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Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001/*
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>
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -070018#include <linux/hardirq.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070019#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>
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -070025#include <linux/mm.h>
26#include <linux/page-flags.h>
27#include <linux/highmem.h>
Markus Armbrusterb8c2d3d2008-02-27 14:56:35 +010028#include <linux/console.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070029
30#include <xen/interface/xen.h>
31#include <xen/interface/physdev.h>
32#include <xen/interface/vcpu.h>
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -070033#include <xen/interface/sched.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070034#include <xen/features.h>
35#include <xen/page.h>
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -070036#include <xen/hvc-console.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070037
38#include <asm/paravirt.h>
39#include <asm/page.h>
40#include <asm/xen/hypercall.h>
41#include <asm/xen/hypervisor.h>
42#include <asm/fixmap.h>
43#include <asm/processor.h>
Jeremy Fitzhardinge11539682008-07-08 15:07:16 -070044#include <asm/msr-index.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070045#include <asm/setup.h>
46#include <asm/desc.h>
47#include <asm/pgtable.h>
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -070048#include <asm/tlbflush.h>
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -070049#include <asm/reboot.h>
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070050
51#include "xen-ops.h"
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -070052#include "mmu.h"
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070053#include "multicalls.h"
54
55EXPORT_SYMBOL_GPL(hypercall_page);
56
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070057DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
58DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -070059
60/*
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -070061 * Identity map, in addition to plain kernel map. This needs to be
62 * large enough to allocate page table pages to allocate the rest.
63 * Each page can map 2MB.
64 */
65static pte_t level1_ident_pgt[PTRS_PER_PTE * 4] __page_aligned_bss;
66
67#ifdef CONFIG_X86_64
68/* l3 pud for userspace vsyscall mapping */
69static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;
70#endif /* CONFIG_X86_64 */
71
72/*
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -070073 * Note about cr3 (pagetable base) values:
74 *
75 * xen_cr3 contains the current logical cr3 value; it contains the
76 * last set cr3. This may not be the current effective cr3, because
77 * its update may be being lazily deferred. However, a vcpu looking
78 * at its own cr3 can use this value knowing that it everything will
79 * be self-consistent.
80 *
81 * xen_current_cr3 contains the actual vcpu cr3; it is set once the
82 * hypercall to set the vcpu cr3 is complete (so it may be a little
83 * out of date, but it will never be set early). If one vcpu is
84 * looking at another vcpu's cr3 value, it should use this variable.
85 */
86DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
87DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -070088
89struct start_info *xen_start_info;
90EXPORT_SYMBOL_GPL(xen_start_info);
91
Jeremy Fitzhardingea0d695c2008-05-26 23:31:21 +010092struct shared_info xen_dummy_shared_info;
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -070093
94/*
95 * Point at some empty memory to start with. We map the real shared_info
96 * page as soon as fixmap is up and running.
97 */
Jeremy Fitzhardingea0d695c2008-05-26 23:31:21 +010098struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -070099
100/*
101 * Flag to determine whether vcpu info placement is available on all
102 * VCPUs. We assume it is to start with, and then set it to zero on
103 * the first failure. This is because it can succeed on some VCPUs
104 * and not others, since it can involve hypervisor memory allocation,
105 * or because the guest failed to guarantee all the appropriate
106 * constraints on all VCPUs (ie buffer can't cross a page boundary).
107 *
108 * Note that any particular CPU may be using a placed vcpu structure,
109 * but we can only optimise if the all are.
110 *
111 * 0: not available, 1: available
112 */
Jeremy Fitzhardinge04c44a02008-03-17 16:36:52 -0700113static int have_vcpu_info_placement = 1;
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700114
Jeremy Fitzhardinge9c7a7942008-05-31 01:33:02 +0100115static void xen_vcpu_setup(int cpu)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700116{
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700117 struct vcpu_register_vcpu_info info;
118 int err;
119 struct vcpu_info *vcpup;
120
Jeremy Fitzhardingea0d695c2008-05-26 23:31:21 +0100121 BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700122 per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700123
124 if (!have_vcpu_info_placement)
125 return; /* already tested, not available */
126
127 vcpup = &per_cpu(xen_vcpu_info, cpu);
128
129 info.mfn = virt_to_mfn(vcpup);
130 info.offset = offset_in_page(vcpup);
131
Jeremy Fitzhardingee3d26972007-10-16 11:51:31 -0700132 printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700133 cpu, vcpup, info.mfn, info.offset);
134
135 /* Check to see if the hypervisor will put the vcpu_info
136 structure where we want it, which allows direct access via
137 a percpu-variable. */
138 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
139
140 if (err) {
141 printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
142 have_vcpu_info_placement = 0;
143 } else {
144 /* This cpu is using the registered vcpu info, even if
145 later ones fail to. */
146 per_cpu(xen_vcpu, cpu) = vcpup;
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -0700147
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700148 printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n",
149 cpu, vcpup);
150 }
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700151}
152
Jeremy Fitzhardinge9c7a7942008-05-31 01:33:02 +0100153/*
154 * On restore, set the vcpu placement up again.
155 * If it fails, then we're in a bad state, since
156 * we can't back out from using it...
157 */
158void xen_vcpu_restore(void)
159{
160 if (have_vcpu_info_placement) {
161 int cpu;
162
163 for_each_online_cpu(cpu) {
164 bool other_cpu = (cpu != smp_processor_id());
165
166 if (other_cpu &&
167 HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL))
168 BUG();
169
170 xen_vcpu_setup(cpu);
171
172 if (other_cpu &&
173 HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
174 BUG();
175 }
176
177 BUG_ON(!have_vcpu_info_placement);
178 }
179}
180
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700181static void __init xen_banner(void)
182{
183 printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -0700184 pv_info.name);
Jeremy Fitzhardingee57778a2008-06-16 04:30:02 -0700185 printk(KERN_INFO "Hypervisor signature: %s%s\n",
186 xen_start_info->magic,
187 xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700188}
189
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100190static void xen_cpuid(unsigned int *ax, unsigned int *bx,
191 unsigned int *cx, unsigned int *dx)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700192{
193 unsigned maskedx = ~0;
194
195 /*
196 * Mask out inconvenient features, to try and disable as many
197 * unsupported kernel subsystems as possible.
