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 *garbage
)
95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
97 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
100 void kvm_arch_hardware_disable(void *garbage
)
104 int kvm_arch_hardware_setup(void)
109 void kvm_arch_hardware_unsetup(void)
113 void kvm_arch_check_processor_compat(void *rtn
)
118 void kvm_arch_sync_events(struct kvm
*kvm
)
123 * kvm_arch_init_vm - initializes a VM data structure
124 * @kvm: pointer to the KVM struct
126 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
133 ret
= kvm_alloc_stage2_pgd(kvm
);
137 ret
= create_hyp_mappings(kvm
, kvm
+ 1);
139 goto out_free_stage2_pgd
;
143 /* Mark the initial VMID generation invalid */
144 kvm
->arch
.vmid_gen
= 0;
148 kvm_free_stage2_pgd(kvm
);
153 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
155 return VM_FAULT_SIGBUS
;
160 * kvm_arch_destroy_vm - destroy the VM data structure
161 * @kvm: pointer to the KVM struct
163 void kvm_arch_destroy_vm(struct kvm
*kvm
)
167 kvm_free_stage2_pgd(kvm
);
169 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
171 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
172 kvm
->vcpus
[i
] = NULL
;
177 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
181 case KVM_CAP_IRQCHIP
:
184 case KVM_CAP_DEVICE_CTRL
:
185 case KVM_CAP_USER_MEMORY
:
186 case KVM_CAP_SYNC_MMU
:
187 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
188 case KVM_CAP_ONE_REG
:
189 case KVM_CAP_ARM_PSCI
:
190 case KVM_CAP_ARM_PSCI_0_2
:
191 case KVM_CAP_READONLY_MEM
:
194 case KVM_CAP_COALESCED_MMIO
:
195 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
197 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
200 case KVM_CAP_NR_VCPUS
:
201 r
= num_online_cpus();
203 case KVM_CAP_MAX_VCPUS
:
207 r
= kvm_arch_dev_ioctl_check_extension(ext
);
213 long kvm_arch_dev_ioctl(struct file
*filp
,
214 unsigned int ioctl
, unsigned long arg
)
220 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
223 struct kvm_vcpu
*vcpu
;
225 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
231 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
235 err
= create_hyp_mappings(vcpu
, vcpu
+ 1);
241 kvm_vcpu_uninit(vcpu
);
243 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
248 int kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
253 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
255 kvm_mmu_free_memory_caches(vcpu
);
256 kvm_timer_vcpu_terminate(vcpu
);
257 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
260 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
262 kvm_arch_vcpu_free(vcpu
);
265 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
270 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
274 /* Force users to call KVM_ARM_VCPU_INIT */
275 vcpu
->arch
.target
= -1;
278 ret
= kvm_vgic_vcpu_init(vcpu
);
282 /* Set up the timer */
283 kvm_timer_vcpu_init(vcpu
);
288 void kvm_arch_vcpu_uninit(struct kvm_vcpu
*vcpu
)
292 void kvm_arch_sched_in(struct kvm_vcpu
*vcpu
, int cpu
)
296 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
299 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(kvm_host_cpu_state
);
302 * Check whether this vcpu requires the cache to be flushed on
303 * this physical CPU. This is a consequence of doing dcache
304 * operations by set/way on this vcpu. We do it here to be in
305 * a non-preemptible section.
307 if (cpumask_test_and_clear_cpu(cpu
, &vcpu
->arch
.require_dcache_flush
))
308 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
310 kvm_arm_set_running_vcpu(vcpu
);
313 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
316 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
317 * if the vcpu is no longer assigned to a cpu. This is used for the
318 * optimized make_all_cpus_request path.
322 kvm_arm_set_running_vcpu(NULL
);
325 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
*vcpu
,
326 struct kvm_guest_debug
*dbg
)
332 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
333 struct kvm_mp_state
*mp_state
)
338 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
339 struct kvm_mp_state
*mp_state
)
345 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
346 * @v: The VCPU pointer
348 * If the guest CPU is not waiting for interrupts or an interrupt line is
349 * asserted, the CPU is by definition runnable.
