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/xen-mca.h>
44 #include <xen/features.h>
47 #include <xen/hvc-console.h>
50 #include <asm/paravirt.h>
53 #include <asm/xen/pci.h>
54 #include <asm/xen/hypercall.h>
55 #include <asm/xen/hypervisor.h>
56 #include <asm/fixmap.h>
57 #include <asm/processor.h>
58 #include <asm/proto.h>
59 #include <asm/msr-index.h>
60 #include <asm/traps.h>
61 #include <asm/setup.h>
63 #include <asm/pgalloc.h>
64 #include <asm/pgtable.h>
65 #include <asm/tlbflush.h>
66 #include <asm/reboot.h>
67 #include <asm/stackprotector.h>
68 #include <asm/hypervisor.h>
69 #include <asm/mwait.h>
70 #include <asm/pci_x86.h>
74 #include <linux/acpi.h>
76 #include <acpi/pdc_intel.h>
77 #include <acpi/processor.h>
78 #include <xen/interface/platform.h>
84 #include "multicalls.h"
86 EXPORT_SYMBOL_GPL(hypercall_page
);
88 DEFINE_PER_CPU(struct vcpu_info
*, xen_vcpu
);
89 DEFINE_PER_CPU(struct vcpu_info
, xen_vcpu_info
);
91 enum xen_domain_type xen_domain_type
= XEN_NATIVE
;
92 EXPORT_SYMBOL_GPL(xen_domain_type
);
94 unsigned long *machine_to_phys_mapping
= (void *)MACH2PHYS_VIRT_START
;
95 EXPORT_SYMBOL(machine_to_phys_mapping
);
96 unsigned long machine_to_phys_nr
;
97 EXPORT_SYMBOL(machine_to_phys_nr
);
99 struct start_info
*xen_start_info
;
100 EXPORT_SYMBOL_GPL(xen_start_info
);
102 struct shared_info xen_dummy_shared_info
;
104 void *xen_initial_gdt
;
106 RESERVE_BRK(shared_info_page_brk
, PAGE_SIZE
);
107 __read_mostly
int xen_have_vector_callback
;
108 EXPORT_SYMBOL_GPL(xen_have_vector_callback
);
111 * Point at some empty memory to start with. We map the real shared_info
112 * page as soon as fixmap is up and running.
114 struct shared_info
*HYPERVISOR_shared_info
= &xen_dummy_shared_info
;
117 * Flag to determine whether vcpu info placement is available on all
118 * VCPUs. We assume it is to start with, and then set it to zero on
119 * the first failure. This is because it can succeed on some VCPUs
120 * and not others, since it can involve hypervisor memory allocation,
121 * or because the guest failed to guarantee all the appropriate
122 * constraints on all VCPUs (ie buffer can't cross a page boundary).
124 * Note that any particular CPU may be using a placed vcpu structure,
125 * but we can only optimise if the all are.
127 * 0: not available, 1: available
129 static int have_vcpu_info_placement
= 1;
132 struct desc_struct desc
[3];
136 * Updating the 3 TLS descriptors in the GDT on every task switch is
137 * surprisingly expensive so we avoid updating them if they haven't
138 * changed. Since Xen writes different descriptors than the one
139 * passed in the update_descriptor hypercall we keep shadow copies to
142 static DEFINE_PER_CPU(struct tls_descs
, shadow_tls_desc
);
144 static void clamp_max_cpus(void)
147 if (setup_max_cpus
> MAX_VIRT_CPUS
)
148 setup_max_cpus
= MAX_VIRT_CPUS
;
152 static void xen_vcpu_setup(int cpu
)
154 struct vcpu_register_vcpu_info info
;
156 struct vcpu_info
*vcpup
;
158 BUG_ON(HYPERVISOR_shared_info
== &xen_dummy_shared_info
);
160 if (cpu
< MAX_VIRT_CPUS
)
161 per_cpu(xen_vcpu
,cpu
) = &HYPERVISOR_shared_info
->vcpu_info
[cpu
];
163 if (!have_vcpu_info_placement
) {
164 if (cpu
>= MAX_VIRT_CPUS
)
169 vcpup
= &per_cpu(xen_vcpu_info
, cpu
);
170 info
.mfn
= arbitrary_virt_to_mfn(vcpup
);
171 info
.offset
= offset_in_page(vcpup
);
173 /* Check to see if the hypervisor will put the vcpu_info
174 structure where we want it, which allows direct access via
175 a percpu-variable. */
176 err
= HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info
, cpu
, &info
);
179 printk(KERN_DEBUG
"register_vcpu_info failed: err=%d\n", err
);
180 have_vcpu_info_placement
= 0;
183 /* This cpu is using the registered vcpu info, even if
184 later ones fail to. */
185 per_cpu(xen_vcpu
, cpu
) = vcpup
;
190 * On restore, set the vcpu placement up again.
191 * If it fails, then we're in a bad state, since
192 * we can't back out from using it...
194 void xen_vcpu_restore(void)
198 for_each_possible_cpu(cpu
) {
199 bool other_cpu
= (cpu
!= smp_processor_id());
200 bool is_up
= HYPERVISOR_vcpu_op(VCPUOP_is_up
, cpu
, NULL
);
202 if (other_cpu
&& is_up
&&
203 HYPERVISOR_vcpu_op(VCPUOP_down
, cpu
, NULL
))
206 xen_setup_runstate_info(cpu
);
208 if (have_vcpu_info_placement
)
211 if (other_cpu
&& is_up
&&
212 HYPERVISOR_vcpu_op(VCPUOP_up
, cpu
, NULL
))
217 static void __init
xen_banner(void)
219 unsigned version
= HYPERVISOR_xen_version(XENVER_version
, NULL
);
220 struct xen_extraversion extra
;
221 HYPERVISOR_xen_version(XENVER_extraversion
, &extra
);
223 printk(KERN_INFO
"Booting paravirtualized kernel on %s\n",
225 printk(KERN_INFO
"Xen version: %d.%d%s%s\n",
226 version
>> 16, version
& 0xffff, extra
.extraversion
,
227 xen_feature(XENFEAT_mmu_pt_update_preserve_ad
) ? " (preserve-AD)" : "");
229 /* Check if running on Xen version (major, minor) or later */
231 xen_running_on_version_or_later(unsigned int major
, unsigned int minor
)
233 unsigned int version
;
238 version
= HYPERVISOR_xen_version(XENVER_version
, NULL
);
239 if ((((version
>> 16) == major
) && ((version
& 0xffff) >= minor
)) ||
240 ((version
>> 16) > major
))
245 #define CPUID_THERM_POWER_LEAF 6
246 #define APERFMPERF_PRESENT 0
248 static __read_mostly
unsigned int cpuid_leaf1_edx_mask
= ~0;
249 static __read_mostly
unsigned int cpuid_leaf1_ecx_mask
= ~0;
251 static __read_mostly
unsigned int cpuid_leaf1_ecx_set_mask
;
252 static __read_mostly
unsigned int cpuid_leaf5_ecx_val
;
253 static __read_mostly
unsigned int cpuid_leaf5_edx_val
;
255 static void xen_cpuid(unsigned int *ax
, unsigned int *bx
,
256 unsigned int *cx
, unsigned int *dx
)
258 unsigned maskebx
= ~0;
259 unsigned maskecx
= ~0;
260 unsigned maskedx
= ~0;
263 * Mask out inconvenient features, to try and disable as many
264 * unsupported kernel subsystems as possible.
