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 <linux/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 kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
123 if (!kvm->arch.last_vcpu_ran)
126 for_each_possible_cpu(cpu)
127 *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
129 ret = kvm_alloc_stage2_pgd(kvm);
133 ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
135 goto out_free_stage2_pgd;
137 kvm_vgic_early_init(kvm);
139 /* Mark the initial VMID generation invalid */
140 kvm->arch.vmid_gen = 0;
142 /* The maximum number of VCPUs is limited by the host's GIC model */
143 kvm->arch.max_vcpus = vgic_present ?
144 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
148 kvm_free_stage2_pgd(kvm);
150 free_percpu(kvm->arch.last_vcpu_ran);
151 kvm->arch.last_vcpu_ran = NULL;
155 bool kvm_arch_has_vcpu_debugfs(void)
160 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
165 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
167 return VM_FAULT_SIGBUS;
172 * kvm_arch_destroy_vm - destroy the VM data structure
173 * @kvm: pointer to the KVM struct
175 void kvm_arch_destroy_vm(struct kvm *kvm)
179 free_percpu(kvm->arch.last_vcpu_ran);
180 kvm->arch.last_vcpu_ran = NULL;
182 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
184 kvm_arch_vcpu_free(kvm->vcpus[i]);
185 kvm->vcpus[i] = NULL;
189 kvm_vgic_destroy(kvm);
192 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
196 case KVM_CAP_IRQCHIP:
199 case KVM_CAP_IOEVENTFD:
200 case KVM_CAP_DEVICE_CTRL:
201 case KVM_CAP_USER_MEMORY:
202 case KVM_CAP_SYNC_MMU:
203 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
204 case KVM_CAP_ONE_REG:
205 case KVM_CAP_ARM_PSCI:
206 case KVM_CAP_ARM_PSCI_0_2:
207 case KVM_CAP_READONLY_MEM:
208 case KVM_CAP_MP_STATE:
209 case KVM_CAP_IMMEDIATE_EXIT:
212 case KVM_CAP_COALESCED_MMIO:
213 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
215 case KVM_CAP_ARM_SET_DEVICE_ADDR:
218 case KVM_CAP_NR_VCPUS:
219 r = num_online_cpus();
221 case KVM_CAP_MAX_VCPUS:
224 case KVM_CAP_MSI_DEVID:
228 r = kvm->arch.vgic.msis_require_devid;
231 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
237 long kvm_arch_dev_ioctl(struct file *filp,
238 unsigned int ioctl, unsigned long arg)
244 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
247 struct kvm_vcpu *vcpu;
249 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
254 if (id >= kvm->arch.max_vcpus) {
259 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
265 err = kvm_vcpu_init(vcpu, kvm, id);
269 err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
275 kvm_vcpu_uninit(vcpu);
277 kmem_cache_free(kvm_vcpu_cache, vcpu);
282 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
284 kvm_vgic_vcpu_early_init(vcpu);
287 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
289 kvm_mmu_free_memory_caches(vcpu);
290 kvm_timer_vcpu_terminate(vcpu);
291 kvm_vgic_vcpu_destroy(vcpu);
292 kvm_pmu_vcpu_destroy(vcpu);
293 kvm_vcpu_uninit(vcpu);
294 kmem_cache_free(kvm_vcpu_cache, vcpu);
297 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
299 kvm_arch_vcpu_free(vcpu);
302 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
304 return kvm_timer_should_fire(vcpu_vtimer(vcpu)) ||
305 kvm_timer_should_fire(vcpu_ptimer(vcpu));
308 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
310 kvm_timer_schedule(vcpu);
313 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
315 kvm_timer_unschedule(vcpu);
318 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
320 /* Force users to call KVM_ARM_VCPU_INIT */
321 vcpu->arch.target = -1;
322 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
324 /* Set up the timer */
325 kvm_timer_vcpu_init(vcpu);
327 kvm_arm_reset_debug_ptr(vcpu);
332 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
336 last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
339 * We might get preempted before the vCPU actually runs, but
340 * over-invalidation doesn't affect correctness.
