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/cpu.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/smp.h>
18 #include <linux/preempt.h>
19 #include <linux/hardirq.h>
20 #include <linux/percpu.h>
21 #include <linux/delay.h>
22 #include <linux/start_kernel.h>
23 #include <linux/sched.h>
24 #include <linux/kprobes.h>
25 #include <linux/bootmem.h>
26 #include <linux/module.h>
28 #include <linux/page-flags.h>
29 #include <linux/highmem.h>
30 #include <linux/console.h>
31 #include <linux/pci.h>
32 #include <linux/gfp.h>
33 #include <linux/memblock.h>
34 #include <linux/edd.h>
37 #include <xen/events.h>
38 #include <xen/interface/xen.h>
39 #include <xen/interface/version.h>
40 #include <xen/interface/physdev.h>
41 #include <xen/interface/vcpu.h>
42 #include <xen/interface/memory.h>
43 #include <xen/interface/nmi.h>
44 #include <xen/interface/xen-mca.h>
45 #include <xen/features.h>
48 #include <xen/hvc-console.h>
51 #include <asm/paravirt.h>
54 #include <asm/xen/pci.h>
55 #include <asm/xen/hypercall.h>
56 #include <asm/xen/hypervisor.h>
57 #include <asm/fixmap.h>
58 #include <asm/processor.h>
59 #include <asm/proto.h>
60 #include <asm/msr-index.h>
61 #include <asm/traps.h>
62 #include <asm/setup.h>
64 #include <asm/pgalloc.h>
65 #include <asm/pgtable.h>
66 #include <asm/tlbflush.h>
67 #include <asm/reboot.h>
68 #include <asm/stackprotector.h>
69 #include <asm/hypervisor.h>
70 #include <asm/mach_traps.h>
71 #include <asm/mwait.h>
72 #include <asm/pci_x86.h>
76 #include <linux/acpi.h>
78 #include <acpi/pdc_intel.h>
79 #include <acpi/processor.h>
80 #include <xen/interface/platform.h>
86 #include "multicalls.h"
88 EXPORT_SYMBOL_GPL(hypercall_page);
91 * Pointer to the xen_vcpu_info structure or
92 * &HYPERVISOR_shared_info->vcpu_info[cpu]. See xen_hvm_init_shared_info
93 * and xen_vcpu_setup for details. By default it points to share_info->vcpu_info
94 * but if the hypervisor supports VCPUOP_register_vcpu_info then it can point
95 * to xen_vcpu_info. The pointer is used in __xen_evtchn_do_upcall to
96 * acknowledge pending events.
97 * Also more subtly it is used by the patched version of irq enable/disable
98 * e.g. xen_irq_enable_direct and xen_iret in PV mode.
100 * The desire to be able to do those mask/unmask operations as a single
101 * instruction by using the per-cpu offset held in %gs is the real reason
102 * vcpu info is in a per-cpu pointer and the original reason for this
106 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
109 * Per CPU pages used if hypervisor supports VCPUOP_register_vcpu_info
110 * hypercall. This can be used both in PV and PVHVM mode. The structure
111 * overrides the default per_cpu(xen_vcpu, cpu) value.
113 DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
115 enum xen_domain_type xen_domain_type = XEN_NATIVE;
116 EXPORT_SYMBOL_GPL(xen_domain_type);
118 unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START;
119 EXPORT_SYMBOL(machine_to_phys_mapping);
120 unsigned long machine_to_phys_nr;
121 EXPORT_SYMBOL(machine_to_phys_nr);
123 struct start_info *xen_start_info;
124 EXPORT_SYMBOL_GPL(xen_start_info);
126 struct shared_info xen_dummy_shared_info;
128 void *xen_initial_gdt;
130 RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
131 __read_mostly int xen_have_vector_callback;
132 EXPORT_SYMBOL_GPL(xen_have_vector_callback);
135 * Point at some empty memory to start with. We map the real shared_info
136 * page as soon as fixmap is up and running.
138 struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
141 * Flag to determine whether vcpu info placement is available on all
142 * VCPUs. We assume it is to start with, and then set it to zero on
143 * the first failure. This is because it can succeed on some VCPUs
144 * and not others, since it can involve hypervisor memory allocation,
145 * or because the guest failed to guarantee all the appropriate
146 * constraints on all VCPUs (ie buffer can't cross a page boundary).
148 * Note that any particular CPU may be using a placed vcpu structure,
149 * but we can only optimise if the all are.
151 * 0: not available, 1: available
153 static int have_vcpu_info_placement = 1;
156 struct desc_struct desc[3];
160 * Updating the 3 TLS descriptors in the GDT on every task switch is
161 * surprisingly expensive so we avoid updating them if they haven't
162 * changed. Since Xen writes different descriptors than the one
163 * passed in the update_descriptor hypercall we keep shadow copies to
166 static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
168 static void clamp_max_cpus(void)
171 if (setup_max_cpus > MAX_VIRT_CPUS)
172 setup_max_cpus = MAX_VIRT_CPUS;
176 static void xen_vcpu_setup(int cpu)
178 struct vcpu_register_vcpu_info info;
180 struct vcpu_info *vcpup;
182 BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
185 * This path is called twice on PVHVM - first during bootup via
186 * smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being
187 * hotplugged: cpu_up -> xen_hvm_cpu_notify.
188 * As we can only do the VCPUOP_register_vcpu_info once lets
189 * not over-write its result.
191 * For PV it is called during restore (xen_vcpu_restore) and bootup
192 * (xen_setup_vcpu_info_placement). The hotplug mechanism does not
195 if (xen_hvm_domain()) {
196 if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu))
199 if (cpu < MAX_VIRT_CPUS)
200 per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
202 if (!have_vcpu_info_placement) {
203 if (cpu >= MAX_VIRT_CPUS)
208 vcpup = &per_cpu(xen_vcpu_info, cpu);
209 info.mfn = arbitrary_virt_to_mfn(vcpup);
210 info.offset = offset_in_page(vcpup);
212 /* Check to see if the hypervisor will put the vcpu_info
213 structure where we want it, which allows direct access via
215 N.B. This hypercall can _only_ be called once per CPU. Subsequent
216 calls will error out with -EINVAL. This is due to the fact that
217 hypervisor has no unregister variant and this hypercall does not
218 allow to over-write info.mfn and info.offset.
