From: Liu Yi L <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, jgg@nvidia.com, hch@lst.de,
jasowang@redhat.com, joro@8bytes.org
Cc: kvm@vger.kernel.org, kwankhede@nvidia.com,
jean-philippe@linaro.org, dave.jiang@intel.com,
ashok.raj@intel.com, corbet@lwn.net, kevin.tian@intel.com,
parav@mellanox.com, lkml@metux.net, david@gibson.dropbear.id.au,
robin.murphy@arm.com, jun.j.tian@intel.com,
linux-kernel@vger.kernel.org, lushenming@huawei.com,
iommu@lists.linux-foundation.org, pbonzini@redhat.com,
dwmw2@infradead.org
Subject: [RFC 01/20] iommu/iommufd: Add /dev/iommu core
Date: Sun, 19 Sep 2021 14:38:29 +0800 [thread overview]
Message-ID: <20210919063848.1476776-2-yi.l.liu@intel.com> (raw)
In-Reply-To: <20210919063848.1476776-1-yi.l.liu@intel.com>
/dev/iommu aims to provide a unified interface for managing I/O address
spaces for devices assigned to userspace. This patch adds the initial
framework to create a /dev/iommu node. Each open of this node returns an
iommufd. And this fd is the handle for userspace to initiate its I/O
address space management.
One open:
- We call this feature as IOMMUFD in Kconfig in this RFC. However this
name is not clear enough to indicate its purpose to user. Back to 2010
vfio even introduced a /dev/uiommu [1] as the predecessor of its
container concept. Is that a better name? Appreciate opinions here.
[1] https://lore.kernel.org/kvm/4c0eb470.1HMjondO00NIvFM6%25pugs@cisco.com/
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
drivers/iommu/Kconfig | 1 +
drivers/iommu/Makefile | 1 +
drivers/iommu/iommufd/Kconfig | 11 ++++
drivers/iommu/iommufd/Makefile | 2 +
drivers/iommu/iommufd/iommufd.c | 112 ++++++++++++++++++++++++++++++++
5 files changed, 127 insertions(+)
create mode 100644 drivers/iommu/iommufd/Kconfig
create mode 100644 drivers/iommu/iommufd/Makefile
create mode 100644 drivers/iommu/iommufd/iommufd.c
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 07b7c25cbed8..a83ce0acd09d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -136,6 +136,7 @@ config MSM_IOMMU
source "drivers/iommu/amd/Kconfig"
source "drivers/iommu/intel/Kconfig"
+source "drivers/iommu/iommufd/Kconfig"
config IRQ_REMAP
bool "Support for Interrupt Remapping"
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index c0fb0ba88143..719c799f23ad 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
obj-$(CONFIG_IOMMU_SVA_LIB) += iommu-sva-lib.o io-pgfault.o
obj-$(CONFIG_SPRD_IOMMU) += sprd-iommu.o
+obj-$(CONFIG_IOMMUFD) += iommufd/
diff --git a/drivers/iommu/iommufd/Kconfig b/drivers/iommu/iommufd/Kconfig
new file mode 100644
index 000000000000..9fb7769a815d
--- /dev/null
+++ b/drivers/iommu/iommufd/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config IOMMUFD
