From patchwork Thu Aug 26 13:34:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12459911 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 834E7C4320A for ; Thu, 26 Aug 2021 13:48:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 673236103A for ; Thu, 26 Aug 2021 13:48:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242723AbhHZNsq (ORCPT ); Thu, 26 Aug 2021 09:48:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242731AbhHZNsq (ORCPT ); Thu, 26 Aug 2021 09:48:46 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E125CC061757 for ; Thu, 26 Aug 2021 06:47:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=46KN0SO8DFFA7SmbbIApjB/CZ+FItjv3FWXKrjt1Cgk=; b=OEaX21I1vj6CZ0PkgRnsJbQ2gK C+pVLSxtX6LZAOAFA0u8MwFqywN4A5zgiWBeSRcejCTncGUPVRNw5djEzJzyzSxF0GhaMPA8I9/8t mzXlbIYXv2+t/J/OVtaHLe1B/vX/UbqoV8MecudKcYYRNdfQCzj16NuAAiAHDdu/EFVyn2jmqyCKE KDv7aCAKpyMItf+FDxtOpBDZY2lT/j9foOx3i5NIJg7eZuYF+xA6lVwPUZByif7rNVQM7Lab4l/BU Y4X4E9u1XXhX9pT/lARNtzhC77tDxk6HKSS0EX/i7QS+bORVsKyIRCqiciktNKx5lzt5LuRVA5DbE 8oAYKxOw==; Received: from [2001:4bb8:193:fd10:d9d9:6c15:481b:99c4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mJFhx-00DLZg-0E; Thu, 26 Aug 2021 13:46:35 +0000 From: Christoph Hellwig To: Alex Williamson Cc: Diana Craciun , Cornelia Huck , Kirti Wankhede , Eric Auger , Jason Gunthorpe , kvm@vger.kernel.org, Jason Gunthorpe , Kevin Tian Subject: [PATCH 11/14] vfio: clean up the check for mediated device in vfio_iommu_type1 Date: Thu, 26 Aug 2021 15:34:21 +0200 Message-Id: <20210826133424.3362-12-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210826133424.3362-1-hch@lst.de> References: <20210826133424.3362-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Pass the group flags to ->attach_group and remove the messy check for the bus type. Signed-off-by: Christoph Hellwig Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- drivers/vfio/vfio.c | 23 +++++------------------ drivers/vfio/vfio.h | 18 +++++++++++++++++- drivers/vfio/vfio_iommu_spapr_tce.c | 2 +- drivers/vfio/vfio_iommu_type1.c | 19 ++----------------- 4 files changed, 25 insertions(+), 37 deletions(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index b2f2951f7fc759..3a668fe2ea96f7 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -68,21 +68,6 @@ struct vfio_unbound_dev { struct list_head unbound_next; }; -/* - * Virtual device without IOMMU backing. The VFIO core fakes up an iommu_group - * as the iommu_group sysfs interface is part of the userspace ABI. The user - * of these devices must not be able to directly trigger unmediated DMA. - */ -#define VFIO_EMULATED_IOMMU (1 << 0) - -/* - * Physical device without IOMMU backing. The VFIO core fakes up an iommu_group - * as the iommu_group sysfs interface is part of the userspace ABI. Users can - * trigger unmediated DMA by the device, usage is highly dangerous, requires - * an explicit opt-in and will taint the kernel. - */ -#define VFIO_NO_IOMMU (1 << 1) - struct vfio_group { struct kref kref; int minor; @@ -210,7 +195,7 @@ static long vfio_noiommu_ioctl(void *iommu_data, } static int vfio_noiommu_attach_group(void *iommu_data, - struct iommu_group *iommu_group) + struct iommu_group *iommu_group, unsigned int flags) { return 0; } @@ -1119,7 +1104,8 @@ static int __vfio_container_attach_groups(struct vfio_container *container, int ret = -ENODEV; list_for_each_entry(group, &container->group_list, container_next) { - ret = driver->ops->attach_group(data, group->iommu_group); + ret = driver->ops->attach_group(data, group->iommu_group, + group->flags); if (ret) goto unwind; } @@ -1377,7 +1363,8 @@ static int vfio_group_set_container(struct vfio_group *group, int container_fd) driver = container->iommu_driver; if (driver) { ret = driver->ops->attach_group(container->iommu_data, - group->iommu_group); + group->iommu_group, + group->flags); if (ret) goto unlock_out; } diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index a78de649eb2f16..3bdf21416563a4 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -9,6 +9,21 @@ enum vfio_iommu_notify_type { VFIO_IOMMU_CONTAINER_CLOSE = 0, }; +/* + * Virtual device without IOMMU backing. The VFIO core fakes up an iommu_group + * as the iommu_group sysfs interface is part of the userspace ABI. The user + * of these devices must not be able to directly trigger unmediated DMA. + */ +#define VFIO_EMULATED_IOMMU (1 << 0) + +/* + * Physical device without IOMMU backing. The VFIO core fakes up an iommu_group + * as the iommu_group sysfs interface is part of the userspace ABI. Users can + * trigger unmediated DMA by the device, usage is highly dangerous, requires + * an explicit opt-in and will taint the kernel. + */ +#define VFIO_NO_IOMMU (1 << 1) + /** * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks */ @@ -20,7 +35,8 @@ struct vfio_iommu_driver_ops { long (*ioctl)(void *iommu_data, unsigned int cmd, unsigned long arg); int (*attach_group)(void *iommu_data, - struct iommu_group *group); + struct iommu_group *group, + unsigned int flags); void (*detach_group)(void *iommu_data, struct iommu_group *group); int (*pin_pages)(void *iommu_data, diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c index 3efd09faeca4a8..7567328d347d25 100644 --- a/drivers/vfio/vfio_iommu_spapr_tce.c +++ b/drivers/vfio/vfio_iommu_spapr_tce.c @@ -1239,7 +1239,7 @@ static long tce_iommu_take_ownership_ddw(struct tce_container *container, } static int tce_iommu_attach_group(void *iommu_data, - struct iommu_group *iommu_group) + struct iommu_group *iommu_group, unsigned int flags) { int ret = 0; struct tce_container *container = iommu_data; diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 39e2706d0b3f34..ca3c995c84166f 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -36,7 +36,6 @@ #include #include #include -#include #include #include #include @@ -1934,20 +1933,6 @@ static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions, return ret; } -static bool vfio_bus_is_mdev(struct bus_type *bus) -{ - struct bus_type *mdev_bus; - bool ret = false; - - mdev_bus = symbol_get(mdev_bus_type); - if (mdev_bus) { - ret = (bus == mdev_bus); - symbol_put(mdev_bus_type); - } - - return ret; -} - /* * This is a helper function to insert an address range to iova list. * The list is initially created with a single entry corresponding to @@ -2172,7 +2157,7 @@ static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu, } static int vfio_iommu_type1_attach_group(void *iommu_data, - struct iommu_group *iommu_group) + struct iommu_group *iommu_group, unsigned int flags) { struct vfio_iommu *iommu = iommu_data; struct vfio_iommu_group *group; @@ -2207,7 +2192,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, if (ret) goto out_free; - if (vfio_bus_is_mdev(bus)) { + if (flags & VFIO_EMULATED_IOMMU) { if (!iommu->external_domain) { INIT_LIST_HEAD(&domain->group_list); iommu->external_domain = domain;