From nobody Wed Dec 17 00:14:35 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6041D14F132 for ; Tue, 2 Jul 2024 06:38:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719902283; cv=none; b=WOKocW63uuqJGVkUfX5wlw2CyE+EPNDSWEwziX7wo+iAZff+Jp9RmCk21FiYl21P1cxBI2LG73W2sojjRuLSv4RnzGCWQvjwoDwF0f0VOhzixeskf6GPKlBXmXdlk38gr/FmhZB1BMXjY/gEL+mQigJC0SxQhzXUrjSSGC8VZH4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719902283; c=relaxed/simple; bh=TYW4Hxcvr1QiCPoe35bhaALSvHSKSg7HkmF2INs3N84=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AR5uj1DPCDDhk/mgxacQIHrXbKxlnFNvZUPSrHfMMlzTOYw8c4NqiwakoV0OGE1eMyqNz95DO5dz+E44YZJ5ob1IMDZ1ZkA5SUX2Z+7iRA7l1DKx34TY3MeWGSHR1A4VtmaekUhKL1LcdDlhvN/UyMQIit48022D+vDQiwa3Aew= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Pr9o75Wn; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Pr9o75Wn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1719902282; x=1751438282; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TYW4Hxcvr1QiCPoe35bhaALSvHSKSg7HkmF2INs3N84=; b=Pr9o75Wn3DvnkebFEUPp35FR/KMiAC2cKAq/zjJgb4tBVQVoJWUv5ixy om3t6FoolnbPRiQihLHnKD1VS/AOYOd06w/CgurE7un6LX8hh1pHAKJSL Qh2Cwz20J2babwwy9VDMYMZHG4jnG7t7ZNojBEXdheEi9Sn8alhcpS2W2 Vyk/NRa0oX5YQ5fHICneIMP0UROMLeJBirfN83PTERbZs713WFu0CyU85 RJOYheWdGPaw3nrGir14aAolIoNiwJwKAyBh6mtVzNwJbKEgj9uuDvZea 2MlpGs7ZvRz8s6hg6xmHIXMdl9LVRQZh8n7zK+zDe2gHqEFzobl/OocTL Q==; X-CSE-ConnectionGUID: m/hGM+glRaWm6gnyLQuT9A== X-CSE-MsgGUID: a2u2EvRXQ+uhQmiRZAkyiQ== X-IronPort-AV: E=McAfee;i="6700,10204,11120"; a="28455670" X-IronPort-AV: E=Sophos;i="6.09,178,1716274800"; d="scan'208";a="28455670" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Jul 2024 23:38:01 -0700 X-CSE-ConnectionGUID: bmlCrGOmT4W9H+ADM3UqPg== X-CSE-MsgGUID: skIT0fJoQHq/5YnwSmP16w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,178,1716274800"; d="scan'208";a="50137284" Received: from unknown (HELO allen-box.sh.intel.com) ([10.239.159.127]) by fmviesa003.fm.intel.com with ESMTP; 01 Jul 2024 23:37:57 -0700 From: Lu Baolu To: Jason Gunthorpe , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Jean-Philippe Brucker , Nicolin Chen , Yi Liu , Jacob Pan , Joel Granados Cc: iommu@lists.linux.dev, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH v8 08/10] iommufd: Associate fault object with iommufd_hw_pgtable Date: Tue, 2 Jul 2024 14:34:42 +0800 Message-Id: <20240702063444.105814-9-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240702063444.105814-1-baolu.lu@linux.intel.com> References: <20240702063444.105814-1-baolu.lu@linux.intel.com> 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 Content-Type: text/plain; charset="utf-8" When allocating a user iommufd_hw_pagetable, the user space is allowed to associate a fault object with the hw_pagetable by specifying the fault object ID in the page table allocation data and setting the IOMMU_HWPT_FAULT_ID_VALID flag bit. On a successful return of hwpt allocation, the user can retrieve and respond to page faults by reading and writing the file interface of the fault object. Once a fault object has been associated with a hwpt, the hwpt is iopf-capable, indicated by hwpt->fault is non NULL. Attaching, detaching, or replacing an iopf-capable hwpt to an RID or PASID will differ from those that are not iopf-capable. Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian --- drivers/iommu/iommufd/iommufd_private.h | 9 ++++++ include/uapi/linux/iommufd.h | 8 ++++++ drivers/iommu/iommufd/fault.c | 17 +++++++++++ drivers/iommu/iommufd/hw_pagetable.c | 38 +++++++++++++++++++------ 4 files changed, 64 insertions(+), 8 deletions(-) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommuf= d/iommufd_private.h index aa4c26c87cb9..92efe30a8f0d 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -458,8 +458,17 @@ struct iommufd_attach_handle { /* Convert an iommu attach handle to iommufd handle. */ #define to_iommufd_handle(hdl) container_of(hdl, struct iommufd_attach_han= dle, handle) =20 +static inline struct iommufd_fault * +iommufd_get_fault(struct iommufd_ucmd *ucmd, u32 id) +{ + return container_of(iommufd_get_object(ucmd->ictx, id, + IOMMUFD_OBJ_FAULT), + struct iommufd_fault, obj); +} + int iommufd_fault_alloc(struct iommufd_ucmd *ucmd); void iommufd_fault_destroy(struct iommufd_object *obj); +int iommufd_fault_iopf_handler(struct iopf_group *group); =20 int iommufd_fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev); diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 70b8a38fcd46..ede2b464a761 