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KVM: Allow kvm_device_ops to be const

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Currently a kvm_device_ops structure cannot be const without triggering
compiler warnings. However the structure doesn't need to be written to
and, by marking it const, it can be read-only in memory. Add some more
const keywords to allow this.

Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Steven Price 2019-10-21 16:28:19 +01:00 committed by Marc Zyngier
parent 8564d6372a
commit 8538cb22bb
2 changed files with 5 additions and 5 deletions
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4
include/linux/kvm_host.h
View File

@ -1262,7 +1262,7 @@ extern unsigned int halt_poll_ns_grow_start;
extern unsigned int halt_poll_ns_shrink;
struct kvm_device {
struct kvm_device_ops *ops;
const struct kvm_device_ops *ops;
struct kvm *kvm;
void *private;
struct list_head vm_node;
@ -1315,7 +1315,7 @@ struct kvm_device_ops {
void kvm_device_get(struct kvm_device *dev);
void kvm_device_put(struct kvm_device *dev);
struct kvm_device *kvm_device_from_filp(struct file *filp);
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type);
void kvm_unregister_device_ops(u32 type);
extern struct kvm_device_ops kvm_mpic_ops;

6
virt/kvm/kvm_main.c
View File

@ -3046,14 +3046,14 @@ 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] = {
static const 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
};
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type)
{
if (type >= ARRAY_SIZE(kvm_device_ops_table))
return -ENOSPC;
@ -3074,7 +3074,7 @@ void kvm_unregister_device_ops(u32 type)
static int kvm_ioctl_create_device(struct kvm *kvm,
struct kvm_create_device *cd)
{
struct kvm_device_ops *ops = NULL;
const struct kvm_device_ops *ops = NULL;
struct kvm_device *dev;
bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
int type;