linux-kernel - [PATCH 1/3] LoongArch: KVM: Move LSX capability check in LSX exception handler

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Message-Id: <20260122111434.1737872-2-maobibo@loongson.cn>
Date: Thu, 22 Jan 2026 19:14:31 +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 1/3] LoongArch: KVM: Move LSX capability check in LSX exception handler

Like FPU exception handler, check LSX capability in LSX exception
handler rather than kvm_own_lsx().

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/kvm/exit.c | 4 +++-
 arch/loongarch/kvm/vcpu.c | 3 ---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index cb493980d874..76eec3f24953 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/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;
 }
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 656b954c1134..aff295aa6b0b 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1358,9 +1358,6 @@ 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 */
-- 
2.39.3