198 */
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100199 if (*ax == 1)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700200 maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */
201 (1 << X86_FEATURE_ACPI) | /* disable ACPI */
Jeremy Fitzhardingedbe9e992008-03-17 16:37:21 -0700202 (1 << X86_FEATURE_MCE) | /* disable MCE */
203 (1 << X86_FEATURE_MCA) | /* disable MCA */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700204 (1 << X86_FEATURE_ACC)); /* thermal monitoring */
205
206 asm(XEN_EMULATE_PREFIX "cpuid"
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100207 : "=a" (*ax),
208 "=b" (*bx),
209 "=c" (*cx),
210 "=d" (*dx)
211 : "0" (*ax), "2" (*cx));
212 *dx &= maskedx;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700213}
214
215static void xen_set_debugreg(int reg, unsigned long val)
216{
217 HYPERVISOR_set_debugreg(reg, val);
218}
219
220static unsigned long xen_get_debugreg(int reg)
221{
222 return HYPERVISOR_get_debugreg(reg);
223}
224
225static unsigned long xen_save_fl(void)
226{
227 struct vcpu_info *vcpu;
228 unsigned long flags;
229
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700230 vcpu = x86_read_percpu(xen_vcpu);
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700231
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700232 /* flag has opposite sense of mask */
233 flags = !vcpu->evtchn_upcall_mask;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700234
235 /* convert to IF type flag
236 -0 -> 0x00000000
237 -1 -> 0xffffffff
238 */
239 return (-flags) & X86_EFLAGS_IF;
240}
241
242static void xen_restore_fl(unsigned long flags)
243{
244 struct vcpu_info *vcpu;
245
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700246 /* convert from IF type flag */
247 flags = !(flags & X86_EFLAGS_IF);
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700248
249 /* There's a one instruction preempt window here. We need to
250 make sure we're don't switch CPUs between getting the vcpu
251 pointer and updating the mask. */
252 preempt_disable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700253 vcpu = x86_read_percpu(xen_vcpu);
254 vcpu->evtchn_upcall_mask = flags;
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700255 preempt_enable_no_resched();
256
257 /* Doesn't matter if we get preempted here, because any
258 pending event will get dealt with anyway. */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700259
260 if (flags == 0) {
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700261 preempt_check_resched();
262 barrier(); /* unmask then check (avoid races) */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700263 if (unlikely(vcpu->evtchn_upcall_pending))
264 force_evtchn_callback();
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700265 }
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700266}
267
268static void xen_irq_disable(void)
269{
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700270 /* There's a one instruction preempt window here. We need to
271 make sure we're don't switch CPUs between getting the vcpu
272 pointer and updating the mask. */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700273 preempt_disable();
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700274 x86_read_percpu(xen_vcpu)->evtchn_upcall_mask = 1;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700275 preempt_enable_no_resched();
276}
277
278static void xen_irq_enable(void)
279{
280 struct vcpu_info *vcpu;
281
Jeremy Fitzhardinge239d1fc2008-05-26 23:31:05 +0100282 /* We don't need to worry about being preempted here, since
283 either a) interrupts are disabled, so no preemption, or b)
284 the caller is confused and is trying to re-enable interrupts
285 on an indeterminate processor. */
286
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700287 vcpu = x86_read_percpu(xen_vcpu);
288 vcpu->evtchn_upcall_mask = 0;
289
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700290 /* Doesn't matter if we get preempted here, because any
291 pending event will get dealt with anyway. */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700292
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700293 barrier(); /* unmask then check (avoid races) */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700294 if (unlikely(vcpu->evtchn_upcall_pending))
295 force_evtchn_callback();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700296}
297
298static void xen_safe_halt(void)
299{
300 /* Blocking includes an implicit local_irq_enable(). */
Jeremy Fitzhardinge349c7092008-05-26 23:31:02 +0100301 if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700302 BUG();
303}
304
305static void xen_halt(void)
306{
307 if (irqs_disabled())
308 HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
309 else
310 xen_safe_halt();
311}
312
Jeremy Fitzhardinge8965c1c2007-10-16 11:51:29 -0700313static void xen_leave_lazy(void)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700314{
Jeremy Fitzhardinge8965c1c2007-10-16 11:51:29 -0700315 paravirt_leave_lazy(paravirt_get_lazy_mode());
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700316 xen_mc_flush();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700317}
318
319static unsigned long xen_store_tr(void)
320{
321 return 0;
322}
323
324static void xen_set_ldt(const void *addr, unsigned entries)
325{
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700326 struct mmuext_op *op;
327 struct multicall_space mcs = xen_mc_entry(sizeof(*op));
328
329 op = mcs.args;
330 op->cmd = MMUEXT_SET_LDT;
Jan Beulich4dbf7af2008-01-30 13:33:14 +0100331 op->arg1.linear_addr = (unsigned long)addr;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700332 op->arg2.nr_ents = entries;
333
334 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
335
336 xen_mc_issue(PARAVIRT_LAZY_CPU);
337}
338
Glauber de Oliveira Costa6b68f012008-01-30 13:31:12 +0100339static void xen_load_gdt(const struct desc_ptr *dtr)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700340{
341 unsigned long *frames;
342 unsigned long va = dtr->address;
343 unsigned int size = dtr->size + 1;
344 unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
345 int f;
346 struct multicall_space mcs;
347
348 /* A GDT can be up to 64k in size, which corresponds to 8192
349 8-byte entries, or 16 4k pages.. */
350
351 BUG_ON(size > 65536);
352 BUG_ON(va & ~PAGE_MASK);
353
354 mcs = xen_mc_entry(sizeof(*frames) * pages);
355 frames = mcs.args;
356
357 for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
358 frames[f] = virt_to_mfn(va);
359 make_lowmem_page_readonly((void *)va);
360 }
361
362 MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
363
364 xen_mc_issue(PARAVIRT_LAZY_CPU);
365}
366
367static void load_TLS_descriptor(struct thread_struct *t,
368 unsigned int cpu, unsigned int i)
369{
370 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
371 xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
372 struct multicall_space mc = __xen_mc_entry(0);
373
374 MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
375}
376
377static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
378{
Jeremy Fitzhardinge8b84ad92007-07-17 18:37:06 -0700379 /*
380 * XXX sleazy hack: If we're being called in a lazy-cpu zone,
381 * it means we're in a context switch, and %gs has just been
382 * saved. This means we can zero it out to prevent faults on
383 * exit from the hypervisor if the next process has no %gs.
384 * Either way, it has been saved, and the new value will get
385 * loaded properly. This will go away as soon as Xen has been
386 * modified to not save/restore %gs for normal hypercalls.
Eduardo Habkost8a954082008-07-08 15:07:10 -0700387 *
388 * On x86_64, this hack is not used for %gs, because gs points
389 * to KERNEL_GS_BASE (and uses it for PDA references), so we
390 * must not zero %gs on x86_64
391 *
392 * For x86_64, we need to zero %fs, otherwise we may get an
393 * exception between the new %fs descriptor being loaded and
394 * %fs being effectively cleared at __switch_to().
Jeremy Fitzhardinge8b84ad92007-07-17 18:37:06 -0700395 */
Eduardo Habkost8a954082008-07-08 15:07:10 -0700396 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
397#ifdef CONFIG_X86_32
Jeremy Fitzhardinge8b84ad92007-07-17 18:37:06 -0700398 loadsegment(gs, 0);
Eduardo Habkost8a954082008-07-08 15:07:10 -0700399#else
400 loadsegment(fs, 0);
401#endif
402 }
403
404 xen_mc_batch();
405
406 load_TLS_descriptor(t, cpu, 0);
407 load_TLS_descriptor(t, cpu, 1);
408 load_TLS_descriptor(t, cpu, 2);
409
410 xen_mc_issue(PARAVIRT_LAZY_CPU);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700411}
412
Eduardo Habkosta8fc1082008-07-08 15:07:05 -0700413#ifdef CONFIG_X86_64
414static void xen_load_gs_index(unsigned int idx)
415{
416 if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
417 BUG();
418}
419#endif
420
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700421static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
Glauber de Oliveira Costa75b8bb32008-01-30 13:31:13 +0100422 const void *ptr)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700423{
424 unsigned long lp = (unsigned long)&dt[entrynum];
425 xmaddr_t mach_lp = virt_to_machine(lp);
Glauber de Oliveira Costa75b8bb32008-01-30 13:31:13 +0100426 u64 entry = *(u64 *)ptr;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700427
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700428 preempt_disable();
429
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700430 xen_mc_flush();
431 if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
432 BUG();
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700433
434 preempt_enable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700435}
436
Eduardo Habkoste176d362008-07-08 15:06:59 -0700437static int cvt_gate_to_trap(int vector, const gate_desc *val,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700438 struct trap_info *info)
439{
Eduardo Habkoste176d362008-07-08 15:06:59 -0700440 if (val->type != 0xf && val->type != 0xe)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700441 return 0;
442
443 info->vector = vector;
Eduardo Habkoste176d362008-07-08 15:06:59 -0700444 info->address = gate_offset(*val);
