LoongArch: KVM: Move feature detection in kvm_vm_init_features()

VM feature detection is sparsed in function kvm_vm_init_features() and
kvm_vm_feature_has_attr(). Here move all the features detection in
function kvm_vm_init_features(), and there is only feature checking in
function kvm_vm_feature_has_attr().

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

Author: bibo-mao

arch/loongarch/kvm/vm.c

@@ -29,6 +29,21 @@ static void kvm_vm_init_features(struct kvm *kvm)
 {
 	unsigned long val;
 
+	if (cpu_has_lsx)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_LSX);
+	if (cpu_has_lasx)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_LASX);
+	if (cpu_has_lbt_x86)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_X86BT);
+	if (cpu_has_lbt_arm)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_ARMBT);
+	if (cpu_has_lbt_mips)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_MIPSBT);
+	if (cpu_has_ptw)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PTW);
+	if (cpu_has_msgint)
+		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_MSGINT);
+
 	val = read_csr_gcfg();
 	if (val & CSR_GCFG_GPMP)
 		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PMU);
@@ -131,33 +146,12 @@ static int kvm_vm_feature_has_attr(struct kvm *kvm, struct kvm_device_attr *attr
 {
 	switch (attr->attr) {
 	case KVM_LOONGARCH_VM_FEAT_LSX:
-		if (cpu_has_lsx)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_LASX:
-		if (cpu_has_lasx)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_X86BT:
-		if (cpu_has_lbt_x86)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_ARMBT:
-		if (cpu_has_lbt_arm)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_MIPSBT:
-		if (cpu_has_lbt_mips)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_PTW:
-		if (cpu_has_ptw)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_MSGINT:
-		if (cpu_has_msgint)
-			return 0;
-		return -ENXIO;
 	case KVM_LOONGARCH_VM_FEAT_PMU:
 	case KVM_LOONGARCH_VM_FEAT_PV_IPI:
 	case KVM_LOONGARCH_VM_FEAT_PV_STEALTIME: