN_ON(1); | |
579 | } | |
ad66dd34 | 580 | |
ad66dd34 SS |
581 | static u64 xen_apic_icr_read(void) |
582 | { | |
583 | return 0; | |
584 | } | |
585 | ||
586 | static void xen_apic_icr_write(u32 low, u32 id) | |
587 | { | |
588 | /* Warn to see if there's any stray references */ | |
589 | WARN_ON(1); | |
590 | } | |
591 | ||
592 | static void xen_apic_wait_icr_idle(void) | |
593 | { | |
594 | return; | |
595 | } | |
596 | ||
94a8c3c2 YL |
597 | static u32 xen_safe_apic_wait_icr_idle(void) |
598 | { | |
599 | return 0; | |
600 | } | |
601 | ||
c1eeb2de YL |
602 | static void set_xen_basic_apic_ops(void) |
603 | { | |
604 | apic->read = xen_apic_read; | |
605 | apic->write = xen_apic_write; | |
606 | apic->icr_read = xen_apic_icr_read; | |
607 | apic->icr_write = xen_apic_icr_write; | |
608 | apic->wait_icr_idle = xen_apic_wait_icr_idle; | |
609 | apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle; | |
610 | } | |
ad66dd34 | 611 | |
5ead97c8 JF |
612 | #endif |
613 | ||
f87e4cac | 614 | |
7b1333aa JF |
615 | static void xen_clts(void) |
616 | { | |
617 | struct multicall_space mcs; | |
618 | ||
619 | mcs = xen_mc_entry(0); | |
620 | ||
621 | MULTI_fpu_taskswitch(mcs.mc, 0); | |
622 | ||
623 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
624 | } | |
625 | ||
626 | static void xen_write_cr0(unsigned long cr0) | |
627 | { | |
628 | struct multicall_space mcs; | |
629 | ||
630 | /* Only pay attention to cr0.TS; everything else is | |
631 | ignored. */ | |
632 | mcs = xen_mc_entry(0); | |
633 | ||
634 | MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0); | |
635 | ||
636 | xen_mc_issue(PARAVIRT_LAZY_CPU); | |
637 | } | |
638 | ||
5ead97c8 JF |
639 | static void xen_write_cr4(unsigned long cr4) |
640 | { | |
2956a351 JF |
641 | cr4 &= ~X86_CR4_PGE; |
642 | cr4 &= ~X86_CR4_PSE; | |
643 | ||
644 | native_write_cr4(cr4); | |
5ead97c8 JF |
645 | } |
646 | ||
1153968a JF |
647 | static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) |
648 | { | |
649 | int ret; | |
650 | ||
651 | ret = 0; | |
652 | ||
f63c2f24 | 653 | switch (msr) { |
1153968a JF |
654 | #ifdef CONFIG_X86_64 |
655 | unsigned which; | |
656 | u64 base; | |
657 | ||
658 | case MSR_FS_BASE: which = SEGBASE_FS; goto set; | |
659 | case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set; | |
660 | case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set; | |
661 | ||
662 | set: | |
663 | base = ((u64)high << 32) | low; | |
664 | if (HYPERVISOR_set_segment_base(which, base) != 0) | |
665 | ret = -EFAULT; | |
666 | break; | |
667 | #endif | |
d89961e2 JF |
668 | |
669 | case MSR_STAR: | |
670 | case MSR_CSTAR: | |
671 | case MSR_LSTAR: | |
672 | case MSR_SYSCALL_MASK: | |
673 | case MSR_IA32_SYSENTER_CS: | |
674 | case MSR_IA32_SYSENTER_ESP: | |
675 | case MSR_IA32_SYSENTER_EIP: | |
676 | /* Fast syscall setup is all done in hypercalls, so | |
677 | these are all ignored. Stub them out here to stop | |
678 | Xen console noise. */ | |
679 | break; | |
680 | ||
1153968a JF |
681 | default: |
682 | ret = native_write_msr_safe(msr, low, high); | |
683 | } | |
684 | ||
685 | return ret; | |
686 | } | |
687 | ||
0e91398f | 688 | void xen_setup_shared_info(void) |
5ead97c8 JF |
689 | { |
