Merge tag 'vfio-v6.6-rc1' of https://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:

 - VFIO direct character device (cdev) interface support. This extracts
   the vfio device fd from the container and group model, and is
   intended to be the native uAPI for use with IOMMUFD (Yi Liu)

 - Enhancements to the PCI hot reset interface in support of cdev usage
   (Yi Liu)

 - Fix a potential race between registering and unregistering vfio files
   in the kvm-vfio interface and extend use of a lock to avoid extra
   drop and acquires (Dmitry Torokhov)

 - A new vfio-pci variant driver for the AMD/Pensando Distributed
   Services Card (PDS) Ethernet device, supporting live migration (Brett
   Creeley)

 - Cleanups to remove redundant owner setup in cdx and fsl bus drivers,
   and simplify driver init/exit in fsl code (Li Zetao)

 - Fix uninitialized hole in data structure and pad capability
   structures for alignment (Stefan Hajnoczi)

* tag 'vfio-v6.6-rc1' of https://github.com/awilliam/linux-vfio: (53 commits)
  vfio/pds: Send type for SUSPEND_STATUS command
  vfio/pds: fix return value in pds_vfio_get_lm_file()
  pds_core: Fix function header descriptions
  vfio: align capability structures
  vfio/type1: fix cap_migration information leak
  vfio/fsl-mc: Use module_fsl_mc_driver macro to simplify the code
  vfio/cdx: Remove redundant initialization owner in vfio_cdx_driver
  vfio/pds: Add Kconfig and documentation
  vfio/pds: Add support for firmware recovery
  vfio/pds: Add support for dirty page tracking
  vfio/pds: Add VFIO live migration support
  vfio/pds: register with the pds_core PF
  pds_core: Require callers of register/unregister to pass PF drvdata
  vfio/pds: Initial support for pds VFIO driver
  vfio: Commonize combine_ranges for use in other VFIO drivers
  kvm/vfio: avoid bouncing the mutex when adding and deleting groups
  kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()
  docs: vfio: Add vfio device cdev description
  vfio: Compile vfio_group infrastructure optionally
  vfio: Move the IOMMU_CAP_CACHE_COHERENCY check in __vfio_register_dev()
  ...

31 files changed, 3251 insertions, 318 deletions

diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index aba36f5be4ec..6bda6dbb4878 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -4,6 +4,8 @@ menuconfig VFIO
 	select IOMMU_API
 	depends on IOMMUFD || !IOMMUFD
 	select INTERVAL_TREE
+	select VFIO_GROUP if SPAPR_TCE_IOMMU || IOMMUFD=n
+	select VFIO_DEVICE_CDEV if !VFIO_GROUP
 	select VFIO_CONTAINER if IOMMUFD=n
 	help
 	  VFIO provides a framework for secure userspace device drivers.
@@ -12,9 +14,33 @@ menuconfig VFIO
 	  If you don't know what to do here, say N.
 
 if VFIO
+config VFIO_DEVICE_CDEV
+	bool "Support for the VFIO cdev /dev/vfio/devices/vfioX"
+	depends on IOMMUFD && !SPAPR_TCE_IOMMU
+	default !VFIO_GROUP
+	help
+	  The VFIO device cdev is another way for userspace to get device
+	  access. Userspace gets device fd by opening device cdev under
+	  /dev/vfio/devices/vfioX, and then bind the device fd with an iommufd
+	  to set up secure DMA context for device access.  This interface does
+	  not support noiommu.
+
+	  If you don't know what to do here, say N.
+
+config VFIO_GROUP
+	bool "Support for the VFIO group /dev/vfio/$group_id"
+	default y
+	help
+	   VFIO group support provides the traditional model for accessing
+	   devices through VFIO and is used by the majority of userspace
+	   applications and drivers making use of VFIO.
+
+	   If you don't know what to do here, say Y.
+
 config VFIO_CONTAINER
 	bool "Support for the VFIO container /dev/vfio/vfio"
 	select VFIO_IOMMU_TYPE1 if MMU && (X86 || S390 || ARM || ARM64)
+	depends on VFIO_GROUP
 	default y
 	help
 	  The VFIO container is the classic interface to VFIO for establishing
@@ -36,6 +62,7 @@ endif
 
 config VFIO_NOIOMMU
 	bool "VFIO No-IOMMU support"
+	depends on VFIO_GROUP
 	help
 	  VFIO is built on the ability to isolate devices using the IOMMU.
 	  Only with an IOMMU can userspace access to DMA capable devices be
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
index 66f418aef5a9..c82ea032d352 100644
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -2,8 +2,9 @@
 obj-$(CONFIG_VFIO) += vfio.o
 
 vfio-y += vfio_main.o \
-	  group.o \
 	  iova_bitmap.o
+vfio-$(CONFIG_VFIO_DEVICE_CDEV) += device_cdev.o
+vfio-$(CONFIG_VFIO_GROUP) += group.o
 vfio-$(CONFIG_IOMMUFD) += iommufd.o
 vfio-$(CONFIG_VFIO_CONTAINER) += container.o
 vfio-$(CONFIG_VFIO_VIRQFD) += virqfd.o
diff --git a/drivers/vfio/cdx/main.c b/drivers/vfio/cdx/main.c
index c376a69d2db2..de56686581ae 100644
--- a/drivers/vfio/cdx/main.c
+++ b/drivers/vfio/cdx/main.c
@@ -223,7 +223,6 @@ static struct cdx_driver vfio_cdx_driver = {
 	.match_id_table	= vfio_cdx_table,
 	.driver	= {
 		.name	= "vfio-cdx",
-		.owner	= THIS_MODULE,
 	},
 	.driver_managed_dma = true,
 };
diff --git a/drivers/vfio/device_cdev.c b/drivers/vfio/device_cdev.c
new file mode 100644
index 000000000000..e75da0a70d1f
--- /dev/null
+++ b/drivers/vfio/device_cdev.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Intel Corporation.
+ */
+#include <linux/vfio.h>
+#include <linux/iommufd.h>
+
+#include "vfio.h"
+
+static dev_t device_devt;
+
+void vfio_init_device_cdev(struct vfio_device *device)
+{
+	device->device.devt = MKDEV(MAJOR(device_devt), device->index);
+	cdev_init(&device->cdev, &vfio_device_fops);
+	device->cdev.owner = THIS_MODULE;
+}
+
+/*
+ * device access via the fd opened by this function is blocked until
+ * .open_device() is called successfully during BIND_IOMMUFD.
+ */
+int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep)
+{
+	struct vfio_device *device = container_of(inode->i_cdev,
+						  struct vfio_device, cdev);
+	struct vfio_device_file *df;
+	int ret;
+
+	/* Paired with the put in vfio_device_fops_release() */
+	if (!vfio_device_try_get_registration(device))
+		return -ENODEV;
+
+	df = vfio_allocate_device_file(device);
+	if (IS_ERR(df)) {
+		ret = PTR_ERR(df);
+		goto err_put_registration;
+	}
+
+	filep->private_data = df;
+
+	return 0;
+
+err_put_registration:
+	vfio_device_put_registration(device);
+	return ret;
+}
+
+static void vfio_df_get_kvm_safe(struct vfio_device_file *df)
+{
+	spin_lock(&df->kvm_ref_lock);
+	vfio_device_get_kvm_safe(df->device, df->kvm);
+	spin_unlock(&df->kvm_ref_lock);
+}
+
+long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
+				struct vfio_device_bind_iommufd __user *arg)
+{
+	struct vfio_device *device = df->device;
+	struct vfio_device_bind_iommufd bind;
+	unsigned long minsz;
+	int ret;
+
+	static_assert(__same_type(arg->out_devid, df->devid));
+
+	minsz = offsetofend(struct vfio_device_bind_iommufd, out_devid);
+
+	if (copy_from_user(&bind, arg, minsz))
+		return -EFAULT;
+
+	if (bind.argsz < minsz || bind.flags || bind.iommufd < 0)
+		return -EINVAL;
+
+	/* BIND_IOMMUFD only allowed for cdev fds */
+	if (df->group)
+		return -EINVAL;
+
+	ret = vfio_device_block_group(device);
+	if (ret)
+		return ret;
+
+	mutex_lock(&device->dev_set->lock);
+	/* one device cannot be bound twice */
+	if (df->access_granted) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
+
+	df->iommufd = iommufd_ctx_from_fd(bind.iommufd);
+	if (IS_ERR(df->iommufd)) {
+		ret = PTR_ERR(df->iommufd);
+		df->iommufd = NULL;
+		goto out_unlock;
+	}
+
+	/*
+	 * Before the device open, get the KVM pointer currently
+	 * associated with the device file (if there is) and obtain
+	 * a reference.  This reference is held until device closed.
+	 * Save the pointer in the device for use by drivers.
+	 */
+	vfio_df_get_kvm_safe(df);
+
+	ret = vfio_df_open(df);
+	if (ret)
+		goto out_put_kvm;
+
+	ret = copy_to_user(&arg->out_devid, &df->devid,
+			   sizeof(df->devid)) ? -EFAULT : 0;
+	if (ret)
+		goto out_close_device;
+
+	device->cdev_opened = true;
+	/*
+	 * Paired with smp_load_acquire() in vfio_device_fops::ioctl/
+	 * read/write/mmap
+	 */
+	smp_store_release(&df->access_granted, true);
+	mutex_unlock(&device->dev_set->lock);
+	return 0;
+
+out_close_device:
+	vfio_df_close(df);
+out_put_kvm:
+	vfio_device_put_kvm(device);
+	iommufd_ctx_put(df->iommufd);
+	df->iommufd = NULL;
+out_unlock:
+	mutex_unlock(&device->dev_set->lock);
+	vfio_device_unblock_group(device);
+	return ret;
+}
+
+void vfio_df_unbind_iommufd(struct vfio_device_file *df)
+{
+	struct vfio_device *device = df->device;
+
+	/*
+	 * In the time of close, there is no contention with another one
+	 * changing this flag.  So read df->access_granted without lock
+	 * and no smp_load_acquire() is ok.
+	 */
+	if (!df->access_granted)
+		return;
+
+	mutex_lock(&device->dev_set->lock);
+	vfio_df_close(df);
+	vfio_device_put_kvm(device);
+	iommufd_ctx_put(df->iommufd);
+	device->cdev_opened = false;
+	mutex_unlock(&device->dev_set->lock);
+	vfio_device_unblock_group(device);
+}
+
+int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
+			    struct vfio_device_attach_iommufd_pt __user *arg)
+{
+	struct vfio_device *device = df->device;
+	struct vfio_device_attach_iommufd_pt attach;
+	unsigned long minsz;
+	int ret;
+
+	minsz = offsetofend(struct vfio_device_attach_iommufd_pt, pt_id);
+
+	if (copy_from_user(&attach, arg, minsz))
+		return -EFAULT;
+
+	if (attach.argsz < minsz || attach.flags)
+		return -EINVAL;
+
+	mutex_lock(&device->dev_set->lock);
+	ret = device->ops->attach_ioas(device, &attach.pt_id);
+	if (ret)
+		goto out_unlock;
+
+	if (copy_to_user(&arg->pt_id, &attach.pt_id, sizeof(attach.pt_id))) {
+		ret = -EFAULT;
+		goto out_detach;
+	}
+	mutex_unlock(&device->dev_set->lock);
+
+	return 0;
+
+out_detach:
+	device->ops->detach_ioas(device);
+out_unlock:
+	mutex_unlock(&device->dev_set->lock);
+	return ret;
+}
+
+int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
+			    struct vfio_device_detach_iommufd_pt __user *arg)
+{
+	struct vfio_device *device = df->device;
+	struct vfio_device_detach_iommufd_pt detach;
+	unsigned long minsz;
+
+	minsz = offsetofend(struct vfio_device_detach_iommufd_pt, flags);
+
+	if (copy_from_user(&detach, arg, minsz))
+		return -EFAULT;
+
+	if (detach.argsz < minsz || detach.flags)
+		return -EINVAL;
+
+	mutex_lock(&device->dev_set->lock);
+	device->ops->detach_ioas(device);
+	mutex_unlock(&device->dev_set->lock);
+
+	return 0;
+}
+
+static char *vfio_device_devnode(const struct device *dev, umode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "vfio/devices/%s", dev_name(dev));
+}
+
+int vfio_cdev_init(struct class *device_class)
+{
+	device_class->devnode = vfio_device_devnode;
+	return alloc_chrdev_region(&device_devt, 0,
+				   MINORMASK + 1, "vfio-dev");
+}
+
+void vfio_cdev_cleanup(void)
+{
+	unregister_chrdev_region(device_devt, MINORMASK + 1);
+}
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
index f2140e94d41e..f65d91c01f2e 100644
--- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -593,6 +593,7 @@ static const struct vfio_device_ops vfio_fsl_mc_ops = {
 	.bind_iommufd	= vfio_iommufd_physical_bind,
 	.unbind_iommufd	= vfio_iommufd_physical_unbind,
 	.attach_ioas	= vfio_iommufd_physical_attach_ioas,
+	.detach_ioas	= vfio_iommufd_physical_detach_ioas,
 };
 
 static struct fsl_mc_driver vfio_fsl_mc_driver = {
@@ -600,23 +601,11 @@ static struct fsl_mc_driver vfio_fsl_mc_driver = {
 	.remove		= vfio_fsl_mc_remove,
 	.driver	= {
 		.name	= "vfio-fsl-mc",
-		.owner	= THIS_MODULE,
 	},
 	.driver_managed_dma = true,
 };
 
-static int __init vfio_fsl_mc_driver_init(void)
-{
-	return fsl_mc_driver_register(&vfio_fsl_mc_driver);
-}
-
-static void __exit vfio_fsl_mc_driver_exit(void)
-{
-	fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
-}
-
-module_init(vfio_fsl_mc_driver_init);
-module_exit(vfio_fsl_mc_driver_exit);
+module_fsl_mc_driver(vfio_fsl_mc_driver);
 
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");
diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c
index fc75c1000d74..610a429c6191 100644
--- a/drivers/vfio/group.c
+++ b/drivers/vfio/group.c
@@ -160,17 +160,13 @@ out_unlock:
 static void vfio_device_group_get_kvm_safe(struct vfio_device *device)
 {
 	spin_lock(&device->group->kvm_ref_lock);
-	if (!device->group->kvm)
-		goto unlock;
-
-	_vfio_device_get_kvm_safe(device, device->group->kvm);
-
-unlock:
+	vfio_device_get_kvm_safe(device, device->group->kvm);
 	spin_unlock(&device->group->kvm_ref_lock);
 }
 
-static int vfio_device_group_open(struct vfio_device *device)
+static int vfio_df_group_open(struct vfio_device_file *df)
 {
+	struct vfio_device *device = df->device;
 	int ret;
 
 	mutex_lock(&device->group->group_lock);
@@ -190,24 +186,62 @@ static int vfio_device_group_open(struct vfio_device *device)
 	if (device->open_count == 0)
 		vfio_device_group_get_kvm_safe(device);
 
-	ret = vfio_device_open(device, device->group->iommufd);
+	df->iommufd = device->group->iommufd;
+	if (df->iommufd && vfio_device_is_noiommu(device) && device->open_count == 0) {
+		/*
+		 * Require no compat ioas to be assigned to proceed.  The basic
+		 * statement is that the user cannot have done something that
+		 * implies they expected translation to exist
+		 */
+		if (!capable(CAP_SYS_RAWIO) ||
+		    vfio_iommufd_device_has_compat_ioas(device, df->iommufd))
+			ret = -EPERM;
+		else
+			ret = 0;
+		goto out_put_kvm;
+	}
 
-	if (device->open_count == 0)
-		vfio_device_put_kvm(device);
+	ret = vfio_df_open(df);
+	if (ret)
+		goto out_put_kvm;
+
+	if (df->iommufd && device->open_count == 1) {
+		ret = vfio_iommufd_compat_attach_ioas(device, df->iommufd);
+		if (ret)
+			goto out_close_device;
+	}
+
+	/*
+	 * Paired with smp_load_acquire() in vfio_device_fops::ioctl/
+	 * read/write/mmap and vfio_file_has_device_access()
+	 */
+	smp_store_release(&df->access_granted, true);
 
 	mutex_unlock(&device->dev_set->lock);
+	mutex_unlock(&device->group->group_lock);
+	return 0;
 
+out_close_device:
+	vfio_df_close(df);
+out_put_kvm:
+	df->iommufd = NULL;
+	if (device->open_count == 0)
+		vfio_device_put_kvm(device);
+	mutex_unlock(&device->dev_set->lock);
 out_unlock:
 	mutex_unlock(&device->group->group_lock);
 	return ret;
 }
 
-void vfio_device_group_close(struct vfio_device *device)
+void vfio_df_group_close(struct vfio_device_file *df)
 {
+	struct vfio_device *device = df->device;
+
 	mutex_lock(&device->group->group_lock);
 	mutex_lock(&device->dev_set->lock);
 
-	vfio_device_close(device, device->group->iommufd);
+	vfio_df_close(df);
+	df->iommufd = NULL;
 
 	if (device->open_count == 0)
 		vfio_device_put_kvm(device);
@@ -218,19 +252,28 @@ void vfio_device_group_close(struct vfio_device *device)
 
 static struct file *vfio_device_open_file(struct vfio_device *device)
 {
+	struct vfio_device_file *df;
 	struct file *filep;
 	int ret;
 
-	ret = vfio_device_group_open(device);
-	if (ret)
+	df = vfio_allocate_device_file(device);
+	if (IS_ERR(df)) {
+		ret = PTR_ERR(df);
 		goto err_out;
+	}
+
+	df->group = device->group;
+
+	ret = vfio_df_group_open(df);
+	if (ret)
+		goto err_free;
 
 	/*
 	 * We can't use anon_inode_getfd() because we need to modify
 	 * the f_mode flags directly to allow more than just ioctls
 	 */
 	filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
-				   device, O_RDWR);
+				   df, O_RDWR);
 	if (IS_ERR(filep)) {
 		ret = PTR_ERR(filep);
 		goto err_close_device;
@@ -253,7 +296,9 @@ static struct file *vfio_device_open_file(struct vfio_device *device)
 	return filep;
 
 err_close_device:
-	vfio_device_group_close(device);
+	vfio_df_group_close(df);
+err_free:
+	kfree(df);
 err_out:
 	return ERR_PTR(ret);
 }
@@ -357,6 +402,33 @@ static long vfio_group_fops_unl_ioctl(struct file *filep,
 	}
 }
 
