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KVM: device: add simple registration mechanism for kvm_device_ops

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kvm_ioctl_create_device currently has knowledge of all the device types
and their associated ops. This is fairly inflexible when adding support
for new in-kernel device emulations, so move what we currently have out
into a table, which can support dynamic registration of ops by new
drivers for virtual hardware.

Cc: Alex Williamson <[email protected]>
Cc: Alex Graf <[email protected]>
Cc: Gleb Natapov <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Marc Zyngier <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Will Deacon 2014-09-02 10:27:33 +01:00 • committed by Paolo Bonzini
commit d60eacb070
3 changed files with 55 additions and 33 deletions
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69
virt/kvm/kvm_main.c
View file

@ -2272,6 +2272,41 @@ struct kvm_device *kvm_device_from_filp(struct file *filp)
return filp->private_data;
}
static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
#ifdef CONFIG_KVM_MPIC
[KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
[KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
#endif
#ifdef CONFIG_KVM_XICS
[KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
#endif
#ifdef CONFIG_KVM_VFIO
[KVM_DEV_TYPE_VFIO] = &kvm_vfio_ops,
#endif
#ifdef CONFIG_KVM_ARM_VGIC
[KVM_DEV_TYPE_ARM_VGIC_V2] = &kvm_arm_vgic_v2_ops,
#endif
#ifdef CONFIG_S390
[KVM_DEV_TYPE_FLIC] = &kvm_flic_ops,
#endif
};
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
{
if (type >= ARRAY_SIZE(kvm_device_ops_table))
return -ENOSPC;
if (kvm_device_ops_table[type] != NULL)
return -EEXIST;
kvm_device_ops_table[type] = ops;
return 0;
}
static int kvm_ioctl_create_device(struct kvm *kvm,
struct kvm_create_device *cd)
{
@ -2280,36 +2315,12 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
int ret;
switch (cd->type) {
#ifdef CONFIG_KVM_MPIC
case KVM_DEV_TYPE_FSL_MPIC_20:
case KVM_DEV_TYPE_FSL_MPIC_42:
ops = &kvm_mpic_ops;
break;
#endif
#ifdef CONFIG_KVM_XICS
case KVM_DEV_TYPE_XICS:
ops = &kvm_xics_ops;
break;
#endif
#ifdef CONFIG_KVM_VFIO
case KVM_DEV_TYPE_VFIO:
ops = &kvm_vfio_ops;
break;
#endif
#ifdef CONFIG_KVM_ARM_VGIC
case KVM_DEV_TYPE_ARM_VGIC_V2:
ops = &kvm_arm_vgic_v2_ops;
break;
#endif
#ifdef CONFIG_S390
case KVM_DEV_TYPE_FLIC:
ops = &kvm_flic_ops;
break;
#endif
default:
if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
return -ENODEV;
ops = kvm_device_ops_table[cd->type];
if (ops == NULL)
return -ENODEV;
}
if (test)
return 0;