2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 #include <linux/cpu.h>
20 #include <linux/cpu_pm.h>
21 #include <linux/errno.h>
22 #include <linux/err.h>
23 #include <linux/kvm_host.h>
24 #include <linux/module.h>
25 #include <linux/vmalloc.h>
27 #include <linux/mman.h>
28 #include <linux/sched.h>
29 #include <linux/kvm.h>
30 #include <trace/events/kvm.h>
32 #define CREATE_TRACE_POINTS
35 #include <asm/uaccess.h>
36 #include <asm/ptrace.h>
38 #include <asm/tlbflush.h>
39 #include <asm/cacheflush.h>
41 #include <asm/kvm_arm.h>
42 #include <asm/kvm_asm.h>
43 #include <asm/kvm_mmu.h>
44 #include <asm/kvm_emulate.h>
45 #include <asm/kvm_coproc.h>
46 #include <asm/kvm_psci.h>
49 __asm__(".arch_extension virt");
52 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page
);
53 static kvm_cpu_context_t __percpu
*kvm_host_cpu_state
;
54 static unsigned long hyp_default_vectors
;
56 /* Per-CPU variable containing the currently running vcpu. */
57 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_arm_running_vcpu
);
59 /* The VMID used in the VTTBR */
60 static atomic64_t kvm_vmid_gen
= ATOMIC64_INIT(1);
61 static u8 kvm_next_vmid
;
62 static DEFINE_SPINLOCK(kvm_vmid_lock
);
64 static bool vgic_present
;
66 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
68 BUG_ON(preemptible());
69 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
73 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
74 * Must be called from non-preemptible context
76 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
78 BUG_ON(preemptible());
79 return __this_cpu_read(kvm_arm_running_vcpu
);
83 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
85 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
87 return &kvm_arm_running_vcpu
;
90 int kvm_arch_hardware_enable(void)
95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
97 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
100 int kvm_arch_hardware_setup(void)
105 void kvm_arch_check_processor_compat(void *rtn
)
112 * kvm_arch_init_vm - initializes a VM data structure
113 * @kvm: pointer to the KVM struct
115 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
122 ret
= kvm_alloc_stage2_pgd(kvm
);
126 ret
= create_hyp_mappings(kvm
, kvm
+ 1);
128 goto out_free_stage2_pgd
;
132 /* Mark the initial VMID generation invalid */
133 kvm
->arch
.vmid_gen
= 0;
137 kvm_free_stage2_pgd(kvm
);
142 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
144 return VM_FAULT_SIGBUS
;
149 * kvm_arch_destroy_vm - destroy the VM data structure
150 * @kvm: pointer to the KVM struct
152 void kvm_arch_destroy_vm(struct kvm
*kvm
)
156 kvm_free_stage2_pgd(kvm
);
158 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
160 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
161 kvm
->vcpus
[i
] = NULL
;
165 kvm_vgic_destroy(kvm
);
168 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
172 case KVM_CAP_IRQCHIP
:
175 case KVM_CAP_DEVICE_CTRL
:
176 case KVM_CAP_USER_MEMORY
:
177 case KVM_CAP_SYNC_MMU
:
178 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
179 case KVM_CAP_ONE_REG
:
180 case KVM_CAP_ARM_PSCI
:
181 case KVM_CAP_ARM_PSCI_0_2
:
182 case KVM_CAP_READONLY_MEM
:
185 case KVM_CAP_COALESCED_MMIO
:
186 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
188 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
191 case KVM_CAP_NR_VCPUS
:
192 r
= num_online_cpus();
194 case KVM_CAP_MAX_VCPUS
:
198 r
= kvm_arch_dev_ioctl_check_extension(ext
);
204 long kvm_arch_dev_ioctl(struct file
*filp
,
205 unsigned int ioctl
, unsigned long arg
)
211 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
214 struct kvm_vcpu
*vcpu
;
216 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
)) {
221 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
227 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
231 err
= create_hyp_mappings(vcpu
, vcpu
+ 1);
237 kvm_vcpu_uninit(vcpu
);
239 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
244 int kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
249 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
251 kvm_mmu_free_memory_caches(vcpu
);
252 kvm_timer_vcpu_terminate(vcpu
);
253 kvm_vgic_vcpu_destroy(vcpu
);
254 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
257 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
259 kvm_arch_vcpu_free(vcpu
);
262 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
267 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
269 /* Force users to call KVM_ARM_VCPU_INIT */
270 vcpu
->arch
.target
= -1;
271 bitmap_zero(vcpu
->arch
.features
, KVM_VCPU_MAX_FEATURES
);
273 /* Set up the timer */
274 kvm_timer_vcpu_init(vcpu
);
279 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
282 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(kvm_host_cpu_state
);
284 kvm_arm_set_running_vcpu(vcpu
);
287 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
290 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
291 * if the vcpu is no longer assigned to a cpu. This is used for the
292 * optimized make_all_cpus_request path.
