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/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>
30 #include <kvm/arm_pmu.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 DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled
);
70 static void kvm_arm_set_running_vcpu(struct kvm_vcpu
*vcpu
)
72 BUG_ON(preemptible());
73 __this_cpu_write(kvm_arm_running_vcpu
, vcpu
);
77 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
78 * Must be called from non-preemptible context
80 struct kvm_vcpu
*kvm_arm_get_running_vcpu(void)
82 BUG_ON(preemptible());
83 return __this_cpu_read(kvm_arm_running_vcpu
);
87 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
89 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
91 return &kvm_arm_running_vcpu
;
94 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
96 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
99 int kvm_arch_hardware_setup(void)
104 void kvm_arch_check_processor_compat(void *rtn
)
111 * kvm_arch_init_vm - initializes a VM data structure
112 * @kvm: pointer to the KVM struct
114 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
121 ret
= kvm_alloc_stage2_pgd(kvm
);
125 ret
= create_hyp_mappings(kvm
, kvm
+ 1);
127 goto out_free_stage2_pgd
;
129 kvm_vgic_early_init(kvm
);
132 /* Mark the initial VMID generation invalid */
133 kvm
->arch
.vmid_gen
= 0;
135 /* The maximum number of VCPUs is limited by the host's GIC model */
136 kvm
->arch
.max_vcpus
= vgic_present
?
137 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS
;
141 kvm_free_stage2_pgd(kvm
);
146 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
148 return VM_FAULT_SIGBUS
;
153 * kvm_arch_destroy_vm - destroy the VM data structure
154 * @kvm: pointer to the KVM struct
156 void kvm_arch_destroy_vm(struct kvm
*kvm
)
160 kvm_free_stage2_pgd(kvm
);
162 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
164 kvm_arch_vcpu_free(kvm
->vcpus
[i
]);
165 kvm
->vcpus
[i
] = NULL
;
169 kvm_vgic_destroy(kvm
);
172 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
176 case KVM_CAP_IRQCHIP
:
179 case KVM_CAP_IOEVENTFD
:
180 case KVM_CAP_DEVICE_CTRL
:
181 case KVM_CAP_USER_MEMORY
:
182 case KVM_CAP_SYNC_MMU
:
183 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
184 case KVM_CAP_ONE_REG
:
185 case KVM_CAP_ARM_PSCI
:
186 case KVM_CAP_ARM_PSCI_0_2
:
187 case KVM_CAP_READONLY_MEM
:
188 case KVM_CAP_MP_STATE
:
191 case KVM_CAP_COALESCED_MMIO
:
192 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
194 case KVM_CAP_ARM_SET_DEVICE_ADDR
:
197 case KVM_CAP_NR_VCPUS
:
198 r
= num_online_cpus();
200 case KVM_CAP_MAX_VCPUS
:
204 r
= kvm_arch_dev_ioctl_check_extension(ext
);
210 long kvm_arch_dev_ioctl(struct file
*filp
,
211 unsigned int ioctl
, unsigned long arg
)
217 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
, unsigned int id
)
220 struct kvm_vcpu
*vcpu
;
222 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
)) {
227 if (id
>= kvm
->arch
.max_vcpus
) {
232 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
238 err
= kvm_vcpu_init(vcpu
, kvm
, id
);
242 err
= create_hyp_mappings(vcpu
, vcpu
+ 1);
248 kvm_vcpu_uninit(vcpu
);
250 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
255 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
257 kvm_vgic_vcpu_early_init(vcpu
);
260 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
262 kvm_mmu_free_memory_caches(vcpu
);
263 kvm_timer_vcpu_terminate(vcpu
);
264 kvm_vgic_vcpu_destroy(vcpu
);
265 kvm_pmu_vcpu_destroy(vcpu
);
266 kvm_vcpu_uninit(vcpu
);
267 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
270 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
272 kvm_arch_vcpu_free(vcpu
);
275 int kvm_cpu_has_pending_timer(struct kvm_vcpu
*vcpu
)
277 return kvm_timer_should_fire(vcpu
);
280 void kvm_arch_vcpu_blocking(struct kvm_vcpu
*vcpu
)
282 kvm_timer_schedule(vcpu
);
285 void kvm_arch_vcpu_unblocking(struct kvm_vcpu
*vcpu
)
287 kvm_timer_unschedule(vcpu
);
290 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
292 /* Force users to call KVM_ARM_VCPU_INIT */
293 vcpu
->arch
.target
= -1;
294 bitmap_zero(vcpu
->arch
.features
, KVM_VCPU_MAX_FEATURES
);
296 /* Set up the timer */
297 kvm_timer_vcpu_init(vcpu
);
299 kvm_arm_reset_debug_ptr(vcpu
);
304 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
307 vcpu
->arch
.host_cpu_context
= this_cpu_ptr(kvm_host_cpu_state
);
309 kvm_arm_set_running_vcpu(vcpu
);
312 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
315 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
316 * if the vcpu is no longer assigned to a cpu. This is used for the
317 * optimized make_all_cpus_request path.
