zig

vfio.h (71872B) - Raw

---

 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 /*
  * VFIO API definition
  *
  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
  *     Author: Alex Williamson <alex.williamson@redhat.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #ifndef VFIO_H
 #define VFIO_H
 
 #include <linux/types.h>
 #include <linux/ioctl.h>
 
 #define VFIO_API_VERSION	0
 
 
 /* Kernel & User level defines for VFIO IOCTLs. */
 
 /* Extensions */
 
 #define VFIO_TYPE1_IOMMU		1
 #define VFIO_SPAPR_TCE_IOMMU		2
 #define VFIO_TYPE1v2_IOMMU		3
 /*
  * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping).  This
  * capability is subject to change as groups are added or removed.
  */
 #define VFIO_DMA_CC_IOMMU		4
 
 /* Check if EEH is supported */
 #define VFIO_EEH			5
 
 /* Two-stage IOMMU */
 #define __VFIO_RESERVED_TYPE1_NESTING_IOMMU	6	/* Implies v2 */
 
 #define VFIO_SPAPR_TCE_v2_IOMMU		7
 
 /*
  * The No-IOMMU IOMMU offers no translation or isolation for devices and
  * supports no ioctls outside of VFIO_CHECK_EXTENSION.  Use of VFIO's No-IOMMU
  * code will taint the host kernel and should be used with extreme caution.
  */
 #define VFIO_NOIOMMU_IOMMU		8
 
 /* Supports VFIO_DMA_UNMAP_FLAG_ALL */
 #define VFIO_UNMAP_ALL			9
 
 /*
  * Supports the vaddr flag for DMA map and unmap.  Not supported for mediated
  * devices, so this capability is subject to change as groups are added or
  * removed.
  */
 #define VFIO_UPDATE_VADDR		10
 
 /*
  * The IOCTL interface is designed for extensibility by embedding the
  * structure length (argsz) and flags into structures passed between
  * kernel and userspace.  We therefore use the _IO() macro for these
  * defines to avoid implicitly embedding a size into the ioctl request.
  * As structure fields are added, argsz will increase to match and flag
  * bits will be defined to indicate additional fields with valid data.
  * It's *always* the caller's responsibility to indicate the size of
  * the structure passed by setting argsz appropriately.
  */
 
 #define VFIO_TYPE	(';')
 #define VFIO_BASE	100
 
 /*
  * For extension of INFO ioctls, VFIO makes use of a capability chain
  * designed after PCI/e capabilities.  A flag bit indicates whether
  * this capability chain is supported and a field defined in the fixed
  * structure defines the offset of the first capability in the chain.
  * This field is only valid when the corresponding bit in the flags
  * bitmap is set.  This offset field is relative to the start of the
  * INFO buffer, as is the next field within each capability header.
  * The id within the header is a shared address space per INFO ioctl,
  * while the version field is specific to the capability id.  The
  * contents following the header are specific to the capability id.
  */
 struct vfio_info_cap_header {
 	__u16	id;		/* Identifies capability */
 	__u16	version;	/* Version specific to the capability ID */
 	__u32	next;		/* Offset of next capability */
 };
 
 /*
  * Callers of INFO ioctls passing insufficiently sized buffers will see
  * the capability chain flag bit set, a zero value for the first capability
  * offset (if available within the provided argsz), and argsz will be
  * updated to report the necessary buffer size.  For compatibility, the
  * INFO ioctl will not report error in this case, but the capability chain
  * will not be available.
  */
 
 /* -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- */
 
 /**
  * VFIO_GET_API_VERSION - _IO(VFIO_TYPE, VFIO_BASE + 0)
  *
  * Report the version of the VFIO API.  This allows us to bump the entire
  * API version should we later need to add or change features in incompatible
  * ways.
  * Return: VFIO_API_VERSION
  * Availability: Always
  */
 #define VFIO_GET_API_VERSION		_IO(VFIO_TYPE, VFIO_BASE + 0)
 
 /**
  * VFIO_CHECK_EXTENSION - _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32)
  *
  * Check whether an extension is supported.
  * Return: 0 if not supported, 1 (or some other positive integer) if supported.
  * Availability: Always
  */
 #define VFIO_CHECK_EXTENSION		_IO(VFIO_TYPE, VFIO_BASE + 1)
 
