2 * Core of Xen paravirt_ops implementation.
4 * This file contains the xen_paravirt_ops structure itself, and the
6 * - privileged instructions
11 * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/smp.h>
17 #include <linux/preempt.h>
18 #include <linux/hardirq.h>
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>
26 #include <linux/page-flags.h>
27 #include <linux/highmem.h>
28 #include <linux/console.h>
30 #include <xen/interface/xen.h>
31 #include <xen/interface/physdev.h>
32 #include <xen/interface/vcpu.h>
33 #include <xen/interface/sched.h>
34 #include <xen/features.h>
36 #include <xen/hvc-console.h>
38 #include <asm/paravirt.h>
40 #include <asm/xen/hypercall.h>
41 #include <asm/xen/hypervisor.h>
42 #include <asm/fixmap.h>
43 #include <asm/processor.h>
44 #include <asm/setup.h>
46 #include <asm/pgtable.h>
47 #include <asm/tlbflush.h>
48 #include <asm/reboot.h>
49 #include <asm/pgalloc.h>
53 #include "multicalls.h"
55 EXPORT_SYMBOL_GPL(hypercall_page
);
57 DEFINE_PER_CPU(struct vcpu_info
*, xen_vcpu
);
58 DEFINE_PER_CPU(struct vcpu_info
, xen_vcpu_info
);
61 * Note about cr3 (pagetable base) values:
63 * xen_cr3 contains the current logical cr3 value; it contains the
64 * last set cr3. This may not be the current effective cr3, because
65 * its update may be being lazily deferred. However, a vcpu looking
66 * at its own cr3 can use this value knowing that it everything will
69 * xen_current_cr3 contains the actual vcpu cr3; it is set once the
70 * hypercall to set the vcpu cr3 is complete (so it may be a little
71 * out of date, but it will never be set early). If one vcpu is
72 * looking at another vcpu's cr3 value, it should use this variable.
74 DEFINE_PER_CPU(unsigned long, xen_cr3
); /* cr3 stored as physaddr */
75 DEFINE_PER_CPU(unsigned long, xen_current_cr3
); /* actual vcpu cr3 */
77 struct start_info
*xen_start_info
;
78 EXPORT_SYMBOL_GPL(xen_start_info
);
80 struct shared_info xen_dummy_shared_info
;
83 * Point at some empty memory to start with. We map the real shared_info
84 * page as soon as fixmap is up and running.
86 struct shared_info
*HYPERVISOR_shared_info
= (void *)&xen_dummy_shared_info
;
89 * Flag to determine whether vcpu info placement is available on all
90 * VCPUs. We assume it is to start with, and then set it to zero on
91 * the first failure. This is because it can succeed on some VCPUs
92 * and not others, since it can involve hypervisor memory allocation,
93 * or because the guest failed to guarantee all the appropriate
94 * constraints on all VCPUs (ie buffer can't cross a page boundary).
96 * Note that any particular CPU may be using a placed vcpu structure,
97 * but we can only optimise if the all are.
99 * 0: not available, 1: available
101 static int have_vcpu_info_placement
= 1;
103 static void xen_vcpu_setup(int cpu
)
105 struct vcpu_register_vcpu_info info
;
107 struct vcpu_info
*vcpup
;
109 BUG_ON(HYPERVISOR_shared_info
== &xen_dummy_shared_info
);
110 per_cpu(xen_vcpu
, cpu
) = &HYPERVISOR_shared_info
->vcpu_info
[cpu
];
112 if (!have_vcpu_info_placement
)
113 return; /* already tested, not available */
115 vcpup
= &per_cpu(xen_vcpu_info
, cpu
);
117 info
.mfn
= virt_to_mfn(vcpup
);
118 info
.offset
= offset_in_page(vcpup
);
120 printk(KERN_DEBUG
"trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
121 cpu
, vcpup
, info
.mfn
, info
.offset
);
123 /* Check to see if the hypervisor will put the vcpu_info
124 structure where we want it, which allows direct access via
125 a percpu-variable. */
126 err
= HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info
, cpu
, &info
);
129 printk(KERN_DEBUG
"register_vcpu_info failed: err=%d\n", err
);
130 have_vcpu_info_placement
= 0;
132 /* This cpu is using the registered vcpu info, even if
133 later ones fail to. */
134 per_cpu(xen_vcpu
, cpu
) = vcpup
;
136 printk(KERN_DEBUG
"cpu %d using vcpu_info at %p\n",
142 * On restore, set the vcpu placement up again.
143 * If it fails, then we're in a bad state, since
144 * we can't back out from using it...
146 void xen_vcpu_restore(void)
148 if (have_vcpu_info_placement
) {
151 for_each_online_cpu(cpu
) {
152 bool other_cpu
= (cpu
!= smp_processor_id());
155 HYPERVISOR_vcpu_op(VCPUOP_down
, cpu
, NULL
))
161 HYPERVISOR_vcpu_op(VCPUOP_up
, cpu
, NULL
))
165 BUG_ON(!have_vcpu_info_placement
);
169 static void __init
xen_banner(void)
171 printk(KERN_INFO
"Booting paravirtualized kernel on %s\n",
173 printk(KERN_INFO
"Hypervisor signature: %s%s\n",
174 xen_start_info
->magic
,
175 xen_feature(XENFEAT_mmu_pt_update_preserve_ad
) ? " (preserve-AD)" : "");
178 static void xen_cpuid(unsigned int *ax
, unsigned int *bx
,
179 unsigned int *cx
, unsigned int *dx
)
181 unsigned maskedx
= ~0;
184 * Mask out inconvenient features, to try and disable as many
185 * unsupported kernel subsystems as possible.
