KVM: x86/xen: add KVM_XEN_HVM_SET_ATTR/KVM_XEN_HVM_GET_ATTR
This will be used to set up shared info pages etc.
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ffc4ab3..59bcba1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5630,6 +5630,26 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = kvm_xen_hvm_config(kvm, &xhc);
break;
}
+ case KVM_XEN_HVM_GET_ATTR: {
+ struct kvm_xen_hvm_attr xha;
+
+ r = -EFAULT;
+ if (copy_from_user(&xha, argp, sizeof(xha)))
+ goto out;
+ r = kvm_xen_hvm_get_attr(kvm, &xha);
+ if (!r && copy_to_user(argp, &xha, sizeof(xha)))
+ r = -EFAULT;
+ break;
+ }
+ case KVM_XEN_HVM_SET_ATTR: {
+ struct kvm_xen_hvm_attr xha;
+
+ r = -EFAULT;
+ if (copy_from_user(&xha, argp, sizeof(xha)))
+ goto out;
+ r = kvm_xen_hvm_set_attr(kvm, &xha);
+ break;
+ }
case KVM_SET_CLOCK: {
struct kvm_clock_data user_ns;
u64 now_ns;
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 7d03d91..a3fd791 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -18,6 +18,36 @@
DEFINE_STATIC_KEY_DEFERRED_FALSE(kvm_xen_enabled, HZ);
+int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
+{
+ int r = -ENOENT;
+
+ mutex_unlock(&kvm->lock);
+
+ switch (data->type) {
+ default:
+ break;
+ }
+
+ mutex_unlock(&kvm->lock);
+ return r;
+}
+
+int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data)
+{
+ int r = -ENOENT;
+
+ mutex_lock(&kvm->lock);
+
+ switch (data->type) {
+ default:
+ break;
+ }
+
+ mutex_unlock(&kvm->lock);
+ return r;
+}
+
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
{
struct kvm *kvm = vcpu->kvm;
diff --git a/arch/x86/kvm/xen.h b/arch/x86/kvm/xen.h
index ec3d8f6..0e2467f 100644
--- a/arch/x86/kvm/xen.h
+++ b/arch/x86/kvm/xen.h
@@ -13,6 +13,8 @@
extern struct static_key_false_deferred kvm_xen_enabled;
+int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
+int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data);
int kvm_xen_hypercall(struct kvm_vcpu *vcpu);
int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data);
int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc);