From patchwork Mon Nov 27 06:39:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13469194 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HsFim5ho" Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 241BC133; Sun, 26 Nov 2023 22:39:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701067152; x=1732603152; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pDVskkLMVGFFDFeU0VLYi3kSiq/U4WCUpxivzmmSlTI=; b=HsFim5hoB3kzXWAGVDs0KH6USQpAYzACKdQwg17QOnG1bZxQbJU3iZik TDVvhBzWvKIsNuPya+Ft2ZyMNEB3NeeiTe91kC3quKJj61JN8FKgUCyZI 3vqU43omVTSLAM2tQKl3u81gXwHoOHIwN4szP+GqRET4ZVYuaBnrz7+Fn 7NRkDHUg3zH8PU7+ukybz5KgaL267YgIDEjtJp0dpzMOSNpigvOokjhGH 3Hi+3Kb8nCzPLByhesPhB5YUixxOtupEfxh5Dkch5X+obJilZpkYD1IHR Yf+FFL7f7+WHqeJcb3kSIMVD6Lbnc34xbgVTVU85tfsgcgrugSGkY6ZY4 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10906"; a="392397735" X-IronPort-AV: E=Sophos;i="6.04,230,1695711600"; d="scan'208";a="392397735" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Nov 2023 22:39:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10906"; a="717940808" X-IronPort-AV: E=Sophos;i="6.04,230,1695711600"; d="scan'208";a="717940808" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga003.jf.intel.com with ESMTP; 26 Nov 2023 22:39:11 -0800 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, joao.m.martins@oracle.com, xin.zeng@intel.com, yan.y.zhao@intel.com Subject: [PATCH 1/3] vfio-iommufd: Support pasid [at|de]tach for physical VFIO devices Date: Sun, 26 Nov 2023 22:39:07 -0800 Message-Id: <20231127063909.129153-2-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231127063909.129153-1-yi.l.liu@intel.com> References: <20231127063909.129153-1-yi.l.liu@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Kevin Tian This adds pasid_at|de]tach_ioas ops for attaching hwpt to pasid of a device and the helpers for it. For now, only vfio-pci supports pasid attach/detach. Signed-off-by: Kevin Tian Signed-off-by: Yi Liu --- drivers/vfio/iommufd.c | 48 +++++++++++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci.c | 2 ++ include/linux/vfio.h | 11 +++++++++ 3 files changed, 61 insertions(+) diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index 82eba6966fa5..43a702b9b4d3 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -119,6 +119,7 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev, if (IS_ERR(idev)) return PTR_ERR(idev); vdev->iommufd_device = idev; + xa_init(&vdev->pasid_pts); return 0; } EXPORT_SYMBOL_GPL(vfio_iommufd_physical_bind); @@ -127,6 +128,17 @@ void vfio_iommufd_physical_unbind(struct vfio_device *vdev) { lockdep_assert_held(&vdev->dev_set->lock); + if (!xa_empty(&vdev->pasid_pts)) { + void *entry; + unsigned long index; + + xa_for_each(&vdev->pasid_pts, index, entry) { + xa_erase(&vdev->pasid_pts, index); + iommufd_device_pasid_detach(vdev->iommufd_device, index); + } + xa_destroy(&vdev->pasid_pts); + } + if (vdev->iommufd_attached) { iommufd_device_detach(vdev->iommufd_device); vdev->iommufd_attached = false; @@ -168,6 +180,42 @@ void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev) } EXPORT_SYMBOL_GPL(vfio_iommufd_physical_detach_ioas); +int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev, + u32 pasid, u32 *pt_id) +{ + void *entry; + int rc; + + lockdep_assert_held(&vdev->dev_set->lock); + + if (WARN_ON(!vdev->iommufd_device)) + return -EINVAL; + + entry = xa_load(&vdev->pasid_pts, pasid); + if (xa_is_value(entry)) + rc = iommufd_device_pasid_replace(vdev->iommufd_device, pasid, pt_id); + else + rc = iommufd_device_pasid_attach(vdev->iommufd_device, pasid, pt_id); + if (rc) + return rc; + xa_store(&vdev->pasid_pts, pasid, xa_mk_value(*pt_id), GFP_KERNEL); + return 0; +} +EXPORT_SYMBOL_GPL(vfio_iommufd_physical_pasid_attach_ioas); + +void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev, u32 pasid) +{ + lockdep_assert_held(&vdev->dev_set->lock); + + if (WARN_ON(!vdev->iommufd_device) || + !xa_is_value(xa_load(&vdev->pasid_pts, pasid))) + return; + + iommufd_device_pasid_detach(vdev->iommufd_device, pasid); + xa_erase(&vdev->pasid_pts, pasid); +} +EXPORT_SYMBOL_GPL(vfio_iommufd_physical_pasid_detach_ioas); + /* * The emulated standard ops mean that vfio_device is going to use the * "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index cb5b7f865d58..e0198851ffd2 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -142,6 +142,8 @@ static const struct vfio_device_ops vfio_pci_ops = { .unbind_iommufd = vfio_iommufd_physical_unbind, .attach_ioas = vfio_iommufd_physical_attach_ioas, .detach_ioas = vfio_iommufd_physical_detach_ioas, + .pasid_attach_ioas = vfio_iommufd_physical_pasid_attach_ioas, + .pasid_detach_ioas = vfio_iommufd_physical_pasid_detach_ioas, }; static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 454e9295970c..7b06d1bc7cb3 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -66,6 +66,7 @@ struct vfio_device { void (*put_kvm)(struct kvm *kvm); #if IS_ENABLED(CONFIG_IOMMUFD) struct iommufd_device *iommufd_device; + struct xarray pasid_pts; u8 iommufd_attached:1; #endif u8 cdev_opened:1; @@ -83,6 +84,8 @@ struct vfio_device { * bound iommufd. Undo in unbind_iommufd if @detach_ioas is not * called. * @detach_ioas: Opposite of attach_ioas + * @pasid_attach_ioas: The pasid variation of attach_ioas + * @pasid_detach_ioas: Opposite of pasid_attach_ioas * @open_device: Called when the first file descriptor is opened for this device * @close_device: Opposite of open_device * @read: Perform read(2) on device file descriptor @@ -107,6 +110,8 @@ struct vfio_device_ops { void (*unbind_iommufd)(struct vfio_device *vdev); int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id); void (*detach_ioas)(struct vfio_device *vdev); + int (*pasid_attach_ioas)(struct vfio_device *vdev, u32 pasid, u32 *pt_id); + void (*pasid_detach_ioas)(struct vfio_device *vdev, u32 pasid); int (*open_device)(struct vfio_device *vdev); void (*close_device)(struct vfio_device *vdev); ssize_t (*read)(struct vfio_device *vdev, char __user *buf, @@ -131,6 +136,8 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev, void vfio_iommufd_physical_unbind(struct vfio_device *vdev); int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id); void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev); +int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev, u32 pasid, u32 *pt_id); +void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev, u32 pasid); int vfio_iommufd_emulated_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx, u32 *out_device_id); void vfio_iommufd_emulated_unbind(struct vfio_device *vdev); @@ -158,6 +165,10 @@ vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx) ((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL) #define vfio_iommufd_physical_detach_ioas \ ((void (*)(struct vfio_device *vdev)) NULL) +#define vfio_iommufd_physical_pasid_attach_ioas \ + ((int (*)(struct vfio_device *vdev, u32 pasid, u32 *pt_id)) NULL) +#define vfio_iommufd_physical_pasid_detach_ioas \ + ((void (*)(struct vfio_device *vdev, u32 pasid)) NULL) #define vfio_iommufd_emulated_bind \ ((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \ u32 *out_device_id)) NULL)