342 if (*last_ran != vcpu->vcpu_id) {
343 kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
344 *last_ran = vcpu->vcpu_id;
348 vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
350 kvm_arm_set_running_vcpu(vcpu);
353 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
356 * The arch-generic KVM code expects the cpu field of a vcpu to be -1
357 * if the vcpu is no longer assigned to a cpu. This is used for the
358 * optimized make_all_cpus_request path.
362 kvm_arm_set_running_vcpu(NULL);
363 kvm_timer_vcpu_put(vcpu);
366 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
367 struct kvm_mp_state *mp_state)
369 if (vcpu->arch.power_off)
370 mp_state->mp_state = KVM_MP_STATE_STOPPED;
372 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
377 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
378 struct kvm_mp_state *mp_state)
380 switch (mp_state->mp_state) {
381 case KVM_MP_STATE_RUNNABLE:
382 vcpu->arch.power_off = false;
384 case KVM_MP_STATE_STOPPED:
385 vcpu->arch.power_off = true;
395 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
396 * @v: The VCPU pointer
398 * If the guest CPU is not waiting for interrupts or an interrupt line is
399 * asserted, the CPU is by definition runnable.
401 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
403 return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v))
404 && !v->arch.power_off && !v->arch.pause);
407 /* Just ensure a guest exit from a particular CPU */
408 static void exit_vm_noop(void *info)
412 void force_vm_exit(const cpumask_t *mask)
415 smp_call_function_many(mask, exit_vm_noop, NULL, true);
420 * need_new_vmid_gen - check that the VMID is still valid
421 * @kvm: The VM's VMID to check
423 * return true if there is a new generation of VMIDs being used
425 * The hardware supports only 256 values with the value zero reserved for the
426 * host, so we check if an assigned value belongs to a previous generation,
427 * which which requires us to assign a new value. If we're the first to use a
428 * VMID for the new generation, we must flush necessary caches and TLBs on all
431 static bool need_new_vmid_gen(struct kvm *kvm)
433 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
437 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
438 * @kvm The guest that we are about to run
440 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
441 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
444 static void update_vttbr(struct kvm *kvm)
446 phys_addr_t pgd_phys;
449 if (!need_new_vmid_gen(kvm))
452 spin_lock(&kvm_vmid_lock);
455 * We need to re-check the vmid_gen here to ensure that if another vcpu
456 * already allocated a valid vmid for this vm, then this vcpu should
459 if (!need_new_vmid_gen(kvm)) {
460 spin_unlock(&kvm_vmid_lock);
464 /* First user of a new VMID generation? */
465 if (unlikely(kvm_next_vmid == 0)) {
466 atomic64_inc(&kvm_vmid_gen);
470 * On SMP we know no other CPUs can use this CPU's or each
471 * other's VMID after force_vm_exit returns since the
472 * kvm_vmid_lock blocks them from reentry to the guest.
474 force_vm_exit(cpu_all_mask);
476 * Now broadcast TLB + ICACHE invalidation over the inner
477 * shareable domain to make sure all data structures are
480 kvm_call_hyp(__kvm_flush_vm_context);
483 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
484 kvm->arch.vmid = kvm_next_vmid;
486 kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
488 /* update vttbr to be used with the new vmid */
489 pgd_phys = virt_to_phys(kvm->arch.pgd);
490 BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
491 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
492 kvm->arch.vttbr = pgd_phys | vmid;
494 spin_unlock(&kvm_vmid_lock);
497 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
499 struct kvm *kvm = vcpu->kvm;
502 if (likely(vcpu->arch.has_run_once))
505 vcpu->arch.has_run_once = true;
508 * Map the VGIC hardware resources before running a vcpu the first
511 if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
512 ret = kvm_vgic_map_resources(kvm);
518 * Enable the arch timers only if we have an in-kernel VGIC
519 * and it has been properly initialized, since we cannot handle
520 * interrupts from the virtual timer with a userspace gic.
