diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2017-05-09 12:51:49 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-05-09 12:51:49 +0200 |
commit | 36c344f3f1ffc0b1b20abd237b7401dc6687ee8f (patch) | |
tree | 24b330a2e62bfc8f576cccdc833b53e1f1b69050 /virt | |
parent | 03efce6f935f89f90a98997ceea514aeff47b6dc (diff) | |
parent | a2b19e6e2d4bb662a64799541c144fd94f8fb024 (diff) |
Merge tag 'kvm-arm-for-v4.12-round2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
Second round of KVM/ARM Changes for v4.12.
Changes include:
- A fix related to the 32-bit idmap stub
- A fix to the bitmask used to deode the operands of an AArch32 CP
instruction
- We have moved the files shared between arch/arm/kvm and
arch/arm64/kvm to virt/kvm/arm
- We add support for saving/restoring the virtual ITS state to
userspace
Diffstat (limited to 'virt')
-rw-r--r-- | virt/kvm/arm/arm.c | 1480 | ||||
-rw-r--r-- | virt/kvm/arm/mmio.c | 217 | ||||
-rw-r--r-- | virt/kvm/arm/mmu.c | 1975 | ||||
-rw-r--r-- | virt/kvm/arm/perf.c | 68 | ||||
-rw-r--r-- | virt/kvm/arm/psci.c | 332 | ||||
-rw-r--r-- | virt/kvm/arm/trace.h | 246 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/trace.h | 37 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-init.c | 25 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-its.c | 1234 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-kvm-device.c | 53 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio-v3.c | 147 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.c | 11 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.h | 14 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-v3.c | 128 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic.c | 2 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic.h | 33 |
16 files changed, 5725 insertions, 277 deletions
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c new file mode 100644 index 000000000000..3417e184c8e1 --- /dev/null +++ b/virt/kvm/arm/arm.c @@ -0,0 +1,1480 @@ +/* + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall <c.dall@virtualopensystems.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include <linux/cpu_pm.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/kvm_host.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <linux/mman.h> +#include <linux/sched.h> +#include <linux/kvm.h> +#include <trace/events/kvm.h> +#include <kvm/arm_pmu.h> + +#define CREATE_TRACE_POINTS +#include "trace.h" + +#include <linux/uaccess.h> +#include <asm/ptrace.h> +#include <asm/mman.h> +#include <asm/tlbflush.h> +#include <asm/cacheflush.h> +#include <asm/virt.h> +#include <asm/kvm_arm.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_mmu.h> +#include <asm/kvm_emulate.h> +#include <asm/kvm_coproc.h> +#include <asm/kvm_psci.h> +#include <asm/sections.h> + +#ifdef REQUIRES_VIRT +__asm__(".arch_extension virt"); +#endif + +static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); +static kvm_cpu_context_t __percpu *kvm_host_cpu_state; + +/* Per-CPU variable containing the currently running vcpu. */ +static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); + +/* The VMID used in the VTTBR */ +static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); +static u32 kvm_next_vmid; +static unsigned int kvm_vmid_bits __read_mostly; +static DEFINE_SPINLOCK(kvm_vmid_lock); + +static bool vgic_present; + +static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); + +static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) +{ + BUG_ON(preemptible()); + __this_cpu_write(kvm_arm_running_vcpu, vcpu); +} + +/** + * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. + * Must be called from non-preemptible context + */ +struct kvm_vcpu *kvm_arm_get_running_vcpu(void) +{ + BUG_ON(preemptible()); + return __this_cpu_read(kvm_arm_running_vcpu); +} + +/** + * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. + */ +struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) +{ + return &kvm_arm_running_vcpu; +} + +int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) +{ + return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; +} + +int kvm_arch_hardware_setup(void) +{ + return 0; +} + +void kvm_arch_check_processor_compat(void *rtn) +{ + *(int *)rtn = 0; +} + + +/** + * kvm_arch_init_vm - initializes a VM data structure + * @kvm: pointer to the KVM struct + */ +int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) +{ + int ret, cpu; + + if (type) + return -EINVAL; + + kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran)); + if (!kvm->arch.last_vcpu_ran) + return -ENOMEM; + + for_each_possible_cpu(cpu) + *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1; + + ret = kvm_alloc_stage2_pgd(kvm); + if (ret) + goto out_fail_alloc; + + ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP); + if (ret) + goto out_free_stage2_pgd; + + kvm_vgic_early_init(kvm); + + /* Mark the initial VMID generation invalid */ + kvm->arch.vmid_gen = 0; + + /* The maximum number of VCPUs is limited by the host's GIC model */ + kvm->arch.max_vcpus = vgic_present ? + kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS; + + return ret; +out_free_stage2_pgd: + kvm_free_stage2_pgd(kvm); +out_fail_alloc: + free_percpu(kvm->arch.last_vcpu_ran); + kvm->arch.last_vcpu_ran = NULL; + return ret; +} + +bool kvm_arch_has_vcpu_debugfs(void) +{ + return false; +} + +int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) +{ + return 0; +} + +int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) +{ + return VM_FAULT_SIGBUS; +} + + +/** + * kvm_arch_destroy_vm - destroy the VM data structure + * @kvm: pointer to the KVM struct + */ +void kvm_arch_destroy_vm(struct kvm *kvm) +{ + int i; + + free_percpu(kvm->arch.last_vcpu_ran); + kvm->arch.last_vcpu_ran = NULL; + + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + if (kvm->vcpus[i]) { + kvm_arch_vcpu_free(kvm->vcpus[i]); + kvm->vcpus[i] = NULL; + } + } + + kvm_vgic_destroy(kvm); +} + +int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) +{ + int r; + switch (ext) { + case KVM_CAP_IRQCHIP: + r = vgic_present; + break; + case KVM_CAP_IOEVENTFD: + case KVM_CAP_DEVICE_CTRL: + case KVM_CAP_USER_MEMORY: + case KVM_CAP_SYNC_MMU: + case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: + case KVM_CAP_ONE_REG: + case KVM_CAP_ARM_PSCI: + case KVM_CAP_ARM_PSCI_0_2: + case KVM_CAP_READONLY_MEM: + case KVM_CAP_MP_STATE: + case KVM_CAP_IMMEDIATE_EXIT: + r = 1; + break; + case KVM_CAP_ARM_SET_DEVICE_ADDR: + r = 1; + break; + case KVM_CAP_NR_VCPUS: + r = num_online_cpus(); + break; + case KVM_CAP_MAX_VCPUS: + r = KVM_MAX_VCPUS; + break; + case KVM_CAP_NR_MEMSLOTS: + r = KVM_USER_MEM_SLOTS; + break; + case KVM_CAP_MSI_DEVID: + if (!kvm) + r = -EINVAL; + else + r = kvm->arch.vgic.msis_require_devid; + break; + case KVM_CAP_ARM_USER_IRQ: + /* + * 1: EL1_VTIMER, EL1_PTIMER, and PMU. + * (bump this number if adding more devices) + */ + r = 1; + break; + default: + r = kvm_arch_dev_ioctl_check_extension(kvm, ext); + break; + } + return r; +} + +long kvm_arch_dev_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + return -EINVAL; +} + + +struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) +{ + int err; + struct kvm_vcpu *vcpu; + + if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) { + err = -EBUSY; + goto out; + } + + if (id >= kvm->arch.max_vcpus) { + err = -EINVAL; + goto out; + } + + vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); + if (!vcpu) { + err = -ENOMEM; + goto out; + } + + err = kvm_vcpu_init(vcpu, kvm, id); + if (err) + goto free_vcpu; + + err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP); + if (err) + goto vcpu_uninit; + + return vcpu; +vcpu_uninit: + kvm_vcpu_uninit(vcpu); +free_vcpu: + kmem_cache_free(kvm_vcpu_cache, vcpu); +out: + return ERR_PTR(err); +} + +void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) +{ + kvm_vgic_vcpu_early_init(vcpu); +} + +void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) +{ + kvm_mmu_free_memory_caches(vcpu); + kvm_timer_vcpu_terminate(vcpu); + kvm_vgic_vcpu_destroy(vcpu); + kvm_pmu_vcpu_destroy(vcpu); + kvm_vcpu_uninit(vcpu); + kmem_cache_free(kvm_vcpu_cache, vcpu); +} + +void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) +{ + kvm_arch_vcpu_free(vcpu); +} + +int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) +{ + return kvm_timer_should_fire(vcpu_vtimer(vcpu)) || + kvm_timer_should_fire(vcpu_ptimer(vcpu)); +} + +void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_schedule(vcpu); +} + +void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) +{ + kvm_timer_unschedule(vcpu); +} + +int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) +{ + /* Force users to call KVM_ARM_VCPU_INIT */ + vcpu->arch.target = -1; + bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); + + /* Set up the timer */ + kvm_timer_vcpu_init(vcpu); + + kvm_arm_reset_debug_ptr(vcpu); + + return