268 maskecx
= cpuid_leaf1_ecx_mask
;
269 setecx
= cpuid_leaf1_ecx_set_mask
;
270 maskedx
= cpuid_leaf1_edx_mask
;
273 case CPUID_MWAIT_LEAF
:
274 /* Synthesize the values.. */
277 *cx
= cpuid_leaf5_ecx_val
;
278 *dx
= cpuid_leaf5_edx_val
;
281 case CPUID_THERM_POWER_LEAF
:
282 /* Disabling APERFMPERF for kernel usage */
283 maskecx
= ~(1 << APERFMPERF_PRESENT
);
287 /* Suppress extended topology stuff */
292 asm(XEN_EMULATE_PREFIX
"cpuid"
297 : "0" (*ax
), "2" (*cx
));
306 static bool __init
xen_check_mwait(void)
309 struct xen_platform_op op
= {
310 .cmd
= XENPF_set_processor_pminfo
,
311 .u
.set_pminfo
.id
= -1,
312 .u
.set_pminfo
.type
= XEN_PM_PDC
,
315 unsigned int ax
, bx
, cx
, dx
;
316 unsigned int mwait_mask
;
318 /* We need to determine whether it is OK to expose the MWAIT
319 * capability to the kernel to harvest deeper than C3 states from ACPI
320 * _CST using the processor_harvest_xen.c module. For this to work, we
321 * need to gather the MWAIT_LEAF values (which the cstate.c code
322 * checks against). The hypervisor won't expose the MWAIT flag because
323 * it would break backwards compatibility; so we will find out directly
324 * from the hardware and hypercall.
326 if (!xen_initial_domain())
330 * When running under platform earlier than Xen4.2, do not expose
331 * mwait, to avoid the risk of loading native acpi pad driver
333 if (!xen_running_on_version_or_later(4, 2))
339 native_cpuid(&ax
, &bx
, &cx
, &dx
);
341 mwait_mask
= (1 << (X86_FEATURE_EST
% 32)) |
342 (1 << (X86_FEATURE_MWAIT
% 32));
344 if ((cx
& mwait_mask
) != mwait_mask
)
347 /* We need to emulate the MWAIT_LEAF and for that we need both
348 * ecx and edx. The hypercall provides only partial information.
351 ax
= CPUID_MWAIT_LEAF
;
356 native_cpuid(&ax
, &bx
, &cx
, &dx
);
358 /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so,
359 * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3.
361 buf
[0] = ACPI_PDC_REVISION_ID
;
363 buf
[2] = (ACPI_PDC_C_CAPABILITY_SMP
| ACPI_PDC_EST_CAPABILITY_SWSMP
);
365 set_xen_guest_handle(op
.u
.set_pminfo
.pdc
, buf
);
367 if ((HYPERVISOR_dom0_op(&op
) == 0) &&
368 (buf
[2] & (ACPI_PDC_C_C1_FFH
| ACPI_PDC_C_C2C3_FFH
))) {
369 cpuid_leaf5_ecx_val
= cx
;
370 cpuid_leaf5_edx_val
= dx
;
377 static void __init
xen_init_cpuid_mask(void)
379 unsigned int ax
, bx
, cx
, dx
;
380 unsigned int xsave_mask
;
382 cpuid_leaf1_edx_mask
=
383 ~((1 << X86_FEATURE_MTRR
) | /* disable MTRR */
384 (1 << X86_FEATURE_ACC
)); /* thermal monitoring */
386 if (!xen_initial_domain())
387 cpuid_leaf1_edx_mask
&=
388 ~((1 << X86_FEATURE_APIC
) | /* disable local APIC */
389 (1 << X86_FEATURE_ACPI
)); /* disable ACPI */
392 xen_cpuid(&ax
, &bx
, &cx
, &dx
);
395 (1 << (X86_FEATURE_XSAVE
% 32)) |
396 (1 << (X86_FEATURE_OSXSAVE
% 32));
398 /* Xen will set CR4.OSXSAVE if supported and not disabled by force */
399 if ((cx
& xsave_mask
) != xsave_mask
)
400 cpuid_leaf1_ecx_mask
&= ~xsave_mask
; /* disable XSAVE & OSXSAVE */
401 if (xen_check_mwait())
402 cpuid_leaf1_ecx_set_mask
= (1 << (X86_FEATURE_MWAIT
% 32));
405 static void xen_set_debugreg(int reg
, unsigned long val
)
407 HYPERVISOR_set_debugreg(reg
, val
);
410 static unsigned long xen_get_debugreg(int reg
)
412 return HYPERVISOR_get_debugreg(reg
);
415 static void xen_end_context_switch(struct task_struct
*next
)
418 paravirt_end_context_switch(next
);
421 static unsigned long xen_store_tr(void)
427 * Set the page permissions for a particular virtual address. If the
428 * address is a vmalloc mapping (or other non-linear mapping), then
429 * find the linear mapping of the page and also set its protections to
432 static void set_aliased_prot(void *v
, pgprot_t prot
)
440 ptep
= lookup_address((unsigned long)v
, &level
);
441 BUG_ON(ptep
== NULL
);
443 pfn
= pte_pfn(*ptep
);
444 page
= pfn_to_page(pfn
);
446 pte
= pfn_pte(pfn
, prot
);
448 if (HYPERVISOR_update_va_mapping((unsigned long)v
, pte
, 0))
451 if (!PageHighMem(page
)) {
452 void *av
= __va(PFN_PHYS(pfn
));
455 if (HYPERVISOR_update_va_mapping((unsigned long)av
, pte
, 0))
461 static void xen_alloc_ldt(struct desc_struct
*ldt
, unsigned entries
)
463 const unsigned entries_per_page
= PAGE_SIZE
/ LDT_ENTRY_SIZE
;
466 for(i
= 0; i
< entries
; i
+= entries_per_page
)
467 set_aliased_prot(ldt
+ i
, PAGE_KERNEL_RO
);
470 static void xen_free_ldt(struct desc_struct
*ldt
, unsigned entries
)
472 const unsigned entries_per_page
= PAGE_SIZE
/ LDT_ENTRY_SIZE
;
475 for(i
= 0; i
< entries
; i
+= entries_per_page
)
476 set_aliased_prot(ldt
+ i
, PAGE_KERNEL
);
479 static void xen_set_ldt(const void *addr
, unsigned entries
)
481 struct mmuext_op
*op
;
482 struct multicall_space mcs
= xen_mc_entry(sizeof(*op
));
484 trace_xen_cpu_set_ldt(addr
, entries
);
487 op
->cmd
= MMUEXT_SET_LDT
;
488 op
->arg1
.linear_addr
= (unsigned long)addr
;
489 op
->arg2
.nr_ents
= entries
;
491 MULTI_mmuext_op(mcs
.mc
, op
, 1, NULL
, DOMID_SELF
);
493 xen_mc_issue(PARAVIRT_LAZY_CPU
);
496 static void xen_load_gdt(const struct desc_ptr
*dtr
)
498 unsigned long va
= dtr
->address
;
499 unsigned int size
= dtr
->size
+ 1;
500 unsigned pages
= (size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
501 unsigned long frames
[pages
];
505 * A GDT can be up to 64k in size, which corresponds to 8192
506 * 8-byte entries, or 16 4k pages..
