From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B14ED2ED872; Tue, 2 Sep 2025 09:49:55 +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=1756806597; cv=none; b=d4ZYWjFuHV6nIrrSp4FKzIZfseX5pEiJaW7FLGkI1HlaxpaBTbfuo25O8HmWvmJa6sEg8E2PR1MQM5tFqXWAdjfP9jSVZS2PBW9t3PIDMFbRm1xsXcxu8pwacdBQZNdavyrkViZ94inwlflNK7gujtUuWGGsbwarRcQcR5Ah88o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756806597; c=relaxed/simple; bh=cN9I9jMTSNJN8kn0LUhtAfaQC8Rz+kldpnKp7D7k6ds=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=nQmiE8dPtdbPrlM7/D9VfT8nMO6JgiLHWo4zfEVI9nIeTksA9GBZFhq3mp8hwBWCrci7bsDMJyKKcH3D2ym+j9YsfeTnEtcI+EIdy7EmnerAzocrikWWpTEeVjxX1A1JeJIspGfK37ACSGsCK/+e62/gJ/wvGloKO/4nzYSEhWg= 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 _____8Cx77+6vbZoX7wFAA--.10650S3; Tue, 02 Sep 2025 17:49:46 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJDx_8O5vbZoyLF4AA--.52017S2; Tue, 02 Sep 2025 17:49:45 +0800 (CST) From: Bibo Mao To: Huacai Chen , Xianglai Li Cc: WANG Xuerui , kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 0/4] Move copy_from_user out of preempt disabled context Date: Tue, 2 Sep 2025 17:49:41 +0800 Message-Id: <20250902094945.2957566-1-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:qMiowJDx_8O5vbZoyLF4AA--.52017S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Function copy_from_user() and copy_to_user() may sleep because of page fault, and they cannot be called with preempt disabled context, such as spin_lock hold context. Here this patch set move copy_from_user out of preempt disabled context, local variable is added in spinlock context at first and then put to user memory from local variable without spinlock. Bibo Mao (4): LoongArch: KVM: Avoid use copy_from_user with lock hold in kvm_eiointc_regs_access LoongArch: KVM: Avoid use copy_from_user with lock hold in kvm_eiointc_sw_status_access LoongArch: KVM: Avoid use copy_from_user with lock hold in kvm_eiointc_ctrl_access LoongArch: KVM: Avoid use copy_from_user with lock hold in kvm_pch_pic_regs_access arch/loongarch/kvm/intc/eiointc.c | 87 +++++++++++++++++++------------ arch/loongarch/kvm/intc/pch_pic.c | 22 +++++--- 2 files changed, 68 insertions(+), 41 deletions(-) base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 -- 2.39.3