445 info->cs = gate_segment(*val);
446 info->flags = val->dpl;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700447 /* interrupt gates clear IF */
Eduardo Habkoste176d362008-07-08 15:06:59 -0700448 if (val->type == 0xe)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700449 info->flags |= 4;
450
451 return 1;
452}
453
454/* Locations of each CPU's IDT */
Glauber de Oliveira Costa6b68f012008-01-30 13:31:12 +0100455static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700456
457/* Set an IDT entry. If the entry is part of the current IDT, then
458 also update Xen. */
Glauber de Oliveira Costa8d947342008-01-30 13:31:12 +0100459static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700460{
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700461 unsigned long p = (unsigned long)&dt[entrynum];
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700462 unsigned long start, end;
463
464 preempt_disable();
465
466 start = __get_cpu_var(idt_desc).address;
467 end = start + __get_cpu_var(idt_desc).size + 1;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700468
469 xen_mc_flush();
470
Glauber de Oliveira Costa8d947342008-01-30 13:31:12 +0100471 native_write_idt_entry(dt, entrynum, g);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700472
473 if (p >= start && (p + 8) <= end) {
474 struct trap_info info[2];
475
476 info[1].address = 0;
477
Eduardo Habkoste176d362008-07-08 15:06:59 -0700478 if (cvt_gate_to_trap(entrynum, g, &info[0]))
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700479 if (HYPERVISOR_set_trap_table(info))
480 BUG();
481 }
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700482
483 preempt_enable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700484}
485
Glauber de Oliveira Costa6b68f012008-01-30 13:31:12 +0100486static void xen_convert_trap_info(const struct desc_ptr *desc,
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700487 struct trap_info *traps)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700488{
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700489 unsigned in, out, count;
490
Eduardo Habkoste176d362008-07-08 15:06:59 -0700491 count = (desc->size+1) / sizeof(gate_desc);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700492 BUG_ON(count > 256);
493
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700494 for (in = out = 0; in < count; in++) {
Eduardo Habkoste176d362008-07-08 15:06:59 -0700495 gate_desc *entry = (gate_desc*)(desc->address) + in;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700496
Eduardo Habkoste176d362008-07-08 15:06:59 -0700497 if (cvt_gate_to_trap(in, entry, &traps[out]))
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700498 out++;
499 }
500 traps[out].address = 0;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700501}
502
503void xen_copy_trap_info(struct trap_info *traps)
504{
Glauber de Oliveira Costa6b68f012008-01-30 13:31:12 +0100505 const struct desc_ptr *desc = &__get_cpu_var(idt_desc);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700506
507 xen_convert_trap_info(desc, traps);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700508}
509
510/* Load a new IDT into Xen. In principle this can be per-CPU, so we
511 hold a spinlock to protect the static traps[] array (static because
512 it avoids allocation, and saves stack space). */
Glauber de Oliveira Costa6b68f012008-01-30 13:31:12 +0100513static void xen_load_idt(const struct desc_ptr *desc)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700514{
515 static DEFINE_SPINLOCK(lock);
516 static struct trap_info traps[257];
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700517
518 spin_lock(&lock);
519
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700520 __get_cpu_var(idt_desc) = *desc;
521
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700522 xen_convert_trap_info(desc, traps);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700523
524 xen_mc_flush();
525 if (HYPERVISOR_set_trap_table(traps))
526 BUG();
527
528 spin_unlock(&lock);
529}
530
531/* Write a GDT descriptor entry. Ignore LDT descriptors, since
532 they're handled differently. */
533static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
Glauber de Oliveira Costa014b15b2008-01-30 13:31:13 +0100534 const void *desc, int type)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700535{
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700536 preempt_disable();
537
Glauber de Oliveira Costa014b15b2008-01-30 13:31:13 +0100538 switch (type) {
539 case DESC_LDT:
540 case DESC_TSS:
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700541 /* ignore */
542 break;
543
544 default: {
545 xmaddr_t maddr = virt_to_machine(&dt[entry]);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700546
547 xen_mc_flush();
Glauber de Oliveira Costa014b15b2008-01-30 13:31:13 +0100548 if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700549 BUG();
550 }
551
552 }
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700553
554 preempt_enable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700555}
556
H. Peter Anvinfaca6222008-01-30 13:31:02 +0100557static void xen_load_sp0(struct tss_struct *tss,
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700558 struct thread_struct *thread)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700559{
560 struct multicall_space mcs = xen_mc_entry(0);
H. Peter Anvinfaca6222008-01-30 13:31:02 +0100561 MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700562 xen_mc_issue(PARAVIRT_LAZY_CPU);
563}
564
565static void xen_set_iopl_mask(unsigned mask)
566{
567 struct physdev_set_iopl set_iopl;
568
569 /* Force the change at ring 0. */
570 set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
571 HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
572}
573
574static void xen_io_delay(void)
575{
576}
577
578#ifdef CONFIG_X86_LOCAL_APIC
Thomas Gleixner42e0a9a2008-01-30 13:30:15 +0100579static u32 xen_apic_read(unsigned long reg)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700580{
581 return 0;
582}
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700583
Thomas Gleixner42e0a9a2008-01-30 13:30:15 +0100584static void xen_apic_write(unsigned long reg, u32 val)
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700585{
586 /* Warn to see if there's any stray references */
587 WARN_ON(1);
588}
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700589#endif
590
591static void xen_flush_tlb(void)
592{
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700593 struct mmuext_op *op;
Jeremy Fitzhardinge41e332b2008-04-02 10:54:09 -0700594 struct multicall_space mcs;
595
596 preempt_disable();
597
598 mcs = xen_mc_entry(sizeof(*op));
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700599
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700600 op = mcs.args;
601 op->cmd = MMUEXT_TLB_FLUSH_LOCAL;
602 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
603
604 xen_mc_issue(PARAVIRT_LAZY_MMU);
Jeremy Fitzhardinge41e332b2008-04-02 10:54:09 -0700605
606 preempt_enable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700607}
608
609static void xen_flush_tlb_single(unsigned long addr)
610{
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700611 struct mmuext_op *op;
Jeremy Fitzhardinge41e332b2008-04-02 10:54:09 -0700612 struct multicall_space mcs;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700613
Jeremy Fitzhardinge41e332b2008-04-02 10:54:09 -0700614 preempt_disable();
615
616 mcs = xen_mc_entry(sizeof(*op));
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700617 op = mcs.args;
618 op->cmd = MMUEXT_INVLPG_LOCAL;
619 op->arg1.linear_addr = addr & PAGE_MASK;
620 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
621
622 xen_mc_issue(PARAVIRT_LAZY_MMU);
Jeremy Fitzhardinge41e332b2008-04-02 10:54:09 -0700623
624 preempt_enable();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700625}
626
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700627static void xen_flush_tlb_others(const cpumask_t *cpus, struct mm_struct *mm,
628 unsigned long va)
629{
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700630 struct {
631 struct mmuext_op op;
632 cpumask_t mask;
633 } *args;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700634 cpumask_t cpumask = *cpus;
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700635 struct multicall_space mcs;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700636
637 /*
638 * A couple of (to be removed) sanity checks:
639 *
640 * - current CPU must not be in mask
641 * - mask must exist :)
642 */
643 BUG_ON(cpus_empty(cpumask));
644 BUG_ON(cpu_isset(smp_processor_id(), cpumask));
645 BUG_ON(!mm);
646
647 /* If a CPU which we ran on has gone down, OK. */
648 cpus_and(cpumask, cpumask, cpu_online_map);
649 if (cpus_empty(cpumask))
650 return;
651
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700652 mcs = xen_mc_entry(sizeof(*args));
653 args = mcs.args;
654 args->mask = cpumask;
655 args->op.arg2.vcpumask = &args->mask;
656
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700657 if (va == TLB_FLUSH_ALL) {
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700658 args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700659 } else {
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700660 args->op.cmd = MMUEXT_INVLPG_MULTI;
661 args->op.arg1.linear_addr = va;
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700662 }
663
Jeremy Fitzhardinged66bf8f2007-07-17 18:37:06 -0700664 MULTI_mmuext_op(mcs.mc, &args->op, 1, NULL, DOMID_SELF);
665
666 xen_mc_issue(PARAVIRT_LAZY_MMU);
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -0700667}
668
Jeremy Fitzhardinge7b1333a2008-05-26 23:31:01 +0100669static void xen_clts(void)
670{
671 struct multicall_space mcs;
672
673 mcs = xen_mc_entry(0);
674
675 MULTI_fpu_taskswitch(mcs.mc, 0);
676
677 xen_mc_issue(PARAVIRT_LAZY_CPU);
678}
679
680static void xen_write_cr0(unsigned long cr0)
681{
682 struct multicall_space mcs;
683
684 /* Only pay attention to cr0.TS; everything else is
685 ignored. */
686 mcs = xen_mc_entry(0);
687
688 MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
689
690 xen_mc_issue(PARAVIRT_LAZY_CPU);
691}
692
