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>
47 #include <asm/sections.h>
50 __asm__(".arch_extension virt");
53 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page
);
54 static kvm_cpu_context_t __percpu
*kvm_host_cpu_state
;
55 static unsigned long hyp_default_vectors
;
57 /* Per-CPU variable containing the currently running vcpu. */
58 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_arm_running_vcpu
);
60 /* The VMID used in the VTTBR */
61 static atomic64_t kvm_vmid_gen
= ATOMIC64_INIT(1);
62 static u32 kvm_next_vmid
;
63 static unsigned int kvm_vmid_bits __read_mostly
;
64 static DEFINE_SPINLOCK(kvm_vmid_lock
);
66 static bool vgic_present
;
68 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
70 BUG_ON(preemptible());
71 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
75 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
76 * Must be called from non-preemptible context
78 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
80 BUG_ON(preemptible());
81 return __this_cpu_read(kvm_arm_running_vcpu
);
85 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
87 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
89 return &kvm_arm_running_vcpu
;
92 int kvm_arch_hardware_enable(void)
97 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
99 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
102 int kvm_arch_hardware_setup(void)
107 void kvm_arch_check_processor_compat(void *rtn
)
114 * kvm_arch_init_vm - initializes a VM data structure
115 * @kvm: pointer to the KVM struct
117 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
124 ret
= kvm_alloc_stage2_pgd(kvm
);
128 ret
= create_hyp_mappings(kvm
, kvm
+ 1);
130 goto out_free_stage2_pgd
;
132 kvm_vgic_early_init(kvm
);
135 /* Mark the initial VMID generation invalid */
136 kvm
->arch
.vmid_gen
= 0;
138 /* The maximum number of VCPUs is limited by the host's GIC model */
139 kvm
->arch
.max_vcpus
= vgic_present
?
140 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS
;
144 kvm_free_stage2_pgd(kvm
);
149 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
151 return VM_FAULT_SIGBUS
;
156 * kvm_arch_destroy_vm - destroy the VM data structure
157 * @kvm: pointer to the KVM struct
159 void kvm_arch_destroy_vm(struct kvm
*kvm
)
163 kvm_free_stage2_pgd(kvm
);
165 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
167 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
168 kvm
->vcpus
[i
] = NULL
;
172 kvm_vgic_destroy(kvm
);
175 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
179 case KVM_CAP_IRQCHIP
:
182 case KVM_CAP_IOEVENTFD
:
183 case KVM_CAP_DEVICE_CTRL
:
184 case KVM_CAP_USER_MEMORY
:
185 case KVM_CAP_SYNC_MMU
:
186 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
187 case KVM_CAP_ONE_REG
:
188 case KVM_CAP_ARM_PSCI
:
189 case KVM_CAP_ARM_PSCI_0_2
:
190 case KVM_CAP_READONLY_MEM
:
191 case KVM_CAP_MP_STATE
:
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 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
)) {
230 if (id
>= kvm
->arch
.max_vcpus
) {
235 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
241 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
245 err
= create_hyp_mappings(vcpu
, vcpu
+ 1);
251 kvm_vcpu_uninit(vcpu
);
253 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
258 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
260 kvm_vgic_vcpu_early_init(vcpu
);
263 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
265 kvm_mmu_free_memory_caches(vcpu
);
266 kvm_timer_vcpu_terminate(vcpu
);
267 kvm_vgic_vcpu_destroy(vcpu
);
268 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
271 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
273 kvm_arch_vcpu_free(vcpu
);
276 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
278 return kvm_timer_should_fire(vcpu
);
281 void kvm_arch_vcpu_blocking(struct kvm_vcpu
*vcpu
)
283 kvm_timer_schedule(vcpu
);
286 void kvm_arch_vcpu_unblocking(struct kvm_vcpu
*vcpu
)
288 kvm_timer_unschedule(vcpu
);
291 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
293 /* Force users to call KVM_ARM_VCPU_INIT */
294 vcpu
->arch
.target
= -1;
295 bitmap_zero(vcpu
->arch
.features
, KVM_VCPU_MAX_FEATURES
);
297 /* Set up the timer */
298 kvm_timer_vcpu_init(vcpu
);
300 kvm_arm_reset_debug_ptr(vcpu
);
305 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
308 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(kvm_host_cpu_state
);
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_get_mpstate(struct kvm_vcpu
*vcpu
,
326 struct kvm_mp_state
*mp_state
)
328 if (vcpu
->arch
.power_off
)
329 mp_state
->mp_state
= KVM_MP_STATE_STOPPED
;
331 mp_state
->mp_state
= KVM_MP_STATE_RUNNABLE
;
336 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
337 struct kvm_mp_state
*mp_state
)
339 switch (mp_state
->mp_state
) {
340 case KVM_MP_STATE_RUNNABLE
:
341 vcpu
->arch
.power_off
= false;
343 case KVM_MP_STATE_STOPPED
:
344 vcpu
->arch
.power_off
= true;
354 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
355 * @v: The VCPU pointer
357 * If the guest CPU is not waiting for interrupts or an interrupt line is
358 * asserted, the CPU is by definition runnable.