690 | if (!xen_feature(XENFEAT_auto_translated_physmap)) { | |
15664f96 JF |
691 | set_fixmap(FIX_PARAVIRT_BOOTMAP, |
692 | xen_start_info->shared_info); | |
693 | ||
694 | HYPERVISOR_shared_info = | |
695 | (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP); | |
5ead97c8 JF |
696 | } else |
697 | HYPERVISOR_shared_info = | |
698 | (struct shared_info *)__va(xen_start_info->shared_info); | |
699 | ||
2e8fe719 JF |
700 | #ifndef CONFIG_SMP |
701 | /* In UP this is as good a place as any to set up shared info */ | |
702 | xen_setup_vcpu_info_placement(); | |
703 | #endif | |
d5edbc1f JF |
704 | |
705 | xen_setup_mfn_list_list(); | |
2e8fe719 JF |
706 | } |
707 | ||
60223a32 | 708 | /* This is called once we have the cpu_possible_map */ |
0e91398f | 709 | void xen_setup_vcpu_info_placement(void) |
60223a32 JF |
710 | { |
711 | int cpu; | |
712 | ||
713 | for_each_possible_cpu(cpu) | |
714 | xen_vcpu_setup(cpu); | |
715 | ||
716 | /* xen_vcpu_setup managed to place the vcpu_info within the | |
717 | percpu area for all cpus, so make use of it */ | |
718 | if (have_vcpu_info_placement) { | |
719 | printk(KERN_INFO "Xen: using vcpu_info placement\n"); | |
720 | ||
ecb93d1c JF |
721 | pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct); |
722 | pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct); | |
723 | pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct); | |
724 | pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct); | |
93b1eab3 | 725 | pv_mmu_ops.read_cr2 = xen_read_cr2_direct; |
60223a32 | 726 | } |
5ead97c8 JF |
727 | } |
728 | ||
ab144f5e AK |
729 | static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, |
730 | unsigned long addr, unsigned len) | |
6487673b JF |
731 | { |
732 | char *start, *end, *reloc; | |
733 | unsigned ret; | |
734 | ||
735 | start = end = reloc = NULL; | |
736 | ||
93b1eab3 JF |
737 | #define SITE(op, x) \ |
738 | case PARAVIRT_PATCH(op.x): \ | |
6487673b JF |
739 | if (have_vcpu_info_placement) { \ |
740 | start = (char *)xen_##x##_direct; \ | |
741 | end = xen_##x##_direct_end; \ | |
742 | reloc = xen_##x##_direct_reloc; \ | |
743 | } \ | |
744 | goto patch_site | |
745 | ||
746 | switch (type) { | |
93b1eab3 JF |
747 | SITE(pv_irq_ops, irq_enable); |
748 | SITE(pv_irq_ops, irq_disable); | |
749 | SITE(pv_irq_ops, save_fl); | |
750 | SITE(pv_irq_ops, restore_fl); | |
6487673b JF |
751 | #undef SITE |
752 | ||
753 | patch_site: | |
754 | if (start == NULL || (end-start) > len) | |
755 | goto default_patch; | |
756 | ||
ab144f5e | 757 | ret = paravirt_patch_insns(insnbuf, len, start, end); |
6487673b JF |
758 | |
759 | /* Note: because reloc is assigned from something that | |
760 | appears to be an array, gcc assumes it's non-null, | |
761 | but doesn't know its relationship with start and | |
762 | end. */ | |
763 | if (reloc > start && reloc < end) { | |
764 | int reloc_off = reloc - start; | |
ab144f5e AK |
765 | long *relocp = (long *)(insnbuf + reloc_off); |
766 | long delta = start - (char *)addr; | |
6487673b JF |
767 | |
768 | *relocp += delta; | |
769 | } | |
770 | break; | |
771 | ||
772 | default_patch: | |
773 | default: | |
ab144f5e AK |
774 | ret = paravirt_patch_default(type, clobbers, insnbuf, |
775 | addr, len); | |
6487673b JF |
