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_pm.h>
20 #include <linux/errno.h>
21 #include <linux/err.h>
22 #include <linux/kvm_host.h>
23 #include <linux/list.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 <linux/kvm_irqfd.h>
31 #include <linux/irqbypass.h>
32 #include <trace/events/kvm.h>
33 #include <kvm/arm_pmu.h>
34 #include <kvm/arm_psci.h>
36 #define CREATE_TRACE_POINTS
39 #include <linux/uaccess.h>
40 #include <asm/ptrace.h>
42 #include <asm/tlbflush.h>
43 #include <asm/cacheflush.h>
45 #include <asm/kvm_arm.h>
46 #include <asm/kvm_asm.h>
47 #include <asm/kvm_mmu.h>
48 #include <asm/kvm_emulate.h>
49 #include <asm/kvm_coproc.h>
50 #include <asm/sections.h>
53 __asm__(".arch_extension virt");
56 DEFINE_PER_CPU(kvm_cpu_context_t
, kvm_host_cpu_state
);
57 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page
);
59 /* Per-CPU variable containing the currently running vcpu. */
60 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_arm_running_vcpu
);
62 /* The VMID used in the VTTBR */
63 static atomic64_t kvm_vmid_gen
= ATOMIC64_INIT(1);
64 static u32 kvm_next_vmid
;
65 static unsigned int kvm_vmid_bits __read_mostly
;
66 static DEFINE_SPINLOCK(kvm_vmid_lock
);
68 static bool vgic_present
;
70 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled
);
72 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
74 BUG_ON(preemptible());
75 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
79 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
80 * Must be called from non-preemptible context
82 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
84 BUG_ON(preemptible());
85 return __this_cpu_read(kvm_arm_running_vcpu
);
89 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
91 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
93 return &kvm_arm_running_vcpu
;
96 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
98 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
101 int kvm_arch_hardware_setup(void)
106 void kvm_arch_check_processor_compat(void *rtn
)
113 * kvm_arch_init_vm - initializes a VM data structure
114 * @kvm: pointer to the KVM struct
116 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
123 kvm
->arch
.last_vcpu_ran
= alloc_percpu(typeof(*kvm
->arch
.last_vcpu_ran
));
124 if (!kvm
->arch
.last_vcpu_ran
)
127 for_each_possible_cpu(cpu
)
128 *per_cpu_ptr(kvm
->arch
.last_vcpu_ran
, cpu
) = -1;
130 ret
= kvm_alloc_stage2_pgd(kvm
);
134 ret
= create_hyp_mappings(kvm
, kvm
+ 1, PAGE_HYP
);
136 goto out_free_stage2_pgd
;
138 kvm_vgic_early_init(kvm
);
140 /* Mark the initial VMID generation invalid */
141 kvm
->arch
.vmid_gen
= 0;
143 /* The maximum number of VCPUs is limited by the host's GIC model */
144 kvm
->arch
.max_vcpus
= vgic_present
?
145 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS
;
149 kvm_free_stage2_pgd(kvm
);
151 free_percpu(kvm
->arch
.last_vcpu_ran
);
152 kvm
->arch
.last_vcpu_ran
= NULL
;
156 bool kvm_arch_has_vcpu_debugfs(void)
161 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
166 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
168 return VM_FAULT_SIGBUS
;
173 * kvm_arch_destroy_vm - destroy the VM data structure
174 * @kvm: pointer to the KVM struct
176 void kvm_arch_destroy_vm(struct kvm
*kvm
)
180 kvm_vgic_destroy(kvm
);
182 free_percpu(kvm
->arch
.last_vcpu_ran
);
183 kvm
->arch
.last_vcpu_ran
= NULL
;
185 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
187 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
188 kvm
->vcpus
[i
] = NULL
;
191 atomic_set(&kvm
->online_vcpus
, 0);
194 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
198 case KVM_CAP_IRQCHIP
:
201 case KVM_CAP_IOEVENTFD
:
202 case KVM_CAP_DEVICE_CTRL
:
203 case KVM_CAP_USER_MEMORY
:
204 case KVM_CAP_SYNC_MMU
:
205 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
206 case KVM_CAP_ONE_REG
:
207 case KVM_CAP_ARM_PSCI
:
208 case KVM_CAP_ARM_PSCI_0_2
:
209 case KVM_CAP_READONLY_MEM
:
210 case KVM_CAP_MP_STATE
:
211 case KVM_CAP_IMMEDIATE_EXIT