522 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
523 ret = kvm_timer_enable(vcpu);
528 bool kvm_arch_intc_initialized(struct kvm *kvm)
530 return vgic_initialized(kvm);
533 void kvm_arm_halt_guest(struct kvm *kvm)
536 struct kvm_vcpu *vcpu;
538 kvm_for_each_vcpu(i, vcpu, kvm)
539 vcpu->arch.pause = true;
540 kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT);
543 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu)
545 vcpu->arch.pause = true;
549 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu)
551 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
553 vcpu->arch.pause = false;
557 void kvm_arm_resume_guest(struct kvm *kvm)
560 struct kvm_vcpu *vcpu;
562 kvm_for_each_vcpu(i, vcpu, kvm)
563 kvm_arm_resume_vcpu(vcpu);
566 static void vcpu_sleep(struct kvm_vcpu *vcpu)
568 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
570 swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
571 (!vcpu->arch.pause)));
574 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
576 return vcpu->arch.target >= 0;
580 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
581 * @vcpu: The VCPU pointer
582 * @run: The kvm_run structure pointer used for userspace state exchange
584 * This function is called through the VCPU_RUN ioctl called from user space. It
585 * will execute VM code in a loop until the time slice for the process is used
586 * or some emulation is needed from user space in which case the function will
587 * return with return value 0 and with the kvm_run structure filled in with the
588 * required data for the requested emulation.
590 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
595 if (unlikely(!kvm_vcpu_initialized(vcpu)))
598 ret = kvm_vcpu_first_run_init(vcpu);
602 if (run->exit_reason == KVM_EXIT_MMIO) {
603 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
608 if (run->immediate_exit)
611 if (vcpu->sigset_active)
612 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
615 run->exit_reason = KVM_EXIT_UNKNOWN;
618 * Check conditions before entering the guest
622 update_vttbr(vcpu->kvm);
624 if (vcpu->arch.power_off || vcpu->arch.pause)
628 * Preparing the interrupts to be injected also
629 * involves poking the GIC, which must be done in a
630 * non-preemptible context.
633 kvm_pmu_flush_hwstate(vcpu);
634 kvm_timer_flush_hwstate(vcpu);
635 kvm_vgic_flush_hwstate(vcpu);
640 * Re-check atomic conditions
642 if (signal_pending(current)) {
644 run->exit_reason = KVM_EXIT_INTR;
647 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
648 vcpu->arch.power_off || vcpu->arch.pause) {
650 kvm_pmu_sync_hwstate(vcpu);
651 kvm_timer_sync_hwstate(vcpu);
652 kvm_vgic_sync_hwstate(vcpu);
657 kvm_arm_setup_debug(vcpu);
659 /**************************************************************
662 trace_kvm_entry(*vcpu_pc(vcpu));
663 guest_enter_irqoff();
664 vcpu->mode = IN_GUEST_MODE;
666 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
668 vcpu->mode = OUTSIDE_GUEST_MODE;
672 *************************************************************/
674 kvm_arm_clear_debug(vcpu);
677 * We may have taken a host interrupt in HYP mode (ie
678 * while executing the guest). This interrupt is still
679 * pending, as we haven't serviced it yet!
681 * We're now back in SVC mode, with interrupts
682 * disabled. Enabling the interrupts now will have
683 * the effect of taking the interrupt again, in SVC
689 * We do local_irq_enable() before calling guest_exit() so
690 * that if a timer interrupt hits while running the guest we
691 * account that tick as being spent in the guest. We enable
692 * preemption after calling guest_exit() so that if we get
693 * preempted we make sure ticks after that is not counted as
697 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
700 * We must sync the PMU and timer state before the vgic state so
701 * that the vgic can properly sample the updated state of the
704 kvm_pmu_sync_hwstate(vcpu);
705 kvm_timer_sync_hwstate(vcpu);
707 kvm_vgic_sync_hwstate(vcpu);
711 ret = handle_exit(vcpu, run, ret);
714 if (vcpu->sigset_active)
715 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
719 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
725 if (number == KVM_ARM_IRQ_CPU_IRQ)
726 bit_index = __ffs(HCR_VI);
727 else /* KVM_ARM_IRQ_CPU_FIQ */
728 bit_index = __ffs(HCR_VF);
730 ptr = (unsigned long *)&vcpu->arch.irq_lines;
732 set = test_and_set_bit(bit_index, ptr);
734 set = test_and_clear_bit(bit_index, ptr);
737 * If we didn't change anything, no need to wake up or kick other CPUs
743 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
744 * trigger a world-switch round on the running physical CPU to set the
745 * virtual IRQ/FIQ fields in the HCR appropriately.
