From patchwork Thu Aug 3 14:31:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 130677 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:9f41:0:b0:3e4:2afc:c1 with SMTP id v1csp1214208vqx; Thu, 3 Aug 2023 08:10:10 -0700 (PDT) X-Google-Smtp-Source: APBJJlH/SANCtrCYQRk0EVoHNAs7AnHMcBtxFpmlUvheG+IlwO8OULyeA7pibGw8zEFZP614aqex X-Received: by 2002:a17:903:454:b0:1b5:5162:53bd with SMTP id iw20-20020a170903045400b001b5516253bdmr18590656plb.33.1691075409904; Thu, 03 Aug 2023 08:10:09 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691075409; cv=none; d=google.com; s=arc-20160816; b=Yuxt72vWsYa9BYFUNhVvLvu4sgX1A6yxBgNz+m0j1bsvU3dTE2lEVwDkttTEm1By1i zQfNlnPkWhYfWSwkyeowTUN5dYbJI/rIF0I5e7ECuj0xFpeheew7qpEpPglL5JM0sHlN RHwKV98l/fQqRhjLgEjn8xvaYcqQpbMXYX2+XTxpJDqPyUjjxjWJ8ivk+UD4oE2z0LQf 8GatQ0LzyUe4OZ1v5lXnVW3lT/1wVB88OoG31pKmQ4uPrcslpOSLlPLSNow68S7iYMo8 Jm+LYnP7Q+/7tFk2G7L+4ldywFNLIgHxZfBOE+d0RUXvzLRwEI8QWUaeCdMZyBhJkHhf RcUA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=ms/UaDIdjCYpP60opwWSC7HWXRfDKOYiMAkZe03B49w=; fh=25kVo4cotgMzE250R6E3K5ES7E7C2JawiavlW0h5mKU=; b=j8ZFP7lAClMFDTkr8+0gkiAueOknq5SX2u5VQTte1fh8Xo3XKwEZq0IONFoncmzFVh 6rajys34P7VNEDOyMQ5iio4XlhGTH8Drw+qaoFjGMTVo1yjyynY8FSEXwUEj/1LNWHz+ f+xkRDtpxYXf6hayRxm+ZvGWe4Z7gfa/l52Tp8DR8Ey59DoVqBx/91AfjvPBb767ijJ9 8WxzJ8m8BHW/fvB+exTwR8Vz4o37dSBda4d/MQmIdnRKGOOcM48a9bjvOXwLQb5BXTde oZWJxQoBpqFdc2KK2aNEZarZ7VTMQyIzWgH/QTdcV6nexnwZZcTvC+1G3Yss7MATtMau VjJQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=foDL2oam; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id h17-20020a170902f55100b001b9eda236b5si13372056plf.506.2023.08.03.08.09.33; Thu, 03 Aug 2023 08:10:09 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=foDL2oam; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235677AbjHCOiR (ORCPT + 99 others); Thu, 3 Aug 2023 10:38:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236809AbjHCOhd (ORCPT ); Thu, 3 Aug 2023 10:37:33 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C13244B2; Thu, 3 Aug 2023 07:36:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1691073396; x=1722609396; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GHvJWmVEgPmP5fCBzqgy8RHw41J8OSR3oPgFTdNs7wU=; b=foDL2oamkQAAYFxfQLERjghjQtrncd5hPCM51/2M9yqnM8pkztowt1r1 x/fkEuLTPMuQR5Gzaa0kRp12wsYgkMjCauKth8958NWxqygSct1N4skAN bWnVunK+WB69T/SK4BWsZfaYM9mOKt7Va8nqEX+F/YTiOkE1LO5PqgEV1 Q+8EElXNFWa8BTDFGURHHfxhPHmBcgcJWE4/IPCkaLkRmEaq/P24OMNc4 fPnIzmEgDkCPt6HvrWHXbMegMz7PZPqbRM+khDkZh4sWgVPjKRWrNnFQ9 CdBUoOyJS7Ek2Fkhgjna6aBLvutXPPKh9+0eOT9TrkNg+LyUjJKQy2nqo w==; X-IronPort-AV: E=McAfee;i="6600,9927,10791"; a="372643383" X-IronPort-AV: E=Sophos;i="6.01,252,1684825200"; d="scan'208";a="372643383" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Aug 2023 07:31:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10791"; a="759153186" X-IronPort-AV: E=Sophos;i="6.01,252,1684825200"; d="scan'208";a="759153186" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga008.jf.intel.com with ESMTP; 03 Aug 2023 07:31:48 -0700 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com Subject: [PATCH v5 3/4] iommufd: Add IOMMU_GET_HW_INFO Date: Thu, 3 Aug 2023 07:31:43 -0700 Message-Id: <20230803143144.200945-4-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230803143144.200945-1-yi.l.liu@intel.com> References: <20230803143144.200945-1-yi.l.liu@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773221088858884176 X-GMAIL-MSGID: 1773221088858884176 Under nested IOMMU translation, userspace owns the stage-1 translation table (e.g. the stage-1 page table of Intel VT-d or the context table of ARM SMMUv3, and etc.). Stage-1 translation tables are vendor specific, and need to be compatiable with the underlying IOMMU hardware. Hence, userspace should know the IOMMU hardware capability before creating and configuring the stage-1 translation table to kernel. This adds IOMMU_GET_HW_INFO ioctl to query the IOMMU hardware information (a.k.a capability) for a given device. The returned data is vendor specific, userspace needs to decode it with the structure mapped by the @out_data_type field. As only physical devices have IOMMU hardware, so this will return error if the given device is not a physical device. Co-developed-by: Nicolin Chen Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu Reviewed-by: Lu Baolu --- drivers/iommu/iommufd/main.c | 79 ++++++++++++++++++++++++++++++++++++ include/uapi/linux/iommufd.h | 36 ++++++++++++++++ 2 files changed, 115 insertions(+) diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 