+int vfio_device_block_group(struct vfio_device *device)
+{
+	struct vfio_group *group = device->group;
+	int ret = 0;
+
+	mutex_lock(&group->group_lock);
+	if (group->opened_file) {
+		ret = -EBUSY;
+		goto out_unlock;
+	}
+
+	group->cdev_device_open_cnt++;
+
+out_unlock:
+	mutex_unlock(&group->group_lock);
+	return ret;
+}
+
+void vfio_device_unblock_group(struct vfio_device *device)
+{
+	struct vfio_group *group = device->group;
+
+	mutex_lock(&group->group_lock);
+	group->cdev_device_open_cnt--;
+	mutex_unlock(&group->group_lock);
+}
+
 static int vfio_group_fops_open(struct inode *inode, struct file *filep)
 {
 	struct vfio_group *group =
@@ -379,6 +451,11 @@ static int vfio_group_fops_open(struct inode *inode, struct file *filep)
 		goto out_unlock;
 	}
 
+	if (group->cdev_device_open_cnt) {
+		ret = -EBUSY;
+		goto out_unlock;
+	}
+
 	/*
 	 * Do we need multiple instances of the group open?  Seems not.
 	 */
@@ -453,6 +530,7 @@ static void vfio_group_release(struct device *dev)
 	mutex_destroy(&group->device_lock);
 	mutex_destroy(&group->group_lock);
 	WARN_ON(group->iommu_group);
+	WARN_ON(group->cdev_device_open_cnt);
 	ida_free(&vfio.group_ida, MINOR(group->dev.devt));
 	kfree(group);
 }
@@ -604,16 +682,6 @@ static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
 	if (!iommu_group)
 		return ERR_PTR(-EINVAL);
 
-	/*
-	 * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
-	 * restore cache coherency. It has to be checked here because it is only
-	 * valid for cases where we are using iommu groups.
-	 */
-	if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
-		iommu_group_put(iommu_group);
-		return ERR_PTR(-EINVAL);
-	}
-
 	mutex_lock(&vfio.group_lock);
 	group = vfio_group_find_from_iommu(iommu_group);
 	if (group) {
@@ -745,6 +813,15 @@ bool vfio_device_has_container(struct vfio_device *device)
 	return device->group->container;
 }
 
+struct vfio_group *vfio_group_from_file(struct file *file)
+{
+	struct vfio_group *group = file->private_data;
+
+	if (file->f_op != &vfio_group_fops)
+		return NULL;
+	return group;
+}
+
 /**
  * vfio_file_iommu_group - Return the struct iommu_group for the vfio group file
  * @file: VFIO group file
@@ -755,13 +832,13 @@ bool vfio_device_has_container(struct vfio_device *device)
  */
 struct iommu_group *vfio_file_iommu_group(struct file *file)
 {
-	struct vfio_group *group = file->private_data;
+	struct vfio_group *group = vfio_group_from_file(file);
 	struct iommu_group *iommu_group = NULL;
 
 	if (!IS_ENABLED(CONFIG_SPAPR_TCE_IOMMU))
 		return NULL;
 
-	if (!vfio_file_is_group(file))
+	if (!group)
 		return NULL;
 
 	mutex_lock(&group->group_lock);
@@ -775,33 +852,20 @@ struct iommu_group *vfio_file_iommu_group(struct file *file)
 EXPORT_SYMBOL_GPL(vfio_file_iommu_group);
 
 /**
- * vfio_file_is_group - True if the file is usable with VFIO aPIS
+ * vfio_file_is_group - True if the file is a vfio group file
  * @file: VFIO group file
  */
 bool vfio_file_is_group(struct file *file)
 {
-	return file->f_op == &vfio_group_fops;
+	return vfio_group_from_file(file);
 }
 EXPORT_SYMBOL_GPL(vfio_file_is_group);
 
-/**
- * vfio_file_enforced_coherent - True if the DMA associated with the VFIO file
- *        is always CPU cache coherent
- * @file: VFIO group file
- *
- * Enforced coherency means that the IOMMU ignores things like the PCIe no-snoop
- * bit in DMA transactions. A return of false indicates that the user has
- * rights to access additional instructions such as wbinvd on x86.
- */
-bool vfio_file_enforced_coherent(struct file *file)
+bool vfio_group_enforced_coherent(struct vfio_group *group)
 {
-	struct vfio_group *group = file->private_data;
 	struct vfio_device *device;
 	bool ret = true;
 
-	if (!vfio_file_is_group(file))
-		return true;
-
 	/*
 	 * If the device does not have IOMMU_CAP_ENFORCE_CACHE_COHERENCY then
 	 * any domain later attached to it will also not support it. If the cap
@@ -819,28 +883,13 @@ bool vfio_file_enforced_coherent(struct file *file)
 	mutex_unlock(&group->device_lock);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
 
-/**
- * vfio_file_set_kvm - Link a kvm with VFIO drivers
- * @file: VFIO group file
- * @kvm: KVM to link
- *
- * When a VFIO device is first opened the KVM will be available in
- * device->kvm if one was associated with the group.
- */
-void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
+void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
 {
-	struct vfio_group *group = file->private_data;
-
-	if (!vfio_file_is_group(file))
-		return;
-
 	spin_lock(&group->kvm_ref_lock);
 	group->kvm = kvm;
 	spin_unlock(&group->kvm_ref_lock);
 }
-EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
 
 /**
  * vfio_file_has_dev - True if the VFIO file is a handle for device
@@ -851,9 +900,9 @@ EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
  */
 bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
 {
-	struct vfio_group *group = file->private_data;
+	struct vfio_group *group = vfio_group_from_file(file);
 
-	if (!vfio_file_is_group(file))
+	if (!group)
 		return false;
 
 	return group == device->group;
diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
index 88b00c501015..4d84904fd927 100644
--- a/drivers/vfio/iommufd.c
+++ b/drivers/vfio/iommufd.c
@@ -10,53 +10,48 @@
 MODULE_IMPORT_NS(IOMMUFD);
 MODULE_IMPORT_NS(IOMMUFD_VFIO);
 
-int vfio_iommufd_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx)
+bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
+					 struct iommufd_ctx *ictx)
+{
+	u32 ioas_id;
+
+	return !iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id);
+}
+
+int vfio_df_iommufd_bind(struct vfio_device_file *df)
+{
+	struct vfio_device *vdev = df->device;
+	struct iommufd_ctx *ictx = df->iommufd;
+
+	lockdep_assert_held(&vdev->dev_set->lock);
+
+	return vdev->ops->bind_iommufd(vdev, ictx, &df->devid);
+}
+
+int vfio_iommufd_compat_attach_ioas(struct vfio_device *vdev,
+				    struct iommufd_ctx *ictx)
 {
 	u32 ioas_id;
-	u32 device_id;
 	int ret;
 
 	lockdep_assert_held(&vdev->dev_set->lock);
 
-	if (vfio_device_is_noiommu(vdev)) {
-		if (!capable(CAP_SYS_RAWIO))
-			return -EPERM;
-
-		/*
-		 * Require no compat ioas to be assigned to proceed. The basic
-		 * statement is that the user cannot have done something that
-		 * implies they expected translation to exist
-		 */
-		if (!iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id))
-			return -EPERM;
+	/* compat noiommu does not need to do ioas attach */
+	if (vfio_device_is_noiommu(vdev))
 		return 0;
-	}
-
-	ret = vdev->ops->bind_iommufd(vdev, ictx, &device_id);
-	if (ret)
-		return ret;
 
 	ret = iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id);
 	if (ret)
-		goto err_unbind;
-	ret = vdev->ops->attach_ioas(vdev, &ioas_id);
-	if (ret)
-		goto err_unbind;
-
-	/*
-	 * The legacy path has no way to return the device id or the selected
-	 * pt_id
-	 */
-	return 0;
+		return ret;
 
-err_unbind:
-	if (vdev->ops->unbind_iommufd)
-		vdev->ops->unbind_iommufd(vdev);
-	return ret;
+	/* The legacy path has no way to return the selected pt_id */
+	return vdev->ops->attach_ioas(vdev, &ioas_id);
 }
 
-void vfio_iommufd_unbind(struct vfio_device *vdev)
+void vfio_df_iommufd_unbind(struct vfio_device_file *df)
 {
+	struct vfio_device *vdev = df->device;
+
 	lockdep_assert_held(&vdev->dev_set->lock);
 
 	if (vfio_device_is_noiommu(vdev))
@@ -66,6 +61,50 @@ void vfio_iommufd_unbind(struct vfio_device *vdev)
 		vdev->ops->unbind_iommufd(vdev);
 }
 
+struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev)
+{
+	if (vdev->iommufd_device)
+		return iommufd_device_to_ictx(vdev->iommufd_device);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_device_ictx);
+
+static int vfio_iommufd_device_id(struct vfio_device *vdev)
+{
+	if (vdev->iommufd_device)
+		return iommufd_device_to_id(vdev->iommufd_device);
+	return -EINVAL;
+}
+
+/*
+ * Return devid for a device.
+ *  valid ID for the device that is owned by the ictx
+ *  -ENOENT = device is owned but there is no ID
+ *  -ENODEV or other error = device is not owned
+ */
+int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
+{
+	struct iommu_group *group;
+	int devid;
+
+	if (vfio_iommufd_device_ictx(vdev) == ictx)
+		return vfio_iommufd_device_id(vdev);
+
+	group = iommu_group_get(vdev->dev);
+	if (!group)
+		return -ENODEV;
+
+	if (iommufd_ctx_has_group(ictx, group))
+		devid = -ENOENT;
+	else
+		devid = -ENODEV;
+
+	iommu_group_put(group);
+
+	return devid;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_get_dev_id);
+
 /*
  * The physical standard ops mean that the iommufd_device is bound to the
  * physical device vdev->dev that was provided to vfio_init_group_dev(). Drivers
@@ -101,6 +140,14 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
 {
 	int rc;
 
+	lockdep_assert_held(&vdev->dev_set->lock);
+
+	if (WARN_ON(!vdev->iommufd_device))
+		return -EINVAL;
+
+	if (vdev->iommufd_attached)
+		return -EBUSY;
+
 	rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
 	if (rc)
 		return rc;
@@ -109,6 +156,18 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
 }
 EXPORT_SYMBOL_GPL(vfio_iommufd_physical_attach_ioas);
 
+void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev)
+{
+	lockdep_assert_held(&vdev->dev_set->lock);
+
+	if (WARN_ON(!vdev->iommufd_device) || !vdev->iommufd_attached)
+		return;
+
+	iommufd_device_detach(vdev->iommufd_device);
+	vdev->iommufd_attached = false;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_physical_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
@@ -172,3 +231,16 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_attach_ioas);
+
+void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev)
+{
+	lockdep_assert_held(&vdev->dev_set->lock);
+
+	if (WARN_ON(!vdev->iommufd_access) ||
+	    !vdev->iommufd_attached)
+		return;
+
+	iommufd_access_detach(vdev->iommufd_access);
+	vdev->iommufd_attached = false;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_detach_ioas);
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 86bb7835cf3c..8125e5f37832 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -63,4 +63,6 @@ source "drivers/vfio/pci/mlx5/Kconfig"
 
 source "drivers/vfio/pci/hisilicon/Kconfig"
 
+source "drivers/vfio/pci/pds/Kconfig"
+
 endmenu
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 24c524224da5..45167be462d8 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -11,3 +11,5 @@ obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
 obj-$(CONFIG_MLX5_VFIO_PCI)           += mlx5/
 
 obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
+
+obj-$(CONFIG_PDS_VFIO_PCI) += pds/
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index a117eaf21c14..b2f9778c8366 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -1373,6 +1373,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_migrn_ops = {
 	.bind_iommufd = vfio_iommufd_physical_bind,
 	.unbind_iommufd = vfio_iommufd_physical_unbind,
 	.attach_ioas = vfio_iommufd_physical_attach_ioas,
+	.detach_ioas = vfio_iommufd_physical_detach_ioas,
 };
 
 static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
@@ -1391,6 +1392,7 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_ops = {
 	.bind_iommufd = vfio_iommufd_physical_bind,
 	.unbind_iommufd = vfio_iommufd_physical_unbind,
 	.attach_ioas = vfio_iommufd_physical_attach_ioas,
+	.detach_ioas = vfio_iommufd_physical_detach_ioas,
 };
 
 static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c
index c82c1f4fc588..33574b04477d 100644
--- a/drivers/vfio/pci/mlx5/cmd.c
+++ b/drivers/vfio/pci/mlx5/cmd.c
@@ -732,52 +732,6 @@ void mlx5fv_cmd_clean_migf_resources(struct mlx5_vf_migration_file *migf)
 	mlx5vf_cmd_dealloc_pd(migf);
 }
 
-static void combine_ranges(struct rb_root_cached *root, u32 cur_nodes,
-			   u32 req_nodes)
-{
-	struct interval_tree_node *prev, *curr, *comb_start, *comb_end;
-	unsigned long min_gap;
-	unsigned long curr_gap;
-
-	/* Special shortcut when a single range is required */
-	if (req_nodes == 1) {
-		unsigned long last;
-
-		curr = comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
-		while (curr) {
-			last = curr->last;
-			prev = curr;
-			curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
-			if (prev != comb_start)
-				interval_tree_remove(prev, root);
-		}
-		comb_start->last = last;
-		return;
-	}
-
-	/* Combine ranges which have the smallest gap */
-	while (cur_nodes > req_nodes) {
-		prev = NULL;
-		min_gap = ULONG_MAX;
-		curr = interval_tree_iter_first(root, 0, ULONG_MAX);
-		while (curr) {
-			if (prev) {
-				curr_gap = curr->start - prev->last;
-				if (curr_gap < min_gap) {
-					min_gap = curr_gap;
-					comb_start = prev;
-					comb_end = curr;
-				}
-			}
-			prev = curr;
-			curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
-		}
-		comb_start->last = comb_end->last;
-		interval_tree_remove(comb_end, root);
-		cur_nodes--;
-	}
-}
-
 static int mlx5vf_create_tracker(struct mlx5_core_dev *mdev,
 				 struct mlx5vf_pci_core_device *mvdev,
 				 struct rb_root_cached *ranges, u32 nnodes)
@@ -800,7 +754,7 @@ static int mlx5vf_create_tracker(struct mlx5_core_dev *mdev,
 	int i;
 
 	if (num_ranges > max_num_range) {
-		combine_ranges(ranges, nnodes, max_num_range);
+		vfio_combine_iova_ranges(ranges, nnodes, max_num_range);
 		num_ranges = max_num_range;
 	}
 
diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c
index d95fd382814c..42ec574a8622 100644
--- a/drivers/vfio/pci/mlx5/main.c
+++ b/drivers/vfio/pci/mlx5/main.c
@@ -1320,6 +1320,7 @@ static const struct vfio_device_ops mlx5vf_pci_ops = {
 	.bind_iommufd = vfio_iommufd_physical_bind,
 	.unbind_iommufd = vfio_iommufd_physical_unbind,
 	.attach_ioas = vfio_iommufd_physical_attach_ioas,
+	.detach_ioas = vfio_iommufd_physical_detach_ioas,
 };
 