752 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
755 u32 irq = irq_level->irq;
756 unsigned int irq_type, vcpu_idx, irq_num;
757 int nrcpus = atomic_read(&kvm->online_vcpus);
758 struct kvm_vcpu *vcpu = NULL;
759 bool level = irq_level->level;
761 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
762 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
763 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
765 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
768 case KVM_ARM_IRQ_TYPE_CPU:
769 if (irqchip_in_kernel(kvm))
772 if (vcpu_idx >= nrcpus)
775 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
779 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
782 return vcpu_interrupt_line(vcpu, irq_num, level);
783 case KVM_ARM_IRQ_TYPE_PPI:
784 if (!irqchip_in_kernel(kvm))
787 if (vcpu_idx >= nrcpus)
790 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
794 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
797 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
798 case KVM_ARM_IRQ_TYPE_SPI:
799 if (!irqchip_in_kernel(kvm))
802 if (irq_num < VGIC_NR_PRIVATE_IRQS)
805 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
811 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
812 const struct kvm_vcpu_init *init)
815 int phys_target = kvm_target_cpu();
817 if (init->target != phys_target)
821 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
822 * use the same target.
824 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
827 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
828 for (i = 0; i < sizeof(init->features) * 8; i++) {
829 bool set = (init->features[i / 32] & (1 << (i % 32)));
831 if (set && i >= KVM_VCPU_MAX_FEATURES)
835 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
836 * use the same feature set.
838 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
839 test_bit(i, vcpu->arch.features) != set)
843 set_bit(i, vcpu->arch.features);
846 vcpu->arch.target = phys_target;
848 /* Now we know what it is, we can reset it. */
849 return kvm_reset_vcpu(vcpu);
853 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
854 struct kvm_vcpu_init *init)
858 ret = kvm_vcpu_set_target(vcpu, init);
863 * Ensure a rebooted VM will fault in RAM pages and detect if the
864 * guest MMU is turned off and flush the caches as needed.
866 if (vcpu->arch.has_run_once)
867 stage2_unmap_vm(vcpu->kvm);
869 vcpu_reset_hcr(vcpu);
872 * Handle the "start in power-off" case.
874 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
875 vcpu->arch.power_off = true;
877 vcpu->arch.power_off = false;
882 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
883 struct kvm_device_attr *attr)
887 switch (attr->group) {
889 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
896 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
897 struct kvm_device_attr *attr)
901 switch (attr->group) {
903 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
910 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
911 struct kvm_device_attr *attr)
915 switch (attr->group) {
917 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
924 long kvm_arch_vcpu_ioctl(struct file *filp,
925 unsigned int ioctl, unsigned long arg)
927 struct kvm_vcpu *vcpu = filp->private_data;
928 void __user *argp = (void __user *)arg;
929 struct kvm_device_attr attr;
932 case KVM_ARM_VCPU_INIT: {
933 struct kvm_vcpu_init init;
935 if (copy_from_user(&init, argp, sizeof(init)))
938 return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
940 case KVM_SET_ONE_REG:
941 case KVM_GET_ONE_REG: {
942 struct kvm_one_reg reg;
944 if (unlikely(!kvm_vcpu_initialized(vcpu)))
947 if (copy_from_user(®, argp, sizeof(reg)))
949 if (ioctl == KVM_SET_ONE_REG)
950 return kvm_arm_set_reg(vcpu, ®);
952 return kvm_arm_get_reg(vcpu, ®);
954 case KVM_GET_REG_LIST: {
955 struct kvm_reg_list __user *user_list = argp;
956 struct kvm_reg_list reg_list;
959 if (unlikely(!kvm_vcpu_initialized(vcpu)))
962 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
965 reg_list.n = kvm_arm_num_regs(vcpu);
966 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
970 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
972 case KVM_SET_DEVICE_ATTR: {
973 if (copy_from_user(&attr, argp, sizeof(attr)))
975 return kvm_arm_vcpu_set_attr(vcpu, &attr);
977 case KVM_GET_DEVICE_ATTR: {
978 if (copy_from_user(&attr, argp, sizeof(attr)))
980 return kvm_arm_vcpu_get_attr(vcpu, &attr);
982 case KVM_HAS_DEVICE_ATTR: {
983 if (copy_from_user(&attr, argp, sizeof(attr)))
985 return kvm_arm_vcpu_has_attr(vcpu, &attr);
993 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
995 * @log: slot id and address to which we copy the log
997 * Steps 1-4 below provide general overview of dirty page logging. See
998 * kvm_get_dirty_log_protect() function description for additional details.