360 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
362 return ((!!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
))
363 && !v
->arch
.power_off
&& !v
->arch
.pause
);
366 /* Just ensure a guest exit from a particular CPU */
367 static void exit_vm_noop(void *info
)
371 void force_vm_exit(const cpumask_t
*mask
)
373 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
377 * need_new_vmid_gen - check that the VMID is still valid
378 * @kvm: The VM's VMID to checkt
380 * return true if there is a new generation of VMIDs being used
382 * The hardware supports only 256 values with the value zero reserved for the
383 * host, so we check if an assigned value belongs to a previous generation,
384 * which which requires us to assign a new value. If we're the first to use a
385 * VMID for the new generation, we must flush necessary caches and TLBs on all
388 static bool need_new_vmid_gen(struct kvm
*kvm
)
390 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
394 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
395 * @kvm The guest that we are about to run
397 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
398 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
401 static void update_vttbr(struct kvm
*kvm
)
403 phys_addr_t pgd_phys
;
406 if (!need_new_vmid_gen(kvm
))
409 spin_lock(&kvm_vmid_lock
);
412 * We need to re-check the vmid_gen here to ensure that if another vcpu
413 * already allocated a valid vmid for this vm, then this vcpu should
416 if (!need_new_vmid_gen(kvm
)) {
417 spin_unlock(&kvm_vmid_lock
);
421 /* First user of a new VMID generation? */
422 if (unlikely(kvm_next_vmid
== 0)) {
423 atomic64_inc(&kvm_vmid_gen
);
427 * On SMP we know no other CPUs can use this CPU's or each
428 * other's VMID after force_vm_exit returns since the
429 * kvm_vmid_lock blocks them from reentry to the guest.
431 force_vm_exit(cpu_all_mask
);
433 * Now broadcast TLB + ICACHE invalidation over the inner
434 * shareable domain to make sure all data structures are
437 kvm_call_hyp(__kvm_flush_vm_context
);
440 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
441 kvm
->arch
.vmid
= kvm_next_vmid
;
443 kvm_next_vmid
&= (1 << kvm_vmid_bits
) - 1;
445 /* update vttbr to be used with the new vmid */
446 pgd_phys
= virt_to_phys(kvm_get_hwpgd(kvm
));
447 BUG_ON(pgd_phys
& ~VTTBR_BADDR_MASK
);
448 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK(kvm_vmid_bits
);
449 kvm
->arch
.vttbr
= pgd_phys
| vmid
;
451 spin_unlock(&kvm_vmid_lock
);
454 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
456 struct kvm
*kvm
= vcpu
->kvm
;
459 if (likely(vcpu
->arch
.has_run_once
))
462 vcpu
->arch
.has_run_once
= true;
465 * Map the VGIC hardware resources before running a vcpu the first
468 if (unlikely(irqchip_in_kernel(kvm
) && !vgic_ready(kvm
))) {
469 ret
= kvm_vgic_map_resources(kvm
);
475 * Enable the arch timers only if we have an in-kernel VGIC
476 * and it has been properly initialized, since we cannot handle
477 * interrupts from the virtual timer with a userspace gic.