 /**
  * VFIO_SET_IOMMU - _IOW(VFIO_TYPE, VFIO_BASE + 2, __s32)
  *
  * Set the iommu to the given type.  The type must be supported by an
  * iommu driver as verified by calling CHECK_EXTENSION using the same
  * type.  A group must be set to this file descriptor before this
  * ioctl is available.  The IOMMU interfaces enabled by this call are
  * specific to the value set.
  * Return: 0 on success, -errno on failure
  * Availability: When VFIO group attached
  */
 #define VFIO_SET_IOMMU			_IO(VFIO_TYPE, VFIO_BASE + 2)
 
 /* -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- */
 
 /**
  * VFIO_GROUP_GET_STATUS - _IOR(VFIO_TYPE, VFIO_BASE + 3,
  *						struct vfio_group_status)
  *
  * Retrieve information about the group.  Fills in provided
  * struct vfio_group_info.  Caller sets argsz.
  * Return: 0 on succes, -errno on failure.
  * Availability: Always
  */
 struct vfio_group_status {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_GROUP_FLAGS_VIABLE		(1 << 0)
 #define VFIO_GROUP_FLAGS_CONTAINER_SET	(1 << 1)
 };
 #define VFIO_GROUP_GET_STATUS		_IO(VFIO_TYPE, VFIO_BASE + 3)
 
 /**
  * VFIO_GROUP_SET_CONTAINER - _IOW(VFIO_TYPE, VFIO_BASE + 4, __s32)
  *
  * Set the container for the VFIO group to the open VFIO file
  * descriptor provided.  Groups may only belong to a single
  * container.  Containers may, at their discretion, support multiple
  * groups.  Only when a container is set are all of the interfaces
  * of the VFIO file descriptor and the VFIO group file descriptor
  * available to the user.
  * Return: 0 on success, -errno on failure.
  * Availability: Always
  */
 #define VFIO_GROUP_SET_CONTAINER	_IO(VFIO_TYPE, VFIO_BASE + 4)
 
 /**
  * VFIO_GROUP_UNSET_CONTAINER - _IO(VFIO_TYPE, VFIO_BASE + 5)
  *
  * Remove the group from the attached container.  This is the
  * opposite of the SET_CONTAINER call and returns the group to
  * an initial state.  All device file descriptors must be released
  * prior to calling this interface.  When removing the last group
  * from a container, the IOMMU will be disabled and all state lost,
  * effectively also returning the VFIO file descriptor to an initial
  * state.
  * Return: 0 on success, -errno on failure.
  * Availability: When attached to container
  */
 #define VFIO_GROUP_UNSET_CONTAINER	_IO(VFIO_TYPE, VFIO_BASE + 5)
 
 /**
  * VFIO_GROUP_GET_DEVICE_FD - _IOW(VFIO_TYPE, VFIO_BASE + 6, char)
  *
  * Return a new file descriptor for the device object described by
  * the provided string.  The string should match a device listed in
  * the devices subdirectory of the IOMMU group sysfs entry.  The
  * group containing the device must already be added to this context.
  * Return: new file descriptor on success, -errno on failure.
  * Availability: When attached to container
  */
 #define VFIO_GROUP_GET_DEVICE_FD	_IO(VFIO_TYPE, VFIO_BASE + 6)
 
 /* --------------- IOCTLs for DEVICE file descriptors --------------- */
 
 /**
  * VFIO_DEVICE_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 7,
  *						struct vfio_device_info)
  *
  * Retrieve information about the device.  Fills in provided
  * struct vfio_device_info.  Caller sets argsz.
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_info {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_DEVICE_FLAGS_RESET	(1 << 0)	/* Device supports reset */
 #define VFIO_DEVICE_FLAGS_PCI	(1 << 1)	/* vfio-pci device */
 #define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2)	/* vfio-platform device */
 #define VFIO_DEVICE_FLAGS_AMBA  (1 << 3)	/* vfio-amba device */
 #define VFIO_DEVICE_FLAGS_CCW	(1 << 4)	/* vfio-ccw device */
 #define VFIO_DEVICE_FLAGS_AP	(1 << 5)	/* vfio-ap device */
 #define VFIO_DEVICE_FLAGS_FSL_MC (1 << 6)	/* vfio-fsl-mc device */
 #define VFIO_DEVICE_FLAGS_CAPS	(1 << 7)	/* Info supports caps */
 #define VFIO_DEVICE_FLAGS_CDX	(1 << 8)	/* vfio-cdx device */
 	__u32	num_regions;	/* Max region index + 1 */
 	__u32	num_irqs;	/* Max IRQ index + 1 */
 	__u32   cap_offset;	/* Offset within info struct of first cap */
 	__u32   pad;
 };
 #define VFIO_DEVICE_GET_INFO		_IO(VFIO_TYPE, VFIO_BASE + 7)
 
