[PATCH v5 10/30] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface

From: Tianrui Zhao
Date: Thu Apr 06 2023 - 22:00:54 EST


Implement loongarch vcpu KVM_ENABLE_CAP ioctl interface.

Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
---
arch/loongarch/kvm/vcpu.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 9ad6a285c..e1e616769 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -187,6 +187,23 @@ 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;
+ if (cap->cap)
+ return -EINVAL;
+
+ return r;
+}
+
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -210,6 +227,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = _kvm_get_reg(vcpu, &reg);
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;
+ }
default:
r = -ENOIOCTLCMD;
break;
--
2.31.1