296 kvm_arm_set_running_vcpu(NULL
);
299 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
*vcpu
,
300 struct kvm_guest_debug
*dbg
)
306 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
307 struct kvm_mp_state
*mp_state
)
312 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
313 struct kvm_mp_state
*mp_state
)
319 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
320 * @v: The VCPU pointer
322 * If the guest CPU is not waiting for interrupts or an interrupt line is
323 * asserted, the CPU is by definition runnable.
325 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
327 return !!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
);
330 /* Just ensure a guest exit from a particular CPU */
331 static void exit_vm_noop(void *info
)
335 void force_vm_exit(const cpumask_t
*mask
)
337 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
341 * need_new_vmid_gen - check that the VMID is still valid
342 * @kvm: The VM's VMID to checkt
344 * return true if there is a new generation of VMIDs being used
346 * The hardware supports only 256 values with the value zero reserved for the
347 * host, so we check if an assigned value belongs to a previous generation,
348 * which which requires us to assign a new value. If we're the first to use a
349 * VMID for the new generation, we must flush necessary caches and TLBs on all
352 static bool need_new_vmid_gen(struct kvm
*kvm
)
354 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
358 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
359 * @kvm The guest that we are about to run
361 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
362 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
365 static void update_vttbr(struct kvm
*kvm
)
367 phys_addr_t pgd_phys
;
370 if (!need_new_vmid_gen(kvm
))
373 spin_lock(&kvm_vmid_lock
);
376 * We need to re-check the vmid_gen here to ensure that if another vcpu
377 * already allocated a valid vmid for this vm, then this vcpu should
380 if (!need_new_vmid_gen(kvm
)) {
381 spin_unlock(&kvm_vmid_lock
);
385 /* First user of a new VMID generation? */
386 if (unlikely(kvm_next_vmid
== 0)) {
387 atomic64_inc(&kvm_vmid_gen
);
391 * On SMP we know no other CPUs can use this CPU's or each
392 * other's VMID after force_vm_exit returns since the
393 * kvm_vmid_lock blocks them from reentry to the guest.
395 force_vm_exit(cpu_all_mask
);
397 * Now broadcast TLB + ICACHE invalidation over the inner
398 * shareable domain to make sure all data structures are
401 kvm_call_hyp(__kvm_flush_vm_context
);
404 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
405 kvm
->arch
.vmid
= kvm_next_vmid
;
408 /* update vttbr to be used with the new vmid */
409 pgd_phys
= virt_to_phys(kvm_get_hwpgd(kvm
));
410 BUG_ON(pgd_phys
& ~VTTBR_BADDR_MASK
);
411 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK
;
412 kvm
->arch
.vttbr
= pgd_phys
| vmid
;
414 spin_unlock(&kvm_vmid_lock
);
417 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
419 struct kvm
*kvm
= vcpu
->kvm
;
422 if (likely(vcpu
->arch
.has_run_once
))
425 vcpu
->arch
.has_run_once
= true;
428 * Map the VGIC hardware resources before running a vcpu the first
431 if (unlikely(!vgic_ready(kvm
))) {
432 ret
= kvm_vgic_map_resources(kvm
);
438 * Enable the arch timers only if we have an in-kernel VGIC
439 * and it has been properly initialized, since we cannot handle
440 * interrupts from the virtual timer with a userspace gic.