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700693static void xen_write_cr2(unsigned long cr2)
694{
695 x86_read_percpu(xen_vcpu)->arch.cr2 = cr2;
696}
697
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700698static unsigned long xen_read_cr2(void)
699{
700 return x86_read_percpu(xen_vcpu)->arch.cr2;
701}
702
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -0700703static unsigned long xen_read_cr2_direct(void)
704{
705 return x86_read_percpu(xen_vcpu_info.arch.cr2);
706}
707
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700708static void xen_write_cr4(unsigned long cr4)
709{
Jeremy Fitzhardinge2956a352008-05-26 23:31:04 +0100710 cr4 &= ~X86_CR4_PGE;
711 cr4 &= ~X86_CR4_PSE;
712
713 native_write_cr4(cr4);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700714}
715
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700716static unsigned long xen_read_cr3(void)
717{
718 return x86_read_percpu(xen_cr3);
719}
720
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -0700721static void set_current_cr3(void *v)
722{
723 x86_write_percpu(xen_current_cr3, (unsigned long)v);
724}
725
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700726static void __xen_write_cr3(bool kernel, unsigned long cr3)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700727{
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -0700728 struct mmuext_op *op;
729 struct multicall_space mcs;
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700730 unsigned long mfn;
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -0700731
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700732 if (cr3)
733 mfn = pfn_to_mfn(PFN_DOWN(cr3));
734 else
735 mfn = 0;
736
737 WARN_ON(mfn == 0 && kernel);
738
739 mcs = __xen_mc_entry(sizeof(*op));
740
741 op = mcs.args;
742 op->cmd = kernel ? MMUEXT_NEW_BASEPTR : MMUEXT_NEW_USER_BASEPTR;
743 op->arg1.mfn = mfn;
744
745 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
746
747 if (kernel) {
748 x86_write_percpu(xen_cr3, cr3);
749
750 /* Update xen_current_cr3 once the batch has actually
751 been submitted. */
752 xen_mc_callback(set_current_cr3, (void *)cr3);
753 }
754}
755
756static void xen_write_cr3(unsigned long cr3)
757{
Jeremy Fitzhardingef120f132007-07-17 18:37:06 -0700758 BUG_ON(preemptible());
759
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700760 xen_mc_batch(); /* disables interrupts */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700761
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -0700762 /* Update while interrupts are disabled, so its atomic with
763 respect to ipis */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700764 x86_write_percpu(xen_cr3, cr3);
765
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700766 __xen_write_cr3(true, cr3);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700767
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700768#ifdef CONFIG_X86_64
769 {
770 pgd_t *user_pgd = xen_get_user_pgd(__va(cr3));
771 if (user_pgd)
772 __xen_write_cr3(false, __pa(user_pgd));
773 else
774 __xen_write_cr3(false, 0);
775 }
776#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700777
Jeremy Fitzhardinge9f799912007-10-16 11:51:30 -0700778 xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700779}
780
Jeremy Fitzhardinge11539682008-07-08 15:07:16 -0700781static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
782{
783 int ret;
784
785 ret = 0;
786
787 switch(msr) {
788#ifdef CONFIG_X86_64
789 unsigned which;
790 u64 base;
791
792 case MSR_FS_BASE: which = SEGBASE_FS; goto set;
793 case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
794 case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
795
796 set:
797 base = ((u64)high << 32) | low;
798 if (HYPERVISOR_set_segment_base(which, base) != 0)
799 ret = -EFAULT;
800 break;
801#endif
802 default:
803 ret = native_write_msr_safe(msr, low, high);
804 }
805
806 return ret;
807}
808
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700809/* Early in boot, while setting up the initial pagetable, assume
810 everything is pinned. */
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700811static __init void xen_alloc_pte_init(struct mm_struct *mm, u32 pfn)
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700812{
Jeremy Fitzhardingeaf7ae3b2008-04-02 10:54:12 -0700813#ifdef CONFIG_FLATMEM
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700814 BUG_ON(mem_map); /* should only be used early */
Jeremy Fitzhardingeaf7ae3b2008-04-02 10:54:12 -0700815#endif
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700816 make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
817}
818
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700819/* Early release_pte assumes that all pts are pinned, since there's
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100820 only init_mm and anything attached to that is pinned. */
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700821static void xen_release_pte_init(u32 pfn)
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100822{
823 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
824}
825
Mark McLoughlinf6433702008-04-02 15:36:36 +0100826static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700827{
828 struct mmuext_op op;
Mark McLoughlinf6433702008-04-02 15:36:36 +0100829 op.cmd = cmd;
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700830 op.arg1.mfn = pfn_to_mfn(pfn);
831 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
832 BUG();
833}
834
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700835/* This needs to make sure the new pte page is pinned iff its being
836 attached to a pinned pagetable. */
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100837static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700838{
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700839 struct page *page = pfn_to_page(pfn);
840
841 if (PagePinned(virt_to_page(mm->pgd))) {
842 SetPagePinned(page);
843
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700844 if (!PageHighMem(page)) {
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700845 make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
Mark McLoughlinf6433702008-04-02 15:36:36 +0100846 if (level == PT_PTE)
847 pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700848 } else
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700849 /* make sure there are no stray mappings of
850 this page */
851 kmap_flush_unused();
852 }
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700853}
854
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700855static void xen_alloc_pte(struct mm_struct *mm, u32 pfn)
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100856{
Mark McLoughlinf6433702008-04-02 15:36:36 +0100857 xen_alloc_ptpage(mm, pfn, PT_PTE);
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100858}
859
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700860static void xen_alloc_pmd(struct mm_struct *mm, u32 pfn)
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100861{
Mark McLoughlinf6433702008-04-02 15:36:36 +0100862 xen_alloc_ptpage(mm, pfn, PT_PMD);
Jeremy Fitzhardinge1c70e9b2008-01-30 13:33:39 +0100863}
864
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700865static int xen_pgd_alloc(struct mm_struct *mm)
866{
867 pgd_t *pgd = mm->pgd;
868 int ret = 0;
869
870 BUG_ON(PagePinned(virt_to_page(pgd)));
871
872#ifdef CONFIG_X86_64
873 {
874 struct page *page = virt_to_page(pgd);
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -0700875 pgd_t *user_pgd;
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700876
877 BUG_ON(page->private != 0);
878
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -0700879 ret = -ENOMEM;
880
881 user_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
882 page->private = (unsigned long)user_pgd;
883
884 if (user_pgd != NULL) {
885 user_pgd[pgd_index(VSYSCALL_START)] =
886 __pgd(__pa(level3_user_vsyscall) | _PAGE_TABLE);
887 ret = 0;
888 }
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -0700889
890 BUG_ON(PagePinned(virt_to_page(xen_get_user_pgd(pgd))));
891 }
892#endif
893
894 return ret;
895}
896
897static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd)
898{
899#ifdef CONFIG_X86_64
900 pgd_t *user_pgd = xen_get_user_pgd(pgd);
901
902 if (user_pgd)
903 free_page((unsigned long)user_pgd);
904#endif
905}
906
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700907/* This should never happen until we're OK to use struct page */
Mark McLoughlinf6433702008-04-02 15:36:36 +0100908static void xen_release_ptpage(u32 pfn, unsigned level)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700909{
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700910 struct page *page = pfn_to_page(pfn);
911
912 if (PagePinned(page)) {
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700913 if (!PageHighMem(page)) {
Mark McLoughlina684d692008-04-02 15:36:37 +0100914 if (level == PT_PTE)
915 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700916 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
Jeremy Fitzhardinge74260712007-10-16 11:51:30 -0700917 }
Mark McLoughlinc946c7d2008-04-02 15:36:38 +0100918 ClearPagePinned(page);
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700919 }
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700920}
921
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700922static void xen_release_pte(u32 pfn)
Mark McLoughlinf6433702008-04-02 15:36:36 +0100923{
924 xen_release_ptpage(pfn, PT_PTE);
925}
926
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -0700927static void xen_release_pmd(u32 pfn)
Mark McLoughlinf6433702008-04-02 15:36:36 +0100928{
929 xen_release_ptpage(pfn, PT_PMD);
930}
931
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -0700932#if PAGETABLE_LEVELS == 4
933static void xen_alloc_pud(struct mm_struct *mm, u32 pfn)
934{
935 xen_alloc_ptpage(mm, pfn, PT_PUD);
936}
937
938static void xen_release_pud(u32 pfn)
939{
940 xen_release_ptpage(pfn, PT_PUD);
941}
942#endif
943
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700944#ifdef CONFIG_HIGHPTE
945static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700946{
