From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ABFA73803E5 for ; Tue, 14 Apr 2026 21:14:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776201261; cv=none; b=MV1AexVj6V0k7Y538WG2h2Ozq/QgqvkTNJLdF+yO0o6TrucM2eovhsXfVtTXZrWTK0PQVEo3ouFqpXFWmHVE3P1gE4xaawXLc9E2MPGCnHWwXRbuarr1MiElKFimMlXmQvwlyWNB4Yr8kIyd6x5Dub6wkkMWqaoyWlnQX1sAW7w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776201261; c=relaxed/simple; bh=8Q3cXVQNJC9cLuxWvrXeOPu2s2u4COyZ34aexMRuctE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=H7W1rVTwFlUt3sQ/Cx06WnbJ+4h8vCeV1Jk/eBmVP0N0p4Wnsr8G7xPgiY/n0JXBXrMFDnPDIBhxLh7e3ZNcSe7qR1jvCC5GB4SEX4I1e+zfiL9qMA3Al7cc/OiRcjJtDarNYVEii7PMMB9fMMgaZ57e0VarnDsN8KS1s5iDdbw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=exBpK4zi; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="exBpK4zi" Received: from DESKTOP-0403QTC.corp.microsoft.com (unknown [20.191.74.188]) by linux.microsoft.com (Postfix) with ESMTPSA id CB45220B6F08; Tue, 14 Apr 2026 14:14:18 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com CB45220B6F08 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1776201259; bh=ZuyTNPhPDg3cOv53T388OJ43zpcz1YMQ3Rnb5TsGKT0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=exBpK4ziHMNGgKjGIUCDmC8MVUooN8/xkK97zyLo+s+45kY4WPDScipnpIs1jwX3/ D7ch993IQsNo6Vr5fHLvWASINsbfpoenwyf3n9EWSoy8YzoGxdMWR/dDJbFCVHwHNx 2qaY7jC8oGJzrRjRyURRG8UT1CoFsi7+0rN9vjWY= From: Jacob Pan To: linux-kernel@vger.kernel.org, "iommu@lists.linux.dev" , Jason Gunthorpe , Alex Williamson , Joerg Roedel , Mostafa Saleh , David Matlack , Robin Murphy , Nicolin Chen , "Tian, Kevin" , Yi Liu Cc: skhawaja@google.com, pasha.tatashin@soleen.com, Will Deacon , Jacob Pan , Baolu Lu Subject: [PATCH V4 06/10] vfio: Introduce and set noiommu flag on vfio_device Date: Tue, 14 Apr 2026 14:14:08 -0700 Message-Id: <20260414211412.2729-7-jacob.pan@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260414211412.2729-1-jacob.pan@linux.microsoft.com> References: <20260414211412.2729-1-jacob.pan@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When a VFIO device is added to a noiommu group, set the noiommu flag on the vfio_device structure to indicate that the device operates in noiommu mode. Also update function signatures to pass vfio_device instead of device, which has the direct access to the noiommu flag. Reviewed-by: Mostafa Saleh Signed-off-by: Jacob Pan --- v3: - Squashed with vfio noiommu logic check patch 7/11 of v2 (Mostafa) --- drivers/vfio/group.c | 21 +++++++++++---------- drivers/vfio/vfio.h | 3 +-- include/linux/vfio.h | 1 + 3 files changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c index 451e49d851f8..b7009b44703b 100644 --- a/drivers/vfio/group.c +++ b/drivers/vfio/group.c @@ -597,7 +597,7 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group, return ret; } -static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev, +static struct vfio_group *vfio_noiommu_group_alloc(struct vfio_device *vdev, enum vfio_group_type type) { struct iommu_group *iommu_group; @@ -619,7 +619,7 @@ static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev, ret = iommu_group_set_name(iommu_group, "vfio-noiommu"); if (ret) goto out_put_group; - ret = iommu_group_add_device(iommu_group, dev); + ret = iommu_group_add_device(iommu_group, vdev->dev); if (ret) goto out_put_group; @@ -634,7 +634,7 @@ static struct vfio_group *vfio_noiommu_group_alloc(struct device *dev, return group; out_remove_device: - iommu_group_remove_device(dev); + iommu_group_remove_device(vdev->dev); out_put_group: iommu_group_put(iommu_group); return ERR_PTR(ret); @@ -655,23 +655,24 @@ static bool vfio_group_has_device(struct vfio_group *group, struct device *dev) return false; } -static struct vfio_group *vfio_group_find_or_alloc(struct device *dev) +static struct vfio_group *vfio_group_find_or_alloc(struct vfio_device *vdev) { struct iommu_group *iommu_group; struct vfio_group *group; - iommu_group = iommu_group_get(dev); + iommu_group = iommu_group_get(vdev->dev); if (!iommu_group && vfio_noiommu) { + vdev->noiommu = 1; /* * With noiommu enabled, create an IOMMU group for devices that * don't already have one, implying no IOMMU hardware/driver * exists. Taint the kernel because we're about to give a DMA * capable device to a user without IOMMU protection. */ - group = vfio_noiommu_group_alloc(dev, VFIO_NO_IOMMU); + group = vfio_noiommu_group_alloc(vdev, VFIO_NO_IOMMU); if (!IS_ERR(group)) { add_taint(TAINT_USER, LOCKDEP_STILL_OK); - dev_warn(dev, "Adding kernel taint for vfio-noiommu group on device\n"); + dev_warn(vdev->dev, "Adding kernel taint for vfio-noiommu group on device\n"); } return group; } @@ -682,7 +683,7 @@ static struct vfio_group *vfio_group_find_or_alloc(struct device *dev) mutex_lock(&vfio.group_lock); group = vfio_group_find_from_iommu(iommu_group); if (group) { - if (WARN_ON(vfio_group_has_device(group, dev))) + if (WARN_ON(vfio_group_has_device(group, vdev->dev))) group = ERR_PTR(-EINVAL); else refcount_inc(&group->drivers); @@ -702,9 +703,9 @@ int vfio_device_set_group(struct vfio_device *device, struct vfio_group *group; if (type == VFIO_IOMMU) - group = vfio_group_find_or_alloc(device->dev); + group = vfio_group_find_or_alloc(device); else - group = vfio_noiommu_group_alloc(device->dev, type); + group = vfio_noiommu_group_alloc(device, type); if (IS_ERR(group)) return PTR_ERR(group); diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index db1530bb1716..9e25605da564 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -128,8 +128,7 @@ static inline bool vfio_null_group_allowed(void) static inline bool vfio_device_is_noiommu(struct vfio_device *vdev) { - return IS_ENABLED(CONFIG_VFIO_NOIOMMU) && - vdev->group->type == VFIO_NO_IOMMU; + return IS_ENABLED(CONFIG_VFIO_NOIOMMU) && vdev->noiommu; } #else struct vfio_group; diff --git a/include/linux/vfio.h b/include/linux/vfio.h index ceb5034c3a2e..502be18a1390 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -72,6 +72,7 @@ struct vfio_device { u8 iommufd_attached:1; #endif u8 cdev_opened:1; + u8 noiommu:1; #ifdef CONFIG_DEBUG_FS /* * debug_root is a static property of the vfio_device -- 2.34.1