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 bool kvm_arch_has_vcpu_debugfs(void)
152 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
157 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
159 return VM_FAULT_SIGBUS;
164 * kvm_arch_destroy_vm - destroy the VM data structure
165 * @kvm: pointer to the KVM struct
167 void kvm_arch_destroy_vm(struct kvm *kvm)
171 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
173 kvm_arch_vcpu_free(kvm->vcpus[i]);
174 kvm->vcpus[i] = NULL;
178 kvm_vgic_destroy(kvm);
181 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
185 case KVM_CAP_IRQCHIP:
188 case KVM_CAP_IOEVENTFD:
189 case KVM_CAP_DEVICE_CTRL:
190 case KVM_CAP_USER_MEMORY:
191 case KVM_CAP_SYNC_MMU:
192 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
193 case KVM_CAP_ONE_REG:
194 case KVM_CAP_ARM_PSCI:
195 case KVM_CAP_ARM_PSCI_0_2:
196 case KVM_CAP_READONLY_MEM:
197 case KVM_CAP_MP_STATE:
200 case KVM_CAP_COALESCED_MMIO:
201 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
203 case KVM_CAP_ARM_SET_DEVICE_ADDR:
206 case KVM_CAP_NR_VCPUS:
207 r = num_online_cpus();
209 case KVM_CAP_MAX_VCPUS:
213 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
219 long kvm_arch_dev_ioctl(struct file *filp,
220 unsigned int ioctl, unsigned long arg)
226 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
229 struct kvm_vcpu *vcpu;
231 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
236 if (id >= kvm->arch.max_vcpus) {
241 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
247 err = kvm_vcpu_init(vcpu, kvm, id);
251 err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
257 kvm_vcpu_uninit(vcpu);
259 kmem_cache_free(kvm_vcpu_cache, vcpu);
264 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
266 kvm_vgic_vcpu_early_init(vcpu);
269 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
271 kvm_mmu_free_memory_caches(vcpu);
272 kvm_timer_vcpu_terminate(vcpu);
273 kvm_vgic_vcpu_destroy(vcpu);
274 kvm_pmu_vcpu_destroy(vcpu);
275 kvm_vcpu_uninit(vcpu);
276 kmem_cache_free(kvm_vcpu_cache, vcpu);
279 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
281 kvm_arch_vcpu_free(vcpu);
284 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
286 return kvm_timer_should_fire(vcpu);
289 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
291 kvm_timer_schedule(vcpu);
294 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
296 kvm_timer_unschedule(vcpu);
299 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
301 /* Force users to call KVM_ARM_VCPU_INIT */
302 vcpu->arch.target = -1;
303 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
305 /* Set up the timer */
306 kvm_timer_vcpu_init(vcpu);
308 kvm_arm_reset_debug_ptr(vcpu);
313 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
316 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
318 kvm_arm_set_running_vcpu(vcpu);
321 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
324 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
325 * if the vcpu is no longer assigned to a cpu. This is used for the
326 * optimized make_all_cpus_request path.
330 kvm_arm_set_running_vcpu(NULL);
331 kvm_timer_vcpu_put(vcpu);
334 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
335 struct kvm_mp_state *mp_state)
337 if (vcpu->arch.power_off)
338 mp_state->mp_state = KVM_MP_STATE_STOPPED;
340 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
345 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
346 struct kvm_mp_state *mp_state)
348 switch (mp_state->mp_state) {
349 case KVM_MP_STATE_RUNNABLE:
350 vcpu->arch.power_off = false;
352 case KVM_MP_STATE_STOPPED:
353 vcpu->arch.power_off = true;
363 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
364 * @v: The VCPU pointer
366 * If the guest CPU is not waiting for interrupts or an interrupt line is
367 * asserted, the CPU is by definition runnable.