94c498b8fdf6..a0302bcaa97c 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -17,6 +17,7 @@ #include #include #include +#include "../iommu-priv.h" #include "io_pagetable.h" #include "iommufd_private.h" @@ -177,6 +178,81 @@ static int iommufd_destroy(struct iommufd_ucmd *ucmd) return 0; } +static int iommufd_zero_fill_user(void __user *ptr, size_t bytes) +{ + int index = 0; + + for (; index < bytes; index++) { + if (put_user(0, (uint8_t __user *)(ptr + index))) + return -EFAULT; + } + return 0; +} + +static int iommufd_get_hw_info(struct iommufd_ucmd *ucmd) +{ + u32 hw_info_type = IOMMU_HW_INFO_TYPE_NONE; + struct iommu_hw_info *cmd = ucmd->cmd; + unsigned int length = 0, data_len; + struct iommufd_device *idev; + const struct iommu_ops *ops; + void __user *user_ptr; + void *data = NULL; + int rc = 0; + + if (cmd->flags || cmd->__reserved || !cmd->data_len) + return -EOPNOTSUPP; + + idev = iommufd_get_device(ucmd, cmd->dev_id); + if (IS_ERR(idev)) + return PTR_ERR(idev); + + user_ptr = u64_to_user_ptr(cmd->data_ptr); + + ops = dev_iommu_ops(idev->dev); + if (!ops->hw_info) + goto done; + + data = ops->hw_info(idev->dev, &data_len, &hw_info_type); + if (IS_ERR(data)) { + rc = PTR_ERR(data); + goto out_err; + } + + /* driver has hw_info callback should have a unique hw_info_type */ + if (WARN_ON_ONCE(hw_info_type == IOMMU_HW_INFO_TYPE_NONE)) { + rc = -ENODEV; + goto out_err; + } + + length = min(cmd->data_len, data_len); + if (copy_to_user(user_ptr, data, length)) { + rc = -EFAULT; + goto out_err; + } + +done: + /* + * Zero the trailing bytes if the user buffer is bigger than the + * data size kernel actually has. + */ + if (length < cmd->data_len) { + rc = iommufd_zero_fill_user(user_ptr + length, + cmd->data_len - length); + if (rc) + goto out_err; + } + + cmd->data_len = length; + cmd->out_data_type = hw_info_type; + rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd)); + +out_err: + kfree(data); + iommufd_put_object(&idev->obj); + return rc; +} + static int iommufd_fops_open(struct inode *inode, struct file *filp) { struct iommufd_ctx *ictx; @@ -265,6 +341,7 @@ static int iommufd_option(struct iommufd_ucmd *ucmd) union ucmd_buffer { struct iommu_destroy destroy; + struct iommu_hw_info info; struct iommu_hwpt_alloc hwpt; struct iommu_ioas_alloc alloc; struct iommu_ioas_allow_iovas allow_iovas; @@ -297,6 +374,8 @@ struct iommufd_ioctl_op { } static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = { IOCTL_OP(IOMMU_DESTROY, iommufd_destroy, struct iommu_destroy, id), + IOCTL_OP(IOMMU_GET_HW_INFO, iommufd_get_hw_info, struct iommu_hw_info, + __reserved), IOCTL_OP(IOMMU_HWPT_ALLOC, iommufd_hwpt_alloc, struct iommu_hwpt_alloc, __reserved), IOCTL_OP(IOMMU_IOAS_ALLOC, iommufd_ioas_alloc_ioctl, diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 1f616b0f8ae0..4295362e7b44 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -46,6 +46,7 @@ enum { IOMMUFD_CMD_OPTION, IOMMUFD_CMD_VFIO_IOAS, IOMMUFD_CMD_HWPT_ALLOC, + IOMMUFD_CMD_GET_HW_INFO, }; /** @@ -378,4 +379,39 @@ struct iommu_hwpt_alloc { enum iommu_hw_info_type { IOMMU_HW_INFO_TYPE_NONE, }; + +/** + * struct iommu_hw_info - ioctl(IOMMU_GET_HW_INFO) + * @size: sizeof(struct iommu_hw_info) + * @flags: Must be 0 + * @dev_id: The device bound to the iommufd + * @data_len: Input the length of the user buffer in bytes. Output the length + * of data filled in the user buffer. + * @data_ptr: Pointer to the user buffer + * @out_data_type: Output the iommu hardware info type as defined in the enum + * iommu_hw_info_type. + * @__reserved: Must be 0 + * + * Query the hardware information from an iommu behind a given device that has + * been bound to iommufd. @data_len is the size of the buffer, which captures an + * iommu type specific input data and a filled output data. Trailing bytes will + * be zeroed if the user buffer is larger than the data kernel has. + * + * The type specific data would be used to sync capabilities between the virtual + * IOMMU and the hardware IOMMU, e.g. a nested translation setup needs to check + * the hardware information, so the guest stage-1 page table will be compatible. + * + * The @out_data_type will be filled if the ioctl succeeds. It would be used to + * decode the data filled in the buffer pointed by @data_ptr. + */ +struct iommu_hw_info { + __u32 size; + __u32 flags; + __u32 dev_id; + __u32 data_len; + __aligned_u64 data_ptr; + __u32 out_data_type; + __u32 __reserved; +}; +#define IOMMU_GET_HW_INFO _IO(IOMMUFD_TYPE, IOMMUFD_CMD_GET_HW_INFO) #endif