442 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
))
443 kvm_timer_enable(kvm
);
448 static void vcpu_pause(struct kvm_vcpu
*vcpu
)
450 wait_queue_head_t
*wq
= kvm_arch_vcpu_wq(vcpu
);
452 wait_event_interruptible(*wq
, !vcpu
->arch
.pause
);
455 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
457 return vcpu
->arch
.target
>= 0;
461 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
462 * @vcpu: The VCPU pointer
463 * @run: The kvm_run structure pointer used for userspace state exchange
465 * This function is called through the VCPU_RUN ioctl called from user space. It
466 * will execute VM code in a loop until the time slice for the process is used
467 * or some emulation is needed from user space in which case the function will
468 * return with return value 0 and with the kvm_run structure filled in with the
469 * required data for the requested emulation.
471 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
476 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
479 ret
= kvm_vcpu_first_run_init(vcpu
);
483 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
484 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
489 if (vcpu
->sigset_active
)
490 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
493 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
496 * Check conditions before entering the guest
500 update_vttbr(vcpu
->kvm
);
502 if (vcpu
->arch
.pause
)
505 kvm_vgic_flush_hwstate(vcpu
);
506 kvm_timer_flush_hwstate(vcpu
);
511 * Re-check atomic conditions
513 if (signal_pending(current
)) {
515 run
->exit_reason
= KVM_EXIT_INTR
;
518 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
)) {
520 kvm_timer_sync_hwstate(vcpu
);
521 kvm_vgic_sync_hwstate(vcpu
);
525 /**************************************************************
528 trace_kvm_entry(*vcpu_pc(vcpu
));
530 vcpu
->mode
= IN_GUEST_MODE
;
532 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
534 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
536 trace_kvm_exit(*vcpu_pc(vcpu
));
538 * We may have taken a host interrupt in HYP mode (ie
539 * while executing the guest). This interrupt is still
540 * pending, as we haven't serviced it yet!
542 * We're now back in SVC mode, with interrupts
543 * disabled. Enabling the interrupts now will have
544 * the effect of taking the interrupt again, in SVC
551 *************************************************************/
553 kvm_timer_sync_hwstate(vcpu
);
554 kvm_vgic_sync_hwstate(vcpu
);
556 ret
= handle_exit(vcpu
, run
, ret
);
559 if (vcpu
->sigset_active
)
560 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
564 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
570 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
571 bit_index
= __ffs(HCR_VI
);
572 else /* KVM_ARM_IRQ_CPU_FIQ */
573 bit_index
= __ffs(HCR_VF
);
575 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
577 set
= test_and_set_bit(bit_index
, ptr
);
579 set
= test_and_clear_bit(bit_index
, ptr
);
582 * If we didn't change anything, no need to wake up or kick other CPUs
588 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
589 * trigger a world-switch round on the running physical CPU to set the
590 * virtual IRQ/FIQ fields in the HCR appropriately.
597 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
600 u32 irq
= irq_level
->irq
;
601 unsigned int irq_type
, vcpu_idx
, irq_num
;
602 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
603 struct kvm_vcpu
*vcpu
= NULL
;
604 bool level
= irq_level
->level
;
606 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
607 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
608 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
610 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
613 case KVM_ARM_IRQ_TYPE_CPU
:
614 if (irqchip_in_kernel(kvm
))
617 if (vcpu_idx
>= nrcpus
)
620 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
624 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
627 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
628 case KVM_ARM_IRQ_TYPE_PPI
:
629 if (!irqchip_in_kernel(kvm
))
632 if (vcpu_idx
>= nrcpus
)
635 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
639 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
642 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
643 case KVM_ARM_IRQ_TYPE_SPI
:
644 if (!irqchip_in_kernel(kvm
))
647 if (irq_num
< VGIC_NR_PRIVATE_IRQS
||
648 irq_num
> KVM_ARM_IRQ_GIC_MAX
)
651 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
657 static int kvm_vcpu_set_target(struct kvm_vcpu
*vcpu
,
658 const struct kvm_vcpu_init
*init
)
661 int phys_target
= kvm_target_cpu();
663 if (init
->target
!= phys_target
)
667 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
668 * use the same target.