+ tristate "I/O Address Space management framework for passthrough devices"
+ select IOMMU_API
+ default n
+ help
+ provides unified I/O address space management framework for
+ isolating untrusted DMAs via devices which are passed through
+ to userspace drivers.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/iommu/iommufd/Makefile b/drivers/iommu/iommufd/Makefile
new file mode 100644
index 000000000000..54381a01d003
--- /dev/null
+++ b/drivers/iommu/iommufd/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_IOMMUFD) += iommufd.o
diff --git a/drivers/iommu/iommufd/iommufd.c b/drivers/iommu/iommufd/iommufd.c
new file mode 100644
index 000000000000..710b7e62988b
--- /dev/null
+++ b/drivers/iommu/iommufd/iommufd.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * I/O Address Space Management for passthrough devices
+ *
+ * Copyright (C) 2021 Intel Corporation
+ *
+ * Author: Liu Yi L <yi.l.liu@intel.com>
+ */
+
+#define pr_fmt(fmt) "iommufd: " fmt
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/miscdevice.h>
+#include <linux/mutex.h>
+#include <linux/iommu.h>
+
+/* Per iommufd */
+struct iommufd_ctx {
+ refcount_t refs;
+};
+
+static int iommufd_fops_open(struct inode *inode, struct file *filep)
+{
+ struct iommufd_ctx *ictx;
+ int ret = 0;
+
+ ictx = kzalloc(sizeof(*ictx), GFP_KERNEL);
+ if (!ictx)
+ return -ENOMEM;
+
+ refcount_set(&ictx->refs, 1);
+ filep->private_data = ictx;
+
+ return ret;
+}
+
+static void iommufd_ctx_put(struct iommufd_ctx *ictx)
+{
+ if (refcount_dec_and_test(&ictx->refs))
+ kfree(ictx);
+}
+
+static int iommufd_fops_release(struct inode *inode, struct file *filep)
+{
+ struct iommufd_ctx *ictx = filep->private_data;
+
+ filep->private_data = NULL;
+
+ iommufd_ctx_put(ictx);
+
+ return 0;
+}
+
+static long iommufd_fops_unl_ioctl(struct file *filep,
+ unsigned int cmd, unsigned long arg)
+{
+ struct iommufd_ctx *ictx = filep->private_data;
+ long ret = -EINVAL;
+
+ if (!ictx)
+ return ret;
+
+ switch (cmd) {
+ default:
+ pr_err_ratelimited("unsupported cmd %u\n", cmd);
+ break;
+ }
+ return ret;
+}
+
+static const struct file_operations iommufd_fops = {
+ .owner = THIS_MODULE,
+ .open = iommufd_fops_open,
+ .release = iommufd_fops_release,
+ .unlocked_ioctl = iommufd_fops_unl_ioctl,
+};
+
+static struct miscdevice iommu_misc_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "iommu",
+ .fops = &iommufd_fops,
+ .nodename = "iommu",
+ .mode = 0666,
+};
+
+static int __init iommufd_init(void)
+{
+ int ret;
+
+ ret = misc_register(&iommu_misc_dev);
+ if (ret) {
+ pr_err("failed to register misc device\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void __exit iommufd_exit(void)
+{
+ misc_deregister(&iommu_misc_dev);
+}
+
+module_init(iommufd_init);