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700947 pgprot_t prot = PAGE_KERNEL;
948
949 if (PagePinned(page))
950 prot = PAGE_KERNEL_RO;
951
952 if (0 && PageHighMem(page))
953 printk("mapping highpte %lx type %d prot %s\n",
954 page_to_pfn(page), type,
955 (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");
956
957 return kmap_atomic_prot(page, type, prot);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700958}
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -0700959#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700960
Jeremy Fitzhardinge9a4029f2007-07-17 18:37:05 -0700961static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
962{
963 /* If there's an existing pte, then don't allow _PAGE_RW to be set */
964 if (pte_val_ma(*ptep) & _PAGE_PRESENT)
965 pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
966 pte_val_ma(pte));
967
968 return pte;
969}
970
971/* Init-time set_pte while constructing initial pagetables, which
972 doesn't allow RO pagetable pages to be remapped RW */
973static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)
974{
975 pte = mask_rw_pte(ptep, pte);
976
977 xen_set_pte(ptep, pte);
978}
979
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700980static __init void xen_pagetable_setup_start(pgd_t *base)
981{
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -0700982}
983
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +0100984void xen_setup_shared_info(void)
Jeremy Fitzhardinge2e8fe712008-03-17 16:36:53 -0700985{
986 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
Jeremy Fitzhardinge15664f92008-07-08 15:06:47 -0700987 set_fixmap(FIX_PARAVIRT_BOOTMAP,
988 xen_start_info->shared_info);
Jeremy Fitzhardinge2e8fe712008-03-17 16:36:53 -0700989
Jeremy Fitzhardinge15664f92008-07-08 15:06:47 -0700990 HYPERVISOR_shared_info =
991 (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
Jeremy Fitzhardinge2e8fe712008-03-17 16:36:53 -0700992 } else
993 HYPERVISOR_shared_info =
994 (struct shared_info *)__va(xen_start_info->shared_info);
995
996#ifndef CONFIG_SMP
997 /* In UP this is as good a place as any to set up shared info */
998 xen_setup_vcpu_info_placement();
999#endif
Jeremy Fitzhardinged5edbc12008-05-26 23:31:22 +01001000
1001 xen_setup_mfn_list_list();
Jeremy Fitzhardinge2e8fe712008-03-17 16:36:53 -07001002}
1003
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001004static __init void xen_pagetable_setup_done(pgd_t *base)
1005{
Jeremy Fitzhardinge8745f8b2008-07-08 15:06:57 -07001006 xen_setup_shared_info();
1007}
1008
1009static __init void xen_post_allocator_init(void)
1010{
1011 pv_mmu_ops.set_pte = xen_set_pte;
1012 pv_mmu_ops.set_pmd = xen_set_pmd;
1013 pv_mmu_ops.set_pud = xen_set_pud;
1014#if PAGETABLE_LEVELS == 4
1015 pv_mmu_ops.set_pgd = xen_set_pgd;
1016#endif
1017
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -07001018 /* This will work as long as patching hasn't happened yet
1019 (which it hasn't) */
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -07001020 pv_mmu_ops.alloc_pte = xen_alloc_pte;
1021 pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
1022 pv_mmu_ops.release_pte = xen_release_pte;
1023 pv_mmu_ops.release_pmd = xen_release_pmd;
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -07001024#if PAGETABLE_LEVELS == 4
1025 pv_mmu_ops.alloc_pud = xen_alloc_pud;
1026 pv_mmu_ops.release_pud = xen_release_pud;
1027#endif
1028
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -07001029#ifdef CONFIG_X86_64
1030 SetPagePinned(virt_to_page(level3_user_vsyscall));
1031#endif
Jeremy Fitzhardingee2426cf2008-05-31 01:24:27 +01001032 xen_mark_init_mm_pinned();
1033}
1034
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -07001035/* This is called once we have the cpu_possible_map */
Jeremy Fitzhardinge0e913982008-05-26 23:31:27 +01001036void xen_setup_vcpu_info_placement(void)
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -07001037{
1038 int cpu;
1039
1040 for_each_possible_cpu(cpu)
1041 xen_vcpu_setup(cpu);
1042
1043 /* xen_vcpu_setup managed to place the vcpu_info within the
1044 percpu area for all cpus, so make use of it */
Jeremy Fitzhardinge5b09b282008-07-08 15:06:42 -07001045#ifdef CONFIG_X86_32
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -07001046 if (have_vcpu_info_placement) {
1047 printk(KERN_INFO "Xen: using vcpu_info placement\n");
1048
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001049 pv_irq_ops.save_fl = xen_save_fl_direct;
1050 pv_irq_ops.restore_fl = xen_restore_fl_direct;
1051 pv_irq_ops.irq_disable = xen_irq_disable_direct;
1052 pv_irq_ops.irq_enable = xen_irq_enable_direct;
1053 pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
Jeremy Fitzhardinge60223a32007-07-17 18:37:07 -07001054 }
Jeremy Fitzhardinge5b09b282008-07-08 15:06:42 -07001055#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001056}
1057
Andi Kleenab144f52007-08-10 22:31:03 +02001058static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
1059 unsigned long addr, unsigned len)
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001060{
1061 char *start, *end, *reloc;
1062 unsigned ret;
1063
1064 start = end = reloc = NULL;
1065
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001066#define SITE(op, x) \
1067 case PARAVIRT_PATCH(op.x): \
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001068 if (have_vcpu_info_placement) { \
1069 start = (char *)xen_##x##_direct; \
1070 end = xen_##x##_direct_end; \
1071 reloc = xen_##x##_direct_reloc; \
1072 } \
1073 goto patch_site
1074
1075 switch (type) {
Jeremy Fitzhardinge5b09b282008-07-08 15:06:42 -07001076#ifdef CONFIG_X86_32
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001077 SITE(pv_irq_ops, irq_enable);
1078 SITE(pv_irq_ops, irq_disable);
1079 SITE(pv_irq_ops, save_fl);
1080 SITE(pv_irq_ops, restore_fl);
Jeremy Fitzhardinge5b09b282008-07-08 15:06:42 -07001081#endif /* CONFIG_X86_32 */
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001082#undef SITE
1083
1084 patch_site:
1085 if (start == NULL || (end-start) > len)
1086 goto default_patch;
1087
Andi Kleenab144f52007-08-10 22:31:03 +02001088 ret = paravirt_patch_insns(insnbuf, len, start, end);
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001089
1090 /* Note: because reloc is assigned from something that
1091 appears to be an array, gcc assumes it's non-null,
1092 but doesn't know its relationship with start and
1093 end. */
1094 if (reloc > start && reloc < end) {
1095 int reloc_off = reloc - start;
Andi Kleenab144f52007-08-10 22:31:03 +02001096 long *relocp = (long *)(insnbuf + reloc_off);
1097 long delta = start - (char *)addr;
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001098
1099 *relocp += delta;
1100 }
1101 break;
1102
1103 default_patch:
1104 default:
Andi Kleenab144f52007-08-10 22:31:03 +02001105 ret = paravirt_patch_default(type, clobbers, insnbuf,
1106 addr, len);
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001107 break;
1108 }
1109
1110 return ret;
1111}
1112
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -07001113static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot)
1114{
1115 pte_t pte;
1116
1117 phys >>= PAGE_SHIFT;
1118
1119 switch (idx) {
1120 case FIX_BTMAP_END ... FIX_BTMAP_BEGIN:
1121#ifdef CONFIG_X86_F00F_BUG
1122 case FIX_F00F_IDT:
1123#endif
Jeremy Fitzhardinge15664f92008-07-08 15:06:47 -07001124#ifdef CONFIG_X86_32
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -07001125 case FIX_WP_TEST:
1126 case FIX_VDSO:
Jeremy Fitzhardinge15664f92008-07-08 15:06:47 -07001127 case FIX_KMAP_BEGIN ... FIX_KMAP_END:
1128#else
1129 case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
1130#endif
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -07001131#ifdef CONFIG_X86_LOCAL_APIC
1132 case FIX_APIC_BASE: /* maps dummy local APIC */
1133#endif
1134 pte = pfn_pte(phys, prot);
1135 break;
1136
1137 default:
1138 pte = mfn_pte(phys, prot);
1139 break;
1140 }
1141
1142 __native_set_fixmap(idx, pte);
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -07001143
1144#ifdef CONFIG_X86_64
1145 /* Replicate changes to map the vsyscall page into the user
1146 pagetable vsyscall mapping. */
1147 if (idx >= VSYSCALL_LAST_PAGE && idx <= VSYSCALL_FIRST_PAGE) {
1148 unsigned long vaddr = __fix_to_virt(idx);
1149 set_pte_vaddr_pud(level3_user_vsyscall, vaddr, pte);
1150 }
1151#endif
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -07001152}
1153
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001154static const struct pv_info xen_info __initdata = {
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001155 .paravirt_enabled = 1,
1156 .shared_kernel_pmd = 0,
1157
1158 .name = "Xen",
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001159};
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001160
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001161static const struct pv_init_ops xen_init_ops __initdata = {
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001162 .patch = xen_patch,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001163
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001164 .banner = xen_banner,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001165 .memory_setup = xen_memory_setup,
1166 .arch_setup = xen_arch_setup,
Jeremy Fitzhardingee2426cf2008-05-31 01:24:27 +01001167 .post_allocator_init = xen_post_allocator_init,
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001168};
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001169
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001170static const struct pv_time_ops xen_time_ops __initdata = {
Jeremy Fitzhardinge15c84732007-07-17 18:37:05 -07001171 .time_init = xen_time_init,
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001172
Jeremy Fitzhardinge15c84732007-07-17 18:37:05 -07001173 .set_wallclock = xen_set_wallclock,
1174 .get_wallclock = xen_get_wallclock,
Alok Katariae93ef942008-07-01 11:43:36 -07001175 .get_tsc_khz = xen_tsc_khz,
Jeremy Fitzhardingeab550282007-07-17 18:37:05 -07001176 .sched_clock = xen_sched_clock,
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001177};
Jeremy Fitzhardinge15c84732007-07-17 18:37:05 -07001178
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001179static const struct pv_cpu_ops xen_cpu_ops __initdata = {