220 err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
223 printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
224 have_vcpu_info_placement = 0;
227 /* This cpu is using the registered vcpu info, even if
228 later ones fail to. */
229 per_cpu(xen_vcpu, cpu) = vcpup;
234 * On restore, set the vcpu placement up again.
235 * If it fails, then we're in a bad state, since
236 * we can't back out from using it...
238 void xen_vcpu_restore(void)
242 for_each_possible_cpu(cpu) {
243 bool other_cpu = (cpu != smp_processor_id());
244 bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL);
246 if (other_cpu && is_up &&
247 HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL))
250 xen_setup_runstate_info(cpu);
252 if (have_vcpu_info_placement)
255 if (other_cpu && is_up &&
256 HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL))
261 static void __init xen_banner(void)
263 unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
264 struct xen_extraversion extra;
265 HYPERVISOR_xen_version(XENVER_extraversion, &extra);
267 pr_info("Booting paravirtualized kernel %son %s\n",
268 xen_feature(XENFEAT_auto_translated_physmap) ?
269 "with PVH extensions " : "", pv_info.name);
270 printk(KERN_INFO "Xen version: %d.%d%s%s\n",
271 version >> 16, version & 0xffff, extra.extraversion,
272 xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
274 /* Check if running on Xen version (major, minor) or later */
276 xen_running_on_version_or_later(unsigned int major, unsigned int minor)
278 unsigned int version;
283 version = HYPERVISOR_xen_version(XENVER_version, NULL);
284 if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) ||
285 ((version >> 16) > major))
290 #define CPUID_THERM_POWER_LEAF 6
291 #define APERFMPERF_PRESENT 0
293 static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
294 static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
296 static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask;
297 static __read_mostly unsigned int cpuid_leaf5_ecx_val;
298 static __read_mostly unsigned int cpuid_leaf5_edx_val;
300 static void xen_cpuid(unsigned int *ax, unsigned int *bx,
301 unsigned int *cx, unsigned int *dx)
303 unsigned maskebx = ~0;
304 unsigned maskecx = ~0;
305 unsigned maskedx = ~0;
308 * Mask out inconvenient features, to try and disable as many
309 * unsupported kernel subsystems as possible.
313 maskecx = cpuid_leaf1_ecx_mask;
314 setecx = cpuid_leaf1_ecx_set_mask;
315 maskedx = cpuid_leaf1_edx_mask;
318 case CPUID_MWAIT_LEAF:
319 /* Synthesize the values.. */
322 *cx = cpuid_leaf5_ecx_val;
323 *dx = cpuid_leaf5_edx_val;
326 case CPUID_THERM_POWER_LEAF:
327 /* Disabling APERFMPERF for kernel usage */
328 maskecx = ~(1 << APERFMPERF_PRESENT);
332 /* Suppress extended topology stuff */
337 asm(XEN_EMULATE_PREFIX "cpuid"
342 : "0" (*ax), "2" (*cx));
351 static bool __init xen_check_mwait(void)
354 struct xen_platform_op op = {
355 .cmd = XENPF_set_processor_pminfo,
356 .u.set_pminfo.id = -1,
357 .u.set_pminfo.type = XEN_PM_PDC,
360 unsigned int ax, bx, cx, dx;
361 unsigned int mwait_mask;
363 /* We need to determine whether it is OK to expose the MWAIT
364 * capability to the kernel to harvest deeper than C3 states from ACPI
365 * _CST using the processor_harvest_xen.c module. For this to work, we
366 * need to gather the MWAIT_LEAF values (which the cstate.c code
367 * checks against). The hypervisor won't expose the MWAIT flag because
368 * it would break backwards compatibility; so we will find out directly
369 * from the hardware and hypercall.
371 if (!xen_initial_domain())
375 * When running under platform earlier than Xen4.2, do not expose
376 * mwait, to avoid the risk of loading native acpi pad driver
378 if (!xen_running_on_version_or_later(4, 2))
384 native_cpuid(&ax, &bx, &cx, &dx);
386 mwait_mask = (1 << (X86_FEATURE_EST % 32)) |
387 (1 << (X86_FEATURE_MWAIT % 32));
389 if ((cx & mwait_mask) != mwait_mask)
392 /* We need to emulate the MWAIT_LEAF and for that we need both
393 * ecx and edx. The hypercall provides only partial information.