+module_exit(iommufd_exit);
+
+MODULE_AUTHOR("Liu Yi L <yi.l.liu@intel.com>");
+MODULE_DESCRIPTION("I/O Address Space Management for passthrough devices");
+MODULE_LICENSE("GPL v2");
--
2.25.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-09-19 6:41 UTC|newest]
Thread overview: 256+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-19 6:38 [RFC 00/20] Introduce /dev/iommu for userspace I/O address space management Liu Yi L
2021-09-19 6:38 ` Liu Yi L [this message]
2021-09-21 15:41 ` [RFC 01/20] iommu/iommufd: Add /dev/iommu core Jason Gunthorpe via iommu
2021-09-22 1:51 ` Tian, Kevin
2021-09-22 12:40 ` Jason Gunthorpe via iommu
2021-09-22 13:59 ` Tian, Kevin
2021-09-22 14:10 ` Jason Gunthorpe via iommu
2021-10-15 9:18 ` Liu, Yi L
2021-10-15 11:18 ` Jason Gunthorpe via iommu
2021-10-15 11:29 ` Liu, Yi L
2021-10-19 16:57 ` Jacob Pan
2021-10-19 16:57 ` Jason Gunthorpe via iommu
2021-10-19 17:11 ` Jacob Pan
2021-10-19 17:12 ` Jason Gunthorpe via iommu
2021-09-19 6:38 ` [RFC 02/20] vfio: Add device class for /dev/vfio/devices Liu Yi L
2021-09-21 15:57 ` Jason Gunthorpe via iommu
2021-09-21 23:56 ` Tian, Kevin
2021-09-22 0:55 ` Jason Gunthorpe via iommu
2021-09-22 1:07 ` Tian, Kevin
2021-09-22 12:31 ` Jason Gunthorpe via iommu
2021-09-22 3:22 ` Tian, Kevin
2021-09-22 12:50 ` Jason Gunthorpe via iommu
2021-09-22 14:09 ` Tian, Kevin
2021-09-21 19:56 ` Alex Williamson
2021-09-22 0:56 ` Tian, Kevin
2021-09-29 2:08 ` David Gibson
2021-09-29 19:05 ` Alex Williamson
2021-09-30 2:43 ` David Gibson
2021-10-20 12:39 ` Liu, Yi L
2021-09-19 6:38 ` [RFC 03/20] vfio: Add vfio_[un]register_device() Liu Yi L
2021-09-21 16:01 ` Jason Gunthorpe via iommu
2021-09-21 23:10 ` Tian, Kevin
2021-09-22 0:53 ` Jason Gunthorpe via iommu
2021-09-22 0:59 ` Tian, Kevin
2021-09-22 9:23 ` Tian, Kevin
2021-09-22 12:22 ` Jason Gunthorpe via iommu
2021-09-22 13:44 ` Tian, Kevin
2021-09-22 20:10 ` Alex Williamson
2021-09-22 22:34 ` Tian, Kevin
2021-09-22 22:45 ` Alex Williamson
2021-09-22 23:45 ` Tian, Kevin
2021-09-22 23:52 ` Jason Gunthorpe via iommu
2021-09-23 0:38 ` Tian, Kevin
2021-09-22 23:56 ` Jason Gunthorpe via iommu
2021-09-22 0:54 ` Tian, Kevin
2021-09-22 1:00 ` Jason Gunthorpe via iommu
2021-09-22 1:02 ` Tian, Kevin
2021-09-23 7:25 ` Eric Auger
2021-09-23 11:44 ` Jason Gunthorpe via iommu
2021-09-29 2:46 ` david
2021-09-29 12:22 ` Jason Gunthorpe via iommu
2021-09-30 2:48 ` david
2021-09-29 2:43 ` David Gibson
2021-09-29 3:40 ` Tian, Kevin
2021-09-29 5:30 ` Tian, Kevin
2021-09-29 7:08 ` Cornelia Huck
2021-09-29 12:15 ` Jason Gunthorpe via iommu
2021-09-19 6:38 ` [RFC 04/20] iommu: Add iommu_device_get_info interface Liu Yi L
2021-09-21 16:19 ` Jason Gunthorpe via iommu
2021-09-22 2:31 ` Lu Baolu