 /*
  * Vendor driver using Mediated device framework should provide device_api
  * attribute in supported type attribute groups. Device API string should be one
  * of the following corresponding to device flags in vfio_device_info structure.
  */
 
 #define VFIO_DEVICE_API_PCI_STRING		"vfio-pci"
 #define VFIO_DEVICE_API_PLATFORM_STRING		"vfio-platform"
 #define VFIO_DEVICE_API_AMBA_STRING		"vfio-amba"
 #define VFIO_DEVICE_API_CCW_STRING		"vfio-ccw"
 #define VFIO_DEVICE_API_AP_STRING		"vfio-ap"
 
 /*
  * The following capabilities are unique to s390 zPCI devices.  Their contents
  * are further-defined in vfio_zdev.h
  */
 #define VFIO_DEVICE_INFO_CAP_ZPCI_BASE		1
 #define VFIO_DEVICE_INFO_CAP_ZPCI_GROUP		2
 #define VFIO_DEVICE_INFO_CAP_ZPCI_UTIL		3
 #define VFIO_DEVICE_INFO_CAP_ZPCI_PFIP		4
 
 /*
  * The following VFIO_DEVICE_INFO capability reports support for PCIe AtomicOp
  * completion to the root bus with supported widths provided via flags.
  */
 #define VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP	5
 struct vfio_device_info_cap_pci_atomic_comp {
 	struct vfio_info_cap_header header;
 	__u32 flags;
 #define VFIO_PCI_ATOMIC_COMP32	(1 << 0)
 #define VFIO_PCI_ATOMIC_COMP64	(1 << 1)
 #define VFIO_PCI_ATOMIC_COMP128	(1 << 2)
 	__u32 reserved;
 };
 
 /**
  * VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8,
  *				       struct vfio_region_info)
  *
  * Retrieve information about a device region.  Caller provides
  * struct vfio_region_info with index value set.  Caller sets argsz.
  * Implementation of region mapping is bus driver specific.  This is
  * intended to describe MMIO, I/O port, as well as bus specific
  * regions (ex. PCI config space).  Zero sized regions may be used
  * to describe unimplemented regions (ex. unimplemented PCI BARs).
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_region_info {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_REGION_INFO_FLAG_READ	(1 << 0) /* Region supports read */
 #define VFIO_REGION_INFO_FLAG_WRITE	(1 << 1) /* Region supports write */
 #define VFIO_REGION_INFO_FLAG_MMAP	(1 << 2) /* Region supports mmap */
 #define VFIO_REGION_INFO_FLAG_CAPS	(1 << 3) /* Info supports caps */
 	__u32	index;		/* Region index */
 	__u32	cap_offset;	/* Offset within info struct of first cap */
 	__aligned_u64	size;	/* Region size (bytes) */
 	__aligned_u64	offset;	/* Region offset from start of device fd */
 };
 #define VFIO_DEVICE_GET_REGION_INFO	_IO(VFIO_TYPE, VFIO_BASE + 8)
 
 /*
  * The sparse mmap capability allows finer granularity of specifying areas
  * within a region with mmap support.  When specified, the user should only
  * mmap the offset ranges specified by the areas array.  mmaps outside of the
  * areas specified may fail (such as the range covering a PCI MSI-X table) or
  * may result in improper device behavior.
  *
  * The structures below define version 1 of this capability.
  */
 #define VFIO_REGION_INFO_CAP_SPARSE_MMAP	1
 
 struct vfio_region_sparse_mmap_area {
 	__aligned_u64	offset;	/* Offset of mmap'able area within region */
 	__aligned_u64	size;	/* Size of mmap'able area */
 };
 
 struct vfio_region_info_cap_sparse_mmap {
 	struct vfio_info_cap_header header;
 	__u32	nr_areas;
 	__u32	reserved;
 	struct vfio_region_sparse_mmap_area areas[];
 };
 