776 | break; |
777 | } | |
778 | ||
779 | return ret; | |
780 | } | |
781 | ||
93b1eab3 | 782 | static const struct pv_info xen_info __initdata = { |
5ead97c8 JF |
783 | .paravirt_enabled = 1, |
784 | .shared_kernel_pmd = 0, | |
785 | ||
786 | .name = "Xen", | |
93b1eab3 | 787 | }; |
5ead97c8 | 788 | |
93b1eab3 | 789 | static const struct pv_init_ops xen_init_ops __initdata = { |
6487673b | 790 | .patch = xen_patch, |
5ead97c8 | 791 | |
93b1eab3 | 792 | .banner = xen_banner, |
5ead97c8 JF |
793 | .memory_setup = xen_memory_setup, |
794 | .arch_setup = xen_arch_setup, | |
e2426cf8 | 795 | .post_allocator_init = xen_post_allocator_init, |
93b1eab3 | 796 | }; |
5ead97c8 | 797 | |
93b1eab3 | 798 | static const struct pv_time_ops xen_time_ops __initdata = { |
15c84731 | 799 | .time_init = xen_time_init, |
93b1eab3 | 800 | |
15c84731 JF |
801 | .set_wallclock = xen_set_wallclock, |
802 | .get_wallclock = xen_get_wallclock, | |
e93ef949 | 803 | .get_tsc_khz = xen_tsc_khz, |
ab550288 | 804 | .sched_clock = xen_sched_clock, |
93b1eab3 | 805 | }; |
15c84731 | 806 | |
93b1eab3 | 807 | static const struct pv_cpu_ops xen_cpu_ops __initdata = { |
5ead97c8 JF |
808 | .cpuid = xen_cpuid, |
809 | ||
810 | .set_debugreg = xen_set_debugreg, | |
811 | .get_debugreg = xen_get_debugreg, | |
812 | ||
7b1333aa | 813 | .clts = xen_clts, |
5ead97c8 JF |
814 | |
815 | .read_cr0 = native_read_cr0, | |
7b1333aa | 816 | .write_cr0 = xen_write_cr0, |
5ead97c8 | 817 | |
5ead97c8 JF |
818 | .read_cr4 = native_read_cr4, |
819 | .read_cr4_safe = native_read_cr4_safe, | |
820 | .write_cr4 = xen_write_cr4, | |
821 | ||
5ead97c8 JF |
822 | .wbinvd = native_wbinvd, |
823 | ||
824 | .read_msr = native_read_msr_safe, | |
1153968a | 825 | .write_msr = xen_write_msr_safe, |
5ead97c8 JF |
826 | .read_tsc = native_read_tsc, |
827 | .read_pmc = native_read_pmc, | |
828 | ||
81e103f1 | 829 | .iret = xen_iret, |
d75cd22f | 830 | .irq_enable_sysexit = xen_sysexit, |
6fcac6d3 JF |
831 | #ifdef CONFIG_X86_64 |
832 | .usergs_sysret32 = xen_sysret32, | |
833 | .usergs_sysret64 = xen_sysret64, | |
834 | #endif | |
5ead97c8 JF |
835 | |
836 | .load_tr_desc = paravirt_nop, | |
837 | .set_ldt = xen_set_ldt, | |
838 | .load_gdt = xen_load_gdt, | |
839 | .load_idt = xen_load_idt, | |
840 | .load_tls = xen_load_tls, | |
a8fc1089 EH |
841 | #ifdef CONFIG_X86_64 |
842 | .load_gs_index = xen_load_gs_index, | |
843 | #endif | |
5ead97c8 | 844 | |
38ffbe66 JF |
845 | .alloc_ldt = xen_alloc_ldt, |
846 | .free_ldt = xen_free_ldt, | |
847 | ||
5ead97c8 JF |
848 | .store_gdt = native_store_gdt, |
849 | .store_idt = native_store_idt, | |
850 | .store_tr = xen_store_tr, | |
851 | ||
852 | .write_ldt_entry = xen_write_ldt_entry, | |
853 | .write_gdt_entry = xen_write_gdt_entry, | |
854 | .write_idt_entry = xen_write_idt_entry, | |
faca6227 | 855 | .load_sp0 = xen_load_sp0, |
5ead97c8 JF |
856 | |
857 | .set_iopl_mask = xen_set_iopl_mask, | |
858 | .io_delay = xen_io_delay, | |
859 | ||
952d1d70 JF |
860 | /* Xen takes care of %gs when switching to usermode for us */ |
861 | .swapgs = paravirt_nop, | |
862 | ||
224101ed JF |
863 | .start_context_switch = paravirt_start_context_switch, |
864 | .end_context_switch = xen_end_context_switch, | |
93b1eab3 JF |
