Implement loongarch vcpu KVM_ENABLE_CAP, KVM_CHECK_EXTENSION ioctl
interface.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 46 +++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
@@ -415,6 +415,29 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
return 0;
}
+static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
+ struct kvm_enable_cap *cap)
+{
+ int r = 0;
+
+ if (!kvm_vm_ioctl_check_extension(vcpu->kvm, cap->cap))
+ return -EINVAL;
+ if (cap->flags)
+ return -EINVAL;
+ if (cap->args[0])
+ return -EINVAL;
+
+ switch (cap->cap) {
+ case KVM_CAP_LOONGARCH_FPU:
+ break;
+ default:
+ r = -EINVAL;
+ break;
+ }
+
+ return r;
+}
+
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -438,6 +461,29 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = _kvm_get_reg(vcpu, ®);
break;
}
+ case KVM_ENABLE_CAP: {
+ struct kvm_enable_cap cap;
+
+ r = -EFAULT;
+ if (copy_from_user(&cap, argp, sizeof(cap)))
+ break;
+ r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
+ break;
+ }
+ case KVM_CHECK_EXTENSION: {
+ unsigned int ext;
+
+ if (copy_from_user(&ext, argp, sizeof(ext)))
+ return -EFAULT;
+ switch (ext) {
+ case KVM_CAP_LOONGARCH_FPU:
+ r = !!cpu_has_fpu;
+ break;
+ default:
+ break;
+ }
+ break;
+ }
case KVM_GET_CSRS: {
r = kvm_csr_io(vcpu, argp, _kvm_getcsr);
break;