321 kvm_arm_set_running_vcpu(NULL
);
322 kvm_timer_vcpu_put(vcpu
);
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
)
374 smp_call_function_many(mask
, exit_vm_noop
, NULL
, true);
379 * need_new_vmid_gen - check that the VMID is still valid
380 * @kvm: The VM's VMID to checkt
382 * return true if there is a new generation of VMIDs being used
384 * The hardware supports only 256 values with the value zero reserved for the
385 * host, so we check if an assigned value belongs to a previous generation,
386 * which which requires us to assign a new value. If we're the first to use a
387 * VMID for the new generation, we must flush necessary caches and TLBs on all
390 static bool need_new_vmid_gen(struct kvm
*kvm
)
392 return unlikely(kvm
->arch
.vmid_gen
!= atomic64_read(&kvm_vmid_gen
));
396 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
397 * @kvm The guest that we are about to run
399 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
400 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
403 static void update_vttbr(struct kvm
*kvm
)
405 phys_addr_t pgd_phys
;
408 if (!need_new_vmid_gen(kvm
))
411 spin_lock(&kvm_vmid_lock
);
414 * We need to re-check the vmid_gen here to ensure that if another vcpu
415 * already allocated a valid vmid for this vm, then this vcpu should
418 if (!need_new_vmid_gen(kvm
)) {
419 spin_unlock(&kvm_vmid_lock
);
423 /* First user of a new VMID generation? */
424 if (unlikely(kvm_next_vmid
== 0)) {
425 atomic64_inc(&kvm_vmid_gen
);
429 * On SMP we know no other CPUs can use this CPU's or each
430 * other's VMID after force_vm_exit returns since the
431 * kvm_vmid_lock blocks them from reentry to the guest.
433 force_vm_exit(cpu_all_mask
);
435 * Now broadcast TLB + ICACHE invalidation over the inner
436 * shareable domain to make sure all data structures are
439 kvm_call_hyp(__kvm_flush_vm_context
);
442 kvm
->arch
.vmid_gen
= atomic64_read(&kvm_vmid_gen
);
443 kvm
->arch
.vmid
= kvm_next_vmid
;
445 kvm_next_vmid
&= (1 << kvm_vmid_bits
) - 1;
447 /* update vttbr to be used with the new vmid */
448 pgd_phys
= virt_to_phys(kvm
->arch
.pgd
);
449 BUG_ON(pgd_phys
& ~VTTBR_BADDR_MASK
);
450 vmid
= ((u64
)(kvm
->arch
.vmid
) << VTTBR_VMID_SHIFT
) & VTTBR_VMID_MASK(kvm_vmid_bits
);
451 kvm
->arch
.vttbr
= pgd_phys
| vmid
;
453 spin_unlock(&kvm_vmid_lock
);
456 static int kvm_vcpu_first_run_init(struct kvm_vcpu
*vcpu
)
458 struct kvm
*kvm
= vcpu
->kvm
;
461 if (likely(vcpu
->arch
.has_run_once
))
464 vcpu
->arch
.has_run_once
= true;
467 * Map the VGIC hardware resources before running a vcpu the first
470 if (unlikely(irqchip_in_kernel(kvm
) && !vgic_ready(kvm
))) {
471 ret
= kvm_vgic_map_resources(kvm
);
477 * Enable the arch timers only if we have an in-kernel VGIC
478 * and it has been properly initialized, since we cannot handle
479 * interrupts from the virtual timer with a userspace gic.