865 | }; |
866 | ||
93b1eab3 | 867 | static const struct pv_apic_ops xen_apic_ops __initdata = { |
5ead97c8 | 868 | #ifdef CONFIG_X86_LOCAL_APIC |
5ead97c8 JF |
869 | .setup_boot_clock = paravirt_nop, |
870 | .setup_secondary_clock = paravirt_nop, | |
871 | .startup_ipi_hook = paravirt_nop, | |
872 | #endif | |
93b1eab3 JF |
873 | }; |
874 | ||
fefa629a JF |
875 | static void xen_reboot(int reason) |
876 | { | |
349c709f JF |
877 | struct sched_shutdown r = { .reason = reason }; |
878 | ||
fefa629a JF |
879 | #ifdef CONFIG_SMP |
880 | smp_send_stop(); | |
881 | #endif | |
882 | ||
349c709f | 883 | if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r)) |
fefa629a JF |
884 | BUG(); |
885 | } | |
886 | ||
887 | static void xen_restart(char *msg) | |
888 | { | |
889 | xen_reboot(SHUTDOWN_reboot); | |
890 | } | |
891 | ||
892 | static void xen_emergency_restart(void) | |
893 | { | |
894 | xen_reboot(SHUTDOWN_reboot); | |
895 | } | |
896 | ||
897 | static void xen_machine_halt(void) | |
898 | { | |
899 | xen_reboot(SHUTDOWN_poweroff); | |
900 | } | |
901 | ||
902 | static void xen_crash_shutdown(struct pt_regs *regs) | |
903 | { | |
904 | xen_reboot(SHUTDOWN_crash); | |
905 | } | |
906 | ||
907 | static const struct machine_ops __initdata xen_machine_ops = { | |
908 | .restart = xen_restart, | |
909 | .halt = xen_machine_halt, | |
910 | .power_off = xen_machine_halt, | |
911 | .shutdown = xen_machine_halt, | |
912 | .crash_shutdown = xen_crash_shutdown, | |
913 | .emergency_restart = xen_emergency_restart, | |
914 | }; | |
915 | ||
5ead97c8 JF |
916 | /* First C function to be called on Xen boot */ |
917 | asmlinkage void __init xen_start_kernel(void) | |
918 | { | |
919 | pgd_t *pgd; | |
920 | ||
921 | if (!xen_start_info) | |
922 | return; | |
923 | ||
6e833587 JF |
924 | xen_domain_type = XEN_PV_DOMAIN; |
925 | ||
7999f4b4 | 926 | BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0); |
5ead97c8 | 927 | |
e57778a1 JF |
928 | xen_setup_features(); |
929 | ||
5ead97c8 | 930 | /* Install Xen paravirt ops */ |
93b1eab3 JF |
931 | pv_info = xen_info; |
932 | pv_init_ops = xen_init_ops; | |
933 | pv_time_ops = xen_time_ops; | |
934 | pv_cpu_ops = xen_cpu_ops; | |
93b1eab3 JF |
935 | pv_apic_ops = xen_apic_ops; |
936 | pv_mmu_ops = xen_mmu_ops; | |
93b1eab3 | 937 | |
0d1edf46 JF |
938 | xen_init_irq_ops(); |
939 | ||
e826fe1b JF |
940 | xen_init_cpuid_mask(); |
941 | ||
94a8c3c2 | 942 | #ifdef CONFIG_X86_LOCAL_APIC |
ad66dd34 | 943 | /* |
94a8c3c2 | 944 | * set up the basic apic ops. |
ad66dd34 | 945 | */ |
c1eeb2de | 946 | set_xen_basic_apic_ops(); |
ad66dd34 | 947 | #endif |
93b1eab3 | 948 | |
e57778a1 JF |
949 | if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) { |
950 | pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start; | |
951 | pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit; | |
952 | } | |
953 | ||
fefa629a JF |
954 | machine_ops = xen_machine_ops; |
955 | ||
38341432 JF |
956 | #ifdef CONFIG_X86_64 |
957 | /* | |
958 | * Setup percpu state. We only need to do this for 64-bit | |
959 | * because 32-bit already has %fs set properly. | |
960 | */ | |
795f99b6 | 961 | load_percpu_segment(0); |
38341432 JF |
962 | #endif |
963 | /* | |