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -357,10 +357,13 @@ struct iommu_vfio_ioas { * the parent HWPT in a nesting configurati= on. * @IOMMU_HWPT_ALLOC_DIRTY_TRACKING: Dirty tracking support for device IOM= MU is * enforced on device attachment + * @IOMMU_HWPT_FAULT_ID_VALID: The fault_id field of hwpt allocation data = is + * valid. */ enum iommufd_hwpt_alloc_flags { IOMMU_HWPT_ALLOC_NEST_PARENT =3D 1 << 0, IOMMU_HWPT_ALLOC_DIRTY_TRACKING =3D 1 << 1, + IOMMU_HWPT_FAULT_ID_VALID =3D 1 << 2, }; =20 /** @@ -412,6 +415,9 @@ enum iommu_hwpt_data_type { * @data_type: One of enum iommu_hwpt_data_type * @data_len: Length of the type specific data * @data_uptr: User pointer to the type specific data + * @fault_id: The ID of IOMMUFD_FAULT object. Valid only if flags field of + * IOMMU_HWPT_FAULT_ID_VALID is set. + * @__reserved2: Padding to 64-bit alignment. Must be 0. * * Explicitly allocate a hardware page table object. This is the same obje= ct * type that is returned by iommufd_device_attach() and represents the @@ -442,6 +448,8 @@ struct iommu_hwpt_alloc { __u32 data_type; __u32 data_len; __aligned_u64 data_uptr; + __u32 fault_id; + __u32 __reserved2; }; #define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC) =20 diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c index 4934ae572638..54d6cd20a673 100644 --- a/drivers/iommu/iommufd/fault.c +++ b/drivers/iommu/iommufd/fault.c @@ -414,3 +414,20 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) =20 return rc; } + +int iommufd_fault_iopf_handler(struct iopf_group *group) +{ + struct iommufd_hw_pagetable *hwpt; + struct iommufd_fault *fault; + + hwpt =3D group->attach_handle->domain->fault_data; + fault =3D hwpt->fault; + + mutex_lock(&fault->mutex); + list_add_tail(&group->node, &fault->deliver); + mutex_unlock(&fault->mutex); + + wake_up_interruptible(&fault->wait_queue); + + return 0; +} diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/h= w_pagetable.c index 33d142f8057d..e63f80f087d1 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -8,6 +8,15 @@ #include "../iommu-priv.h" #include "iommufd_private.h" =20 +static void __iommufd_hwpt_destroy(struct iommufd_hw_pagetable *hwpt) +{ + if (hwpt->domain) + iommu_domain_free(hwpt->domain); + + if (hwpt->fault) + refcount_dec(&hwpt->fault->obj.users); +} + void iommufd_hwpt_paging_destroy(struct iommufd_object *obj) { struct iommufd_hwpt_paging *hwpt_paging =3D @@ -22,9 +31,7 @@ void iommufd_hwpt_paging_destroy(struct iommufd_object *o= bj) hwpt_paging->common.domain); } =20 - if (hwpt_paging->common.domain) - iommu_domain_free(hwpt_paging->common.domain); - + __iommufd_hwpt_destroy(&hwpt_paging->common); refcount_dec(&hwpt_paging->ioas->obj.users); } =20 @@ -49,9 +56,7 @@ void iommufd_hwpt_nested_destroy(struct iommufd_object *o= bj) struct iommufd_hwpt_nested *hwpt_nested =3D container_of(obj, struct iommufd_hwpt_nested, common.obj); =20 - if (hwpt_nested->common.domain) - iommu_domain_free(hwpt_nested->common.domain); - + __iommufd_hwpt_destroy(&hwpt_nested->common); refcount_dec(&hwpt_nested->parent->common.obj.users); } =20 @@ -213,7 +218,8 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx, struct iommufd_hw_pagetable *hwpt; int rc; =20 - if (flags || !user_data->len || !ops->domain_alloc_user) + if ((flags & ~IOMMU_HWPT_FAULT_ID_VALID) || + !user_data->len || !ops->domain_alloc_user) return ERR_PTR(-EOPNOTSUPP); if (parent->auto_domain || !parent->nest_parent) return ERR_PTR(-EINVAL); @@ -227,7 +233,8 @@ iommufd_hwpt_nested_alloc(struct iommufd_ctx *ictx, refcount_inc(&parent->common.obj.users); hwpt_nested->parent =3D parent; =20 - hwpt->domain =3D ops->domain_alloc_user(idev->dev, flags, + hwpt->domain =3D ops->domain_alloc_user(idev->dev, + flags & ~IOMMU_HWPT_FAULT_ID_VALID, parent->common.domain, user_data); if (IS_ERR(hwpt->domain)) { rc =3D PTR_ERR(hwpt->domain); @@ -308,6 +315,21 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) goto out_put_pt; } =20 + if (cmd->flags & IOMMU_HWPT_FAULT_ID_VALID) { + struct iommufd_fault *fault; + + fault =3D iommufd_get_fault(ucmd, cmd->fault_id); + if (IS_ERR(fault)) { + rc =3D PTR_ERR(fault); + goto out_hwpt; + } + hwpt->fault =3D fault; + hwpt->domain->iopf_handler =3D iommufd_fault_iopf_handler; + hwpt->domain->fault_data =3D hwpt; + refcount_inc(&fault->obj.users); + iommufd_put_object(ucmd->ictx, &fault->obj); + } + cmd->out_hwpt_id =3D hwpt->obj.id; rc =3D iommufd_ucmd_respond(ucmd, sizeof(*cmd)); if (rc) --=20 2.34.1