509 BUG_ON(size
> 65536);
510 BUG_ON(va
& ~PAGE_MASK
);
512 for (f
= 0; va
< dtr
->address
+ size
; va
+= PAGE_SIZE
, f
++) {
515 unsigned long pfn
, mfn
;
519 * The GDT is per-cpu and is in the percpu data area.
520 * That can be virtually mapped, so we need to do a
521 * page-walk to get the underlying MFN for the
522 * hypercall. The page can also be in the kernel's
523 * linear range, so we need to RO that mapping too.
525 ptep
= lookup_address(va
, &level
);
526 BUG_ON(ptep
== NULL
);
528 pfn
= pte_pfn(*ptep
);
529 mfn
= pfn_to_mfn(pfn
);
530 virt
= __va(PFN_PHYS(pfn
));
534 make_lowmem_page_readonly((void *)va
);
535 make_lowmem_page_readonly(virt
);
538 if (HYPERVISOR_set_gdt(frames
, size
/ sizeof(struct desc_struct
)))
543 * load_gdt for early boot, when the gdt is only mapped once
545 static void __init
xen_load_gdt_boot(const struct desc_ptr
*dtr
)
547 unsigned long va
= dtr
->address
;
548 unsigned int size
= dtr
->size
+ 1;
549 unsigned pages
= (size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
550 unsigned long frames
[pages
];
554 * A GDT can be up to 64k in size, which corresponds to 8192
555 * 8-byte entries, or 16 4k pages..
558 BUG_ON(size
> 65536);
559 BUG_ON(va
& ~PAGE_MASK
);
561 for (f
= 0; va
< dtr
->address
+ size
; va
+= PAGE_SIZE
, f
++) {
563 unsigned long pfn
, mfn
;
565 pfn
= virt_to_pfn(va
);
566 mfn
= pfn_to_mfn(pfn
);
568 pte
= pfn_pte(pfn
, PAGE_KERNEL_RO
);
570 if (HYPERVISOR_update_va_mapping((unsigned long)va
, pte
, 0))
576 if (HYPERVISOR_set_gdt(frames
, size
/ sizeof(struct desc_struct
)))
580 static inline bool desc_equal(const struct desc_struct
*d1
,
581 const struct desc_struct
*d2
)
583 return d1
->a
== d2
->a
&& d1
->b
== d2
->b
;
586 static void load_TLS_descriptor(struct thread_struct
*t
,
587 unsigned int cpu
, unsigned int i
)
589 struct desc_struct
*shadow
= &per_cpu(shadow_tls_desc
, cpu
).desc
[i
];
590 struct desc_struct
*gdt
;
592 struct multicall_space mc
;
594 if (desc_equal(shadow
, &t
->tls_array
[i
]))
597 *shadow
= t
->tls_array
[i
];
599 gdt
= get_cpu_gdt_table(cpu
);
600 maddr
= arbitrary_virt_to_machine(&gdt
[GDT_ENTRY_TLS_MIN
+i
]);
601 mc
= __xen_mc_entry(0);
603 MULTI_update_descriptor(mc
.mc
, maddr
.maddr
, t
->tls_array
[i
]);
606 static void xen_load_tls(struct thread_struct
*t
, unsigned int cpu
)
609 * XXX sleazy hack: If we're being called in a lazy-cpu zone
610 * and lazy gs handling is enabled, it means we're in a
611 * context switch, and %gs has just been saved. This means we
612 * can zero it out to prevent faults on exit from the
613 * hypervisor if the next process has no %gs. Either way, it
614 * has been saved, and the new value will get loaded properly.
615 * This will go away as soon as Xen has been modified to not
616 * save/restore %gs for normal hypercalls.
618 * On x86_64, this hack is not used for %gs, because gs points
619 * to KERNEL_GS_BASE (and uses it for PDA references), so we
620 * must not zero %gs on x86_64
622 * For x86_64, we need to zero %fs, otherwise we may get an
623 * exception between the new %fs descriptor being loaded and
624 * %fs being effectively cleared at __switch_to().