188 maskedx
= ~((1 << X86_FEATURE_APIC
) | /* disable APIC */
189 (1 << X86_FEATURE_ACPI
) | /* disable ACPI */
190 (1 << X86_FEATURE_MCE
) | /* disable MCE */
191 (1 << X86_FEATURE_MCA
) | /* disable MCA */
192 (1 << X86_FEATURE_ACC
)); /* thermal monitoring */
194 asm(XEN_EMULATE_PREFIX
"cpuid"
199 : "0" (*ax
), "2" (*cx
));
203 static void xen_set_debugreg(int reg
, unsigned long val
)
205 HYPERVISOR_set_debugreg(reg
, val
);
208 static unsigned long xen_get_debugreg(int reg
)
210 return HYPERVISOR_get_debugreg(reg
);
213 static unsigned long xen_save_fl(void)
215 struct vcpu_info
*vcpu
;
218 vcpu
= x86_read_percpu(xen_vcpu
);
220 /* flag has opposite sense of mask */
221 flags
= !vcpu
->evtchn_upcall_mask
;
223 /* convert to IF type flag
227 return (-flags
) & X86_EFLAGS_IF
;
230 static void xen_restore_fl(unsigned long flags
)
232 struct vcpu_info
*vcpu
;
234 /* convert from IF type flag */
235 flags
= !(flags
& X86_EFLAGS_IF
);
237 /* There's a one instruction preempt window here. We need to
238 make sure we're don't switch CPUs between getting the vcpu
239 pointer and updating the mask. */
241 vcpu
= x86_read_percpu(xen_vcpu
);
242 vcpu
->evtchn_upcall_mask
= flags
;
243 preempt_enable_no_resched();
245 /* Doesn't matter if we get preempted here, because any
246 pending event will get dealt with anyway. */
249 preempt_check_resched();
250 barrier(); /* unmask then check (avoid races) */
251 if (unlikely(vcpu
->evtchn_upcall_pending
))
252 force_evtchn_callback();
256 static void xen_irq_disable(void)
258 /* There's a one instruction preempt window here. We need to
259 make sure we're don't switch CPUs between getting the vcpu
260 pointer and updating the mask. */
262 x86_read_percpu(xen_vcpu
)->evtchn_upcall_mask
= 1;
263 preempt_enable_no_resched();
266 static void xen_irq_enable(void)
268 struct vcpu_info
*vcpu
;
270 /* We don't need to worry about being preempted here, since
271 either a) interrupts are disabled, so no preemption, or b)
272 the caller is confused and is trying to re-enable interrupts
273 on an indeterminate processor. */
275 vcpu
= x86_read_percpu(xen_vcpu
);
276 vcpu
->evtchn_upcall_mask
= 0;
278 /* Doesn't matter if we get preempted here, because any
279 pending event will get dealt with anyway. */
281 barrier(); /* unmask then check (avoid races) */
282 if (unlikely(vcpu
->evtchn_upcall_pending
))
283 force_evtchn_callback();
286 static void xen_safe_halt(void)
288 /* Blocking includes an implicit local_irq_enable(). */
289 if (HYPERVISOR_sched_op(SCHEDOP_block
, NULL
) != 0)
293 static void xen_halt(void)
296 HYPERVISOR_vcpu_op(VCPUOP_down
, smp_processor_id(), NULL
);
301 static void xen_leave_lazy(void)
303 paravirt_leave_lazy(paravirt_get_lazy_mode());
307 static unsigned long xen_store_tr(void)
312 static void xen_set_ldt(const void *addr
, unsigned entries
)
314 struct mmuext_op
*op
;
315 struct multicall_space mcs
= xen_mc_entry(sizeof(*op
));
318 op
->cmd
= MMUEXT_SET_LDT
;
319 op
->arg1
.linear_addr
= (unsigned long)addr
;
320 op
->arg2
.nr_ents
= entries
;
322 MULTI_mmuext_op(mcs
.mc
, op
, 1, NULL
, DOMID_SELF
);
324 xen_mc_issue(PARAVIRT_LAZY_CPU
);
327 static void xen_load_gdt(const struct desc_ptr
*dtr
)
329 unsigned long *frames
;
330 unsigned long va
= dtr
->address
;
331 unsigned int size
= dtr
->size
+ 1;
332 unsigned pages
= (size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
334 struct multicall_space mcs
;
336 /* A GDT can be up to 64k in size, which corresponds to 8192
337 8-byte entries, or 16 4k pages.. */
339 BUG_ON(size
> 65536);
340 BUG_ON(va
& ~PAGE_MASK
);
342 mcs
= xen_mc_entry(sizeof(*frames
) * pages
);
345 for (f
= 0; va
< dtr
->address
+ size
; va
+= PAGE_SIZE
, f
++) {
346 frames
[f
] = virt_to_mfn(va
);
347 make_lowmem_page_readonly((void *)va
);
350 MULTI_set_gdt(mcs
.mc
, frames
, size
/ sizeof(struct desc_struct
));
352 xen_mc_issue(PARAVIRT_LAZY_CPU
);
355 static void load_TLS_descriptor(struct thread_struct
*t
,
356 unsigned int cpu
, unsigned int i
)
358 struct desc_struct
*gdt
= get_cpu_gdt_table(cpu
);
359 xmaddr_t maddr
= virt_to_machine(&gdt
[GDT_ENTRY_TLS_MIN
+i
]);
360 struct multicall_space mc
= __xen_mc_entry(0);
362 MULTI_update_descriptor(mc
.mc
, maddr
.maddr
, t
->tls_array
[i
]);
365 static void xen_load_tls(struct thread_struct
*t
, unsigned int cpu
)
369 load_TLS_descriptor(t
, cpu
, 0);
370 load_TLS_descriptor(t
, cpu
, 1);
371 load_TLS_descriptor(t
, cpu
, 2);
373 xen_mc_issue(PARAVIRT_LAZY_CPU
);
376 * XXX sleazy hack: If we're being called in a lazy-cpu zone,
377 * it means we're in a context switch, and %gs has just been
378 * saved. This means we can zero it out to prevent faults on
379 * exit from the hypervisor if the next process has no %gs.
380 * Either way, it has been saved, and the new value will get
381 * loaded properly. This will go away as soon as Xen has been
382 * modified to not save/restore %gs for normal hypercalls.
