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/errno.h>
21 #include <linux/err.h>
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
26 #include <linux/mman.h>
27 #include <linux/sched.h>
28 #include <linux/kvm.h>
29 #include <trace/events/kvm.h>
31 #define CREATE_TRACE_POINTS
34 #include <asm/uaccess.h>
35 #include <asm/ptrace.h>
37 #include <asm/tlbflush.h>
38 #include <asm/cacheflush.h>
40 #include <asm/kvm_arm.h>
41 #include <asm/kvm_asm.h>
42 #include <asm/kvm_mmu.h>
43 #include <asm/kvm_emulate.h>
44 #include <asm/kvm_coproc.h>
45 #include <asm/kvm_psci.h>
48 __asm__(".arch_extension virt");
51 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page
);
52 static kvm_cpu_context_t __percpu
*kvm_host_cpu_state
;
53 static unsigned long hyp_default_vectors
;
55 /* Per-CPU variable containing the currently running vcpu. */
56 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_arm_running_vcpu
);
58 /* The VMID used in the VTTBR */
59 static atomic64_t kvm_vmid_gen
= ATOMIC64_INIT(1);
60 static u8 kvm_next_vmid
;
61 static DEFINE_SPINLOCK(kvm_vmid_lock
);
63 static bool vgic_present
;
65 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
67 BUG_ON(preemptible());
68 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
72 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
73 * Must be called from non-preemptible context
75 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
77 BUG_ON(preemptible());
78 return __this_cpu_read(kvm_arm_running_vcpu
);
82 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
84 struct kvm_vcpu __percpu
**kvm_get_running_vcpus(void)
86 return &kvm_arm_running_vcpu
;
89 int kvm_arch_hardware_enable(void *garbage
)
94 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
96 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
99 void kvm_arch_hardware_disable(void *garbage
)
103 int kvm_arch_hardware_setup(void)
108 void kvm_arch_hardware_unsetup(void)
112 void kvm_arch_check_processor_compat(void *rtn
)
117 void kvm_arch_sync_events(struct kvm
*kvm
)
122 * kvm_arch_init_vm - initializes a VM data structure
123 * @kvm: pointer to the KVM struct
125 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
132 ret
= kvm_alloc_stage2_pgd(kvm
);
136 ret
= create_hyp_mappings(kvm
, kvm
+ 1);
138 goto out_free_stage2_pgd
;
142 /* Mark the initial VMID generation invalid */
143 kvm
->arch
.vmid_gen
= 0;
147 kvm_free_stage2_pgd(kvm
);
152 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
154 return VM_FAULT_SIGBUS
;
157 void kvm_arch_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
158 struct kvm_memory_slot
*dont
)
162 int kvm_arch_create_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*slot
,
163 unsigned long npages
)
169 * kvm_arch_destroy_vm - destroy the VM data structure
170 * @kvm: pointer to the KVM struct
172 void kvm_arch_destroy_vm(struct kvm
*kvm
)
176 kvm_free_stage2_pgd(kvm
);
178 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
180 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
181 kvm
->vcpus
[i
] = NULL
;
186 int kvm_dev_ioctl_check_extension(long ext
)
190 case KVM_CAP_IRQCHIP
:
193 case KVM_CAP_DEVICE_CTRL
:
194 case KVM_CAP_USER_MEMORY
:
195 case KVM_CAP_SYNC_MMU
:
196 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
197 case KVM_CAP_ONE_REG
:
198 case KVM_CAP_ARM_PSCI
:
201 case KVM_CAP_COALESCED_MMIO
:
202 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
204 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
207 case KVM_CAP_NR_VCPUS
:
208 r
= num_online_cpus();
210 case KVM_CAP_MAX_VCPUS
:
214 r
= kvm_arch_dev_ioctl_check_extension(ext
);
220 long kvm_arch_dev_ioctl(struct file
*filp
,
221 unsigned int ioctl
, unsigned long arg
)
226 void kvm_arch_memslots_updated(struct kvm
*kvm
)
230 int kvm_arch_prepare_memory_region(struct kvm
*kvm
,
231 struct kvm_memory_slot
*memslot
,
232 struct kvm_userspace_memory_region
*mem
,
233 enum kvm_mr_change change
)
238 void kvm_arch_commit_memory_region(struct kvm
*kvm
,
239 struct kvm_userspace_memory_region
*mem
,
240 const struct kvm_memory_slot
*old
,
241 enum kvm_mr_change change
)
