KVM: nVMX: KVM_SET_NESTED_STATE - Tear down old EVMCS state before setting new state

Move call to nested_enable_evmcs until after free_nested() is complete.
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/nested.c

@@ -5333,9 +5333,6 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
 	if (kvm_state->format != 0)
 		return -EINVAL;
 
-	if (kvm_state->flags & KVM_STATE_NESTED_EVMCS)
-		nested_enable_evmcs(vcpu, NULL);
-
 	if (!nested_vmx_allowed(vcpu))
 		return kvm_state->vmx.vmxon_pa == -1ull ? 0 : -EINVAL;
 
@@ -5377,6 +5374,9 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
 	if (kvm_state->vmx.vmxon_pa == -1ull)
 		return 0;
 
+	if (kvm_state->flags & KVM_STATE_NESTED_EVMCS)
+		nested_enable_evmcs(vcpu, NULL);
+
 	vmx->nested.vmxon_ptr = kvm_state->vmx.vmxon_pa;
 	ret = enter_vmx_operation(vcpu);
 	if (ret)