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/version.h>
32 #include <xen/interface/physdev.h>
33 #include <xen/interface/vcpu.h>
34 #include <xen/features.h>
36 #include <xen/hvc-console.h>
38 #include <asm/paravirt.h>
41 #include <asm/xen/hypercall.h>
42 #include <asm/xen/hypervisor.h>
43 #include <asm/fixmap.h>
44 #include <asm/processor.h>
45 #include <asm/msr-index.h>
46 #include <asm/setup.h>
48 #include <asm/pgtable.h>
49 #include <asm/tlbflush.h>
50 #include <asm/reboot.h>
54 #include "multicalls.h"
56 EXPORT_SYMBOL_GPL(hypercall_page);
58 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
59 DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
61 enum xen_domain_type xen_domain_type = XEN_NATIVE;
62 EXPORT_SYMBOL_GPL(xen_domain_type);
64 struct start_info *xen_start_info;
65 EXPORT_SYMBOL_GPL(xen_start_info);
67 struct shared_info xen_dummy_shared_info;
70 * Point at some empty memory to start with. We map the real shared_info
71 * page as soon as fixmap is up and running.
73 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
76 * Flag to determine whether vcpu info placement is available on all
77 * VCPUs. We assume it is to start with, and then set it to zero on
78 * the first failure. This is because it can succeed on some VCPUs
79 * and not others, since it can involve hypervisor memory allocation,
80 * or because the guest failed to guarantee all the appropriate
81 * constraints on all VCPUs (ie buffer can't cross a page boundary).
83 * Note that any particular CPU may be using a placed vcpu structure,
84 * but we can only optimise if the all are.
86 * 0: not available, 1: available
88 static int have_vcpu_info_placement =
97 static void xen_vcpu_setup(int cpu)
99 struct vcpu_register_vcpu_info info;
101 struct vcpu_info *vcpup;
103 BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
104 per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
106 if (!have_vcpu_info_placement)
107 return; /* already tested, not available */
109 vcpup = &per_cpu(xen_vcpu_info, cpu);
111 info.mfn = virt_to_mfn(vcpup);
112 info.offset = offset_in_page(vcpup);
114 printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
115 cpu, vcpup, info.mfn, info.offset);
117 /* Check to see if the hypervisor will put the vcpu_info
118 structure where we want it, which allows direct access via
119 a percpu-variable. */
120 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
123 printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
124 have_vcpu_info_placement = 0;
126 /* This cpu is using the registered vcpu info, even if
127 later ones fail to. */
128 per_cpu(xen_vcpu, cpu) = vcpup;
130 printk(KERN_DEBUG "cpu %d using vcpu_info at %p\n",
136 * On restore, set the vcpu placement up again.
137 * If it fails, then we're in a bad state, since
138 * we can't back out from using it...
140 void xen_vcpu_restore(void)
142 if (have_vcpu_info_placement) {
145 for_each_online_cpu(cpu) {
146 bool other_cpu = (cpu != smp_processor_id());
149 HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL))
155 HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
159 BUG_ON(!have_vcpu_info_placement);
163 static void __init xen_banner(void)
165 unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
166 struct xen_extraversion extra;
167 HYPERVISOR_xen_version(XENVER_extraversion, &extra);
169 printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
171 printk(KERN_INFO "Xen version: %d.%d%s%s\n",
172 version >> 16, version & 0xffff, extra.extraversion,
173 xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
176 static void xen_cpuid(unsigned int *ax, unsigned int *bx,
177 unsigned int *cx, unsigned int *dx)
179 unsigned maskedx = ~0;
182 * Mask out inconvenient features, to try and disable as many
183 * unsupported kernel subsystems as possible.