396 ax = CPUID_MWAIT_LEAF;
401 native_cpuid(&ax, &bx, &cx, &dx);
403 /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
404 * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
406 buf[0] = ACPI_PDC_REVISION_ID;
408 buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP);
410 set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
412 if ((HYPERVISOR_dom0_op(&op) == 0) &&
413 (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) {
414 cpuid_leaf5_ecx_val = cx;
415 cpuid_leaf5_edx_val = dx;
422 static void __init xen_init_cpuid_mask(void)
424 unsigned int ax, bx, cx, dx;
425 unsigned int xsave_mask;
427 cpuid_leaf1_edx_mask =
428 ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
429 (1 << X86_FEATURE_ACC)); /* thermal monitoring */
431 if (!xen_initial_domain())
432 cpuid_leaf1_edx_mask &=
433 ~((1 << X86_FEATURE_ACPI)); /* disable ACPI */
435 cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32));
439 cpuid(1, &ax, &bx, &cx, &dx);
442 (1 << (X86_FEATURE_XSAVE % 32)) |
443 (1 << (X86_FEATURE_OSXSAVE % 32));
445 /* Xen will set CR4.OSXSAVE if supported and not disabled by force */
446 if ((cx & xsave_mask) != xsave_mask)
447 cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */
448 if (xen_check_mwait())
449 cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
452 static void xen_set_debugreg(int reg, unsigned long val)
454 HYPERVISOR_set_debugreg(reg, val);
457 static unsigned long xen_get_debugreg(int reg)
459 return HYPERVISOR_get_debugreg(reg);
462 static void xen_end_context_switch(struct task_struct *next)
465 paravirt_end_context_switch(next);
468 static unsigned long xen_store_tr(void)
474 * Set the page permissions for a particular virtual address. If the
475 * address is a vmalloc mapping (or other non-linear mapping), then
476 * find the linear mapping of the page and also set its protections to
479 static void set_aliased_prot(void *v, pgprot_t prot)
487 ptep = lookup_address((unsigned long)v, &level);
488 BUG_ON(ptep == NULL);
490 pfn = pte_pfn(*ptep);
491 page = pfn_to_page(pfn);
493 pte = pfn_pte(pfn, prot);
495 if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0))
498 if (!PageHighMem(page)) {
499 void *av = __va(PFN_PHYS(pfn));
502 if (HYPERVISOR_update_va_mapping((unsigned long)av, pte, 0))
508 static void xen_alloc_ldt(struct desc_struct *ldt, unsigned entries)
510 const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
513 for(i = 0; i < entries; i += entries_per_page)
514 set_aliased_prot(ldt + i, PAGE_KERNEL_RO);
517 static void xen_free_ldt(struct desc_struct *ldt, unsigned entries)
519 const unsigned entries_per_page = PAGE_SIZE / LDT_ENTRY_SIZE;
522 for(i = 0; i < entries; i += entries_per_page)
523 set_aliased_prot(ldt + i, PAGE_KERNEL);
526 static void xen_set_ldt(const void *addr, unsigned entries)
528 struct mmuext_op *op;
529 struct multicall_space mcs = xen_mc_entry(sizeof(*op));
531 trace_xen_cpu_set_ldt(addr, entries);
534 op->cmd = MMUEXT_SET_LDT;
535 op->arg1.linear_addr = (unsigned long)addr;
536 op->arg2.nr_ents = entries;
538 MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
540 xen_mc_issue(PARAVIRT_LAZY_CPU);
543 static void xen_load_gdt(const struct desc_ptr *dtr)
545 unsigned long va = dtr->address;
546 unsigned int size = dtr->size + 1;
547 unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
548 unsigned long frames[pages];
552 * A GDT can be up to 64k in size, which corresponds to 8192
553 * 8-byte entries, or 16 4k pages..
556 BUG_ON(size > 65536);
557 BUG_ON(va & ~PAGE_MASK);
559 for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
562 unsigned long pfn, mfn;
566 * The GDT is per-cpu and is in the percpu data area.
567 * That can be virtually mapped, so we need to do a
568 * page-walk to get the underlying MFN for the
569 * hypercall. The page can also be in the kernel's
570 * linear range, so we need to RO that mapping too.
572 ptep = lookup_address(va, &level);
573 BUG_ON(ptep == NULL);
575 pfn = pte_pfn(*ptep);
576 mfn = pfn_to_mfn(pfn);
577 virt = __va(PFN_PHYS(pfn));
581 make_lowmem_page_readonly((void *)va);
582 make_lowmem_page_readonly(virt);
585 if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
590 * load_gdt for early boot, when the gdt is only mapped once
592 static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
594 unsigned long va = dtr->address;
595 unsigned int size = dtr->size + 1;
596 unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
597 unsigned long frames[pages];
601 * A GDT can be up to 64k in size, which corresponds to 8192
602 * 8-byte entries, or 16 4k pages..
605 BUG_ON(size > 65536);
606 BUG_ON(va & ~PAGE_MASK);
608 for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
610 unsigned long pfn, mfn;
612 pfn = virt_to_pfn(va);
613 mfn = pfn_to_mfn(pfn);
615 pte = pfn_pte(pfn, PAGE_KERNEL_RO);
617 if (HYPERVISOR_update_va_mapping((unsigned long)va, pte, 0))
623 if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
627 static inline bool desc_equal(const struct desc_struct *d1,
628 const struct desc_struct *d2)
630 return d1->a == d2->a && d1->b == d2->b;
633 static void load_TLS_descriptor(struct thread_struct *t,
634 unsigned int cpu, unsigned int i)
636 struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
637 struct desc_struct *gdt;
639 struct multicall_space mc;
641 if (desc_equal(shadow, &t->tls_array[i]))
644 *shadow = t->tls_array[i];
646 gdt = get_cpu_gdt_table(cpu);
647 maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
648 mc = __xen_mc_entry(0);
650 MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
653 static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
656 * XXX sleazy hack: If we're being called in a lazy-cpu zone
657 * and lazy gs handling is enabled, it means we're in a
658 * context switch, and %gs has just been saved. This means we
659 * can zero it out to prevent faults on exit from the
660 * hypervisor if the next process has no %gs. Either way, it
661 * has been saved, and the new value will get loaded properly.
662 * This will go away as soon as Xen has been modified to not
663 * save/restore %gs for normal hypercalls.
665 * On x86_64, this hack is not used for %gs, because gs points
666 * to KERNEL_GS_BASE (and uses it for PDA references), so we
667 * must not zero %gs on x86_64
669 * For x86_64, we need to zero %fs, otherwise we may get an
670 * exception between the new %fs descriptor being loaded and
671 * %fs being effectively cleared at __switch_to().
673 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
683 load_TLS_descriptor(t, cpu, 0);
684 load_TLS_descriptor(t, cpu, 1);
685 load_TLS_descriptor(t, cpu, 2);
687 xen_mc_issue(PARAVIRT_LAZY_CPU);
691 static void xen_load_gs_index(unsigned int idx)
693 if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
698 static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
701 xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
702 u64 entry = *(u64 *)ptr;
704 trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
709 if (HYPERVISOR_update_descriptor(mach_lp.maddr, entry))
715 static int cvt_gate_to_trap(int vector, const gate_desc *val,
716 struct trap_info *info)
720 if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
723 info->vector = vector;
725 addr = gate_offset(*val);
728 * Look for known traps using IST, and substitute them
729 * appropriately. The debugger ones are the only ones we care
730 * about. Xen will handle faults like double_fault,
731 * so we should never see them. Warn if
732 * there's an unexpected IST-using fault handler.