:
214 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
217 case KVM_CAP_NR_VCPUS
:
218 r
= num_online_cpus();
220 case KVM_CAP_MAX_VCPUS
:
223 case KVM_CAP_MAX_VCPU_ID
:
226 case KVM_CAP_NR_MEMSLOTS
:
227 r
= KVM_USER_MEM_SLOTS
;
229 case KVM_CAP_MSI_DEVID
:
233 r
= kvm
->arch
.vgic
.msis_require_devid
;
235 case KVM_CAP_ARM_USER_IRQ
:
237 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
238 * (bump this number if adding more devices)
243 r
= kvm_arch_dev_ioctl_check_extension(kvm
, ext
);
249 long kvm_arch_dev_ioctl(struct file
*filp
,
250 unsigned int ioctl
, unsigned long arg
)
256 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
259 struct kvm_vcpu
*vcpu
;
261 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
)) {
266 if (id
>= kvm
->arch
.max_vcpus
) {
271 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
277 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
281 err
= create_hyp_mappings(vcpu
, vcpu
+ 1, PAGE_HYP
);
287 kvm_vcpu_uninit(vcpu
);
289 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
294 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
296 kvm_vgic_vcpu_early_init(vcpu
);
299 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
301 kvm_mmu_free_memory_caches(vcpu
);
302 kvm_timer_vcpu_terminate(vcpu
);
303 kvm_pmu_vcpu_destroy(vcpu
);
304 kvm_vcpu_uninit(vcpu
);
305 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
308 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
310 kvm_arch_vcpu_free(vcpu
);
313 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
315 return kvm_timer_is_pending(vcpu
);
318 void kvm_arch_vcpu_blocking(struct kvm_vcpu
*vcpu
)
320 kvm_timer_schedule(vcpu
);
322 * If we're about to block (most likely because we've just hit a
323 * WFI), we need to sync back the state of the GIC CPU interface
324 * so that we have the lastest PMR and group enables. This ensures
325 * that kvm_arch_vcpu_runnable has up-to-date data to decide
326 * whether we have pending interrupts.
329 kvm_vgic_vmcr_sync(vcpu
);
332 kvm_vgic_v4_enable_doorbell(vcpu
);
335 void kvm_arch_vcpu_unblocking(struct kvm_vcpu
*vcpu
)
337 kvm_timer_unschedule(vcpu
);
338 kvm_vgic_v4_disable_doorbell(vcpu
);
341 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
343 /* Force users to call KVM_ARM_VCPU_INIT */
344 vcpu
->arch
.target
= -1;
345 bitmap_zero(vcpu
->arch
.features
, KVM_VCPU_MAX_FEATURES
);
347 /* Set up the timer */
348 kvm_timer_vcpu_init(vcpu
);
350 kvm_arm_reset_debug_ptr(vcpu
);
352 return kvm_vgic_vcpu_init(vcpu
);
355 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
359 last_ran
= this_cpu_ptr(vcpu
->kvm
->arch
.last_vcpu_ran
);
362 * We might get preempted before the vCPU actually runs, but
363 * over-invalidation doesn't affect correctness.
365 if (*last_ran
!= vcpu
->vcpu_id
) {
366 kvm_call_hyp(__kvm_tlb_flush_local_vmid
, vcpu
);
367 *last_ran
= vcpu
->vcpu_id
;
371 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(&kvm_host_cpu_state
);
373 kvm_arm_set_running_vcpu(vcpu
);
375 kvm_timer_vcpu_load(vcpu
);
378 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
380 kvm_timer_vcpu_put(vcpu
);
385 kvm_arm_set_running_vcpu(NULL
);
388 static void vcpu_power_off(struct kvm_vcpu
*vcpu
)
390 vcpu
->arch
.power_off
= true;
391 kvm_make_request(KVM_REQ_SLEEP
, vcpu
);
395 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
396 struct kvm_mp_state
*mp_state
)
398 if (vcpu
->arch
.power_off
)
399 mp_state
->mp_state
= KVM_MP_STATE_STOPPED
;
401 mp_state
->mp_state
= KVM_MP_STATE_RUNNABLE
;
406 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
407 struct kvm_mp_state
*mp_state
)
409 switch (mp_state
->mp_state
) {
410 case KVM_MP_STATE_RUNNABLE
:
411 vcpu
->arch
.power_off
= false;
413 case KVM_MP_STATE_STOPPED
:
414 vcpu_power_off(vcpu
);
424 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
425 * @v: The VCPU pointer
427 * If the guest CPU is not waiting for interrupts or an interrupt line is
428 * asserted, the CPU is by definition runnable.