2021-09-22 5:07 ` Christoph Hellwig
2021-09-29 2:52 ` David Gibson
2021-09-29 9:25 ` Lu Baolu
2021-09-29 9:29 ` Lu Baolu
2021-09-19 6:38 ` [RFC 05/20] vfio/pci: Register device to /dev/vfio/devices Liu Yi L
2021-09-21 16:40 ` Jason Gunthorpe via iommu
2021-09-21 21:09 ` Alex Williamson
2021-09-21 21:58 ` Jason Gunthorpe via iommu
2021-09-22 1:24 ` Tian, Kevin
2021-09-22 1:19 ` Tian, Kevin
2021-09-22 21:17 ` Alex Williamson
2021-09-22 23:49 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 06/20] iommu: Add iommu_device_init[exit]_user_dma interfaces Liu Yi L
2021-09-21 17:09 ` Jason Gunthorpe via iommu
2021-09-22 1:47 ` Tian, Kevin
2021-09-22 12:39 ` Jason Gunthorpe via iommu
2021-09-22 13:56 ` Tian, Kevin
2021-09-27 9:42 ` Tian, Kevin
2021-09-27 11:34 ` Lu Baolu
2021-09-27 13:08 ` Tian, Kevin
2021-09-27 11:53 ` Jason Gunthorpe via iommu
2021-09-27 13:00 ` Tian, Kevin
2021-09-27 13:09 ` Jason Gunthorpe via iommu
2021-09-27 15:09 ` Jason Gunthorpe via iommu
2021-09-28 7:30 ` Tian, Kevin
2021-09-28 11:57 ` Jason Gunthorpe via iommu
2021-09-28 13:35 ` Lu Baolu
2021-09-28 14:07 ` Jason Gunthorpe via iommu
2021-09-29 0:38 ` Tian, Kevin
2021-09-29 12:59 ` Jason Gunthorpe via iommu
2021-10-15 1:29 ` Tian, Kevin
2021-10-15 11:09 ` Jason Gunthorpe via iommu
2021-10-18 1:52 ` Tian, Kevin
2021-09-29 2:22 ` Lu Baolu
2021-09-29 2:29 ` Tian, Kevin
2021-09-29 2:38 ` Lu Baolu
2021-09-29 4:55 ` David Gibson
2021-09-29 5:38 ` Tian, Kevin
2021-09-29 6:35 ` David Gibson
2021-09-29 7:31 ` Tian, Kevin
2021-09-30 3:05 ` David Gibson
2021-09-29 12:57 ` Jason Gunthorpe via iommu
2021-09-30 3:09 ` David Gibson
2021-09-30 22:28 ` Jason Gunthorpe via iommu
2021-10-01 3:54 ` David Gibson
2021-09-19 6:38 ` [RFC 07/20] iommu/iommufd: Add iommufd_[un]bind_device() Liu Yi L
2021-09-21 17:14 ` Jason Gunthorpe via iommu
2021-10-15 9:21 ` Liu, Yi L
2021-09-29 5:25 ` David Gibson
2021-09-29 12:24 ` Jason Gunthorpe via iommu
2021-09-30 3:10 ` David Gibson
2021-10-01 12:43 ` Jason Gunthorpe via iommu
2021-10-07 1:23 ` David Gibson
2021-10-07 11:35 ` Jason Gunthorpe via iommu
2021-10-11 3:24 ` David Gibson
2021-09-19 6:38 ` [RFC 08/20] vfio/pci: Add VFIO_DEVICE_BIND_IOMMUFD Liu Yi L
2021-09-21 17:29 ` Jason Gunthorpe via iommu
2021-09-22 21:01 ` Alex Williamson
2021-09-22 23:01 ` Jason Gunthorpe via iommu
2021-09-29 6:00 ` David Gibson
2021-09-29 6:41 ` Tian, Kevin
2021-09-29 12:28 ` Jason Gunthorpe via iommu
2021-09-29 22:34 ` Tian, Kevin
2021-09-30 3:12 ` David Gibson
2021-09-19 6:38 ` [RFC 09/20] iommu: Add page size and address width attributes Liu Yi L
2021-09-22 13:42 ` Eric Auger
2021-09-22 14:19 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 10/20] iommu/iommufd: Add IOMMU_DEVICE_GET_INFO Liu Yi L
2021-09-21 17:40 ` Jason Gunthorpe via iommu
