Commit e0fc6b21 authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
Browse files

KVM: arm64: Add vm fd device attribute accessors 



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: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230404154050.2270077-4-oliver.upton@linux.dev
parent de40bb8a

arch/arm64/kvm/arm.c

+29 −0
Original line number Diff line number Diff line
@@ -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,

		       unsigned int ioctl, unsigned long arg)

{

	struct kvm *kvm = filp->private_data;

	void __user *argp = (void __user *)arg;

	struct kvm_device_attr attr;



	switch (ioctl) {

	case KVM_CREATE_IRQCHIP: {
@@ -1479,6 +1496,18 @@ long kvm_arch_vm_ioctl(struct file *filp, 
			return -EFAULT;

		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:

		return -EINVAL;

	}