734 if (addr == (unsigned long)debug)
735 addr = (unsigned long)xen_debug;
736 else if (addr == (unsigned long)int3)
737 addr = (unsigned long)xen_int3;
738 else if (addr == (unsigned long)stack_segment)
739 addr = (unsigned long)xen_stack_segment;
740 else if (addr == (unsigned long)double_fault) {
741 /* Don't need to handle these */
743 #ifdef CONFIG_X86_MCE
744 } else if (addr == (unsigned long)machine_check) {
746 * when xen hypervisor inject vMCE to guest,
747 * use native mce handler to handle it
751 } else if (addr == (unsigned long)nmi)
753 * Use the native version as well.
757 /* Some other trap using IST? */
758 if (WARN_ON(val->ist != 0))
761 #endif /* CONFIG_X86_64 */
762 info->address = addr;
764 info->cs = gate_segment(*val);
765 info->flags = val->dpl;
766 /* interrupt gates clear IF */
767 if (val->type == GATE_INTERRUPT)
768 info->flags |= 1 << 2;
773 /* Locations of each CPU's IDT */
774 static DEFINE_PER_CPU(struct desc_ptr, idt_desc);
776 /* Set an IDT entry. If the entry is part of the current IDT, then
778 static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
780 unsigned long p = (unsigned long)&dt[entrynum];
781 unsigned long start, end;
783 trace_xen_cpu_write_idt_entry(dt, entrynum, g);
787 start = __this_cpu_read(idt_desc.address);
788 end = start + __this_cpu_read(idt_desc.size) + 1;
792 native_write_idt_entry(dt, entrynum, g);
794 if (p >= start && (p + 8) <= end) {
795 struct trap_info info[2];
799 if (cvt_gate_to_trap(entrynum, g, &info[0]))
800 if (HYPERVISOR_set_trap_table(info))
807 static void xen_convert_trap_info(const struct desc_ptr *desc,
808 struct trap_info *traps)
810 unsigned in, out, count;
812 count = (desc->size+1) / sizeof(gate_desc);
815 for (in = out = 0; in < count; in++) {
816 gate_desc *entry = (gate_desc*)(desc->address) + in;
818 if (cvt_gate_to_trap(in, entry, &traps[out]))
821 traps[out].address = 0;
824 void xen_copy_trap_info(struct trap_info *traps)
826 const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
828 xen_convert_trap_info(desc, traps);
831 /* Load a new IDT into Xen. In principle this can be per-CPU, so we
832 hold a spinlock to protect the static traps[] array (static because
833 it avoids allocation, and saves stack space). */
834 static void xen_load_idt(const struct desc_ptr *desc)
836 static DEFINE_SPINLOCK(lock);
837 static struct trap_info traps[257];
839 trace_xen_cpu_load_idt(desc);
843 memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
845 xen_convert_trap_info(desc, traps);
848 if (HYPERVISOR_set_trap_table(traps))
854 /* Write a GDT descriptor entry. Ignore LDT descriptors, since
855 they're handled differently. */
856 static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
857 const void *desc, int type)
859 trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
870 xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
873 if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
883 * Version of write_gdt_entry for use at early boot-time needed to
884 * update an entry as simply as possible.
886 static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
887 const void *desc, int type)
889 trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
898 xmaddr_t maddr = virt_to_machine(&dt[entry]);
900 if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
901 dt[entry] = *(struct desc_struct *)desc;
907 static void xen_load_sp0(struct tss_struct *tss,
908 struct thread_struct *thread)
910 struct multicall_space mcs;
912 mcs = xen_mc_entry(0);
913 MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
914 xen_mc_issue(PARAVIRT_LAZY_CPU);
915 tss->x86_tss.sp0 = thread->sp0;
918 static void xen_set_iopl_mask(unsigned mask)
920 struct physdev_set_iopl set_iopl;
922 /* Force the change at ring 0. */
923 set_iopl.iopl = (mask == 0) ? 1 : (mask >> 12) & 3;
924 HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
927 static void xen_io_delay(void)
931 #ifdef CONFIG_X86_LOCAL_APIC
932 static unsigned long xen_set_apic_id(unsigned int x)
937 static unsigned int xen_get_apic_id(unsigned long x)
939 return ((x)>>24) & 0xFFu;
941 static u32 xen_apic_read(u32 reg)
943 struct xen_platform_op op = {
944 .cmd = XENPF_get_cpuinfo,
945 .interface_version = XENPF_INTERFACE_VERSION,
946 .u.pcpu_info.xen_cpuid = 0,
950 /* Shouldn't need this as APIC is turned off for PV, and we only
951 * get called on the bootup processor. But just in case. */
952 if (!xen_initial_domain() || smp_processor_id())
961 ret = HYPERVISOR_dom0_op(&op);
965 return op.u.pcpu_info.apic_id << 24;
968 static void xen_apic_write(u32 reg, u32 val)
970 /* Warn to see if there's any stray references */
974 static u64 xen_apic_icr_read(void)
979 static void xen_apic_icr_write(u32 low, u32 id)
981 /* Warn to see if there's any stray references */
985 static void xen_apic_wait_icr_idle(void)
990 static u32 xen_safe_apic_wait_icr_idle(void)
995 static void set_xen_basic_apic_ops(void)
997 apic->read = xen_apic_read;
998 apic->write = xen_apic_write;
999 apic->icr_read = xen_apic_icr_read;
1000 apic->icr_write = xen_apic_icr_write;
