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KVM: arm64: Add vm fd device attribute accessors

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A subsequent change will allow userspace to convey a filter for
hypercalls through a vm device attribute. Add the requisite boilerplate
for vm attribute accessors.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230404154050.2270077-4-oliver.upton@linux.dev
This commit is contained in:
Oliver Upton 2023-04-04 15:40:40 +00:00 committed by Marc Zyngier
parent de40bb8abb
commit e0fc6b2161
1 changed files with 29 additions and 0 deletions
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29
arch/arm64/kvm/arm.c
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@ -1439,11 +1439,28 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
} }
} }
static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
switch (attr->group) {
default:
return -ENXIO;
}
}
static int kvm_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
switch (attr->group) {
default:
return -ENXIO;
}
}
long kvm_arch_vm_ioctl(struct file *filp, long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg) unsigned int ioctl, unsigned long arg)
{ {
struct kvm *kvm = filp->private_data; struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg; void __user *argp = (void __user *)arg;
struct kvm_device_attr attr;
switch (ioctl) { switch (ioctl) {
case KVM_CREATE_IRQCHIP: { case KVM_CREATE_IRQCHIP: {
@ -1479,6 +1496,18 @@ long kvm_arch_vm_ioctl(struct file *filp,
return -EFAULT; return -EFAULT;
return kvm_vm_ioctl_mte_copy_tags(kvm, &copy_tags); return kvm_vm_ioctl_mte_copy_tags(kvm, &copy_tags);
} }
case KVM_HAS_DEVICE_ATTR: {
if (copy_from_user(&attr, argp, sizeof(attr)))
return -EFAULT;
return kvm_vm_has_attr(kvm, &attr);
}
case KVM_SET_DEVICE_ATTR: {
if (copy_from_user(&attr, argp, sizeof(attr)))
return -EFAULT;
return kvm_vm_set_attr(kvm, &attr);
}
default: default:
return -EINVAL; return -EINVAL;
} }