481 if (irqchip_in_kernel(kvm
) && vgic_initialized(kvm
))
482 ret
= kvm_timer_enable(vcpu
);
487 bool kvm_arch_intc_initialized(struct kvm
*kvm
)
489 return vgic_initialized(kvm
);
492 void kvm_arm_halt_guest(struct kvm
*kvm
)
495 struct kvm_vcpu
*vcpu
;
497 kvm_for_each_vcpu(i
, vcpu
, kvm
)
498 vcpu
->arch
.pause
= true;
499 kvm_make_all_cpus_request(kvm
, KVM_REQ_VCPU_EXIT
);
502 void kvm_arm_halt_vcpu(struct kvm_vcpu
*vcpu
)
504 vcpu
->arch
.pause
= true;
508 void kvm_arm_resume_vcpu(struct kvm_vcpu
*vcpu
)
510 struct swait_queue_head
*wq
= kvm_arch_vcpu_wq(vcpu
);
512 vcpu
->arch
.pause
= false;
516 void kvm_arm_resume_guest(struct kvm
*kvm
)
519 struct kvm_vcpu
*vcpu
;
521 kvm_for_each_vcpu(i
, vcpu
, kvm
)
522 kvm_arm_resume_vcpu(vcpu
);
525 static void vcpu_sleep(struct kvm_vcpu
*vcpu
)
527 struct swait_queue_head
*wq
= kvm_arch_vcpu_wq(vcpu
);
529 swait_event_interruptible(*wq
, ((!vcpu
->arch
.power_off
) &&
530 (!vcpu
->arch
.pause
)));
533 static int kvm_vcpu_initialized(struct kvm_vcpu
*vcpu
)
535 return vcpu
->arch
.target
>= 0;
539 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
540 * @vcpu: The VCPU pointer
541 * @run: The kvm_run structure pointer used for userspace state exchange
543 * This function is called through the VCPU_RUN ioctl called from user space. It
544 * will execute VM code in a loop until the time slice for the process is used
545 * or some emulation is needed from user space in which case the function will
546 * return with return value 0 and with the kvm_run structure filled in with the
547 * required data for the requested emulation.
549 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
554 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
557 ret
= kvm_vcpu_first_run_init(vcpu
);
561 if (run
->exit_reason
== KVM_EXIT_MMIO
) {
562 ret
= kvm_handle_mmio_return(vcpu
, vcpu
->run
);
567 if (vcpu
->sigset_active
)
568 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
571 run
->exit_reason
= KVM_EXIT_UNKNOWN
;
574 * Check conditions before entering the guest
578 update_vttbr(vcpu
->kvm
);
580 if (vcpu
->arch
.power_off
|| vcpu
->arch
.pause
)
584 * Preparing the interrupts to be injected also
585 * involves poking the GIC, which must be done in a
586 * non-preemptible context.
589 kvm_pmu_flush_hwstate(vcpu
);
590 kvm_timer_flush_hwstate(vcpu
);
591 kvm_vgic_flush_hwstate(vcpu
);
596 * Re-check atomic conditions
598 if (signal_pending(current
)) {
600 run
->exit_reason
= KVM_EXIT_INTR
;
603 if (ret
<= 0 || need_new_vmid_gen(vcpu
->kvm
) ||
604 vcpu
->arch
.power_off
|| vcpu
->arch
.pause
) {
606 kvm_pmu_sync_hwstate(vcpu
);
607 kvm_timer_sync_hwstate(vcpu
);
608 kvm_vgic_sync_hwstate(vcpu
);
613 kvm_arm_setup_debug(vcpu
);
615 /**************************************************************
618 trace_kvm_entry(*vcpu_pc(vcpu
));
620 vcpu
->mode
= IN_GUEST_MODE
;
622 ret
= kvm_call_hyp(__kvm_vcpu_run
, vcpu
);
624 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
628 *************************************************************/
630 kvm_arm_clear_debug(vcpu
);
633 * We may have taken a host interrupt in HYP mode (ie
634 * while executing the guest). This interrupt is still
635 * pending, as we haven't serviced it yet!