430 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
432 return ((!!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
))
433 && !v
->arch
.power_off
&& !v
->arch
.pause
);
436 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu
*vcpu
)
438 return vcpu_mode_priv(vcpu
);
441 /* Just ensure a guest exit from a particular CPU */
442 static void exit_vm_noop(void *info
)
446 void force_vm_exit(const cpumask_t
*mask
)
449 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
454 * need_new_vmid_gen - check that the VMID is still valid
455 * @kvm: The VM's VMID to check
457 * return true if there is a new generation of VMIDs being used
459 * The hardware supports only 256 values with the value zero reserved for the
460 * host, so we check if an assigned value belongs to a previous generation,
461 * which which requires us to assign a new value. If we're the first to use a
462 * VMID for the new generation, we must flush necessary caches and TLBs on all
465 static bool need_new_vmid_gen(struct kvm
*kvm
)
467 u64 current_vmid_gen
= atomic64_read(&kvm_vmid_gen
);
468 smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */
469 return unlikely(READ_ONCE(kvm
->arch
.vmid_gen
) != current_vmid_gen
);
473 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
474 * @kvm The guest that we are about to run
476 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
477 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
480 static void update_vttbr(struct kvm
*kvm
)
482 phys_addr_t pgd_phys
;
485 if (!need_new_vmid_gen(kvm
))
488 spin_lock(&kvm_vmid_lock
);
491 * We need to re-check the vmid_gen here to ensure that if another vcpu
492 * already allocated a valid vmid for this vm, then this vcpu should
495 if (!need_new_vmid_gen(kvm
)) {
496 spin_unlock(&kvm_vmid_lock
);
500 /* First user of a new VMID generation? */
501 if (unlikely(kvm_next_vmid
== 0)) {
502 atomic64_inc(&kvm_vmid_gen
);
506 * On SMP we know no other CPUs can use this CPU's or each
507 * other's VMID after force_vm_exit returns since the
508 * kvm_vmid_lock blocks them from reentry to the guest.
510 force_vm_exit(cpu_all_mask
);
512 * Now broadcast TLB + ICACHE invalidation over the inner
513 * shareable domain to make sure all data structures are
516 kvm_call_hyp(__kvm_flush_vm_context
);
519 kvm
->arch
.vmid
= kvm_next_vmid
;
521 kvm_next_vmid
&= (1 << kvm_vmid_bits
) - 1;
523 /* update vttbr to be used with the new vmid */
524 pgd_phys
= virt_to_phys(kvm
->arch
.pgd
);
525 BUG_ON(pgd_phys
& ~VTTBR_BADDR_MASK
);
526 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK(kvm_vmid_bits
);
527 kvm
->arch
.vttbr
= pgd_phys
| vmid
;
530 WRITE_ONCE(kvm
->arch
.vmid_gen
, atomic64_read(&kvm_vmid_gen
));
532 spin_unlock(&kvm_vmid_lock
);
535 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
537 struct kvm
*kvm
= vcpu
->kvm
;
540 if (likely(vcpu
->arch
.has_run_once
))
543 vcpu
->arch
.has_run_once
= true;
546 * Map the VGIC hardware resources before running a vcpu the first
549 if (unlikely(irqchip_in_kernel(kvm
) && !vgic_ready(kvm
))) {
550 ret
= kvm_vgic_map_resources(kvm
);
555 ret
= kvm_timer_enable(vcpu
);
559 ret
= kvm_arm_pmu_v3_enable(vcpu
);
564 bool kvm_arch_intc_initialized(struct kvm
*kvm
)
566 return vgic_initialized(kvm
);
569 void kvm_arm_halt_guest(struct kvm
*kvm
)
572 struct kvm_vcpu
*vcpu
;
574 kvm_for_each_vcpu(i
, vcpu
, kvm
)
575 vcpu
->arch
.pause
= true;
576 kvm_make_all_cpus_request(kvm
, KVM_REQ_SLEEP
);
579 void kvm_arm_resume_guest(struct kvm
*kvm
)
582 struct kvm_vcpu
*vcpu
;
584 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
585 vcpu
->arch
.pause
= false;
586 swake_up(kvm_arch_vcpu_wq(vcpu
));
590 static void vcpu_req_sleep(struct kvm_vcpu
*vcpu
)
592 struct swait_queue_head
*wq
= kvm_arch_vcpu_wq(vcpu
);
594 swait_event_interruptible(*wq
, ((!vcpu
->arch
.power_off
) &&
595 (!vcpu
->arch
.pause
)));
597 if (vcpu
->arch
.power_off
|| vcpu
->arch
.pause
) {
598 /* Awaken to handle a signal, request we sleep again later. */
599 kvm_make_request(KVM_REQ_SLEEP
, vcpu
);
603 * Make sure we will observe a potential reset request if we've
604 * observed a change to the power state. Pairs with the smp_wmb() in
605 * kvm_psci_vcpu_on().