2021-09-22 3:30 ` Tian, Kevin
2021-09-22 12:41 ` Jason Gunthorpe via iommu
2021-09-29 6:18 ` david
2021-09-22 21:24 ` Alex Williamson
2021-09-22 23:49 ` Jason Gunthorpe via iommu
2021-09-23 3:10 ` Tian, Kevin
2021-09-23 10:15 ` Jean-Philippe Brucker
2021-09-23 11:27 ` Jason Gunthorpe via iommu
2021-09-23 12:05 ` Tian, Kevin
2021-09-23 12:22 ` Jason Gunthorpe via iommu
2021-09-29 8:48 ` Tian, Kevin
2021-09-29 12:36 ` Jason Gunthorpe via iommu
2021-09-30 8:49 ` Tian, Kevin
2021-09-30 13:43 ` Lu Baolu
2021-10-01 3:24 ` hch
2021-09-30 22:08 ` Jason Gunthorpe via iommu
2021-09-23 11:36 ` Jason Gunthorpe via iommu
[not found] ` <BN9PR11MB5433409DF766AAEF1BB2CF258CA39@BN9PR11MB5433.namprd11.prod.outlook.com>
2021-09-23 3:38 ` Tian, Kevin
2021-09-23 11:42 ` Jason Gunthorpe via iommu
2021-09-30 9:35 ` Tian, Kevin
2021-09-30 22:23 ` Jason Gunthorpe via iommu
2021-10-01 3:30 ` hch
2021-10-14 9:11 ` Tian, Kevin
2021-10-14 15:42 ` Jason Gunthorpe via iommu
2021-10-15 1:01 ` Tian, Kevin
[not found] ` <BN9PR11MB543327BB6D58AEF91AD2C9D18CB99@BN9PR11MB5433.namprd11.prod.outlook.com>
2021-10-21 2:26 ` Tian, Kevin
2021-10-21 14:58 ` Jean-Philippe Brucker
2021-10-21 23:22 ` Jason Gunthorpe via iommu
2021-10-22 7:49 ` Jean-Philippe Brucker
2021-10-25 16:51 ` Jason Gunthorpe via iommu
2021-10-21 23:30 ` Jason Gunthorpe via iommu
2021-10-22 3:08 ` Tian, Kevin
2021-10-25 23:34 ` Jason Gunthorpe via iommu
2021-10-27 1:42 ` Tian, Kevin
2021-10-28 2:07 ` Tian, Kevin
2021-10-29 13:55 ` Jason Gunthorpe via iommu
2021-09-29 6:23 ` David Gibson
2021-09-19 6:38 ` [RFC 11/20] iommu/iommufd: Add IOMMU_IOASID_ALLOC/FREE Liu Yi L
2021-09-21 17:44 ` Jason Gunthorpe via iommu
2021-09-22 3:40 ` Tian, Kevin
2021-09-22 14:09 ` Jason Gunthorpe via iommu
2021-09-23 9:14 ` Tian, Kevin
2021-09-23 12:06 ` Jason Gunthorpe via iommu
2021-09-23 12:22 ` Tian, Kevin
2021-09-23 12:31 ` Jason Gunthorpe via iommu
2021-09-23 12:45 ` Tian, Kevin
2021-09-23 13:01 ` Jason Gunthorpe via iommu
2021-09-23 13:20 ` Tian, Kevin
2021-09-23 13:30 ` Jason Gunthorpe via iommu
2021-09-23 13:41 ` Tian, Kevin
2021-10-01 6:30 ` david
2021-10-01 6:26 ` david
2021-10-01 6:19 ` david
2021-10-01 12:25 ` Jason Gunthorpe via iommu
2021-10-02 4:21 ` david
2021-10-02 12:25 ` Jason Gunthorpe via iommu
2021-10-11 5:37 ` david
2021-10-11 17:17 ` Jason Gunthorpe via iommu
2021-10-14 4:33 ` david
2021-10-14 15:06 ` Jason Gunthorpe via iommu
2021-10-18 3:40 ` david
2021-10-01 6:15 ` david
2021-09-22 12:51 ` Liu, Yi L
2021-09-22 13:32 ` Jason Gunthorpe via iommu
2021-09-23 6:26 ` Liu, Yi L
2021-10-01 6:13 ` David Gibson
2021-10-01 12:22 ` Jason Gunthorpe via iommu
2021-10-11 6:02 ` David Gibson
2021-10-11 8:49 ` Jean-Philippe Brucker