637 * We're now back in SVC mode, with interrupts
638 * disabled. Enabling the interrupts now will have
639 * the effect of taking the interrupt again, in SVC
645 * We do local_irq_enable() before calling kvm_guest_exit() so
646 * that if a timer interrupt hits while running the guest we
647 * account that tick as being spent in the guest. We enable
648 * preemption after calling kvm_guest_exit() so that if we get
649 * preempted we make sure ticks after that is not counted as
653 trace_kvm_exit(ret
, kvm_vcpu_trap_get_class(vcpu
), *vcpu_pc(vcpu
));
656 * We must sync the PMU and timer state before the vgic state so
657 * that the vgic can properly sample the updated state of the
660 kvm_pmu_sync_hwstate(vcpu
);
661 kvm_timer_sync_hwstate(vcpu
);
663 kvm_vgic_sync_hwstate(vcpu
);
667 ret
= handle_exit(vcpu
, run
, ret
);
670 if (vcpu
->sigset_active
)
671 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
675 static int vcpu_interrupt_line(struct kvm_vcpu
*vcpu
, int number
, bool level
)
681 if (number
== KVM_ARM_IRQ_CPU_IRQ
)
682 bit_index
= __ffs(HCR_VI
);
683 else /* KVM_ARM_IRQ_CPU_FIQ */
684 bit_index
= __ffs(HCR_VF
);
686 ptr
= (unsigned long *)&vcpu
->arch
.irq_lines
;
688 set
= test_and_set_bit(bit_index
, ptr
);
690 set
= test_and_clear_bit(bit_index
, ptr
);
693 * If we didn't change anything, no need to wake up or kick other CPUs
699 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
700 * trigger a world-switch round on the running physical CPU to set the
701 * virtual IRQ/FIQ fields in the HCR appropriately.
708 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_level
,
711 u32 irq
= irq_level
->irq
;
712 unsigned int irq_type
, vcpu_idx
, irq_num
;
713 int nrcpus
= atomic_read(&kvm
->online_vcpus
);
714 struct kvm_vcpu
*vcpu
= NULL
;
715 bool level
= irq_level
->level
;
717 irq_type
= (irq
>> KVM_ARM_IRQ_TYPE_SHIFT
) & KVM_ARM_IRQ_TYPE_MASK
;
718 vcpu_idx
= (irq
>> KVM_ARM_IRQ_VCPU_SHIFT
) & KVM_ARM_IRQ_VCPU_MASK
;
719 irq_num
= (irq
>> KVM_ARM_IRQ_NUM_SHIFT
) & KVM_ARM_IRQ_NUM_MASK
;
721 trace_kvm_irq_line(irq_type
, vcpu_idx
, irq_num
, irq_level
->level
);
724 case KVM_ARM_IRQ_TYPE_CPU
:
725 if (irqchip_in_kernel(kvm
))
728 if (vcpu_idx
>= nrcpus
)
731 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
735 if (irq_num
> KVM_ARM_IRQ_CPU_FIQ
)
738 return vcpu_interrupt_line(vcpu
, irq_num
, level
);
739 case KVM_ARM_IRQ_TYPE_PPI
:
740 if (!irqchip_in_kernel(kvm
))
743 if (vcpu_idx
>= nrcpus
)
746 vcpu
= kvm_get_vcpu(kvm
, vcpu_idx
);
750 if (irq_num
< VGIC_NR_SGIS
|| irq_num
>= VGIC_NR_PRIVATE_IRQS
)
753 return kvm_vgic_inject_irq(kvm
, vcpu
->vcpu_id
, irq_num
, level
);
754 case KVM_ARM_IRQ_TYPE_SPI
:
755 if (!irqchip_in_kernel(kvm
))
758 if (irq_num
< VGIC_NR_PRIVATE_IRQS
)
761 return kvm_vgic_inject_irq(kvm
, 0, irq_num
, level
);
767 static int kvm_vcpu_set_target(struct kvm_vcpu
*vcpu
,
768 const struct kvm_vcpu_init
*init
)
771 int phys_target
= kvm_target_cpu();
773 if (init
->target
!= phys_target
)
777 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
778 * use the same target.
