KVM: x86: nVMX: Allow nested_enable_evmcs to be NULL

...so that it can conditionally set by the VMX code, i.e. iff @nested is
true.  This will in turn allow it to be moved out of vmx.c and into a
nested-specified file.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6af846c54660268696b0fd0eedc993fcca4b900f..54ef79421c6b56ee915bb029df1aa2ab08476af6 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3827,6 +3827,8 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
                return kvm_hv_activate_synic(vcpu, cap->cap ==
                                             KVM_CAP_HYPERV_SYNIC2);
        case KVM_CAP_HYPERV_ENLIGHTENED_VMCS:
+               if (!kvm_x86_ops->nested_enable_evmcs)
+                       return -ENOTTY;
                r = kvm_x86_ops->nested_enable_evmcs(vcpu, &vmcs_version);
                if (!r) {
                        user_ptr = (void __user *)(uintptr_t)cap->args[0];