 /*
  * The device specific type capability allows regions unique to a specific
  * device or class of devices to be exposed.  This helps solve the problem for
  * vfio bus drivers of defining which region indexes correspond to which region
  * on the device, without needing to resort to static indexes, as done by
  * vfio-pci.  For instance, if we were to go back in time, we might remove
  * VFIO_PCI_VGA_REGION_INDEX and let vfio-pci simply define that all indexes
  * greater than or equal to VFIO_PCI_NUM_REGIONS are device specific and we'd
  * make a "VGA" device specific type to describe the VGA access space.  This
  * means that non-VGA devices wouldn't need to waste this index, and thus the
  * address space associated with it due to implementation of device file
  * descriptor offsets in vfio-pci.
  *
  * The current implementation is now part of the user ABI, so we can't use this
  * for VGA, but there are other upcoming use cases, such as opregions for Intel
  * IGD devices and framebuffers for vGPU devices.  We missed VGA, but we'll
  * use this for future additions.
  *
  * The structure below defines version 1 of this capability.
  */
 #define VFIO_REGION_INFO_CAP_TYPE	2
 
 struct vfio_region_info_cap_type {
 	struct vfio_info_cap_header header;
 	__u32 type;	/* global per bus driver */
 	__u32 subtype;	/* type specific */
 };
 
 /*
  * List of region types, global per bus driver.
  * If you introduce a new type, please add it here.
  */
 
 /* PCI region type containing a PCI vendor part */
 #define VFIO_REGION_TYPE_PCI_VENDOR_TYPE	(1 << 31)
 #define VFIO_REGION_TYPE_PCI_VENDOR_MASK	(0xffff)
 #define VFIO_REGION_TYPE_GFX                    (1)
 #define VFIO_REGION_TYPE_CCW			(2)
 #define VFIO_REGION_TYPE_MIGRATION_DEPRECATED   (3)
 
 /* sub-types for VFIO_REGION_TYPE_PCI_* */
 
 /* 8086 vendor PCI sub-types */
 #define VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION	(1)
 #define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG	(2)
 #define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG	(3)
 
 /* 10de vendor PCI sub-types */
 /*
  * NVIDIA GPU NVlink2 RAM is coherent RAM mapped onto the host address space.
  *
  * Deprecated, region no longer provided
  */
 #define VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM	(1)
 
 /* 1014 vendor PCI sub-types */
 /*
  * IBM NPU NVlink2 ATSD (Address Translation Shootdown) register of NPU
  * to do TLB invalidation on a GPU.
  *
  * Deprecated, region no longer provided
  */
 #define VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD	(1)
 
 /* sub-types for VFIO_REGION_TYPE_GFX */
 #define VFIO_REGION_SUBTYPE_GFX_EDID            (1)
 
 /**
  * struct vfio_region_gfx_edid - EDID region layout.
  *
  * Set display link state and EDID blob.
  *
  * The EDID blob has monitor information such as brand, name, serial
  * number, physical size, supported video modes and more.
  *
  * This special region allows userspace (typically qemu) set a virtual
  * EDID for the virtual monitor, which allows a flexible display
  * configuration.
  *
  * For the edid blob spec look here:
  *    https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
  *
  * On linux systems you can find the EDID blob in sysfs:
  *    /sys/class/drm/${card}/${connector}/edid
  *
  * You can use the edid-decode ulility (comes with xorg-x11-utils) to
  * decode the EDID blob.
  *
  * @edid_offset: location of the edid blob, relative to the
  *               start of the region (readonly).
  * @edid_max_size: max size of the edid blob (readonly).
  * @edid_size: actual edid size (read/write).
  * @link_state: display link state (read/write).
  * VFIO_DEVICE_GFX_LINK_STATE_UP: Monitor is turned on.
  * VFIO_DEVICE_GFX_LINK_STATE_DOWN: Monitor is turned off.
  * @max_xres: max display width (0 == no limitation, readonly).
  * @max_yres: max display height (0 == no limitation, readonly).
  *
  * EDID update protocol:
  *   (1) set link-state to down.
  *   (2) update edid blob and size.
  *   (3) set link-state to up.
  */
 struct vfio_region_gfx_edid {
 	__u32 edid_offset;
 	__u32 edid_max_size;
 	__u32 edid_size;
 	__u32 max_xres;
 	__u32 max_yres;
 	__u32 link_state;
 #define VFIO_DEVICE_GFX_LINK_STATE_UP    1
 #define VFIO_DEVICE_GFX_LINK_STATE_DOWN  2
 };
 