186 maskedx = ~((1 << X86_FEATURE_APIC) | /* disable APIC */
187 (1 << X86_FEATURE_ACPI) | /* disable ACPI */
188 (1 << X86_FEATURE_MCE) | /* disable MCE */
189 (1 << X86_FEATURE_MCA) | /* disable MCA */
190 (1 << X86_FEATURE_ACC)); /* thermal monitoring */
192 asm(XEN_EMULATE_PREFIX "cpuid"
197 : "0" (*ax), "2" (*cx));
201 static void xen_set_debugreg(int reg, unsigned long val)
203 HYPERVISOR_set_debugreg(reg, val);
206 static unsigned long xen_get_debugreg(int reg)
208 return HYPERVISOR_get_debugreg(reg);
211 void xen_leave_lazy(void)
213 paravirt_leave_lazy(paravirt_get_lazy_mode());
217 static unsigned long xen_store_tr(void)
223 * Set the page permissions for a particular virtual address. If the
224 * address is a vmalloc mapping (or other non-linear mapping), then
225 * find the linear mapping of the page and also set its protections to
228 static void set_aliased_prot(void *v, pgprot_t prot)
236 ptep = lookup_address((unsigned long)v, &level);
237 BUG_ON(ptep == NULL);
239 pfn = pte_pfn(*ptep);
240 page = pfn_to_page(pfn);
242 pte = pfn_pte(pfn, prot);
244 if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
247 if (!PageHighMem(page)) {
248 void *av = __va(PFN_PHYS(pfn));
251 if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
257 static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
259 const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
262 for(i = 0; i < entries; i += entries_per_page)
263 set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
266 static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
268 const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
271 for(i = 0; i < entries; i += entries_per_page)
272 set_aliased_prot(ldt + i, PAGE_KERNEL);
275 static void xen_set_ldt(const void *addr, unsigned entries)
277 struct mmuext_op *op;
278 struct multicall_space mcs = xen_mc_entry(sizeof(*op));
281 op->cmd = MMUEXT_SET_LDT;
282 op->arg1.linear_addr = (unsigned long)addr;
283 op->arg2.nr_ents = entries;
285 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
287 xen_mc_issue(PARAVIRT_LAZY_CPU);
290 static void xen_load_gdt(const struct desc_ptr *dtr)
292 unsigned long *frames;
293 unsigned long va = dtr->address;
294 unsigned int size = dtr->size + 1;
295 unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
297 struct multicall_space mcs;
299 /* A GDT can be up to 64k in size, which corresponds to 8192
300 8-byte entries, or 16 4k pages.. */
302 BUG_ON(size > 65536);
303 BUG_ON(va & ~PAGE_MASK);
305 mcs = xen_mc_entry(sizeof(*frames) * pages);
308 for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
309 frames[f] = virt_to_mfn(va);
310 make_lowmem_page_readonly((void *)va);
313 MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
315 xen_mc_issue(PARAVIRT_LAZY_CPU);
318 static void load_TLS_descriptor(struct thread_struct *t,
319 unsigned int cpu, unsigned int i)
321 struct desc_struct *gdt = get_cpu_gdt_table(cpu);
322 xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
323 struct multicall_space mc = __xen_mc_entry(0);
325 MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
328 static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
331 * XXX sleazy hack: If we're being called in a lazy-cpu zone,
332 * it means we're in a context switch, and %gs has just been
333 * saved. This means we can zero it out to prevent faults on
334 * exit from the hypervisor if the next process has no %gs.
335 * Either way, it has been saved, and the new value will get
336 * loaded properly. This will go away as soon as Xen has been
337 * modified to not save/restore %gs for normal hypercalls.
339 * On x86_64, this hack is not used for %gs, because gs points
340 * to KERNEL_GS_BASE (and uses it for PDA references), so we
341 * must not zero %gs on x86_64
343 * For x86_64, we need to zero %fs, otherwise we may get an
344 * exception between the new %fs descriptor being loaded and
345 * %fs being effectively cleared at __switch_to().