780 if (vcpu
->arch
.target
!= -1 && vcpu
->arch
.target
!= init
->target
)
783 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
784 for (i
= 0; i
< sizeof(init
->features
) * 8; i
++) {
785 bool set
= (init
->features
[i
/ 32] & (1 << (i
% 32)));
787 if (set
&& i
>= KVM_VCPU_MAX_FEATURES
)
791 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
792 * use the same feature set.
794 if (vcpu
->arch
.target
!= -1 && i
< KVM_VCPU_MAX_FEATURES
&&
795 test_bit(i
, vcpu
->arch
.features
) != set
)
799 set_bit(i
, vcpu
->arch
.features
);
802 vcpu
->arch
.target
= phys_target
;
804 /* Now we know what it is, we can reset it. */
805 return kvm_reset_vcpu(vcpu
);
809 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu
*vcpu
,
810 struct kvm_vcpu_init
*init
)
814 ret
= kvm_vcpu_set_target(vcpu
, init
);
819 * Ensure a rebooted VM will fault in RAM pages and detect if the
820 * guest MMU is turned off and flush the caches as needed.
822 if (vcpu
->arch
.has_run_once
)
823 stage2_unmap_vm(vcpu
->kvm
);
825 vcpu_reset_hcr(vcpu
);
828 * Handle the "start in power-off" case.
830 if (test_bit(KVM_ARM_VCPU_POWER_OFF
, vcpu
->arch
.features
))
831 vcpu
->arch
.power_off
= true;
833 vcpu
->arch
.power_off
= false;
838 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu
*vcpu
,
839 struct kvm_device_attr
*attr
)
843 switch (attr
->group
) {
845 ret
= kvm_arm_vcpu_arch_set_attr(vcpu
, attr
);
852 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu
*vcpu
,
853 struct kvm_device_attr
*attr
)
857 switch (attr
->group
) {
859 ret
= kvm_arm_vcpu_arch_get_attr(vcpu
, attr
);
866 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu
*vcpu
,
867 struct kvm_device_attr
*attr
)
871 switch (attr
->group
) {
873 ret
= kvm_arm_vcpu_arch_has_attr(vcpu
, attr
);
880 long kvm_arch_vcpu_ioctl(struct file
*filp
,
881 unsigned int ioctl
, unsigned long arg
)
883 struct kvm_vcpu
*vcpu
= filp
->private_data
;
884 void __user
*argp
= (void __user
*)arg
;
885 struct kvm_device_attr attr
;
888 case KVM_ARM_VCPU_INIT
: {
889 struct kvm_vcpu_init init
;
891 if (copy_from_user(&init
, argp
, sizeof(init
)))
894 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu
, &init
);
896 case KVM_SET_ONE_REG
:
897 case KVM_GET_ONE_REG
: {
898 struct kvm_one_reg reg
;
900 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
903 if (copy_from_user(®
, argp
, sizeof(reg
)))
905 if (ioctl
== KVM_SET_ONE_REG
)
906 return kvm_arm_set_reg(vcpu
, ®
);
908 return kvm_arm_get_reg(vcpu
, ®
);
910 case KVM_GET_REG_LIST
: {
911 struct kvm_reg_list __user
*user_list
= argp
;
912 struct kvm_reg_list reg_list
;
915 if (unlikely(!kvm_vcpu_initialized(vcpu
)))
918 if (copy_from_user(®_list
, user_list
, sizeof(reg_list
)))
921 reg_list
.n
= kvm_arm_num_regs(vcpu
);
922 if (copy_to_user(user_list
, ®_list
, sizeof(reg_list
)))
926 return kvm_arm_copy_reg_indices(vcpu
, user_list
->reg
);
928 case KVM_SET_DEVICE_ATTR
: {
929 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
931 return kvm_arm_vcpu_set_attr(vcpu
, &attr
);
933 case KVM_GET_DEVICE_ATTR
: {
934 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
936 return kvm_arm_vcpu_get_attr(vcpu
, &attr
);
938 case KVM_HAS_DEVICE_ATTR
: {
939 if (copy_from_user(&attr
, argp
, sizeof(attr
)))
941 return kvm_arm_vcpu_has_attr(vcpu
, &attr
);
949 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
951 * @log: slot id and address to which we copy the log
953 * Steps 1-4 below provide general overview of dirty page logging. See
954 * kvm_get_dirty_log_protect() function description for additional details.