964 | * The only reliable way to retain the initial address of the | |
965 | * percpu gdt_page is to remember it here, so we can go and | |
966 | * mark it RW later, when the initial percpu area is freed. | |
967 | */ | |
968 | xen_initial_gdt = &per_cpu(gdt_page, 0); | |
795f99b6 | 969 | |
a9e7062d | 970 | xen_smp_init(); |
5ead97c8 JF |
971 | |
972 | /* Get mfn list */ | |
973 | if (!xen_feature(XENFEAT_auto_translated_physmap)) | |
d451bb7a | 974 | xen_build_dynamic_phys_to_machine(); |
5ead97c8 JF |
975 | |
976 | pgd = (pgd_t *)xen_start_info->pt_base; | |
977 | ||
084a2a4e JF |
978 | /* Prevent unwanted bits from being set in PTEs. */ |
979 | __supported_pte_mask &= ~_PAGE_GLOBAL; | |
6e833587 | 980 | if (!xen_initial_domain()) |
084a2a4e | 981 | __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); |
60223a32 | 982 | |
707ebbc8 JF |
983 | #ifdef CONFIG_X86_64 |
984 | /* Work out if we support NX */ | |
985 | check_efer(); | |
986 | #endif | |
987 | ||
60223a32 | 988 | /* Don't do the full vcpu_info placement stuff until we have a |
2e8fe719 | 989 | possible map and a non-dummy shared_info. */ |
60223a32 | 990 | per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0]; |
5ead97c8 | 991 | |
55d80856 JF |
992 | local_irq_disable(); |
993 | early_boot_irqs_off(); | |
994 | ||
084a2a4e | 995 | xen_raw_console_write("mapping kernel into physical memory\n"); |
d114e198 | 996 | pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages); |
5ead97c8 | 997 | |
084a2a4e | 998 | init_mm.pgd = pgd; |
5ead97c8 JF |
999 | |
1000 | /* keep using Xen gdt for now; no urgent need to change it */ | |
1001 | ||
93b1eab3 | 1002 | pv_info.kernel_rpl = 1; |
5ead97c8 | 1003 | if (xen_feature(XENFEAT_supervisor_mode_kernel)) |
93b1eab3 | 1004 | pv_info.kernel_rpl = 0; |
5ead97c8 JF |
1005 | |
1006 | /* set the limit of our address space */ | |
fb1d8404 | 1007 | xen_reserve_top(); |
5ead97c8 | 1008 | |
7d087b68 | 1009 | #ifdef CONFIG_X86_32 |
5ead97c8 JF |
1010 | /* set up basic CPUID stuff */ |
1011 | cpu_detect(&new_cpu_data); | |
1012 | new_cpu_data.hard_math = 1; | |
1013 | new_cpu_data.x86_capability[0] = cpuid_edx(1); | |
7d087b68 | 1014 | #endif |
5ead97c8 JF |
1015 | |
1016 | /* Poke various useful things into boot_params */ | |
30c82645 PA |
1017 | boot_params.hdr.type_of_loader = (9 << 4) | 0; |
1018 | boot_params.hdr.ramdisk_image = xen_start_info->mod_start | |
1019 | ? __pa(xen_start_info->mod_start) : 0; | |
1020 | boot_params.hdr.ramdisk_size = xen_start_info->mod_len; | |
b7c3c5c1 | 1021 | boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line); |
5ead97c8 | 1022 | |
6e833587 | 1023 | if (!xen_initial_domain()) { |
83abc70a | 1024 | add_preferred_console("xenboot", 0, NULL); |
9e124fe1 | 1025 | add_preferred_console("tty", 0, NULL); |
b8c2d3df | 1026 | add_preferred_console("hvc", 0, NULL); |
9e124fe1 | 1027 | } |
b8c2d3df | 1028 | |
084a2a4e JF |
1029 | xen_raw_console_write("about to get started...\n"); |
1030 | ||
5ead97c8 | 1031 | /* Start the world */ |
f5d36de0 | 1032 | #ifdef CONFIG_X86_32 |
f0d43100 | 1033 | i386_start_kernel(); |
f5d36de0 | 1034 | #else |
084a2a4e | 1035 | x86_64_start_reservations((char *)__pa_symbol(&boot_params)); |
f5d36de0 | 1036 | #endif |
5ead97c8 | 1037 | } |