369 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
371 return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
372 && !v->arch.power_off && !v->arch.pause);
375 /* Just ensure a guest exit from a particular CPU */
376 static void exit_vm_noop(void *info)
380 void force_vm_exit(const cpumask_t *mask)
383 smp_call_function_many(mask, exit_vm_noop, NULL, true);
388 * need_new_vmid_gen - check that the VMID is still valid
389 * @kvm: The VM's VMID to check
391 * return true if there is a new generation of VMIDs being used
393 * The hardware supports only 256 values with the value zero reserved for the
394 * host, so we check if an assigned value belongs to a previous generation,
395 * which which requires us to assign a new value. If we're the first to use a
396 * VMID for the new generation, we must flush necessary caches and TLBs on all
399 static bool need_new_vmid_gen(struct kvm *kvm)
401 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
405 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
406 * @kvm The guest that we are about to run
408 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
409 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
412 static void update_vttbr(struct kvm *kvm)
414 phys_addr_t pgd_phys;
417 if (!need_new_vmid_gen(kvm))
420 spin_lock(&kvm_vmid_lock);
423 * We need to re-check the vmid_gen here to ensure that if another vcpu
424 * already allocated a valid vmid for this vm, then this vcpu should
427 if (!need_new_vmid_gen(kvm)) {
428 spin_unlock(&kvm_vmid_lock);
432 /* First user of a new VMID generation? */
433 if (unlikely(kvm_next_vmid == 0)) {
434 atomic64_inc(&kvm_vmid_gen);
438 * On SMP we know no other CPUs can use this CPU's or each
439 * other's VMID after force_vm_exit returns since the
440 * kvm_vmid_lock blocks them from reentry to the guest.
442 force_vm_exit(cpu_all_mask);
444 * Now broadcast TLB + ICACHE invalidation over the inner
445 * shareable domain to make sure all data structures are
448 kvm_call_hyp(__kvm_flush_vm_context);
451 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
452 kvm->arch.vmid = kvm_next_vmid;
454 kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
456 /* update vttbr to be used with the new vmid */
457 pgd_phys = virt_to_phys(kvm->arch.pgd);
458 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
459 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
460 kvm->arch.vttbr = pgd_phys | vmid;
462 spin_unlock(&kvm_vmid_lock);
465 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
467 struct kvm *kvm = vcpu->kvm;
470 if (likely(vcpu->arch.has_run_once))
473 vcpu->arch.has_run_once = true;
476 * Map the VGIC hardware resources before running a vcpu the first
479 if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
480 ret = kvm_vgic_map_resources(kvm);
486 * Enable the arch timers only if we have an in-kernel VGIC
487 * and it has been properly initialized, since we cannot handle
488 * interrupts from the virtual timer with a userspace gic.
490 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
491 ret = kvm_timer_enable(vcpu);
496 bool kvm_arch_intc_initialized(struct kvm *kvm)
498 return vgic_initialized(kvm);
501 void kvm_arm_halt_guest(struct kvm *kvm)
504 struct kvm_vcpu *vcpu;
506 kvm_for_each_vcpu(i, vcpu, kvm)
507 vcpu->arch.pause = true;
508 kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
511 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
513 vcpu->arch.pause = true;
517 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
519 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
521 vcpu->arch.pause = false;
525 void kvm_arm_resume_guest(struct kvm *kvm)
528 struct kvm_vcpu *vcpu;
530 kvm_for_each_vcpu(i, vcpu, kvm)
531 kvm_arm_resume_vcpu(vcpu);
534 static void vcpu_sleep(struct kvm_vcpu *vcpu)
536 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
538 swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
539 (!vcpu->arch.pause)));
542 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
544 return vcpu->arch.target >= 0;
548 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
549 * @vcpu: The VCPU pointer
550 * @run: The kvm_run structure pointer used for userspace state exchange
552 * This function is called through the VCPU_RUN ioctl called from user space. It
553 * will execute VM code in a loop until the time slice for the process is used
554 * or some emulation is needed from user space in which case the function will
555 * return with return value 0 and with the kvm_run structure filled in with the
556 * required data for the requested emulation.