1000 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1001 * always flush the TLB (step 4) even if previous step failed and the dirty
1002 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1003 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1004 * writes will be marked dirty for next log read.
1006 * 1. Take a snapshot of the bit and clear it if needed.
1007 * 2. Write protect the corresponding page.
1008 * 3. Copy the snapshot to the userspace.
1009 * 4. Flush TLB's if needed.
1011 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1013 bool is_dirty = false;
1016 mutex_lock(&kvm->slots_lock);
1018 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
1021 kvm_flush_remote_tlbs(kvm);
1023 mutex_unlock(&kvm->slots_lock);
1027 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1028 struct kvm_arm_device_addr *dev_addr)
1030 unsigned long dev_id, type;
1032 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1033 KVM_ARM_DEVICE_ID_SHIFT;
1034 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1035 KVM_ARM_DEVICE_TYPE_SHIFT;
1038 case KVM_ARM_DEVICE_VGIC_V2:
1041 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1047 long kvm_arch_vm_ioctl(struct file *filp,
1048 unsigned int ioctl, unsigned long arg)
1050 struct kvm *kvm = filp->private_data;
1051 void __user *argp = (void __user *)arg;
1054 case KVM_CREATE_IRQCHIP: {
1058 mutex_lock(&kvm->lock);
1059 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1060 mutex_unlock(&kvm->lock);
1063 case KVM_ARM_SET_DEVICE_ADDR: {
1064 struct kvm_arm_device_addr dev_addr;
1066 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1068 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1070 case KVM_ARM_PREFERRED_TARGET: {
1072 struct kvm_vcpu_init init;
1074 err = kvm_vcpu_preferred_target(&init);
1078 if (copy_to_user(argp, &init, sizeof(init)))
1088 static void cpu_init_hyp_mode(void *dummy)
1090 phys_addr_t pgd_ptr;
1091 unsigned long hyp_stack_ptr;
1092 unsigned long stack_page;
1093 unsigned long vector_ptr;
1095 /* Switch from the HYP stub to our own HYP init vector */
1096 __hyp_set_vectors(kvm_get_idmap_vector());
1098 pgd_ptr = kvm_mmu_get_httbr();
1099 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1100 hyp_stack_ptr = stack_page + PAGE_SIZE;
1101 vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector);
1103 __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1104 __cpu_init_stage2();
1106 if (is_kernel_in_hyp_mode())
1107 kvm_timer_init_vhe();
1109 kvm_arm_init_debug();
1112 static void cpu_hyp_reinit(void)
1114 if (is_kernel_in_hyp_mode()) {
1116 * __cpu_init_stage2() is safe to call even if the PM
1117 * event was cancelled before the CPU was reset.
1119 __cpu_init_stage2();
1121 if (__hyp_get_vectors() == hyp_default_vectors)
1122 cpu_init_hyp_mode(NULL);
1126 static void cpu_hyp_reset(void)
1128 if (!is_kernel_in_hyp_mode())
1129 __cpu_reset_hyp_mode(hyp_default_vectors,
1130 kvm_get_idmap_start());
1133 static void _kvm_arch_hardware_enable(void *discard)
1135 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1137 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1141 int kvm_arch_hardware_enable(void)
1143 _kvm_arch_hardware_enable(NULL);
1147 static void _kvm_arch_hardware_disable(void *discard)
1149 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1151 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1155 void kvm_arch_hardware_disable(void)
1157 _kvm_arch_hardware_disable(NULL);
1160 #ifdef CONFIG_CPU_PM
1161 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1166 * kvm_arm_hardware_enabled is left with its old value over
1167 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1172 if (__this_cpu_read(kvm_arm_hardware_enabled))
1174 * don't update kvm_arm_hardware_enabled here
1175 * so that the hardware will be re-enabled
1176 * when we resume. See below.