245 void kvm_arch_flush_shadow_all(struct kvm
*kvm
)
249 void kvm_arch_flush_shadow_memslot(struct kvm
*kvm
,
250 struct kvm_memory_slot
*slot
)
254 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
257 struct kvm_vcpu
*vcpu
;
259 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
265 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
269 err
= create_hyp_mappings(vcpu
, vcpu
+ 1);
275 kvm_vcpu_uninit(vcpu
);
277 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
282 int kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
287 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
289 kvm_mmu_free_memory_caches(vcpu
);
290 kvm_timer_vcpu_terminate(vcpu
);
291 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
294 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
296 kvm_arch_vcpu_free(vcpu
);
299 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
304 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
308 /* Force users to call KVM_ARM_VCPU_INIT */
309 vcpu
->arch
.target
= -1;
312 ret
= kvm_vgic_vcpu_init(vcpu
);
316 /* Set up the timer */
317 kvm_timer_vcpu_init(vcpu
);
322 void kvm_arch_vcpu_uninit(struct kvm_vcpu
*vcpu
)
326 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
329 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(kvm_host_cpu_state
);
332 * Check whether this vcpu requires the cache to be flushed on
333 * this physical CPU. This is a consequence of doing dcache
334 * operations by set/way on this vcpu. We do it here to be in
335 * a non-preemptible section.
337 if (cpumask_test_and_clear_cpu(cpu
, &vcpu
->arch
.require_dcache_flush
))
338 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
340 kvm_arm_set_running_vcpu(vcpu
);
343 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
345 kvm_arm_set_running_vcpu(NULL
);
348 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
*vcpu
,
349 struct kvm_guest_debug
*dbg
)
355 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
356 struct kvm_mp_state
*mp_state
)
361 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
362 struct kvm_mp_state
*mp_state
)
368 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
369 * @v: The VCPU pointer
371 * If the guest CPU is not waiting for interrupts or an interrupt line is
372 * asserted, the CPU is by definition runnable.
374 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
376 return !!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
);
379 /* Just ensure a guest exit from a particular CPU */
380 static void exit_vm_noop(void *info
)
384 void force_vm_exit(const cpumask_t
*mask
)
386 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
390 * need_new_vmid_gen - check that the VMID is still valid
391 * @kvm: The VM's VMID to checkt
393 * return true if there is a new generation of VMIDs being used
395 * The hardware supports only 256 values with the value zero reserved for the
396 * host, so we check if an assigned value belongs to a previous generation,
397 * which which requires us to assign a new value. If we're the first to use a
398 * VMID for the new generation, we must flush necessary caches and TLBs on all
401 static bool need_new_vmid_gen(struct kvm
*kvm
)
403 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
407 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
408 * @kvm The guest that we are about to run
410 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
411 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
414 static void update_vttbr(struct kvm
*kvm
)
416 phys_addr_t pgd_phys
;
419 if (!need_new_vmid_gen(kvm
))
422 spin_lock(&kvm_vmid_lock
);
425 * We need to re-check the vmid_gen here to ensure that if another vcpu
426 * already allocated a valid vmid for this vm, then this vcpu should
429 if (!need_new_vmid_gen(kvm
)) {
430 spin_unlock(&kvm_vmid_lock
);
434 /* First user of a new VMID generation? */
435 if (unlikely(kvm_next_vmid
== 0)) {
436 atomic64_inc(&kvm_vmid_gen
);
440 * On SMP we know no other CPUs can use this CPU's or each
441 * other's VMID after force_vm_exit returns since the
442 * kvm_vmid_lock blocks them from reentry to the guest.