 /* sub-types for VFIO_REGION_TYPE_CCW */
 #define VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD	(1)
 #define VFIO_REGION_SUBTYPE_CCW_SCHIB		(2)
 #define VFIO_REGION_SUBTYPE_CCW_CRW		(3)
 
 /* sub-types for VFIO_REGION_TYPE_MIGRATION */
 #define VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED (1)
 
 struct vfio_device_migration_info {
 	__u32 device_state;         /* VFIO device state */
 #define VFIO_DEVICE_STATE_V1_STOP      (0)
 #define VFIO_DEVICE_STATE_V1_RUNNING   (1 << 0)
 #define VFIO_DEVICE_STATE_V1_SAVING    (1 << 1)
 #define VFIO_DEVICE_STATE_V1_RESUMING  (1 << 2)
 #define VFIO_DEVICE_STATE_MASK      (VFIO_DEVICE_STATE_V1_RUNNING | \
 				     VFIO_DEVICE_STATE_V1_SAVING |  \
 				     VFIO_DEVICE_STATE_V1_RESUMING)
 
 #define VFIO_DEVICE_STATE_VALID(state) \
 	(state & VFIO_DEVICE_STATE_V1_RESUMING ? \
 	(state & VFIO_DEVICE_STATE_MASK) == VFIO_DEVICE_STATE_V1_RESUMING : 1)
 
 #define VFIO_DEVICE_STATE_IS_ERROR(state) \
 	((state & VFIO_DEVICE_STATE_MASK) == (VFIO_DEVICE_STATE_V1_SAVING | \
 					      VFIO_DEVICE_STATE_V1_RESUMING))
 
 #define VFIO_DEVICE_STATE_SET_ERROR(state) \
 	((state & ~VFIO_DEVICE_STATE_MASK) | VFIO_DEVICE_STATE_V1_SAVING | \
 					     VFIO_DEVICE_STATE_V1_RESUMING)
 
 	__u32 reserved;
 	__aligned_u64 pending_bytes;
 	__aligned_u64 data_offset;
 	__aligned_u64 data_size;
 };
 
 /*
  * The MSIX mappable capability informs that MSIX data of a BAR can be mmapped
  * which allows direct access to non-MSIX registers which happened to be within
  * the same system page.
  *
  * Even though the userspace gets direct access to the MSIX data, the existing
  * VFIO_DEVICE_SET_IRQS interface must still be used for MSIX configuration.
  */
 #define VFIO_REGION_INFO_CAP_MSIX_MAPPABLE	3
 
 /*
  * Capability with compressed real address (aka SSA - small system address)
  * where GPU RAM is mapped on a system bus. Used by a GPU for DMA routing
  * and by the userspace to associate a NVLink bridge with a GPU.
  *
  * Deprecated, capability no longer provided
  */
 #define VFIO_REGION_INFO_CAP_NVLINK2_SSATGT	4
 
 struct vfio_region_info_cap_nvlink2_ssatgt {
 	struct vfio_info_cap_header header;
 	__aligned_u64 tgt;
 };
 
 /*
  * Capability with an NVLink link speed. The value is read by
  * the NVlink2 bridge driver from the bridge's "ibm,nvlink-speed"
  * property in the device tree. The value is fixed in the hardware
  * and failing to provide the correct value results in the link
  * not working with no indication from the driver why.
  *
  * Deprecated, capability no longer provided
  */
 #define VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD	5
 
 struct vfio_region_info_cap_nvlink2_lnkspd {
 	struct vfio_info_cap_header header;
 	__u32 link_speed;
 	__u32 __pad;
 };
 