610 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
612 return vcpu
->arch
.target
>= 0;
615 static void check_vcpu_requests(struct kvm_vcpu
*vcpu
)
617 if (kvm_request_pending(vcpu
)) {
618 if (kvm_check_request(KVM_REQ_SLEEP
, vcpu
))
619 vcpu_req_sleep(vcpu
);
621 if (kvm_check_request(KVM_REQ_VCPU_RESET
, vcpu
))
622 kvm_reset_vcpu(vcpu
);
625 * Clear IRQ_PENDING requests that were made to guarantee
626 * that a VCPU sees new virtual interrupts.
628 kvm_check_request(KVM_REQ_IRQ_PENDING
, vcpu
);
633 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
634 * @vcpu: The VCPU pointer
635 * @run: The kvm_run structure pointer used for userspace state exchange
637 * This function is called through the VCPU_RUN ioctl called from user space. It
638 * will execute VM code in a loop until the time slice for the process is used
639 * or some emulation is needed from user space in which case the function will
640 * return with return value 0 and with the kvm_run structure filled in with the
641 * required data for the requested emulation.
643 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
647 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
650 ret
= kvm_vcpu_first_run_init(vcpu
);
654 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
655 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
658 if (kvm_arm_handle_step_debug(vcpu
, vcpu
->run
))
663 if (run
->immediate_exit
)
666 kvm_sigset_activate(vcpu
);
669 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
672 * Check conditions before entering the guest
676 update_vttbr(vcpu
->kvm
);
678 check_vcpu_requests(vcpu
);
681 * Preparing the interrupts to be injected also
682 * involves poking the GIC, which must be done in a
683 * non-preemptible context.
687 /* Flush FP/SIMD state that can't survive guest entry/exit */
688 kvm_fpsimd_flush_cpu_state();
690 kvm_pmu_flush_hwstate(vcpu
);
694 kvm_vgic_flush_hwstate(vcpu
);
697 * If we have a singal pending, or need to notify a userspace
698 * irqchip about timer or PMU level changes, then we exit (and
699 * update the timer level state in kvm_timer_update_run
702 if (signal_pending(current
) ||
703 kvm_timer_should_notify_user(vcpu
) ||
704 kvm_pmu_should_notify_user(vcpu
)) {
706 run
->exit_reason
= KVM_EXIT_INTR
;
710 * Ensure we set mode to IN_GUEST_MODE after we disable
711 * interrupts and before the final VCPU requests check.
712 * See the comment in kvm_vcpu_exiting_guest_mode() and
713 * Documentation/virtual/kvm/vcpu-requests.rst
715 smp_store_mb(vcpu
->mode
, IN_GUEST_MODE
);
717 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
) ||
718 kvm_request_pending(vcpu
)) {
719 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
720 kvm_pmu_sync_hwstate(vcpu
);
721 kvm_timer_sync_hwstate(vcpu
);
722 kvm_vgic_sync_hwstate(vcpu
);
728 kvm_arm_setup_debug(vcpu
);
730 /**************************************************************
733 trace_kvm_entry(*vcpu_pc(vcpu
));
734 guest_enter_irqoff();
736 kvm_arm_vhe_guest_enter();
738 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
741 kvm_arm_vhe_guest_exit();
742 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
746 *************************************************************/
748 kvm_arm_clear_debug(vcpu
);
751 * We must sync the PMU state before the vgic state so
752 * that the vgic can properly sample the updated state of the
755 kvm_pmu_sync_hwstate(vcpu
);
758 * Sync the vgic state before syncing the timer state because
759 * the timer code needs to know if the virtual timer
760 * interrupts are active.
762 kvm_vgic_sync_hwstate(vcpu
);
765 * Sync the timer hardware state before enabling interrupts as
766 * we don't want vtimer interrupts to race with syncing the
767 * timer virtual interrupt state.
769 kvm_timer_sync_hwstate(vcpu
);
772 * We may have taken a host interrupt in HYP mode (ie
773 * while executing the guest). This interrupt is still
774 * pending, as we haven't serviced it yet!
776 * We're now back in SVC mode, with interrupts
777 * disabled. Enabling the interrupts now will have
778 * the effect of taking the interrupt again, in SVC
784 * We do local_irq_enable() before calling guest_exit() so
785 * that if a timer interrupt hits while running the guest we
786 * account that tick as being spent in the guest. We enable
787 * preemption after calling guest_exit() so that if we get
788 * preempted we make sure ticks after that is not counted as
792 trace_kvm_exit(ret
, kvm_vcpu_trap_get_class(vcpu
), *vcpu_pc(vcpu
));
794 /* Exit types that need handling before we can be preempted */
795 handle_exit_early(vcpu
, run
, ret
);
799 ret
= handle_exit(vcpu
, run
, ret
);
802 /* Tell userspace about in-kernel device output levels */
803 if (unlikely(!irqchip_in_kernel(vcpu
->kvm
))) {
804 kvm_timer_update_run(vcpu
);
805 kvm_pmu_update_run(vcpu
);
808 kvm_sigset_deactivate(vcpu
);
813 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
819 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
820 bit_index
= __ffs(HCR_VI
);
821 else /* KVM_ARM_IRQ_CPU_FIQ */
822 bit_index
= __ffs(HCR_VF
);
824 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
826 set
= test_and_set_bit(bit_index
, ptr
);
828 set
= test_and_clear_bit(bit_index
, ptr
);
831 * If we didn't change anything, no need to wake up or kick other CPUs
837 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
838 * trigger a world-switch round on the running physical CPU to set the
839 * virtual IRQ/FIQ fields in the HCR appropriately.
841 kvm_make_request(KVM_REQ_IRQ_PENDING
, vcpu
);
847 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
850 u32 irq
= irq_level
->irq
;
851 unsigned int irq_type
, vcpu_idx
, irq_num
;
852 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
853 struct kvm_vcpu
*vcpu
= NULL
;
854 bool level
= irq_level
->level
;
856 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
857 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
858 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
860 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
863 case KVM_ARM_IRQ_TYPE_CPU
:
864 if (irqchip_in_kernel(kvm
))
867 if (vcpu_idx
>= nrcpus
)
870 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
874 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
877 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
878 case KVM_ARM_IRQ_TYPE_PPI
:
879 if (!irqchip_in_kernel(kvm
))
882 if (vcpu_idx
>= nrcpus
)
885 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
889 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
892 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
, NULL
);
893 case KVM_ARM_IRQ_TYPE_SPI
:
894 if (!irqchip_in_kernel(kvm
))
897 if (irq_num
< VGIC_NR_PRIVATE_IRQS
)
900 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
, NULL
);
906 static int kvm_vcpu_set_target(struct kvm_vcpu
*vcpu
,
907 const struct kvm_vcpu_init
*init
)
910 int phys_target
= kvm_target_cpu();
912 if (init
->target
!= phys_target
)
916 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
917 * use the same target.
919 if (vcpu
->arch
.target
!= -1 && vcpu
->arch
.target
!= init
->target
)
922 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
923 for (i
= 0; i
< sizeof(init
->features
) * 8; i
++) {
924 bool set
= (init
->features
[i
/ 32] & (1 << (i
% 32)));
926 if (set
&& i
>= KVM_VCPU_MAX_FEATURES
)
930 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
931 * use the same feature set.
933 if (vcpu
->arch
.target
!= -1 && i
< KVM_VCPU_MAX_FEATURES
&&
934 test_bit(i
, vcpu
->arch
.features
) != set
)
938 set_bit(i
, vcpu
->arch
.features
);
941 vcpu
->arch
.target
= phys_target
;
943 /* Now we know what it is, we can reset it. */
944 ret
= kvm_reset_vcpu(vcpu
);
946 vcpu
->arch
.target
= -1;
947 bitmap_zero(vcpu
->arch
.features
, KVM_VCPU_MAX_FEATURES
);
953 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
954 struct kvm_vcpu_init
*init
)
958 ret
= kvm_vcpu_set_target(vcpu
, init
);
963 * Ensure a rebooted VM will fault in RAM pages and detect if the
964 * guest MMU is turned off and flush the caches as needed.
