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 <trace/events/kvm.h>
31 #include <kvm/arm_pmu.h>
33 #define CREATE_TRACE_POINTS
36 #include <asm/uaccess.h>
37 #include <asm/ptrace.h>
39 #include <asm/tlbflush.h>
40 #include <asm/cacheflush.h>
42 #include <asm/kvm_arm.h>
43 #include <asm/kvm_asm.h>
44 #include <asm/kvm_mmu.h>
45 #include <asm/kvm_emulate.h>
46 #include <asm/kvm_coproc.h>
47 #include <asm/kvm_psci.h>
48 #include <asm/sections.h>
51 __asm__(".arch_extension virt");
54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page
);
55 static kvm_cpu_context_t __percpu
*kvm_host_cpu_state
;
56 static unsigned long hyp_default_vectors
;
58 /* Per-CPU variable containing the currently running vcpu. */
59 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_arm_running_vcpu
);
61 /* The VMID used in the VTTBR */
62 static atomic64_t kvm_vmid_gen
= ATOMIC64_INIT(1);
63 static u32 kvm_next_vmid
;
64 static unsigned int kvm_vmid_bits __read_mostly
;
65 static DEFINE_SPINLOCK(kvm_vmid_lock
);
67 static bool vgic_present
;
69 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled
);
71 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
73 BUG_ON(preemptible());
74 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
78 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
79 * Must be called from non-preemptible context
81 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
83 BUG_ON(preemptible());
84 return __this_cpu_read(kvm_arm_running_vcpu
);
88 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
90 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
92 return &kvm_arm_running_vcpu
;
95 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
97 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
100 int kvm_arch_hardware_setup(void)
105 void kvm_arch_check_processor_compat(void *rtn
)
112 * kvm_arch_init_vm - initializes a VM data structure
113 * @kvm: pointer to the KVM struct
115 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
122 ret
= kvm_alloc_stage2_pgd(kvm
);
126 ret
= create_hyp_mappings(kvm
, kvm
+ 1, PAGE_HYP
);
128 goto out_free_stage2_pgd
;
130 kvm_vgic_early_init(kvm
);
133 /* Mark the initial VMID generation invalid */
134 kvm
->arch
.vmid_gen
= 0;
136 /* The maximum number of VCPUs is limited by the host's GIC model */
137 kvm
->arch
.max_vcpus
= vgic_present
?
138 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS
;
142 kvm_free_stage2_pgd(kvm
);
147 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
149 return VM_FAULT_SIGBUS
;
154 * kvm_arch_destroy_vm - destroy the VM data structure
155 * @kvm: pointer to the KVM struct
157 void kvm_arch_destroy_vm(struct kvm
*kvm
)
161 kvm_free_stage2_pgd(kvm
);
163 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
165 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
166 kvm
->vcpus
[i
] = NULL
;
170 kvm_vgic_destroy(kvm
);
173 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
177 case KVM_CAP_IRQCHIP
:
180 case KVM_CAP_IOEVENTFD
:
181 case KVM_CAP_DEVICE_CTRL
:
182 case KVM_CAP_USER_MEMORY
:
183 case KVM_CAP_SYNC_MMU
:
184 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
185 case KVM_CAP_ONE_REG
:
186 case KVM_CAP_ARM_PSCI
:
187 case KVM_CAP_ARM_PSCI_0_2
:
188 case KVM_CAP_READONLY_MEM
:
189 case KVM_CAP_MP_STATE
:
192 case KVM_CAP_COALESCED_MMIO
:
193 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
195 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
198 case KVM_CAP_NR_VCPUS
:
199 r
= num_online_cpus();
201 case KVM_CAP_MAX_VCPUS
:
205 r