 /**
  * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
  *				    struct vfio_irq_info)
  *
  * Retrieve information about a device IRQ.  Caller provides
  * struct vfio_irq_info with index value set.  Caller sets argsz.
  * Implementation of IRQ mapping is bus driver specific.  Indexes
  * using multiple IRQs are primarily intended to support MSI-like
  * interrupt blocks.  Zero count irq blocks may be used to describe
  * unimplemented interrupt types.
  *
  * The EVENTFD flag indicates the interrupt index supports eventfd based
  * signaling.
  *
  * The MASKABLE flags indicates the index supports MASK and UNMASK
  * actions described below.
  *
  * AUTOMASKED indicates that after signaling, the interrupt line is
  * automatically masked by VFIO and the user needs to unmask the line
  * to receive new interrupts.  This is primarily intended to distinguish
  * level triggered interrupts.
  *
  * The NORESIZE flag indicates that the interrupt lines within the index
  * are setup as a set and new subindexes cannot be enabled without first
  * disabling the entire index.  This is used for interrupts like PCI MSI
  * and MSI-X where the driver may only use a subset of the available
  * indexes, but VFIO needs to enable a specific number of vectors
  * upfront.  In the case of MSI-X, where the user can enable MSI-X and
  * then add and unmask vectors, it's up to userspace to make the decision
  * whether to allocate the maximum supported number of vectors or tear
  * down setup and incrementally increase the vectors as each is enabled.
  * Absence of the NORESIZE flag indicates that vectors can be enabled
  * and disabled dynamically without impacting other vectors within the
  * index.
  */
 struct vfio_irq_info {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_IRQ_INFO_EVENTFD		(1 << 0)
 #define VFIO_IRQ_INFO_MASKABLE		(1 << 1)
 #define VFIO_IRQ_INFO_AUTOMASKED	(1 << 2)
 #define VFIO_IRQ_INFO_NORESIZE		(1 << 3)
 	__u32	index;		/* IRQ index */
 	__u32	count;		/* Number of IRQs within this index */
 };
 #define VFIO_DEVICE_GET_IRQ_INFO	_IO(VFIO_TYPE, VFIO_BASE + 9)
 
 /**
  * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set)
  *
  * Set signaling, masking, and unmasking of interrupts.  Caller provides
  * struct vfio_irq_set with all fields set.  'start' and 'count' indicate
  * the range of subindexes being specified.
  *
  * The DATA flags specify the type of data provided.  If DATA_NONE, the
  * operation performs the specified action immediately on the specified
  * interrupt(s).  For example, to unmask AUTOMASKED interrupt [0,0]:
  * flags = (DATA_NONE|ACTION_UNMASK), index = 0, start = 0, count = 1.
  *
  * DATA_BOOL allows sparse support for the same on arrays of interrupts.
  * For example, to mask interrupts [0,1] and [0,3] (but not [0,2]):
  * flags = (DATA_BOOL|ACTION_MASK), index = 0, start = 1, count = 3,
  * data = {1,0,1}
  *
  * DATA_EVENTFD binds the specified ACTION to the provided __s32 eventfd.
  * A value of -1 can be used to either de-assign interrupts if already
  * assigned or skip un-assigned interrupts.  For example, to set an eventfd
  * to be trigger for interrupts [0,0] and [0,2]:
  * flags = (DATA_EVENTFD|ACTION_TRIGGER), index = 0, start = 0, count = 3,
  * data = {fd1, -1, fd2}
  * If index [0,1] is previously set, two count = 1 ioctls calls would be
  * required to set [0,0] and [0,2] without changing [0,1].
  *
  * Once a signaling mechanism is set, DATA_BOOL or DATA_NONE can be used
  * with ACTION_TRIGGER to perform kernel level interrupt loopback testing
  * from userspace (ie. simulate hardware triggering).
  *
  * Setting of an event triggering mechanism to userspace for ACTION_TRIGGER
  * enables the interrupt index for the device.  Individual subindex interrupts
  * can be disabled using the -1 value for DATA_EVENTFD or the index can be
  * disabled as a whole with: flags = (DATA_NONE|ACTION_TRIGGER), count = 0.
  *
  * Note that ACTION_[UN]MASK specify user->kernel signaling (irqfds) while
  * ACTION_TRIGGER specifies kernel->user signaling.
  */
 struct vfio_irq_set {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_IRQ_SET_DATA_NONE		(1 << 0) /* Data not present */
 #define VFIO_IRQ_SET_DATA_BOOL		(1 << 1) /* Data is bool (u8) */
 #define VFIO_IRQ_SET_DATA_EVENTFD	(1 << 2) /* Data is eventfd (s32) */
 #define VFIO_IRQ_SET_ACTION_MASK	(1 << 3) /* Mask interrupt */
 #define VFIO_IRQ_SET_ACTION_UNMASK	(1 << 4) /* Unmask interrupt */
 #define VFIO_IRQ_SET_ACTION_TRIGGER	(1 << 5) /* Trigger interrupt */
 	__u32	index;
 	__u32	start;
 	__u32	count;
 	__u8	data[];
 };
 #define VFIO_DEVICE_SET_IRQS		_IO(VFIO_TYPE, VFIO_BASE + 10)
 