626 if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU
) {
636 load_TLS_descriptor(t
, cpu
, 0);
637 load_TLS_descriptor(t
, cpu
, 1);
638 load_TLS_descriptor(t
, cpu
, 2);
640 xen_mc_issue(PARAVIRT_LAZY_CPU
);
644 static void xen_load_gs_index(unsigned int idx
)
646 if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL
, idx
))
651 static void xen_write_ldt_entry(struct desc_struct
*dt
, int entrynum
,
654 xmaddr_t mach_lp
= arbitrary_virt_to_machine(&dt
[entrynum
]);
655 u64 entry
= *(u64
*)ptr
;
657 trace_xen_cpu_write_ldt_entry(dt
, entrynum
, entry
);
662 if (HYPERVISOR_update_descriptor(mach_lp
.maddr
, entry
))
668 static int cvt_gate_to_trap(int vector
, const gate_desc
*val
,
669 struct trap_info
*info
)
673 if (val
->type
!= GATE_TRAP
&& val
->type
!= GATE_INTERRUPT
)
676 info
->vector
= vector
;
678 addr
= gate_offset(*val
);
681 * Look for known traps using IST, and substitute them
682 * appropriately. The debugger ones are the only ones we care
683 * about. Xen will handle faults like double_fault,
684 * so we should never see them. Warn if
685 * there's an unexpected IST-using fault handler.
687 if (addr
== (unsigned long)debug
)
688 addr
= (unsigned long)xen_debug
;
689 else if (addr
== (unsigned long)int3
)
690 addr
= (unsigned long)xen_int3
;
691 else if (addr
== (unsigned long)stack_segment
)
692 addr
= (unsigned long)xen_stack_segment
;
693 else if (addr
== (unsigned long)double_fault
||
694 addr
== (unsigned long)nmi
) {
695 /* Don't need to handle these */
697 #ifdef CONFIG_X86_MCE
698 } else if (addr
== (unsigned long)machine_check
) {
700 * when xen hypervisor inject vMCE to guest,
701 * use native mce handler to handle it
706 /* Some other trap using IST? */
707 if (WARN_ON(val
->ist
!= 0))
710 #endif /* CONFIG_X86_64 */
711 info
->address
= addr
;
713 info
->cs
= gate_segment(*val
);
714 info
->flags
= val
->dpl
;
715 /* interrupt gates clear IF */
716 if (val
->type
== GATE_INTERRUPT
)
717 info
->flags
|= 1 << 2;
722 /* Locations of each CPU's IDT */
723 static DEFINE_PER_CPU(struct desc_ptr
, idt_desc
);
725 /* Set an IDT entry. If the entry is part of the current IDT, then
727 static void xen_write_idt_entry(gate_desc
*dt
, int entrynum
, const gate_desc
*g
)
729 unsigned long p
= (unsigned long)&dt
[entrynum
];
730 unsigned long start
, end
;
732 trace_xen_cpu_write_idt_entry(dt
, entrynum
, g
);
736 start
= __this_cpu_read(idt_desc
.address
);
737 end
= start
+ __this_cpu_read(idt_desc
.size
) + 1;
741 native_write_idt_entry(dt
, entrynum
, g
);
743 if (p
>= start
&& (p
+ 8) <= end
) {
744 struct trap_info info
[2];
748 if (cvt_gate_to_trap(entrynum
, g
, &info
[0]))
749 if (HYPERVISOR_set_trap_table(info
))
756 static void xen_convert_trap_info(const struct desc_ptr
*desc
,
757 struct trap_info
*traps
)
759 unsigned in
, out
, count
;
761 count
= (desc
->size
+1) / sizeof(gate_desc
);
764 for (in
= out
= 0; in
< count
; in
++) {
765 gate_desc
*entry
= (gate_desc
*)(desc
->address
) + in
;
767 if (cvt_gate_to_trap(in
, entry
, &traps
[out
]))
770 traps
[out
].address
= 0;
773 void xen_copy_trap_info(struct trap_info
*traps
)
775 const struct desc_ptr
*desc
= &__get_cpu_var(idt_desc
);
777 xen_convert_trap_info(desc
, traps
);
780 /* Load a new IDT into Xen. In principle this can be per-CPU, so we
781 hold a spinlock to protect the static traps[] array (static because
782 it avoids allocation, and saves stack space). */
783 static void xen_load_idt(const struct desc_ptr
*desc
)
785 static DEFINE_SPINLOCK(lock
);
786 static struct trap_info traps
[257];
788 trace_xen_cpu_load_idt(desc
);
792 __get_cpu_var(idt_desc
) = *desc
;
794 xen_convert_trap_info(desc
, traps
);
797 if (HYPERVISOR_set_trap_table(traps
))
803 /* Write a GDT descriptor entry. Ignore LDT descriptors, since
804 they're handled differently. */
805 static void xen_write_gdt_entry(struct desc_struct
*dt
, int entry
,
806 const void *desc
, int type
)
808 trace_xen_cpu_write_gdt_entry(dt
, entry
, desc
, type
);
819 xmaddr_t maddr
= arbitrary_virt_to_machine(&dt
[entry
]);
822 if (HYPERVISOR_update_descriptor(maddr
.maddr
, *(u64
*)desc
))
832 * Version of write_gdt_entry for use at early boot-time needed to
833 * update an entry as simply as possible.