479 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
))
480 kvm_timer_enable(kvm
);
485 bool kvm_arch_intc_initialized(struct kvm
*kvm
)
487 return vgic_initialized(kvm
);
490 static void kvm_arm_halt_guest(struct kvm
*kvm
) __maybe_unused
;
491 static void kvm_arm_resume_guest(struct kvm
*kvm
) __maybe_unused
;
493 static void kvm_arm_halt_guest(struct kvm
*kvm
)
496 struct kvm_vcpu
*vcpu
;
498 kvm_for_each_vcpu(i
, vcpu
, kvm
)
499 vcpu
->arch
.pause
= true;
500 force_vm_exit(cpu_all_mask
);
503 static void kvm_arm_resume_guest(struct kvm
*kvm
)
506 struct kvm_vcpu
*vcpu
;
508 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
509 wait_queue_head_t
*wq
= kvm_arch_vcpu_wq(vcpu
);
511 vcpu
->arch
.pause
= false;
512 wake_up_interruptible(wq
);
516 static void vcpu_sleep(struct kvm_vcpu
*vcpu
)
518 wait_queue_head_t
*wq
= kvm_arch_vcpu_wq(vcpu
);
520 wait_event_interruptible(*wq
, ((!vcpu
->arch
.power_off
) &&
521 (!vcpu
->arch
.pause
)));
524 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
526 return vcpu
->arch
.target
>= 0;
530 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
531 * @vcpu: The VCPU pointer
532 * @run: The kvm_run structure pointer used for userspace state exchange
534 * This function is called through the VCPU_RUN ioctl called from user space. It
535 * will execute VM code in a loop until the time slice for the process is used
536 * or some emulation is needed from user space in which case the function will
537 * return with return value 0 and with the kvm_run structure filled in with the
538 * required data for the requested emulation.
540 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
545 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
548 ret
= kvm_vcpu_first_run_init(vcpu
);
552 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
553 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
558 if (vcpu
->sigset_active
)
559 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
562 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
565 * Check conditions before entering the guest
569 update_vttbr(vcpu
->kvm
);
571 if (vcpu
->arch
.power_off
|| vcpu
->arch
.pause
)
575 * Preparing the interrupts to be injected also
576 * involves poking the GIC, which must be done in a
577 * non-preemptible context.
580 kvm_timer_flush_hwstate(vcpu
);
581 kvm_vgic_flush_hwstate(vcpu
);
586 * Re-check atomic conditions
588 if (signal_pending(current
)) {
590 run
->exit_reason
= KVM_EXIT_INTR
;
593 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
) ||
594 vcpu
->arch
.power_off
|| vcpu
->arch
.pause
) {
596 kvm_timer_sync_hwstate(vcpu
);
597 kvm_vgic_sync_hwstate(vcpu
);
602 kvm_arm_setup_debug(vcpu
);
604 /**************************************************************
607 trace_kvm_entry(*vcpu_pc(vcpu
));
609 vcpu
->mode
= IN_GUEST_MODE
;
611 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
613 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
617 *************************************************************/
619 kvm_arm_clear_debug(vcpu
);
622 * We may have taken a host interrupt in HYP mode (ie
623 * while executing the guest). This interrupt is still
624 * pending, as we haven't serviced it yet!
626 * We're now back in SVC mode, with interrupts
627 * disabled. Enabling the interrupts now will have
628 * the effect of taking the interrupt again, in SVC
634 * We do local_irq_enable() before calling kvm_guest_exit() so
635 * that if a timer interrupt hits while running the guest we
636 * account that tick as being spent in the guest. We enable
637 * preemption after calling kvm_guest_exit() so that if we get
638 * preempted we make sure ticks after that is not counted as
642 trace_kvm_exit(ret
, kvm_vcpu_trap_get_class(vcpu
), *vcpu_pc(vcpu
));
645 * We must sync the timer state before the vgic state so that
646 * the vgic can properly sample the updated state of the
649 kvm_timer_sync_hwstate(vcpu
);
651 kvm_vgic_sync_hwstate(vcpu
);
655 ret
= handle_exit(vcpu
, run
, ret
);
658 if (vcpu
->sigset_active
)
659 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
663 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
669 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
670 bit_index
= __ffs(HCR_VI
);
671 else /* KVM_ARM_IRQ_CPU_FIQ */
672 bit_index
= __ffs(HCR_VF
);
674 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
676 set
= test_and_set_bit(bit_index
, ptr
);
678 set
= test_and_clear_bit(bit_index
, ptr
);
681 * If we didn't change anything, no need to wake up or kick other CPUs
687 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
688 * trigger a world-switch round on the running physical CPU to set the
689 * virtual IRQ/FIQ fields in the HCR appropriately.