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001180 .cpuid = xen_cpuid,
1181
1182 .set_debugreg = xen_set_debugreg,
1183 .get_debugreg = xen_get_debugreg,
1184
Jeremy Fitzhardinge7b1333a2008-05-26 23:31:01 +01001185 .clts = xen_clts,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001186
1187 .read_cr0 = native_read_cr0,
Jeremy Fitzhardinge7b1333a2008-05-26 23:31:01 +01001188 .write_cr0 = xen_write_cr0,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001189
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001190 .read_cr4 = native_read_cr4,
1191 .read_cr4_safe = native_read_cr4_safe,
1192 .write_cr4 = xen_write_cr4,
1193
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001194 .wbinvd = native_wbinvd,
1195
1196 .read_msr = native_read_msr_safe,
Jeremy Fitzhardinge11539682008-07-08 15:07:16 -07001197 .write_msr = xen_write_msr_safe,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001198 .read_tsc = native_read_tsc,
1199 .read_pmc = native_read_pmc,
1200
Jeremy Fitzhardinge81e103f2008-04-17 17:40:51 +02001201 .iret = xen_iret,
Jeremy Fitzhardinged75cd222008-06-25 00:19:26 -04001202 .irq_enable_sysexit = xen_sysexit,
Jeremy Fitzhardinge6fcac6d2008-07-08 15:07:14 -07001203#ifdef CONFIG_X86_64
1204 .usergs_sysret32 = xen_sysret32,
1205 .usergs_sysret64 = xen_sysret64,
1206#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001207
1208 .load_tr_desc = paravirt_nop,
1209 .set_ldt = xen_set_ldt,
1210 .load_gdt = xen_load_gdt,
1211 .load_idt = xen_load_idt,
1212 .load_tls = xen_load_tls,
Eduardo Habkosta8fc1082008-07-08 15:07:05 -07001213#ifdef CONFIG_X86_64
1214 .load_gs_index = xen_load_gs_index,
1215#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001216
1217 .store_gdt = native_store_gdt,
1218 .store_idt = native_store_idt,
1219 .store_tr = xen_store_tr,
1220
1221 .write_ldt_entry = xen_write_ldt_entry,
1222 .write_gdt_entry = xen_write_gdt_entry,
1223 .write_idt_entry = xen_write_idt_entry,
H. Peter Anvinfaca6222008-01-30 13:31:02 +01001224 .load_sp0 = xen_load_sp0,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001225
1226 .set_iopl_mask = xen_set_iopl_mask,
1227 .io_delay = xen_io_delay,
1228
Jeremy Fitzhardinge952d1d72008-07-08 15:07:01 -07001229 /* Xen takes care of %gs when switching to usermode for us */
1230 .swapgs = paravirt_nop,
1231
Jeremy Fitzhardinge8965c1c2007-10-16 11:51:29 -07001232 .lazy_mode = {
1233 .enter = paravirt_enter_lazy_cpu,
1234 .leave = xen_leave_lazy,
1235 },
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001236};
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001237
Jeremy Fitzhardinge0725cbb2008-07-08 15:07:03 -07001238static void __init __xen_init_IRQ(void)
1239{
1240#ifdef CONFIG_X86_64
1241 int i;
1242
1243 /* Create identity vector->irq map */
1244 for(i = 0; i < NR_VECTORS; i++) {
1245 int cpu;
1246
1247 for_each_possible_cpu(cpu)
1248 per_cpu(vector_irq, cpu)[i] = i;
1249 }
1250#endif /* CONFIG_X86_64 */
1251
1252 xen_init_IRQ();
1253}
1254
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001255static const struct pv_irq_ops xen_irq_ops __initdata = {
Jeremy Fitzhardinge0725cbb2008-07-08 15:07:03 -07001256 .init_IRQ = __xen_init_IRQ,
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001257 .save_fl = xen_save_fl,
1258 .restore_fl = xen_restore_fl,
1259 .irq_disable = xen_irq_disable,
1260 .irq_enable = xen_irq_enable,
1261 .safe_halt = xen_safe_halt,
1262 .halt = xen_halt,
Jeremy Fitzhardingefab58422008-06-25 00:19:31 -04001263#ifdef CONFIG_X86_64
Jeremy Fitzhardinge997409d2008-07-08 15:07:00 -07001264 .adjust_exception_frame = xen_adjust_exception_frame,
Jeremy Fitzhardingefab58422008-06-25 00:19:31 -04001265#endif
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001266};
1267
1268static const struct pv_apic_ops xen_apic_ops __initdata = {
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001269#ifdef CONFIG_X86_LOCAL_APIC
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001270 .apic_write = xen_apic_write,
1271 .apic_write_atomic = xen_apic_write,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001272 .apic_read = xen_apic_read,
1273 .setup_boot_clock = paravirt_nop,
1274 .setup_secondary_clock = paravirt_nop,
1275 .startup_ipi_hook = paravirt_nop,
1276#endif
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001277};
1278
1279static const struct pv_mmu_ops xen_mmu_ops __initdata = {
1280 .pagetable_setup_start = xen_pagetable_setup_start,
1281 .pagetable_setup_done = xen_pagetable_setup_done,
1282
1283 .read_cr2 = xen_read_cr2,
1284 .write_cr2 = xen_write_cr2,
1285
1286 .read_cr3 = xen_read_cr3,
1287 .write_cr3 = xen_write_cr3,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001288
1289 .flush_tlb_user = xen_flush_tlb,
1290 .flush_tlb_kernel = xen_flush_tlb,
1291 .flush_tlb_single = xen_flush_tlb_single,
Jeremy Fitzhardingef87e4ca2007-07-17 18:37:06 -07001292 .flush_tlb_others = xen_flush_tlb_others,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001293
1294 .pte_update = paravirt_nop,
1295 .pte_update_defer = paravirt_nop,
1296
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -07001297 .pgd_alloc = xen_pgd_alloc,
1298 .pgd_free = xen_pgd_free,
Jeremy Fitzhardingeeba00452008-06-25 00:19:12 -04001299
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -07001300 .alloc_pte = xen_alloc_pte_init,
1301 .release_pte = xen_release_pte_init,
1302 .alloc_pmd = xen_alloc_pte_init,
1303 .alloc_pmd_clone = paravirt_nop,
1304 .release_pmd = xen_release_pte_init,
Jeremy Fitzhardingef4f97b32007-07-17 18:37:05 -07001305
1306#ifdef CONFIG_HIGHPTE
1307 .kmap_atomic_pte = xen_kmap_atomic_pte,
1308#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001309
Jeremy Fitzhardinge22911b32008-07-08 15:06:51 -07001310#ifdef CONFIG_X86_64
1311 .set_pte = xen_set_pte,
1312#else
Jeremy Fitzhardinge851fa3c2008-07-08 15:06:33 -07001313 .set_pte = xen_set_pte_init,
Jeremy Fitzhardinge22911b32008-07-08 15:06:51 -07001314#endif
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001315 .set_pte_at = xen_set_pte_at,
Jeremy Fitzhardingee2426cf2008-05-31 01:24:27 +01001316 .set_pmd = xen_set_pmd_hyper,
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001317
Jeremy Fitzhardinge08b882c2008-06-16 04:30:01 -07001318 .ptep_modify_prot_start = __ptep_modify_prot_start,
1319 .ptep_modify_prot_commit = __ptep_modify_prot_commit,
1320
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001321 .pte_val = xen_pte_val,
Jeremy Fitzhardingea15af1c2008-05-26 23:31:06 +01001322 .pte_flags = native_pte_val,
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001323 .pgd_val = xen_pgd_val,
1324
1325 .make_pte = xen_make_pte,
1326 .make_pgd = xen_make_pgd,
1327
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -07001328#ifdef CONFIG_X86_PAE
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001329 .set_pte_atomic = xen_set_pte_atomic,
1330 .set_pte_present = xen_set_pte_at,
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001331 .pte_clear = xen_pte_clear,
1332 .pmd_clear = xen_pmd_clear,
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -07001333#endif /* CONFIG_X86_PAE */
1334 .set_pud = xen_set_pud_hyper,
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001335
1336 .make_pmd = xen_make_pmd,
1337 .pmd_val = xen_pmd_val,
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001338
Jeremy Fitzhardingef6e58732008-07-08 15:06:38 -07001339#if PAGETABLE_LEVELS == 4
1340 .pud_val = xen_pud_val,
1341 .make_pud = xen_make_pud,
1342 .set_pgd = xen_set_pgd_hyper,
1343
1344 .alloc_pud = xen_alloc_pte_init,
1345 .release_pud = xen_release_pte_init,
1346#endif /* PAGETABLE_LEVELS == 4 */
1347
Jeremy Fitzhardinge3b827c12007-07-17 18:37:04 -07001348 .activate_mm = xen_activate_mm,
1349 .dup_mmap = xen_dup_mmap,
1350 .exit_mmap = xen_exit_mmap,
1351
Jeremy Fitzhardinge8965c1c2007-10-16 11:51:29 -07001352 .lazy_mode = {
1353 .enter = paravirt_enter_lazy_mmu,
1354 .leave = xen_leave_lazy,
1355 },
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -07001356
1357 .set_fixmap = xen_set_fixmap,
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001358};
1359
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -07001360static void xen_reboot(int reason)
1361{
Jeremy Fitzhardinge349c7092008-05-26 23:31:02 +01001362 struct sched_shutdown r = { .reason = reason };
1363
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -07001364#ifdef CONFIG_SMP
1365 smp_send_stop();
1366#endif
1367
Jeremy Fitzhardinge349c7092008-05-26 23:31:02 +01001368 if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -07001369 BUG();
1370}
1371
1372static void xen_restart(char *msg)
1373{
1374 xen_reboot(SHUTDOWN_reboot);
1375}
1376
1377static void xen_emergency_restart(void)
1378{
1379 xen_reboot(SHUTDOWN_reboot);
1380}
1381
1382static void xen_machine_halt(void)
1383{
1384 xen_reboot(SHUTDOWN_poweroff);
1385}
1386
1387static void xen_crash_shutdown(struct pt_regs *regs)
1388{
1389 xen_reboot(SHUTDOWN_crash);
1390}
1391
1392static const struct machine_ops __initdata xen_machine_ops = {
1393 .restart = xen_restart,
1394 .halt = xen_machine_halt,
1395 .power_off = xen_machine_halt,
1396 .shutdown = xen_machine_halt,
1397 .crash_shutdown = xen_crash_shutdown,
1398 .emergency_restart = xen_emergency_restart,
1399};
1400
Jeremy Fitzhardinge64876732007-07-17 18:37:07 -07001401
Jeremy Fitzhardingefb1d8402007-10-16 11:51:31 -07001402static void __init xen_reserve_top(void)
1403{
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001404#ifdef CONFIG_X86_32
Jeremy Fitzhardingefb1d8402007-10-16 11:51:31 -07001405 unsigned long top = HYPERVISOR_VIRT_START;
1406 struct xen_platform_parameters pp;
1407
1408 if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
1409 top = pp.virt_start;
1410
1411 reserve_top_address(-top + 2 * PAGE_SIZE);
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001412#endif /* CONFIG_X86_32 */
Jeremy Fitzhardingefb1d8402007-10-16 11:51:31 -07001413}
1414
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001415/*
1416 * Like __va(), but returns address in the kernel mapping (which is
1417 * all we have until the physical memory mapping has been set up.