835 static void __init
xen_write_gdt_entry_boot(struct desc_struct
*dt
, int entry
,
836 const void *desc
, int type
)
838 trace_xen_cpu_write_gdt_entry(dt
, entry
, desc
, type
);
847 xmaddr_t maddr
= virt_to_machine(&dt
[entry
]);
849 if (HYPERVISOR_update_descriptor(maddr
.maddr
, *(u64
*)desc
))
850 dt
[entry
] = *(struct desc_struct
*)desc
;
856 static void xen_load_sp0(struct tss_struct
*tss
,
857 struct thread_struct
*thread
)
859 struct multicall_space mcs
;
861 mcs
= xen_mc_entry(0);
862 MULTI_stack_switch(mcs
.mc
, __KERNEL_DS
, thread
->sp0
);
863 xen_mc_issue(PARAVIRT_LAZY_CPU
);
866 static void xen_set_iopl_mask(unsigned mask
)
868 struct physdev_set_iopl set_iopl
;
870 /* Force the change at ring 0. */
871 set_iopl
.iopl
= (mask
== 0) ? 1 : (mask
>> 12) & 3;
872 HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl
, &set_iopl
);
875 static void xen_io_delay(void)
879 #ifdef CONFIG_X86_LOCAL_APIC
880 static unsigned long xen_set_apic_id(unsigned int x
)
885 static unsigned int xen_get_apic_id(unsigned long x
)
887 return ((x
)>>24) & 0xFFu
;
889 static u32
xen_apic_read(u32 reg
)
891 struct xen_platform_op op
= {
892 .cmd
= XENPF_get_cpuinfo
,
893 .interface_version
= XENPF_INTERFACE_VERSION
,
894 .u
.pcpu_info
.xen_cpuid
= 0,
898 /* Shouldn't need this as APIC is turned off for PV, and we only
899 * get called on the bootup processor. But just in case. */
900 if (!xen_initial_domain() || smp_processor_id())
909 ret
= HYPERVISOR_dom0_op(&op
);
913 return op
.u
.pcpu_info
.apic_id
<< 24;
916 static void xen_apic_write(u32 reg
, u32 val
)
918 /* Warn to see if there's any stray references */
922 static u64
xen_apic_icr_read(void)
927 static void xen_apic_icr_write(u32 low
, u32 id
)
929 /* Warn to see if there's any stray references */
933 static void xen_apic_wait_icr_idle(void)
938 static u32
xen_safe_apic_wait_icr_idle(void)
943 static void set_xen_basic_apic_ops(void)
945 apic
->read
= xen_apic_read
;
946 apic
->write
= xen_apic_write
;
947 apic
->icr_read
= xen_apic_icr_read
;
948 apic
->icr_write
= xen_apic_icr_write
;
949 apic
->wait_icr_idle
= xen_apic_wait_icr_idle
;
950 apic
->safe_wait_icr_idle
= xen_safe_apic_wait_icr_idle
;
951 apic
->set_apic_id
= xen_set_apic_id
;
952 apic
->get_apic_id
= xen_get_apic_id
;
955 apic
->send_IPI_allbutself
= xen_send_IPI_allbutself
;
956 apic
->send_IPI_mask_allbutself
= xen_send_IPI_mask_allbutself
;
957 apic
->send_IPI_mask
= xen_send_IPI_mask
;
958 apic
->send_IPI_all
= xen_send_IPI_all
;
959 apic
->send_IPI_self
= xen_send_IPI_self
;
965 static void xen_clts(void)
967 struct multicall_space mcs
;
969 mcs
= xen_mc_entry(0);
971 MULTI_fpu_taskswitch(mcs
.mc
, 0);
973 xen_mc_issue(PARAVIRT_LAZY_CPU
);
976 static DEFINE_PER_CPU(unsigned long, xen_cr0_value
);
978 static unsigned long xen_read_cr0(void)
980 unsigned long cr0
= this_cpu_read(xen_cr0_value
);
982 if (unlikely(cr0
== 0)) {
983 cr0
= native_read_cr0();
984 this_cpu_write(xen_cr0_value
, cr0
);
990 static void xen_write_cr0(unsigned long cr0
)
992 struct multicall_space mcs
;
994 this_cpu_write(xen_cr0_value
, cr0
);
996 /* Only pay attention to cr0.TS; everything else is
998 mcs
= xen_mc_entry(0);
1000 MULTI_fpu_taskswitch(mcs
.mc
, (cr0
& X86_CR0_TS
) != 0);
1002 xen_mc_issue(PARAVIRT_LAZY_CPU
);
1005 static void xen_write_cr4(unsigned long cr4
)
1007 cr4
&= ~X86_CR4_PGE
;
1008 cr4
&= ~X86_CR4_PSE
;
1010 native_write_cr4(cr4
);
1012 #ifdef CONFIG_X86_64
1013 static inline unsigned long xen_read_cr8(void)
1017 static inline void xen_write_cr8(unsigned long val
)
1022 static int xen_write_msr_safe(unsigned int msr
, unsigned low
, unsigned high
)
1029 #ifdef CONFIG_X86_64
1033 case MSR_FS_BASE
: which
= SEGBASE_FS
; goto set
;
1034 case MSR_KERNEL_GS_BASE
: which
= SEGBASE_GS_USER
; goto set
;
1035 case MSR_GS_BASE
: which
= SEGBASE_GS_KERNEL
; goto set
;
1038 base
= ((u64
)high
<< 32) | low
;
1039 if (HYPERVISOR_set_segment_base(which
, base
) != 0)
1047 case MSR_SYSCALL_MASK
:
1048 case MSR_IA32_SYSENTER_CS
:
1049 case MSR_IA32_SYSENTER_ESP
:
1050 case MSR_IA32_SYSENTER_EIP
:
1051 /* Fast syscall setup is all done in hypercalls, so
1052 these are all ignored. Stub them out here to stop
1053 Xen console noise. */
1056 case MSR_IA32_CR_PAT
:
1057 if (smp_processor_id() == 0)
1058 xen_set_pat(((u64
)high
<< 32) | low
);
1062 ret
= native_write_msr_safe(msr
, low
, high
);
1068 void xen_setup_shared_info(void)
1070 if (!xen_feature(XENFEAT_auto_translated_physmap
)) {
1071 set_fixmap(FIX_PARAVIRT_BOOTMAP
,
1072 xen_start_info
->shared_info
);
1074 HYPERVISOR_shared_info
=
1075 (struct shared_info
*)fix_to_virt(FIX_PARAVIRT_BOOTMAP
);
1077 HYPERVISOR_shared_info
=
1078 (struct shared_info
*)__va(xen_start_info
->shared_info
);
1081 /* In UP this is as good a place as any to set up shared info */
1082 xen_setup_vcpu_info_placement();
1085 xen_setup_mfn_list_list();
1088 /* This is called once we have the cpu_possible_mask */
1089 void xen_setup_vcpu_info_placement(void)
1093 for_each_possible_cpu(cpu
)
1094 xen_vcpu_setup(cpu
);
1096 /* xen_vcpu_setup managed to place the vcpu_info within the
1097 percpu area for all cpus, so make use of it */
1098 if (have_vcpu_info_placement
) {
1099 pv_irq_ops
.save_fl
= __PV_IS_CALLEE_SAVE(xen_save_fl_direct
);
1100 pv_irq_ops
.restore_fl
= __PV_IS_CALLEE_SAVE(xen_restore_fl_direct
);
1101 pv_irq_ops
.irq_disable
= __PV_IS_CALLEE_SAVE(xen_irq_disable_direct
);
1102 pv_irq_ops
.irq_enable
= __PV_IS_CALLEE_SAVE(xen_irq_enable_direct
);
1103 pv_mmu_ops
.read_cr2
= xen_read_cr2_direct
;
1107 static unsigned xen_patch(u8 type
, u16 clobbers
, void *insnbuf
,
1108 unsigned long addr
, unsigned len
)
1110 char *start
, *end
, *reloc
;
1113 start
= end
= reloc
= NULL
;
1115 #define SITE(op, x) \
1116 case PARAVIRT_PATCH(op.x): \
1117 if (have_vcpu_info_placement) { \
1118 start = (char *)xen_##x##_direct; \
1119 end = xen_##x##_direct_end; \
1120 reloc = xen_##x##_direct_reloc; \
1125 SITE(pv_irq_ops
, irq_enable
);
1126 SITE(pv_irq_ops
, irq_disable
);
1127 SITE(pv_irq_ops
, save_fl
);
1128 SITE(pv_irq_ops
, restore_fl
);
1132 if (start
== NULL
|| (end
-start
) > len
)
1135 ret
= paravirt_patch_insns(insnbuf
, len
, start
, end
);
1137 /* Note: because reloc is assigned from something that
1138 appears to be an array, gcc assumes it's non-null,
1139 but doesn't know its relationship with start and
1141 if (reloc
> start
&& reloc
< end
) {
1142 int reloc_off
= reloc
- start
;
1143 long *relocp
= (long *)(insnbuf
+ reloc_off
);
1144 long delta
= start
- (char *)addr
;
1152 ret
= paravirt_patch_default(type
, clobbers
, insnbuf
,
1160 static const struct pv_info xen_info __initconst
= {
1161 .paravirt_enabled
= 1,
1162 .shared_kernel_pmd
= 0,
1164 #ifdef CONFIG_X86_64
1165 .extra_user_64bit_cs
= FLAT_USER_CS64
,
1171 static const struct pv_init_ops xen_init_ops __initconst
= {
1175 static const struct pv_cpu_ops xen_cpu_ops __initconst
= {
1178 .set_debugreg
= xen_set_debugreg
,
1179 .get_debugreg
= xen_get_debugreg
,
1183 .read_cr0
= xen_read_cr0
,
1184 .write_cr0
= xen_write_cr0
,
1186 .read_cr4
= native_read_cr4
,
1187 .read_cr4_safe
= native_read_cr4_safe
,
1188 .write_cr4
= xen_write_cr4
,
1190 #ifdef CONFIG_X86_64
1191 .read_cr8
= xen_read_cr8
,
1192 .write_cr8
= xen_write_cr8
,
1195 .wbinvd
= native_wbinvd
,
1197 .read_msr
= native_read_msr_safe
,
1198 .write_msr
= xen_write_msr_safe
,
1200 .read_tsc
= native_read_tsc
,
1201 .read_pmc
= native_read_pmc
,
1203 .read_tscp
= native_read_tscp
,
1206 .irq_enable_sysexit
= xen_sysexit
,
1207 #ifdef CONFIG_X86_64
1208 .usergs_sysret32
= xen_sysret32
,
1209 .usergs_sysret64
= xen_sysret64
,
1212 .load_tr_desc
= paravirt_nop
,
1213 .set_ldt
= xen_set_ldt
,
1214 .load_gdt
= xen_load_gdt
,
1215 .load_idt
= xen_load_idt
,
1216 .load_tls
= xen_load_tls
,
1217 #ifdef CONFIG_X86_64
1218 .load_gs_index
= xen_load_gs_index
,
1221 .alloc_ldt
= xen_alloc_ldt
,
1222 .free_ldt
= xen_free_ldt
,
1224 .store_idt
= native_store_idt
,
1225 .store_tr
= xen_store_tr
,
1227 .write_ldt_entry
= xen_write_ldt_entry
,
1228 .write_gdt_entry
= xen_write_gdt_entry
,
1229 .write_idt_entry
= xen_write_idt_entry
,
1230 .load_sp0
= xen_load_sp0
,
1232 .set_iopl_mask
= xen_set_iopl_mask
,
1233 .io_delay
= xen_io_delay
,
1235 /* Xen takes care of %gs when switching to usermode for us */
1236 .swapgs
= paravirt_nop
,
1238 .start_context_switch
= paravirt_start_context_switch
,
1239 .end_context_switch
= xen_end_context_switch
,
1242 static const struct pv_apic_ops xen_apic_ops __initconst
= {
1243 #ifdef CONFIG_X86_LOCAL_APIC
1244 .startup_ipi_hook
= paravirt_nop
,
1248 static void xen_reboot(int reason
)
1250 struct sched_shutdown r
= { .reason
= reason
};
1252 if (HYPERVISOR_sched_op(SCHEDOP_shutdown
, &r
))
1256 static void xen_restart(char *msg
)
1258 xen_reboot(SHUTDOWN_reboot
);
1261 static void xen_emergency_restart(void)
1263 xen_reboot(SHUTDOWN_reboot
);
1266 static void xen_machine_halt(void)
1268 xen_reboot(SHUTDOWN_poweroff
);
1271 static void xen_machine_power_off(void)
1275 xen_reboot(SHUTDOWN_poweroff
);
1278 static void xen_crash_shutdown(struct pt_regs
*regs
)
1280 xen_reboot(SHUTDOWN_crash
);
1284 xen_panic_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1286 xen_reboot(SHUTDOWN_crash
);
1290 static struct notifier_block xen_panic_block
= {
1291 .notifier_call
= xen_panic_event
,
1294 int xen_panic_handler_init(void)
1296 atomic_notifier_chain_register(&panic_notifier_list
, &xen_panic_block
);
1300 static const struct machine_ops xen_machine_ops __initconst
= {
1301 .restart
= xen_restart
,
1302 .halt
= xen_machine_halt
,
1303 .power_off
= xen_machine_power_off
,
1304 .shutdown
= xen_machine_halt
,
1305 .crash_shutdown
= xen_crash_shutdown
,
1306 .emergency_restart
= xen_emergency_restart
,
1309 static void __init
xen_boot_params_init_edd(void)
1311 #if IS_ENABLED(CONFIG_EDD)
1312 struct xen_platform_op op
;
1313 struct edd_info
*edd_info
;
1318 edd_info
= boot_params
.eddbuf
;
1319 mbr_signature
= boot_params
.edd_mbr_sig_buffer
;
1321 op
.cmd
= XENPF_firmware_info
;
1323 op
.u
.firmware_info
.type
= XEN_FW_DISK_INFO
;
1324 for (nr
= 0; nr
< EDDMAXNR
; nr
++) {
1325 struct edd_info
*info
= edd_info
+ nr
;
1327 op
.u
.firmware_info
.index
= nr
;
1328 info
->params
.length
= sizeof(info
->params
);
1329 set_xen_guest_handle(op
.u
.firmware_info
.u
.disk_info
.edd_params
,
1331 ret
= HYPERVISOR_dom0_op(&op
);
1335 #define C(x) info->x = op.u.firmware_info.u.disk_info.x
1338 C(interface_support
);
1339 C(legacy_max_cylinder
);
1341 C(legacy_sectors_per_track
);
1344 boot_params
.eddbuf_entries
= nr
;
1346 op
.u
.firmware_info
.type
= XEN_FW_DISK_MBR_SIGNATURE
;
1347 for (nr
= 0; nr
< EDD_MBR_SIG_MAX
; nr
++) {
1348 op
.u
.firmware_info
.index
= nr
;
1349 ret
= HYPERVISOR_dom0_op(&op
);
1352 mbr_signature
[nr
] = op
.u
.firmware_info
.u
.disk_mbr_signature
.mbr_signature
;
1354 boot_params
.edd_mbr_sig_buf_entries
= nr
;
1359 * Set up the GDT and segment registers for -fstack-protector. Until
1360 * we do this, we have to be careful not to call any stack-protected
1361 * function, which is most of the kernel.