 static int mlx5vf_pci_probe(struct pci_dev *pdev,
diff --git a/drivers/vfio/pci/pds/Kconfig b/drivers/vfio/pci/pds/Kconfig
new file mode 100644
index 000000000000..407b3fd32733
--- /dev/null
+++ b/drivers/vfio/pci/pds/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Advanced Micro Devices, Inc.
+
+config PDS_VFIO_PCI
+	tristate "VFIO support for PDS PCI devices"
+	depends on PDS_CORE
+	select VFIO_PCI_CORE
+	help
+	  This provides generic PCI support for PDS devices using the VFIO
+	  framework.
+
+	  More specific information on this driver can be
+	  found in
+	  <file:Documentation/networking/device_drivers/ethernet/amd/pds_vfio_pci.rst>.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called pds-vfio-pci.
+
+	  If you don't know what to do here, say N.
diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
new file mode 100644
index 000000000000..d5a06d81634f
--- /dev/null
+++ b/drivers/vfio/pci/pds/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2023 Advanced Micro Devices, Inc.
+
+obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o
+
+pds-vfio-pci-y := \
+	cmds.o		\
+	dirty.o		\
+	lm.o		\
+	pci_drv.o	\
+	vfio_dev.o
diff --git a/drivers/vfio/pci/pds/cmds.c b/drivers/vfio/pci/pds/cmds.c
new file mode 100644
index 000000000000..36463ccc3df9
--- /dev/null
+++ b/drivers/vfio/pci/pds/cmds.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+
+#include <linux/pds/pds_common.h>
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+
+#include "vfio_dev.h"
+#include "cmds.h"
+
+#define SUSPEND_TIMEOUT_S		5
+#define SUSPEND_CHECK_INTERVAL_MS	1
+
+static int pds_vfio_client_adminq_cmd(struct pds_vfio_pci_device *pds_vfio,
+				      union pds_core_adminq_cmd *req,
+				      union pds_core_adminq_comp *resp,
+				      bool fast_poll)
+{
+	struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
+	union pds_core_adminq_cmd cmd = {};
+	struct pdsc *pdsc;
+	int err;
+
+	/* Wrap the client request */
+	cmd.client_request.opcode = PDS_AQ_CMD_CLIENT_CMD;
+	cmd.client_request.client_id = cpu_to_le16(pds_vfio->client_id);
+	memcpy(cmd.client_request.client_cmd, req,
+	       sizeof(cmd.client_request.client_cmd));
+
+	pdsc = pdsc_get_pf_struct(pdev);
+	if (IS_ERR(pdsc))
+		return PTR_ERR(pdsc);
+
+	err = pdsc_adminq_post(pdsc, &cmd, resp, fast_poll);
+	if (err && err != -EAGAIN)
+		dev_err(pds_vfio_to_dev(pds_vfio),
+			"client admin cmd failed: %pe\n", ERR_PTR(err));
+
+	return err;
+}
+
+int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
+	char devname[PDS_DEVNAME_LEN];
+	struct pdsc *pdsc;
+	int ci;
+
+	snprintf(devname, sizeof(devname), "%s.%d-%u", PDS_VFIO_LM_DEV_NAME,
+		 pci_domain_nr(pdev->bus),
+		 PCI_DEVID(pdev->bus->number, pdev->devfn));
+
+	pdsc = pdsc_get_pf_struct(pdev);
+	if (IS_ERR(pdsc))
+		return PTR_ERR(pdsc);
+
+	ci = pds_client_register(pdsc, devname);
+	if (ci < 0)
+		return ci;
+
+	pds_vfio->client_id = ci;
+
+	return 0;
+}
+
+void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
+	struct pdsc *pdsc;
+	int err;
+
+	pdsc = pdsc_get_pf_struct(pdev);
+	if (IS_ERR(pdsc))
+		return;
+
+	err = pds_client_unregister(pdsc, pds_vfio->client_id);
+	if (err)
+		dev_err(&pdev->dev, "unregister from DSC failed: %pe\n",
+			ERR_PTR(err));
+
+	pds_vfio->client_id = 0;
+}
+
+static int
+pds_vfio_suspend_wait_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_suspend_status = {
+			.opcode = PDS_LM_CMD_SUSPEND_STATUS,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.type = type,
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	unsigned long time_limit;
+	unsigned long time_start;
+	unsigned long time_done;
+	int err;
+
+	time_start = jiffies;
+	time_limit = time_start + HZ * SUSPEND_TIMEOUT_S;
+	do {
+		err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
+		if (err != -EAGAIN)
+			break;
+
+		msleep(SUSPEND_CHECK_INTERVAL_MS);
+	} while (time_before(jiffies, time_limit));
+
+	time_done = jiffies;
+	dev_dbg(dev, "%s: vf%u: Suspend comp received in %d msecs\n", __func__,
+		pds_vfio->vf_id, jiffies_to_msecs(time_done - time_start));
+
+	/* Check the results */
+	if (time_after_eq(time_done, time_limit)) {
+		dev_err(dev, "%s: vf%u: Suspend comp timeout\n", __func__,
+			pds_vfio->vf_id);
+		err = -ETIMEDOUT;
+	}
+
+	return err;
+}
+
+int pds_vfio_suspend_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_suspend = {
+			.opcode = PDS_LM_CMD_SUSPEND,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.type = type,
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	dev_dbg(dev, "vf%u: Suspend device\n", pds_vfio->vf_id);
+
+	/*
+	 * The initial suspend request to the firmware starts the device suspend
+	 * operation and the firmware returns success if it's started
+	 * successfully.
+	 */
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
+	if (err) {
+		dev_err(dev, "vf%u: Suspend failed: %pe\n", pds_vfio->vf_id,
+			ERR_PTR(err));
+		return err;
+	}
+
+	/*
+	 * The subsequent suspend status request(s) check if the firmware has
+	 * completed the device suspend process.
+	 */
+	return pds_vfio_suspend_wait_device_cmd(pds_vfio, type);
+}
+
+int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_resume = {
+			.opcode = PDS_LM_CMD_RESUME,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.type = type,
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+
+	dev_dbg(dev, "vf%u: Resume device\n", pds_vfio->vf_id);
+
+	return pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, true);
+}
+
+int pds_vfio_get_lm_state_size_cmd(struct pds_vfio_pci_device *pds_vfio, u64 *size)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_state_size = {
+			.opcode = PDS_LM_CMD_STATE_SIZE,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	dev_dbg(dev, "vf%u: Get migration status\n", pds_vfio->vf_id);
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err)
+		return err;
+
+	*size = le64_to_cpu(comp.lm_state_size.size);
+	return 0;
+}
+
+static int pds_vfio_dma_map_lm_file(struct device *dev,
+				    enum dma_data_direction dir,
+				    struct pds_vfio_lm_file *lm_file)
+{
+	struct pds_lm_sg_elem *sgl, *sge;
+	struct scatterlist *sg;
+	dma_addr_t sgl_addr;
+	size_t sgl_size;
+	int err;
+	int i;
+
+	if (!lm_file)
+		return -EINVAL;
+
+	/* dma map file pages */
+	err = dma_map_sgtable(dev, &lm_file->sg_table, dir, 0);
+	if (err)
+		return err;
+
+	lm_file->num_sge = lm_file->sg_table.nents;
+
+	/* alloc sgl */
+	sgl_size = lm_file->num_sge * sizeof(struct pds_lm_sg_elem);
+	sgl = kzalloc(sgl_size, GFP_KERNEL);
+	if (!sgl) {
+		err = -ENOMEM;
+		goto out_unmap_sgtable;
+	}
+
+	/* fill sgl */
+	sge = sgl;
+	for_each_sgtable_dma_sg(&lm_file->sg_table, sg, i) {
+		sge->addr = cpu_to_le64(sg_dma_address(sg));
+		sge->len = cpu_to_le32(sg_dma_len(sg));
+		dev_dbg(dev, "addr = %llx, len = %u\n", sge->addr, sge->len);
+		sge++;
+	}
+
+	sgl_addr = dma_map_single(dev, sgl, sgl_size, DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, sgl_addr)) {
+		err = -EIO;
+		goto out_free_sgl;
+	}
+
+	lm_file->sgl = sgl;
+	lm_file->sgl_addr = sgl_addr;
+
+	return 0;
+
+out_free_sgl:
+	kfree(sgl);
+out_unmap_sgtable:
+	lm_file->num_sge = 0;
+	dma_unmap_sgtable(dev, &lm_file->sg_table, dir, 0);
+	return err;
+}
+
+static void pds_vfio_dma_unmap_lm_file(struct device *dev,
+				       enum dma_data_direction dir,
+				       struct pds_vfio_lm_file *lm_file)
+{
+	if (!lm_file)
+		return;
+
+	/* free sgl */
+	if (lm_file->sgl) {
+		dma_unmap_single(dev, lm_file->sgl_addr,
+				 lm_file->num_sge * sizeof(*lm_file->sgl),
+				 DMA_TO_DEVICE);
+		kfree(lm_file->sgl);
+		lm_file->sgl = NULL;
+		lm_file->sgl_addr = DMA_MAPPING_ERROR;
+		lm_file->num_sge = 0;
+	}
+
+	/* dma unmap file pages */
+	dma_unmap_sgtable(dev, &lm_file->sg_table, dir, 0);
+}
+
+int pds_vfio_get_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_save = {
+			.opcode = PDS_LM_CMD_SAVE,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+		},
+	};
+	struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	union pds_core_adminq_comp comp = {};
+	struct pds_vfio_lm_file *lm_file;
+	int err;
+
+	dev_dbg(&pdev->dev, "vf%u: Get migration state\n", pds_vfio->vf_id);
+
+	lm_file = pds_vfio->save_file;
+
+	err = pds_vfio_dma_map_lm_file(pdsc_dev, DMA_FROM_DEVICE, lm_file);
+	if (err) {
+		dev_err(&pdev->dev, "failed to map save migration file: %pe\n",
+			ERR_PTR(err));
+		return err;
+	}
+
+	cmd.lm_save.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
+	cmd.lm_save.num_sge = cpu_to_le32(lm_file->num_sge);
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err)
+		dev_err(&pdev->dev, "failed to get migration state: %pe\n",
+			ERR_PTR(err));
+
+	pds_vfio_dma_unmap_lm_file(pdsc_dev, DMA_FROM_DEVICE, lm_file);
+
+	return err;
+}
+
+int pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_restore = {
+			.opcode = PDS_LM_CMD_RESTORE,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+		},
+	};
+	struct pci_dev *pdev = pds_vfio_to_pci_dev(pds_vfio);
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	union pds_core_adminq_comp comp = {};
+	struct pds_vfio_lm_file *lm_file;
+	int err;
+
+	dev_dbg(&pdev->dev, "vf%u: Set migration state\n", pds_vfio->vf_id);
+
+	lm_file = pds_vfio->restore_file;
+
+	err = pds_vfio_dma_map_lm_file(pdsc_dev, DMA_TO_DEVICE, lm_file);
+	if (err) {
+		dev_err(&pdev->dev,
+			"failed to map restore migration file: %pe\n",
+			ERR_PTR(err));
+		return err;
+	}
+
+	cmd.lm_restore.sgl_addr = cpu_to_le64(lm_file->sgl_addr);
+	cmd.lm_restore.num_sge = cpu_to_le32(lm_file->num_sge);
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err)
+		dev_err(&pdev->dev, "failed to set migration state: %pe\n",
+			ERR_PTR(err));
+
+	pds_vfio_dma_unmap_lm_file(pdsc_dev, DMA_TO_DEVICE, lm_file);
+
+	return err;
+}
+
+void pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+					 enum pds_lm_host_vf_status vf_status)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_host_vf_status = {
+			.opcode = PDS_LM_CMD_HOST_VF_STATUS,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.status = vf_status,
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	dev_dbg(dev, "vf%u: Set host VF LM status: %u", pds_vfio->vf_id,
+		vf_status);
+	if (vf_status != PDS_LM_STA_IN_PROGRESS &&
+	    vf_status != PDS_LM_STA_NONE) {
+		dev_warn(dev, "Invalid host VF migration status, %d\n",
+			 vf_status);
+		return;
+	}
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err)
+		dev_warn(dev, "failed to send host VF migration status: %pe\n",
+			 ERR_PTR(err));
+}
+
+int pds_vfio_dirty_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+			      u64 regions_dma, u8 *max_regions, u8 *num_regions)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_dirty_status = {
+			.opcode = PDS_LM_CMD_DIRTY_STATUS,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	dev_dbg(dev, "vf%u: Dirty status\n", pds_vfio->vf_id);
+
+	cmd.lm_dirty_status.regions_dma = cpu_to_le64(regions_dma);
+	cmd.lm_dirty_status.max_regions = *max_regions;
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err) {
+		dev_err(dev, "failed to get dirty status: %pe\n", ERR_PTR(err));
+		return err;
+	}
+
+	/* only support seq_ack approach for now */
+	if (!(le32_to_cpu(comp.lm_dirty_status.bmp_type_mask) &
+	      BIT(PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK))) {
+		dev_err(dev, "Dirty bitmap tracking SEQ_ACK not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	*num_regions = comp.lm_dirty_status.num_regions;
+	*max_regions = comp.lm_dirty_status.max_regions;
+
+	dev_dbg(dev,
+		"Page Tracking Status command successful, max_regions: %d, num_regions: %d, bmp_type: %s\n",
+		*max_regions, *num_regions, "PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK");
+
+	return 0;
+}
+
+int pds_vfio_dirty_enable_cmd(struct pds_vfio_pci_device *pds_vfio,
+			      u64 regions_dma, u8 num_regions)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_dirty_enable = {
+			.opcode = PDS_LM_CMD_DIRTY_ENABLE,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.regions_dma = cpu_to_le64(regions_dma),
+			.bmp_type = PDS_LM_DIRTY_BMP_TYPE_SEQ_ACK,
+			.num_regions = num_regions,
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err) {
+		dev_err(dev, "failed dirty tracking enable: %pe\n",
+			ERR_PTR(err));
+		return err;
+	}
+
+	return 0;
+}
+
+int pds_vfio_dirty_disable_cmd(struct pds_vfio_pci_device *pds_vfio)
+{
+	union pds_core_adminq_cmd cmd = {
+		.lm_dirty_disable = {
+			.opcode = PDS_LM_CMD_DIRTY_DISABLE,
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err || comp.lm_dirty_status.num_regions != 0) {
+		/* in case num_regions is still non-zero after disable */
+		err = err ? err : -EIO;
+		dev_err(dev,
+			"failed dirty tracking disable: %pe, num_regions %d\n",
+			ERR_PTR(err), comp.lm_dirty_status.num_regions);
+		return err;
+	}
+
+	return 0;
+}
+
+int pds_vfio_dirty_seq_ack_cmd(struct pds_vfio_pci_device *pds_vfio,
+			       u64 sgl_dma, u16 num_sge, u32 offset,
+			       u32 total_len, bool read_seq)
+{
+	const char *cmd_type_str = read_seq ? "read_seq" : "write_ack";
+	union pds_core_adminq_cmd cmd = {
+		.lm_dirty_seq_ack = {
+			.vf_id = cpu_to_le16(pds_vfio->vf_id),
+			.len_bytes = cpu_to_le32(total_len),
+			.off_bytes = cpu_to_le32(offset),
+			.sgl_addr = cpu_to_le64(sgl_dma),
+			.num_sge = cpu_to_le16(num_sge),
+		},
+	};
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_adminq_comp comp = {};
+	int err;
+
+	if (read_seq)
+		cmd.lm_dirty_seq_ack.opcode = PDS_LM_CMD_DIRTY_READ_SEQ;
+	else
+		cmd.lm_dirty_seq_ack.opcode = PDS_LM_CMD_DIRTY_WRITE_ACK;
+
+	err = pds_vfio_client_adminq_cmd(pds_vfio, &cmd, &comp, false);
+	if (err) {
+		dev_err(dev, "failed cmd Page Tracking %s: %pe\n", cmd_type_str,
+			ERR_PTR(err));
+		return err;
+	}
+
+	return 0;
+}
diff --git a/drivers/vfio/pci/pds/cmds.h b/drivers/vfio/pci/pds/cmds.h
new file mode 100644
index 000000000000..95221100b954
--- /dev/null
+++ b/drivers/vfio/pci/pds/cmds.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _CMDS_H_
+#define _CMDS_H_
+
+int pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_unregister_client_cmd(struct pds_vfio_pci_device *pds_vfio);
+int pds_vfio_suspend_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type);
+int pds_vfio_resume_device_cmd(struct pds_vfio_pci_device *pds_vfio, u8 type);
+int pds_vfio_get_lm_state_size_cmd(struct pds_vfio_pci_device *pds_vfio, u64 *size);
+int pds_vfio_get_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio);
+int pds_vfio_set_lm_state_cmd(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_send_host_vf_lm_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+					 enum pds_lm_host_vf_status vf_status);
+int pds_vfio_dirty_status_cmd(struct pds_vfio_pci_device *pds_vfio,
+			      u64 regions_dma, u8 *max_regions,
+			      u8 *num_regions);
+int pds_vfio_dirty_enable_cmd(struct pds_vfio_pci_device *pds_vfio,
+			      u64 regions_dma, u8 num_regions);
+int pds_vfio_dirty_disable_cmd(struct pds_vfio_pci_device *pds_vfio);
+int pds_vfio_dirty_seq_ack_cmd(struct pds_vfio_pci_device *pds_vfio,
+			       u64 sgl_dma, u16 num_sge, u32 offset,
+			       u32 total_len, bool read_seq);
+#endif /* _CMDS_H_ */
diff --git a/drivers/vfio/pci/pds/dirty.c b/drivers/vfio/pci/pds/dirty.c
new file mode 100644
index 000000000000..c937aa6f3954
--- /dev/null
+++ b/drivers/vfio/pci/pds/dirty.c
@@ -0,0 +1,564 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/interval_tree.h>
+#include <linux/vfio.h>
+
+#include <linux/pds/pds_common.h>
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+
+#include "vfio_dev.h"
+#include "cmds.h"
+#include "dirty.h"
+
+#define READ_SEQ true
+#define WRITE_ACK false
+
+bool pds_vfio_dirty_is_enabled(struct pds_vfio_pci_device *pds_vfio)
+{
+	return pds_vfio->dirty.is_enabled;
+}
+
+void pds_vfio_dirty_set_enabled(struct pds_vfio_pci_device *pds_vfio)
+{
+	pds_vfio->dirty.is_enabled = true;
+}
+
+void pds_vfio_dirty_set_disabled(struct pds_vfio_pci_device *pds_vfio)
+{
+	pds_vfio->dirty.is_enabled = false;
+}
+
+static void
+pds_vfio_print_guest_region_info(struct pds_vfio_pci_device *pds_vfio,
+				 u8 max_regions)
+{
+	int len = max_regions * sizeof(struct pds_lm_dirty_region_info);
+	struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	struct pds_lm_dirty_region_info *region_info;
+	dma_addr_t regions_dma;
+	u8 num_regions;
+	int err;
+
+	region_info = kcalloc(max_regions,
+			      sizeof(struct pds_lm_dirty_region_info),
+			      GFP_KERNEL);
+	if (!region_info)
+		return;
+
+	regions_dma =
+		dma_map_single(pdsc_dev, region_info, len, DMA_FROM_DEVICE);
+	if (dma_mapping_error(pdsc_dev, regions_dma))
+		goto out_free_region_info;
+
+	err = pds_vfio_dirty_status_cmd(pds_vfio, regions_dma, &max_regions,
+					&num_regions);
+	dma_unmap_single(pdsc_dev, regions_dma, len, DMA_FROM_DEVICE);
+	if (err)
+		goto out_free_region_info;
+
+	for (unsigned int i = 0; i < num_regions; i++)
+		dev_dbg(&pdev->dev,
+			"region_info[%d]: dma_base 0x%llx page_count %u page_size_log2 %u\n",
+			i, le64_to_cpu(region_info[i].dma_base),
+			le32_to_cpu(region_info[i].page_count),
+			region_info[i].page_size_log2);
+
+out_free_region_info:
+	kfree(region_info);
+}
+
+static int pds_vfio_dirty_alloc_bitmaps(struct pds_vfio_dirty *dirty,
+					unsigned long bytes)
+{
+	unsigned long *host_seq_bmp, *host_ack_bmp;
+
+	host_seq_bmp = vzalloc(bytes);
+	if (!host_seq_bmp)
+		return -ENOMEM;
+
+	host_ack_bmp = vzalloc(bytes);
+	if (!host_ack_bmp) {
+		bitmap_free(host_seq_bmp);
+		return -ENOMEM;
+	}
+
+	dirty->host_seq.bmp = host_seq_bmp;
+	dirty->host_ack.bmp = host_ack_bmp;
+
+	return 0;
+}
+
+static void pds_vfio_dirty_free_bitmaps(struct pds_vfio_dirty *dirty)
+{
+	vfree(dirty->host_seq.bmp);
+	vfree(dirty->host_ack.bmp);
+	dirty->host_seq.bmp = NULL;
+	dirty->host_ack.bmp = NULL;
+}
+
+static void __pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio,
+				      struct pds_vfio_bmp_info *bmp_info)
+{
+	struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+
+	dma_unmap_single(pdsc_dev, bmp_info->sgl_addr,
+			 bmp_info->num_sge * sizeof(struct pds_lm_sg_elem),
+			 DMA_BIDIRECTIONAL);
+	kfree(bmp_info->sgl);
+
+	bmp_info->num_sge = 0;
+	bmp_info->sgl = NULL;
+	bmp_info->sgl_addr = 0;
+}
+
+static void pds_vfio_dirty_free_sgl(struct pds_vfio_pci_device *pds_vfio)
+{
+	if (pds_vfio->dirty.host_seq.sgl)
+		__pds_vfio_dirty_free_sgl(pds_vfio, &pds_vfio->dirty.host_seq);
+	if (pds_vfio->dirty.host_ack.sgl)
+		__pds_vfio_dirty_free_sgl(pds_vfio, &pds_vfio->dirty.host_ack);
+}
+
+static int __pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
+				      struct pds_vfio_bmp_info *bmp_info,
+				      u32 page_count)
+{
+	struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	struct pds_lm_sg_elem *sgl;
+	dma_addr_t sgl_addr;
+	size_t sgl_size;
+	u32 max_sge;
+
+	max_sge = DIV_ROUND_UP(page_count, PAGE_SIZE * 8);
+	sgl_size = max_sge * sizeof(struct pds_lm_sg_elem);
+
+	sgl = kzalloc(sgl_size, GFP_KERNEL);
+	if (!sgl)
+		return -ENOMEM;
+
+	sgl_addr = dma_map_single(pdsc_dev, sgl, sgl_size, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(pdsc_dev, sgl_addr)) {
+		kfree(sgl);
+		return -EIO;
+	}
+
+	bmp_info->sgl = sgl;
+	bmp_info->num_sge = max_sge;
+	bmp_info->sgl_addr = sgl_addr;
+
+	return 0;
+}
+
+static int pds_vfio_dirty_alloc_sgl(struct pds_vfio_pci_device *pds_vfio,
+				    u32 page_count)
+{
+	struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+	int err;
+
+	err = __pds_vfio_dirty_alloc_sgl(pds_vfio, &dirty->host_seq,
+					 page_count);
+	if (err)
+		return err;
+
+	err = __pds_vfio_dirty_alloc_sgl(pds_vfio, &dirty->host_ack,
+					 page_count);
+	if (err) {