= kvm_arch_dev_ioctl_check_extension(kvm
, ext
);
211 long kvm_arch_dev_ioctl(struct file
*filp
,
212 unsigned int ioctl
, unsigned long arg
)
218 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
221 struct kvm_vcpu
*vcpu
;
223 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
)) {
228 if (id
>= kvm
->arch
.max_vcpus
) {
233 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
239 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
243 err
= create_hyp_mappings(vcpu
, vcpu
+ 1, PAGE_HYP
);
249 kvm_vcpu_uninit(vcpu
);
251 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
256 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
258 kvm_vgic_vcpu_early_init(vcpu
);
261 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
263 kvm_mmu_free_memory_caches(vcpu
);
264 kvm_timer_vcpu_terminate(vcpu
);
265 kvm_vgic_vcpu_destroy(vcpu
);
266 kvm_pmu_vcpu_destroy(vcpu
);
267 kvm_vcpu_uninit(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
);
323 kvm_timer_vcpu_put(vcpu
);
326 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
327 struct kvm_mp_state
*mp_state
)
329 if (vcpu
->arch
.power_off
)
330 mp_state
->mp_state
= KVM_MP_STATE_STOPPED
;
332 mp_state
->mp_state
= KVM_MP_STATE_RUNNABLE
;
337 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
338 struct kvm_mp_state
*mp_state
)
340 switch (mp_state
->mp_state
) {
341 case KVM_MP_STATE_RUNNABLE
:
342 vcpu
->arch
.power_off
= false;
344 case KVM_MP_STATE_STOPPED
:
345 vcpu
->arch
.power_off
= true;
355 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
356 * @v: The VCPU pointer
358 * If the guest CPU is not waiting for interrupts or an interrupt line is
359 * asserted, the CPU is by definition runnable.
361 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*v
)
363 return ((!!v
->arch
.irq_lines
|| kvm_vgic_vcpu_pending_irq(v
))
364 && !v
->arch
.power_off
&& !v
->arch
.pause
);
367 /* Just ensure a guest exit from a particular CPU */
368 static void exit_vm_noop(void *info
)
372 void force_vm_exit(const cpumask_t
*mask
)
375 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
380 * need_new_vmid_gen - check that the VMID is still valid
381 * @kvm: The VM's VMID to check
383 * return true if there is a new generation of VMIDs being used
385 * The hardware supports only 256 values with the value zero reserved for the
386 * host, so we check if an assigned value belongs to a previous generation,
387 * which which requires us to assign a new value. If we're the first to use a
388 * VMID for the new generation, we must flush necessary caches and TLBs on all
391 static bool need_new_vmid_gen(struct kvm
*kvm
)
393 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
397 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
398 * @kvm The guest that we are about to run
400 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
401 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
404 static void update_vttbr(struct kvm
*kvm
)
406 phys_addr_t pgd_phys
;
409 if (!need_new_vmid_gen(kvm
))
412 spin_lock(&kvm_vmid_lock
);
415 * We need to re-check the vmid_gen here to ensure that if another vcpu
416 * already allocated a valid vmid for this vm, then this vcpu should
419 if (!need_new_vmid_gen(kvm
)) {
420 spin_unlock(&kvm_vmid_lock
);
424 /* First user of a new VMID generation? */
425 if (unlikely(kvm_next_vmid
== 0)) {
426 atomic64_inc(&kvm_vmid_gen
);
430 * On SMP we know no other CPUs can use this CPU's or each
431 * other's VMID after force_vm_exit returns since the
432 * kvm_vmid_lock blocks them from reentry to the guest.