347 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
357 load_TLS_descriptor(t, cpu, 0);
358 load_TLS_descriptor(t, cpu, 1);
359 load_TLS_descriptor(t, cpu, 2);
361 xen_mc_issue(PARAVIRT_LAZY_CPU);
365 static void xen_load_gs_index(unsigned int idx)
367 if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
372 static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
375 xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
376 u64 entry = *(u64 *)ptr;
381 if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
387 static int cvt_gate_to_trap(int vector, const gate_desc *val,
388 struct trap_info *info)
390 if (val->type != 0xf && val->type != 0xe)
393 info->vector = vector;
394 info->address = gate_offset(*val);
395 info->cs = gate_segment(*val);
396 info->flags = val->dpl;
397 /* interrupt gates clear IF */
398 if (val->type == 0xe)
404 /* Locations of each CPU's IDT */
405 static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
407 /* Set an IDT entry. If the entry is part of the current IDT, then
409 static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
411 unsigned long p = (unsigned long)&dt[entrynum];
412 unsigned long start, end;
416 start = __get_cpu_var(idt_desc).address;
417 end = start + __get_cpu_var(idt_desc).size + 1;
421 native_write_idt_entry(dt, entrynum, g);
423 if (p >= start && (p + 8) <= end) {
424 struct trap_info info[2];
428 if (cvt_gate_to_trap(entrynum, g, &info[0]))
429 if (HYPERVISOR_set_trap_table(info))
436 static void xen_convert_trap_info(const struct desc_ptr *desc,
437 struct trap_info *traps)
439 unsigned in, out, count;
441 count = (desc->size+1) / sizeof(gate_desc);
444 for (in = out = 0; in < count; in++) {
445 gate_desc *entry = (gate_desc*)(desc->address) + in;
447 if (cvt_gate_to_trap(in, entry, &traps[out]))
450 traps[out].address = 0;
453 void xen_copy_trap_info(struct trap_info *traps)
455 const struct desc_ptr *desc = &__get_cpu_var(idt_desc);
457 xen_convert_trap_info(desc, traps);
460 /* Load a new IDT into Xen. In principle this can be per-CPU, so we
461 hold a spinlock to protect the static traps[] array (static because
462 it avoids allocation, and saves stack space). */
463 static void xen_load_idt(const struct desc_ptr *desc)
465 static DEFINE_SPINLOCK(lock);
466 static struct trap_info traps[257];
470 __get_cpu_var(idt_desc) = *desc;
472 xen_convert_trap_info(desc, traps);
475 if (HYPERVISOR_set_trap_table(traps))
481 /* Write a GDT descriptor entry. Ignore LDT descriptors, since
482 they're handled differently. */
483 static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
484 const void *desc, int type)
495 xmaddr_t maddr = virt_to_machine(&dt[entry]);
498 if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
507 static void xen_load_sp0(struct tss_struct *tss,
508 struct thread_struct *thread)
510 struct multicall_space mcs = xen_mc_entry(0);
511 MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
512 xen_mc_issue(PARAVIRT_LAZY_CPU);
515 static void xen_set_iopl_mask(unsigned mask)
517 struct physdev_set_iopl set_iopl;
519 /* Force the change at ring 0. */
520 set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
521 HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
524 static void xen_io_delay(void)
528 #ifdef CONFIG_X86_LOCAL_APIC
529 static u32 xen_apic_read(u32 reg)
534 static void xen_apic_write(u32 reg, u32 val)
536 /* Warn to see if there's any stray references */
540 static u64 xen_apic_icr_read(void)
545 static void xen_apic_icr_write(u32 low, u32 id)
547 /* Warn to see if there's any stray references */
551 static void xen_apic_wait_icr_idle(void)
556 static u32 xen_safe_apic_wait_icr_idle(void)
561 static struct apic_ops xen_basic_apic_ops = {
562 .read = xen_apic_read,
563 .write = xen_apic_write,
564 .icr_read = xen_apic_icr_read,
565 .icr_write = xen_apic_icr_write,
566 .wait_icr_idle = xen_apic_wait_icr_idle,
567 .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
573 static void xen_clts(void)
575 struct multicall_space mcs;
577 mcs = xen_mc_entry(0);
579 MULTI_fpu_taskswitch(mcs.mc, 0);
581 xen_mc_issue(PARAVIRT_LAZY_CPU);
584 static void xen_write_cr0(unsigned long cr0)
586 struct multicall_space mcs;