696 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
699 u32 irq
= irq_level
->irq
;
700 unsigned int irq_type
, vcpu_idx
, irq_num
;
701 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
702 struct kvm_vcpu
*vcpu
= NULL
;
703 bool level
= irq_level
->level
;
705 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
706 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
707 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
709 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
712 case KVM_ARM_IRQ_TYPE_CPU
:
713 if (irqchip_in_kernel(kvm
))
716 if (vcpu_idx
>= nrcpus
)
719 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
723 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
726 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
727 case KVM_ARM_IRQ_TYPE_PPI
:
728 if (!irqchip_in_kernel(kvm
))
731 if (vcpu_idx
>= nrcpus
)
734 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
738 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
741 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
742 case KVM_ARM_IRQ_TYPE_SPI
:
743 if (!irqchip_in_kernel(kvm
))
746 if (irq_num
< VGIC_NR_PRIVATE_IRQS
)
749 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
755 static int kvm_vcpu_set_target(struct kvm_vcpu
*vcpu
,
756 const struct kvm_vcpu_init
*init
)
759 int phys_target
= kvm_target_cpu();
761 if (init
->target
!= phys_target
)
765 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
766 * use the same target.
768 if (vcpu
->arch
.target
!= -1 && vcpu
->arch
.target
!= init
->target
)
771 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
772 for (i
= 0; i
< sizeof(init
->features
) * 8; i
++) {
773 bool set
= (init
->features
[i
/ 32] & (1 << (i
% 32)));
775 if (set
&& i
>= KVM_VCPU_MAX_FEATURES
)
779 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
780 * use the same feature set.
782 if (vcpu
->arch
.target
!= -1 && i
< KVM_VCPU_MAX_FEATURES
&&
783 test_bit(i
, vcpu
->arch
.features
) != set
)
787 set_bit(i
, vcpu
->arch
.features
);
790 vcpu
->arch
.target
= phys_target
;
792 /* Now we know what it is, we can reset it. */
793 return kvm_reset_vcpu(vcpu
);
797 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
798 struct kvm_vcpu_init
*init
)
802 ret
= kvm_vcpu_set_target(vcpu
, init
);
807 * Ensure a rebooted VM will fault in RAM pages and detect if the
808 * guest MMU is turned off and flush the caches as needed.
810 if (vcpu
->arch
.has_run_once
)
811 stage2_unmap_vm(vcpu
->kvm
);
813 vcpu_reset_hcr(vcpu
);
816 * Handle the "start in power-off" case.
818 if (test_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
819 vcpu
->arch
.power_off
= true;
821 vcpu
->arch
.power_off
= false;
826 long kvm_arch_vcpu_ioctl(struct file
*filp
,
827 unsigned int ioctl
, unsigned long arg
)
829 struct kvm_vcpu
*vcpu
= filp
->private_data
;
830 void __user
*argp
= (void __user
*)arg
;
833 case KVM_ARM_VCPU_INIT
: {
834 struct kvm_vcpu_init init
;
836 if (copy_from_user(&init
, argp
, sizeof(init
)))
839 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
841 case KVM_SET_ONE_REG
:
842 case KVM_GET_ONE_REG
: {
843 struct kvm_one_reg reg
;
845 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
848 if (copy_from_user(®
, argp
, sizeof(reg
)))
850 if (ioctl
== KVM_SET_ONE_REG
)
851 return kvm_arm_set_reg(vcpu
, ®
);
853 return kvm_arm_get_reg(vcpu
, ®
);
855 case KVM_GET_REG_LIST
: {
856 struct kvm_reg_list __user
*user_list
= argp
;
857 struct kvm_reg_list reg_list
;
860 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
863 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
866 reg_list
.n
= kvm_arm_num_regs(vcpu
);
867 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
871 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
879 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
881 * @log: slot id and address to which we copy the log
883 * Steps 1-4 below provide general overview of dirty page logging. See
884 * kvm_get_dirty_log_protect() function description for additional details.
886 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
887 * always flush the TLB (step 4) even if previous step failed and the dirty
888 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
889 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
890 * writes will be marked dirty for next log read.
892 * 1. Take a snapshot of the bit and clear it if needed.
893 * 2. Write protect the corresponding page.
894 * 3. Copy the snapshot to the userspace.
895 * 4. Flush TLB's if needed.
897 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
899 bool is_dirty
= false;
902 mutex_lock(&kvm
->slots_lock
);
904 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
907 kvm_flush_remote_tlbs(kvm
);
909 mutex_unlock(&kvm
->slots_lock
);
913 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
914 struct kvm_arm_device_addr
*dev_addr
)
916 unsigned long dev_id
, type
;
918 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
919 KVM_ARM_DEVICE_ID_SHIFT
;
920 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
921 KVM_ARM_DEVICE_TYPE_SHIFT
;
924 case KVM_ARM_DEVICE_VGIC_V2
:
927 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
933 long kvm_arch_vm_ioctl(struct file
*filp
,
934 unsigned int ioctl
, unsigned long arg
)
936 struct kvm
*kvm
= filp
->private_data
;
937 void __user
*argp
= (void __user
*)arg
;
940 case KVM_CREATE_IRQCHIP
: {
943 return kvm_vgic_create(kvm
, KVM_DEV_TYPE_ARM_VGIC_V2
);
945 case KVM_ARM_SET_DEVICE_ADDR
: {
946 struct kvm_arm_device_addr dev_addr
;
948 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
950 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
952 case KVM_ARM_PREFERRED_TARGET
: {
954 struct kvm_vcpu_init init
;
956 err
= kvm_vcpu_preferred_target(&init
);
960 if (copy_to_user(argp
, &init
, sizeof(init
)))
970 static void cpu_init_hyp_mode(void *dummy
)
972 phys_addr_t boot_pgd_ptr
;
974 unsigned long hyp_stack_ptr
;
975 unsigned long stack_page
;
976 unsigned long vector_ptr
;
978 /* Switch from the HYP stub to our own HYP init vector */
979 __hyp_set_vectors(kvm_get_idmap_vector());
981 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
982 pgd_ptr
= kvm_mmu_get_httbr();
983 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
984 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
985 vector_ptr
= (unsigned long)__kvm_hyp_vector
;
987 __cpu_init_hyp_mode(boot_pgd_ptr
, pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
989 kvm_arm_init_debug();
992 static int hyp_init_cpu_notify(struct notifier_block
*self
,
993 unsigned long action
, void *cpu
)
997 case CPU_STARTING_FROZEN
:
998 if (__hyp_get_vectors() == hyp_default_vectors
)
999 cpu_init_hyp_mode(NULL
);
1006 static struct notifier_block hyp_init_cpu_nb
= {
1007 .notifier_call
= hyp_init_cpu_notify
,
1010 #ifdef CONFIG_CPU_PM
1011 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
1015 if (cmd
== CPU_PM_EXIT
&&
1016 __hyp_get_vectors() == hyp_default_vectors
) {
1017 cpu_init_hyp_mode(NULL
);
1024 static struct notifier_block hyp_init_cpu_pm_nb
= {
1025 .notifier_call
= hyp_init_cpu_pm_notifier
,
1028 static void __init
hyp_cpu_pm_init(void)
1030 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
1033 static inline void hyp_cpu_pm_init(void)
1039 * Inits Hyp-mode on all online CPUs
1041 static int init_hyp_mode(void)
1047 * Allocate Hyp PGD and setup Hyp identity mapping
1049 err
= kvm_mmu_init();
1054 * It is probably enough to obtain the default on one
1055 * CPU. It's unlikely to be different on the others.
1057 hyp_default_vectors
= __hyp_get_vectors();
1060 * Allocate stack pages for Hypervisor-mode
1062 for_each_possible_cpu(cpu
) {
1063 unsigned long stack_page
;
1065 stack_page
= __get_free_page(GFP_KERNEL
);
1068 goto out_free_stack_pages
;
1071 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
1075 * Map the Hyp-code called directly from the host
1077 err
= create_hyp_mappings(__kvm_hyp_code_start
, __kvm_hyp_code_end
);
1079 kvm_err("Cannot map world-switch code\n");
1080 goto out_free_mappings
;
1083 err
= create_hyp_mappings(__start_rodata
, __end_rodata
);
1085 kvm_err("Cannot map rodata section\n");
1086 goto out_free_mappings
;
1090 * Map the Hyp stack pages
1092 for_each_possible_cpu(cpu
) {
1093 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
1094 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
);
1097 kvm_err("Cannot map hyp stack\n");
1098 goto out_free_mappings
;
1103 * Map the host CPU structures
1105 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
1106 if (!kvm_host_cpu_state
) {
1108 kvm_err("Cannot allocate host CPU state\n");
1109 goto out_free_mappings
;
1112 for_each_possible_cpu(cpu
) {
1113 kvm_cpu_context_t
*cpu_ctxt
;
1115 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
1116 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1);
1119 kvm_err("Cannot map host CPU state: %d\n", err
);
1120 goto out_free_context
;
1125 * Execute the init code on each CPU.
1127 on_each_cpu(cpu_init_hyp_mode
, NULL
, 1);
1130 * Init HYP view of VGIC
1132 err
= kvm_vgic_hyp_init();
1135 vgic_present
= true;
1139 vgic_present
= false;
1142 goto out_free_context
;
1146 * Init HYP architected timer support
1148 err
= kvm_timer_hyp_init();
1150 goto out_free_context
;
1152 #ifndef CONFIG_HOTPLUG_CPU
1153 free_boot_hyp_pgd();
1158 /* set size of VMID supported by CPU */
1159 kvm_vmid_bits
= kvm_get_vmid_bits();
1160 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1162 kvm_info("Hyp mode initialized successfully\n");
1166 free_percpu(kvm_host_cpu_state
);
1169 out_free_stack_pages
:
1170 for_each_possible_cpu(cpu
)
1171 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
1173 kvm_err("error initializing Hyp mode: %d\n", err
);
1177 static void check_kvm_target_cpu(void *ret
)
1179 *(int *)ret
= kvm_target_cpu();
1182 struct kvm_vcpu
*kvm_mpidr_to_vcpu(struct kvm
*kvm
, unsigned long mpidr
)
1184 struct kvm_vcpu
*vcpu
;
1187 mpidr
&= MPIDR_HWID_BITMASK
;
1188 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1189 if (mpidr
== kvm_vcpu_get_mpidr_aff(vcpu
))
1196 * Initialize Hyp-mode and memory mappings on all CPUs.
1198 int kvm_arch_init(void *opaque
)
1203 if (!is_hyp_mode_available()) {
1204 kvm_err("HYP mode not available\n");
1208 for_each_online_cpu(cpu
) {
1209 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1211 kvm_err("Error, CPU %d not supported!\n", cpu
);
1216 cpu_notifier_register_begin();
1218 err
= init_hyp_mode();
1222 err
= __register_cpu_notifier(&hyp_init_cpu_nb
);
1224 kvm_err("Cannot register HYP init CPU notifier (%d)\n", err
);
1228 cpu_notifier_register_done();
1232 kvm_coproc_table_init();
1235 cpu_notifier_register_done();
1239 /* NOP: Compiling as a module not supported */
1240 void kvm_arch_exit(void)
1242 kvm_perf_teardown();
1245 static int arm_init(void)
1247 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1251 module_init(arm_init
);