434 force_vm_exit(cpu_all_mask
);
436 * Now broadcast TLB + ICACHE invalidation over the inner
437 * shareable domain to make sure all data structures are
440 kvm_call_hyp(__kvm_flush_vm_context
);
443 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
444 kvm
->arch
.vmid
= kvm_next_vmid
;
446 kvm_next_vmid
&= (1 << kvm_vmid_bits
) - 1;
448 /* update vttbr to be used with the new vmid */
449 pgd_phys
= virt_to_phys(kvm
->arch
.pgd
);
450 BUG_ON(pgd_phys
& ~VTTBR_BADDR_MASK
);
451 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK(kvm_vmid_bits
);
452 kvm
->arch
.vttbr
= pgd_phys
| vmid
;
454 spin_unlock(&kvm_vmid_lock
);
457 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
459 struct kvm
*kvm
= vcpu
->kvm
;
462 if (likely(vcpu
->arch
.has_run_once
))
465 vcpu
->arch
.has_run_once
= true;
468 * Map the VGIC hardware resources before running a vcpu the first
471 if (unlikely(irqchip_in_kernel(kvm
) && !vgic_ready(kvm
))) {
472 ret
= kvm_vgic_map_resources(kvm
);
478 * Enable the arch timers only if we have an in-kernel VGIC
479 * and it has been properly initialized, since we cannot handle
480 * interrupts from the virtual timer with a userspace gic.
482 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
))
483 ret
= kvm_timer_enable(vcpu
);
488 bool kvm_arch_intc_initialized(struct kvm
*kvm
)
490 return vgic_initialized(kvm
);
493 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 kvm_make_all_cpus_request(kvm
, KVM_REQ_VCPU_EXIT
);
503 void kvm_arm_halt_vcpu(struct kvm_vcpu
*vcpu
)
505 vcpu
->arch
.pause
= true;
509 void kvm_arm_resume_vcpu(struct kvm_vcpu
*vcpu
)
511 struct swait_queue_head
*wq
= kvm_arch_vcpu_wq(vcpu
);
513 vcpu
->arch
.pause
= false;
517 void kvm_arm_resume_guest(struct kvm
*kvm
)
520 struct kvm_vcpu
*vcpu
;
522 kvm_for_each_vcpu(i
, vcpu
, kvm
)
523 kvm_arm_resume_vcpu(vcpu
);
526 static void vcpu_sleep(struct kvm_vcpu
*vcpu
)
528 struct swait_queue_head
*wq
= kvm_arch_vcpu_wq(vcpu
);
530 swait_event_interruptible(*wq
, ((!vcpu
->arch
.power_off
) &&
531 (!vcpu
->arch
.pause
)));
534 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
536 return vcpu
->arch
.target
>= 0;
540 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
541 * @vcpu: The VCPU pointer
542 * @run: The kvm_run structure pointer used for userspace state exchange
544 * This function is called through the VCPU_RUN ioctl called from user space. It
545 * will execute VM code in a loop until the time slice for the process is used
546 * or some emulation is needed from user space in which case the function will
547 * return with return value 0 and with the kvm_run structure filled in with the
548 * required data for the requested emulation.
550 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
555 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
558 ret
= kvm_vcpu_first_run_init(vcpu
);
562 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
563 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
568 if (vcpu
->sigset_active
)
569 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
572 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
575 * Check conditions before entering the guest
579 update_vttbr(vcpu
->kvm
);
581 if (vcpu
->arch
.power_off
|| vcpu
->arch
.pause
)
585 * Preparing the interrupts to be injected also
586 * involves poking the GIC, which must be done in a
587 * non-preemptible context.
590 kvm_pmu_flush_hwstate(vcpu
);
591 kvm_timer_flush_hwstate(vcpu
);
592 kvm_vgic_flush_hwstate(vcpu
);
597 * Re-check atomic conditions
599 if (signal_pending(current
)) {
601 run
->exit_reason
= KVM_EXIT_INTR
;
604 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
) ||
605 vcpu
->arch
.power_off
|| vcpu
->arch
.pause
) {
607 kvm_pmu_sync_hwstate(vcpu
);
608 kvm_timer_sync_hwstate(vcpu
);
609 kvm_vgic_sync_hwstate(vcpu
);
614 kvm_arm_setup_debug(vcpu
);
616 /**************************************************************
619 trace_kvm_entry(*vcpu_pc(vcpu
));
620 guest_enter_irqoff();
621 vcpu
->mode
= IN_GUEST_MODE
;
623 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
625 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
629 *************************************************************/
631 kvm_arm_clear_debug(vcpu
);
634 * We may have taken a host interrupt in HYP mode (ie
635 * while executing the guest). This interrupt is still
636 * pending, as we haven't serviced it yet!