1001 apic->wait_icr_idle = xen_apic_wait_icr_idle;
1002 apic->safe_wait_icr_idle = xen_safe_apic_wait_icr_idle;
1003 apic->set_apic_id = xen_set_apic_id;
1004 apic->get_apic_id = xen_get_apic_id;
1007 apic->send_IPI_allbutself = xen_send_IPI_allbutself;
1008 apic->send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself;
1009 apic->send_IPI_mask = xen_send_IPI_mask;
1010 apic->send_IPI_all = xen_send_IPI_all;
1011 apic->send_IPI_self = xen_send_IPI_self;
1017 static void xen_clts(void)
1019 struct multicall_space mcs;
1021 mcs = xen_mc_entry(0);
1023 MULTI_fpu_taskswitch(mcs.mc, 0);
1025 xen_mc_issue(PARAVIRT_LAZY_CPU);
1028 static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
1030 static unsigned long xen_read_cr0(void)
1032 unsigned long cr0 = this_cpu_read(xen_cr0_value);
1034 if (unlikely(cr0 == 0)) {
1035 cr0 = native_read_cr0();
1036 this_cpu_write(xen_cr0_value, cr0);
1042 static void xen_write_cr0(unsigned long cr0)
1044 struct multicall_space mcs;
1046 this_cpu_write(xen_cr0_value, cr0);
1048 /* Only pay attention to cr0.TS; everything else is
1050 mcs = xen_mc_entry(0);
1052 MULTI_fpu_taskswitch(mcs.mc, (cr0 & X86_CR0_TS) != 0);
1054 xen_mc_issue(PARAVIRT_LAZY_CPU);
1057 static void xen_write_cr4(unsigned long cr4)
1059 cr4 &= ~X86_CR4_PGE;
1060 cr4 &= ~X86_CR4_PSE;
1062 native_write_cr4(cr4);
1064 #ifdef CONFIG_X86_64
1065 static inline unsigned long xen_read_cr8(void)
1069 static inline void xen_write_cr8(unsigned long val)
1075 static u64 xen_read_msr_safe(unsigned int msr, int *err)
1079 val = native_read_msr_safe(msr, err);
1081 case MSR_IA32_APICBASE:
1082 #ifdef CONFIG_X86_X2APIC
1083 if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))
1085 val &= ~X2APIC_ENABLE;
1091 static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
1098 #ifdef CONFIG_X86_64
1102 case MSR_FS_BASE: which = SEGBASE_FS; goto set;
1103 case MSR_KERNEL_GS_BASE: which = SEGBASE_GS_USER; goto set;
1104 case MSR_GS_BASE: which = SEGBASE_GS_KERNEL; goto set;
1107 base = ((u64)high << 32) | low;
1108 if (HYPERVISOR_set_segment_base(which, base) != 0)
1116 case MSR_SYSCALL_MASK:
1117 case MSR_IA32_SYSENTER_CS:
1118 case MSR_IA32_SYSENTER_ESP:
1119 case MSR_IA32_SYSENTER_EIP:
1120 /* Fast syscall setup is all done in hypercalls, so
1121 these are all ignored. Stub them out here to stop
1122 Xen console noise. */
1125 ret = native_write_msr_safe(msr, low, high);
1131 void xen_setup_shared_info(void)
1133 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
1134 set_fixmap(FIX_PARAVIRT_BOOTMAP,
1135 xen_start_info->shared_info);
1137 HYPERVISOR_shared_info =
1138 (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
1140 HYPERVISOR_shared_info =
1141 (struct shared_info *)__va(xen_start_info->shared_info);
1144 /* In UP this is as good a place as any to set up shared info */
1145 xen_setup_vcpu_info_placement();
1148 xen_setup_mfn_list_list();
1151 /* This is called once we have the cpu_possible_mask */
1152 void xen_setup_vcpu_info_placement(void)
1156 for_each_possible_cpu(cpu)
1157 xen_vcpu_setup(cpu);
1159 /* xen_vcpu_setup managed to place the vcpu_info within the
1160 * percpu area for all cpus, so make use of it. Note that for
1161 * PVH we want to use native IRQ mechanism. */
1162 if (have_vcpu_info_placement && !xen_pvh_domain()) {
1163 pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
1164 pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
1165 pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
1166 pv_irq_ops.irq_enable = __PV_IS_CALLEE_SAVE(xen_irq_enable_direct);
1167 pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
1171 static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf,
1172 unsigned long addr, unsigned len)
1174 char *start, *end, *reloc;
1177 start = end = reloc = NULL;
1179 #define SITE(op, x) \
1180 case PARAVIRT_PATCH(op.x): \
1181 if (have_vcpu_info_placement) { \
1182 start = (char *)xen_##x##_direct; \
1183 end = xen_##x##_direct_end; \
1184 reloc = xen_##x##_direct_reloc; \
1189 SITE(pv_irq_ops, irq_enable);
1190 SITE(pv_irq_ops, irq_disable);
1191 SITE(pv_irq_ops, save_fl);
1192 SITE(pv_irq_ops, restore_fl);
1196 if (start == NULL || (end-start) > len)
1199 ret = paravirt_patch_insns(insnbuf, len, start, end);
1201 /* Note: because reloc is assigned from something that
1202 appears to be an array, gcc assumes it's non-null,
1203 but doesn't know its relationship with start and
1205 if (reloc > start && reloc < end) {
1206 int reloc_off = reloc - start;
1207 long *relocp = (long *)(insnbuf + reloc_off);
1208 long delta = start - (char *)addr;
1216 ret = paravirt_patch_default(type, clobbers, insnbuf,
1224 static const struct pv_info xen_info __initconst = {
1225 .paravirt_enabled = 1,
1226 .shared_kernel_pmd = 0,
1228 #ifdef CONFIG_X86_64
1229 .extra_user_64bit_cs = FLAT_USER_CS64,
1235 static const struct pv_init_ops xen_init_ops __initconst = {
1239 static const struct pv_cpu_ops xen_cpu_ops __initconst = {
1242 .set_debugreg = xen_set_debugreg,
1243 .get_debugreg = xen_get_debugreg,
1247 .read_cr0 = xen_read_cr0,
1248 .write_cr0 = xen_write_cr0,