956 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
957 * always flush the TLB (step 4) even if previous step failed and the dirty
958 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
959 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
960 * writes will be marked dirty for next log read.
962 * 1. Take a snapshot of the bit and clear it if needed.
963 * 2. Write protect the corresponding page.
964 * 3. Copy the snapshot to the userspace.
965 * 4. Flush TLB's if needed.
967 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
969 bool is_dirty
= false;
972 mutex_lock(&kvm
->slots_lock
);
974 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
977 kvm_flush_remote_tlbs(kvm
);
979 mutex_unlock(&kvm
->slots_lock
);
983 static int kvm_vm_ioctl_set_device_addr(struct kvm
*kvm
,
984 struct kvm_arm_device_addr
*dev_addr
)
986 unsigned long dev_id
, type
;
988 dev_id
= (dev_addr
->id
& KVM_ARM_DEVICE_ID_MASK
) >>
989 KVM_ARM_DEVICE_ID_SHIFT
;
990 type
= (dev_addr
->id
& KVM_ARM_DEVICE_TYPE_MASK
) >>
991 KVM_ARM_DEVICE_TYPE_SHIFT
;
994 case KVM_ARM_DEVICE_VGIC_V2
:
997 return kvm_vgic_addr(kvm
, type
, &dev_addr
->addr
, true);
1003 long kvm_arch_vm_ioctl(struct file
*filp
,
1004 unsigned int ioctl
, unsigned long arg
)
1006 struct kvm
*kvm
= filp
->private_data
;
1007 void __user
*argp
= (void __user
*)arg
;
1010 case KVM_CREATE_IRQCHIP
: {
1013 return kvm_vgic_create(kvm
, KVM_DEV_TYPE_ARM_VGIC_V2
);
1015 case KVM_ARM_SET_DEVICE_ADDR
: {
1016 struct kvm_arm_device_addr dev_addr
;
1018 if (copy_from_user(&dev_addr
, argp
, sizeof(dev_addr
)))
1020 return kvm_vm_ioctl_set_device_addr(kvm
, &dev_addr
);
1022 case KVM_ARM_PREFERRED_TARGET
: {
1024 struct kvm_vcpu_init init
;
1026 err
= kvm_vcpu_preferred_target(&init
);
1030 if (copy_to_user(argp
, &init
, sizeof(init
)))
1040 static void cpu_init_hyp_mode(void *dummy
)
1042 phys_addr_t boot_pgd_ptr
;
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 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
1052 pgd_ptr
= kvm_mmu_get_httbr();
1053 stack_page
= __this_cpu_read(kvm_arm_hyp_stack_page
);
1054 hyp_stack_ptr
= stack_page
+ PAGE_SIZE
;
1055 vector_ptr
= (unsigned long)kvm_ksym_ref(__kvm_hyp_vector
);
1057 __cpu_init_hyp_mode(boot_pgd_ptr
, pgd_ptr
, hyp_stack_ptr
, vector_ptr
);
1058 __cpu_init_stage2();
1060 kvm_arm_init_debug();
1063 static void cpu_hyp_reinit(void)
1065 if (is_kernel_in_hyp_mode()) {
1067 * __cpu_init_stage2() is safe to call even if the PM
1068 * event was cancelled before the CPU was reset.