1418 */
1419static void *__ka(phys_addr_t paddr)
1420{
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001421#ifdef CONFIG_X86_64
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001422 return (void *)(paddr + __START_KERNEL_map);
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001423#else
1424 return __va(paddr);
1425#endif
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001426}
1427
1428/* Convert a machine address to physical address */
1429static unsigned long m2p(phys_addr_t maddr)
1430{
1431 phys_addr_t paddr;
1432
1433 maddr &= PTE_MASK;
1434 paddr = mfn_to_pfn(maddr >> PAGE_SHIFT) << PAGE_SHIFT;
1435
1436 return paddr;
1437}
1438
1439/* Convert a machine address to kernel virtual */
1440static void *m2v(phys_addr_t maddr)
1441{
1442 return __ka(m2p(maddr));
1443}
1444
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001445#ifdef CONFIG_X86_64
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001446static void walk(pgd_t *pgd, unsigned long addr)
1447{
1448 unsigned l4idx = pgd_index(addr);
1449 unsigned l3idx = pud_index(addr);
1450 unsigned l2idx = pmd_index(addr);
1451 unsigned l1idx = pte_index(addr);
1452 pgd_t l4;
1453 pud_t l3;
1454 pmd_t l2;
1455 pte_t l1;
1456
1457 xen_raw_printk("walk %p, %lx -> %d %d %d %d\n",
1458 pgd, addr, l4idx, l3idx, l2idx, l1idx);
1459
1460 l4 = pgd[l4idx];
1461 xen_raw_printk(" l4: %016lx\n", l4.pgd);
1462 xen_raw_printk(" %016lx\n", pgd_val(l4));
1463
1464 l3 = ((pud_t *)(m2v(l4.pgd)))[l3idx];
1465 xen_raw_printk(" l3: %016lx\n", l3.pud);
1466 xen_raw_printk(" %016lx\n", pud_val(l3));
1467
1468 l2 = ((pmd_t *)(m2v(l3.pud)))[l2idx];
1469 xen_raw_printk(" l2: %016lx\n", l2.pmd);
1470 xen_raw_printk(" %016lx\n", pmd_val(l2));
1471
1472 l1 = ((pte_t *)(m2v(l2.pmd)))[l1idx];
1473 xen_raw_printk(" l1: %016lx\n", l1.pte);
1474 xen_raw_printk(" %016lx\n", pte_val(l1));
1475}
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001476#endif
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001477
1478static void set_page_prot(void *addr, pgprot_t prot)
1479{
1480 unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
1481 pte_t pte = pfn_pte(pfn, prot);
1482
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001483 xen_raw_printk("addr=%p pfn=%lx mfn=%lx prot=%016llx pte=%016llx\n",
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001484 addr, pfn, get_phys_to_machine(pfn),
1485 pgprot_val(prot), pte.pte);
1486
1487 if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
1488 BUG();
1489}
1490
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001491static __init void xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001492{
1493 unsigned pmdidx, pteidx;
1494 unsigned ident_pte;
1495 unsigned long pfn;
1496
1497 ident_pte = 0;
1498 pfn = 0;
1499 for(pmdidx = 0; pmdidx < PTRS_PER_PMD && pfn < max_pfn; pmdidx++) {
1500 pte_t *pte_page;
1501
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001502 /* Reuse or allocate a page of ptes */
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001503 if (pmd_present(pmd[pmdidx]))
1504 pte_page = m2v(pmd[pmdidx].pmd);
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001505 else {
1506 /* Check for free pte pages */
1507 if (ident_pte == ARRAY_SIZE(level1_ident_pgt))
1508 break;
1509
1510 pte_page = &level1_ident_pgt[ident_pte];
1511 ident_pte += PTRS_PER_PTE;
1512
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001513 pmd[pmdidx] = __pmd(__pa(pte_page) | _PAGE_TABLE);
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001514 }
1515
1516 /* Install mappings */
1517 for(pteidx = 0; pteidx < PTRS_PER_PTE; pteidx++, pfn++) {
1518 pte_t pte;
1519
1520 if (pfn > max_pfn_mapped)
1521 max_pfn_mapped = pfn;
1522
1523 if (!pte_none(pte_page[pteidx]))
1524 continue;
1525
1526 pte = pfn_pte(pfn, PAGE_KERNEL_EXEC);
1527 pte_page[pteidx] = pte;
1528 }
1529 }
1530
1531 for(pteidx = 0; pteidx < ident_pte; pteidx += PTRS_PER_PTE)
1532 set_page_prot(&level1_ident_pgt[pteidx], PAGE_KERNEL_RO);
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001533
1534 set_page_prot(pmd, PAGE_KERNEL_RO);
1535}
1536
1537#ifdef CONFIG_X86_64
1538static void convert_pfn_mfn(void *v)
1539{
1540 pte_t *pte = v;
1541 int i;
1542
1543 /* All levels are converted the same way, so just treat them
1544 as ptes. */
1545 for(i = 0; i < PTRS_PER_PTE; i++)
1546 pte[i] = xen_make_pte(pte[i].pte);
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001547}
1548
1549/*
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001550 * Set up the inital kernel pagetable.
1551 *
1552 * We can construct this by grafting the Xen provided pagetable into
1553 * head_64.S's preconstructed pagetables. We copy the Xen L2's into
1554 * level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
1555 * means that only the kernel has a physical mapping to start with -
1556 * but that's enough to get __va working. We need to fill in the rest
1557 * of the physical mapping once some sort of allocator has been set
1558 * up.
1559 */
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001560static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001561{
1562 pud_t *l3;
1563 pmd_t *l2;
1564
1565 /* Zap identity mapping */
1566 init_level4_pgt[0] = __pgd(0);
1567
1568 /* Pre-constructed entries are in pfn, so convert to mfn */
1569 convert_pfn_mfn(init_level4_pgt);
1570 convert_pfn_mfn(level3_ident_pgt);
1571 convert_pfn_mfn(level3_kernel_pgt);
1572
1573 l3 = m2v(pgd[pgd_index(__START_KERNEL_map)].pgd);
1574 l2 = m2v(l3[pud_index(__START_KERNEL_map)].pud);
1575
1576 memcpy(level2_ident_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1577 memcpy(level2_kernel_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1578
1579 l3 = m2v(pgd[pgd_index(__START_KERNEL_map + PMD_SIZE)].pgd);
1580 l2 = m2v(l3[pud_index(__START_KERNEL_map + PMD_SIZE)].pud);
1581 memcpy(level2_fixmap_pgt, l2, sizeof(pmd_t) * PTRS_PER_PMD);
1582
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001583 /* Set up identity map */
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001584 xen_map_identity_early(level2_ident_pgt, max_pfn);
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001585
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001586 /* Make pagetable pieces RO */
1587 set_page_prot(init_level4_pgt, PAGE_KERNEL_RO);
1588 set_page_prot(level3_ident_pgt, PAGE_KERNEL_RO);
1589 set_page_prot(level3_kernel_pgt, PAGE_KERNEL_RO);
Jeremy Fitzhardingebf18bf92008-07-08 15:07:15 -07001590 set_page_prot(level3_user_vsyscall, PAGE_KERNEL_RO);
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001591 set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
1592 set_page_prot(level2_fixmap_pgt, PAGE_KERNEL_RO);
1593
1594 /* Pin down new L4 */
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001595 pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
1596 PFN_DOWN(__pa_symbol(init_level4_pgt)));
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001597
1598 /* Unpin Xen-provided one */
1599 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
1600
1601 /* Switch over */
1602 pgd = init_level4_pgt;
Jeremy Fitzhardinged6182fb2008-07-08 15:07:13 -07001603
1604 /*
1605 * At this stage there can be no user pgd, and no page
1606 * structure to attach it to, so make sure we just set kernel
1607 * pgd.