444 force_vm_exit(cpu_all_mask
);
446 * Now broadcast TLB + ICACHE invalidation over the inner
447 * shareable domain to make sure all data structures are
450 kvm_call_hyp(__kvm_flush_vm_context
);
453 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
454 kvm
->arch
.vmid
= kvm_next_vmid
;
457 /* update vttbr to be used with the new vmid */
458 pgd_phys
= virt_to_phys(kvm
->arch
.pgd
);
459 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK
;
460 kvm
->arch
.vttbr
= pgd_phys
& VTTBR_BADDR_MASK
;
461 kvm
->arch
.vttbr
|= vmid
;
463 spin_unlock(&kvm_vmid_lock
);
466 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
470 if (likely(vcpu
->arch
.has_run_once
))
473 vcpu
->arch
.has_run_once
= true;
476 * Initialize the VGIC before running a vcpu the first time on
479 if (unlikely(!vgic_initialized(vcpu
->kvm
))) {
480 ret
= kvm_vgic_init(vcpu
->kvm
);
486 * Handle the "start in power-off" case by calling into the
489 if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
)) {
490 *vcpu_reg(vcpu
, 0) = KVM_PSCI_FN_CPU_OFF
;
497 static void vcpu_pause(struct kvm_vcpu
*vcpu
)
499 wait_queue_head_t
*wq
= kvm_arch_vcpu_wq(vcpu
);
501 wait_event_interruptible(*wq
, !vcpu
->arch
.pause
);
504 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
506 return vcpu
->arch
.target
>= 0;
510 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
511 * @vcpu: The VCPU pointer
512 * @run: The kvm_run structure pointer used for userspace state exchange
514 * This function is called through the VCPU_RUN ioctl called from user space. It
515 * will execute VM code in a loop until the time slice for the process is used
516 * or some emulation is needed from user space in which case the function will
517 * return with return value 0 and with the kvm_run structure filled in with the
518 * required data for the requested emulation.
520 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
525 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
528 ret
= kvm_vcpu_first_run_init(vcpu
);
532 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
533 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
538 if (vcpu
->sigset_active
)
539 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
542 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
545 * Check conditions before entering the guest
549 update_vttbr(vcpu
->kvm
);
551 if (vcpu
->arch
.pause
)
554 kvm_vgic_flush_hwstate(vcpu
);
555 kvm_timer_flush_hwstate(vcpu
);
560 * Re-check atomic conditions
562 if (signal_pending(current
)) {
564 run
->exit_reason
= KVM_EXIT_INTR
;
567 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
)) {
569 kvm_timer_sync_hwstate(vcpu
);
570 kvm_vgic_sync_hwstate(vcpu
);
574 /**************************************************************
577 trace_kvm_entry(*vcpu_pc(vcpu
));
579 vcpu
->mode
= IN_GUEST_MODE
;
581 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
583 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
584 vcpu
->arch
.last_pcpu
= smp_processor_id();
586 trace_kvm_exit(*vcpu_pc(vcpu
));
588 * We may have taken a host interrupt in HYP mode (ie
589 * while executing the guest). This interrupt is still
590 * pending, as we haven't serviced it yet!
592 * We're now back in SVC mode, with interrupts
593 * disabled. Enabling the interrupts now will have
594 * the effect of taking the interrupt again, in SVC
601 *************************************************************/
603 kvm_timer_sync_hwstate(vcpu
);
604 kvm_vgic_sync_hwstate(vcpu
);
606 ret
= handle_exit(vcpu
, run
, ret
);
609 if (vcpu
->sigset_active
)
610 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
614 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
620 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
621 bit_index
= __ffs(HCR_VI
);
622 else /* KVM_ARM_IRQ_CPU_FIQ */
623 bit_index
= __ffs(HCR_VF
);
625 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
627 set
= test_and_set_bit(bit_index
, ptr
);
629 set
= test_and_clear_bit(bit_index
, ptr
);
632 * If we didn't change anything, no need to wake up or kick other CPUs
638 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
639 * trigger a world-switch round on the running physical CPU to set the
640 * virtual IRQ/FIQ fields in the HCR appropriately.