+		__pds_vfio_dirty_free_sgl(pds_vfio, &dirty->host_seq);
+		return err;
+	}
+
+	return 0;
+}
+
+static int pds_vfio_dirty_enable(struct pds_vfio_pci_device *pds_vfio,
+				 struct rb_root_cached *ranges, u32 nnodes,
+				 u64 *page_size)
+{
+	struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+	u64 region_start, region_size, region_page_size;
+	struct pds_lm_dirty_region_info *region_info;
+	struct interval_tree_node *node = NULL;
+	u8 max_regions = 0, num_regions;
+	dma_addr_t regions_dma = 0;
+	u32 num_ranges = nnodes;
+	u32 page_count;
+	u16 len;
+	int err;
+
+	dev_dbg(&pdev->dev, "vf%u: Start dirty page tracking\n",
+		pds_vfio->vf_id);
+
+	if (pds_vfio_dirty_is_enabled(pds_vfio))
+		return -EINVAL;
+
+	/* find if dirty tracking is disabled, i.e. num_regions == 0 */
+	err = pds_vfio_dirty_status_cmd(pds_vfio, 0, &max_regions,
+					&num_regions);
+	if (err < 0) {
+		dev_err(&pdev->dev, "Failed to get dirty status, err %pe\n",
+			ERR_PTR(err));
+		return err;
+	} else if (num_regions) {
+		dev_err(&pdev->dev,
+			"Dirty tracking already enabled for %d regions\n",
+			num_regions);
+		return -EEXIST;
+	} else if (!max_regions) {
+		dev_err(&pdev->dev,
+			"Device doesn't support dirty tracking, max_regions %d\n",
+			max_regions);
+		return -EOPNOTSUPP;
+	}
+
+	/*
+	 * Only support 1 region for now. If there are any large gaps in the
+	 * VM's address regions, then this would be a waste of memory as we are
+	 * generating 2 bitmaps (ack/seq) from the min address to the max
+	 * address of the VM's address regions. In the future, if we support
+	 * more than one region in the device/driver we can split the bitmaps
+	 * on the largest address region gaps. We can do this split up to the
+	 * max_regions times returned from the dirty_status command.
+	 */
+	max_regions = 1;
+	if (num_ranges > max_regions) {
+		vfio_combine_iova_ranges(ranges, nnodes, max_regions);
+		num_ranges = max_regions;
+	}
+
+	node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
+	if (!node)
+		return -EINVAL;
+
+	region_size = node->last - node->start + 1;
+	region_start = node->start;
+	region_page_size = *page_size;
+
+	len = sizeof(*region_info);
+	region_info = kzalloc(len, GFP_KERNEL);
+	if (!region_info)
+		return -ENOMEM;
+
+	page_count = DIV_ROUND_UP(region_size, region_page_size);
+
+	region_info->dma_base = cpu_to_le64(region_start);
+	region_info->page_count = cpu_to_le32(page_count);
+	region_info->page_size_log2 = ilog2(region_page_size);
+
+	regions_dma = dma_map_single(pdsc_dev, (void *)region_info, len,
+				     DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(pdsc_dev, regions_dma)) {
+		err = -ENOMEM;
+		goto out_free_region_info;
+	}
+
+	err = pds_vfio_dirty_enable_cmd(pds_vfio, regions_dma, max_regions);
+	dma_unmap_single(pdsc_dev, regions_dma, len, DMA_BIDIRECTIONAL);
+	if (err)
+		goto out_free_region_info;
+
+	/*
+	 * page_count might be adjusted by the device,
+	 * update it before freeing region_info DMA
+	 */
+	page_count = le32_to_cpu(region_info->page_count);
+
+	dev_dbg(&pdev->dev,
+		"region_info: regions_dma 0x%llx dma_base 0x%llx page_count %u page_size_log2 %u\n",
+		regions_dma, region_start, page_count,
+		(u8)ilog2(region_page_size));
+
+	err = pds_vfio_dirty_alloc_bitmaps(dirty, page_count / BITS_PER_BYTE);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to alloc dirty bitmaps: %pe\n",
+			ERR_PTR(err));
+		goto out_free_region_info;
+	}
+
+	err = pds_vfio_dirty_alloc_sgl(pds_vfio, page_count);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to alloc dirty sg lists: %pe\n",
+			ERR_PTR(err));
+		goto out_free_bitmaps;
+	}
+
+	dirty->region_start = region_start;
+	dirty->region_size = region_size;
+	dirty->region_page_size = region_page_size;
+	pds_vfio_dirty_set_enabled(pds_vfio);
+
+	pds_vfio_print_guest_region_info(pds_vfio, max_regions);
+
+	kfree(region_info);
+
+	return 0;
+
+out_free_bitmaps:
+	pds_vfio_dirty_free_bitmaps(dirty);
+out_free_region_info:
+	kfree(region_info);
+	return err;
+}
+
+void pds_vfio_dirty_disable(struct pds_vfio_pci_device *pds_vfio, bool send_cmd)
+{
+	if (pds_vfio_dirty_is_enabled(pds_vfio)) {
+		pds_vfio_dirty_set_disabled(pds_vfio);
+		if (send_cmd)
+			pds_vfio_dirty_disable_cmd(pds_vfio);
+		pds_vfio_dirty_free_sgl(pds_vfio);
+		pds_vfio_dirty_free_bitmaps(&pds_vfio->dirty);
+	}
+
+	if (send_cmd)
+		pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_NONE);
+}
+
+static int pds_vfio_dirty_seq_ack(struct pds_vfio_pci_device *pds_vfio,
+				  struct pds_vfio_bmp_info *bmp_info,
+				  u32 offset, u32 bmp_bytes, bool read_seq)
+{
+	const char *bmp_type_str = read_seq ? "read_seq" : "write_ack";
+	u8 dma_dir = read_seq ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+	struct pci_dev *pdev = pds_vfio->vfio_coredev.pdev;
+	struct device *pdsc_dev = &pci_physfn(pdev)->dev;
+	unsigned long long npages;
+	struct sg_table sg_table;
+	struct scatterlist *sg;
+	struct page **pages;
+	u32 page_offset;
+	const void *bmp;
+	size_t size;
+	u16 num_sge;
+	int err;
+	int i;
+
+	bmp = (void *)((u64)bmp_info->bmp + offset);
+	page_offset = offset_in_page(bmp);
+	bmp -= page_offset;
+
+	/*
+	 * Start and end of bitmap section to seq/ack might not be page
+	 * aligned, so use the page_offset to account for that so there
+	 * will be enough pages to represent the bmp_bytes
+	 */
+	npages = DIV_ROUND_UP_ULL(bmp_bytes + page_offset, PAGE_SIZE);
+	pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
+	if (!pages)
+		return -ENOMEM;
+
+	for (unsigned long long i = 0; i < npages; i++) {
+		struct page *page = vmalloc_to_page(bmp);
+
+		if (!page) {
+			err = -EFAULT;
+			goto out_free_pages;
+		}
+
+		pages[i] = page;
+		bmp += PAGE_SIZE;
+	}
+
+	err = sg_alloc_table_from_pages(&sg_table, pages, npages, page_offset,
+					bmp_bytes, GFP_KERNEL);
+	if (err)
+		goto out_free_pages;
+
+	err = dma_map_sgtable(pdsc_dev, &sg_table, dma_dir, 0);
+	if (err)
+		goto out_free_sg_table;
+
+	for_each_sgtable_dma_sg(&sg_table, sg, i) {
+		struct pds_lm_sg_elem *sg_elem = &bmp_info->sgl[i];
+
+		sg_elem->addr = cpu_to_le64(sg_dma_address(sg));
+		sg_elem->len = cpu_to_le32(sg_dma_len(sg));
+	}
+
+	num_sge = sg_table.nents;
+	size = num_sge * sizeof(struct pds_lm_sg_elem);
+	dma_sync_single_for_device(pdsc_dev, bmp_info->sgl_addr, size, dma_dir);
+	err = pds_vfio_dirty_seq_ack_cmd(pds_vfio, bmp_info->sgl_addr, num_sge,
+					 offset, bmp_bytes, read_seq);
+	if (err)
+		dev_err(&pdev->dev,
+			"Dirty bitmap %s failed offset %u bmp_bytes %u num_sge %u DMA 0x%llx: %pe\n",
+			bmp_type_str, offset, bmp_bytes,
+			num_sge, bmp_info->sgl_addr, ERR_PTR(err));
+	dma_sync_single_for_cpu(pdsc_dev, bmp_info->sgl_addr, size, dma_dir);
+
+	dma_unmap_sgtable(pdsc_dev, &sg_table, dma_dir, 0);
+out_free_sg_table:
+	sg_free_table(&sg_table);
+out_free_pages:
+	kfree(pages);
+
+	return err;
+}
+
+static int pds_vfio_dirty_write_ack(struct pds_vfio_pci_device *pds_vfio,
+				    u32 offset, u32 len)
+{
+	return pds_vfio_dirty_seq_ack(pds_vfio, &pds_vfio->dirty.host_ack,
+				      offset, len, WRITE_ACK);
+}
+
+static int pds_vfio_dirty_read_seq(struct pds_vfio_pci_device *pds_vfio,
+				   u32 offset, u32 len)
+{
+	return pds_vfio_dirty_seq_ack(pds_vfio, &pds_vfio->dirty.host_seq,
+				      offset, len, READ_SEQ);
+}
+
+static int pds_vfio_dirty_process_bitmaps(struct pds_vfio_pci_device *pds_vfio,
+					  struct iova_bitmap *dirty_bitmap,
+					  u32 bmp_offset, u32 len_bytes)
+{
+	u64 page_size = pds_vfio->dirty.region_page_size;
+	u64 region_start = pds_vfio->dirty.region_start;
+	u32 bmp_offset_bit;
+	__le64 *seq, *ack;
+	int dword_count;
+
+	dword_count = len_bytes / sizeof(u64);
+	seq = (__le64 *)((u64)pds_vfio->dirty.host_seq.bmp + bmp_offset);
+	ack = (__le64 *)((u64)pds_vfio->dirty.host_ack.bmp + bmp_offset);
+	bmp_offset_bit = bmp_offset * 8;
+
+	for (int i = 0; i < dword_count; i++) {
+		u64 xor = le64_to_cpu(seq[i]) ^ le64_to_cpu(ack[i]);
+
+		/* prepare for next write_ack call */
+		ack[i] = seq[i];
+
+		for (u8 bit_i = 0; bit_i < BITS_PER_TYPE(u64); ++bit_i) {
+			if (xor & BIT(bit_i)) {
+				u64 abs_bit_i = bmp_offset_bit +
+						i * BITS_PER_TYPE(u64) + bit_i;
+				u64 addr = abs_bit_i * page_size + region_start;
+
+				iova_bitmap_set(dirty_bitmap, addr, page_size);
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int pds_vfio_dirty_sync(struct pds_vfio_pci_device *pds_vfio,
+			       struct iova_bitmap *dirty_bitmap,
+			       unsigned long iova, unsigned long length)
+{
+	struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
+	struct pds_vfio_dirty *dirty = &pds_vfio->dirty;
+	u64 bmp_offset, bmp_bytes;
+	u64 bitmap_size, pages;
+	int err;
+
+	dev_dbg(dev, "vf%u: Get dirty page bitmap\n", pds_vfio->vf_id);
+
+	if (!pds_vfio_dirty_is_enabled(pds_vfio)) {
+		dev_err(dev, "vf%u: Sync failed, dirty tracking is disabled\n",
+			pds_vfio->vf_id);
+		return -EINVAL;
+	}
+
+	pages = DIV_ROUND_UP(length, pds_vfio->dirty.region_page_size);
+	bitmap_size =
+		round_up(pages, sizeof(u64) * BITS_PER_BYTE) / BITS_PER_BYTE;
+
+	dev_dbg(dev,
+		"vf%u: iova 0x%lx length %lu page_size %llu pages %llu bitmap_size %llu\n",
+		pds_vfio->vf_id, iova, length, pds_vfio->dirty.region_page_size,
+		pages, bitmap_size);
+
+	if (!length || ((dirty->region_start + iova + length) >
+			(dirty->region_start + dirty->region_size))) {
+		dev_err(dev, "Invalid iova 0x%lx and/or length 0x%lx to sync\n",
+			iova, length);
+		return -EINVAL;
+	}
+
+	/* bitmap is modified in 64 bit chunks */
+	bmp_bytes = ALIGN(DIV_ROUND_UP(length / dirty->region_page_size,
+				       sizeof(u64)),
+			  sizeof(u64));
+	if (bmp_bytes != bitmap_size) {
+		dev_err(dev,
+			"Calculated bitmap bytes %llu not equal to bitmap size %llu\n",
+			bmp_bytes, bitmap_size);
+		return -EINVAL;
+	}
+
+	bmp_offset = DIV_ROUND_UP(iova / dirty->region_page_size, sizeof(u64));
+
+	dev_dbg(dev,
+		"Syncing dirty bitmap, iova 0x%lx length 0x%lx, bmp_offset %llu bmp_bytes %llu\n",
+		iova, length, bmp_offset, bmp_bytes);
+
+	err = pds_vfio_dirty_read_seq(pds_vfio, bmp_offset, bmp_bytes);
+	if (err)
+		return err;
+
+	err = pds_vfio_dirty_process_bitmaps(pds_vfio, dirty_bitmap, bmp_offset,
+					     bmp_bytes);
+	if (err)
+		return err;
+
+	err = pds_vfio_dirty_write_ack(pds_vfio, bmp_offset, bmp_bytes);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+int pds_vfio_dma_logging_report(struct vfio_device *vdev, unsigned long iova,
+				unsigned long length, struct iova_bitmap *dirty)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+	int err;
+
+	mutex_lock(&pds_vfio->state_mutex);
+	err = pds_vfio_dirty_sync(pds_vfio, dirty, iova, length);
+	pds_vfio_state_mutex_unlock(pds_vfio);
+
+	return err;
+}
+
+int pds_vfio_dma_logging_start(struct vfio_device *vdev,
+			       struct rb_root_cached *ranges, u32 nnodes,
+			       u64 *page_size)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+	int err;
+
+	mutex_lock(&pds_vfio->state_mutex);
+	pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_IN_PROGRESS);
+	err = pds_vfio_dirty_enable(pds_vfio, ranges, nnodes, page_size);
+	pds_vfio_state_mutex_unlock(pds_vfio);
+
+	return err;
+}
+
+int pds_vfio_dma_logging_stop(struct vfio_device *vdev)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+
+	mutex_lock(&pds_vfio->state_mutex);
+	pds_vfio_dirty_disable(pds_vfio, true);
+	pds_vfio_state_mutex_unlock(pds_vfio);
+
+	return 0;
+}
diff --git a/drivers/vfio/pci/pds/dirty.h b/drivers/vfio/pci/pds/dirty.h
new file mode 100644
index 000000000000..f78da25d75ca
--- /dev/null
+++ b/drivers/vfio/pci/pds/dirty.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _DIRTY_H_
+#define _DIRTY_H_
+
+struct pds_vfio_bmp_info {
+	unsigned long *bmp;
+	u32 bmp_bytes;
+	struct pds_lm_sg_elem *sgl;
+	dma_addr_t sgl_addr;
+	u16 num_sge;
+};
+
+struct pds_vfio_dirty {
+	struct pds_vfio_bmp_info host_seq;
+	struct pds_vfio_bmp_info host_ack;
+	u64 region_size;
+	u64 region_start;
+	u64 region_page_size;
+	bool is_enabled;
+};
+
+struct pds_vfio_pci_device;
+
+bool pds_vfio_dirty_is_enabled(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_dirty_set_enabled(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_dirty_set_disabled(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_dirty_disable(struct pds_vfio_pci_device *pds_vfio,
+			    bool send_cmd);
+
+int pds_vfio_dma_logging_report(struct vfio_device *vdev, unsigned long iova,
+				unsigned long length,
+				struct iova_bitmap *dirty);
+int pds_vfio_dma_logging_start(struct vfio_device *vdev,
+			       struct rb_root_cached *ranges, u32 nnodes,
+			       u64 *page_size);
+int pds_vfio_dma_logging_stop(struct vfio_device *vdev);
+#endif /* _DIRTY_H_ */
diff --git a/drivers/vfio/pci/pds/lm.c b/drivers/vfio/pci/pds/lm.c
new file mode 100644
index 000000000000..79fe2e66bb49
--- /dev/null
+++ b/drivers/vfio/pci/pds/lm.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/vfio.h>
+#include <linux/vfio_pci_core.h>
+
+#include "vfio_dev.h"
+#include "cmds.h"
+
+static struct pds_vfio_lm_file *
+pds_vfio_get_lm_file(const struct file_operations *fops, int flags, u64 size)
+{
+	struct pds_vfio_lm_file *lm_file = NULL;
+	unsigned long long npages;
+	struct page **pages;
+	void *page_mem;
+	const void *p;
+
+	if (!size)
+		return NULL;
+
+	/* Alloc file structure */
+	lm_file = kzalloc(sizeof(*lm_file), GFP_KERNEL);
+	if (!lm_file)
+		return NULL;
+
+	/* Create file */
+	lm_file->filep =
+		anon_inode_getfile("pds_vfio_lm", fops, lm_file, flags);
+	if (IS_ERR(lm_file->filep))
+		goto out_free_file;
+
+	stream_open(lm_file->filep->f_inode, lm_file->filep);
+	mutex_init(&lm_file->lock);
+
+	/* prevent file from being released before we are done with it */
+	get_file(lm_file->filep);
+
+	/* Allocate memory for file pages */
+	npages = DIV_ROUND_UP_ULL(size, PAGE_SIZE);
+	pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL);
+	if (!pages)
+		goto out_put_file;
+
+	page_mem = kvzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
+	if (!page_mem)
+		goto out_free_pages_array;
+
+	p = page_mem - offset_in_page(page_mem);
+	for (unsigned long long i = 0; i < npages; i++) {
+		if (is_vmalloc_addr(p))
+			pages[i] = vmalloc_to_page(p);
+		else
+			pages[i] = kmap_to_page((void *)p);
+		if (!pages[i])
+			goto out_free_page_mem;
+
+		p += PAGE_SIZE;
+	}
+
+	/* Create scatterlist of file pages to use for DMA mapping later */
+	if (sg_alloc_table_from_pages(&lm_file->sg_table, pages, npages, 0,
+				      size, GFP_KERNEL))
+		goto out_free_page_mem;
+
+	lm_file->size = size;
+	lm_file->pages = pages;
+	lm_file->npages = npages;
+	lm_file->page_mem = page_mem;
+	lm_file->alloc_size = npages * PAGE_SIZE;
+
+	return lm_file;
+
+out_free_page_mem:
+	kvfree(page_mem);
+out_free_pages_array:
+	kfree(pages);
+out_put_file:
+	fput(lm_file->filep);
+	mutex_destroy(&lm_file->lock);
+out_free_file:
+	kfree(lm_file);
+
+	return NULL;
+}
+
+static void pds_vfio_put_lm_file(struct pds_vfio_lm_file *lm_file)
+{
+	mutex_lock(&lm_file->lock);
+
+	lm_file->size = 0;
+	lm_file->alloc_size = 0;
+
+	/* Free scatter list of file pages */
+	sg_free_table(&lm_file->sg_table);
+
+	kvfree(lm_file->page_mem);
+	lm_file->page_mem = NULL;
+	kfree(lm_file->pages);
+	lm_file->pages = NULL;
+
+	mutex_unlock(&lm_file->lock);
+
+	/* allow file to be released since we are done with it */
+	fput(lm_file->filep);
+}
+
+void pds_vfio_put_save_file(struct pds_vfio_pci_device *pds_vfio)
+{
+	if (!pds_vfio->save_file)
+		return;
+
+	pds_vfio_put_lm_file(pds_vfio->save_file);
+	pds_vfio->save_file = NULL;
+}
+
+void pds_vfio_put_restore_file(struct pds_vfio_pci_device *pds_vfio)
+{
+	if (!pds_vfio->restore_file)
+		return;
+
+	pds_vfio_put_lm_file(pds_vfio->restore_file);
+	pds_vfio->restore_file = NULL;
+}
+
+static struct page *pds_vfio_get_file_page(struct pds_vfio_lm_file *lm_file,
+					   unsigned long offset)
+{
+	unsigned long cur_offset = 0;
+	struct scatterlist *sg;
+	unsigned int i;
+
+	/* All accesses are sequential */
+	if (offset < lm_file->last_offset || !lm_file->last_offset_sg) {
+		lm_file->last_offset = 0;
+		lm_file->last_offset_sg = lm_file->sg_table.sgl;
+		lm_file->sg_last_entry = 0;
+	}
+
+	cur_offset = lm_file->last_offset;
+
+	for_each_sg(lm_file->last_offset_sg, sg,
+		    lm_file->sg_table.orig_nents - lm_file->sg_last_entry, i) {
+		if (offset < sg->length + cur_offset) {
+			lm_file->last_offset_sg = sg;
+			lm_file->sg_last_entry += i;
+			lm_file->last_offset = cur_offset;
+			return nth_page(sg_page(sg),
+					(offset - cur_offset) / PAGE_SIZE);
+		}
+		cur_offset += sg->length;
+	}
+
+	return NULL;
+}
+
+static int pds_vfio_release_file(struct inode *inode, struct file *filp)
+{
+	struct pds_vfio_lm_file *lm_file = filp->private_data;
+
+	mutex_lock(&lm_file->lock);
+	lm_file->filep->f_pos = 0;
+	lm_file->size = 0;
+	mutex_unlock(&lm_file->lock);
+	mutex_destroy(&lm_file->lock);
+	kfree(lm_file);
+
+	return 0;
+}
+
+static ssize_t pds_vfio_save_read(struct file *filp, char __user *buf,
+				  size_t len, loff_t *pos)
+{
+	struct pds_vfio_lm_file *lm_file = filp->private_data;
+	ssize_t done = 0;
+
+	if (pos)
+		return -ESPIPE;
+	pos = &filp->f_pos;
+
+	mutex_lock(&lm_file->lock);
+	if (*pos > lm_file->size) {
+		done = -EINVAL;
+		goto out_unlock;
+	}
+
+	len = min_t(size_t, lm_file->size - *pos, len);
+	while (len) {
+		size_t page_offset;
+		struct page *page;
+		size_t page_len;
+		u8 *from_buff;
+		int err;
+
+		page_offset = (*pos) % PAGE_SIZE;
+		page = pds_vfio_get_file_page(lm_file, *pos - page_offset);
+		if (!page) {
+			if (done == 0)
+				done = -EINVAL;
+			goto out_unlock;
+		}
+
+		page_len = min_t(size_t, len, PAGE_SIZE - page_offset);
+		from_buff = kmap_local_page(page);
+		err = copy_to_user(buf, from_buff + page_offset, page_len);
+		kunmap_local(from_buff);
+		if (err) {
+			done = -EFAULT;
+			goto out_unlock;
+		}
+		*pos += page_len;
+		len -= page_len;
+		done += page_len;
+		buf += page_len;
+	}
+
+out_unlock:
+	mutex_unlock(&lm_file->lock);
+	return done;
+}
+
+static const struct file_operations pds_vfio_save_fops = {
+	.owner = THIS_MODULE,
+	.read = pds_vfio_save_read,
+	.release = pds_vfio_release_file,
+	.llseek = no_llseek,
+};
+
+static int pds_vfio_get_save_file(struct pds_vfio_pci_device *pds_vfio)
+{
+	struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
+	struct pds_vfio_lm_file *lm_file;
+	u64 size;
+	int err;
+
+	/* Get live migration state size in this state */
+	err = pds_vfio_get_lm_state_size_cmd(pds_vfio, &size);
+	if (err) {
+		dev_err(dev, "failed to get save status: %pe\n", ERR_PTR(err));
+		return err;
+	}
+
+	dev_dbg(dev, "save status, size = %lld\n", size);
+
+	if (!size) {
+		dev_err(dev, "invalid state size\n");
+		return -EIO;
+	}
+
+	lm_file = pds_vfio_get_lm_file(&pds_vfio_save_fops, O_RDONLY, size);
+	if (!lm_file) {
+		dev_err(dev, "failed to create save file\n");
+		return -ENOENT;
+	}
+
+	dev_dbg(dev, "size = %lld, alloc_size = %lld, npages = %lld\n",
+		lm_file->size, lm_file->alloc_size, lm_file->npages);
+
+	pds_vfio->save_file = lm_file;
+
+	return 0;
+}
+
+static ssize_t pds_vfio_restore_write(struct file *filp, const char __user *buf,
+				      size_t len, loff_t *pos)
+{
+	struct pds_vfio_lm_file *lm_file = filp->private_data;
+	loff_t requested_length;
+	ssize_t done = 0;
+
+	if (pos)
+		return -ESPIPE;
+
+	pos = &filp->f_pos;
+
+	if (*pos < 0 ||
+	    check_add_overflow((loff_t)len, *pos, &requested_length))
+		return -EINVAL;
+
+	mutex_lock(&lm_file->lock);
+
+	while (len) {
+		size_t page_offset;
+		struct page *page;
+		size_t page_len;
+		u8 *to_buff;
+		int err;
+
+		page_offset = (*pos) % PAGE_SIZE;
