linux-kernel - [PATCH 1/4] LoongArch: KVM: Move feature detection in function kvm_vm_init

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Message-Id: <20260128030326.3377462-2-maobibo@loongson.cn>
Date: Wed, 28 Jan 2026 11:03:23 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: [PATCH 1/4] LoongArch: KVM: Move feature detection in function 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 feature 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@...ngson.cn>
---
 arch/loongarch/kvm/vm.c | 36 +++++++++++++++---------------------
 1 file changed, 15 insertions(+), 21 deletions(-)

diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c
index 194ccbcdc3b3..ae79c50db9e1 100644
--- a/arch/loongarch/kvm/vm.c
+++ b/arch/loongarch/kvm/vm.c
@@ -40,6 +40,21 @@ static void kvm_vm_init_features(struct kvm *kvm)
 		kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
 		kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_STEALTIME);
 	}
+
+	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);
 }
 
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
@@ -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:
-- 
2.39.3