647 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
650 u32 irq
= irq_level
->irq
;
651 unsigned int irq_type
, vcpu_idx
, irq_num
;
652 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
653 struct kvm_vcpu
*vcpu
= NULL
;
654 bool level
= irq_level
->level
;
656 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
657 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
658 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
660 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
663 case KVM_ARM_IRQ_TYPE_CPU
:
664 if (irqchip_in_kernel(kvm
))
667 if (vcpu_idx
>= nrcpus
)
670 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
674 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
677 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
678 case KVM_ARM_IRQ_TYPE_PPI
:
679 if (!irqchip_in_kernel(kvm
))
682 if (vcpu_idx
>= nrcpus
)
685 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
689 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
692 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
693 case KVM_ARM_IRQ_TYPE_SPI
:
694 if (!irqchip_in_kernel(kvm
))
697 if (irq_num
< VGIC_NR_PRIVATE_IRQS
||
698 irq_num
> KVM_ARM_IRQ_GIC_MAX
)
701 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
707 long kvm_arch_vcpu_ioctl(struct file
*filp
,
708 unsigned int ioctl
, unsigned long arg
)
710 struct kvm_vcpu
*vcpu
= filp
->private_data
;
711 void __user
*argp
= (void __user
*)arg
;
714 case KVM_ARM_VCPU_INIT
: {
715 struct kvm_vcpu_init init
;
717 if (copy_from_user(&init
, argp
, sizeof(init
)))
720 return kvm_vcpu_set_target(vcpu
, &init
);
723 case KVM_SET_ONE_REG
:
724 case KVM_GET_ONE_REG
: {
725 struct kvm_one_reg reg
;
727 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
730 if (copy_from_user(®
, argp
, sizeof(reg
)))
732 if (ioctl
== KVM_SET_ONE_REG
)
733 return kvm_arm_set_reg(vcpu
, ®
);
735 return kvm_arm_get_reg(vcpu
, ®
);
737 case KVM_GET_REG_LIST
: {
738 struct kvm_reg_list __user
*user_list
= argp
;
739 struct kvm_reg_list reg_list
;
742 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
745 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
748 reg_list
.n
= kvm_arm_num_regs(vcpu
);
749 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
753 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
760 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
765 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
766 struct kvm_arm_device_addr
*dev_addr
)
768 unsigned long dev_id
, type
;
770 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
771 KVM_ARM_DEVICE_ID_SHIFT
;
772 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
773 KVM_ARM_DEVICE_TYPE_SHIFT
;
776 case KVM_ARM_DEVICE_VGIC_V2
:
779 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
785 long kvm_arch_vm_ioctl(struct file
*filp
,
786 unsigned int ioctl
, unsigned long arg
)
788 struct kvm
*kvm
= filp
->private_data
;
789 void __user
*argp
= (void __user
*)arg
;
792 case KVM_CREATE_IRQCHIP
: {
794 return kvm_vgic_create(kvm
);
798 case KVM_ARM_SET_DEVICE_ADDR
: {
799 struct kvm_arm_device_addr dev_addr
;
801 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
803 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
805 case KVM_ARM_PREFERRED_TARGET
: {
807 struct kvm_vcpu_init init
;
809 err
= kvm_vcpu_preferred_target(&init
);
813 if (copy_to_user(argp
, &init
, sizeof(init
)))
823 static void cpu_init_hyp_mode(void *dummy
)
825 phys_addr_t boot_pgd_ptr
;
827 unsigned long hyp_stack_ptr
;
828 unsigned long stack_page
;
829 unsigned long vector_ptr
;
831 /* Switch from the HYP stub to our own HYP init vector */
832 __hyp_set_vectors(kvm_get_idmap_vector());
834 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
835 pgd_ptr
= kvm_mmu_get_httbr();
836 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
837 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
838 vector_ptr
= (unsigned long)__kvm_hyp_vector
;
840 __cpu_init_hyp_mode(boot_pgd_ptr
, pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
843 static int hyp_init_cpu_notify(struct notifier_block
*self
,
844 unsigned long action
, void *cpu
)
848 case CPU_STARTING_FROZEN
:
849 cpu_init_hyp_mode(NULL
);
856 static struct notifier_block hyp_init_cpu_nb
= {
857 .notifier_call
= hyp_init_cpu_notify
,
861 * Inits Hyp-mode on all online CPUs
863 static int init_hyp_mode(void)
869 * Allocate Hyp PGD and setup Hyp identity mapping
871 err
= kvm_mmu_init();
876 * It is probably enough to obtain the default on one
877 * CPU. It's unlikely to be different on the others.
879 hyp_default_vectors
= __hyp_get_vectors();
882 * Allocate stack pages for Hypervisor-mode
884 for_each_possible_cpu(cpu
) {
885 unsigned long stack_page
;
887 stack_page
= __get_free_page(GFP_KERNEL
);
890 goto out_free_stack_pages
;
893 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
897 * Map the Hyp-code called directly from the host
899 err
= create_hyp_mappings(__kvm_hyp_code_start
, __kvm_hyp_code_end
);
901 kvm_err("Cannot map world-switch code\n");
902 goto out_free_mappings
;
906 * Map the Hyp stack pages
908 for_each_possible_cpu(cpu
) {
909 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
910 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
);
913 kvm_err("Cannot map hyp stack\n");
914 goto out_free_mappings
;
919 * Map the host CPU structures
921 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
922 if (!kvm_host_cpu_state
) {
924 kvm_err("Cannot allocate host CPU state\n");
925 goto out_free_mappings
;
928 for_each_possible_cpu(cpu
) {
929 kvm_cpu_context_t
*cpu_ctxt
;
931 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
932 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1);
935 kvm_err("Cannot map host CPU state: %d\n", err
);
936 goto out_free_context
;
941 * Execute the init code on each CPU.
943 on_each_cpu(cpu_init_hyp_mode
, NULL
, 1);
946 * Init HYP view of VGIC
948 err
= kvm_vgic_hyp_init();
950 goto out_free_context
;
952 #ifdef CONFIG_KVM_ARM_VGIC
957 * Init HYP architected timer support
959 err
= kvm_timer_hyp_init();
961 goto out_free_mappings
;
963 #ifndef CONFIG_HOTPLUG_CPU
969 kvm_info("Hyp mode initialized successfully\n");
973 free_percpu(kvm_host_cpu_state
);
976 out_free_stack_pages
:
977 for_each_possible_cpu(cpu
)
978 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
980 kvm_err("error initializing Hyp mode: %d\n", err
);
984 static void check_kvm_target_cpu(void *ret
)
986 *(int *)ret
= kvm_target_cpu();
990 * Initialize Hyp-mode and memory mappings on all CPUs.
992 int kvm_arch_init(void *opaque
)
997 if (!is_hyp_mode_available()) {
998 kvm_err("HYP mode not available\n");
1002 for_each_online_cpu(cpu
) {
1003 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1005 kvm_err("Error, CPU %d not supported!\n", cpu
);
1010 err
= init_hyp_mode();
1014 err
= register_cpu_notifier(&hyp_init_cpu_nb
);
1016 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err
);
1020 kvm_coproc_table_init();
1026 /* NOP: Compiling as a module not supported */
1027 void kvm_arch_exit(void)
1029 kvm_perf_teardown();
1032 static int arm_init(void)
1034 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1038 module_init(arm_init
);