384 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU
)
389 static void xen_load_gs_index(unsigned int idx
)
391 if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL
, idx
))
396 static void xen_write_ldt_entry(struct desc_struct
*dt
, int entrynum
,
399 unsigned long lp
= (unsigned long)&dt
[entrynum
];
400 xmaddr_t mach_lp
= virt_to_machine(lp
);
401 u64 entry
= *(u64
*)ptr
;
406 if (HYPERVISOR_update_descriptor(mach_lp
.maddr
, entry
))
412 static int cvt_gate_to_trap(int vector
, const gate_desc
*val
,
413 struct trap_info
*info
)
415 if (val
->type
!= 0xf && val
->type
!= 0xe)
418 info
->vector
= vector
;
419 info
->address
= gate_offset(*val
);
420 info
->cs
= gate_segment(*val
);
421 info
->flags
= val
->dpl
;
422 /* interrupt gates clear IF */
423 if (val
->type
== 0xe)
429 /* Locations of each CPU's IDT */
430 static DEFINE_PER_CPU(struct desc_ptr
, idt_desc
);
432 /* Set an IDT entry. If the entry is part of the current IDT, then
434 static void xen_write_idt_entry(gate_desc
*dt
, int entrynum
, const gate_desc
*g
)
436 unsigned long p
= (unsigned long)&dt
[entrynum
];
437 unsigned long start
, end
;
441 start
= __get_cpu_var(idt_desc
).address
;
442 end
= start
+ __get_cpu_var(idt_desc
).size
+ 1;
446 native_write_idt_entry(dt
, entrynum
, g
);
448 if (p
>= start
&& (p
+ 8) <= end
) {
449 struct trap_info info
[2];
453 if (cvt_gate_to_trap(entrynum
, g
, &info
[0]))
454 if (HYPERVISOR_set_trap_table(info
))
461 static void xen_convert_trap_info(const struct desc_ptr
*desc
,
462 struct trap_info
*traps
)
464 unsigned in
, out
, count
;
466 count
= (desc
->size
+1) / sizeof(gate_desc
);
469 for (in
= out
= 0; in
< count
; in
++) {
470 gate_desc
*entry
= (gate_desc
*)(desc
->address
) + in
;
472 if (cvt_gate_to_trap(in
, entry
, &traps
[out
]))
475 traps
[out
].address
= 0;
478 void xen_copy_trap_info(struct trap_info
*traps
)
480 const struct desc_ptr
*desc
= &__get_cpu_var(idt_desc
);
482 xen_convert_trap_info(desc
, traps
);
485 /* Load a new IDT into Xen. In principle this can be per-CPU, so we
486 hold a spinlock to protect the static traps[] array (static because
487 it avoids allocation, and saves stack space). */
488 static void xen_load_idt(const struct desc_ptr
*desc
)
490 static DEFINE_SPINLOCK(lock
);
491 static struct trap_info traps
[257];
495 __get_cpu_var(idt_desc
) = *desc
;
497 xen_convert_trap_info(desc
, traps
);
500 if (HYPERVISOR_set_trap_table(traps
))
506 /* Write a GDT descriptor entry. Ignore LDT descriptors, since
507 they're handled differently. */
508 static void xen_write_gdt_entry(struct desc_struct
*dt
, int entry
,
509 const void *desc
, int type
)
520 xmaddr_t maddr
= virt_to_machine(&dt
[entry
]);
523 if (HYPERVISOR_update_descriptor(maddr
.maddr
, *(u64
*)desc
))
532 static void xen_load_sp0(struct tss_struct
*tss
,
533 struct thread_struct
*thread
)
535 struct multicall_space mcs
= xen_mc_entry(0);
536 MULTI_stack_switch(mcs
.mc
, __KERNEL_DS
, thread
->sp0
);
537 xen_mc_issue(PARAVIRT_LAZY_CPU
);
540 static void xen_set_iopl_mask(unsigned mask
)
542 struct physdev_set_iopl set_iopl
;
544 /* Force the change at ring 0. */
545 set_iopl
.iopl
= (mask
== 0) ? 1 : (mask
>> 12) & 3;
546 HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl
, &set_iopl
);
549 static void xen_io_delay(void)
553 #ifdef CONFIG_X86_LOCAL_APIC
554 static u32
xen_apic_read(unsigned long reg
)
559 static void xen_apic_write(unsigned long reg
, u32 val
)
561 /* Warn to see if there's any stray references */
566 static void xen_flush_tlb(void)
568 struct mmuext_op
*op
;
569 struct multicall_space mcs
;
573 mcs
= xen_mc_entry(sizeof(*op
));
576 op
->cmd
= MMUEXT_TLB_FLUSH_LOCAL
;
577 MULTI_mmuext_op(mcs
.mc
, op
, 1, NULL
, DOMID_SELF
);
579 xen_mc_issue(PARAVIRT_LAZY_MMU
);
584 static void xen_flush_tlb_single(unsigned long addr
)
586 struct mmuext_op
*op
;
587 struct multicall_space mcs
;
591 mcs
= xen_mc_entry(sizeof(*op
));
593 op
->cmd
= MMUEXT_INVLPG_LOCAL
;
594 op
->arg1
.linear_addr
= addr
& PAGE_MASK
;
595 MULTI_mmuext_op(mcs
.mc
, op
, 1, NULL
, DOMID_SELF
);
597 xen_mc_issue(PARAVIRT_LAZY_MMU
);
602 static void xen_flush_tlb_others(const cpumask_t
*cpus
, struct mm_struct
*mm
,
609 cpumask_t cpumask
= *cpus
;
610 struct multicall_space mcs
;
613 * A couple of (to be removed) sanity checks:
615 * - current CPU must not be in mask
616 * - mask must exist :)
618 BUG_ON(cpus_empty(cpumask
));
619 BUG_ON(cpu_isset(smp_processor_id(), cpumask
));
622 /* If a CPU which we ran on has gone down, OK. */
623 cpus_and(cpumask
, cpumask
, cpu_online_map
);
624 if (cpus_empty(cpumask
))
627 mcs
= xen_mc_entry(sizeof(*args
));
629 args
->mask
= cpumask
;
630 args
->op
.arg2
.vcpumask
= &args
->mask
;
632 if (va
== TLB_FLUSH_ALL
) {
633 args
->op
.cmd
= MMUEXT_TLB_FLUSH_MULTI
;
635 args
->op
.cmd
= MMUEXT_INVLPG_MULTI
;
636 args