558 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
563 if (unlikely(!kvm_vcpu_initialized(vcpu)))
566 ret = kvm_vcpu_first_run_init(vcpu);
570 if (run->exit_reason == KVM_EXIT_MMIO) {
571 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
576 if (vcpu->sigset_active)
577 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
580 run->exit_reason = KVM_EXIT_UNKNOWN;
583 * Check conditions before entering the guest
587 update_vttbr(vcpu->kvm);
589 if (vcpu->arch.power_off || vcpu->arch.pause)
593 * Preparing the interrupts to be injected also
594 * involves poking the GIC, which must be done in a
595 * non-preemptible context.
598 kvm_pmu_flush_hwstate(vcpu);
599 kvm_timer_flush_hwstate(vcpu);
600 kvm_vgic_flush_hwstate(vcpu);
605 * Re-check atomic conditions
607 if (signal_pending(current)) {
609 run->exit_reason = KVM_EXIT_INTR;
612 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
613 vcpu->arch.power_off || vcpu->arch.pause) {
615 kvm_pmu_sync_hwstate(vcpu);
616 kvm_timer_sync_hwstate(vcpu);
617 kvm_vgic_sync_hwstate(vcpu);
622 kvm_arm_setup_debug(vcpu);
624 /**************************************************************
627 trace_kvm_entry(*vcpu_pc(vcpu));
628 guest_enter_irqoff();
629 vcpu->mode = IN_GUEST_MODE;
631 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
633 vcpu->mode = OUTSIDE_GUEST_MODE;
637 *************************************************************/
639 kvm_arm_clear_debug(vcpu);
642 * We may have taken a host interrupt in HYP mode (ie
643 * while executing the guest). This interrupt is still
644 * pending, as we haven't serviced it yet!
646 * We're now back in SVC mode, with interrupts
647 * disabled. Enabling the interrupts now will have
648 * the effect of taking the interrupt again, in SVC
654 * We do local_irq_enable() before calling guest_exit() so
655 * that if a timer interrupt hits while running the guest we
656 * account that tick as being spent in the guest. We enable
657 * preemption after calling guest_exit() so that if we get
658 * preempted we make sure ticks after that is not counted as
662 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
665 * We must sync the PMU and timer state before the vgic state so
666 * that the vgic can properly sample the updated state of the
669 kvm_pmu_sync_hwstate(vcpu);
670 kvm_timer_sync_hwstate(vcpu);
672 kvm_vgic_sync_hwstate(vcpu);
676 ret = handle_exit(vcpu, run, ret);
679 if (vcpu->sigset_active)
680 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
684 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
690 if (number == KVM_ARM_IRQ_CPU_IRQ)
691 bit_index = __ffs(HCR_VI);
692 else /* KVM_ARM_IRQ_CPU_FIQ */
693 bit_index = __ffs(HCR_VF);
695 ptr = (unsigned long *)&vcpu->arch.irq_lines;
697 set = test_and_set_bit(bit_index, ptr);
699 set = test_and_clear_bit(bit_index, ptr);
702 * If we didn't change anything, no need to wake up or kick other CPUs
708 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
709 * trigger a world-switch round on the running physical CPU to set the
710 * virtual IRQ/FIQ fields in the HCR appropriately.
717 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
720 u32 irq = irq_level->irq;
721 unsigned int irq_type, vcpu_idx, irq_num;
722 int nrcpus = atomic_read(&kvm->online_vcpus);
723 struct kvm_vcpu *vcpu = NULL;
724 bool level = irq_level->level;
726 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
727 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
728 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
730 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
733 case KVM_ARM_IRQ_TYPE_CPU:
734 if (irqchip_in_kernel(kvm))
737 if (vcpu_idx >= nrcpus)
740 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
744 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
747 return vcpu_interrupt_line(vcpu, irq_num, level);
748 case KVM_ARM_IRQ_TYPE_PPI:
749 if (!irqchip_in_kernel(kvm))
752 if (vcpu_idx >= nrcpus)
755 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
759 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
762 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
763 case KVM_ARM_IRQ_TYPE_SPI:
764 if (!irqchip_in_kernel(kvm))
767 if (irq_num < VGIC_NR_PRIVATE_IRQS)
770 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
776 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
777 const struct kvm_vcpu_init *init)
780 int phys_target = kvm_target_cpu();
782 if (init->target != phys_target)
786 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
787 * use the same target.
