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/errno.h>
20 #include <linux/err.h>
21 #include <linux/kvm_host.h>
22 #include <linux/module.h>
23 #include <linux/vmalloc.h>
25 #include <linux/mman.h>
26 #include <linux/sched.h>
27 #include <linux/kvm.h>
28 #include <trace/events/kvm.h>
30 #define CREATE_TRACE_POINTS
33 #include <asm/unified.h>
34 #include <asm/uaccess.h>
35 #include <asm/ptrace.h>
37 #include <asm/cputype.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/opcodes.h>
50 __asm__(".arch_extension virt");
53 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
54 static struct vfp_hard_struct __percpu *kvm_host_vfp_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 u8 kvm_next_vmid;
63 static DEFINE_SPINLOCK(kvm_vmid_lock);
65 static bool vgic_present;
67 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
69 BUG_ON(preemptible());
70 __get_cpu_var(kvm_arm_running_vcpu) = vcpu;
74 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
75 * Must be called from non-preemptible context
77 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
79 BUG_ON(preemptible());
80 return __get_cpu_var(kvm_arm_running_vcpu);
84 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
86 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void)
88 return &kvm_arm_running_vcpu;
91 int kvm_arch_hardware_enable(void *garbage)
96 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
98 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
101 void kvm_arch_hardware_disable(void *garbage)
105 int kvm_arch_hardware_setup(void)
110 void kvm_arch_hardware_unsetup(void)
114 void kvm_arch_check_processor_compat(void *rtn)
119 void kvm_arch_sync_events(struct kvm *kvm)
124 * kvm_arch_init_vm - initializes a VM data structure
125 * @kvm: pointer to the KVM struct
127 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
134 ret = kvm_alloc_stage2_pgd(kvm);
138 ret = create_hyp_mappings(kvm, kvm + 1);
140 goto out_free_stage2_pgd;
142 /* Mark the initial VMID generation invalid */
143 kvm->arch.vmid_gen = 0;
147 kvm_free_stage2_pgd(kvm);
152 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
154 return VM_FAULT_SIGBUS;
157 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
158 struct kvm_memory_slot *dont)
162 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
168 * kvm_arch_destroy_vm - destroy the VM data structure
169 * @kvm: pointer to the KVM struct
171 void kvm_arch_destroy_vm(struct kvm *kvm)
175 kvm_free_stage2_pgd(kvm);
177 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
179 kvm_arch_vcpu_free(kvm->vcpus[i]);
180 kvm->vcpus[i] = NULL;
185 int kvm_dev_ioctl_check_extension(long ext)
189 case KVM_CAP_IRQCHIP:
192 case KVM_CAP_USER_MEMORY:
193 case KVM_CAP_SYNC_MMU:
194 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
195 case KVM_CAP_ONE_REG:
196 case KVM_CAP_ARM_PSCI:
199 case KVM_CAP_COALESCED_MMIO:
200 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
202 case KVM_CAP_ARM_SET_DEVICE_ADDR:
204 case KVM_CAP_NR_VCPUS:
205 r = num_online_cpus();
207 case KVM_CAP_MAX_VCPUS:
217 long kvm_arch_dev_ioctl(struct file *filp,
218 unsigned int ioctl, unsigned long arg)
223 int kvm_arch_set_memory_region(struct kvm *kvm,
224 struct kvm_userspace_memory_region *mem,
225 struct kvm_memory_slot old,
231 int kvm_arch_prepare_memory_region(struct kvm *kvm,
232 struct kvm_memory_slot *memslot,
233 struct kvm_memory_slot old,
234 struct kvm_userspace_memory_region *mem,
240 void kvm_arch_commit_memory_region(struct kvm *kvm,
241 struct kvm_userspace_memory_region *mem,
242 struct kvm_memory_slot old,
247 void kvm_arch_flush_shadow_all(struct kvm *kvm)
251 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
252 struct kvm_memory_slot *slot)
256 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
259 struct kvm_vcpu *vcpu;
261 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
267 err = kvm_vcpu_init(vcpu, kvm, id);
271 err = create_hyp_mappings(vcpu, vcpu + 1);