638 * We're now back in SVC mode, with interrupts
639 * disabled. Enabling the interrupts now will have
640 * the effect of taking the interrupt again, in SVC
646 * We do local_irq_enable() before calling guest_exit() so
647 * that if a timer interrupt hits while running the guest we
648 * account that tick as being spent in the guest. We enable
649 * preemption after calling guest_exit() so that if we get
650 * preempted we make sure ticks after that is not counted as
654 trace_kvm_exit(ret
, kvm_vcpu_trap_get_class(vcpu
), *vcpu_pc(vcpu
));
657 * We must sync the PMU and timer state before the vgic state so
658 * that the vgic can properly sample the updated state of the
661 kvm_pmu_sync_hwstate(vcpu
);
662 kvm_timer_sync_hwstate(vcpu
);
664 kvm_vgic_sync_hwstate(vcpu
);
668 ret
= handle_exit(vcpu
, run
, ret
);
671 if (vcpu
->sigset_active
)
672 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
676 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
682 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
683 bit_index
= __ffs(HCR_VI
);
684 else /* KVM_ARM_IRQ_CPU_FIQ */
685 bit_index
= __ffs(HCR_VF
);
687 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
689 set
= test_and_set_bit(bit_index
, ptr
);
691 set
= test_and_clear_bit(bit_index
, ptr
);
694 * If we didn't change anything, no need to wake up or kick other CPUs
700 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
701 * trigger a world-switch round on the running physical CPU to set the
702 * virtual IRQ/FIQ fields in the HCR appropriately.
709 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
712 u32 irq
= irq_level
->irq
;
713 unsigned int irq_type
, vcpu_idx
, irq_num
;
714 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
715 struct kvm_vcpu
*vcpu
= NULL
;
716 bool level
= irq_level
->level
;
718 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
719 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
720 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
722 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
725 case KVM_ARM_IRQ_TYPE_CPU
:
726 if (irqchip_in_kernel(kvm
))
729 if (vcpu_idx
>= nrcpus
)
732 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
736 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
739 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
740 case KVM_ARM_IRQ_TYPE_PPI
:
741 if (!irqchip_in_kernel(kvm
))
744 if (vcpu_idx
>= nrcpus
)
747 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
751 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
754 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
755 case KVM_ARM_IRQ_TYPE_SPI
:
756 if (!irqchip_in_kernel(kvm
))
759 if (irq_num
< VGIC_NR_PRIVATE_IRQS
)
762 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
768 static int kvm_vcpu_set_target(struct kvm_vcpu
*vcpu
,
769 const struct kvm_vcpu_init
*init
)
772 int phys_target
= kvm_target_cpu();
774 if (init
->target
!= phys_target
)
778 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
779 * use the same target.
781 if (vcpu
->arch
.target
!= -1 && vcpu
->arch
.target
!= init
->target
)
784 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
785 for (i
= 0; i
< sizeof(init
->features
) * 8; i
++) {
786 bool set
= (init
->features
[i
/ 32] & (1 << (i
% 32)));
788 if (set
&& i
>= KVM_VCPU_MAX_FEATURES
)
792 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
793 * use the same feature set.
795 if (vcpu
->arch
.target
!= -1 && i
< KVM_VCPU_MAX_FEATURES
&&
796 test_bit(i
, vcpu
->arch
.features
) != set
)
800 set_bit(i
, vcpu
->arch
.features
);
803 vcpu
->arch
.target
= phys_target
;
805 /* Now we know what it is, we can reset it. */
806 return kvm_reset_vcpu(vcpu
);
810 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
811 struct kvm_vcpu_init
*init
)
815 ret
= kvm_vcpu_set_target(vcpu
, init
);
820 * Ensure a rebooted VM will fault in RAM pages and detect if the
821 * guest MMU is turned off and flush the caches as needed.