1070 __cpu_init_stage2();
1072 if (__hyp_get_vectors() == hyp_default_vectors
)
1073 cpu_init_hyp_mode(NULL
);
1077 static void cpu_hyp_reset(void)
1079 phys_addr_t boot_pgd_ptr
;
1080 phys_addr_t phys_idmap_start
;
1082 if (!is_kernel_in_hyp_mode()) {
1083 boot_pgd_ptr
= kvm_mmu_get_boot_httbr();
1084 phys_idmap_start
= kvm_get_idmap_start();
1086 __cpu_reset_hyp_mode(boot_pgd_ptr
, phys_idmap_start
);
1090 static void _kvm_arch_hardware_enable(void *discard
)
1092 if (!__this_cpu_read(kvm_arm_hardware_enabled
)) {
1094 __this_cpu_write(kvm_arm_hardware_enabled
, 1);
1098 int kvm_arch_hardware_enable(void)
1100 _kvm_arch_hardware_enable(NULL
);
1104 static void _kvm_arch_hardware_disable(void *discard
)
1106 if (__this_cpu_read(kvm_arm_hardware_enabled
)) {
1108 __this_cpu_write(kvm_arm_hardware_enabled
, 0);
1112 void kvm_arch_hardware_disable(void)
1114 _kvm_arch_hardware_disable(NULL
);
1117 #ifdef CONFIG_CPU_PM
1118 static int hyp_init_cpu_pm_notifier(struct notifier_block
*self
,
1123 * kvm_arm_hardware_enabled is left with its old value over
1124 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1129 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1131 * don't update kvm_arm_hardware_enabled here
1132 * so that the hardware will be re-enabled
1133 * when we resume. See below.
1139 if (__this_cpu_read(kvm_arm_hardware_enabled
))
1140 /* The hardware was enabled before suspend. */
1150 static struct notifier_block hyp_init_cpu_pm_nb
= {
1151 .notifier_call
= hyp_init_cpu_pm_notifier
,
1154 static void __init
hyp_cpu_pm_init(void)
1156 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb
);
1158 static void __init
hyp_cpu_pm_exit(void)
1160 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb
);
1163 static inline void hyp_cpu_pm_init(void)
1166 static inline void hyp_cpu_pm_exit(void)
1171 static void teardown_common_resources(void)
1173 free_percpu(kvm_host_cpu_state
);
1176 static int init_common_resources(void)
1178 kvm_host_cpu_state
= alloc_percpu(kvm_cpu_context_t
);
1179 if (!kvm_host_cpu_state
) {
1180 kvm_err("Cannot allocate host CPU state\n");
1187 static int init_subsystems(void)
1192 * Enable hardware so that subsystem initialisation can access EL2.
1194 on_each_cpu(_kvm_arch_hardware_enable
, NULL
, 1);
1197 * Register CPU lower-power notifier
1202 * Init HYP view of VGIC
1204 err
= kvm_vgic_hyp_init();
1207 vgic_present
= true;
1211 vgic_present
= false;
1219 * Init HYP architected timer support
1221 err
= kvm_timer_hyp_init();
1226 kvm_coproc_table_init();
1229 on_each_cpu(_kvm_arch_hardware_disable
, NULL
, 1);
1234 static void teardown_hyp_mode(void)
1238 if (is_kernel_in_hyp_mode())
1242 for_each_possible_cpu(cpu
)
1243 free_page(per_cpu(kvm_arm_hyp_stack_page
, cpu
));
1247 static int init_vhe_mode(void)
1249 /* set size of VMID supported by CPU */
1250 kvm_vmid_bits
= kvm_get_vmid_bits();
1251 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1253 kvm_info("VHE mode initialized successfully\n");
1258 * Inits Hyp-mode on all online CPUs
1260 static int init_hyp_mode(void)
1266 * Allocate Hyp PGD and setup Hyp identity mapping
1268 err
= kvm_mmu_init();
1273 * It is probably enough to obtain the default on one
1274 * CPU. It's unlikely to be different on the others.