670 if (vcpu
->arch
.target
!= -1 && vcpu
->arch
.target
!= init
->target
)
673 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
674 for (i
= 0; i
< sizeof(init
->features
) * 8; i
++) {
675 bool set
= (init
->features
[i
/ 32] & (1 << (i
% 32)));
677 if (set
&& i
>= KVM_VCPU_MAX_FEATURES
)
681 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
682 * use the same feature set.
684 if (vcpu
->arch
.target
!= -1 && i
< KVM_VCPU_MAX_FEATURES
&&
685 test_bit(i
, vcpu
->arch
.features
) != set
)
689 set_bit(i
, vcpu
->arch
.features
);
692 vcpu
->arch
.target
= phys_target
;
694 /* Now we know what it is, we can reset it. */
695 return kvm_reset_vcpu(vcpu
);
699 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
700 struct kvm_vcpu_init
*init
)
704 ret
= kvm_vcpu_set_target(vcpu
, init
);
709 * Ensure a rebooted VM will fault in RAM pages and detect if the
710 * guest MMU is turned off and flush the caches as needed.
712 if (vcpu
->arch
.has_run_once
)
713 stage2_unmap_vm(vcpu
->kvm
);
715 vcpu_reset_hcr(vcpu
);
718 * Handle the "start in power-off" case by marking the VCPU as paused.
720 if (test_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
721 vcpu
->arch
.pause
= true;
723 vcpu
->arch
.pause
= false;
728 long kvm_arch_vcpu_ioctl(struct file
*filp
,
729 unsigned int ioctl
, unsigned long arg
)
731 struct kvm_vcpu
*vcpu
= filp
->private_data
;
732 void __user
*argp
= (void __user
*)arg
;
735 case KVM_ARM_VCPU_INIT
: {
736 struct kvm_vcpu_init init
;
738 if (copy_from_user(&init
, argp
, sizeof(init
)))
741 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
743 case KVM_SET_ONE_REG
:
744 case KVM_GET_ONE_REG
: {
745 struct kvm_one_reg reg
;
747 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
750 if (copy_from_user(®
, argp
, sizeof(reg
)))
752 if (ioctl
== KVM_SET_ONE_REG
)
753 return kvm_arm_set_reg(vcpu
, ®
);
755 return kvm_arm_get_reg(vcpu
, ®
);
757 case KVM_GET_REG_LIST
: {
758 struct kvm_reg_list __user
*user_list
= argp
;
759 struct kvm_reg_list reg_list
;
762 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
765 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
768 reg_list
.n
= kvm_arm_num_regs(vcpu
);
769 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
773 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
780 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
785 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
786 struct kvm_arm_device_addr
*dev_addr
)
788 unsigned long dev_id
, type
;
790 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
791 KVM_ARM_DEVICE_ID_SHIFT
;
792 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
793 KVM_ARM_DEVICE_TYPE_SHIFT
;
796 case KVM_ARM_DEVICE_VGIC_V2
:
799 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
805 long kvm_arch_vm_ioctl(struct file
*filp
,
806 unsigned int ioctl
, unsigned long arg
)
808 struct kvm
*kvm
= filp
->private_data
;
809 void __user
*argp
= (void __user
*)arg
;
812 case KVM_CREATE_IRQCHIP
: {
814 return kvm_vgic_create(kvm
);
818 case KVM_ARM_SET_DEVICE_ADDR
: {
819 struct kvm_arm_device_addr dev_addr
;
821 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
823 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
825 case KVM_ARM_PREFERRED_TARGET
: {
827 struct kvm_vcpu_init init
;
829 err
= kvm_vcpu_preferred_target(&init
);
833 if (copy_to_user(argp
, &init
, sizeof(init
)))
843 static void cpu_init_hyp_mode(void *dummy
)
845 phys_addr_t boot_pgd_ptr
;
847 unsigned long hyp_stack_ptr
;
848 unsigned long stack_page
;
849 unsigned long vector_ptr
;
851 /* Switch from the HYP stub to our own HYP init vector */
852 __hyp_set_vectors(kvm_get_idmap_vector());
854 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
855 pgd_ptr
= kvm_mmu_get_httbr();
856 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
857 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
858 vector_ptr
= (unsigned long)__kvm_hyp_vector
;
860 __cpu_init_hyp_mode(boot_pgd_ptr
, pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
863 static int hyp_init_cpu_notify(struct notifier_block
*self
,
864 unsigned long action
, void *cpu
)
868 case CPU_STARTING_FROZEN
:
869 if (__hyp_get_vectors() == hyp_default_vectors
)
870 cpu_init_hyp_mode(NULL
);
877 static struct notifier_block hyp_init_cpu_nb
= {
878 .notifier_call
= hyp_init_cpu_notify
,
882 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
886 if (cmd
== CPU_PM_EXIT
&&
887 __hyp_get_vectors() == hyp_default_vectors
) {
888 cpu_init_hyp_mode(NULL
);
895 static struct notifier_block hyp_init_cpu_pm_nb
= {
896 .notifier_call
= hyp_init_cpu_pm_notifier
,
899 static void __init
hyp_cpu_pm_init(void)
901 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
904 static inline void hyp_cpu_pm_init(void)
910 * Inits Hyp-mode on all online CPUs
912 static int init_hyp_mode(void)
918 * Allocate Hyp PGD and setup Hyp identity mapping
920 err
= kvm_mmu_init();
925 * It is probably enough to obtain the default on one
926 * CPU. It's unlikely to be different on the others.