789 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
792 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
793 for (i = 0; i < sizeof(init->features) * 8; i++) {
794 bool set = (init->features[i / 32] & (1 << (i % 32)));
796 if (set && i >= KVM_VCPU_MAX_FEATURES)
800 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
801 * use the same feature set.
803 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
804 test_bit(i, vcpu->arch.features) != set)
808 set_bit(i, vcpu->arch.features);
811 vcpu->arch.target = phys_target;
813 /* Now we know what it is, we can reset it. */
814 return kvm_reset_vcpu(vcpu);
818 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
819 struct kvm_vcpu_init *init)
823 ret = kvm_vcpu_set_target(vcpu, init);
828 * Ensure a rebooted VM will fault in RAM pages and detect if the
829 * guest MMU is turned off and flush the caches as needed.
831 if (vcpu->arch.has_run_once)
832 stage2_unmap_vm(vcpu->kvm);
834 vcpu_reset_hcr(vcpu);
837 * Handle the "start in power-off" case.
839 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
840 vcpu->arch.power_off = true;
842 vcpu->arch.power_off = false;
847 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
848 struct kvm_device_attr *attr)
852 switch (attr->group) {
854 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
861 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
862 struct kvm_device_attr *attr)
866 switch (attr->group) {
868 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
875 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
876 struct kvm_device_attr *attr)
880 switch (attr->group) {
882 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
889 long kvm_arch_vcpu_ioctl(struct file *filp,
890 unsigned int ioctl, unsigned long arg)
892 struct kvm_vcpu *vcpu = filp->private_data;
893 void __user *argp = (void __user *)arg;
894 struct kvm_device_attr attr;
897 case KVM_ARM_VCPU_INIT: {
898 struct kvm_vcpu_init init;
900 if (copy_from_user(&init, argp, sizeof(init)))
903 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
905 case KVM_SET_ONE_REG:
906 case KVM_GET_ONE_REG: {
907 struct kvm_one_reg reg;
909 if (unlikely(!kvm_vcpu_initialized(vcpu)))
912 if (copy_from_user(®, argp, sizeof(reg)))
914 if (ioctl == KVM_SET_ONE_REG)
915 return kvm_arm_set_reg(vcpu, ®);
917 return kvm_arm_get_reg(vcpu, ®);
919 case KVM_GET_REG_LIST: {
920 struct kvm_reg_list __user *user_list = argp;
921 struct kvm_reg_list reg_list;
924 if (unlikely(!kvm_vcpu_initialized(vcpu)))
927 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
930 reg_list.n = kvm_arm_num_regs(vcpu);
931 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
935 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
937 case KVM_SET_DEVICE_ATTR: {
938 if (copy_from_user(&attr, argp, sizeof(attr)))
940 return kvm_arm_vcpu_set_attr(vcpu, &attr);
942 case KVM_GET_DEVICE_ATTR: {
943 if (copy_from_user(&attr, argp, sizeof(attr)))
945 return kvm_arm_vcpu_get_attr(vcpu, &attr);
947 case KVM_HAS_DEVICE_ATTR: {
948 if (copy_from_user(&attr, argp, sizeof(attr)))
950 return kvm_arm_vcpu_has_attr(vcpu, &attr);
958 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
960 * @log: slot id and address to which we copy the log
962 * Steps 1-4 below provide general overview of dirty page logging. See
963 * kvm_get_dirty_log_protect() function description for additional details.