1276 hyp_default_vectors
= __hyp_get_vectors();
1279 * Allocate stack pages for Hypervisor-mode
1281 for_each_possible_cpu(cpu
) {
1282 unsigned long stack_page
;
1284 stack_page
= __get_free_page(GFP_KERNEL
);
1290 per_cpu(kvm_arm_hyp_stack_page
, cpu
) = stack_page
;
1294 * Map the Hyp-code called directly from the host
1296 err
= create_hyp_mappings(kvm_ksym_ref(__hyp_text_start
),
1297 kvm_ksym_ref(__hyp_text_end
));
1299 kvm_err("Cannot map world-switch code\n");
1303 err
= create_hyp_mappings(kvm_ksym_ref(__start_rodata
),
1304 kvm_ksym_ref(__end_rodata
));
1306 kvm_err("Cannot map rodata section\n");
1311 * Map the Hyp stack pages
1313 for_each_possible_cpu(cpu
) {
1314 char *stack_page
= (char *)per_cpu(kvm_arm_hyp_stack_page
, cpu
);
1315 err
= create_hyp_mappings(stack_page
, stack_page
+ PAGE_SIZE
);
1318 kvm_err("Cannot map hyp stack\n");
1323 for_each_possible_cpu(cpu
) {
1324 kvm_cpu_context_t
*cpu_ctxt
;
1326 cpu_ctxt
= per_cpu_ptr(kvm_host_cpu_state
, cpu
);
1327 err
= create_hyp_mappings(cpu_ctxt
, cpu_ctxt
+ 1);
1330 kvm_err("Cannot map host CPU state: %d\n", err
);
1335 #ifndef CONFIG_HOTPLUG_CPU
1336 free_boot_hyp_pgd();
1339 /* set size of VMID supported by CPU */
1340 kvm_vmid_bits
= kvm_get_vmid_bits();
1341 kvm_info("%d-bit VMID\n", kvm_vmid_bits
);
1343 kvm_info("Hyp mode initialized successfully\n");
1348 teardown_hyp_mode();
1349 kvm_err("error initializing Hyp mode: %d\n", err
);
1353 static void check_kvm_target_cpu(void *ret
)
1355 *(int *)ret
= kvm_target_cpu();
1358 struct kvm_vcpu
*kvm_mpidr_to_vcpu(struct kvm
*kvm
, unsigned long mpidr
)
1360 struct kvm_vcpu
*vcpu
;
1363 mpidr
&= MPIDR_HWID_BITMASK
;
1364 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1365 if (mpidr
== kvm_vcpu_get_mpidr_aff(vcpu
))
1372 * Initialize Hyp-mode and memory mappings on all CPUs.
1374 int kvm_arch_init(void *opaque
)
1379 if (!is_hyp_mode_available()) {
1380 kvm_err("HYP mode not available\n");
1384 for_each_online_cpu(cpu
) {
1385 smp_call_function_single(cpu
, check_kvm_target_cpu
, &ret
, 1);
1387 kvm_err("Error, CPU %d not supported!\n", cpu
);
1392 err
= init_common_resources();
1396 if (is_kernel_in_hyp_mode())
1397 err
= init_vhe_mode();
1399 err
= init_hyp_mode();
1403 err
= init_subsystems();
1410 teardown_hyp_mode();
1412 teardown_common_resources();
1416 /* NOP: Compiling as a module not supported */
1417 void kvm_arch_exit(void)
1419 kvm_perf_teardown();
1422 static int arm_init(void)
1424 int rc
= kvm_init(NULL
, sizeof(struct kvm_vcpu
), 0, THIS_MODULE
);
1428 module_init(arm_init
);