966 if (vcpu
->arch
.has_run_once
)
967 stage2_unmap_vm(vcpu
->kvm
);
969 vcpu_reset_hcr(vcpu
);
972 * Handle the "start in power-off" case.
974 if (test_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
975 vcpu_power_off(vcpu
);
977 vcpu
->arch
.power_off
= false;
982 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu
*vcpu
,
983 struct kvm_device_attr
*attr
)
987 switch (attr
->group
) {
989 ret
= kvm_arm_vcpu_arch_set_attr(vcpu
, attr
);
996 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu
*vcpu
,
997 struct kvm_device_attr
*attr
)
1001 switch (attr
->group
) {
1003 ret
= kvm_arm_vcpu_arch_get_attr(vcpu
, attr
);
1010 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu
*vcpu
,
1011 struct kvm_device_attr
*attr
)
1015 switch (attr
->group
) {
1017 ret
= kvm_arm_vcpu_arch_has_attr(vcpu
, attr
);
1024 long kvm_arch_vcpu_ioctl(struct file
*filp
,
1025 unsigned int ioctl
, unsigned long arg
)
1027 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1028 void __user
*argp
= (void __user
*)arg
;
1029 struct kvm_device_attr attr
;
1032 case KVM_ARM_VCPU_INIT
: {
1033 struct kvm_vcpu_init init
;
1035 if (copy_from_user(&init
, argp
, sizeof(init
)))
1038 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
1040 case KVM_SET_ONE_REG
:
1041 case KVM_GET_ONE_REG
: {
1042 struct kvm_one_reg reg
;
1044 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
1047 if (copy_from_user(®
, argp
, sizeof(reg
)))
1049 if (ioctl
== KVM_SET_ONE_REG
)
1050 return kvm_arm_set_reg(vcpu
, ®
);
1052 return kvm_arm_get_reg(vcpu
, ®
);
1054 case KVM_GET_REG_LIST
: {
1055 struct kvm_reg_list __user
*user_list
= argp
;
1056 struct kvm_reg_list reg_list
;
1059 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
1062 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
1065 reg_list
.n
= kvm_arm_num_regs(vcpu
);
1066 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
1070 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
1072 case KVM_SET_DEVICE_ATTR
: {
1073 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
1075 return kvm_arm_vcpu_set_attr(vcpu
, &attr
);
1077 case KVM_GET_DEVICE_ATTR
: {
1078 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
1080 return kvm_arm_vcpu_get_attr(vcpu
, &attr
);
1082 case KVM_HAS_DEVICE_ATTR
: {
1083 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
1085 return kvm_arm_vcpu_has_attr(vcpu
, &attr
);
1093 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
1094 * @kvm: kvm instance
1095 * @log: slot id and address to which we copy the log
1097 * Steps 1-4 below provide general overview of dirty page logging. See
1098 * kvm_get_dirty_log_protect() function description for additional details.
1100 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1101 * always flush the TLB (step 4) even if previous step failed and the dirty
1102 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1103 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1104 * writes will be marked dirty for next log read.
1106 * 1. Take a snapshot of the bit and clear it if needed.
1107 * 2. Write protect the corresponding page.
1108 * 3. Copy the snapshot to the userspace.
1109 * 4. Flush TLB's if needed.