1182 if (__this_cpu_read(kvm_arm_hardware_enabled))
1183 /* The hardware was enabled before suspend. */
1193 static struct notifier_block hyp_init_cpu_pm_nb = {
1194 .notifier_call = hyp_init_cpu_pm_notifier,
1197 static void __init hyp_cpu_pm_init(void)
1199 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1201 static void __init hyp_cpu_pm_exit(void)
1203 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1206 static inline void hyp_cpu_pm_init(void)
1209 static inline void hyp_cpu_pm_exit(void)
1214 static void teardown_common_resources(void)
1216 free_percpu(kvm_host_cpu_state);
1219 static int init_common_resources(void)
1221 kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
1222 if (!kvm_host_cpu_state) {
1223 kvm_err("Cannot allocate host CPU state\n");
1227 /* set size of VMID supported by CPU */
1228 kvm_vmid_bits = kvm_get_vmid_bits();
1229 kvm_info("%d-bit VMID\n", kvm_vmid_bits);
1234 static int init_subsystems(void)
1239 * Enable hardware so that subsystem initialisation can access EL2.
1241 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1244 * Register CPU lower-power notifier
1249 * Init HYP view of VGIC
1251 err = kvm_vgic_hyp_init();
1254 vgic_present = true;
1258 vgic_present = false;
1266 * Init HYP architected timer support
1268 err = kvm_timer_hyp_init();
1273 kvm_coproc_table_init();
1276 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1281 static void teardown_hyp_mode(void)
1285 if (is_kernel_in_hyp_mode())
1289 for_each_possible_cpu(cpu)
1290 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1294 static int init_vhe_mode(void)
1296 kvm_info("VHE mode initialized successfully\n");
1301 * Inits Hyp-mode on all online CPUs
1303 static int init_hyp_mode(void)
1309 * Allocate Hyp PGD and setup Hyp identity mapping
1311 err = kvm_mmu_init();
1316 * It is probably enough to obtain the default on one
1317 * CPU. It's unlikely to be different on the others.
1319 hyp_default_vectors = __hyp_get_vectors();
1322 * Allocate stack pages for Hypervisor-mode
1324 for_each_possible_cpu(cpu) {
1325 unsigned long stack_page;
1327 stack_page = __get_free_page(GFP_KERNEL);
1333 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1337 * Map the Hyp-code called directly from the host
1339 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1340 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1342 kvm_err("Cannot map world-switch code\n");
1346 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1347 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1349 kvm_err("Cannot map rodata section\n");
1353 err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
1354 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1356 kvm_err("Cannot map bss section\n");
1361 * Map the Hyp stack pages
1363 for_each_possible_cpu(cpu) {
1364 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1365 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1369 kvm_err("Cannot map hyp stack\n");
1374 for_each_possible_cpu(cpu) {
1375 kvm_cpu_context_t *cpu_ctxt;
1377 cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
1378 err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
1381 kvm_err("Cannot map host CPU state: %d\n", err);
1386 kvm_info("Hyp mode initialized successfully\n");
1391 teardown_hyp_mode();
1392 kvm_err("error initializing Hyp mode: %d\n", err);
1396 static void check_kvm_target_cpu(void *ret)
1398 *(int *)ret = kvm_target_cpu();
1401 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1403 struct kvm_vcpu *vcpu;
1406 mpidr &= MPIDR_HWID_BITMASK;
1407 kvm_for_each_vcpu(i, vcpu, kvm) {
1408 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1415 * Initialize Hyp-mode and memory mappings on all CPUs.
1417 int kvm_arch_init(void *opaque)
1422 if (!is_hyp_mode_available()) {
1423 kvm_err("HYP mode not available\n");
1427 for_each_online_cpu(cpu) {
1428 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1430 kvm_err("Error, CPU %d not supported!\n", cpu);
1435 err = init_common_resources();
1439 if (is_kernel_in_hyp_mode())
1440 err = init_vhe_mode();
1442 err = init_hyp_mode();
1446 err = init_subsystems();
1453 teardown_hyp_mode();
1455 teardown_common_resources();
1459 /* NOP: Compiling as a module not supported */
1460 void kvm_arch_exit(void)
1462 kvm_perf_teardown();
1465 static int arm_init(void)
1467 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1471 module_init(arm_init);