277 kvm_vcpu_uninit(vcpu);
279 kmem_cache_free(kvm_vcpu_cache, vcpu);
284 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
289 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
291 kvm_mmu_free_memory_caches(vcpu);
292 kvm_timer_vcpu_terminate(vcpu);
293 kmem_cache_free(kvm_vcpu_cache, vcpu);
296 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
298 kvm_arch_vcpu_free(vcpu);
301 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
306 int __attribute_const__ kvm_target_cpu(void)
308 unsigned long implementor = read_cpuid_implementor();
309 unsigned long part_number = read_cpuid_part_number();
311 if (implementor != ARM_CPU_IMP_ARM)
314 switch (part_number) {
315 case ARM_CPU_PART_CORTEX_A15:
316 return KVM_ARM_TARGET_CORTEX_A15;
322 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
326 /* Force users to call KVM_ARM_VCPU_INIT */
327 vcpu->arch.target = -1;
330 ret = kvm_vgic_vcpu_init(vcpu);
334 /* Set up the timer */
335 kvm_timer_vcpu_init(vcpu);
340 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
344 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
347 vcpu->arch.vfp_host = this_cpu_ptr(kvm_host_vfp_state);
350 * Check whether this vcpu requires the cache to be flushed on
351 * this physical CPU. This is a consequence of doing dcache
352 * operations by set/way on this vcpu. We do it here to be in
353 * a non-preemptible section.
355 if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
356 flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
358 kvm_arm_set_running_vcpu(vcpu);
361 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
363 kvm_arm_set_running_vcpu(NULL);
366 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
367 struct kvm_guest_debug *dbg)
373 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
374 struct kvm_mp_state *mp_state)
379 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
380 struct kvm_mp_state *mp_state)
386 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
387 * @v: The VCPU pointer
389 * If the guest CPU is not waiting for interrupts or an interrupt line is
390 * asserted, the CPU is by definition runnable.
392 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
394 return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
397 /* Just ensure a guest exit from a particular CPU */
398 static void exit_vm_noop(void *info)
402 void force_vm_exit(const cpumask_t *mask)
404 smp_call_function_many(mask, exit_vm_noop, NULL, true);
408 * need_new_vmid_gen - check that the VMID is still valid
409 * @kvm: The VM's VMID to checkt
411 * return true if there is a new generation of VMIDs being used
413 * The hardware supports only 256 values with the value zero reserved for the
414 * host, so we check if an assigned value belongs to a previous generation,
415 * which which requires us to assign a new value. If we're the first to use a
416 * VMID for the new generation, we must flush necessary caches and TLBs on all
419 static bool need_new_vmid_gen(struct kvm *kvm)
421 return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
425 * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
426 * @kvm The guest that we are about to run
428 * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
429 * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
432 static void update_vttbr(struct kvm *kvm)
434 phys_addr_t pgd_phys;
437 if (!need_new_vmid_gen(kvm))
440 spin_lock(&kvm_vmid_lock);
443 * We need to re-check the vmid_gen here to ensure that if another vcpu
444 * already allocated a valid vmid for this vm, then this vcpu should
447 if (!need_new_vmid_gen(kvm)) {
448 spin_unlock(&kvm_vmid_lock);
452 /* First user of a new VMID generation? */
453 if (unlikely(kvm_next_vmid == 0)) {
454 atomic64_inc(&kvm_vmid_gen);
458 * On SMP we know no other CPUs can use this CPU's or each
459 * other's VMID after force_vm_exit returns since the
460 * kvm_vmid_lock blocks them from reentry to the guest.
462 force_vm_exit(cpu_all_mask);
464 * Now broadcast TLB + ICACHE invalidation over the inner
465 * shareable domain to make sure all data structures are
468 kvm_call_hyp(__kvm_flush_vm_context);
471 kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
472 kvm->arch.vmid = kvm_next_vmid;
475 /* update vttbr to be used with the new vmid */
476 pgd_phys = virt_to_phys(kvm->arch.pgd);
477 vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
478 kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK;
479 kvm->arch.vttbr |= vmid;
481 spin_unlock(&kvm_vmid_lock);
484 static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
486 /* SVC called from Hyp mode should never get here */
487 kvm_debug("SVC called from Hyp mode shouldn't go here\n");
489 return -EINVAL; /* Squash warning */
492 static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
494 trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
495 vcpu->arch.hsr & HSR_HVC_IMM_MASK);
497 if (kvm_psci_call(vcpu))
500 kvm_inject_undefined(vcpu);
504 static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
506 if (kvm_psci_call(vcpu))
509 kvm_inject_undefined(vcpu);
513 static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
515 /* The hypervisor should never cause aborts */
516 kvm_err("Prefetch Abort taken from Hyp mode at %#08x (HSR: %#08x)\n",
517 vcpu->arch.hxfar, vcpu->arch.hsr);
521 static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
523 /* This is either an error in the ws. code or an external abort */
524 kvm_err("Data Abort taken from Hyp mode at %#08x (HSR: %#08x)\n",
525 vcpu->arch.hxfar, vcpu->arch.hsr);
529 typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
530 static exit_handle_fn arm_exit_handlers[] = {
531 [HSR_EC_WFI] = kvm_handle_wfi,
532 [HSR_EC_CP15_32] = kvm_handle_cp15_32,
533 [HSR_EC_CP15_64] = kvm_handle_cp15_64,
534 [HSR_EC_CP14_MR] = kvm_handle_cp14_access,
535 [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
536 [HSR_EC_CP14_64] = kvm_handle_cp14_access,
537 [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
538 [HSR_EC_CP10_ID] = kvm_handle_cp10_id,
539 [HSR_EC_SVC_HYP] = handle_svc_hyp,
540 [HSR_EC_HVC] = handle_hvc,
541 [HSR_EC_SMC] = handle_smc,
542 [HSR_EC_IABT] = kvm_handle_guest_abort,
543 [HSR_EC_IABT_HYP] = handle_pabt_hyp,
544 [HSR_EC_DABT] = kvm_handle_guest_abort,
545 [HSR_EC_DABT_HYP] = handle_dabt_hyp,
549 * A conditional instruction is allowed to trap, even though it
550 * wouldn't be executed. So let's re-implement the hardware, in
553 static bool kvm_condition_valid(struct kvm_vcpu *vcpu)
555 unsigned long cpsr, cond, insn;
558 * Exception Code 0 can only happen if we set HCR.TGE to 1, to
559 * catch undefined instructions, and then we won't get past
560 * the arm_exit_handlers test anyway.
562 BUG_ON(((vcpu->arch.hsr & HSR_EC) >> HSR_EC_SHIFT) == 0);
564 /* Top two bits non-zero? Unconditional. */
565 if (vcpu->arch.hsr >> 30)
568 cpsr = *vcpu_cpsr(vcpu);
570 /* Is condition field valid? */
571 if ((vcpu->arch.hsr & HSR_CV) >> HSR_CV_SHIFT)
572 cond = (vcpu->arch.hsr & HSR_COND) >> HSR_COND_SHIFT;
574 /* This can happen in Thumb mode: examine IT state. */
577 it = ((cpsr >> 8) & 0xFC) | ((cpsr >> 25) & 0x3);
579 /* it == 0 => unconditional. */
583 /* The cond for this insn works out as the top 4 bits. */
587 /* Shift makes it look like an ARM-mode instruction */
589 return arm_check_condition(insn, cpsr) != ARM_OPCODE_CONDTEST_FAIL;
593 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
594 * proper exit to QEMU.
596 static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
599 unsigned long hsr_ec;
601 switch (exception_index) {
602 case ARM_EXCEPTION_IRQ:
604 case ARM_EXCEPTION_UNDEFINED:
605 kvm_err("Undefined exception in Hyp mode at: %#08x\n",
608 panic("KVM: Hypervisor undefined exception!\n");
609 case ARM_EXCEPTION_DATA_ABORT:
610 case ARM_EXCEPTION_PREF_ABORT:
611 case ARM_EXCEPTION_HVC:
612 hsr_ec = (vcpu->arch.hsr & HSR_EC) >> HSR_EC_SHIFT;
614 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers)
615 || !arm_exit_handlers[hsr_ec]) {
616 kvm_err("Unkown exception class: %#08lx, "
617 "hsr: %#08x\n", hsr_ec,
618 (unsigned int)vcpu->arch.hsr);
623 * See ARM ARM B1.14.1: "Hyp traps on instructions
624 * that fail their condition code check"
626 if (!kvm_condition_valid(vcpu)) {
627 bool is_wide = vcpu->arch.hsr & HSR_IL;
628 kvm_skip_instr(vcpu, is_wide);
632 return arm_exit_handlers[hsr_ec](vcpu, run);
634 kvm_pr_unimpl("Unsupported exception type: %d",
636 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
641 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
643 if (likely(vcpu->arch.has_run_once))
646 vcpu->arch.has_run_once = true;
649 * Initialize the VGIC before running a vcpu the first time on
652 if (irqchip_in_kernel(vcpu->kvm) &&
653 unlikely(!vgic_initialized(vcpu->kvm))) {
654 int ret = kvm_vgic_init(vcpu->kvm);
660 * Handle the "start in power-off" case by calling into the
663 if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) {
664 *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF;
671 static void vcpu_pause(struct kvm_vcpu *vcpu)
673 wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
675 wait_event_interruptible(*wq, !vcpu->arch.pause);
679 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
680 * @vcpu: The VCPU pointer
681 * @run: The kvm_run structure pointer used for userspace state exchange
683 * This function is called through the VCPU_RUN ioctl called from user space. It
684 * will execute VM code in a loop until the time slice for the process is used
685 * or some emulation is needed from user space in which case the function will
686 * return with return value 0 and with the kvm_run structure filled in with the
687 * required data for the requested emulation.
689 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
694 /* Make sure they initialize the vcpu with KVM_ARM_VCPU_INIT */
695 if (unlikely(vcpu->arch.target < 0))
698 ret = kvm_vcpu_first_run_init(vcpu);
702 if (run->exit_reason == KVM_EXIT_MMIO) {
703 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
708 if (vcpu->sigset_active)
709 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
712 run->exit_reason = KVM_EXIT_UNKNOWN;
715 * Check conditions before entering the guest
719 update_vttbr(vcpu->kvm);
721 if (vcpu->arch.pause)
724 kvm_vgic_flush_hwstate(vcpu);
725 kvm_timer_flush_hwstate(vcpu);
730 * Re-check atomic conditions
732 if (signal_pending(current)) {
734 run->exit_reason = KVM_EXIT_INTR;
737 if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
739 kvm_timer_sync_hwstate(vcpu);
740 kvm_vgic_sync_hwstate(vcpu);
744 /**************************************************************
747 trace_kvm_entry(*vcpu_pc(vcpu));
749 vcpu->mode = IN_GUEST_MODE;
751 ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
753 vcpu->mode = OUTSIDE_GUEST_MODE;
754 vcpu->arch.last_pcpu = smp_processor_id();
756 trace_kvm_exit(*vcpu_pc(vcpu));
758 * We may have taken a host interrupt in HYP mode (ie
759 * while executing the guest). This interrupt is still
760 * pending, as we haven't serviced it yet!
762 * We're now back in SVC mode, with interrupts
763 * disabled. Enabling the interrupts now will have
764 * the effect of taking the interrupt again, in SVC
771 *************************************************************/
773 kvm_timer_sync_hwstate(vcpu);
774 kvm_vgic_sync_hwstate(vcpu);
776 ret = handle_exit(vcpu, run, ret);
779 if (vcpu->sigset_active)
780 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
784 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
790 if (number == KVM_ARM_IRQ_CPU_IRQ)
791 bit_index = __ffs(HCR_VI);
792 else /* KVM_ARM_IRQ_CPU_FIQ */
793 bit_index = __ffs(HCR_VF);
795 ptr = (unsigned long *)&vcpu->arch.irq_lines;
797 set = test_and_set_bit(bit_index, ptr);
799 set = test_and_clear_bit(bit_index, ptr);
802 * If we didn't change anything, no need to wake up or kick other CPUs
808 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
809 * trigger a world-switch round on the running physical CPU to set the
810 * virtual IRQ/FIQ fields in the HCR appropriately.
817 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level)
819 u32 irq = irq_level->irq;
820 unsigned int irq_type, vcpu_idx, irq_num;
821 int nrcpus = atomic_read(&kvm->online_vcpus);
822 struct kvm_vcpu *vcpu = NULL;
823 bool level = irq_level->level;
825 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
826 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
827 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
829 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
832 case KVM_ARM_IRQ_TYPE_CPU:
833 if (irqchip_in_kernel(kvm))
836 if (vcpu_idx >= nrcpus)
839 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
843 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
846 return vcpu_interrupt_line(vcpu, irq_num, level);
847 case KVM_ARM_IRQ_TYPE_PPI:
848 if (!irqchip_in_kernel(kvm))
851 if (vcpu_idx >= nrcpus)
854 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
858 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
861 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
862 case KVM_ARM_IRQ_TYPE_SPI:
863 if (!irqchip_in_kernel(kvm))
866 if (irq_num < VGIC_NR_PRIVATE_IRQS ||
867 irq_num > KVM_ARM_IRQ_GIC_MAX)
870 return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
876 long kvm_arch_vcpu_ioctl(struct file *filp,
877 unsigned int ioctl, unsigned long arg)
879 struct kvm_vcpu *vcpu = filp->private_data;
880 void __user *argp = (void __user *)arg;
883 case KVM_ARM_VCPU_INIT: {
884 struct kvm_vcpu_init init;
886 if (copy_from_user(&init, argp, sizeof(init)))
889 return kvm_vcpu_set_target(vcpu, &init);
892 case KVM_SET_ONE_REG:
893 case KVM_GET_ONE_REG: {
894 struct kvm_one_reg reg;
895 if (copy_from_user(®, argp, sizeof(reg)))
897 if (ioctl == KVM_SET_ONE_REG)
898 return kvm_arm_set_reg(vcpu, ®);
900 return kvm_arm_get_reg(vcpu, ®);
902 case KVM_GET_REG_LIST: {
903 struct kvm_reg_list __user *user_list = argp;
904 struct kvm_reg_list reg_list;
907 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
910 reg_list.n = kvm_arm_num_regs(vcpu);
911 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
915 return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
922 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
927 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
928 struct kvm_arm_device_addr *dev_addr)
930 unsigned long dev_id, type;
932 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
933 KVM_ARM_DEVICE_ID_SHIFT;
934 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
935 KVM_ARM_DEVICE_TYPE_SHIFT;
938 case KVM_ARM_DEVICE_VGIC_V2:
941 return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
947 long kvm_arch_vm_ioctl(struct file *filp,
948 unsigned int ioctl, unsigned long arg)
950 struct kvm *kvm = filp->private_data;
951 void __user *argp = (void __user *)arg;
954 case KVM_CREATE_IRQCHIP: {
956 return kvm_vgic_create(kvm);
960 case KVM_ARM_SET_DEVICE_ADDR: {
961 struct kvm_arm_device_addr dev_addr;
963 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
965 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
972 static void cpu_init_hyp_mode(void *vector)
974 unsigned long long pgd_ptr;
975 unsigned long pgd_low, pgd_high;
976 unsigned long hyp_stack_ptr;
977 unsigned long stack_page;
978 unsigned long vector_ptr;
980 /* Switch from the HYP stub to our own HYP init vector */
981 __hyp_set_vectors((unsigned long)vector);
983 pgd_ptr = (unsigned long long)kvm_mmu_get_httbr();
984 pgd_low = (pgd_ptr & ((1ULL << 32) - 1));
985 pgd_high = (pgd_ptr >> 32ULL);
986 stack_page = __get_cpu_var(kvm_arm_hyp_stack_page);
987 hyp_stack_ptr = stack_page + PAGE_SIZE;
988 vector_ptr = (unsigned long)__kvm_hyp_vector;
991 * Call initialization code, and switch to the full blown
992 * HYP code. The init code doesn't need to preserve these registers as
993 * r1-r3 and r12 are already callee save according to the AAPCS.
994 * Note that we slightly misuse the prototype by casing the pgd_low to
997 kvm_call_hyp((void *)pgd_low, pgd_high, hyp_stack_ptr, vector_ptr);
1001 * Inits Hyp-mode on all online CPUs
1003 static int init_hyp_mode(void)
1005 phys_addr_t init_phys_addr;
1010 * Allocate Hyp PGD and setup Hyp identity mapping
1012 err = kvm_mmu_init();
1017 * It is probably enough to obtain the default on one
1018 * CPU. It's unlikely to be different on the others.
1020 hyp_default_vectors = __hyp_get_vectors();
1023 * Allocate stack pages for Hypervisor-mode
1025 for_each_possible_cpu(cpu) {
1026 unsigned long stack_page;
1028 stack_page = __get_free_page(GFP_KERNEL);
1031 goto out_free_stack_pages;
1034 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1038 * Execute the init code on each CPU.
1040 * Note: The stack is not mapped yet, so don't do anything else than
1041 * initializing the hypervisor mode on each CPU using a local stack
1042 * space for temporary storage.
1044 init_phys_addr = virt_to_phys(__kvm_hyp_init);
1045 for_each_online_cpu(cpu) {
1046 smp_call_function_single(cpu, cpu_init_hyp_mode,
1047 (void *)(long)init_phys_addr, 1);
1051 * Unmap the identity mapping
1053 kvm_clear_hyp_idmap();
1056 * Map the Hyp-code called directly from the host
1058 err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
1060 kvm_err("Cannot map world-switch code\n");
1061 goto out_free_mappings;
1065 * Map the Hyp stack pages
1067 for_each_possible_cpu(cpu) {
1068 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1069 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
1072 kvm_err("Cannot map hyp stack\n");
1073 goto out_free_mappings;
1078 * Map the host VFP structures
1080 kvm_host_vfp_state = alloc_percpu(struct vfp_hard_struct);
1081 if (!kvm_host_vfp_state) {
1083 kvm_err("Cannot allocate host VFP state\n");
1084 goto out_free_mappings;
1087 for_each_possible_cpu(cpu) {
1088 struct vfp_hard_struct *vfp;
1090 vfp = per_cpu_ptr(kvm_host_vfp_state, cpu);
1091 err = create_hyp_mappings(vfp, vfp + 1);
1094 kvm_err("Cannot map host VFP state: %d\n", err);
1100 * Init HYP view of VGIC
1102 err = kvm_vgic_hyp_init();
1106 #ifdef CONFIG_KVM_ARM_VGIC
1107 vgic_present = true;
1111 * Init HYP architected timer support
1113 err = kvm_timer_hyp_init();
1115 goto out_free_mappings;
1117 kvm_info("Hyp mode initialized successfully\n");
1120 free_percpu(kvm_host_vfp_state);
1123 out_free_stack_pages:
1124 for_each_possible_cpu(cpu)
1125 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1127 kvm_err("error initializing Hyp mode: %d\n", err);
1132 * Initialize Hyp-mode and memory mappings on all CPUs.
1134 int kvm_arch_init(void *opaque)
1138 if (!is_hyp_mode_available()) {
1139 kvm_err("HYP mode not available\n");
1143 if (kvm_target_cpu() < 0) {
1144 kvm_err("Target CPU not supported!\n");
1148 err = init_hyp_mode();
1152 kvm_coproc_table_init();
1158 /* NOP: Compiling as a module not supported */
1159 void kvm_arch_exit(void)
1163 static int arm_init(void)
1165 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1169 module_init(arm_init);