1111 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
1113 bool is_dirty
= false;
1116 mutex_lock(&kvm
->slots_lock
);
1118 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
1121 kvm_flush_remote_tlbs(kvm
);
1123 mutex_unlock(&kvm
->slots_lock
);
1127 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
1128 struct kvm_arm_device_addr
*dev_addr
)
1130 unsigned long dev_id
, type
;
1132 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
1133 KVM_ARM_DEVICE_ID_SHIFT
;
1134 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
1135 KVM_ARM_DEVICE_TYPE_SHIFT
;
1138 case KVM_ARM_DEVICE_VGIC_V2
:
1141 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
1147 long kvm_arch_vm_ioctl(struct file
*filp
,
1148 unsigned int ioctl
, unsigned long arg
)
1150 struct kvm
*kvm
= filp
->private_data
;
1151 void __user
*argp
= (void __user
*)arg
;
1154 case KVM_CREATE_IRQCHIP
: {
1158 mutex_lock(&kvm
->lock
);
1159 ret
= kvm_vgic_create(kvm
, KVM_DEV_TYPE_ARM_VGIC_V2
);
1160 mutex_unlock(&kvm
->lock
);
1163 case KVM_ARM_SET_DEVICE_ADDR
: {
1164 struct kvm_arm_device_addr dev_addr
;
1166 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
1168 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
1170 case KVM_ARM_PREFERRED_TARGET
: {
1172 struct kvm_vcpu_init init
;
1174 err
= kvm_vcpu_preferred_target(&init
);
1178 if (copy_to_user(argp
, &init
, sizeof(init
)))
1188 static void cpu_init_hyp_mode(void *dummy
)
1190 phys_addr_t pgd_ptr
;
1191 unsigned long hyp_stack_ptr
;
1192 unsigned long stack_page
;
1193 unsigned long vector_ptr
;
1195 /* Switch from the HYP stub to our own HYP init vector */
1196 __hyp_set_vectors(kvm_get_idmap_vector());
1198 pgd_ptr
= kvm_mmu_get_httbr();
1199 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
1200 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
1201 vector_ptr
= (unsigned long)kvm_get_hyp_vector();
1203 __cpu_init_hyp_mode(pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
1204 __cpu_init_stage2();
1207 static void cpu_hyp_reset(void)
1209 if (!is_kernel_in_hyp_mode())
1210 __hyp_reset_vectors();
1213 static void cpu_hyp_reinit(void)
1217 if (is_kernel_in_hyp_mode()) {
1219 * __cpu_init_stage2() is safe to call even if the PM
1220 * event was cancelled before the CPU was reset.
1222 __cpu_init_stage2();
1223 kvm_timer_init_vhe();
1225 cpu_init_hyp_mode(NULL
);
1228 kvm_arm_init_debug();
1231 kvm_vgic_init_cpu_hardware();
1234 static void _kvm_arch_hardware_enable(void *discard
)
1236 if (!__this_cpu_read(kvm_arm_hardware_enabled
)) {
1238 __this_cpu_write(kvm_arm_hardware_enabled
, 1);
1242 int kvm_arch_hardware_enable(void)
1244 _kvm_arch_hardware_enable(NULL
);
1248 static void _kvm_arch_hardware_disable(void *discard
)
1250 if (__this_cpu_read(kvm_arm_hardware_enabled
)) {
1252 __this_cpu_write(kvm_arm_hardware_enabled
, 0);
1256 void kvm_arch_hardware_disable(void)
1258 _kvm_arch_hardware_disable(NULL
);
1261 #ifdef CONFIG_CPU_PM
1262 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
1267 * kvm_arm_hardware_enabled is left with its old value over
1268 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1273 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1275 * don't update kvm_arm_hardware_enabled here
1276 * so that the hardware will be re-enabled
1277 * when we resume. See below.
1282 case CPU_PM_ENTER_FAILED
:
1284 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1285 /* The hardware was enabled before suspend. */
1295 static struct notifier_block hyp_init_cpu_pm_nb
= {
1296 .notifier_call
= hyp_init_cpu_pm_notifier
,
1299 static void __init
hyp_cpu_pm_init(void)
1301 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
1303 static void __init
hyp_cpu_pm_exit(void)
1305 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb
);
1308 static inline void hyp_cpu_pm_init(void)
1311 static inline void hyp_cpu_pm_exit(void)
1316 static int init_common_resources(void)
1318 /* set size of VMID supported by CPU */
1319 kvm_vmid_bits
= kvm_get_vmid_bits();
1320 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1325 static int init_subsystems(void)
1330 * Enable hardware so that subsystem initialisation can access EL2.