965 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
966 * always flush the TLB (step 4) even if previous step failed and the dirty
967 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
968 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
969 * writes will be marked dirty for next log read.
971 * 1. Take a snapshot of the bit and clear it if needed.
972 * 2. Write protect the corresponding page.
973 * 3. Copy the snapshot to the userspace.
974 * 4. Flush TLB's if needed.
976 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
978 bool is_dirty = false;
981 mutex_lock(&kvm->slots_lock);
983 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
986 kvm_flush_remote_tlbs(kvm);
988 mutex_unlock(&kvm->slots_lock);
992 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
993 struct kvm_arm_device_addr *dev_addr)
995 unsigned long dev_id, type;
997 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
998 KVM_ARM_DEVICE_ID_SHIFT;
999 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1000 KVM_ARM_DEVICE_TYPE_SHIFT;
1003 case KVM_ARM_DEVICE_VGIC_V2:
1006 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1012 long kvm_arch_vm_ioctl(struct file *filp,
1013 unsigned int ioctl, unsigned long arg)
1015 struct kvm *kvm = filp->private_data;
1016 void __user *argp = (void __user *)arg;
1019 case KVM_CREATE_IRQCHIP: {
1023 mutex_lock(&kvm->lock);
1024 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1025 mutex_unlock(&kvm->lock);
1028 case KVM_ARM_SET_DEVICE_ADDR: {
1029 struct kvm_arm_device_addr dev_addr;
1031 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1033 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1035 case KVM_ARM_PREFERRED_TARGET: {
1037 struct kvm_vcpu_init init;
1039 err = kvm_vcpu_preferred_target(&init);
1043 if (copy_to_user(argp, &init, sizeof(init)))
1053 static void cpu_init_hyp_mode(void *dummy)
1055 phys_addr_t pgd_ptr;
1056 unsigned long hyp_stack_ptr;
1057 unsigned long stack_page;
1058 unsigned long vector_ptr;
1060 /* Switch from the HYP stub to our own HYP init vector */
1061 __hyp_set_vectors(kvm_get_idmap_vector());
1063 pgd_ptr = kvm_mmu_get_httbr();
1064 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1065 hyp_stack_ptr = stack_page + PAGE_SIZE;
1066 vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1068 __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1069 __cpu_init_stage2();
1071 kvm_arm_init_debug();
1074 static void cpu_hyp_reinit(void)
1076 if (is_kernel_in_hyp_mode()) {
1078 * __cpu_init_stage2() is safe to call even if the PM
1079 * event was cancelled before the CPU was reset.
1081 __cpu_init_stage2();
1083 if (__hyp_get_vectors() == hyp_default_vectors)
1084 cpu_init_hyp_mode(NULL);
1088 static void cpu_hyp_reset(void)
1090 if (!is_kernel_in_hyp_mode())
1091 __cpu_reset_hyp_mode(hyp_default_vectors,
1092 kvm_get_idmap_start());
1095 static void _kvm_arch_hardware_enable(void *discard)
1097 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1099 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1103 int kvm_arch_hardware_enable(void)
1105 _kvm_arch_hardware_enable(NULL);
1109 static void _kvm_arch_hardware_disable(void *discard)
1111 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1113 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1117 void kvm_arch_hardware_disable(void)
1119 _kvm_arch_hardware_disable(NULL);
1122 #ifdef CONFIG_CPU_PM
1123 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1128 * kvm_arm_hardware_enabled is left with its old value over
1129 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1134 if (__this_cpu_read(kvm_arm_hardware_enabled))
1136 * don't update kvm_arm_hardware_enabled here
1137 * so that the hardware will be re-enabled
1138 * when we resume. See below.