928 hyp_default_vectors
= __hyp_get_vectors();
931 * Allocate stack pages for Hypervisor-mode
933 for_each_possible_cpu(cpu
) {
934 unsigned long stack_page
;
936 stack_page
= __get_free_page(GFP_KERNEL
);
939 goto out_free_stack_pages
;
942 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
946 * Map the Hyp-code called directly from the host
948 err
= create_hyp_mappings(__kvm_hyp_code_start
, __kvm_hyp_code_end
);
950 kvm_err("Cannot map world-switch code\n");
951 goto out_free_mappings
;
955 * Map the Hyp stack pages
957 for_each_possible_cpu(cpu
) {
958 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
959 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
);
962 kvm_err("Cannot map hyp stack\n");
963 goto out_free_mappings
;
968 * Map the host CPU structures
970 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
971 if (!kvm_host_cpu_state
) {
973 kvm_err("Cannot allocate host CPU state\n");
974 goto out_free_mappings
;
977 for_each_possible_cpu(cpu
) {
978 kvm_cpu_context_t
*cpu_ctxt
;
980 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
981 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1);
984 kvm_err("Cannot map host CPU state: %d\n", err
);
985 goto out_free_context
;
990 * Execute the init code on each CPU.
992 on_each_cpu(cpu_init_hyp_mode
, NULL
, 1);
995 * Init HYP view of VGIC
997 err
= kvm_vgic_hyp_init();
999 goto out_free_context
;
1001 #ifdef CONFIG_KVM_ARM_VGIC
1002 vgic_present
= true;
1006 * Init HYP architected timer support
1008 err
= kvm_timer_hyp_init();
1010 goto out_free_mappings
;
1012 #ifndef CONFIG_HOTPLUG_CPU
1013 free_boot_hyp_pgd();
1018 kvm_info("Hyp mode initialized successfully\n");
1022 free_percpu(kvm_host_cpu_state
);
1025 out_free_stack_pages
:
1026 for_each_possible_cpu(cpu
)
1027 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
1029 kvm_err("error initializing Hyp mode: %d\n", err
);
1033 static void check_kvm_target_cpu(void *ret
)
1035 *(int *)ret
= kvm_target_cpu();
1039 * Initialize Hyp-mode and memory mappings on all CPUs.
1041 int kvm_arch_init(void *opaque
)
1046 if (!is_hyp_mode_available()) {
1047 kvm_err("HYP mode not available\n");
1051 for_each_online_cpu(cpu
) {
1052 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1054 kvm_err("Error, CPU %d not supported!\n", cpu
);
1059 cpu_notifier_register_begin();
1061 err
= init_hyp_mode();
1065 err
= __register_cpu_notifier(&hyp_init_cpu_nb
);
1067 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err
);
1071 cpu_notifier_register_done();
1075 kvm_coproc_table_init();
1078 cpu_notifier_register_done();
1082 /* NOP: Compiling as a module not supported */
1083 void kvm_arch_exit(void)
1085 kvm_perf_teardown();
1088 static int arm_init(void)
1090 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1094 module_init(arm_init
);