kvm_vgic_vcpu_init(vcpu); +} + +void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) +{ + int *last_ran; + + last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran); + + /* + * We might get preempted before the vCPU actually runs, but + * over-invalidation doesn't affect correctness. + */ + if (*last_ran != vcpu->vcpu_id) { + kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu); + *last_ran = vcpu->vcpu_id; + } + + vcpu->cpu = cpu; + vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); + + kvm_arm_set_running_vcpu(vcpu); + + kvm_vgic_load(vcpu); +} + +void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) +{ + kvm_vgic_put(vcpu); + + vcpu->cpu = -1; + + kvm_arm_set_running_vcpu(NULL); + kvm_timer_vcpu_put(vcpu); +} + +int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + if (vcpu->arch.power_off) + mp_state->mp_state = KVM_MP_STATE_STOPPED; + else + mp_state->mp_state = KVM_MP_STATE_RUNNABLE; + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, + struct kvm_mp_state *mp_state) +{ + switch (mp_state->mp_state) { + case KVM_MP_STATE_RUNNABLE: + vcpu->arch.power_off = false; + break; + case KVM_MP_STATE_STOPPED: + vcpu->arch.power_off = true; + break; + default: + return -EINVAL; + } + + return 0; +} + +/** + * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled + * @v: The VCPU pointer + * + * If the guest CPU is not waiting for interrupts or an interrupt line is + * asserted, the CPU is by definition runnable. + */ +int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) +{ + return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) + && !v->arch.power_off && !v->arch.pause); +} + +/* Just ensure a guest exit from a particular CPU */ +static void exit_vm_noop(void *info) +{ +} + +void force_vm_exit(const cpumask_t *mask) +{ + preempt_disable(); + smp_call_function_many(mask, exit_vm_noop, NULL, true); + preempt_enable(); +} + +/** + * need_new_vmid_gen - check that the VMID is still valid + * @kvm: The VM's VMID to check + * + * return true if there is a new generation of VMIDs being used + * + * The hardware supports only 256 values with the value zero reserved for the + * host, so we check if an assigned value belongs to a previous generation, + * which which requires us to assign a new value. If we're the first to use a + * VMID for the new generation, we must flush necessary caches and TLBs on all + * CPUs. + */ +static bool need_new_vmid_gen(struct kvm *kvm) +{ + return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); +} + +/** + * update_vttbr - Update the VTTBR with a valid VMID before the guest runs + * @kvm The guest that we are about to run + * + * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the + * VM has a valid VMID, otherwise assigns a new one and flushes corresponding + * caches and TLBs. + */ +static void update_vttbr(struct kvm *kvm) +{ + phys_addr_t pgd_phys; + u64 vmid; + + if (!need_new_vmid_gen(kvm)) + return; + + spin_lock(&kvm_vmid_lock); + + /* + * We need to re-check the vmid_gen here to ensure that if another vcpu + * already allocated a valid vmid for this vm, then this vcpu should + * use the same vmid. + */ + if (!need_new_vmid_gen(kvm)) { + spin_unlock(&kvm_vmid_lock); + return; + } + + /* First user of a new VMID generation? */ + if (unlikely(kvm_next_vmid == 0)) { + atomic64_inc(&kvm_vmid_gen); + kvm_next_vmid = 1; + + /* + * On SMP we know no other CPUs can use this CPU's or each + * other's VMID after force_vm_exit returns since the + * kvm_vmid_lock blocks them from reentry to the guest. + */ + force_vm_exit(cpu_all_mask); + /* + * Now broadcast TLB + ICACHE invalidation over the inner + * shareable domain to make sure all data structures are + * clean. + */ + kvm_call_hyp(__kvm_flush_vm_context); + } + + kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); + kvm->arch.vmid = kvm_next_vmid; + kvm_next_vmid++; + kvm_next_vmid &= (1 << kvm_vmid_bits) - 1; + + /* update vttbr to be used with the new vmid */ + pgd_phys = virt_to_phys(kvm->arch.pgd); + BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK); + vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits); + kvm->arch.vttbr = pgd_phys | vmid; + + spin_unlock(&kvm_vmid_lock); +} + +static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + int ret = 0; + + if (likely(vcpu->arch.has_run_once)) + return 0; + + vcpu->arch.has_run_once = true; + + /* + * Map the VGIC hardware resources before running a vcpu the first + * time on this VM. + */ + if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { + ret = kvm_vgic_map_resources(kvm); + if (ret) + return ret; + } + + ret = kvm_timer_enable(vcpu); + + return ret; +} + +bool kvm_arch_intc_initialized(struct kvm *kvm) +{ + return vgic_initialized(kvm); +} + +void kvm_arm_halt_guest(struct kvm *kvm) +{ + int i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) + vcpu->arch.pause = true; + kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT); +} + +void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu) +{ + vcpu->arch.pause = true; + kvm_vcpu_kick(vcpu); +} + +void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu) +{ + struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); + + vcpu->arch.pause = false; + swake_up(wq); +} + +void kvm_arm_resume_guest(struct kvm *kvm) +{ + int i; + struct kvm_vcpu *vcpu; + + kvm_for_each_vcpu(i, vcpu, kvm) + kvm_arm_resume_vcpu(vcpu); +} + +static void vcpu_sleep(struct kvm_vcpu *vcpu) +{ + struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); + + swait_event_interruptible(*wq, ((!vcpu->arch.power_off) && + (!vcpu->arch.pause))); +} + +static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.target >= 0; +} + +/** + * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code + * @vcpu: The VCPU pointer + * @run: The kvm_run structure pointer used for userspace state exchange + * + * This function is called through the VCPU_RUN ioctl called from user space. It + * will execute VM code in a loop until the time slice for the process is used + * or some emulation is needed from user space in which case the function will + * return with return value 0 and with the kvm_run structure filled in with the + * required data for the requested emulation. + */ +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + int ret; + sigset_t sigsaved; + + if (unlikely(!kvm_vcpu_initialized(vcpu))) + return -ENOEXEC; + + ret = kvm_vcpu_first_run_init(vcpu); + if (ret) + return ret; + + if (run->exit_reason == KVM_EXIT_MMIO) { + ret = kvm_handle_mmio_return(vcpu, vcpu->run); + if (ret) + return ret; + } + + if (run->immediate_exit) + return -EINTR; + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); + + ret = 1; + run->exit_reason = KVM_EXIT_UNKNOWN; + while (ret > 0) { + /* + * Check conditions before entering the guest + */ + cond_resched(); + + update_vttbr(vcpu->kvm); + + if (vcpu->arch.power_off || vcpu->arch.pause) + vcpu_sleep(vcpu); + + /* + * Preparing the interrupts to be injected also + * involves poking the GIC, which must be done in a + * non-preemptible context. + */ + preempt_disable(); + + kvm_pmu_flush_hwstate(vcpu); + + kvm_timer_flush_hwstate(vcpu); + kvm_vgic_flush_hwstate(vcpu); + + local_irq_disable(); + + /* + * If we have a singal pending, or need to notify a userspace + * irqchip about timer or PMU level changes, then we exit (and + * update the timer level state in kvm_timer_update_run + * below). + */ + if (signal_pending(current) || + kvm_timer_should_notify_user(vcpu) || + kvm_pmu_should_notify_user(vcpu)) { + ret = -EINTR; + run->exit_reason = KVM_EXIT_INTR; + } + + if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || + vcpu->arch.power_off || vcpu->arch.pause) { + local_irq_enable(); + kvm_pmu_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); + kvm_vgic_sync_hwstate(vcpu); + preempt_enable(); + continue; + } + + kvm_arm_setup_debug(vcpu); + + /************************************************************** + * Enter the guest + */ + trace_kvm_entry(*vcpu_pc(vcpu)); + guest_enter_irqoff(); + vcpu->mode = IN_GUEST_MODE; + + ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); + + vcpu->mode = OUTSIDE_GUEST_MODE; + vcpu->stat.exits++; + /* + * Back from guest + *************************************************************/ + + kvm_arm_clear_debug(vcpu); + + /* + * We may have taken a host interrupt in HYP mode (ie + * while executing the guest). This interrupt is still + * pending, as we haven't serviced it yet! + * + * We're now back in SVC mode, with interrupts + * disabled. Enabling the interrupts now will have + * the effect of taking the interrupt again, in SVC + * mode this time. + */ + local_irq_enable(); + + /* + * We do local_irq_enable() before calling guest_exit() so + * that if a timer interrupt hits while running the guest we + * account that tick as being spent in the guest. We enable + * preemption after calling guest_exit() so that if we get + * preempted we make sure ticks