+		page = pds_vfio_get_file_page(lm_file, *pos - page_offset);
+		if (!page) {
+			if (done == 0)
+				done = -EINVAL;
+			goto out_unlock;
+		}
+
+		page_len = min_t(size_t, len, PAGE_SIZE - page_offset);
+		to_buff = kmap_local_page(page);
+		err = copy_from_user(to_buff + page_offset, buf, page_len);
+		kunmap_local(to_buff);
+		if (err) {
+			done = -EFAULT;
+			goto out_unlock;
+		}
+		*pos += page_len;
+		len -= page_len;
+		done += page_len;
+		buf += page_len;
+		lm_file->size += page_len;
+	}
+out_unlock:
+	mutex_unlock(&lm_file->lock);
+	return done;
+}
+
+static const struct file_operations pds_vfio_restore_fops = {
+	.owner = THIS_MODULE,
+	.write = pds_vfio_restore_write,
+	.release = pds_vfio_release_file,
+	.llseek = no_llseek,
+};
+
+static int pds_vfio_get_restore_file(struct pds_vfio_pci_device *pds_vfio)
+{
+	struct device *dev = &pds_vfio->vfio_coredev.pdev->dev;
+	struct pds_vfio_lm_file *lm_file;
+	u64 size;
+
+	size = sizeof(union pds_lm_dev_state);
+	dev_dbg(dev, "restore status, size = %lld\n", size);
+
+	if (!size) {
+		dev_err(dev, "invalid state size");
+		return -EIO;
+	}
+
+	lm_file = pds_vfio_get_lm_file(&pds_vfio_restore_fops, O_WRONLY, size);
+	if (!lm_file) {
+		dev_err(dev, "failed to create restore file");
+		return -ENOENT;
+	}
+	pds_vfio->restore_file = lm_file;
+
+	return 0;
+}
+
+struct file *
+pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
+				  enum vfio_device_mig_state next)
+{
+	enum vfio_device_mig_state cur = pds_vfio->state;
+	int err;
+
+	if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_STOP_COPY) {
+		err = pds_vfio_get_save_file(pds_vfio);
+		if (err)
+			return ERR_PTR(err);
+
+		err = pds_vfio_get_lm_state_cmd(pds_vfio);
+		if (err) {
+			pds_vfio_put_save_file(pds_vfio);
+			return ERR_PTR(err);
+		}
+
+		return pds_vfio->save_file->filep;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_STOP_COPY && next == VFIO_DEVICE_STATE_STOP) {
+		pds_vfio_put_save_file(pds_vfio);
+		pds_vfio_dirty_disable(pds_vfio, true);
+		return NULL;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_RESUMING) {
+		err = pds_vfio_get_restore_file(pds_vfio);
+		if (err)
+			return ERR_PTR(err);
+
+		return pds_vfio->restore_file->filep;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_RESUMING && next == VFIO_DEVICE_STATE_STOP) {
+		err = pds_vfio_set_lm_state_cmd(pds_vfio);
+		if (err)
+			return ERR_PTR(err);
+
+		pds_vfio_put_restore_file(pds_vfio);
+		return NULL;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_RUNNING && next == VFIO_DEVICE_STATE_RUNNING_P2P) {
+		pds_vfio_send_host_vf_lm_status_cmd(pds_vfio,
+						    PDS_LM_STA_IN_PROGRESS);
+		err = pds_vfio_suspend_device_cmd(pds_vfio,
+						  PDS_LM_SUSPEND_RESUME_TYPE_P2P);
+		if (err)
+			return ERR_PTR(err);
+
+		return NULL;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && next == VFIO_DEVICE_STATE_RUNNING) {
+		err = pds_vfio_resume_device_cmd(pds_vfio,
+						 PDS_LM_SUSPEND_RESUME_TYPE_FULL);
+		if (err)
+			return ERR_PTR(err);
+
+		pds_vfio_send_host_vf_lm_status_cmd(pds_vfio, PDS_LM_STA_NONE);
+		return NULL;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_STOP && next == VFIO_DEVICE_STATE_RUNNING_P2P) {
+		err = pds_vfio_resume_device_cmd(pds_vfio,
+						 PDS_LM_SUSPEND_RESUME_TYPE_P2P);
+		if (err)
+			return ERR_PTR(err);
+
+		return NULL;
+	}
+
+	if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && next == VFIO_DEVICE_STATE_STOP) {
+		err = pds_vfio_suspend_device_cmd(pds_vfio,
+						  PDS_LM_SUSPEND_RESUME_TYPE_FULL);
+		if (err)
+			return ERR_PTR(err);
+		return NULL;
+	}
+
+	return ERR_PTR(-EINVAL);
+}
diff --git a/drivers/vfio/pci/pds/lm.h b/drivers/vfio/pci/pds/lm.h
new file mode 100644
index 000000000000..13be893198b7
--- /dev/null
+++ b/drivers/vfio/pci/pds/lm.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _LM_H_
+#define _LM_H_
+
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+#include <linux/types.h>
+
+#include <linux/pds/pds_common.h>
+#include <linux/pds/pds_adminq.h>
+
+struct pds_vfio_lm_file {
+	struct file *filep;
+	struct mutex lock;	/* protect live migration data file */
+	u64 size;		/* Size with valid data */
+	u64 alloc_size;		/* Total allocated size. Always >= len */
+	void *page_mem;		/* memory allocated for pages */
+	struct page **pages;	/* Backing pages for file */
+	unsigned long long npages;
+	struct sg_table sg_table;	/* SG table for backing pages */
+	struct pds_lm_sg_elem *sgl;	/* DMA mapping */
+	dma_addr_t sgl_addr;
+	u16 num_sge;
+	struct scatterlist *last_offset_sg;	/* Iterator */
+	unsigned int sg_last_entry;
+	unsigned long last_offset;
+};
+
+struct pds_vfio_pci_device;
+
+struct file *
+pds_vfio_step_device_state_locked(struct pds_vfio_pci_device *pds_vfio,
+				  enum vfio_device_mig_state next);
+
+void pds_vfio_put_save_file(struct pds_vfio_pci_device *pds_vfio);
+void pds_vfio_put_restore_file(struct pds_vfio_pci_device *pds_vfio);
+
+#endif /* _LM_H_ */
diff --git a/drivers/vfio/pci/pds/pci_drv.c b/drivers/vfio/pci/pds/pci_drv.c
new file mode 100644
index 000000000000..ab4b5958e413
--- /dev/null
+++ b/drivers/vfio/pci/pds/pci_drv.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+
+#include <linux/pds/pds_common.h>
+#include <linux/pds/pds_core_if.h>
+#include <linux/pds/pds_adminq.h>
+
+#include "vfio_dev.h"
+#include "pci_drv.h"
+#include "cmds.h"
+
+#define PDS_VFIO_DRV_DESCRIPTION	"AMD/Pensando VFIO Device Driver"
+#define PCI_VENDOR_ID_PENSANDO		0x1dd8
+
+static void pds_vfio_recovery(struct pds_vfio_pci_device *pds_vfio)
+{
+	bool deferred_reset_needed = false;
+
+	/*
+	 * Documentation states that the kernel migration driver must not
+	 * generate asynchronous device state transitions outside of
+	 * manipulation by the user or the VFIO_DEVICE_RESET ioctl.
+	 *
+	 * Since recovery is an asynchronous event received from the device,
+	 * initiate a deferred reset. Issue a deferred reset in the following
+	 * situations:
+	 *   1. Migration is in progress, which will cause the next step of
+	 *	the migration to fail.
+	 *   2. If the device is in a state that will be set to
+	 *	VFIO_DEVICE_STATE_RUNNING on the next action (i.e. VM is
+	 *	shutdown and device is in VFIO_DEVICE_STATE_STOP).
+	 */
+	mutex_lock(&pds_vfio->state_mutex);
+	if ((pds_vfio->state != VFIO_DEVICE_STATE_RUNNING &&
+	     pds_vfio->state != VFIO_DEVICE_STATE_ERROR) ||
+	    (pds_vfio->state == VFIO_DEVICE_STATE_RUNNING &&
+	     pds_vfio_dirty_is_enabled(pds_vfio)))
+		deferred_reset_needed = true;
+	mutex_unlock(&pds_vfio->state_mutex);
+
+	/*
+	 * On the next user initiated state transition, the device will
+	 * transition to the VFIO_DEVICE_STATE_ERROR. At this point it's the user's
+	 * responsibility to reset the device.
+	 *
+	 * If a VFIO_DEVICE_RESET is requested post recovery and before the next
+	 * state transition, then the deferred reset state will be set to
+	 * VFIO_DEVICE_STATE_RUNNING.
+	 */
+	if (deferred_reset_needed) {
+		spin_lock(&pds_vfio->reset_lock);
+		pds_vfio->deferred_reset = true;
+		pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_ERROR;
+		spin_unlock(&pds_vfio->reset_lock);
+	}
+}
+
+static int pds_vfio_pci_notify_handler(struct notifier_block *nb,
+				       unsigned long ecode, void *data)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(nb, struct pds_vfio_pci_device, nb);
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	union pds_core_notifyq_comp *event = data;
+
+	dev_dbg(dev, "%s: event code %lu\n", __func__, ecode);
+
+	/*
+	 * We don't need to do anything for RESET state==0 as there is no notify
+	 * or feedback mechanism available, and it is possible that we won't
+	 * even see a state==0 event since the pds_core recovery is pending.
+	 *
+	 * Any requests from VFIO while state==0 will fail, which will return
+	 * error and may cause migration to fail.
+	 */
+	if (ecode == PDS_EVENT_RESET) {
+		dev_info(dev, "%s: PDS_EVENT_RESET event received, state==%d\n",
+			 __func__, event->reset.state);
+		/*
+		 * pds_core device finished recovery and sent us the
+		 * notification (state == 1) to allow us to recover
+		 */
+		if (event->reset.state == 1)
+			pds_vfio_recovery(pds_vfio);
+	}
+
+	return 0;
+}
+
+static int
+pds_vfio_pci_register_event_handler(struct pds_vfio_pci_device *pds_vfio)
+{
+	struct device *dev = pds_vfio_to_dev(pds_vfio);
+	struct notifier_block *nb = &pds_vfio->nb;
+	int err;
+
+	if (!nb->notifier_call) {
+		nb->notifier_call = pds_vfio_pci_notify_handler;
+		err = pdsc_register_notify(nb);
+		if (err) {
+			nb->notifier_call = NULL;
+			dev_err(dev,
+				"failed to register pds event handler: %pe\n",
+				ERR_PTR(err));
+			return -EINVAL;
+		}
+		dev_dbg(dev, "pds event handler registered\n");
+	}
+
+	return 0;
+}
+
+static void
+pds_vfio_pci_unregister_event_handler(struct pds_vfio_pci_device *pds_vfio)
+{
+	if (pds_vfio->nb.notifier_call) {
+		pdsc_unregister_notify(&pds_vfio->nb);
+		pds_vfio->nb.notifier_call = NULL;
+	}
+}
+
+static int pds_vfio_pci_probe(struct pci_dev *pdev,
+			      const struct pci_device_id *id)
+{
+	struct pds_vfio_pci_device *pds_vfio;
+	int err;
+
+	pds_vfio = vfio_alloc_device(pds_vfio_pci_device, vfio_coredev.vdev,
+				     &pdev->dev, pds_vfio_ops_info());
+	if (IS_ERR(pds_vfio))
+		return PTR_ERR(pds_vfio);
+
+	dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev);
+
+	err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev);
+	if (err)
+		goto out_put_vdev;
+
+	err = pds_vfio_register_client_cmd(pds_vfio);
+	if (err) {
+		dev_err(&pdev->dev, "failed to register as client: %pe\n",
+			ERR_PTR(err));
+		goto out_unregister_coredev;
+	}
+
+	err = pds_vfio_pci_register_event_handler(pds_vfio);
+	if (err)
+		goto out_unregister_client;
+
+	return 0;
+
+out_unregister_client:
+	pds_vfio_unregister_client_cmd(pds_vfio);
+out_unregister_coredev:
+	vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);
+out_put_vdev:
+	vfio_put_device(&pds_vfio->vfio_coredev.vdev);
+	return err;
+}
+
+static void pds_vfio_pci_remove(struct pci_dev *pdev)
+{
+	struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);
+
+	pds_vfio_pci_unregister_event_handler(pds_vfio);
+	pds_vfio_unregister_client_cmd(pds_vfio);
+	vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);
+	vfio_put_device(&pds_vfio->vfio_coredev.vdev);
+}
+
+static const struct pci_device_id pds_vfio_pci_table[] = {
+	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_PENSANDO, 0x1003) }, /* Ethernet VF */
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, pds_vfio_pci_table);
+
+static void pds_vfio_pci_aer_reset_done(struct pci_dev *pdev)
+{
+	struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);
+
+	pds_vfio_reset(pds_vfio);
+}
+
+static const struct pci_error_handlers pds_vfio_pci_err_handlers = {
+	.reset_done = pds_vfio_pci_aer_reset_done,
+	.error_detected = vfio_pci_core_aer_err_detected,
+};
+
+static struct pci_driver pds_vfio_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = pds_vfio_pci_table,
+	.probe = pds_vfio_pci_probe,
+	.remove = pds_vfio_pci_remove,
+	.err_handler = &pds_vfio_pci_err_handlers,
+	.driver_managed_dma = true,
+};
+
+module_pci_driver(pds_vfio_pci_driver);
+
+MODULE_DESCRIPTION(PDS_VFIO_DRV_DESCRIPTION);
+MODULE_AUTHOR("Brett Creeley <brett.creeley@amd.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/vfio/pci/pds/pci_drv.h b/drivers/vfio/pci/pds/pci_drv.h
new file mode 100644
index 000000000000..e79bed12ed14
--- /dev/null
+++ b/drivers/vfio/pci/pds/pci_drv.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _PCI_DRV_H
+#define _PCI_DRV_H
+
+#include <linux/pci.h>
+
+#endif /* _PCI_DRV_H */
diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
new file mode 100644
index 000000000000..b46174f5eb09
--- /dev/null
+++ b/drivers/vfio/pci/pds/vfio_dev.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#include <linux/vfio.h>
+#include <linux/vfio_pci_core.h>
+
+#include "lm.h"
+#include "dirty.h"
+#include "vfio_dev.h"
+
+struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio)
+{
+	return pds_vfio->vfio_coredev.pdev;
+}
+
+struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio)
+{
+	return &pds_vfio_to_pci_dev(pds_vfio)->dev;
+}
+
+struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)
+{
+	struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);
+
+	return container_of(core_device, struct pds_vfio_pci_device,
+			    vfio_coredev);
+}
+
+void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio)
+{
+again:
+	spin_lock(&pds_vfio->reset_lock);
+	if (pds_vfio->deferred_reset) {
+		pds_vfio->deferred_reset = false;
+		if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) {
+			pds_vfio_put_restore_file(pds_vfio);
+			pds_vfio_put_save_file(pds_vfio);
+			pds_vfio_dirty_disable(pds_vfio, false);
+		}
+		pds_vfio->state = pds_vfio->deferred_reset_state;
+		pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
+		spin_unlock(&pds_vfio->reset_lock);
+		goto again;
+	}
+	mutex_unlock(&pds_vfio->state_mutex);
+	spin_unlock(&pds_vfio->reset_lock);
+}
+
+void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio)
+{
+	spin_lock(&pds_vfio->reset_lock);
+	pds_vfio->deferred_reset = true;
+	pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
+	if (!mutex_trylock(&pds_vfio->state_mutex)) {
+		spin_unlock(&pds_vfio->reset_lock);
+		return;
+	}
+	spin_unlock(&pds_vfio->reset_lock);
+	pds_vfio_state_mutex_unlock(pds_vfio);
+}
+
+static struct file *
+pds_vfio_set_device_state(struct vfio_device *vdev,
+			  enum vfio_device_mig_state new_state)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+	struct file *res = NULL;
+
+	mutex_lock(&pds_vfio->state_mutex);
+	/*
+	 * only way to transition out of VFIO_DEVICE_STATE_ERROR is via
+	 * VFIO_DEVICE_RESET, so prevent the state machine from running since
+	 * vfio_mig_get_next_state() will throw a WARN_ON() when transitioning
+	 * from VFIO_DEVICE_STATE_ERROR to any other state
+	 */
+	while (pds_vfio->state != VFIO_DEVICE_STATE_ERROR &&
+	       new_state != pds_vfio->state) {
+		enum vfio_device_mig_state next_state;
+
+		int err = vfio_mig_get_next_state(vdev, pds_vfio->state,
+						  new_state, &next_state);
+		if (err) {
+			res = ERR_PTR(err);
+			break;
+		}
+
+		res = pds_vfio_step_device_state_locked(pds_vfio, next_state);
+		if (IS_ERR(res))
+			break;
+
+		pds_vfio->state = next_state;
+
+		if (WARN_ON(res && new_state != pds_vfio->state)) {
+			res = ERR_PTR(-EINVAL);
+			break;
+		}
+	}
+	pds_vfio_state_mutex_unlock(pds_vfio);
+	/* still waiting on a deferred_reset */
+	if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR)
+		res = ERR_PTR(-EIO);
+
+	return res;
+}
+
+static int pds_vfio_get_device_state(struct vfio_device *vdev,
+				     enum vfio_device_mig_state *current_state)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+
+	mutex_lock(&pds_vfio->state_mutex);
+	*current_state = pds_vfio->state;
+	pds_vfio_state_mutex_unlock(pds_vfio);
+	return 0;
+}
+
+static int pds_vfio_get_device_state_size(struct vfio_device *vdev,
+					  unsigned long *stop_copy_length)
+{
+	*stop_copy_length = PDS_LM_DEVICE_STATE_LENGTH;
+	return 0;
+}
+
+static const struct vfio_migration_ops pds_vfio_lm_ops = {
+	.migration_set_state = pds_vfio_set_device_state,
+	.migration_get_state = pds_vfio_get_device_state,
+	.migration_get_data_size = pds_vfio_get_device_state_size
+};
+
+static const struct vfio_log_ops pds_vfio_log_ops = {
+	.log_start = pds_vfio_dma_logging_start,
+	.log_stop = pds_vfio_dma_logging_stop,
+	.log_read_and_clear = pds_vfio_dma_logging_report,
+};
+
+static int pds_vfio_init_device(struct vfio_device *vdev)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+	struct pci_dev *pdev = to_pci_dev(vdev->dev);
+	int err, vf_id, pci_id;
+
+	vf_id = pci_iov_vf_id(pdev);
+	if (vf_id < 0)
+		return vf_id;
+
+	err = vfio_pci_core_init_dev(vdev);
+	if (err)
+		return err;
+
+	pds_vfio->vf_id = vf_id;
+
+	vdev->migration_flags = VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P;
+	vdev->mig_ops = &pds_vfio_lm_ops;
+	vdev->log_ops = &pds_vfio_log_ops;
+
+	pci_id = PCI_DEVID(pdev->bus->number, pdev->devfn);
+	dev_dbg(&pdev->dev,
+		"%s: PF %#04x VF %#04x vf_id %d domain %d pds_vfio %p\n",
+		__func__, pci_dev_id(pdev->physfn), pci_id, vf_id,
+		pci_domain_nr(pdev->bus), pds_vfio);
+
+	return 0;
+}
+
+static int pds_vfio_open_device(struct vfio_device *vdev)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+	int err;
+
+	err = vfio_pci_core_enable(&pds_vfio->vfio_coredev);
+	if (err)
+		return err;
+
+	mutex_init(&pds_vfio->state_mutex);
+	pds_vfio->state = VFIO_DEVICE_STATE_RUNNING;
+	pds_vfio->deferred_reset_state = VFIO_DEVICE_STATE_RUNNING;
+
+	vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);
+
+	return 0;
+}
+
+static void pds_vfio_close_device(struct vfio_device *vdev)
+{
+	struct pds_vfio_pci_device *pds_vfio =
+		container_of(vdev, struct pds_vfio_pci_device,
+			     vfio_coredev.vdev);
+
+	mutex_lock(&pds_vfio->state_mutex);
+	pds_vfio_put_restore_file(pds_vfio);
+	pds_vfio_put_save_file(pds_vfio);
+	pds_vfio_dirty_disable(pds_vfio, true);
+	mutex_unlock(&pds_vfio->state_mutex);
+	mutex_destroy(&pds_vfio->state_mutex);
+	vfio_pci_core_close_device(vdev);
+}
+
+static const struct vfio_device_ops pds_vfio_ops = {
+	.name = "pds-vfio",
+	.init = pds_vfio_init_device,
+	.release = vfio_pci_core_release_dev,
+	.open_device = pds_vfio_open_device,
+	.close_device = pds_vfio_close_device,
+	.ioctl = vfio_pci_core_ioctl,
+	.device_feature = vfio_pci_core_ioctl_feature,
+	.read = vfio_pci_core_read,
+	.write = vfio_pci_core_write,
+	.mmap = vfio_pci_core_mmap,
+	.request = vfio_pci_core_request,
+	.match = vfio_pci_core_match,
+	.bind_iommufd = vfio_iommufd_physical_bind,
+	.unbind_iommufd = vfio_iommufd_physical_unbind,
+	.attach_ioas = vfio_iommufd_physical_attach_ioas,
+};
+
+const struct vfio_device_ops *pds_vfio_ops_info(void)
+{
+	return &pds_vfio_ops;
+}
diff --git a/drivers/vfio/pci/pds/vfio_dev.h b/drivers/vfio/pci/pds/vfio_dev.h
new file mode 100644
index 000000000000..b8f2d667608f
--- /dev/null
+++ b/drivers/vfio/pci/pds/vfio_dev.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
+
+#ifndef _VFIO_DEV_H_
+#define _VFIO_DEV_H_
+
+#include <linux/pci.h>
+#include <linux/vfio_pci_core.h>
+
+#include "dirty.h"
+#include "lm.h"
+
+struct pds_vfio_pci_device {
+	struct vfio_pci_core_device vfio_coredev;
+
+	struct pds_vfio_lm_file *save_file;
+	struct pds_vfio_lm_file *restore_file;
+	struct pds_vfio_dirty dirty;
+	struct mutex state_mutex; /* protect migration state */
+	enum vfio_device_mig_state state;
+	spinlock_t reset_lock; /* protect reset_done flow */
+	u8 deferred_reset;
+	enum vfio_device_mig_state deferred_reset_state;
+	struct notifier_block nb;
+
+	int vf_id;
+	u16 client_id;
+};
+
+void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio);
+
+const struct vfio_device_ops *pds_vfio_ops_info(void);
+struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev);
+void pds_vfio_reset(struct pds_vfio_pci_device *pds_vfio);
+
+struct pci_dev *pds_vfio_to_pci_dev(struct pds_vfio_pci_device *pds_vfio);
+struct device *pds_vfio_to_dev(struct pds_vfio_pci_device *pds_vfio);
+
+#endif /* _VFIO_DEV_H_ */
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 29091ee2e984..cb5b7f865d58 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -141,6 +141,7 @@ static const struct vfio_device_ops vfio_pci_ops = {
 	.bind_iommufd	= vfio_iommufd_physical_bind,
 	.unbind_iommufd	= vfio_iommufd_physical_unbind,
 	.attach_ioas	= vfio_iommufd_physical_attach_ioas,
+	.detach_ioas	= vfio_iommufd_physical_detach_ioas,
 };
 