->op
.arg1
.linear_addr
= va
;
639 MULTI_mmuext_op(mcs
.mc
, &args
->op
, 1, NULL
, DOMID_SELF
);
641 xen_mc_issue(PARAVIRT_LAZY_MMU
);
644 static void xen_clts(void)
646 struct multicall_space mcs
;
648 mcs
= xen_mc_entry(0);
650 MULTI_fpu_taskswitch(mcs
.mc
, 0);
652 xen_mc_issue(PARAVIRT_LAZY_CPU
);
655 static void xen_write_cr0(unsigned long cr0
)
657 struct multicall_space mcs
;
659 /* Only pay attention to cr0.TS; everything else is
661 mcs
= xen_mc_entry(0);
663 MULTI_fpu_taskswitch(mcs
.mc
, (cr0
& X86_CR0_TS
) != 0);
665 xen_mc_issue(PARAVIRT_LAZY_CPU
);
668 static void xen_write_cr2(unsigned long cr2
)
670 x86_read_percpu(xen_vcpu
)->arch
.cr2
= cr2
;
673 static unsigned long xen_read_cr2(void)
675 return x86_read_percpu(xen_vcpu
)->arch
.cr2
;
678 static unsigned long xen_read_cr2_direct(void)
680 return x86_read_percpu(xen_vcpu_info
.arch
.cr2
);
683 static void xen_write_cr4(unsigned long cr4
)
688 native_write_cr4(cr4
);
691 static unsigned long xen_read_cr3(void)
693 return x86_read_percpu(xen_cr3
);
696 static void set_current_cr3(void *v
)
698 x86_write_percpu(xen_current_cr3
, (unsigned long)v
);
701 static void xen_write_cr3(unsigned long cr3
)
703 struct mmuext_op
*op
;
704 struct multicall_space mcs
;
705 unsigned long mfn
= pfn_to_mfn(PFN_DOWN(cr3
));
707 BUG_ON(preemptible());
709 mcs
= xen_mc_entry(sizeof(*op
)); /* disables interrupts */
711 /* Update while interrupts are disabled, so its atomic with
713 x86_write_percpu(xen_cr3
, cr3
);
716 op
->cmd
= MMUEXT_NEW_BASEPTR
;
719 MULTI_mmuext_op(mcs
.mc
, op
, 1, NULL
, DOMID_SELF
);
721 /* Update xen_update_cr3 once the batch has actually
723 xen_mc_callback(set_current_cr3
, (void *)cr3
);
725 xen_mc_issue(PARAVIRT_LAZY_CPU
); /* interrupts restored */
728 /* Early in boot, while setting up the initial pagetable, assume
729 everything is pinned. */
730 static __init
void xen_alloc_pte_init(struct mm_struct
*mm
, u32 pfn
)
732 #ifdef CONFIG_FLATMEM
733 BUG_ON(mem_map
); /* should only be used early */
735 make_lowmem_page_readonly(__va(PFN_PHYS(pfn
)));
738 /* Early release_pte assumes that all pts are pinned, since there's
739 only init_mm and anything attached to that is pinned. */
740 static void xen_release_pte_init(u32 pfn
)
742 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn
)));
745 static void pin_pagetable_pfn(unsigned cmd
, unsigned long pfn
)
749 op
.arg1
.mfn
= pfn_to_mfn(pfn
);
750 if (HYPERVISOR_mmuext_op(&op
, 1, NULL
, DOMID_SELF
))
754 /* This needs to make sure the new pte page is pinned iff its being
755 attached to a pinned pagetable. */
756 static void xen_alloc_ptpage(struct mm_struct
*mm
, u32 pfn
, unsigned level
)
758 struct page
*page
= pfn_to_page(pfn
);
760 if (PagePinned(virt_to_page(mm
->pgd
))) {
763 if (!PageHighMem(page
)) {
764 make_lowmem_page_readonly(__va(PFN_PHYS(pfn
)));
766 pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE
, pfn
);
768 /* make sure there are no stray mappings of
774 static void xen_alloc_pte(struct mm_struct
*mm
, u32 pfn
)
776 xen_alloc_ptpage(mm
, pfn
, PT_PTE
);
779 static void xen_alloc_pmd(struct mm_struct
*mm
, u32 pfn
)
781 xen_alloc_ptpage(mm
, pfn
, PT_PMD
);
784 /* This should never happen until we're OK to use struct page */
785 static void xen_release_ptpage(u32 pfn
, unsigned level
)
787 struct page
*page
= pfn_to_page(pfn
);
789 if (PagePinned(page
)) {
790 if (!PageHighMem(page
)) {
792 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE
, pfn
);
793 make_lowmem_page_readwrite(__va(PFN_PHYS(pfn
)));
795 ClearPagePinned(page
);
799 static void xen_release_pte(u32 pfn
)
801 xen_release_ptpage(pfn
, PT_PTE
);
804 static void xen_release_pmd(u32 pfn
)
806 xen_release_ptpage(pfn
, PT_PMD
);
809 #if PAGETABLE_LEVELS == 4
810 static void xen_alloc_pud(struct mm_struct
*mm
, u32 pfn
)
812 xen_alloc_ptpage(mm
, pfn
, PT_PUD
);
815 static void xen_release_pud(u32 pfn
)
817 xen_release_ptpage(pfn
, PT_PUD
);
821 #ifdef CONFIG_HIGHPTE
822 static void *xen_kmap_atomic_pte(struct page
*page
, enum km_type type
)
824 pgprot_t prot
= PAGE_KERNEL
;
826 if (PagePinned(page
))
827 prot
= PAGE_KERNEL_RO
;
829 if (0 && PageHighMem(page
))
830 printk("mapping highpte %lx type %d prot %s\n",
831 page_to_pfn(page
), type
,
832 (unsigned long)pgprot_val(prot
) & _PAGE_RW
? "WRITE" : "READ");
834 return kmap_atomic_prot(page
, type
, prot
);
838 static __init pte_t
mask_rw_pte(pte_t
*ptep
, pte_t pte
)
840 /* If there's an existing pte, then don't allow _PAGE_RW to be set */
841 if (pte_val_ma(*ptep
) & _PAGE_PRESENT
)
842 pte
= __pte_ma(((pte_val_ma(*ptep
) & _PAGE_RW
) | ~_PAGE_RW
) &
848 /* Init-time set_pte while constructing initial pagetables, which
849 doesn't allow RO pagetable pages to be remapped RW */
850 static __init
void xen_set_pte_init(pte_t
*ptep
, pte_t pte
)
852 pte
= mask_rw_pte(ptep
