From nobody Sun Oct 5 10:49:03 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 151D928852E; Wed, 6 Aug 2025 09:00:52 +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=1754470855; cv=none; b=sbnQJ0kbC7rwoFKb+sACfVPRa2jyTc1kPrU6Luz31lqgBsQz7IuwUCxq5UQvzn6gLyNh5m6BUSGVBPA/6S8bPEI+VHr3qvsfC44ZMeBZGtdHznJvBDv2CgVrjnkyDA//LsNvQCn81U9p3zIDgeoqKlH2E+SOGXBLEYv0J65UHB4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754470855; c=relaxed/simple; bh=PesLW11khJRpGmSVJfT+LbNggq4Xf0R0wDY67UVzXGI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ujKnji4Z40v4ihbK7rtNu+XvPw1WFR4MeB/yuSBtcuuCO3YCPK+LCtJin8kIGLvJra/AgpFSQayc3AOIIxeiv130Uiy9miqSl4/iE/IQR4XqY7fzO5HWMAT0SFOCF23DsOERq+r/fpPNdPBF7xNSIovATUj6ePkG6TEP8Zlp6Vc= 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 _____8AxmnHDGZNoj5s5AQ--.47823S3; Wed, 06 Aug 2025 17:00:51 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJBxzsG+GZNoe6k4AA--.54411S5; Wed, 06 Aug 2025 17:00:49 +0800 (CST) From: Bibo Mao To: Tianrui Zhao , Huacai Chen , Xianglai Li Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] LoongArch: KVM: Make function kvm_own_lbt() robust Date: Wed, 6 Aug 2025 17:00:46 +0800 Message-Id: <20250806090046.2028785-4-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250806090046.2028785-1-maobibo@loongson.cn> References: <20250806090046.2028785-1-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: qMiowJBxzsG+GZNoe6k4AA--.54411S5 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Add flag KVM_LARCH_LBT checking in function kvm_own_lbt(), so that it can be called safely rather than duplicated enabling again. Signed-off-by: Bibo Mao --- arch/loongarch/kvm/vcpu.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index d1b8c50941ca..ce478151466c 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -1283,9 +1283,11 @@ int kvm_own_lbt(struct kvm_vcpu *vcpu) return -EINVAL; =20 preempt_disable(); - set_csr_euen(CSR_EUEN_LBTEN); - _restore_lbt(&vcpu->arch.lbt); - vcpu->arch.aux_inuse |=3D KVM_LARCH_LBT; + if (!(vcpu->arch.aux_inuse & KVM_LARCH_LBT)) { + set_csr_euen(CSR_EUEN_LBTEN); + _restore_lbt(&vcpu->arch.lbt); + vcpu->arch.aux_inuse |=3D KVM_LARCH_LBT; + } preempt_enable(); =20 return 0; --=20 2.39.3