in kvm/x86.c [6161:6461]
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;
int r = -ENOTTY;
/*
* This union makes it completely explicit to gcc-3.x
* that these two variables' stack usage should be
* combined, not added together.
*/
union {
struct kvm_pit_state ps;
struct kvm_pit_state2 ps2;
struct kvm_pit_config pit_config;
} u;
switch (ioctl) {
case KVM_SET_TSS_ADDR:
r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
break;
case KVM_SET_IDENTITY_MAP_ADDR: {
u64 ident_addr;
mutex_lock(&kvm->lock);
r = -EINVAL;
if (kvm->created_vcpus)
goto set_identity_unlock;
r = -EFAULT;
if (copy_from_user(&ident_addr, argp, sizeof(ident_addr)))
goto set_identity_unlock;
r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
set_identity_unlock:
mutex_unlock(&kvm->lock);
break;
}
case KVM_SET_NR_MMU_PAGES:
r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
break;
case KVM_GET_NR_MMU_PAGES:
r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
break;
case KVM_CREATE_IRQCHIP: {
mutex_lock(&kvm->lock);
r = -EEXIST;
if (irqchip_in_kernel(kvm))
goto create_irqchip_unlock;
r = -EINVAL;
if (kvm->created_vcpus)
goto create_irqchip_unlock;
r = kvm_pic_init(kvm);
if (r)
goto create_irqchip_unlock;
r = kvm_ioapic_init(kvm);
if (r) {
kvm_pic_destroy(kvm);
goto create_irqchip_unlock;
}
r = kvm_setup_default_irq_routing(kvm);
if (r) {
kvm_ioapic_destroy(kvm);
kvm_pic_destroy(kvm);
goto create_irqchip_unlock;
}
/* Write kvm->irq_routing before enabling irqchip_in_kernel. */
smp_wmb();
kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
kvm_request_apicv_update(kvm, true, APICV_INHIBIT_REASON_ABSENT);
create_irqchip_unlock:
mutex_unlock(&kvm->lock);
break;
}
case KVM_CREATE_PIT:
u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
goto create_pit;
case KVM_CREATE_PIT2:
r = -EFAULT;
if (copy_from_user(&u.pit_config, argp,
sizeof(struct kvm_pit_config)))
goto out;
create_pit:
mutex_lock(&kvm->lock);
r = -EEXIST;
if (kvm->arch.vpit)
goto create_pit_unlock;
r = -ENOMEM;
kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
if (kvm->arch.vpit)
r = 0;
create_pit_unlock:
mutex_unlock(&kvm->lock);
break;
case KVM_GET_IRQCHIP: {
/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
struct kvm_irqchip *chip;
chip = memdup_user(argp, sizeof(*chip));
if (IS_ERR(chip)) {
r = PTR_ERR(chip);
goto out;
}
r = -ENXIO;
if (!irqchip_kernel(kvm))
goto get_irqchip_out;
r = kvm_vm_ioctl_get_irqchip(kvm, chip);
if (r)
goto get_irqchip_out;
r = -EFAULT;
if (copy_to_user(argp, chip, sizeof(*chip)))
goto get_irqchip_out;
r = 0;
get_irqchip_out:
kfree(chip);
break;
}
case KVM_SET_IRQCHIP: {
/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
struct kvm_irqchip *chip;
chip = memdup_user(argp, sizeof(*chip));
if (IS_ERR(chip)) {
r = PTR_ERR(chip);
goto out;
}
r = -ENXIO;
if (!irqchip_kernel(kvm))
goto set_irqchip_out;
r = kvm_vm_ioctl_set_irqchip(kvm, chip);
set_irqchip_out:
kfree(chip);
break;
}
case KVM_GET_PIT: {
r = -EFAULT;
if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
goto out;
r = 0;
break;
}
case KVM_SET_PIT: {
r = -EFAULT;
if (copy_from_user(&u.ps, argp, sizeof(u.ps)))
goto out;
mutex_lock(&kvm->lock);
r = -ENXIO;
if (!kvm->arch.vpit)
goto set_pit_out;
r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
set_pit_out:
mutex_unlock(&kvm->lock);
break;
}
case KVM_GET_PIT2: {
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
goto out;
r = 0;
break;
}
case KVM_SET_PIT2: {
r = -EFAULT;
if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
goto out;
mutex_lock(&kvm->lock);
r = -ENXIO;
if (!kvm->arch.vpit)
goto set_pit2_out;
r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
set_pit2_out:
mutex_unlock(&kvm->lock);
break;
}
case KVM_REINJECT_CONTROL: {
struct kvm_reinject_control control;
r = -EFAULT;
if (copy_from_user(&control, argp, sizeof(control)))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_reinject(kvm, &control);
break;
}
case KVM_SET_BOOT_CPU_ID:
r = 0;
mutex_lock(&kvm->lock);
if (kvm->created_vcpus)
r = -EBUSY;
else
kvm->arch.bsp_vcpu_id = arg;
mutex_unlock(&kvm->lock);
break;
#ifdef CONFIG_KVM_XEN
case KVM_XEN_HVM_CONFIG: {
struct kvm_xen_hvm_config xhc;
r = -EFAULT;
if (copy_from_user(&xhc, argp, sizeof(xhc)))
goto out;
r = kvm_xen_hvm_config(kvm, &xhc);
break;
}
case KVM_XEN_HVM_GET_ATTR: {
struct kvm_xen_hvm_attr xha;
r = -EFAULT;
if (copy_from_user(&xha, argp, sizeof(xha)))
goto out;
r = kvm_xen_hvm_get_attr(kvm, &xha);
if (!r && copy_to_user(argp, &xha, sizeof(xha)))
r = -EFAULT;
break;
}
case KVM_XEN_HVM_SET_ATTR: {
struct kvm_xen_hvm_attr xha;
r = -EFAULT;
if (copy_from_user(&xha, argp, sizeof(xha)))
goto out;
r = kvm_xen_hvm_set_attr(kvm, &xha);
break;
}
#endif
case KVM_SET_CLOCK:
r = kvm_vm_ioctl_set_clock(kvm, argp);
break;
case KVM_GET_CLOCK:
r = kvm_vm_ioctl_get_clock(kvm, argp);
break;
case KVM_MEMORY_ENCRYPT_OP: {
r = -ENOTTY;
if (kvm_x86_ops.mem_enc_op)
r = static_call(kvm_x86_mem_enc_op)(kvm, argp);
break;
}
case KVM_MEMORY_ENCRYPT_REG_REGION: {
struct kvm_enc_region region;
r = -EFAULT;
if (copy_from_user(®ion, argp, sizeof(region)))
goto out;
r = -ENOTTY;
if (kvm_x86_ops.mem_enc_reg_region)
r = static_call(kvm_x86_mem_enc_reg_region)(kvm, ®ion);
break;
}
case KVM_MEMORY_ENCRYPT_UNREG_REGION: {
struct kvm_enc_region region;
r = -EFAULT;
if (copy_from_user(®ion, argp, sizeof(region)))
goto out;
r = -ENOTTY;
if (kvm_x86_ops.mem_enc_unreg_region)
r = static_call(kvm_x86_mem_enc_unreg_region)(kvm, ®ion);
break;
}
case KVM_HYPERV_EVENTFD: {
struct kvm_hyperv_eventfd hvevfd;
r = -EFAULT;
if (copy_from_user(&hvevfd, argp, sizeof(hvevfd)))
goto out;
r = kvm_vm_ioctl_hv_eventfd(kvm, &hvevfd);
break;
}
case KVM_SET_PMU_EVENT_FILTER:
r = kvm_vm_ioctl_set_pmu_event_filter(kvm, argp);
break;
case KVM_X86_SET_MSR_FILTER:
r = kvm_vm_ioctl_set_msr_filter(kvm, argp);
break;
default:
r = -ENOTTY;
}
out:
return r;
}