, pte
);
854 xen_set_pte(ptep
, pte
);
857 static __init
void xen_pagetable_setup_start(pgd_t
*base
)
861 void xen_setup_shared_info(void)
863 if (!xen_feature(XENFEAT_auto_translated_physmap
)) {
864 set_fixmap(FIX_PARAVIRT_BOOTMAP
,
865 xen_start_info
->shared_info
);
867 HYPERVISOR_shared_info
=
868 (struct shared_info
*)fix_to_virt(FIX_PARAVIRT_BOOTMAP
);
870 HYPERVISOR_shared_info
=
871 (struct shared_info
*)__va(xen_start_info
->shared_info
);
874 /* In UP this is as good a place as any to set up shared info */
875 xen_setup_vcpu_info_placement();
878 xen_setup_mfn_list_list();
881 static __init
void xen_pagetable_setup_done(pgd_t
*base
)
883 xen_setup_shared_info();
886 static __init
void xen_post_allocator_init(void)
888 pv_mmu_ops
.set_pte
= xen_set_pte
;
889 pv_mmu_ops
.set_pmd
= xen_set_pmd
;
890 pv_mmu_ops
.set_pud
= xen_set_pud
;
891 #if PAGETABLE_LEVELS == 4
892 pv_mmu_ops
.set_pgd
= xen_set_pgd
;
895 /* This will work as long as patching hasn't happened yet
897 pv_mmu_ops
.alloc_pte
= xen_alloc_pte
;
898 pv_mmu_ops
.alloc_pmd
= xen_alloc_pmd
;
899 pv_mmu_ops
.release_pte
= xen_release_pte
;
900 pv_mmu_ops
.release_pmd
= xen_release_pmd
;
901 #if PAGETABLE_LEVELS == 4
902 pv_mmu_ops
.alloc_pud
= xen_alloc_pud
;
903 pv_mmu_ops
.release_pud
= xen_release_pud
;
906 xen_mark_init_mm_pinned();
909 /* This is called once we have the cpu_possible_map */
910 void xen_setup_vcpu_info_placement(void)
914 for_each_possible_cpu(cpu
)
917 /* xen_vcpu_setup managed to place the vcpu_info within the
918 percpu area for all cpus, so make use of it */
920 if (have_vcpu_info_placement
) {
921 printk(KERN_INFO
"Xen: using vcpu_info placement\n");
923 pv_irq_ops
.save_fl
= xen_save_fl_direct
;
924 pv_irq_ops
.restore_fl
= xen_restore_fl_direct
;
925 pv_irq_ops
.irq_disable
= xen_irq_disable_direct
;
926 pv_irq_ops
.irq_enable
= xen_irq_enable_direct
;
927 pv_mmu_ops
.read_cr2
= xen_read_cr2_direct
;
932 static unsigned xen_patch(u8 type
, u16 clobbers
, void *insnbuf
,
933 unsigned long addr
, unsigned len
)
935 char *start
, *end
, *reloc
;
938 start
= end
= reloc
= NULL
;
940 #define SITE(op, x) \
941 case PARAVIRT_PATCH(op.x): \
942 if (have_vcpu_info_placement) { \
943 start = (char *)xen_##x##_direct; \
944 end = xen_##x##_direct_end; \
945 reloc = xen_##x##_direct_reloc; \
951 SITE(pv_irq_ops
, irq_enable
);
952 SITE(pv_irq_ops
, irq_disable
);
953 SITE(pv_irq_ops
, save_fl
);
954 SITE(pv_irq_ops
, restore_fl
);
955 #endif /* CONFIG_X86_32 */
959 if (start
== NULL
|| (end
-start
) > len
)
962 ret
= paravirt_patch_insns(insnbuf
, len
, start
, end
);
964 /* Note: because reloc is assigned from something that
965 appears to be an array, gcc assumes it's non-null,
966 but doesn't know its relationship with start and
968 if (reloc
> start
&& reloc
< end
) {
969 int reloc_off
= reloc
- start
;
970 long *relocp
= (long *)(insnbuf
+ reloc_off
);
971 long delta
= start
- (char *)addr
;
979 ret
= paravirt_patch_default(type
, clobbers
, insnbuf
,
987 static void xen_set_fixmap(unsigned idx
, unsigned long phys
, pgprot_t prot
)
994 case FIX_BTMAP_END
... FIX_BTMAP_BEGIN
:
995 #ifdef CONFIG_X86_F00F_BUG
1001 case FIX_KMAP_BEGIN
... FIX_KMAP_END
:
1003 case VSYSCALL_LAST_PAGE
... VSYSCALL_FIRST_PAGE
:
1005 #ifdef CONFIG_X86_LOCAL_APIC
1006 case FIX_APIC_BASE
: /* maps dummy local APIC */
1008 pte
= pfn_pte(phys
, prot
);
1012 pte
= mfn_pte(phys
, prot
);
1016 __native_set_fixmap(idx
, pte
);
1019 static const struct pv_info xen_info __initdata
= {
1020 .paravirt_enabled
= 1,
1021 .shared_kernel_pmd
= 0,
1026 static const struct pv_init_ops xen_init_ops __initdata
= {
1029 .banner
= xen_banner
,
1030 .memory_setup
= xen_memory_setup
,
1031 .arch_setup
= xen_arch_setup
,
1032 .post_allocator_init
= xen_post_allocator_init
,
1035 static const struct pv_time_ops xen_time_ops __initdata
= {
1036 .time_init
= xen_time_init
,
1038 .set_wallclock
= xen_set_wallclock
,
1039 .get_wallclock
= xen_get_wallclock
,
1040 .get_tsc_khz
= xen_tsc_khz
,
1041 .sched_clock
= xen_sched_clock
,
1044 static const struct pv_cpu_ops xen_cpu_ops __initdata
= {
1047 .set_debugreg
= xen_set_debugreg
,
1048 .get_debugreg
= xen_get_debugreg
,
1052 .read_cr0
= native_read_cr0
,
1053 .write_cr0
= xen_write_cr0
,
1055 .read_cr4
= native_read_cr4
,
1056 .read_cr4_safe
= native_read_cr4_safe
,
1057 .write_cr4
= xen_write_cr4
,
1059 .wbinvd
= native_wbinvd
,
1061 .read_msr
= native_read_msr_safe
,
1062 .write_msr
= native_write_msr_safe
,
1063 .read_tsc
= native_read_tsc
,
1064 .read_pmc
= native_read_pmc
,
1067 .irq_enable_sysexit
= xen_sysexit
,
1069 .load_tr_desc
= paravirt_nop
,
1070 .set_ldt
= xen_set_ldt
,
1071 .load_gdt
= xen_load_gdt
,
1072 .load_idt
= xen_load_idt
,
1073 .load_tls
= xen_load_tls
,
1074 #ifdef CONFIG_X86_64
1075 .load_gs_index
= xen_load_gs_index
,
1078 .store_gdt