1250 .read_cr4 = native_read_cr4,
1251 .read_cr4_safe = native_read_cr4_safe,
1252 .write_cr4 = xen_write_cr4,
1254 #ifdef CONFIG_X86_64
1255 .read_cr8 = xen_read_cr8,
1256 .write_cr8 = xen_write_cr8,
1259 .wbinvd = native_wbinvd,
1261 .read_msr = xen_read_msr_safe,
1262 .write_msr = xen_write_msr_safe,
1264 .read_tsc = native_read_tsc,
1265 .read_pmc = native_read_pmc,
1267 .read_tscp = native_read_tscp,
1270 .irq_enable_sysexit = xen_sysexit,
1271 #ifdef CONFIG_X86_64
1272 .usergs_sysret32 = xen_sysret32,
1273 .usergs_sysret64 = xen_sysret64,
1276 .load_tr_desc = paravirt_nop,
1277 .set_ldt = xen_set_ldt,
1278 .load_gdt = xen_load_gdt,
1279 .load_idt = xen_load_idt,
1280 .load_tls = xen_load_tls,
1281 #ifdef CONFIG_X86_64
1282 .load_gs_index = xen_load_gs_index,
1285 .alloc_ldt = xen_alloc_ldt,
1286 .free_ldt = xen_free_ldt,
1288 .store_idt = native_store_idt,
1289 .store_tr = xen_store_tr,
1291 .write_ldt_entry = xen_write_ldt_entry,
1292 .write_gdt_entry = xen_write_gdt_entry,
1293 .write_idt_entry = xen_write_idt_entry,
1294 .load_sp0 = xen_load_sp0,
1296 .set_iopl_mask = xen_set_iopl_mask,
1297 .io_delay = xen_io_delay,
1299 /* Xen takes care of %gs when switching to usermode for us */
1300 .swapgs = paravirt_nop,
1302 .start_context_switch = paravirt_start_context_switch,
1303 .end_context_switch = xen_end_context_switch,
1306 static const struct pv_apic_ops xen_apic_ops __initconst = {
1307 #ifdef CONFIG_X86_LOCAL_APIC
1308 .startup_ipi_hook = paravirt_nop,
1312 static void xen_reboot(int reason)
1314 struct sched_shutdown r = { .reason = reason };
1316 if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
1320 static void xen_restart(char *msg)
1322 xen_reboot(SHUTDOWN_reboot);
1325 static void xen_emergency_restart(void)
1327 xen_reboot(SHUTDOWN_reboot);
1330 static void xen_machine_halt(void)
1332 xen_reboot(SHUTDOWN_poweroff);
1335 static void xen_machine_power_off(void)
1339 xen_reboot(SHUTDOWN_poweroff);
1342 static void xen_crash_shutdown(struct pt_regs *regs)
1344 xen_reboot(SHUTDOWN_crash);
1348 xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
1350 xen_reboot(SHUTDOWN_crash);
1354 static struct notifier_block xen_panic_block = {
1355 .notifier_call= xen_panic_event,
1359 int xen_panic_handler_init(void)
1361 atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
1365 static const struct machine_ops xen_machine_ops __initconst = {
1366 .restart = xen_restart,
1367 .halt = xen_machine_halt,
1368 .power_off = xen_machine_power_off,
1369 .shutdown = xen_machine_halt,
1370 .crash_shutdown = xen_crash_shutdown,
1371 .emergency_restart = xen_emergency_restart,
1374 static unsigned char xen_get_nmi_reason(void)
1376 unsigned char reason = 0;
1378 /* Construct a value which looks like it came from port 0x61. */
1379 if (test_bit(_XEN_NMIREASON_io_error,
1380 &HYPERVISOR_shared_info->arch.nmi_reason))
1381 reason |= NMI_REASON_IOCHK;
1382 if (test_bit(_XEN_NMIREASON_pci_serr,
1383 &HYPERVISOR_shared_info->arch.nmi_reason))
1384 reason |= NMI_REASON_SERR;
1389 static void __init xen_boot_params_init_edd(void)
1391 #if IS_ENABLED(CONFIG_EDD)
1392 struct xen_platform_op op;
1393 struct edd_info *edd_info;
1398 edd_info = boot_params.eddbuf;
1399 mbr_signature = boot_params.edd_mbr_sig_buffer;
1401 op.cmd = XENPF_firmware_info;
1403 op.u.firmware_info.type = XEN_FW_DISK_INFO;
1404 for (nr = 0; nr < EDDMAXNR; nr++) {
1405 struct edd_info *info = edd_info + nr;
1407 op.u.firmware_info.index = nr;
1408 info->params.length = sizeof(info->params);
1409 set_xen_guest_handle(op.u.firmware_info.u.disk_info.edd_params,
1411 ret = HYPERVISOR_dom0_op(&op);
1415 #define C(x) info->x = op.u.firmware_info.u.disk_info.x
1418 C(interface_support);
1419 C(legacy_max_cylinder);
1421 C(legacy_sectors_per_track);
1424 boot_params.eddbuf_entries = nr;
1426 op.u.firmware_info.type = XEN_FW_DISK_MBR_SIGNATURE;
1427 for (nr = 0; nr < EDD_MBR_SIG_MAX; nr++) {
1428 op.u.firmware_info.index = nr;
1429 ret = HYPERVISOR_dom0_op(&op);
1432 mbr_signature[nr] = op.u.firmware_info.u.disk_mbr_signature.mbr_signature;
1434 boot_params.edd_mbr_sig_buf_entries = nr;
1439 * Set up the GDT and segment registers for -fstack-protector. Until
1440 * we do this, we have to be careful not to call any stack-protected
1441 * function, which is most of the kernel.
1443 * Note, that it is __ref because the only caller of this after init
1444 * is PVH which is not going to use xen_load_gdt_boot or other
1447 static void __ref xen_setup_gdt(int cpu)
1449 if (xen_feature(XENFEAT_auto_translated_physmap)) {
1450 #ifdef CONFIG_X86_64
1451 unsigned long dummy;
1453 load_percpu_segment(cpu); /* We need to access per-cpu area */
1454 switch_to_new_gdt(cpu); /* GDT and GS set */
1456 /* We are switching of the Xen provided GDT to our HVM mode
1457 * GDT. The new GDT has __KERNEL_CS with CS.L = 1
1458 * and we are jumping to reload it.
1460 asm volatile ("pushq %0\n"
1461 "leaq 1f(%%rip),%0\n"
1465 : "=&r" (dummy) : "0" (__KERNEL_CS));
1468 * While not needed, we also set the %es, %ds, and %fs
1469 * to zero. We don't care about %ss as it is NULL.