588 /* Only pay attention to cr0.TS; everything else is
590 mcs = xen_mc_entry(0);
592 MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
594 xen_mc_issue(PARAVIRT_LAZY_CPU);
597 static void xen_write_cr4(unsigned long cr4)
602 native_write_cr4(cr4);
605 static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
616 case MSR_FS_BASE: which = SEGBASE_FS; goto set;
617 case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
618 case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
621 base = ((u64)high << 32) | low;
622 if (HYPERVISOR_set_segment_base(which, base) != 0)
630 case MSR_SYSCALL_MASK:
631 case MSR_IA32_SYSENTER_CS:
632 case MSR_IA32_SYSENTER_ESP:
633 case MSR_IA32_SYSENTER_EIP:
634 /* Fast syscall setup is all done in hypercalls, so
635 these are all ignored. Stub them out here to stop
636 Xen console noise. */
640 ret = native_write_msr_safe(msr, low, high);
646 void xen_setup_shared_info(void)
648 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
649 set_fixmap(FIX_PARAVIRT_BOOTMAP,
650 xen_start_info->shared_info);
652 HYPERVISOR_shared_info =
653 (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
655 HYPERVISOR_shared_info =
656 (struct shared_info *)__va(xen_start_info->shared_info);
659 /* In UP this is as good a place as any to set up shared info */
660 xen_setup_vcpu_info_placement();
663 xen_setup_mfn_list_list();
666 /* This is called once we have the cpu_possible_map */
667 void xen_setup_vcpu_info_placement(void)
671 for_each_possible_cpu(cpu)
674 /* xen_vcpu_setup managed to place the vcpu_info within the
675 percpu area for all cpus, so make use of it */
676 if (have_vcpu_info_placement) {
677 printk(KERN_INFO "Xen: using vcpu_info placement\n");
679 pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
680 pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
681 pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
682 pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
683 pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
687 static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
688 unsigned long addr, unsigned len)
690 char *start, *end, *reloc;
693 start = end = reloc = NULL;
695 #define SITE(op, x) \
696 case PARAVIRT_PATCH(op.x): \
697 if (have_vcpu_info_placement) { \
698 start = (char *)xen_##x##_direct; \
699 end = xen_##x##_direct_end; \
700 reloc = xen_##x##_direct_reloc; \
705 SITE(pv_irq_ops, irq_enable);
706 SITE(pv_irq_ops, irq_disable);
707 SITE(pv_irq_ops, save_fl);
708 SITE(pv_irq_ops, restore_fl);
712 if (start == NULL || (end-start) > len)
715 ret = paravirt_patch_insns(insnbuf, len, start, end);
717 /* Note: because reloc is assigned from something that
718 appears to be an array, gcc assumes it's non-null,
719 but doesn't know its relationship with start and
721 if (reloc > start && reloc < end) {
722 int reloc_off = reloc - start;
723 long *relocp = (long *)(insnbuf + reloc_off);
724 long delta = start - (char *)addr;
732 ret = paravirt_patch_default(type, clobbers, insnbuf,
740 static const struct pv_info xen_info __initdata = {
741 .paravirt_enabled = 1,
742 .shared_kernel_pmd = 0,
747 static const struct pv_init_ops xen_init_ops __initdata = {
750 .banner = xen_banner,
751 .memory_setup = xen_memory_setup,
752 .arch_setup = xen_arch_setup,
753 .post_allocator_init = xen_post_allocator_init,
756 static const struct pv_time_ops xen_time_ops __initdata = {
757 .time_init = xen_time_init,
759 .set_wallclock = xen_set_wallclock,
760 .get_wallclock = xen_get_wallclock,
761 .get_tsc_khz = xen_tsc_khz,
762 .sched_clock = xen_sched_clock,
765 static const struct pv_cpu_ops xen_cpu_ops __initdata = {
768 .set_debugreg = xen_set_debugreg,
769 .get_debugreg = xen_get_debugreg,
773 .read_cr0 = native_read_cr0,
774 .write_cr0 = xen_write_cr0,
776 .read_cr4 = native_read_cr4,
777 .read_cr4_safe = native_read_cr4_safe,
778 .write_cr4 = xen_write_cr4,
780 .wbinvd = native_wbinvd,
782 .read_msr = native_read_msr_safe,
783 .write_msr = xen_write_msr_safe,
784 .read_tsc = native_read_tsc,
785 .read_pmc = native_read_pmc,
788 .irq_enable_sysexit = xen_sysexit,
790 .usergs_sysret32 = xen_sysret32,
791 .usergs_sysret64 = xen_sysret64,
794 .load_tr_desc = paravirt_nop,