823 if (vcpu
->arch
.has_run_once
)
824 stage2_unmap_vm(vcpu
->kvm
);
826 vcpu_reset_hcr(vcpu
);
829 * Handle the "start in power-off" case.
831 if (test_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
832 vcpu
->arch
.power_off
= true;
834 vcpu
->arch
.power_off
= false;
839 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu
*vcpu
,
840 struct kvm_device_attr
*attr
)
844 switch (attr
->group
) {
846 ret
= kvm_arm_vcpu_arch_set_attr(vcpu
, attr
);
853 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu
*vcpu
,
854 struct kvm_device_attr
*attr
)
858 switch (attr
->group
) {
860 ret
= kvm_arm_vcpu_arch_get_attr(vcpu
, attr
);
867 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu
*vcpu
,
868 struct kvm_device_attr
*attr
)
872 switch (attr
->group
) {
874 ret
= kvm_arm_vcpu_arch_has_attr(vcpu
, attr
);
881 long kvm_arch_vcpu_ioctl(struct file
*filp
,
882 unsigned int ioctl
, unsigned long arg
)
884 struct kvm_vcpu
*vcpu
= filp
->private_data
;
885 void __user
*argp
= (void __user
*)arg
;
886 struct kvm_device_attr attr
;
889 case KVM_ARM_VCPU_INIT
: {
890 struct kvm_vcpu_init init
;
892 if (copy_from_user(&init
, argp
, sizeof(init
)))
895 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
897 case KVM_SET_ONE_REG
:
898 case KVM_GET_ONE_REG
: {
899 struct kvm_one_reg reg
;
901 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
904 if (copy_from_user(®
, argp
, sizeof(reg
)))
906 if (ioctl
== KVM_SET_ONE_REG
)
907 return kvm_arm_set_reg(vcpu
, ®
);
909 return kvm_arm_get_reg(vcpu
, ®
);
911 case KVM_GET_REG_LIST
: {
912 struct kvm_reg_list __user
*user_list
= argp
;
913 struct kvm_reg_list reg_list
;
916 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
919 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
922 reg_list
.n
= kvm_arm_num_regs(vcpu
);
923 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
927 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
929 case KVM_SET_DEVICE_ATTR
: {
930 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
932 return kvm_arm_vcpu_set_attr(vcpu
, &attr
);
934 case KVM_GET_DEVICE_ATTR
: {
935 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
937 return kvm_arm_vcpu_get_attr(vcpu
, &attr
);
939 case KVM_HAS_DEVICE_ATTR
: {
940 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
942 return kvm_arm_vcpu_has_attr(vcpu
, &attr
);
950 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
952 * @log: slot id and address to which we copy the log
954 * Steps 1-4 below provide general overview of dirty page logging. See
955 * kvm_get_dirty_log_protect() function description for additional details.
957 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
958 * always flush the TLB (step 4) even if previous step failed and the dirty
959 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
960 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
961 * writes will be marked dirty for next log read.
963 * 1. Take a snapshot of the bit and clear it if needed.
964 * 2. Write protect the corresponding page.
965 * 3. Copy the snapshot to the userspace.
966 * 4. Flush TLB's if needed.