1363 static void __init
xen_setup_stackprotector(void)
1365 pv_cpu_ops
.write_gdt_entry
= xen_write_gdt_entry_boot
;
1366 pv_cpu_ops
.load_gdt
= xen_load_gdt_boot
;
1368 setup_stack_canary_segment(0);
1369 switch_to_new_gdt(0);
1371 pv_cpu_ops
.write_gdt_entry
= xen_write_gdt_entry
;
1372 pv_cpu_ops
.load_gdt
= xen_load_gdt
;
1375 /* First C function to be called on Xen boot */
1376 asmlinkage
void __init
xen_start_kernel(void)
1378 struct physdev_set_iopl set_iopl
;
1381 if (!xen_start_info
)
1384 xen_domain_type
= XEN_PV_DOMAIN
;
1386 xen_setup_machphys_mapping();
1388 /* Install Xen paravirt ops */
1390 pv_init_ops
= xen_init_ops
;
1391 pv_cpu_ops
= xen_cpu_ops
;
1392 pv_apic_ops
= xen_apic_ops
;
1394 x86_init
.resources
.memory_setup
= xen_memory_setup
;
1395 x86_init
.oem
.arch_setup
= xen_arch_setup
;
1396 x86_init
.oem
.banner
= xen_banner
;
1398 xen_init_time_ops();
1401 * Set up some pagetable state before starting to set any ptes.
1406 /* Prevent unwanted bits from being set in PTEs. */
1407 __supported_pte_mask
&= ~_PAGE_GLOBAL
;
1409 if (!xen_initial_domain())
1411 __supported_pte_mask
&= ~(_PAGE_PWT
| _PAGE_PCD
);
1413 __supported_pte_mask
|= _PAGE_IOMAP
;
1416 * Prevent page tables from being allocated in highmem, even
1417 * if CONFIG_HIGHPTE is enabled.
1419 __userpte_alloc_gfp
&= ~__GFP_HIGHMEM
;
1421 /* Work out if we support NX */
1424 xen_setup_features();
1427 if (!xen_feature(XENFEAT_auto_translated_physmap
))
1428 xen_build_dynamic_phys_to_machine();
1431 * Set up kernel GDT and segment registers, mainly so that
1432 * -fstack-protector code can be executed.
1434 xen_setup_stackprotector();
1437 xen_init_cpuid_mask();
1439 #ifdef CONFIG_X86_LOCAL_APIC
1441 * set up the basic apic ops.
1443 set_xen_basic_apic_ops();
1446 if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad
)) {
1447 pv_mmu_ops
.ptep_modify_prot_start
= xen_ptep_modify_prot_start
;
1448 pv_mmu_ops
.ptep_modify_prot_commit
= xen_ptep_modify_prot_commit
;
1451 machine_ops
= xen_machine_ops
;
1454 * The only reliable way to retain the initial address of the
1455 * percpu gdt_page is to remember it here, so we can go and
1456 * mark it RW later, when the initial percpu area is freed.
1458 xen_initial_gdt
= &per_cpu(gdt_page
, 0);
1462 #ifdef CONFIG_ACPI_NUMA
1464 * The pages we from Xen are not related to machine pages, so
1465 * any NUMA information the kernel tries to get from ACPI will
1466 * be meaningless. Prevent it from trying.
1470 #ifdef CONFIG_X86_PAT
1472 * For right now disable the PAT. We should remove this once
1473 * git commit 8eaffa67b43e99ae581622c5133e20b0f48bcef1
1474 * (xen/pat: Disable PAT support for now) is reverted.
1478 /* Don't do the full vcpu_info placement stuff until we have a
1479 possible map and a non-dummy shared_info. */
1480 per_cpu(xen_vcpu
, 0) = &HYPERVISOR_shared_info
->vcpu_info
[0];
1482 local_irq_disable();
1483 early_boot_irqs_disabled
= true;
1485 xen_raw_console_write("mapping kernel into physical memory\n");
1486 xen_setup_kernel_pagetable((pgd_t
*)xen_start_info
->pt_base
, xen_start_info
->nr_pages
);
1488 /* Allocate and initialize top and mid mfn levels for p2m structure */
1489 xen_build_mfn_list_list();
1491 /* keep using Xen gdt for now; no urgent need to change it */
1493 #ifdef CONFIG_X86_32
1494 pv_info
.kernel_rpl
= 1;
1495 if (xen_feature(XENFEAT_supervisor_mode_kernel
))
1496 pv_info
.kernel_rpl
= 0;
1498 pv_info
.kernel_rpl
= 0;
1500 /* set the limit of our address space */
1503 /* We used to do this in xen_arch_setup, but that is too late on AMD
1504 * were early_cpu_init (run before ->arch_setup()) calls early_amd_init
1505 * which pokes 0xcf8 port.