1144 if (__this_cpu_read(kvm_arm_hardware_enabled))
1145 /* The hardware was enabled before suspend. */
1155 static struct notifier_block hyp_init_cpu_pm_nb = {
1156 .notifier_call = hyp_init_cpu_pm_notifier,
1159 static void __init hyp_cpu_pm_init(void)
1161 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1163 static void __init hyp_cpu_pm_exit(void)
1165 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1168 static inline void hyp_cpu_pm_init(void)
1171 static inline void hyp_cpu_pm_exit(void)
1176 static void teardown_common_resources(void)
1178 free_percpu(kvm_host_cpu_state);
1181 static int init_common_resources(void)
1183 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1184 if (!kvm_host_cpu_state) {
1185 kvm_err("Cannot allocate host CPU state\n");
1189 /* set size of VMID supported by CPU */
1190 kvm_vmid_bits = kvm_get_vmid_bits();
1191 kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1196 static int init_subsystems(void)
1201 * Enable hardware so that subsystem initialisation can access EL2.
1203 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1206 * Register CPU lower-power notifier
1211 * Init HYP view of VGIC
1213 err = kvm_vgic_hyp_init();
1216 vgic_present = true;
1220 vgic_present = false;
1228 * Init HYP architected timer support
1230 err = kvm_timer_hyp_init();
1235 kvm_coproc_table_init();
1238 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1243 static void teardown_hyp_mode(void)
1247 if (is_kernel_in_hyp_mode())
1251 for_each_possible_cpu(cpu)
1252 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1256 static int init_vhe_mode(void)
1258 kvm_info("VHE mode initialized successfully\n");
1263 * Inits Hyp-mode on all online CPUs
1265 static int init_hyp_mode(void)
1271 * Allocate Hyp PGD and setup Hyp identity mapping
1273 err = kvm_mmu_init();
1278 * It is probably enough to obtain the default on one
1279 * CPU. It's unlikely to be different on the others.
1281 hyp_default_vectors = __hyp_get_vectors();
1284 * Allocate stack pages for Hypervisor-mode
1286 for_each_possible_cpu(cpu) {
1287 unsigned long stack_page;
1289 stack_page = __get_free_page(GFP_KERNEL);
1295 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1299 * Map the Hyp-code called directly from the host
1301 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1302 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1304 kvm_err("Cannot map world-switch code\n");
1308 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1309 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1311 kvm_err("Cannot map rodata section\n");
1316 * Map the Hyp stack pages
1318 for_each_possible_cpu(cpu) {
1319 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1320 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1324 kvm_err("Cannot map hyp stack\n");
1329 for_each_possible_cpu(cpu) {
1330 kvm_cpu_context_t *cpu_ctxt;
1332 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1333 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1336 kvm_err("Cannot map host CPU state: %d\n", err);
1341 kvm_info("Hyp mode initialized successfully\n");
1346 teardown_hyp_mode();
1347 kvm_err("error initializing Hyp mode: %d\n", err);
1351 static void check_kvm_target_cpu(void *ret)
1353 *(int *)ret = kvm_target_cpu();
1356 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1358 struct kvm_vcpu *vcpu;
1361 mpidr &= MPIDR_HWID_BITMASK;
1362 kvm_for_each_vcpu(i, vcpu, kvm) {
1363 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1370 * Initialize Hyp-mode and memory mappings on all CPUs.
1372 int kvm_arch_init(void *opaque)
1377 if (!is_hyp_mode_available()) {
1378 kvm_err("HYP mode not available\n");
1382 for_each_online_cpu(cpu) {
1383 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1385 kvm_err("Error, CPU %d not supported!\n", cpu);
1390 err = init_common_resources();
1394 if (is_kernel_in_hyp_mode())
1395 err = init_vhe_mode();
1397 err = init_hyp_mode();
1401 err = init_subsystems();
1408 teardown_hyp_mode();
1410 teardown_common_resources();
1414 /* NOP: Compiling as a module not supported */
1415 void kvm_arch_exit(void)
1417 kvm_perf_teardown();
1420 static int arm_init(void)
1422 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1426 module_init(arm_init);