1332 on_each_cpu(_kvm_arch_hardware_enable
, NULL
, 1);
1335 * Register CPU lower-power notifier
1340 * Init HYP view of VGIC
1342 err
= kvm_vgic_hyp_init();
1345 vgic_present
= true;
1349 vgic_present
= false;
1357 * Init HYP architected timer support
1359 err
= kvm_timer_hyp_init(vgic_present
);
1364 kvm_coproc_table_init();
1367 on_each_cpu(_kvm_arch_hardware_disable
, NULL
, 1);
1372 static void teardown_hyp_mode(void)
1377 for_each_possible_cpu(cpu
)
1378 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
1383 * Inits Hyp-mode on all online CPUs
1385 static int init_hyp_mode(void)
1391 * Allocate Hyp PGD and setup Hyp identity mapping
1393 err
= kvm_mmu_init();
1398 * Allocate stack pages for Hypervisor-mode
1400 for_each_possible_cpu(cpu
) {
1401 unsigned long stack_page
;
1403 stack_page
= __get_free_page(GFP_KERNEL
);
1409 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
1413 * Map the Hyp-code called directly from the host
1415 err
= create_hyp_mappings(kvm_ksym_ref(__hyp_text_start
),
1416 kvm_ksym_ref(__hyp_text_end
), PAGE_HYP_EXEC
);
1418 kvm_err("Cannot map world-switch code\n");
1422 err
= create_hyp_mappings(kvm_ksym_ref(__start_rodata
),
1423 kvm_ksym_ref(__end_rodata
), PAGE_HYP_RO
);
1425 kvm_err("Cannot map rodata section\n");
1429 err
= create_hyp_mappings(kvm_ksym_ref(__bss_start
),
1430 kvm_ksym_ref(__bss_stop
), PAGE_HYP_RO
);
1432 kvm_err("Cannot map bss section\n");
1436 err
= kvm_map_vectors();
1438 kvm_err("Cannot map vectors\n");
1443 * Map the Hyp stack pages
1445 for_each_possible_cpu(cpu
) {
1446 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
1447 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
,
1451 kvm_err("Cannot map hyp stack\n");
1456 for_each_possible_cpu(cpu
) {
1457 kvm_cpu_context_t
*cpu_ctxt
;
1459 cpu_ctxt
= per_cpu_ptr(&kvm_host_cpu_state
, cpu
);
1460 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1, PAGE_HYP
);
1463 kvm_err("Cannot map host CPU state: %d\n", err
);
1468 err
= hyp_map_aux_data();
1470 kvm_err("Cannot map host auxilary data: %d\n", err
);
1475 teardown_hyp_mode();
1476 kvm_err("error initializing Hyp mode: %d\n", err
);
1480 static void check_kvm_target_cpu(void *ret
)
1482 *(int *)ret
= kvm_target_cpu();
1485 struct kvm_vcpu
*kvm_mpidr_to_vcpu(struct kvm
*kvm
, unsigned long mpidr
)
1487 struct kvm_vcpu
*vcpu
;
1490 mpidr
&= MPIDR_HWID_BITMASK
;
1491 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1492 if (mpidr
== kvm_vcpu_get_mpidr_aff(vcpu
))
1498 bool kvm_arch_has_irq_bypass(void)
1503 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer
*cons
,
1504 struct irq_bypass_producer
*prod
)
1506 struct kvm_kernel_irqfd
*irqfd
=
1507 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
1509 return kvm_vgic_v4_set_forwarding(irqfd
->kvm
, prod
->irq
,
1512 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer
*cons
,
1513 struct irq_bypass_producer
*prod
)
1515 struct kvm_kernel_irqfd
*irqfd
=
1516 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
1518 kvm_vgic_v4_unset_forwarding(irqfd
->kvm
, prod
->irq
,
1522 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer
*cons
)
1524 struct kvm_kernel_irqfd
*irqfd
=
1525 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
1527 kvm_arm_halt_guest(irqfd
->kvm
);
1530 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer
*cons
)
1532 struct kvm_kernel_irqfd
*irqfd
=
1533 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
1535 kvm_arm_resume_guest(irqfd
->kvm
);
1539 * Initialize Hyp-mode and memory mappings on all CPUs.
1541 int kvm_arch_init(void *opaque
)
1547 if (!is_hyp_mode_available()) {
1548 kvm_info("HYP mode not available\n");
1552 for_each_online_cpu(cpu
) {
1553 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1555 kvm_err("Error, CPU %d not supported!\n", cpu
);
1560 err
= init_common_resources();
1564 in_hyp_mode
= is_kernel_in_hyp_mode();
1567 err
= init_hyp_mode();
1572 err
= init_subsystems();
1577 kvm_info("VHE mode initialized successfully\n");
1579 kvm_info("Hyp mode initialized successfully\n");
1585 teardown_hyp_mode();
1590 /* NOP: Compiling as a module not supported */
1591 void kvm_arch_exit(void)
1593 kvm_perf_teardown();
1596 static int arm_init(void)
1598 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1602 module_init(arm_init
);