= native_store_gdt
,
1079 .store_idt
= native_store_idt
,
1080 .store_tr
= xen_store_tr
,
1082 .write_ldt_entry
= xen_write_ldt_entry
,
1083 .write_gdt_entry
= xen_write_gdt_entry
,
1084 .write_idt_entry
= xen_write_idt_entry
,
1085 .load_sp0
= xen_load_sp0
,
1087 .set_iopl_mask
= xen_set_iopl_mask
,
1088 .io_delay
= xen_io_delay
,
1090 /* Xen takes care of %gs when switching to usermode for us */
1091 .swapgs
= paravirt_nop
,
1094 .enter
= paravirt_enter_lazy_cpu
,
1095 .leave
= xen_leave_lazy
,
1099 static void __init
__xen_init_IRQ(void)
1101 #ifdef CONFIG_X86_64
1104 /* Create identity vector->irq map */
1105 for(i
= 0; i
< NR_VECTORS
; i
++) {
1108 for_each_possible_cpu(cpu
)
1109 per_cpu(vector_irq
, cpu
)[i
] = i
;
1111 #endif /* CONFIG_X86_64 */
1116 static const struct pv_irq_ops xen_irq_ops __initdata
= {
1117 .init_IRQ
= __xen_init_IRQ
,
1118 .save_fl
= xen_save_fl
,
1119 .restore_fl
= xen_restore_fl
,
1120 .irq_disable
= xen_irq_disable
,
1121 .irq_enable
= xen_irq_enable
,
1122 .safe_halt
= xen_safe_halt
,
1124 #ifdef CONFIG_X86_64
1125 .adjust_exception_frame
= xen_adjust_exception_frame
,
1129 static const struct pv_apic_ops xen_apic_ops __initdata
= {
1130 #ifdef CONFIG_X86_LOCAL_APIC
1131 .apic_write
= xen_apic_write
,
1132 .apic_write_atomic
= xen_apic_write
,
1133 .apic_read
= xen_apic_read
,
1134 .setup_boot_clock
= paravirt_nop
,
1135 .setup_secondary_clock
= paravirt_nop
,
1136 .startup_ipi_hook
= paravirt_nop
,
1140 static const struct pv_mmu_ops xen_mmu_ops __initdata
= {
1141 .pagetable_setup_start
= xen_pagetable_setup_start
,
1142 .pagetable_setup_done
= xen_pagetable_setup_done
,
1144 .read_cr2
= xen_read_cr2
,
1145 .write_cr2
= xen_write_cr2
,
1147 .read_cr3
= xen_read_cr3
,
1148 .write_cr3
= xen_write_cr3
,
1150 .flush_tlb_user
= xen_flush_tlb
,
1151 .flush_tlb_kernel
= xen_flush_tlb
,
1152 .flush_tlb_single
= xen_flush_tlb_single
,
1153 .flush_tlb_others
= xen_flush_tlb_others
,
1155 .pte_update
= paravirt_nop
,
1156 .pte_update_defer
= paravirt_nop
,
1158 .pgd_alloc
= __paravirt_pgd_alloc
,
1159 .pgd_free
= paravirt_nop
,
1161 .alloc_pte
= xen_alloc_pte_init
,
1162 .release_pte
= xen_release_pte_init
,
1163 .alloc_pmd
= xen_alloc_pte_init
,
1164 .alloc_pmd_clone
= paravirt_nop
,
1165 .release_pmd
= xen_release_pte_init
,
1167 #ifdef CONFIG_HIGHPTE
1168 .kmap_atomic_pte
= xen_kmap_atomic_pte
,
1171 #ifdef CONFIG_X86_64
1172 .set_pte
= xen_set_pte
,
1174 .set_pte
= xen_set_pte_init
,
1176 .set_pte_at
= xen_set_pte_at
,
1177 .set_pmd
= xen_set_pmd_hyper
,
1179 .ptep_modify_prot_start
= __ptep_modify_prot_start
,
1180 .ptep_modify_prot_commit
= __ptep_modify_prot_commit
,
1182 .pte_val
= xen_pte_val
,
1183 .pte_flags
= native_pte_val
,
1184 .pgd_val
= xen_pgd_val
,
1186 .make_pte
= xen_make_pte
,
1187 .make_pgd
= xen_make_pgd
,
1189 #ifdef CONFIG_X86_PAE
1190 .set_pte_atomic
= xen_set_pte_atomic
,
1191 .set_pte_present
= xen_set_pte_at
,
1192 .pte_clear
= xen_pte_clear
,
1193 .pmd_clear
= xen_pmd_clear
,
1194 #endif /* CONFIG_X86_PAE */
1195 .set_pud
= xen_set_pud_hyper
,
1197 .make_pmd
= xen_make_pmd
,
1198 .pmd_val
= xen_pmd_val
,
1200 #if PAGETABLE_LEVELS == 4
1201 .pud_val
= xen_pud_val
,
1202 .make_pud
= xen_make_pud
,
1203 .set_pgd
= xen_set_pgd_hyper
,
1205 .alloc_pud
= xen_alloc_pte_init
,
1206 .release_pud
= xen_release_pte_init
,
1207 #endif /* PAGETABLE_LEVELS == 4 */
1209 .activate_mm
= xen_activate_mm
,
1210 .dup_mmap
= xen_dup_mmap
,
1211 .exit_mmap
= xen_exit_mmap
,
1214 .enter
= paravirt_enter_lazy_mmu
,
1215 .leave
= xen_leave_lazy
,
1218 .set_fixmap
= xen_set_fixmap
,
1221 static void xen_reboot(int reason
)
1223 struct sched_shutdown r
= { .reason
= reason
};
1229 if (HYPERVISOR_sched_op(SCHEDOP_shutdown
, &r
))
1233 static void xen_restart(char *msg
)
1235 xen_reboot(SHUTDOWN_reboot
);
1238 static void xen_emergency_restart(void)
1240 xen_reboot(SHUTDOWN_reboot
);
1243 static void xen_machine_halt(void)
1245 xen_reboot(SHUTDOWN_poweroff
);
1248 static void xen_crash_shutdown(struct pt_regs
*regs
)
1250 xen_reboot(SHUTDOWN_crash
);
1253 static const struct machine_ops __initdata xen_machine_ops
= {
1254 .restart
= xen_restart
,
1255 .halt
= xen_machine_halt
,
1256 .power_off
= xen_machine_halt
,
1257 .shutdown
= xen_machine_halt
,
1258 .crash_shutdown
= xen_crash_shutdown
,
1259 .emergency_restart
= xen_emergency_restart
,
1263 static void __init
xen_reserve_top(void)
1265 #ifdef CONFIG_X86_32
1266 unsigned long top
= HYPERVISOR_VIRT_START
;
1267 struct xen_platform_parameters pp
;
1269 if (HYPERVISOR_xen_version(XENVER_platform_parameters
, &pp
) == 0)
1270 top
= pp
.virt_start
;
1272 reserve_top_address(-top
+ 2 * PAGE_SIZE
);
1273 #endif /* CONFIG_X86_32 */
1277 * Like __va(), but returns address in the kernel mapping (which is
1278 * all we have until the physical memory mapping has been set up.