968 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
970 bool is_dirty
= false;
973 mutex_lock(&kvm
->slots_lock
);
975 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
978 kvm_flush_remote_tlbs(kvm
);
980 mutex_unlock(&kvm
->slots_lock
);
984 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
985 struct kvm_arm_device_addr
*dev_addr
)
987 unsigned long dev_id
, type
;
989 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
990 KVM_ARM_DEVICE_ID_SHIFT
;
991 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
992 KVM_ARM_DEVICE_TYPE_SHIFT
;
995 case KVM_ARM_DEVICE_VGIC_V2
:
998 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
1004 long kvm_arch_vm_ioctl(struct file
*filp
,
1005 unsigned int ioctl
, unsigned long arg
)
1007 struct kvm
*kvm
= filp
->private_data
;
1008 void __user
*argp
= (void __user
*)arg
;
1011 case KVM_CREATE_IRQCHIP
: {
1014 return kvm_vgic_create(kvm
, KVM_DEV_TYPE_ARM_VGIC_V2
);
1016 case KVM_ARM_SET_DEVICE_ADDR
: {
1017 struct kvm_arm_device_addr dev_addr
;
1019 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
1021 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
1023 case KVM_ARM_PREFERRED_TARGET
: {
1025 struct kvm_vcpu_init init
;
1027 err
= kvm_vcpu_preferred_target(&init
);
1031 if (copy_to_user(argp
, &init
, sizeof(init
)))
1041 static void cpu_init_hyp_mode(void *dummy
)
1043 phys_addr_t pgd_ptr
;
1044 unsigned long hyp_stack_ptr
;
1045 unsigned long stack_page
;
1046 unsigned long vector_ptr
;
1048 /* Switch from the HYP stub to our own HYP init vector */
1049 __hyp_set_vectors(kvm_get_idmap_vector());
1051 pgd_ptr
= kvm_mmu_get_httbr();
1052 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
1053 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
1054 vector_ptr
= (unsigned long)kvm_ksym_ref(__kvm_hyp_vector
);
1056 __cpu_init_hyp_mode(pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
1057 __cpu_init_stage2();
1059 kvm_arm_init_debug();
1062 static void cpu_hyp_reinit(void)
1064 if (is_kernel_in_hyp_mode()) {
1066 * __cpu_init_stage2() is safe to call even if the PM
1067 * event was cancelled before the CPU was reset.
1069 __cpu_init_stage2();
1071 if (__hyp_get_vectors() == hyp_default_vectors
)
1072 cpu_init_hyp_mode(NULL
);
1076 static void cpu_hyp_reset(void)
1078 if (!is_kernel_in_hyp_mode())
1079 __cpu_reset_hyp_mode(hyp_default_vectors
,
1080 kvm_get_idmap_start());
1083 static void _kvm_arch_hardware_enable(void *discard
)
1085 if (!__this_cpu_read(kvm_arm_hardware_enabled
)) {
1087 __this_cpu_write(kvm_arm_hardware_enabled
, 1);
1091 int kvm_arch_hardware_enable(void)
1093 _kvm_arch_hardware_enable(NULL
);
1097 static void _kvm_arch_hardware_disable(void *discard
)
1099 if (__this_cpu_read(kvm_arm_hardware_enabled
)) {
1101 __this_cpu_write(kvm_arm_hardware_enabled
, 0);
1105 void kvm_arch_hardware_disable(void)
1107 _kvm_arch_hardware_disable(NULL
);
1110 #ifdef CONFIG_CPU_PM
1111 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
1116 * kvm_arm_hardware_enabled is left with its old value over
1117 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1122 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1124 * don't update kvm_arm_hardware_enabled here
1125 * so that the hardware will be re-enabled
1126 * when we resume. See below.
1132 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1133 /* The hardware was enabled before suspend. */
1143 static struct notifier_block hyp_init_cpu_pm_nb
= {
1144 .notifier_call
= hyp_init_cpu_pm_notifier
,
1147 static void __init
hyp_cpu_pm_init(void)
1149 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
1151 static void __init
hyp_cpu_pm_exit(void)
1153 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb
);
1156 static inline void hyp_cpu_pm_init(void)
1159 static inline void hyp_cpu_pm_exit(void)
1164 static void teardown_common_resources(void)
1166 free_percpu(kvm_host_cpu_state
);
1169 static int init_common_resources(void)
1171 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
1172 if (!kvm_host_cpu_state
) {
1173 kvm_err("Cannot allocate host CPU state\n");
1180 static int init_subsystems(void)
1185 * Enable hardware so that subsystem initialisation can access EL2.