1470 * Strictly speaking this is not needed as Xen zeros those
1471 * out (and also MSR_FS_BASE, MSR_GS_BASE, MSR_KERNEL_GS_BASE)
1473 * Linux zeros them in cpu_init() and in secondary_startup_64
1480 /* PVH: TODO Implement. */
1483 return; /* PVH does not need any PV GDT ops. */
1485 pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
1486 pv_cpu_ops.load_gdt = xen_load_gdt_boot;
1488 setup_stack_canary_segment(0);
1489 switch_to_new_gdt(0);
1491 pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry;
1492 pv_cpu_ops.load_gdt = xen_load_gdt;
1495 #ifdef CONFIG_XEN_PVH
1497 * A PV guest starts with default flags that are not set for PVH, set them
1500 static void xen_pvh_set_cr_flags(int cpu)
1503 /* Some of these are setup in 'secondary_startup_64'. The others:
1504 * X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests
1505 * (which PVH shared codepaths), while X86_CR0_PG is for PVH. */
1506 write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM);
1511 * For BSP, PSE PGE are set in probe_page_size_mask(), for APs
1512 * set them here. For all, OSFXSR OSXMMEXCPT are set in fpu_init.
1515 cr4_set_bits_and_update_boot(X86_CR4_PSE);
1518 cr4_set_bits_and_update_boot(X86_CR4_PGE);
1522 * Note, that it is ref - because the only caller of this after init
1523 * is PVH which is not going to use xen_load_gdt_boot or other
1526 void __ref xen_pvh_secondary_vcpu_init(int cpu)
1529 xen_pvh_set_cr_flags(cpu);
1532 static void __init xen_pvh_early_guest_init(void)
1534 if (!xen_feature(XENFEAT_auto_translated_physmap))
1537 if (!xen_feature(XENFEAT_hvm_callback_vector))
1540 xen_have_vector_callback = 1;
1542 xen_pvh_early_cpu_init(0, false);
1543 xen_pvh_set_cr_flags(0);
1545 #ifdef CONFIG_X86_32
1546 BUG(); /* PVH: Implement proper support. */
1549 #endif /* CONFIG_XEN_PVH */
1551 /* First C function to be called on Xen boot */
1552 asmlinkage __visible void __init xen_start_kernel(void)
1554 struct physdev_set_iopl set_iopl;
1555 unsigned long initrd_start = 0;
1558 if (!xen_start_info)
1561 xen_domain_type = XEN_PV_DOMAIN;
1563 xen_setup_features();
1564 #ifdef CONFIG_XEN_PVH
1565 xen_pvh_early_guest_init();
1567 xen_setup_machphys_mapping();
1569 /* Install Xen paravirt ops */
1571 pv_init_ops = xen_init_ops;
1572 pv_apic_ops = xen_apic_ops;
1573 if (!xen_pvh_domain()) {
1574 pv_cpu_ops = xen_cpu_ops;
1576 x86_platform.get_nmi_reason = xen_get_nmi_reason;
1579 if (xen_feature(XENFEAT_auto_translated_physmap))
1580 x86_init.resources.memory_setup = xen_auto_xlated_memory_setup;
1582 x86_init.resources.memory_setup = xen_memory_setup;
1583 x86_init.oem.arch_setup = xen_arch_setup;
1584 x86_init.oem.banner = xen_banner;
1586 xen_init_time_ops();
1589 * Set up some pagetable state before starting to set any ptes.
1594 /* Prevent unwanted bits from being set in PTEs. */
1595 __supported_pte_mask &= ~_PAGE_GLOBAL;
1598 * Prevent page tables from being allocated in highmem, even
1599 * if CONFIG_HIGHPTE is enabled.
1601 __userpte_alloc_gfp &= ~__GFP_HIGHMEM;
1603 /* Work out if we support NX */
1607 xen_build_dynamic_phys_to_machine();
1610 * Set up kernel GDT and segment registers, mainly so that
1611 * -fstack-protector code can be executed.
1616 xen_init_cpuid_mask();
1618 #ifdef CONFIG_X86_LOCAL_APIC
1620 * set up the basic apic ops.
1622 set_xen_basic_apic_ops();
1625 if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
1626 pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
1627 pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
1630 machine_ops = xen_machine_ops;
1633 * The only reliable way to retain the initial address of the
1634 * percpu gdt_page is to remember it here, so we can go and
1635 * mark it RW later, when the initial percpu area is freed.
1637 xen_initial_gdt = &per_cpu(gdt_page, 0);
1641 #ifdef CONFIG_ACPI_NUMA
1643 * The pages we from Xen are not related to machine pages, so
1644 * any NUMA information the kernel tries to get from ACPI will
1645 * be meaningless. Prevent it from trying.
1649 /* Don't do the full vcpu_info placement stuff until we have a
1650 possible map and a non-dummy shared_info. */
1651 per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
1653 local_irq_disable();
1654 early_boot_irqs_disabled = true;
1656 xen_raw_console_write("mapping kernel into physical memory\n");
1657 xen_setup_kernel_pagetable((pgd_t *)xen_start_info->pt_base, xen_start_info->nr_pages);
1660 * Modify the cache mode translation tables to match Xen's PAT
1664 pat_init_cache_modes();
1666 /* keep using Xen gdt for now; no urgent need to change it */
1668 #ifdef CONFIG_X86_32
1669 pv_info.kernel_rpl = 1;
1670 if (xen_feature(XENFEAT_supervisor_mode_kernel))
1671 pv_info.kernel_rpl = 0;
1673 pv_info.kernel_rpl = 0;
1675 /* set the limit of our address space */
1678 /* PVH: runs at default kernel iopl of 0 */
1679 if (!xen_pvh_domain()) {
1681 * We used to do this in xen_arch_setup, but that is too late
1682 * on AMD were early_cpu_init (run before ->arch_setup()) calls
1683 * early_amd_init which pokes 0xcf8 port.