1280 static void *__ka(phys_addr_t paddr
)
1282 #ifdef CONFIG_X86_64
1283 return (void *)(paddr
+ __START_KERNEL_map
);
1289 /* Convert a machine address to physical address */
1290 static unsigned long m2p(phys_addr_t maddr
)
1295 paddr
= mfn_to_pfn(maddr
>> PAGE_SHIFT
) << PAGE_SHIFT
;
1300 /* Convert a machine address to kernel virtual */
1301 static void *m2v(phys_addr_t maddr
)
1303 return __ka(m2p(maddr
));
1306 #ifdef CONFIG_X86_64
1307 static void walk(pgd_t
*pgd
, unsigned long addr
)
1309 unsigned l4idx
= pgd_index(addr
);
1310 unsigned l3idx
= pud_index(addr
);
1311 unsigned l2idx
= pmd_index(addr
);
1312 unsigned l1idx
= pte_index(addr
);
1318 xen_raw_printk("walk %p, %lx -> %d %d %d %d\n",
1319 pgd
, addr
, l4idx
, l3idx
, l2idx
, l1idx
);
1322 xen_raw_printk(" l4: %016lx\n", l4
.pgd
);
1323 xen_raw_printk(" %016lx\n", pgd_val(l4
));
1325 l3
= ((pud_t
*)(m2v(l4
.pgd
)))[l3idx
];
1326 xen_raw_printk(" l3: %016lx\n", l3
.pud
);
1327 xen_raw_printk(" %016lx\n", pud_val(l3
));
1329 l2
= ((pmd_t
*)(m2v(l3
.pud
)))[l2idx
];
1330 xen_raw_printk(" l2: %016lx\n", l2
.pmd
);
1331 xen_raw_printk(" %016lx\n", pmd_val(l2
));
1333 l1
= ((pte_t
*)(m2v(l2
.pmd
)))[l1idx
];
1334 xen_raw_printk(" l1: %016lx\n", l1
.pte
);
1335 xen_raw_printk(" %016lx\n", pte_val(l1
));
1339 static void set_page_prot(void *addr
, pgprot_t prot
)
1341 unsigned long pfn
= __pa(addr
) >> PAGE_SHIFT
;
1342 pte_t pte
= pfn_pte(pfn
, prot
);
1344 xen_raw_printk("addr=%p pfn=%lx mfn=%lx prot=%016llx pte=%016llx\n",
1345 addr
, pfn
, get_phys_to_machine(pfn
),
1346 pgprot_val(prot
), pte
.pte
);
1348 if (HYPERVISOR_update_va_mapping((unsigned long)addr
, pte
, 0))
1353 * Identity map, in addition to plain kernel map. This needs to be
1354 * large enough to allocate page table pages to allocate the rest.
1355 * Each page can map 2MB.
1357 static pte_t level1_ident_pgt
[PTRS_PER_PTE
* 4] __page_aligned_bss
;
1359 static __init
void xen_map_identity_early(pmd_t
*pmd
, unsigned long max_pfn
)
1361 unsigned pmdidx
, pteidx
;
1367 for(pmdidx
= 0; pmdidx
< PTRS_PER_PMD
&& pfn
< max_pfn
; pmdidx
++) {
1370 /* Reuse or allocate a page of ptes */
1371 if (pmd_present(pmd
[pmdidx
]))
1372 pte_page
= m2v(pmd
[pmdidx
].pmd
);
1374 /* Check for free pte pages */
1375 if (ident_pte
== ARRAY_SIZE(level1_ident_pgt
))
1378 pte_page
= &level1_ident_pgt
[ident_pte
];
1379 ident_pte
+= PTRS_PER_PTE
;
1381 pmd
[pmdidx
] = __pmd(__pa(pte_page
) | _PAGE_TABLE
);
1384 /* Install mappings */
1385 for(pteidx
= 0; pteidx
< PTRS_PER_PTE
; pteidx
++, pfn
++) {
1388 if (pfn
> max_pfn_mapped
)
1389 max_pfn_mapped
= pfn
;
1391 if (!pte_none(pte_page
[pteidx
]))
1394 pte
= pfn_pte(pfn
, PAGE_KERNEL_EXEC
);
1395 pte_page
[pteidx
] = pte
;
1399 for(pteidx
= 0; pteidx
< ident_pte
; pteidx
+= PTRS_PER_PTE
)
1400 set_page_prot(&level1_ident_pgt
[pteidx
], PAGE_KERNEL_RO
);
1402 set_page_prot(pmd
, PAGE_KERNEL_RO
);
1405 #ifdef CONFIG_X86_64
1406 static void convert_pfn_mfn(void *v
)
1411 /* All levels are converted the same way, so just treat them
1413 for(i
= 0; i
< PTRS_PER_PTE
; i
++)
1414 pte
[i
] = xen_make_pte(pte
[i
].pte
);
1418 * Set up the inital kernel pagetable.
1420 * We can construct this by grafting the Xen provided pagetable into
1421 * head_64.S's preconstructed pagetables. We copy the Xen L2's into
1422 * level2_ident_pgt, level2_kernel_pgt and level2_fixmap_pgt. This
1423 * means that only the kernel has a physical mapping to start with -
1424 * but that's enough to get __va working. We need to fill in the rest
1425 * of the physical mapping once some sort of allocator has been set
1428 static __init pgd_t
*xen_setup_kernel_pagetable(pgd_t
*pgd
, unsigned long max_pfn
)
1433 /* Zap identity mapping */
1434 init_level4_pgt
[0] = __pgd(0);
1436 /* Pre-constructed entries are in pfn, so convert to mfn */
1437 convert_pfn_mfn(init_level4_pgt
);
1438 convert_pfn_mfn(level3_ident_pgt
);
1439 convert_pfn_mfn(level3_kernel_pgt
);
1441 l3
= m2v(pgd
[pgd_index(__START_KERNEL_map
)].pgd
);
1442 l2
= m2v(l3
[pud_index(__START_KERNEL_map
)].pud
);
1444 memcpy(level2_ident_pgt
, l2
, sizeof(pmd_t
) * PTRS_PER_PMD
);
1445 memcpy(level2_kernel_pgt
, l2
, sizeof(pmd_t
) * PTRS_PER_PMD
);
1447 l3
= m2v(pgd
[pgd_index(__START_KERNEL_map
+ PMD_SIZE
)].pgd
);
1448 l2
= m2v(l3
[pud_index(__START_KERNEL_map
+ PMD_SIZE
)].pud
);
1449 memcpy(level2_fixmap_pgt
, l2
, sizeof(pmd_t
) * PTRS_PER_PMD
);
1451 /* Set up identity map */
1452 xen_map_identity_early(level2_ident_pgt
, max_pfn
);
1454 /* Make pagetable pieces RO */
1455 set_page_prot(init_level4_pgt
, PAGE_KERNEL_RO
);
1456 set_page_prot(level3_ident_pgt
, PAGE_KERNEL_RO
);
1457 set_page_prot(level3_kernel_pgt
, PAGE_KERNEL_RO
);
1458 set_page_prot(level2_kernel_pgt
, PAGE_KERNEL_RO
);
1459 set_page_prot(level2_fixmap_pgt
, PAGE_KERNEL_RO
);
1461 /* Pin down new L4 */
1462 pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE
,
1463 PFN_DOWN(__pa_symbol(init_level4_pgt
)));
1465 /* Unpin Xen-provided one */
1466 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE
, PFN_DOWN(__pa(pgd
)));
1469 pgd
= init_level4_pgt
;
1470 xen_write_cr3(__pa(pgd
));
1472 reserve_early(__pa(xen_start_info
->pt_base
),
1473 __pa(xen_start_info
->pt_base
+
1474 xen_start_info
->nr_pt_frames
* PAGE_SIZE
),
1479 #else /* !CONFIG_X86_64 */
1480 static pmd_t level2_kernel_pgt
[PTRS_PER_PMD
] __page_aligned_bss
;
1482 static __init pgd_t
*xen_setup_kernel_pagetable(pgd_t
*pgd
, unsigned long max_pfn
)
1486 init_pg_tables_start
= __pa(pgd
);
1487 init_pg_tables_end
= __pa(pgd
) + xen_start_info
->nr_pt_frames
*PAGE_SIZE
;
1488 max_pfn_mapped
= PFN_DOWN(init_pg_tables_end
+ 512*1024);
1490 kernel_pmd
= m2v(pgd
[KERNEL_PGD_BOUNDARY
].pgd
);
1491 memcpy(level2_kernel_pgt
, kernel_pmd
, sizeof(pmd_t
) * PTRS_PER_PMD
);
1493 xen_map_identity_early(level2_kernel_pgt
, max_pfn
);
1495 memcpy(swapper_pg_dir
, pgd
, sizeof(pgd_t
) * PTRS_PER_PGD
);
1496 set_pgd(&swapper_pg_dir
[KERNEL_PGD_BOUNDARY
],
1497 __pgd(__pa(level2_kernel_pgt
) | _PAGE_PRESENT
));
1499 set_page_prot(level2_kernel_pgt
, PAGE_KERNEL_RO
);
1500 set_page_prot(swapper_pg_dir
, PAGE_KERNEL_RO
);
1501 set_page_prot(empty_zero_page
, PAGE_KERNEL_RO
);
1503 pin_pagetable_pfn(MMUEXT_UNPIN_TABLE
, PFN_DOWN(__pa(pgd
)));
1505 xen_write_cr3(__pa(swapper_pg_dir
));
1507 pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE
, PFN_DOWN(__pa(swapper_pg_dir
)));
1509 return swapper_pg_dir
;
1511 #endif /* CONFIG_X86_64 */
1513 /* First C function to be called on Xen boot */
1514 asmlinkage
void __init
xen_start_kernel(void)
1518 if (!xen_start_info
)
1521 BUG_ON(memcmp(xen_start_info
->magic
, "xen-3", 5) != 0);
1523 xen_setup_features();
1525 /* Install Xen paravirt ops */
1527 pv_init_ops
= xen_init_ops
;
1528 pv_time_ops
= xen_time_ops
;
1529 pv_cpu_ops
= xen_cpu_ops
;
1530 pv_irq_ops
= xen_irq_ops
;
1531 pv_apic_ops
= xen_apic_ops
;
1532 pv_mmu_ops
= xen_mmu_ops
;
1534 if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad
)) {
1535 pv_mmu_ops
.ptep_modify_prot_start
= xen_ptep_modify_prot_start
;
1536 pv_mmu_ops
.ptep_modify_prot_commit
= xen_ptep_modify_prot_commit
;
1539 machine_ops
= xen_machine_ops
;
1541 #ifdef CONFIG_X86_64
1542 /* Disable until direct per-cpu data access. */
1543 have_vcpu_info_placement
= 0;
1550 if (!xen_feature(XENFEAT_auto_translated_physmap
))
1551 xen_build_dynamic_phys_to_machine();
1553 pgd
= (pgd_t
*)xen_start_info
->pt_base
;
1555 /* Prevent unwanted bits from being set in PTEs. */
1556 __supported_pte_mask
&= ~_PAGE_GLOBAL
;
1557 if (!is_initial_xendomain())
1558 __supported_pte_mask
&= ~(_PAGE_PWT
| _PAGE_PCD
);
1560 /* Don't do the full vcpu_info placement stuff until we have a
1561 possible map and a non-dummy shared_info. */
1562 per_cpu(xen_vcpu
, 0) = &HYPERVISOR_shared_info
->vcpu_info
[0];
1564 xen_raw_console_write("mapping kernel into physical memory\n");
1565 pgd
= xen_setup_kernel_pagetable(pgd
, xen_start_info
->nr_pages
);
1569 /* keep using Xen gdt for now; no urgent need to change it */
1571 pv_info
.kernel_rpl
= 1;
1572 if (xen_feature(XENFEAT_supervisor_mode_kernel
))
1573 pv_info
.kernel_rpl
= 0;
1575 /* set the limit of our address space */
1578 #ifdef CONFIG_X86_32
1579 /* set up basic CPUID stuff */
1580 cpu_detect(&new_cpu_data
);
1581 new_cpu_data
.hard_math
= 1;
1582 new_cpu_data
.x86_capability
[0] = cpuid_edx(1);
1585 /* Poke various useful things into boot_params */
1586 boot_params
.hdr
.type_of_loader
= (9 << 4) | 0;
1587 boot_params
.hdr
.ramdisk_image
= xen_start_info
->mod_start
1588 ? __pa(xen_start_info
->mod_start
) : 0;
1589 boot_params
.hdr
.ramdisk_size
= xen_start_info
->mod_len
;
1591 if (!is_initial_xendomain()) {
1592 add_preferred_console("xenboot", 0, NULL
);
1593 add_preferred_console("tty", 0, NULL
);
1594 add_preferred_console("hvc", 0, NULL
);
1597 xen_raw_console_write("about to get started...\n");
1600 xen_raw_printk("&boot_params=%p __pa(&boot_params)=%lx __va(__pa(&boot_params))=%lx\n",
1601 &boot_params
, __pa_symbol(&boot_params
),
1602 __va(__pa_symbol(&boot_params
)));
1604 walk(pgd
, &boot_params
);
1605 walk(pgd
, __va(__pa(&boot_params
)));
1608 /* Start the world */
1609 #ifdef CONFIG_X86_32
1610 i386_start_kernel();
1612 x86_64_start_reservations((char *)__pa_symbol(&boot_params
));