1608 */
1609 xen_mc_batch();
1610 __xen_write_cr3(true, __pa(pgd));
1611 xen_mc_issue(PARAVIRT_LAZY_CPU);
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001612
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001613 reserve_early(__pa(xen_start_info->pt_base),
1614 __pa(xen_start_info->pt_base +
1615 xen_start_info->nr_pt_frames * PAGE_SIZE),
1616 "XEN PAGETABLES");
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001617
1618 return pgd;
1619}
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001620#else /* !CONFIG_X86_64 */
1621static pmd_t level2_kernel_pgt[PTRS_PER_PMD] __page_aligned_bss;
1622
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001623static __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001624{
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001625 pmd_t *kernel_pmd;
1626
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001627 init_pg_tables_start = __pa(pgd);
1628 init_pg_tables_end = __pa(pgd) + xen_start_info->nr_pt_frames*PAGE_SIZE;
1629 max_pfn_mapped = PFN_DOWN(init_pg_tables_end + 512*1024);
1630
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001631 kernel_pmd = m2v(pgd[KERNEL_PGD_BOUNDARY].pgd);
1632 memcpy(level2_kernel_pgt, kernel_pmd, sizeof(pmd_t) * PTRS_PER_PMD);
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001633
Jeremy Fitzhardinge39dbc5b2008-07-08 15:06:53 -07001634 xen_map_identity_early(level2_kernel_pgt, max_pfn);
1635
1636 memcpy(swapper_pg_dir, pgd, sizeof(pgd_t) * PTRS_PER_PGD);
1637 set_pgd(&swapper_pg_dir[KERNEL_PGD_BOUNDARY],
1638 __pgd(__pa(level2_kernel_pgt) | _PAGE_PRESENT));
1639
1640 set_page_prot(level2_kernel_pgt, PAGE_KERNEL_RO);
1641 set_page_prot(swapper_pg_dir, PAGE_KERNEL_RO);
1642 set_page_prot(empty_zero_page, PAGE_KERNEL_RO);
1643
1644 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
1645
1646 xen_write_cr3(__pa(swapper_pg_dir));
1647
1648 pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(swapper_pg_dir)));
1649
1650 return swapper_pg_dir;
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001651}
1652#endif /* CONFIG_X86_64 */
1653
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001654/* First C function to be called on Xen boot */
1655asmlinkage void __init xen_start_kernel(void)
1656{
1657 pgd_t *pgd;
1658
1659 if (!xen_start_info)
1660 return;
1661
Jeremy Fitzhardinge7999f4b2007-12-10 13:00:41 -08001662 BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001663
Jeremy Fitzhardingee57778a2008-06-16 04:30:02 -07001664 xen_setup_features();
1665
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001666 /* Install Xen paravirt ops */
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001667 pv_info = xen_info;
1668 pv_init_ops = xen_init_ops;
1669 pv_time_ops = xen_time_ops;
1670 pv_cpu_ops = xen_cpu_ops;
1671 pv_irq_ops = xen_irq_ops;
1672 pv_apic_ops = xen_apic_ops;
1673 pv_mmu_ops = xen_mmu_ops;
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001674
Jeremy Fitzhardingee57778a2008-06-16 04:30:02 -07001675 if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
1676 pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
1677 pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
1678 }
1679
Jeremy Fitzhardingefefa6292007-07-17 18:37:07 -07001680 machine_ops = xen_machine_ops;
1681
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001682#ifdef CONFIG_X86_64
1683 /* Disable until direct per-cpu data access. */
1684 have_vcpu_info_placement = 0;
Jeremy Fitzhardinge5b09b282008-07-08 15:06:42 -07001685 x86_64_init_pda();
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001686#endif
1687
Jeremy Fitzhardingea9e70622008-07-08 15:06:41 -07001688 xen_smp_init();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001689
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001690 /* Get mfn list */
1691 if (!xen_feature(XENFEAT_auto_translated_physmap))
Jeremy Fitzhardinged451bb72008-05-26 23:31:18 +01001692 xen_build_dynamic_phys_to_machine();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001693
1694 pgd = (pgd_t *)xen_start_info->pt_base;
1695
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001696 /* Prevent unwanted bits from being set in PTEs. */
1697 __supported_pte_mask &= ~_PAGE_GLOBAL;
1698 if (!is_initial_xendomain())
1699 __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001700
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001701 /* Don't do the full vcpu_info placement stuff until we have a
1702 possible map and a non-dummy shared_info. */
1703 per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
1704
1705 xen_raw_console_write("mapping kernel into physical memory\n");
Jeremy Fitzhardinged114e1982008-07-08 15:06:52 -07001706 pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001707
1708 init_mm.pgd = pgd;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001709
1710 /* keep using Xen gdt for now; no urgent need to change it */
1711
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001712 pv_info.kernel_rpl = 1;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001713 if (xen_feature(XENFEAT_supervisor_mode_kernel))
Jeremy Fitzhardinge93b1eab2007-10-16 11:51:29 -07001714 pv_info.kernel_rpl = 0;
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001715
1716 /* set the limit of our address space */
Jeremy Fitzhardingefb1d8402007-10-16 11:51:31 -07001717 xen_reserve_top();
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001718
Jeremy Fitzhardinge7d087b62008-07-08 15:06:48 -07001719#ifdef CONFIG_X86_32
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001720 /* set up basic CPUID stuff */
1721 cpu_detect(&new_cpu_data);
1722 new_cpu_data.hard_math = 1;
1723 new_cpu_data.x86_capability[0] = cpuid_edx(1);
Jeremy Fitzhardinge7d087b62008-07-08 15:06:48 -07001724#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001725
1726 /* Poke various useful things into boot_params */
H. Peter Anvin30c82642007-10-15 17:13:22 -07001727 boot_params.hdr.type_of_loader = (9 << 4) | 0;
1728 boot_params.hdr.ramdisk_image = xen_start_info->mod_start
1729 ? __pa(xen_start_info->mod_start) : 0;
1730 boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
Jeremy Fitzhardingeb7c3c5c2008-07-08 15:07:07 -07001731 boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001732
Markus Armbruster9e124fe2008-05-26 23:31:07 +01001733 if (!is_initial_xendomain()) {
Jeremy Fitzhardinge83abc702008-05-26 23:31:12 +01001734 add_preferred_console("xenboot", 0, NULL);
Markus Armbruster9e124fe2008-05-26 23:31:07 +01001735 add_preferred_console("tty", 0, NULL);
Markus Armbrusterb8c2d3d2008-02-27 14:56:35 +01001736 add_preferred_console("hvc", 0, NULL);
Markus Armbruster9e124fe2008-05-26 23:31:07 +01001737 }
Markus Armbrusterb8c2d3d2008-02-27 14:56:35 +01001738
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001739 xen_raw_console_write("about to get started...\n");
1740
1741#if 0
1742 xen_raw_printk("&boot_params=%p __pa(&boot_params)=%lx __va(__pa(&boot_params))=%lx\n",
1743 &boot_params, __pa_symbol(&boot_params),
1744 __va(__pa_symbol(&boot_params)));
1745
1746 walk(pgd, &boot_params);
1747 walk(pgd, __va(__pa(&boot_params)));
1748#endif
1749
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001750 /* Start the world */
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001751#ifdef CONFIG_X86_32
Yinghai Luf0d43102008-05-29 12:56:36 -07001752 i386_start_kernel();
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001753#else
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -07001754 x86_64_start_reservations((char *)__pa_symbol(&boot_params));
Jeremy Fitzhardingef5d36de2008-07-08 15:06:39 -07001755#endif
Jeremy Fitzhardinge5ead97c2007-07-17 18:37:04 -07001756}