after that is not counted as + * guest time. + */ + guest_exit(); + trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); + + /* + * We must sync the PMU and timer state before the vgic state so + * that the vgic can properly sample the updated state of the + * interrupt line. + */ + kvm_pmu_sync_hwstate(vcpu); + kvm_timer_sync_hwstate(vcpu); + + kvm_vgic_sync_hwstate(vcpu); + + preempt_enable(); + + ret = handle_exit(vcpu, run, ret); + } + + /* Tell userspace about in-kernel device output levels */ + if (unlikely(!irqchip_in_kernel(vcpu->kvm))) { + kvm_timer_update_run(vcpu); + kvm_pmu_update_run(vcpu); + } + + if (vcpu->sigset_active) + sigprocmask(SIG_SETMASK, &sigsaved, NULL); + return ret; +} + +static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) +{ + int bit_index; + bool set; + unsigned long *ptr; + + if (number == KVM_ARM_IRQ_CPU_IRQ) + bit_index = __ffs(HCR_VI); + else /* KVM_ARM_IRQ_CPU_FIQ */ + bit_index = __ffs(HCR_VF); + + ptr = (unsigned long *)&vcpu->arch.irq_lines; + if (level) + set = test_and_set_bit(bit_index, ptr); + else + set = test_and_clear_bit(bit_index, ptr); + + /* + * If we didn't change anything, no need to wake up or kick other CPUs + */ + if (set == level) + return 0; + + /* + * The vcpu irq_lines field was updated, wake up sleeping VCPUs and + * trigger a world-switch round on the running physical CPU to set the + * virtual IRQ/FIQ fields in the HCR appropriately. + */ + kvm_vcpu_kick(vcpu); + + return 0; +} + +int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, + bool line_status) +{ + u32 irq = irq_level->irq; + unsigned int irq_type, vcpu_idx, irq_num; + int nrcpus = atomic_read(&kvm->online_vcpus); + struct kvm_vcpu *vcpu = NULL; + bool level = irq_level->level; + + irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; + vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; + irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; + + trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); + + switch (irq_type) { + case KVM_ARM_IRQ_TYPE_CPU: + if (irqchip_in_kernel(kvm)) + return -ENXIO; + + if (vcpu_idx >= nrcpus) + return -EINVAL; + + vcpu = kvm_get_vcpu(kvm, vcpu_idx); + if (!vcpu) + return -EINVAL; + + if (irq_num > KVM_ARM_IRQ_CPU_FIQ) + return -EINVAL; + + return vcpu_interrupt_line(vcpu, irq_num, level); + case KVM_ARM_IRQ_TYPE_PPI: + if (!irqchip_in_kernel(kvm)) + return -ENXIO; + + if (vcpu_idx >= nrcpus) + return -EINVAL; + + vcpu = kvm_get_vcpu(kvm, vcpu_idx); + if (!vcpu) + return -EINVAL; + + if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) + return -EINVAL; + + return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); + case KVM_ARM_IRQ_TYPE_SPI: + if (!irqchip_in_kernel(kvm)) + return -ENXIO; + + if (irq_num < VGIC_NR_PRIVATE_IRQS) + return -EINVAL; + + return kvm_vgic_inject_irq(kvm, 0, irq_num, level); + } + + return -EINVAL; +} + +static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, + const struct kvm_vcpu_init *init) +{ + unsigned int i; + int phys_target = kvm_target_cpu(); + + if (init->target != phys_target) + return -EINVAL; + + /* + * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must + * use the same target. + */ + if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) + return -EINVAL; + + /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ + for (i = 0; i < sizeof(init->features) * 8; i++) { + bool set = (init->features[i / 32] & (1 << (i % 32))); + + if (set && i >= KVM_VCPU_MAX_FEATURES) + return -ENOENT; + + /* + * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must + * use the same feature set. + */ + if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && + test_bit(i, vcpu->arch.features) != set) + return -EINVAL; + + if (set) + set_bit(i, vcpu->arch.features); + } + + vcpu->arch.target = phys_target; + + /* Now we know what it is, we can reset it. */ + return kvm_reset_vcpu(vcpu); +} + + +static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, + struct kvm_vcpu_init *init) +{ + int ret; + + ret = kvm_vcpu_set_target(vcpu, init); + if (ret) + return ret; + + /* + * Ensure a rebooted VM will fault in RAM pages and detect if the + * guest MMU is turned off and flush the caches as needed. + */ + if (vcpu->arch.has_run_once) + stage2_unmap_vm(vcpu->kvm); + + vcpu_reset_hcr(vcpu); + + /* + * Handle the "start in power-off" case. + */ + if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) + vcpu->arch.power_off = true; + else + vcpu->arch.power_off = false; + + return 0; +} + +static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr); + break; + } + + return ret; +} + +static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr); + break; + } + + return ret; +} + +static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu, + struct kvm_device_attr *attr) +{ + int ret = -ENXIO; + + switch (attr->group) { + default: + ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr); + break; + } + + return ret; +} + +long kvm_arch_vcpu_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu = filp->private_data; + void __user *argp = (void __user *)arg; + struct kvm_device_attr attr; + + switch (ioctl) { + case KVM_ARM_VCPU_INIT: { + struct kvm_vcpu_init init; + + if (copy_from_user(&init, argp, sizeof(init))) + return -EFAULT; + + return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); + } + case KVM_SET_ONE_REG: + case KVM_GET_ONE_REG: { + struct kvm_one_reg reg; + + if (unlikely(!kvm_vcpu_initialized(vcpu))) + return -ENOEXEC; + + if (copy_from_user(®, argp, sizeof(reg))) + return -EFAULT; + if (ioctl == KVM_SET_ONE_REG) + return kvm_arm_set_reg(vcpu, ®); + else + return kvm_arm_get_reg(vcpu, ®); + } + case KVM_GET_REG_LIST: { + struct kvm_reg_list __user *user_list = argp; + struct kvm_reg_list reg_list; + unsigned n; + + if (unlikely(!kvm_vcpu_initialized(vcpu))) + return -ENOEXEC; + + if (copy_from_user(®_list, user_list, sizeof(reg_list))) + return -EFAULT; + n = reg_list.n; + reg_list.n = kvm_arm_num_regs(vcpu); + if (copy_to_user(user_list, ®_list, sizeof(reg_list))) + return -EFAULT; + if (n < reg_list.n) + return -E2BIG; + return kvm_arm_copy_reg_indices(vcpu, user_list->reg); + } + case KVM_SET_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_set_attr(vcpu, &attr); + } + case KVM_GET_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_get_attr(vcpu, &attr); + } + case KVM_HAS_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + return kvm_arm_vcpu_has_attr(vcpu, &attr); + } + default: + return -EINVAL; + } +} + +/** + * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot + * @kvm: kvm instance + * @log: slot id and address to which we copy the log + * + * Steps 1-4 below provide general overview of dirty page logging. See + * kvm_get_dirty_log_protect() function description for additional details. + * + * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we + * always flush the TLB (step 4) even if previous step failed and the dirty + * bitmap may be corrupt. Regardless of previous outcome the KVM logging API + * does not preclude user space subsequent dirty log read. Flushing TLB ensures + * writes will be marked dirty for next log read. + * + * 1. Take a snapshot of the bit and clear it if needed. + * 2. Write protect the corresponding page. + * 3. Copy the snapshot to the userspace. + * 4. Flush TLB's if needed. + */ +int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) +{ + bool is_dirty = false; + int r; + + mutex_lock(&kvm->slots_lock); + + r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); + + if (is_dirty) + kvm_flush_remote_tlbs(kvm); + + mutex_unlock(&kvm->slots_lock); + return r; +} + +static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, + struct kvm_arm_device_addr *dev_addr) +{ + unsigned long dev_id, type; + + dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> + KVM_ARM_DEVICE_ID_SHIFT; + type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> + KVM_ARM_DEVICE_TYPE_SHIFT; + + switch (dev_id) { + case KVM_ARM_DEVICE_VGIC_V2: + if (!vgic_present) + return -ENXIO; + return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); + default: + return -ENODEV; + } +} + +long kvm_arch_vm_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm *kvm = filp->private_data; + void __user *argp = (void __user *)arg; + + switch (ioctl) { + case KVM_CREATE_IRQCHIP: { + int ret; + if (!vgic_present) + return -ENXIO; + mutex_lock(&kvm->lock); + ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); + mutex_unlock(&kvm->lock); + return ret; + } + case KVM_ARM_SET_DEVICE_ADDR: { + struct kvm_arm_device_addr dev_addr; + + if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) + return -EFAULT; + return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); + } + case KVM_ARM_PREFERRED_TARGET: { + int err; + struct kvm_vcpu_init init; + + err = kvm_vcpu_preferred_target(&init); + if (err) + return err; + + if (copy_to_user(argp, &init, sizeof(init))) + return |