From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 8683357C706; Thu, 17 Sep 2026 14:03:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789653781; cv=none; b=QSjDckB336VTC+/5UoKesUlGOb3DNQT/gLOCXQb+KC4f/Gg6rSp3pI0TdorVibFoiJEIc9bkEmGIgRzavVKVzQ1fHF1BbanAW7W4glVKlyAqlNG2gk3O4rHDJI97G1Y3mKWpVBKmsYMS8m7OO91Wq2n5g4kU7iuhkjIWtxonRKs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789653781; c=relaxed/simple; bh=NOCtlZPZklY5YeSVnTqQ27iIEYvSrZ6UN7JZPDkTzbk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AYh3eFKwTpS9nV9H9NTTFhsSZtaonX1fyXql2uzS2jmkA9hfbBckARwQ+sRI0hF1HGQPkLzg2Dwi+YL/XA0TdhYmqOEbZsbn6Vdrx8Qahe9uN/JBuxhr5XRvlytxt7UXoK8XK7IAB2c0l8Qn1z9M7a+BBik36iCQyZRNpZNTpX4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jsAyS/31; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jsAyS/31" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55D4E1F00893; Thu, 17 Sep 2026 14:02:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789653780; bh=jPOre9bkQOZnirJHiSRGJjgxkloPfu9X/afpRcHUTPc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jsAyS/31fHSGYrUluZbJX2mtU6nVYzVqsJ2SwYci6NNFso8vY37+CvBAstC7YSk/g mEUYplWrMlP0E0jBJcbMZGCp05kfcJZczvtbk5P8clxxYLXtTFZDbymWZLgryUu+ad 7+BiYahpVmqlRENWXJusGYGvfuEhuXeZv3fxVlbv83ixVg5yfXUaMPXfRl3JGiYSht rWCJANeuUq86mZF5WB1AI2GdApRx7NdnnY6yIzSoOOQg9C1DWKdenDmgF0LD5vbpua vY9NrfZewkLSBiHCLbGzD+ZWRDKr4T+9OctZfol7YdqBqHhogZQRVEt9bp8qgx5giz 0NM248jgXfpjw== From: "Aneesh Kumar K.V (Arm)" To: linux-coco@lists.linux.dev, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: "Aneesh Kumar K.V (Arm)" , Jason Gunthorpe , Alexey Kardashevskiy , Bjorn Helgaas , Joerg Roedel , Jonathan Cameron , Kevin Tian , Nicolin Chen , Samuel Ortiz , Steven Price , Suzuki K Poulose , Will Deacon , Xu Yilun , Shameer Kolothum , Paolo Bonzini , Jason Gunthorpe Subject: [RFC PATCH v6 03/11] iommufd/device: Associate KVM file pointer with iommufd_device Date: Thu, 17 Sep 2026 19:31:51 +0530 Message-ID: <20260917140159.1163281-4-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260917140159.1163281-1-aneesh.kumar@kernel.org> References: <20260917140159.1163281-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Shameer Kolothum TSM vDevice support needs access to the KVM associated with a VFIO device after the device has been bound to iommufd. Extend iommufd_device_bind() to accept the device's KVM file and store it in the iommufd_device. The KVM file reference is owned by VFIO and is already held for the duration of the device open path. Signed-off-by: Shameer Kolothum Reviewed-by: Jason Gunthorpe [nicolinc: fix build error in iommufd_test_mock_domain()] Signed-off-by: Nicolin Chen [aneesh.kumar: Switch to use kvm_file] Signed-off-by: Aneesh Kumar K.V (Arm) --- drivers/iommu/iommufd/device.c | 7 ++++++- drivers/iommu/iommufd/iommufd_private.h | 2 ++ drivers/iommu/iommufd/selftest.c | 2 +- drivers/vfio/iommufd.c | 3 ++- include/linux/iommufd.h | 4 +++- 5 files changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 170a7005f0bc..718abdc0e627 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -203,6 +203,7 @@ void iommufd_device_destroy(struct iommufd_object *obj) * iommufd_device_bind - Bind a physical device to an iommu fd * @ictx: iommufd file descriptor * @dev: Pointer to a physical device struct + * @kvm_file: VM file if device belongs to a KVM VM * @id: Output ID number to return to userspace for this device * * A successful bind establishes an ownership over the device and returns @@ -216,7 +217,9 @@ void iommufd_device_destroy(struct iommufd_object *obj) * The caller must undo this with iommufd_device_unbind() */ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, - struct device *dev, u32 *id) + struct device *dev, + struct file *kvm_file, + u32 *id) { struct iommufd_device *idev; struct iommufd_group *igroup; @@ -266,6 +269,8 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, if (!iommufd_selftest_is_mock_dev(dev)) iommufd_ctx_get(ictx); idev->dev = dev; + /* reference is already taken in vfio_df_ioctl_bind_iommufd() */ + idev->kvm_file = kvm_file; idev->enforce_cache_coherency = device_iommu_capable(dev, IOMMU_CAP_ENFORCE_CACHE_COHERENCY); /* The calling driver is a user until iommufd_device_unbind() */ diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 43fbc5bed8de..6cf76f7ca379 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -488,6 +488,8 @@ struct iommufd_device { struct list_head group_item; /* always the physical device */ struct device *dev; + /* ..and the VM file if available */ + struct file *kvm_file; bool enforce_cache_coherency; struct iommufd_vdevice *vdev; bool destroying; diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index af07c642a526..a193390f9d07 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -1069,7 +1069,7 @@ static int iommufd_test_mock_domain(struct iommufd_ucmd *ucmd, goto out_sobj; } - idev = iommufd_device_bind(ucmd->ictx, &sobj->idev.mock_dev->dev, + idev = iommufd_device_bind(ucmd->ictx, &sobj->idev.mock_dev->dev, NULL, &idev_id); if (IS_ERR(idev)) { rc = PTR_ERR(idev); diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index a38d262c6028..d2d0bd9382a1 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -119,7 +119,8 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev, { struct iommufd_device *idev; - idev = iommufd_device_bind(ictx, vdev->dev, out_device_id); + idev = iommufd_device_bind(ictx, vdev->dev, vdev->kvm_file, + out_device_id); if (IS_ERR(idev)) return PTR_ERR(idev); vdev->iommufd_device = idev; diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 6e7efe83bc5d..0a0bb4abfbd2 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -59,7 +59,9 @@ struct iommufd_object { }; struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, - struct device *dev, u32 *id); + struct device *dev, + struct file *kvm_file, + u32 *id); void iommufd_device_unbind(struct iommufd_device *idev); int iommufd_device_attach(struct iommufd_device *idev, ioasid_t pasid, -- 2.43.0