2021-10-11 23:38 ` Jason Gunthorpe via iommu
2021-10-12 8:33 ` Jean-Philippe Brucker
2021-10-13 7:14 ` Tian, Kevin
2021-10-13 7:07 ` Tian, Kevin
2021-10-14 4:38 ` David Gibson
2021-10-11 18:49 ` Jason Gunthorpe via iommu
2021-10-14 4:53 ` David Gibson
2021-10-14 14:52 ` Jason Gunthorpe via iommu
2021-10-18 3:50 ` David Gibson
2021-10-18 17:42 ` Jason Gunthorpe via iommu
2021-09-22 13:45 ` Jean-Philippe Brucker
2021-09-29 10:47 ` Liu, Yi L
2021-10-01 6:11 ` David Gibson
2021-10-13 7:00 ` Tian, Kevin
2021-10-14 5:00 ` David Gibson
2021-10-14 6:53 ` Tian, Kevin
2021-10-25 5:05 ` David Gibson
2021-10-27 2:32 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 12/20] iommu/iommufd: Add IOMMU_CHECK_EXTENSION Liu Yi L
2021-09-21 17:47 ` Jason Gunthorpe via iommu
2021-09-22 3:41 ` Tian, Kevin
2021-09-22 12:55 ` Jason Gunthorpe via iommu
2021-09-19 6:38 ` [RFC 13/20] iommu: Extend iommu_at[de]tach_device() for multiple devices group Liu Yi L
2021-10-14 5:24 ` David Gibson
2021-10-14 7:06 ` Tian, Kevin
2021-10-18 3:57 ` David Gibson
2021-10-18 16:32 ` Jason Gunthorpe via iommu
2021-10-25 5:14 ` David Gibson
2021-10-25 12:14 ` Jason Gunthorpe via iommu
2021-10-25 13:16 ` David Gibson
2021-10-25 23:36 ` Jason Gunthorpe via iommu
2021-10-26 9:23 ` David Gibson
2021-09-19 6:38 ` [RFC 14/20] iommu/iommufd: Add iommufd_device_[de]attach_ioasid() Liu Yi L
2021-09-21 18:02 ` Jason Gunthorpe via iommu
2021-09-22 3:53 ` Tian, Kevin
2021-09-22 12:57 ` Jason Gunthorpe via iommu
2021-09-22 14:16 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 15/20] vfio/pci: Add VFIO_DEVICE_[DE]ATTACH_IOASID Liu Yi L
2021-09-21 18:04 ` Jason Gunthorpe via iommu
2021-09-22 3:56 ` Tian, Kevin
2021-09-22 12:58 ` Jason Gunthorpe via iommu
2021-09-22 14:17 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 16/20] vfio/type1: Export symbols for dma [un]map code sharing Liu Yi L
2021-09-21 18:14 ` Jason Gunthorpe via iommu
2021-09-22 3:57 ` Tian, Kevin
2021-09-19 6:38 ` [RFC 17/20] iommu/iommufd: Report iova range to userspace Liu Yi L
2021-09-22 14:49 ` Jean-Philippe Brucker
2021-09-29 10:44 ` Liu, Yi L
2021-09-29 12:07 ` Jean-Philippe Brucker
2021-09-29 12:31 ` Jason Gunthorpe via iommu
2021-09-19 6:38 ` [RFC 18/20] iommu/iommufd: Add IOMMU_[UN]MAP_DMA on IOASID Liu Yi L
2021-09-19 6:38 ` [RFC 19/20] iommu/vt-d: Implement device_info iommu_ops callback Liu Yi L
2021-09-19 6:38 ` [RFC 20/20] Doc: Add documentation for /dev/iommu Liu Yi L
2021-10-29 0:15 ` David Gibson
2021-10-29 12:44 ` Jason Gunthorpe via iommu
2021-09-19 6:45 ` [RFC 00/20] Introduce /dev/iommu for userspace I/O address space management Liu, Yi L
2021-09-21 13:45 ` Jason Gunthorpe via iommu
2021-09-22 3:25 ` Liu, Yi L
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