1508 rc
= HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl
, &set_iopl
);
1510 xen_raw_printk("physdev_op failed %d\n", rc
);
1512 #ifdef CONFIG_X86_32
1513 /* set up basic CPUID stuff */
1514 cpu_detect(&new_cpu_data
);
1515 new_cpu_data
.hard_math
= 1;
1516 new_cpu_data
.wp_works_ok
= 1;
1517 new_cpu_data
.x86_capability
[0] = cpuid_edx(1);
1520 /* Poke various useful things into boot_params */
1521 boot_params
.hdr
.type_of_loader
= (9 << 4) | 0;
1522 boot_params
.hdr
.ramdisk_image
= xen_start_info
->mod_start
1523 ? __pa(xen_start_info
->mod_start
) : 0;
1524 boot_params
.hdr
.ramdisk_size
= xen_start_info
->mod_len
;
1525 boot_params
.hdr
.cmd_line_ptr
= __pa(xen_start_info
->cmd_line
);
1527 if (!xen_initial_domain()) {
1528 add_preferred_console("xenboot", 0, NULL
);
1529 add_preferred_console("tty", 0, NULL
);
1530 add_preferred_console("hvc", 0, NULL
);
1532 x86_init
.pci
.arch_init
= pci_xen_init
;
1534 const struct dom0_vga_console_info
*info
=
1535 (void *)((char *)xen_start_info
+
1536 xen_start_info
->console
.dom0
.info_off
);
1537 struct xen_platform_op op
= {
1538 .cmd
= XENPF_firmware_info
,
1539 .interface_version
= XENPF_INTERFACE_VERSION
,
1540 .u
.firmware_info
.type
= XEN_FW_KBD_SHIFT_FLAGS
,
1543 xen_init_vga(info
, xen_start_info
->console
.dom0
.info_size
);
1544 xen_start_info
->console
.domU
.mfn
= 0;
1545 xen_start_info
->console
.domU
.evtchn
= 0;
1547 if (HYPERVISOR_dom0_op(&op
) == 0)
1548 boot_params
.kbd_status
= op
.u
.firmware_info
.u
.kbd_shift_flags
;
1552 /* Make sure ACS will be enabled */
1555 xen_acpi_sleep_register();
1557 /* Avoid searching for BIOS MP tables */
1558 x86_init
.mpparse
.find_smp_config
= x86_init_noop
;
1559 x86_init
.mpparse
.get_smp_config
= x86_init_uint_noop
;
1561 xen_boot_params_init_edd();
1564 /* PCI BIOS service won't work from a PV guest. */
1565 pci_probe
&= ~PCI_PROBE_BIOS
;
1567 xen_raw_console_write("about to get started...\n");
1569 xen_setup_runstate_info(0);
1571 /* Start the world */
1572 #ifdef CONFIG_X86_32
1573 i386_start_kernel();
1575 x86_64_start_reservations((char *)__pa_symbol(&boot_params
));
1579 void __ref
xen_hvm_init_shared_info(void)
1582 struct xen_add_to_physmap xatp
;
1583 static struct shared_info
*shared_info_page
= 0;
1585 if (!shared_info_page
)
1586 shared_info_page
= (struct shared_info
*)
1587 extend_brk(PAGE_SIZE
, PAGE_SIZE
);
1588 xatp
.domid
= DOMID_SELF
;
1590 xatp
.space
= XENMAPSPACE_shared_info
;
1591 xatp
.gpfn
= __pa(shared_info_page
) >> PAGE_SHIFT
;
1592 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap
, &xatp
))
1595 HYPERVISOR_shared_info
= (struct shared_info
*)shared_info_page
;
1597 /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
1598 * page, we use it in the event channel upcall and in some pvclock
1599 * related functions. We don't need the vcpu_info placement
1600 * optimizations because we don't use any pv_mmu or pv_irq op on
1602 * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
1603 * online but xen_hvm_init_shared_info is run at resume time too and
1604 * in that case multiple vcpus might be online. */
1605 for_each_online_cpu(cpu
) {
1606 per_cpu(xen_vcpu
, cpu
) = &HYPERVISOR_shared_info
->vcpu_info
[cpu
];
1610 #ifdef CONFIG_XEN_PVHVM
1611 static void __init
init_hvm_pv_info(void)
1614 uint32_t eax
, ebx
, ecx
, edx
, pages
, msr
, base
;
1617 base
= xen_cpuid_base();
1618 cpuid(base
+ 1, &eax
, &ebx
, &ecx
, &edx
);
1621 minor
= eax
& 0xffff;
1622 printk(KERN_INFO
"Xen version %d.%d.\n", major
, minor
);
1624 cpuid(base
+ 2, &pages
, &msr
, &ecx
, &edx
);
1626 pfn
= __pa(hypercall_page
);
1627 wrmsr_safe(msr
, (u32
)pfn
, (u32
)(pfn
>> 32));
1629 xen_setup_features();
1631 pv_info
.name
= "Xen HVM";
1633 xen_domain_type
= XEN_HVM_DOMAIN
;
1636 static int __cpuinit
xen_hvm_cpu_notify(struct notifier_block
*self
,
1637 unsigned long action
, void *hcpu
)
1639 int cpu
= (long)hcpu
;
1641 case CPU_UP_PREPARE
:
1642 xen_vcpu_setup(cpu
);
1643 if (xen_have_vector_callback
) {
1644 xen_init_lock_cpu(cpu
);
1645 if (xen_feature(XENFEAT_hvm_safe_pvclock
))
1646 xen_setup_timer(cpu
);
1655 static struct notifier_block xen_hvm_cpu_notifier __cpuinitdata
= {
1656 .notifier_call
= xen_hvm_cpu_notify
,
1659 static void __init
xen_hvm_guest_init(void)
1663 xen_hvm_init_shared_info();
1665 if (xen_feature(XENFEAT_hvm_callback_vector
))
1666 xen_have_vector_callback
= 1;
1668 register_cpu_notifier(&xen_hvm_cpu_notifier
);
1669 xen_unplug_emulated_devices();
1670 x86_init
.irqs
.intr_init
= xen_init_IRQ
;
1671 xen_hvm_init_time_ops();
1672 xen_hvm_init_mmu_ops();
1675 static bool __init
xen_hvm_platform(void)
1677 if (xen_pv_domain())
1680 if (!xen_cpuid_base())
1686 bool xen_hvm_need_lapic(void)
1688 if (xen_pv_domain())
1690 if (!xen_hvm_domain())
1692 if (xen_feature(XENFEAT_hvm_pirqs
) && xen_have_vector_callback
)
1696 EXPORT_SYMBOL_GPL(xen_hvm_need_lapic
);
1698 const struct hypervisor_x86 x86_hyper_xen_hvm __refconst
= {
1700 .detect
= xen_hvm_platform
,
1701 .init_platform
= xen_hvm_guest_init
,
1702 .x2apic_available
= xen_x2apic_para_available
,
1704 EXPORT_SYMBOL(x86_hyper_xen_hvm
);