1686 rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
1688 xen_raw_printk("physdev_op failed %d\n", rc);
1691 #ifdef CONFIG_X86_32
1692 /* set up basic CPUID stuff */
1693 cpu_detect(&new_cpu_data);
1694 set_cpu_cap(&new_cpu_data, X86_FEATURE_FPU);
1695 new_cpu_data.wp_works_ok = 1;
1696 new_cpu_data.x86_capability[0] = cpuid_edx(1);
1699 if (xen_start_info->mod_start) {
1700 if (xen_start_info->flags & SIF_MOD_START_PFN)
1701 initrd_start = PFN_PHYS(xen_start_info->mod_start);
1703 initrd_start = __pa(xen_start_info->mod_start);
1706 /* Poke various useful things into boot_params */
1707 boot_params.hdr.type_of_loader = (9 << 4) | 0;
1708 boot_params.hdr.ramdisk_image = initrd_start;
1709 boot_params.hdr.ramdisk_size = xen_start_info->mod_len;
1710 boot_params.hdr.cmd_line_ptr = __pa(xen_start_info->cmd_line);
1712 if (!xen_initial_domain()) {
1713 add_preferred_console("xenboot", 0, NULL);
1714 add_preferred_console("tty", 0, NULL);
1715 add_preferred_console("hvc", 0, NULL);
1717 x86_init.pci.arch_init = pci_xen_init;
1719 const struct dom0_vga_console_info *info =
1720 (void *)((char *)xen_start_info +
1721 xen_start_info->console.dom0.info_off);
1722 struct xen_platform_op op = {
1723 .cmd = XENPF_firmware_info,
1724 .interface_version = XENPF_INTERFACE_VERSION,
1725 .u.firmware_info.type = XEN_FW_KBD_SHIFT_FLAGS,
1728 xen_init_vga(info, xen_start_info->console.dom0.info_size);
1729 xen_start_info->console.domU.mfn = 0;
1730 xen_start_info->console.domU.evtchn = 0;
1732 if (HYPERVISOR_dom0_op(&op) == 0)
1733 boot_params.kbd_status = op.u.firmware_info.u.kbd_shift_flags;
1737 /* Make sure ACS will be enabled */
1740 xen_acpi_sleep_register();
1742 /* Avoid searching for BIOS MP tables */
1743 x86_init.mpparse.find_smp_config = x86_init_noop;
1744 x86_init.mpparse.get_smp_config = x86_init_uint_noop;
1746 xen_boot_params_init_edd();
1749 /* PCI BIOS service won't work from a PV guest. */
1750 pci_probe &= ~PCI_PROBE_BIOS;
1752 xen_raw_console_write("about to get started...\n");
1754 xen_setup_runstate_info(0);
1758 /* Start the world */
1759 #ifdef CONFIG_X86_32
1760 i386_start_kernel();
1762 cr4_init_shadow(); /* 32b kernel does this in i386_start_kernel() */
1763 x86_64_start_reservations((char *)__pa_symbol(&boot_params));
1767 void __ref xen_hvm_init_shared_info(void)
1770 struct xen_add_to_physmap xatp;
1771 static struct shared_info *shared_info_page = 0;
1773 if (!shared_info_page)
1774 shared_info_page = (struct shared_info *)
1775 extend_brk(PAGE_SIZE, PAGE_SIZE);
1776 xatp.domid = DOMID_SELF;
1778 xatp.space = XENMAPSPACE_shared_info;
1779 xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
1780 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
1783 HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
1785 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
1786 * page, we use it in the event channel upcall and in some pvclock
1787 * related functions. We don't need the vcpu_info placement
1788 * optimizations because we don't use any pv_mmu or pv_irq op on
1790 * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
1791 * online but xen_hvm_init_shared_info is run at resume time too and
1792 * in that case multiple vcpus might be online. */
1793 for_each_online_cpu(cpu) {
1794 /* Leave it to be NULL. */
1795 if (cpu >= MAX_VIRT_CPUS)
1797 per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
1801 #ifdef CONFIG_XEN_PVHVM
1802 static void __init init_hvm_pv_info(void)
1805 uint32_t eax, ebx, ecx, edx, pages, msr, base;
1808 base = xen_cpuid_base();
1809 cpuid(base + 1, &eax, &ebx, &ecx, &edx);
1812 minor = eax & 0xffff;
1813 printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
1815 cpuid(base + 2, &pages, &msr, &ecx, &edx);
1817 pfn = __pa(hypercall_page);
1818 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
1820 xen_setup_features();
1822 pv_info.name = "Xen HVM";
1824 xen_domain_type = XEN_HVM_DOMAIN;
1827 static int xen_hvm_cpu_notify(struct notifier_block *self, unsigned long action,
1830 int cpu = (long)hcpu;
1832 case CPU_UP_PREPARE:
1833 xen_vcpu_setup(cpu);
1834 if (xen_have_vector_callback) {
1835 if (xen_feature(XENFEAT_hvm_safe_pvclock))
1836 xen_setup_timer(cpu);
1845 static struct notifier_block xen_hvm_cpu_notifier = {
1846 .notifier_call = xen_hvm_cpu_notify,
1849 static void __init xen_hvm_guest_init(void)
1853 xen_hvm_init_shared_info();
1855 xen_panic_handler_init();
1857 if (xen_feature(XENFEAT_hvm_callback_vector))
1858 xen_have_vector_callback = 1;
1860 register_cpu_notifier(&xen_hvm_cpu_notifier);
1861 xen_unplug_emulated_devices();
1862 x86_init.irqs.intr_init = xen_init_IRQ;
1863 xen_hvm_init_time_ops();
1864 xen_hvm_init_mmu_ops();
1867 static bool xen_nopv = false;
1868 static __init int xen_parse_nopv(char *arg)
1873 early_param("xen_nopv", xen_parse_nopv);
1875 static uint32_t __init xen_hvm_platform(void)
1880 if (xen_pv_domain())
1883 return xen_cpuid_base();
1886 bool xen_hvm_need_lapic(void)
1890 if (xen_pv_domain())
1892 if (!xen_hvm_domain())
1894 if (xen_feature(XENFEAT_hvm_pirqs) && xen_have_vector_callback)
1898 EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);
1900 const struct hypervisor_x86 x86_hyper_xen_hvm __refconst = {
1902 .detect = xen_hvm_platform,
1903 .init_platform = xen_hvm_guest_init,
1904 .x2apic_available = xen_x2apic_para_available,
1906 EXPORT_SYMBOL(x86_hyper_xen_hvm);