From nobody Tue Feb 10 12:57:31 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C1A2E31D387; Tue, 3 Feb 2026 03:31:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770089501; cv=none; b=Q2S/GNltmvZCssMCsXfbAHzhDSkpFCDDRPmJ44HYaQOi9AvMGZps1e5LI4kKnu0i5AWkQgrXhGwI0l2izh1B1C33CHpwcVBXrV+crULjSli7Ek8Y610hT2Fd+Mvl+TfT7NnoEKN4aoVy3nSc2gI6r8w1M+J9AOuyTCoBTVSw5nE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770089501; c=relaxed/simple; bh=/52FdCO+2MJf5DIczIzycLBU53I2LCS2snJAb73d9h4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QuMo5AODH0TDzJUczVufSP/nXdtirjS08j0LRTu2so0XJU/cPvGETbD6O23Gcbp70aA+a5SctGf3lf8YGeNx7LbX1hOsoUNIDHHfyMbyNA/XIniZswVVv41/ebbi18UYGJWxU6PCzLV314g4fGBzQIBvuWMpFsJaXe27+TSBHL0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8Axy8IXbIFp5zwPAA--.49026S3; Tue, 03 Feb 2026 11:31:35 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJAxGMEVbIFpbtk+AA--.37628S5; Tue, 03 Feb 2026 11:31:35 +0800 (CST) From: Bibo Mao To: Huacai Chen , WANG Xuerui , Tianrui Zhao Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: [PATCH v3 3/4] LoongArch: KVM: Move LBT capability checking in LBT exception handler Date: Tue, 3 Feb 2026 11:31:30 +0800 Message-Id: <20260203033131.3372834-4-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20260203033131.3372834-1-maobibo@loongson.cn> References: <20260203033131.3372834-1-maobibo@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJAxGMEVbIFpbtk+AA--.37628S5 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Like FPU exception handler, check LBT capability in LBT exception handler rather than function kvm_own_lbt(). Signed-off-by: Bibo Mao --- 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 74b427287e96..65ec10a7245a 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -820,8 +820,10 @@ static int kvm_handle_lasx_disabled(struct kvm_vcpu *v= cpu, int ecode) =20 static int kvm_handle_lbt_disabled(struct kvm_vcpu *vcpu, int ecode) { - if (kvm_own_lbt(vcpu)) + if (!kvm_guest_has_lbt(&vcpu->arch)) kvm_queue_exception(vcpu, EXCCODE_INE, 0); + else + kvm_own_lbt(vcpu); =20 return RESUME_GUEST; } diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index d91a1160a309..995461d724b5 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -1286,9 +1286,6 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu= , struct kvm_fpu *fpu) #ifdef CONFIG_CPU_HAS_LBT int kvm_own_lbt(struct kvm_vcpu *vcpu) { - if (!kvm_guest_has_lbt(&vcpu->arch)) - return -EINVAL; - preempt_disable(); if (!(vcpu->arch.aux_inuse & KVM_LARCH_LBT)) { set_csr_euen(CSR_EUEN_LBTEN); --=20 2.39.3