ARM: KVM: Implement kvm_vcpu_preferred_target() function

This patch implements kvm_vcpu_preferred_target() function for
KVM ARM which will help us implement KVM_ARM_PREFERRED_TARGET ioctl
for user space.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index 152d03612181..ec98209fda71 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -222,6 +222,26 @@ int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
         return kvm_reset_vcpu(vcpu);
 }
 
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
+{
+        int target = kvm_target_cpu();
+
+        if (target < 0)
+                return -ENODEV;
+
+        memset(init, 0, sizeof(*init));
+
+        /*
+         * For now, we don't return any features.
+         * In future, we might use features to return target
+         * specific features available for the preferred
+         * target type.
+         */
+        init->target = (__u32)target;
+
+        return 0;
+}
+
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
         return -EINVAL;