 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 20d7b69ea6ff..1929103ee59a 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -27,6 +27,7 @@
 #include <linux/vgaarb.h>
 #include <linux/nospec.h>
 #include <linux/sched/mm.h>
+#include <linux/iommufd.h>
 #if IS_ENABLED(CONFIG_EEH)
 #include <asm/eeh.h>
 #endif
@@ -180,7 +181,8 @@ no_mmap:
 struct vfio_pci_group_info;
 static void vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
 static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
-				      struct vfio_pci_group_info *groups);
+				      struct vfio_pci_group_info *groups,
+				      struct iommufd_ctx *iommufd_ctx);
 
 /*
  * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
@@ -776,29 +778,65 @@ static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
 }
 
 struct vfio_pci_fill_info {
-	int max;
-	int cur;
-	struct vfio_pci_dependent_device *devices;
+	struct vfio_pci_dependent_device __user *devices;
+	struct vfio_pci_dependent_device __user *devices_end;
+	struct vfio_device *vdev;
+	u32 count;
+	u32 flags;
 };
 
 static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
 {
+	struct vfio_pci_dependent_device info = {
+		.segment = pci_domain_nr(pdev->bus),
+		.bus = pdev->bus->number,
+		.devfn = pdev->devfn,
+	};
 	struct vfio_pci_fill_info *fill = data;
-	struct iommu_group *iommu_group;
 
-	if (fill->cur == fill->max)
-		return -EAGAIN; /* Something changed, try again */
+	fill->count++;
+	if (fill->devices >= fill->devices_end)
+		return 0;
+
+	if (fill->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID) {
+		struct iommufd_ctx *iommufd = vfio_iommufd_device_ictx(fill->vdev);
+		struct vfio_device_set *dev_set = fill->vdev->dev_set;
+		struct vfio_device *vdev;
+
+		/*
+		 * hot-reset requires all affected devices be represented in
+		 * the dev_set.
+		 */
+		vdev = vfio_find_device_in_devset(dev_set, &pdev->dev);
+		if (!vdev) {
+			info.devid = VFIO_PCI_DEVID_NOT_OWNED;
+		} else {
+			int id = vfio_iommufd_get_dev_id(vdev, iommufd);
+
+			if (id > 0)
+				info.devid = id;
+			else if (id == -ENOENT)
+				info.devid = VFIO_PCI_DEVID_OWNED;
+			else
+				info.devid = VFIO_PCI_DEVID_NOT_OWNED;
+		}
+		/* If devid is VFIO_PCI_DEVID_NOT_OWNED, clear owned flag. */
+		if (info.devid == VFIO_PCI_DEVID_NOT_OWNED)
+			fill->flags &= ~VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED;
+	} else {
+		struct iommu_group *iommu_group;
+
+		iommu_group = iommu_group_get(&pdev->dev);
+		if (!iommu_group)
+			return -EPERM; /* Cannot reset non-isolated devices */
 
-	iommu_group = iommu_group_get(&pdev->dev);
-	if (!iommu_group)
-		return -EPERM; /* Cannot reset non-isolated devices */
+		info.group_id = iommu_group_id(iommu_group);
+		iommu_group_put(iommu_group);
+	}
 
-	fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
-	fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
-	fill->devices[fill->cur].bus = pdev->bus->number;
-	fill->devices[fill->cur].devfn = pdev->devfn;
-	fill->cur++;
-	iommu_group_put(iommu_group);
+	if (copy_to_user(fill->devices, &info, sizeof(info)))
+		return -EFAULT;
+	fill->devices++;
 	return 0;
 }
 
@@ -920,24 +958,17 @@ static int vfio_pci_ioctl_get_info(struct vfio_pci_core_device *vdev,
 				   struct vfio_device_info __user *arg)
 {
 	unsigned long minsz = offsetofend(struct vfio_device_info, num_irqs);
-	struct vfio_device_info info;
+	struct vfio_device_info info = {};
 	struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-	unsigned long capsz;
 	int ret;
 
-	/* For backward compatibility, cannot require this */
-	capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
-
 	if (copy_from_user(&info, arg, minsz))
 		return -EFAULT;
 
 	if (info.argsz < minsz)
 		return -EINVAL;
 
-	if (info.argsz >= capsz) {
-		minsz = capsz;
-		info.cap_offset = 0;
-	}
+	minsz = min_t(size_t, info.argsz, sizeof(info));
 
 	info.flags = VFIO_DEVICE_FLAGS_PCI;
 
@@ -1228,8 +1259,7 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
 	unsigned long minsz =
 		offsetofend(struct vfio_pci_hot_reset_info, count);
 	struct vfio_pci_hot_reset_info hdr;
-	struct vfio_pci_fill_info fill = { 0 };
-	struct vfio_pci_dependent_device *devices = NULL;
+	struct vfio_pci_fill_info fill = {};
 	bool slot = false;
 	int ret = 0;
 
@@ -1247,78 +1277,42 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
 	else if (pci_probe_reset_bus(vdev->pdev->bus))
 		return -ENODEV;
 
-	/* How many devices are affected? */
-	ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_count_devs,
-					    &fill.max, slot);
-	if (ret)
-		return ret;
+	fill.devices = arg->devices;
+	fill.devices_end = arg->devices +
+			   (hdr.argsz - sizeof(hdr)) / sizeof(arg->devices[0]);
+	fill.vdev = &vdev->vdev;
 
