From nobody Wed Oct 8 16:10:10 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C36DA294A12; Fri, 27 Jun 2025 09:05:14 +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=1751015117; cv=none; b=TAdhC/k0D2s3LZH9diFSUTLHqqgs2fXfKbh95B248dPWr1WfwKONEPbkRmde5DdfM1p2kPUywTB+h3akQuNw1YXC+YK3h8AsyIf6nwtdAqPPkk9Klklih5Nee8TZbHC3BiaGX/ndIkVlxrldYUOSoYvgw2RVDw0uY59ytmBoYdA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751015117; c=relaxed/simple; bh=uD27TLOkmLE97SKX+m1nAjFPEUD7oQ+EyEzUgNGPZHs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IG5dSbCqDAQ09PfebAm1bdrptBYPyKGFaJH7ck0cFmVLMbS4nacIp9JVa+Wb5/NCV4JijtypQhrGS407yRFna3PEk32jHtoa8lCK35Hy4byV7lF3lMZqs/6IVfm5zGLxCS9RdV+JYYBgO6y71lZoEOiBRocQqLdDuQvBvnLKT7U= 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 _____8DxOGrJXl5oTTIeAQ--.5091S3; Fri, 27 Jun 2025 17:05:13 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJCxM+TEXl5ovCsAAA--.1247S5; Fri, 27 Jun 2025 17:05:12 +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, stable@vger.kernel.org Subject: [PATCH v4 3/6] LoongArch: KVM: Disable update property num_cpu and feature Date: Fri, 27 Jun 2025 17:05:04 +0800 Message-Id: <20250627090507.808319-4-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250627090507.808319-1-maobibo@loongson.cn> References: <20250627090507.808319-1-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: qMiowJCxM+TEXl5ovCsAAA--.1247S5 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Property num_cpu and feature is read-only once eiointc is created, which is set with KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL attr group before device creation. Attr group KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS is to update register and software state for migration and reset usage, property num_cpu and feature can not be update again if it is created already. Here discard write operation with property num_cpu and feature in attr group KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL. Cc: stable@vger.kernel.org Fixes: 1ad7efa552fd ("LoongArch: KVM: Add EIOINTC user mode read and write = functions") Signed-off-by: Bibo Mao --- arch/loongarch/kvm/intc/eiointc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/ei= ointc.c index 0b648c56b0c3..b48511f903b5 100644 --- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -910,9 +910,22 @@ static int kvm_eiointc_sw_status_access(struct kvm_dev= ice *dev, data =3D (void __user *)attr->addr; switch (addr) { case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_NUM_CPU: + /* + * Property num_cpu and feature is read-only once eiointc is + * created with KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL group API + * + * Disable writing with KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS + * group API + */ + if (is_write) + return ret; + p =3D &s->num_cpu; break; case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_FEATURE: + if (is_write) + return ret; + p =3D &s->features; break; case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_STATE: --=20 2.39.3