1187 on_each_cpu(_kvm_arch_hardware_enable
, NULL
, 1);
1190 * Register CPU lower-power notifier
1195 * Init HYP view of VGIC
1197 err
= kvm_vgic_hyp_init();
1200 vgic_present
= true;
1204 vgic_present
= false;
1212 * Init HYP architected timer support
1214 err
= kvm_timer_hyp_init();
1219 kvm_coproc_table_init();
1222 on_each_cpu(_kvm_arch_hardware_disable
, NULL
, 1);
1227 static void teardown_hyp_mode(void)
1231 if (is_kernel_in_hyp_mode())
1235 for_each_possible_cpu(cpu
)
1236 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
1240 static int init_vhe_mode(void)
1242 /* set size of VMID supported by CPU */
1243 kvm_vmid_bits
= kvm_get_vmid_bits();
1244 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1246 kvm_info("VHE mode initialized successfully\n");
1251 * Inits Hyp-mode on all online CPUs
1253 static int init_hyp_mode(void)
1259 * Allocate Hyp PGD and setup Hyp identity mapping
1261 err
= kvm_mmu_init();
1266 * It is probably enough to obtain the default on one
1267 * CPU. It's unlikely to be different on the others.
1269 hyp_default_vectors
= __hyp_get_vectors();
1272 * Allocate stack pages for Hypervisor-mode
1274 for_each_possible_cpu(cpu
) {
1275 unsigned long stack_page
;
1277 stack_page
= __get_free_page(GFP_KERNEL
);
1283 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
1287 * Map the Hyp-code called directly from the host
1289 err
= create_hyp_mappings(kvm_ksym_ref(__hyp_text_start
),
1290 kvm_ksym_ref(__hyp_text_end
), PAGE_HYP_EXEC
);
1292 kvm_err("Cannot map world-switch code\n");
1296 err
= create_hyp_mappings(kvm_ksym_ref(__start_rodata
),
1297 kvm_ksym_ref(__end_rodata
), PAGE_HYP_RO
);
1299 kvm_err("Cannot map rodata section\n");
1304 * Map the Hyp stack pages
1306 for_each_possible_cpu(cpu
) {
1307 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
1308 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
,
1312 kvm_err("Cannot map hyp stack\n");
1317 for_each_possible_cpu(cpu
) {
1318 kvm_cpu_context_t
*cpu_ctxt
;
1320 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
1321 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1, PAGE_HYP
);
1324 kvm_err("Cannot map host CPU state: %d\n", err
);
1329 /* set size of VMID supported by CPU */
1330 kvm_vmid_bits
= kvm_get_vmid_bits();
1331 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1333 kvm_info("Hyp mode initialized successfully\n");
1338 teardown_hyp_mode();
1339 kvm_err("error initializing Hyp mode: %d\n", err
);
1343 static void check_kvm_target_cpu(void *ret
)
1345 *(int *)ret
= kvm_target_cpu();
1348 struct kvm_vcpu
*kvm_mpidr_to_vcpu(struct kvm
*kvm
, unsigned long mpidr
)
1350 struct kvm_vcpu
*vcpu
;
1353 mpidr
&= MPIDR_HWID_BITMASK
;
1354 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1355 if (mpidr
== kvm_vcpu_get_mpidr_aff(vcpu
))
1362 * Initialize Hyp-mode and memory mappings on all CPUs.
1364 int kvm_arch_init(void *opaque
)
1369 if (!is_hyp_mode_available()) {
1370 kvm_err("HYP mode not available\n");
1374 for_each_online_cpu(cpu
) {
1375 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1377 kvm_err("Error, CPU %d not supported!\n", cpu
);
1382 err
= init_common_resources();
1386 if (is_kernel_in_hyp_mode())
1387 err
= init_vhe_mode();
1389 err
= init_hyp_mode();
1393 err
= init_subsystems();
1400 teardown_hyp_mode();
1402 teardown_common_resources();
1406 /* NOP: Compiling as a module not supported */
1407 void kvm_arch_exit(void)
1409 kvm_perf_teardown();
1412 static int arm_init(void)
1414 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1418 module_init(arm_init
);