-	WARN_ON(!fill.max); /* Should always be at least one */
-
-	/*
-	 * If there's enough space, fill it now, otherwise return -ENOSPC and
-	 * the number of devices affected.
-	 */
-	if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
-		ret = -ENOSPC;
-		hdr.count = fill.max;
-		goto reset_info_exit;
-	}
-
-	devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
-	if (!devices)
-		return -ENOMEM;
-
-	fill.devices = devices;
+	if (vfio_device_cdev_opened(&vdev->vdev))
+		fill.flags |= VFIO_PCI_HOT_RESET_FLAG_DEV_ID |
+			     VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED;
 
+	mutex_lock(&vdev->vdev.dev_set->lock);
 	ret = vfio_pci_for_each_slot_or_bus(vdev->pdev, vfio_pci_fill_devs,
 					    &fill, slot);
+	mutex_unlock(&vdev->vdev.dev_set->lock);
+	if (ret)
+		return ret;
 
-	/*
-	 * If a device was removed between counting and filling, we may come up
-	 * short of fill.max.  If a device was added, we'll have a return of
-	 * -EAGAIN above.
-	 */
-	if (!ret)
-		hdr.count = fill.cur;
-
-reset_info_exit:
+	hdr.count = fill.count;
+	hdr.flags = fill.flags;
 	if (copy_to_user(arg, &hdr, minsz))
-		ret = -EFAULT;
-
-	if (!ret) {
-		if (copy_to_user(&arg->devices, devices,
-				 hdr.count * sizeof(*devices)))
-			ret = -EFAULT;
-	}
+		return -EFAULT;
 
-	kfree(devices);
-	return ret;
+	if (fill.count > fill.devices - arg->devices)
+		return -ENOSPC;
+	return 0;
 }
 
-static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
-					struct vfio_pci_hot_reset __user *arg)
+static int
+vfio_pci_ioctl_pci_hot_reset_groups(struct vfio_pci_core_device *vdev,
+				    int array_count, bool slot,
+				    struct vfio_pci_hot_reset __user *arg)
 {
-	unsigned long minsz = offsetofend(struct vfio_pci_hot_reset, count);
-	struct vfio_pci_hot_reset hdr;
 	int32_t *group_fds;
 	struct file **files;
 	struct vfio_pci_group_info info;
-	bool slot = false;
 	int file_idx, count = 0, ret = 0;
 
-	if (copy_from_user(&hdr, arg, minsz))
-		return -EFAULT;
-
-	if (hdr.argsz < minsz || hdr.flags)
-		return -EINVAL;
-
-	/* Can we do a slot or bus reset or neither? */
-	if (!pci_probe_reset_slot(vdev->pdev->slot))
-		slot = true;
-	else if (pci_probe_reset_bus(vdev->pdev->bus))
-		return -ENODEV;
-
 	/*
 	 * We can't let userspace give us an arbitrarily large buffer to copy,
 	 * so verify how many we think there could be.  Note groups can have
@@ -1329,12 +1323,11 @@ static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
 	if (ret)
 		return ret;
 
-	/* Somewhere between 1 and count is OK */
-	if (!hdr.count || hdr.count > count)
+	if (array_count > count)
 		return -EINVAL;
 
-	group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
-	files = kcalloc(hdr.count, sizeof(*files), GFP_KERNEL);
+	group_fds = kcalloc(array_count, sizeof(*group_fds), GFP_KERNEL);
+	files = kcalloc(array_count, sizeof(*files), GFP_KERNEL);
 	if (!group_fds || !files) {
 		kfree(group_fds);
 		kfree(files);
@@ -1342,18 +1335,17 @@ static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
 	}
 
 	if (copy_from_user(group_fds, arg->group_fds,
-			   hdr.count * sizeof(*group_fds))) {
+			   array_count * sizeof(*group_fds))) {
 		kfree(group_fds);
 		kfree(files);
 		return -EFAULT;
 	}
 
 	/*
-	 * For each group_fd, get the group through the vfio external user
-	 * interface and store the group and iommu ID.  This ensures the group
-	 * is held across the reset.
+	 * Get the group file for each fd to ensure the group is held across
+	 * the reset
 	 */
-	for (file_idx = 0; file_idx < hdr.count; file_idx++) {
+	for (file_idx = 0; file_idx < array_count; file_idx++) {
 		struct file *file = fget(group_fds[file_idx]);
 
 		if (!file) {
@@ -1377,10 +1369,10 @@ static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
 	if (ret)
 		goto hot_reset_release;
 
-	info.count = hdr.count;
+	info.count = array_count;
 	info.files = files;
 
-	ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
+	ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info, NULL);
 
 hot_reset_release:
 	for (file_idx--; file_idx >= 0; file_idx--)
@@ -1390,6 +1382,36 @@ hot_reset_release:
 	return ret;
 }
 
+static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
+					struct vfio_pci_hot_reset __user *arg)
+{
+	unsigned long minsz = offsetofend(struct vfio_pci_hot_reset, count);
+	struct vfio_pci_hot_reset hdr;
+	bool slot = false;
+
+	if (copy_from_user(&hdr, arg, minsz))
+		return -EFAULT;
+
+	if (hdr.argsz < minsz || hdr.flags)
+		return -EINVAL;
+
+	/* zero-length array is only for cdev opened devices */
+	if (!!hdr.count == vfio_device_cdev_opened(&vdev->vdev))
+		return -EINVAL;
+
+	/* Can we do a slot or bus reset or neither? */
+	if (!pci_probe_reset_slot(vdev->pdev->slot))
+		slot = true;
+	else if (pci_probe_reset_bus(vdev->pdev->bus))
+		return -ENODEV;
+
+	if (hdr.count)
+		return vfio_pci_ioctl_pci_hot_reset_groups(vdev, hdr.count, slot, arg);
+
+	return vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, NULL,
+					  vfio_iommufd_device_ictx(&vdev->vdev));
+}
+
 static int vfio_pci_ioctl_ioeventfd(struct vfio_pci_core_device *vdev,
 				    struct vfio_device_ioeventfd __user *arg)
 {
@@ -2355,13 +2377,16 @@ const struct pci_error_handlers vfio_pci_core_err_handlers = {
 };
 EXPORT_SYMBOL_GPL(vfio_pci_core_err_handlers);
 
-static bool vfio_dev_in_groups(struct vfio_pci_core_device *vdev,
+static bool vfio_dev_in_groups(struct vfio_device *vdev,
 			       struct vfio_pci_group_info *groups)
 {
 	unsigned int i;
 
+	if (!groups)
+		return false;
+
 	for (i = 0; i < groups->count; i++)
-		if (vfio_file_has_dev(groups->files[i], &vdev->vdev))
+		if (vfio_file_has_dev(groups->files[i], vdev))
 			return true;
 	return false;
 }
@@ -2369,12 +2394,8 @@ static bool vfio_dev_in_groups(struct vfio_pci_core_device *vdev,
 static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
 {
 	struct vfio_device_set *dev_set = data;
-	struct vfio_device *cur;
 
-	list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
-		if (cur->dev == &pdev->dev)
-			return 0;
-	return -EBUSY;
+	return vfio_find_device_in_devset(dev_set, &pdev->dev) ? 0 : -ENODEV;
 }
 
 /*
@@ -2441,7 +2462,8 @@ unwind:
  * get each memory_lock.
  */
 static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
-				      struct vfio_pci_group_info *groups)
+				      struct vfio_pci_group_info *groups,
+				      struct iommufd_ctx *iommufd_ctx)
 {
 	struct vfio_pci_core_device *cur_mem;
 	struct vfio_pci_core_device *cur_vma;
@@ -2471,11 +2493,38 @@ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
 		goto err_unlock;
 
 	list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
+		bool owned;
+
 		/*
-		 * Test whether all the affected devices are contained by the
-		 * set of groups provided by the user.
+		 * Test whether all the affected devices can be reset by the
+		 * user.
+		 *
+		 * If called from a group opened device and the user provides
+		 * a set of groups, all the devices in the dev_set should be
+		 * contained by the set of groups provided by the user.
+		 *
+		 * If called from a cdev opened device and the user provides
+		 * a zero-length array, all the devices in the dev_set must
+		 * be bound to the same iommufd_ctx as the input iommufd_ctx.
+		 * If there is any device that has not been bound to any
+		 * iommufd_ctx yet, check if its iommu_group has any device
+		 * bound to the input iommufd_ctx.  Such devices can be
+		 * considered owned by the input iommufd_ctx as the device
+		 * cannot be owned by another iommufd_ctx when its iommu_group
+		 * is owned.
+		 *
+		 * Otherwise, reset is not allowed.
 		 */
-		if (!vfio_dev_in_groups(cur_vma, groups)) {
+		if (iommufd_ctx) {
+			int devid = vfio_iommufd_get_dev_id(&cur_vma->vdev,
+							    iommufd_ctx);
+
+			owned = (devid > 0 || devid == -ENOENT);
+		} else {
+			owned = vfio_dev_in_groups(&cur_vma->vdev, groups);
+		}
+
+		if (!owned) {
 			ret = -EINVAL;
 			goto err_undo;
 		}
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index 83fe54015595..6464b3939ebc 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -119,6 +119,7 @@ static const struct vfio_device_ops vfio_amba_ops = {
 	.bind_iommufd	= vfio_iommufd_physical_bind,
 	.unbind_iommufd	= vfio_iommufd_physical_unbind,
 	.attach_ioas	= vfio_iommufd_physical_attach_ioas,
+	.detach_ioas	= vfio_iommufd_physical_detach_ioas,
 };
 
 static const struct amba_id pl330_ids[] = {
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 22a1efca32a8..8cf22fa65baa 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -108,6 +108,7 @@ static const struct vfio_device_ops vfio_platform_ops = {
 	.bind_iommufd	= vfio_iommufd_physical_bind,
 	.unbind_iommufd	= vfio_iommufd_physical_unbind,
 	.attach_ioas	= vfio_iommufd_physical_attach_ioas,
+	.detach_ioas	= vfio_iommufd_physical_detach_ioas,
 };
 
 static struct platform_driver vfio_platform_driver = {
diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
index 7b19c621e0e6..307e3f29b527 100644
--- a/drivers/vfio/vfio.h
+++ b/drivers/vfio/vfio.h
@@ -16,14 +16,32 @@ struct iommufd_ctx;
 struct iommu_group;
 struct vfio_container;
 
+struct vfio_device_file {
+	struct vfio_device *device;
+	struct vfio_group *group;
+
+	u8 access_granted;
+	u32 devid; /* only valid when iommufd is valid */
+	spinlock_t kvm_ref_lock; /* protect kvm field */
+	struct kvm *kvm;
+	struct iommufd_ctx *iommufd; /* protected by struct vfio_device_set::lock */
+};
+
 void vfio_device_put_registration(struct vfio_device *device);
 bool vfio_device_try_get_registration(struct vfio_device *device);
-int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd);
-void vfio_device_close(struct vfio_device *device,
-		       struct iommufd_ctx *iommufd);
+int vfio_df_open(struct vfio_device_file *df);
+void vfio_df_close(struct vfio_device_file *df);
+struct vfio_device_file *
+vfio_allocate_device_file(struct vfio_device *device);
 
 extern const struct file_operations vfio_device_fops;
 
+#ifdef CONFIG_VFIO_NOIOMMU
+extern bool vfio_noiommu __read_mostly;
+#else
+enum { vfio_noiommu = false };
+#endif
+
 enum vfio_group_type {
 	/*
 	 * Physical device with IOMMU backing.
@@ -48,6 +66,7 @@ enum vfio_group_type {
 	VFIO_NO_IOMMU,
 };
 
+#if IS_ENABLED(CONFIG_VFIO_GROUP)
 struct vfio_group {
 	struct device 			dev;
 	struct cdev			cdev;
@@ -74,8 +93,11 @@ struct vfio_group {
 	struct blocking_notifier_head	notifier;
 	struct iommufd_ctx		*iommufd;
 	spinlock_t			kvm_ref_lock;
+	unsigned int			cdev_device_open_cnt;
 };
 
+int vfio_device_block_group(struct vfio_device *device);
+void vfio_device_unblock_group(struct vfio_device *device);
 int vfio_device_set_group(struct vfio_device *device,
 			  enum vfio_group_type type);
 void vfio_device_remove_group(struct vfio_device *device);
@@ -83,7 +105,10 @@ void vfio_device_group_register(struct vfio_device *device);
 void vfio_device_group_unregister(struct vfio_device *device);
 int vfio_device_group_use_iommu(struct vfio_device *device);
 void vfio_device_group_unuse_iommu(struct vfio_device *device);
-void vfio_device_group_close(struct vfio_device *device);
+void vfio_df_group_close(struct vfio_device_file *df);
+struct vfio_group *vfio_group_from_file(struct file *file);
+bool vfio_group_enforced_coherent(struct vfio_group *group);
+void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
 bool vfio_device_has_container(struct vfio_device *device);
 int __init vfio_group_init(void);
 void vfio_group_cleanup(void);
@@ -93,6 +118,82 @@ static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
 	return IS_ENABLED(CONFIG_VFIO_NOIOMMU) &&
 	       vdev->group->type == VFIO_NO_IOMMU;
 }
+#else
+struct vfio_group;
+
+static inline int vfio_device_block_group(struct vfio_device *device)
+{
+	return 0;
+}
+
+static inline void vfio_device_unblock_group(struct vfio_device *device)
+{
+}
+
+static inline int vfio_device_set_group(struct vfio_device *device,
+					enum vfio_group_type type)
+{
+	return 0;
+}
+
+static inline void vfio_device_remove_group(struct vfio_device *device)
+{
+}
+
+static inline void vfio_device_group_register(struct vfio_device *device)
+{
+}
+
+static inline void vfio_device_group_unregister(struct vfio_device *device)
+{
+}
+
+static inline int vfio_device_group_use_iommu(struct vfio_device *device)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void vfio_device_group_unuse_iommu(struct vfio_device *device)
+{
+}
+
+static inline void vfio_df_group_close(struct vfio_device_file *df)
+{
+}
+
+static inline struct vfio_group *vfio_group_from_file(struct file *file)
+{
+	return NULL;
+}
+
+static inline bool vfio_group_enforced_coherent(struct vfio_group *group)
+{
+	return true;
+}
+
+static inline void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
+{
+}
+
+static inline bool vfio_device_has_container(struct vfio_device *device)
+{
+	return false;
+}
+
+static inline int __init vfio_group_init(void)
+{
+	return 0;
+}
+
+static inline void vfio_group_cleanup(void)
+{
+}
+
+static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
+{
+	return false;
+}
+#endif /* CONFIG_VFIO_GROUP */
 
 #if IS_ENABLED(CONFIG_VFIO_CONTAINER)
 /**
@@ -217,20 +318,109 @@ static inline void vfio_container_cleanup(void)
 #endif
 
 #if IS_ENABLED(CONFIG_IOMMUFD)
-int vfio_iommufd_bind(struct vfio_device *device, struct iommufd_ctx *ictx);
-void vfio_iommufd_unbind(struct vfio_device *device);
+bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
+					 struct iommufd_ctx *ictx);
+int vfio_df_iommufd_bind(struct vfio_device_file *df);
+void vfio_df_iommufd_unbind(struct vfio_device_file *df);
+int vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
+				    struct iommufd_ctx *ictx);
 #else
-static inline int vfio_iommufd_bind(struct vfio_device *device,
+static inline bool
+vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
 				    struct iommufd_ctx *ictx)
 {
+	return false;
+}
+
+static inline int vfio_df_iommufd_bind(struct vfio_device_file *fd)
+{
 	return -EOPNOTSUPP;
 }
 
-static inline void vfio_iommufd_unbind(struct vfio_device *device)
+static inline void vfio_df_iommufd_unbind(struct vfio_device_file *df)
 {
 }
+
+static inline int
+vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
+				struct iommufd_ctx *ictx)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
+int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
+			    struct vfio_device_attach_iommufd_pt __user *arg);
+int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
+			    struct vfio_device_detach_iommufd_pt __user *arg);
+
+#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
+void vfio_init_device_cdev(struct vfio_device *device);
+
+static inline int vfio_device_add(struct vfio_device *device)
+{
+	/* cdev does not support noiommu device */
+	if (vfio_device_is_noiommu(device))
+		return device_add(&device->device);
+	vfio_init_device_cdev(device);
+	return cdev_device_add(&device->cdev, &device->device);
+}
+
+static inline void vfio_device_del(struct vfio_device *device)
+{
+	if (vfio_device_is_noiommu(device))
+		device_del(&device->device);
+	else
+		cdev_device_del(&device->cdev, &device->device);
+}
+
+int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep);
+long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
+				struct vfio_device_bind_iommufd __user *arg);
+void vfio_df_unbind_iommufd(struct vfio_device_file *df);
+int vfio_cdev_init(struct class *device_class);
+void vfio_cdev_cleanup(void);
+#else
+static inline void vfio_init_device_cdev(struct vfio_device *device)
+{
+}
+
+static inline int vfio_device_add(struct vfio_device *device)
+{
+	return device_add(&device->device);
+}
+
+static inline void vfio_device_del(struct vfio_device *device)
+{
+	device_del(&device->device);
+}
+
+static inline int vfio_device_fops_cdev_open(struct inode *inode,
+					     struct file *filep)
+{
+	return 0;
+}
+
+static inline long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
+					      struct vfio_device_bind_iommufd __user *arg)
+{
+	return -ENOTTY;
+}
+
+static inline void vfio_df_unbind_iommufd(struct vfio_device_file *df)
+{
+}
+
+static inline int vfio_cdev_init(struct class *device_class)
+{
+	return 0;
+}
+
+static inline void vfio_cdev_cleanup(void)
+{
+}
+#endif /* CONFIG_VFIO_DEVICE_CDEV */
+
 #if IS_ENABLED(CONFIG_VFIO_VIRQFD)
 int __init vfio_virqfd_init(void);
 void vfio_virqfd_exit(void);
@@ -244,18 +434,12 @@ static inline void vfio_virqfd_exit(void)
 }
 #endif
 
-#ifdef CONFIG_VFIO_NOIOMMU
-extern bool vfio_noiommu __read_mostly;
-#else
-enum { vfio_noiommu = false };
-#endif
-
 #ifdef CONFIG_HAVE_KVM
-void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
+void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
 void vfio_device_put_kvm(struct vfio_device *device);
 #else
-static inline void _vfio_device_get_kvm_safe(struct vfio_device *device,
-					     struct kvm *kvm)
+static inline void vfio_device_get_kvm_safe(struct vfio_device *device,
+					    struct kvm *kvm)
 {
 }
 