795 .set_ldt = xen_set_ldt,
796 .load_gdt = xen_load_gdt,
797 .load_idt = xen_load_idt,
798 .load_tls = xen_load_tls,
800 .load_gs_index = xen_load_gs_index,
803 .alloc_ldt = xen_alloc_ldt,
804 .free_ldt = xen_free_ldt,
806 .store_gdt = native_store_gdt,
807 .store_idt = native_store_idt,
808 .store_tr = xen_store_tr,
810 .write_ldt_entry = xen_write_ldt_entry,
811 .write_gdt_entry = xen_write_gdt_entry,
812 .write_idt_entry = xen_write_idt_entry,
813 .load_sp0 = xen_load_sp0,
815 .set_iopl_mask = xen_set_iopl_mask,
816 .io_delay = xen_io_delay,
818 /* Xen takes care of %gs when switching to usermode for us */
819 .swapgs = paravirt_nop,
822 .enter = paravirt_enter_lazy_cpu,
823 .leave = xen_leave_lazy,
827 static const struct pv_apic_ops xen_apic_ops __initdata = {
828 #ifdef CONFIG_X86_LOCAL_APIC
829 .setup_boot_clock = paravirt_nop,
830 .setup_secondary_clock = paravirt_nop,
831 .startup_ipi_hook = paravirt_nop,
835 static void xen_reboot(int reason)
837 struct sched_shutdown r = { .reason = reason };
843 if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
847 static void xen_restart(char *msg)
849 xen_reboot(SHUTDOWN_reboot);
852 static void xen_emergency_restart(void)
854 xen_reboot(SHUTDOWN_reboot);
857 static void xen_machine_halt(void)
859 xen_reboot(SHUTDOWN_poweroff);
862 static void xen_crash_shutdown(struct pt_regs *regs)
864 xen_reboot(SHUTDOWN_crash);
867 static const struct machine_ops __initdata xen_machine_ops = {
868 .restart = xen_restart,
869 .halt = xen_machine_halt,
870 .power_off = xen_machine_halt,
871 .shutdown = xen_machine_halt,
872 .crash_shutdown = xen_crash_shutdown,
873 .emergency_restart = xen_emergency_restart,
877 /* First C function to be called on Xen boot */
878 asmlinkage void __init xen_start_kernel(void)
885 xen_domain_type = XEN_PV_DOMAIN;
887 BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);
889 xen_setup_features();
891 /* Install Xen paravirt ops */
893 pv_init_ops = xen_init_ops;
894 pv_time_ops = xen_time_ops;
895 pv_cpu_ops = xen_cpu_ops;
896 pv_apic_ops = xen_apic_ops;
897 pv_mmu_ops = xen_mmu_ops;
901 #ifdef CONFIG_X86_LOCAL_APIC
903 * set up the basic apic ops.
905 apic_ops = &xen_basic_apic_ops;
908 if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
909 pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
910 pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
913 machine_ops = xen_machine_ops;
916 /* Disable until direct per-cpu data access. */
917 have_vcpu_info_placement = 0;
920 /* setup percpu state */
921 load_percpu_segment(0);
926 if (!xen_feature(XENFEAT_auto_translated_physmap))
927 xen_build_dynamic_phys_to_machine();
929 pgd = (pgd_t *)xen_start_info->pt_base;
931 /* Prevent unwanted bits from being set in PTEs. */
932 __supported_pte_mask &= ~_PAGE_GLOBAL;
933 if (!xen_initial_domain())
934 __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
936 /* Don't do the full vcpu_info placement stuff until we have a
937 possible map and a non-dummy shared_info. */
938 per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
940 xen_raw_console_write("mapping kernel into physical memory\n");
941 pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
945 /* keep using Xen gdt for now; no urgent need to change it */
947 pv_info.kernel_rpl = 1;
948 if (xen_feature(XENFEAT_supervisor_mode_kernel))
949 pv_info.kernel_rpl = 0;
951 /* set the limit of our address space */
955 /* set up basic CPUID stuff */
956 cpu_detect(&new_cpu_data);
957 new_cpu_data.hard_math = 1;
958 new_cpu_data.x86_capability[0] = cpuid_edx(1);
961 /* Poke various useful things into boot_params */
962 boot_params.hdr.type_of_loader = (9 << 4) | 0;
963 boot_params.hdr.ramdisk_image = xen_start_info->mod_start
964 ? __pa(xen_start_info->mod_start) : 0;
965 boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
966 boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
968 if (!xen_initial_domain()) {
969 add_preferred_console("xenboot", 0, NULL);
970 add_preferred_console("tty", 0, NULL);
971 add_preferred_console("hvc", 0, NULL);
974 xen_raw_console_write("about to get started...\n");
976 /* Start the world */
980 x86_64_start_reservations((char *)__pa_symbol(&boot_params));