LoongArch: KVM: Move LSX capability check in exception handler

Like FPU exception handler, check LSX capability in the LSX exception
handler rather than function kvm_own_lsx(). Since LSX capability in
the function kvm_guest_has_lsx() implies FPU capability, only checking
kvm_guest_has_lsx() is OK here.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: bibo-mao

arch/loongarch/kvm/exit.c

@@ -792,8 +792,10 @@ static long kvm_save_notify(struct kvm_vcpu *vcpu)
  */
 static int kvm_handle_lsx_disabled(struct kvm_vcpu *vcpu, int ecode)
 {
-	if (kvm_own_lsx(vcpu))
+	if (!kvm_guest_has_lsx(&vcpu->arch))
 		kvm_queue_exception(vcpu, EXCCODE_INE, 0);
+	else
+		kvm_own_lsx(vcpu);
 
 	return RESUME_GUEST;
 }

arch/loongarch/kvm/vcpu.c

@@ -1376,9 +1376,6 @@ void kvm_own_fpu(struct kvm_vcpu *vcpu)
 /* Enable LSX and restore context */
 int kvm_own_lsx(struct kvm_vcpu *vcpu)
 {
-	if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch))
-		return -EINVAL;
-
 	preempt_disable();
 
 	/* Enable LSX for guest */