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index ebe0ad31d0b0..eacd6ec04de5 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2732,7 +2732,7 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu *iommu,
 static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
 					   struct vfio_info_cap *caps)
 {
-	struct vfio_iommu_type1_info_cap_migration cap_mig;
+	struct vfio_iommu_type1_info_cap_migration cap_mig = {};
 
 	cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;
 	cap_mig.header.version = 1;
@@ -2762,27 +2762,20 @@ static int vfio_iommu_dma_avail_build_caps(struct vfio_iommu *iommu,
 static int vfio_iommu_type1_get_info(struct vfio_iommu *iommu,
 				     unsigned long arg)
 {
-	struct vfio_iommu_type1_info info;
+	struct vfio_iommu_type1_info info = {};
 	unsigned long minsz;
 	struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-	unsigned long capsz;
 	int ret;
 
 	minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
 
-	/* For backward compatibility, cannot require this */
-	capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
-
 	if (copy_from_user(&info, (void __user *)arg, minsz))
 		return -EFAULT;
 
 	if (info.argsz < minsz)
 		return -EINVAL;
 
-	if (info.argsz >= capsz) {
-		minsz = capsz;
-		info.cap_offset = 0; /* output, no-recopy necessary */
-	}
+	minsz = min_t(size_t, info.argsz, sizeof(info));
 
 	mutex_lock(&iommu->lock);
 	info.flags = VFIO_IOMMU_INFO_PGSIZES;
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index f0ca33b2e1df..cfad824d9aa2 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -141,6 +141,21 @@ unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set)
 }
 EXPORT_SYMBOL_GPL(vfio_device_set_open_count);
 
+struct vfio_device *
+vfio_find_device_in_devset(struct vfio_device_set *dev_set,
+			   struct device *dev)
+{
+	struct vfio_device *cur;
+
+	lockdep_assert_held(&dev_set->lock);
+
+	list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
+		if (cur->dev == dev)
+			return cur;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_find_device_in_devset);
+
 /*
  * Device objects - create, release, get, put, search
  */
@@ -258,7 +273,8 @@ static int __vfio_register_dev(struct vfio_device *device,
 	if (WARN_ON(IS_ENABLED(CONFIG_IOMMUFD) &&
 		    (!device->ops->bind_iommufd ||
 		     !device->ops->unbind_iommufd ||
-		     !device->ops->attach_ioas)))
+		     !device->ops->attach_ioas ||
+		     !device->ops->detach_ioas)))
 		return -EINVAL;
 
 	/*
@@ -276,7 +292,18 @@ static int __vfio_register_dev(struct vfio_device *device,
 	if (ret)
 		return ret;
 
-	ret = device_add(&device->device);
+	/*
+	 * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
+	 * restore cache coherency. It has to be checked here because it is only
+	 * valid for cases where we are using iommu groups.
+	 */
+	if (type == VFIO_IOMMU && !vfio_device_is_noiommu(device) &&
+	    !device_iommu_capable(device->dev, IOMMU_CAP_CACHE_COHERENCY)) {
+		ret = -EINVAL;
+		goto err_out;
+	}
+
+	ret = vfio_device_add(device);
 	if (ret)
 		goto err_out;
 
@@ -316,6 +343,18 @@ void vfio_unregister_group_dev(struct vfio_device *device)
 	bool interrupted = false;
 	long rc;
 
+	/*
+	 * Prevent new device opened by userspace via the
+	 * VFIO_GROUP_GET_DEVICE_FD in the group path.
+	 */
+	vfio_device_group_unregister(device);
+
+	/*
+	 * Balances vfio_device_add() in register path, also prevents
+	 * new device opened by userspace in the cdev path.
+	 */
+	vfio_device_del(device);
+
 	vfio_device_put_registration(device);
 	rc = try_wait_for_completion(&device->comp);
 	while (rc <= 0) {
@@ -339,18 +378,13 @@ void vfio_unregister_group_dev(struct vfio_device *device)
 		}
 	}
 
-	vfio_device_group_unregister(device);
-
-	/* Balances device_add in register path */
-	device_del(&device->device);
-
 	/* Balances vfio_device_set_group in register path */
 	vfio_device_remove_group(device);
 }
 EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
 
 #ifdef CONFIG_HAVE_KVM
-void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm)
+void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm)
 {
 	void (*pfn)(struct kvm *kvm);
 	bool (*fn)(struct kvm *kvm);
@@ -358,6 +392,9 @@ void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm)
 
 	lockdep_assert_held(&device->dev_set->lock);
 
+	if (!kvm)
+		return;
+
 	pfn = symbol_get(kvm_put_kvm);
 	if (WARN_ON(!pfn))
 		return;
@@ -404,9 +441,25 @@ static bool vfio_assert_device_open(struct vfio_device *device)
 	return !WARN_ON_ONCE(!READ_ONCE(device->open_count));
 }
 
-static int vfio_device_first_open(struct vfio_device *device,
-				  struct iommufd_ctx *iommufd)
+struct vfio_device_file *
+vfio_allocate_device_file(struct vfio_device *device)
 {
+	struct vfio_device_file *df;
+
+	df = kzalloc(sizeof(*df), GFP_KERNEL_ACCOUNT);
+	if (!df)
+		return ERR_PTR(-ENOMEM);
+
+	df->device = device;
+	spin_lock_init(&df->kvm_ref_lock);
+
+	return df;
+}
+
+static int vfio_df_device_first_open(struct vfio_device_file *df)
+{
+	struct vfio_device *device = df->device;
+	struct iommufd_ctx *iommufd = df->iommufd;
 	int ret;
 
 	lockdep_assert_held(&device->dev_set->lock);
@@ -415,7 +468,7 @@ static int vfio_device_first_open(struct vfio_device *device,
 		return -ENODEV;
 
 	if (iommufd)
-		ret = vfio_iommufd_bind(device, iommufd);
+		ret = vfio_df_iommufd_bind(df);
 	else
 		ret = vfio_device_group_use_iommu(device);
 	if (ret)
@@ -430,7 +483,7 @@ static int vfio_device_first_open(struct vfio_device *device,
 
 err_unuse_iommu:
 	if (iommufd)
-		vfio_iommufd_unbind(device);
+		vfio_df_iommufd_unbind(df);
 	else
 		vfio_device_group_unuse_iommu(device);
 err_module_put:
@@ -438,29 +491,39 @@ err_module_put:
 	return ret;
 }
 
-static void vfio_device_last_close(struct vfio_device *device,
-				   struct iommufd_ctx *iommufd)
+static void vfio_df_device_last_close(struct vfio_device_file *df)
 {
+	struct vfio_device *device = df->device;
+	struct iommufd_ctx *iommufd = df->iommufd;
+
 	lockdep_assert_held(&device->dev_set->lock);
 
 	if (device->ops->close_device)
 		device->ops->close_device(device);
 	if (iommufd)
-		vfio_iommufd_unbind(device);
+		vfio_df_iommufd_unbind(df);
 	else
 		vfio_device_group_unuse_iommu(device);
 	module_put(device->dev->driver->owner);
 }
 
-int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd)
+int vfio_df_open(struct vfio_device_file *df)
 {
+	struct vfio_device *device = df->device;
 	int ret = 0;
 
 	lockdep_assert_held(&device->dev_set->lock);
 
+	/*
+	 * Only the group path allows the device to be opened multiple
+	 * times.  The device cdev path doesn't have a secure way for it.
+	 */
+	if (device->open_count != 0 && !df->group)
+		return -EINVAL;
+
 	device->open_count++;
 	if (device->open_count == 1) {
-		ret = vfio_device_first_open(device, iommufd);
+		ret = vfio_df_device_first_open(df);
 		if (ret)
 			device->open_count--;
 	}
@@ -468,14 +531,15 @@ int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd)
 	return ret;
 }
 
-void vfio_device_close(struct vfio_device *device,
-		       struct iommufd_ctx *iommufd)
+void vfio_df_close(struct vfio_device_file *df)
 {
+	struct vfio_device *device = df->device;
+
 	lockdep_assert_held(&device->dev_set->lock);
 
 	vfio_assert_device_open(device);
 	if (device->open_count == 1)
-		vfio_device_last_close(device, iommufd);
+		vfio_df_device_last_close(df);
 	device->open_count--;
 }
 
@@ -517,12 +581,18 @@ static inline void vfio_device_pm_runtime_put(struct vfio_device *device)
  */
 static int vfio_device_fops_release(struct inode *inode, struct file *filep)
 {
-	struct vfio_device *device = filep->private_data;
+	struct vfio_device_file *df = filep->private_data;
+	struct vfio_device *device = df->device;
 
-	vfio_device_group_close(device);
+	if (df->group)
+		vfio_df_group_close(df);
+	else
+		vfio_df_unbind_iommufd(df);
 
 	vfio_device_put_registration(device);
 
+	kfree(df);
+
 	return 0;
 }
 
@@ -865,6 +935,53 @@ static int vfio_ioctl_device_feature_migration(struct vfio_device *device,
 	return 0;
 }
 
+void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
+			      u32 req_nodes)
+{
+	struct interval_tree_node *prev, *curr, *comb_start, *comb_end;
+	unsigned long min_gap, curr_gap;
+
+	/* Special shortcut when a single range is required */
+	if (req_nodes == 1) {
+		unsigned long last;
+
+		comb_start = interval_tree_iter_first(root, 0, ULONG_MAX);
+		curr = comb_start;
+		while (curr) {
+			last = curr->last;
+			prev = curr;
+			curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
+			if (prev != comb_start)
+				interval_tree_remove(prev, root);
+		}
+		comb_start->last = last;
+		return;
+	}
+
+	/* Combine ranges which have the smallest gap */
+	while (cur_nodes > req_nodes) {
+		prev = NULL;
+		min_gap = ULONG_MAX;
+		curr = interval_tree_iter_first(root, 0, ULONG_MAX);
+		while (curr) {
+			if (prev) {
+				curr_gap = curr->start - prev->last;
+				if (curr_gap < min_gap) {
+					min_gap = curr_gap;
+					comb_start = prev;
+					comb_end = curr;
+				}
+			}
+			prev = curr;
+			curr = interval_tree_iter_next(curr, 0, ULONG_MAX);
+		}
+		comb_start->last = comb_end->last;
+		interval_tree_remove(comb_end, root);
+		cur_nodes--;
+	}
+}
+EXPORT_SYMBOL_GPL(vfio_combine_iova_ranges);
+
 /* Ranges should fit into a single kernel page */
 #define LOG_MAX_RANGES \
 	(PAGE_SIZE / sizeof(struct vfio_device_feature_dma_logging_range))
@@ -1087,16 +1204,38 @@ static int vfio_ioctl_device_feature(struct vfio_device *device,
 static long vfio_device_fops_unl_ioctl(struct file *filep,
 				       unsigned int cmd, unsigned long arg)
 {
-	struct vfio_device *device = filep->private_data;
+	struct vfio_device_file *df = filep->private_data;
+	struct vfio_device *device = df->device;
+	void __user *uptr = (void __user *)arg;
 	int ret;
 
+	if (cmd == VFIO_DEVICE_BIND_IOMMUFD)
+		return vfio_df_ioctl_bind_iommufd(df, uptr);
+
+	/* Paired with smp_store_release() following vfio_df_open() */
+	if (!smp_load_acquire(&df->access_granted))
+		return -EINVAL;
+
 	ret = vfio_device_pm_runtime_get(device);
 	if (ret)
 		return ret;
 
+	/* cdev only ioctls */
+	if (IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV) && !df->group) {
+		switch (cmd) {
+		case VFIO_DEVICE_ATTACH_IOMMUFD_PT:
+			ret = vfio_df_ioctl_attach_pt(df, uptr);
+			goto out;
+
+		case VFIO_DEVICE_DETACH_IOMMUFD_PT:
+			ret = vfio_df_ioctl_detach_pt(df, uptr);
+			goto out;
+		}
+	}
+
 	switch (cmd) {
 	case VFIO_DEVICE_FEATURE:
-		ret = vfio_ioctl_device_feature(device, (void __user *)arg);
+		ret = vfio_ioctl_device_feature(device, uptr);
 		break;
 
 	default:
@@ -1106,7 +1245,7 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
 			ret = device->ops->ioctl(device, cmd, arg);
 		break;
 	}
-
+out:
 	vfio_device_pm_runtime_put(device);
 	return ret;
 }
@@ -1114,7 +1253,12 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
 static ssize_t vfio_device_fops_read(struct file *filep, char __user *buf,
 				     size_t count, loff_t *ppos)
 {
-	struct vfio_device *device = filep->private_data;
+	struct vfio_device_file *df = filep->private_data;
+	struct vfio_device *device = df->device;
+
+	/* Paired with smp_store_release() following vfio_df_open() */
+	if (!smp_load_acquire(&df->access_granted))
+		return -EINVAL;
 
 	if (unlikely(!device->ops->read))
 		return -EINVAL;
@@ -1126,7 +1270,12 @@ static ssize_t vfio_device_fops_write(struct file *filep,
 				      const char __user *buf,
 				      size_t count, loff_t *ppos)
 {
-	struct vfio_device *device = filep->private_data;
+	struct vfio_device_file *df = filep->private_data;
+	struct vfio_device *device = df->device;
+
+	/* Paired with smp_store_release() following vfio_df_open() */
+	if (!smp_load_acquire(&df->access_granted))
+		return -EINVAL;
 
 	if (unlikely(!device->ops->write))
 		return -EINVAL;
@@ -1136,7 +1285,12 @@ static ssize_t vfio_device_fops_write(struct file *filep,
 
 static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma)
 {
-	struct vfio_device *device = filep->private_data;
+	struct vfio_device_file *df = filep->private_data;
+	struct vfio_device *device = df->device;
+
+	/* Paired with smp_store_release() following vfio_df_open() */
+	if (!smp_load_acquire(&df->access_granted))
+		return -EINVAL;
 
 	if (unlikely(!device->ops->mmap))
 		return -EINVAL;
@@ -1146,6 +1300,7 @@ static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma)
 
 const struct file_operations vfio_device_fops = {
 	.owner		= THIS_MODULE,
+	.open		= vfio_device_fops_cdev_open,
 	.release	= vfio_device_fops_release,
 	.read		= vfio_device_fops_read,
 	.write		= vfio_device_fops_write,
@@ -1154,6 +1309,88 @@ const struct file_operations vfio_device_fops = {
 	.mmap		= vfio_device_fops_mmap,
 };
 
+static struct vfio_device *vfio_device_from_file(struct file *file)
+{
+	struct vfio_device_file *df = file->private_data;
+
+	if (file->f_op != &vfio_device_fops)
+		return NULL;
+	return df->device;
+}
+
+/**
+ * vfio_file_is_valid - True if the file is valid vfio file
+ * @file: VFIO group file or VFIO device file
+ */
+bool vfio_file_is_valid(struct file *file)
+{
+	return vfio_group_from_file(file) ||
+	       vfio_device_from_file(file);
+}
+EXPORT_SYMBOL_GPL(vfio_file_is_valid);
+
+/**
+ * vfio_file_enforced_coherent - True if the DMA associated with the VFIO file
+ *        is always CPU cache coherent
+ * @file: VFIO group file or VFIO device file
+ *
+ * Enforced coherency means that the IOMMU ignores things like the PCIe no-snoop
+ * bit in DMA transactions. A return of false indicates that the user has
+ * rights to access additional instructions such as wbinvd on x86.
+ */
+bool vfio_file_enforced_coherent(struct file *file)
+{
+	struct vfio_device *device;
+	struct vfio_group *group;
+
+	group = vfio_group_from_file(file);
+	if (group)
+		return vfio_group_enforced_coherent(group);
+
+	device = vfio_device_from_file(file);
+	if (device)
+		return device_iommu_capable(device->dev,
+					    IOMMU_CAP_ENFORCE_CACHE_COHERENCY);
+
+	return true;
+}
+EXPORT_SYMBOL_GPL(vfio_file_enforced_coherent);
+
+static void vfio_device_file_set_kvm(struct file *file, struct kvm *kvm)
+{
+	struct vfio_device_file *df = file->private_data;
+
+	/*
+	 * The kvm is first recorded in the vfio_device_file, and will
+	 * be propagated to vfio_device::kvm when the file is bound to
+	 * iommufd successfully in the vfio device cdev path.
+	 */
+	spin_lock(&df->kvm_ref_lock);
+	df->kvm = kvm;
+	spin_unlock(&df->kvm_ref_lock);
+}
+
+/**
+ * vfio_file_set_kvm - Link a kvm with VFIO drivers
+ * @file: VFIO group file or VFIO device file
+ * @kvm: KVM to link
+ *
+ * When a VFIO device is first opened the KVM will be available in
+ * device->kvm if one was associated with the file.
+ */
+void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
+{
+	struct vfio_group *group;
+
+	group = vfio_group_from_file(file);
+	if (group)
+		vfio_group_set_kvm(group, kvm);
+
+	if (vfio_device_from_file(file))
+		vfio_device_file_set_kvm(file, kvm);
+}
+EXPORT_SYMBOL_GPL(vfio_file_set_kvm);
+
 /*
  * Sub-module support
  */
@@ -1172,6 +1409,9 @@ struct vfio_info_cap_header *vfio_info_cap_add(struct vfio_info_cap *caps,
 	void *buf;
 	struct vfio_info_cap_header *header, *tmp;
 
+	/* Ensure that the next capability struct will be aligned */
+	size = ALIGN(size, sizeof(u64));
+
 	buf = krealloc(caps->buf, caps->size + size, GFP_KERNEL);
 	if (!buf) {
 		kfree(caps->buf);
@@ -1205,6 +1445,9 @@ void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset)
 	struct vfio_info_cap_header *tmp;
 	void *buf = (void *)caps->buf;
 
+	/* Capability structs should start with proper alignment */
+	WARN_ON(!IS_ALIGNED(offset, sizeof(u64)));
+
 	for (tmp = buf; tmp->next; tmp = buf + tmp->next - offset)
 		tmp->next += offset;
 }
@@ -1415,9 +1658,16 @@ static int __init vfio_init(void)
 		goto err_dev_class;
 	}
 
+	ret = vfio_cdev_init(vfio.device_class);
+	if (ret)
+		goto err_alloc_dev_chrdev;
+
 	pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 	return 0;
 
+err_alloc_dev_chrdev:
+	class_destroy(vfio.device_class);
+	vfio.device_class = NULL;
 err_dev_class:
 	vfio_virqfd_exit();
 err_virqfd:
@@ -1428,6 +1678,7 @@ err_virqfd:
 static void __exit vfio_cleanup(void)
 {
 	ida_destroy(&vfio.device_ida);
+	vfio_cdev_cleanup();
 	class_destroy(vfio.device_class);
 	vfio.device_class = NULL;
 	vfio_virqfd_exit();