351 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
353 return !!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
);
356 /* Just ensure a guest exit from a particular CPU */
357 static void exit_vm_noop(void *info
)
361 void force_vm_exit(const cpumask_t
*mask
)
363 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
367 * need_new_vmid_gen - check that the VMID is still valid
368 * @kvm: The VM's VMID to checkt
370 * return true if there is a new generation of VMIDs being used
372 * The hardware supports only 256 values with the value zero reserved for the
373 * host, so we check if an assigned value belongs to a previous generation,
374 * which which requires us to assign a new value. If we're the first to use a
375 * VMID for the new generation, we must flush necessary caches and TLBs on all
378 static bool need_new_vmid_gen(struct kvm
*kvm
)
380 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
384 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
385 * @kvm The guest that we are about to run
387 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
388 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
391 static void update_vttbr(struct kvm
*kvm
)
393 phys_addr_t pgd_phys
;
396 if (!need_new_vmid_gen(kvm
))
399 spin_lock(&kvm_vmid_lock
);
402 * We need to re-check the vmid_gen here to ensure that if another vcpu
403 * already allocated a valid vmid for this vm, then this vcpu should
406 if (!need_new_vmid_gen(kvm
)) {
407 spin_unlock(&kvm_vmid_lock
);
411 /* First user of a new VMID generation? */
412 if (unlikely(kvm_next_vmid
== 0)) {
413 atomic64_inc(&kvm_vmid_gen
);
417 * On SMP we know no other CPUs can use this CPU's or each
418 * other's VMID after force_vm_exit returns since the
419 * kvm_vmid_lock blocks them from reentry to the guest.
421 force_vm_exit(cpu_all_mask
);
423 * Now broadcast TLB + ICACHE invalidation over the inner
424 * shareable domain to make sure all data structures are
427 kvm_call_hyp(__kvm_flush_vm_context
);
430 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
431 kvm
->arch
.vmid
= kvm_next_vmid
;
434 /* update vttbr to be used with the new vmid */
435 pgd_phys
= virt_to_phys(kvm
->arch
.pgd
);
436 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK
;
437 kvm
->arch
.vttbr
= pgd_phys
& VTTBR_BADDR_MASK
;
438 kvm
->arch
.vttbr
|= vmid
;
440 spin_unlock(&kvm_vmid_lock
);
443 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
447 if (likely(vcpu
->arch
.has_run_once
))
450 vcpu
->arch
.has_run_once
= true;
453 * Initialize the VGIC before running a vcpu the first time on
456 if (unlikely(!vgic_initialized(vcpu
->kvm
))) {
457 ret
= kvm_vgic_init(vcpu
->kvm
);
465 static void vcpu_pause(struct kvm_vcpu
*vcpu
)
467 wait_queue_head_t
*wq
= kvm_arch_vcpu_wq(vcpu
);
469 wait_event_interruptible(*wq
, !vcpu
->arch
.pause
);
472 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
474 return vcpu
->arch
.target
>= 0;
478 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
479 * @vcpu: The VCPU pointer
480 * @run: The kvm_run structure pointer used for userspace state exchange
482 * This function is called through the VCPU_RUN ioctl called from user space. It
483 * will execute VM code in a loop until the time slice for the process is used
484 * or some emulation is needed from user space in which case the function will
485 * return with return value 0 and with the kvm_run structure filled in with the
486 * required data for the requested emulation.
488 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
493 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
496 ret
= kvm_vcpu_first_run_init(vcpu
);
500 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
501 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
506 if (vcpu
->sigset_active
)
507 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
510 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
513 * Check conditions before entering the guest
517 update_vttbr(vcpu
->kvm
);
519 if (vcpu
->arch
.pause
)
522 kvm_vgic_flush_hwstate(vcpu
);
523 kvm_timer_flush_hwstate(vcpu
);
528 * Re-check atomic conditions
530 if (signal_pending(current
)) {
532 run
->exit_reason
= KVM_EXIT_INTR
;
535 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
)) {
537 kvm_timer_sync_hwstate(vcpu
);
538 kvm_vgic_sync_hwstate(vcpu
);
542 /**************************************************************
545 trace_kvm_entry(*vcpu_pc(vcpu
));
547 vcpu
->mode
= IN_GUEST_MODE
;
549 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
551 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
552 vcpu
->arch
.last_pcpu
= smp_processor_id();
554 trace_kvm_exit(*vcpu_pc(vcpu
));
556 * We may have taken a host interrupt in HYP mode (ie
557 * while executing the guest). This interrupt is still
558 * pending, as we haven't serviced it yet!
560 * We're now back in SVC mode, with interrupts
561 * disabled. Enabling the interrupts now will have
562 * the effect of taking the interrupt again, in SVC
569 *************************************************************/
571 kvm_timer_sync_hwstate(vcpu
);
572 kvm_vgic_sync_hwstate(vcpu
);
574 ret
= handle_exit(vcpu
, run
, ret
);
577 if (vcpu
->sigset_active
)
578 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
582 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
588 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
589 bit_index
= __ffs(HCR_VI
);
590 else /* KVM_ARM_IRQ_CPU_FIQ */
591 bit_index
= __ffs(HCR_VF
);
593 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
595 set
= test_and_set_bit(bit_index
, ptr
);
597 set
= test_and_clear_bit(bit_index
, ptr
);
600 * If we didn't change anything, no need to wake up or kick other CPUs
606 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
607 * trigger a world-switch round on the running physical CPU to set the
608 * virtual IRQ/FIQ fields in the HCR appropriately.
615 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
618 u32 irq
= irq_level
->irq
;
619 unsigned int irq_type
, vcpu_idx
, irq_num
;
620 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
621 struct kvm_vcpu
*vcpu
= NULL
;
622 bool level
= irq_level
->level
;
624 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
625 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
626 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
628 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
631 case KVM_ARM_IRQ_TYPE_CPU
:
632 if (irqchip_in_kernel(kvm
))
635 if (vcpu_idx
>= nrcpus
)
638 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
642 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
645 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
646 case KVM_ARM_IRQ_TYPE_PPI
:
647 if (!irqchip_in_kernel(kvm
))
650 if (vcpu_idx
>= nrcpus
)
653 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
657 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
660 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
661 case KVM_ARM_IRQ_TYPE_SPI
:
662 if (!irqchip_in_kernel(kvm
))
665 if (irq_num
< VGIC_NR_PRIVATE_IRQS
||
666 irq_num
> KVM_ARM_IRQ_GIC_MAX
)
669 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
675 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
676 struct kvm_vcpu_init
*init
)
680 ret
= kvm_vcpu_set_target(vcpu
, init
);
685 * Handle the "start in power-off" case by marking the VCPU as paused.
687 if (__test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
688 vcpu
->arch
.pause
= true;
693 long kvm_arch_vcpu_ioctl(struct file
*filp
,
694 unsigned int ioctl
, unsigned long arg
)
696 struct kvm_vcpu
*vcpu
= filp
->private_data
;
697 void __user
*argp
= (void __user
*)arg
;
700 case KVM_ARM_VCPU_INIT
: {
701 struct kvm_vcpu_init init
;
703 if (copy_from_user(&init
, argp
, sizeof(init
)))
706 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
708 case KVM_SET_ONE_REG
:
709 case KVM_GET_ONE_REG
: {
710 struct kvm_one_reg reg
;
712 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
715 if (copy_from_user(®
, argp
, sizeof(reg
)))
717 if (ioctl
== KVM_SET_ONE_REG
)
718 return kvm_arm_set_reg(vcpu
, ®
);
720 return kvm_arm_get_reg(vcpu
, ®
);
722 case KVM_GET_REG_LIST
: {
723 struct kvm_reg_list __user
*user_list
= argp
;
724 struct kvm_reg_list reg_list
;
727 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
730 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
733 reg_list
.n
= kvm_arm_num_regs(vcpu
);
734 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
738 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
745 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
750 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
751 struct kvm_arm_device_addr
*dev_addr
)
753 unsigned long dev_id
, type
;
755 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
756 KVM_ARM_DEVICE_ID_SHIFT
;
757 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
758 KVM_ARM_DEVICE_TYPE_SHIFT
;
761 case KVM_ARM_DEVICE_VGIC_V2
:
764 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
770 long kvm_arch_vm_ioctl(struct file
*filp
,
771 unsigned int ioctl
, unsigned long arg
)
773 struct kvm
*kvm
= filp
->private_data
;
774 void __user
*argp
= (void __user
*)arg
;
777 case KVM_CREATE_IRQCHIP
: {
779 return kvm_vgic_create(kvm
);
783 case KVM_ARM_SET_DEVICE_ADDR
: {
784 struct kvm_arm_device_addr dev_addr
;
786 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
788 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
790 case KVM_ARM_PREFERRED_TARGET
: {
792 struct kvm_vcpu_init init
;
794 err
= kvm_vcpu_preferred_target(&init
);
798 if (copy_to_user(argp
, &init
, sizeof(init
)))
808 static void cpu_init_hyp_mode(void *dummy
)
810 phys_addr_t boot_pgd_ptr
;
812 unsigned long hyp_stack_ptr
;
813 unsigned long stack_page
;
814 unsigned long vector_ptr
;
816 /* Switch from the HYP stub to our own HYP init vector */
817 __hyp_set_vectors(kvm_get_idmap_vector());
819 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
820 pgd_ptr
= kvm_mmu_get_httbr();
821 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
822 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
823 vector_ptr
= (unsigned long)__kvm_hyp_vector
;
825 __cpu_init_hyp_mode(boot_pgd_ptr
, pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
828 static int hyp_init_cpu_notify(struct notifier_block
*self
,
829 unsigned long action
, void *cpu
)
833 case CPU_STARTING_FROZEN
:
834 cpu_init_hyp_mode(NULL
);
841 static struct notifier_block hyp_init_cpu_nb
= {
842 .notifier_call
= hyp_init_cpu_notify
,
846 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
850 if (cmd
== CPU_PM_EXIT
&&
851 __hyp_get_vectors() == hyp_default_vectors
) {
852 cpu_init_hyp_mode(NULL
);
859 static struct notifier_block hyp_init_cpu_pm_nb
= {
860 .notifier_call
= hyp_init_cpu_pm_notifier
,
863 static void __init
hyp_cpu_pm_init(void)
865 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
868 static inline void hyp_cpu_pm_init(void)
874 * Inits Hyp-mode on all online CPUs
876 static int init_hyp_mode(void)
882 * Allocate Hyp PGD and setup Hyp identity mapping
884 err
= kvm_mmu_init();
889 * It is probably enough to obtain the default on one
890 * CPU. It's unlikely to be different on the others.
892 hyp_default_vectors
= __hyp_get_vectors();
895 * Allocate stack pages for Hypervisor-mode
897 for_each_possible_cpu(cpu
) {
898 unsigned long stack_page
;
900 stack_page
= __get_free_page(GFP_KERNEL
);
903 goto out_free_stack_pages
;
906 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
910 * Map the Hyp-code called directly from the host
912 err
= create_hyp_mappings(__kvm_hyp_code_start
, __kvm_hyp_code_end
);
914 kvm_err("Cannot map world-switch code\n");
915 goto out_free_mappings
;
919 * Map the Hyp stack pages
921 for_each_possible_cpu(cpu
) {
922 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
923 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
);
926 kvm_err("Cannot map hyp stack\n");
927 goto out_free_mappings
;
932 * Map the host CPU structures
934 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
935 if (!kvm_host_cpu_state
) {
937 kvm_err("Cannot allocate host CPU state\n");
938 goto out_free_mappings
;
941 for_each_possible_cpu(cpu
) {
942 kvm_cpu_context_t
*cpu_ctxt
;
944 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
945 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1);
948 kvm_err("Cannot map host CPU state: %d\n", err
);
949 goto out_free_context
;
954 * Execute the init code on each CPU.
956 on_each_cpu(cpu_init_hyp_mode
, NULL
, 1);
959 * Init HYP view of VGIC
961 err
= kvm_vgic_hyp_init();
963 goto out_free_context
;
965 #ifdef CONFIG_KVM_ARM_VGIC
970 * Init HYP architected timer support
972 err
= kvm_timer_hyp_init();
974 goto out_free_mappings
;
976 #ifndef CONFIG_HOTPLUG_CPU
982 kvm_info("Hyp mode initialized successfully\n");
986 free_percpu(kvm_host_cpu_state
);
989 out_free_stack_pages
:
990 for_each_possible_cpu(cpu
)
991 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
993 kvm_err("error initializing Hyp mode: %d\n", err
);
997 static void check_kvm_target_cpu(void *ret
)
999 *(int *)ret
= kvm_target_cpu();
1003 * Initialize Hyp-mode and memory mappings on all CPUs.
1005 int kvm_arch_init(void *opaque
)
1010 if (!is_hyp_mode_available()) {
1011 kvm_err("HYP mode not available\n");
1015 for_each_online_cpu(cpu
) {
1016 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1018 kvm_err("Error, CPU %d not supported!\n", cpu
);
1023 cpu_notifier_register_begin();
1025 err
= init_hyp_mode();
1029 err
= __register_cpu_notifier(&hyp_init_cpu_nb
);
1031 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err
);
1035 cpu_notifier_register_done();
1039 kvm_coproc_table_init();
1042 cpu_notifier_register_done();
1046 /* NOP: Compiling as a module not supported */
1047 void kvm_arch_exit(void)
1049 kvm_perf_teardown();
1052 static int arm_init(void)
1054 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1058 module_init(arm_init
);