 #define VFIO_IRQ_SET_DATA_TYPE_MASK	(VFIO_IRQ_SET_DATA_NONE | \
 					 VFIO_IRQ_SET_DATA_BOOL | \
 					 VFIO_IRQ_SET_DATA_EVENTFD)
 #define VFIO_IRQ_SET_ACTION_TYPE_MASK	(VFIO_IRQ_SET_ACTION_MASK | \
 					 VFIO_IRQ_SET_ACTION_UNMASK | \
 					 VFIO_IRQ_SET_ACTION_TRIGGER)
 /**
  * VFIO_DEVICE_RESET - _IO(VFIO_TYPE, VFIO_BASE + 11)
  *
  * Reset a device.
  */
 #define VFIO_DEVICE_RESET		_IO(VFIO_TYPE, VFIO_BASE + 11)
 
 /*
  * The VFIO-PCI bus driver makes use of the following fixed region and
  * IRQ index mapping.  Unimplemented regions return a size of zero.
  * Unimplemented IRQ types return a count of zero.
  */
 
 enum {
 	VFIO_PCI_BAR0_REGION_INDEX,
 	VFIO_PCI_BAR1_REGION_INDEX,
 	VFIO_PCI_BAR2_REGION_INDEX,
 	VFIO_PCI_BAR3_REGION_INDEX,
 	VFIO_PCI_BAR4_REGION_INDEX,
 	VFIO_PCI_BAR5_REGION_INDEX,
 	VFIO_PCI_ROM_REGION_INDEX,
 	VFIO_PCI_CONFIG_REGION_INDEX,
 	/*
 	 * Expose VGA regions defined for PCI base class 03, subclass 00.
 	 * This includes I/O port ranges 0x3b0 to 0x3bb and 0x3c0 to 0x3df
 	 * as well as the MMIO range 0xa0000 to 0xbffff.  Each implemented
 	 * range is found at it's identity mapped offset from the region
 	 * offset, for example 0x3b0 is region_info.offset + 0x3b0.  Areas
 	 * between described ranges are unimplemented.
 	 */
 	VFIO_PCI_VGA_REGION_INDEX,
 	VFIO_PCI_NUM_REGIONS = 9 /* Fixed user ABI, region indexes >=9 use */
 				 /* device specific cap to define content. */
 };
 
 enum {
 	VFIO_PCI_INTX_IRQ_INDEX,
 	VFIO_PCI_MSI_IRQ_INDEX,
 	VFIO_PCI_MSIX_IRQ_INDEX,
 	VFIO_PCI_ERR_IRQ_INDEX,
 	VFIO_PCI_REQ_IRQ_INDEX,
 	VFIO_PCI_NUM_IRQS
 };
 
 /*
  * The vfio-ccw bus driver makes use of the following fixed region and
  * IRQ index mapping. Unimplemented regions return a size of zero.
  * Unimplemented IRQ types return a count of zero.
  */
 
 enum {
 	VFIO_CCW_CONFIG_REGION_INDEX,
 	VFIO_CCW_NUM_REGIONS
 };
 
 enum {
 	VFIO_CCW_IO_IRQ_INDEX,
 	VFIO_CCW_CRW_IRQ_INDEX,
 	VFIO_CCW_REQ_IRQ_INDEX,
 	VFIO_CCW_NUM_IRQS
 };
 
 /*
  * The vfio-ap bus driver makes use of the following IRQ index mapping.
  * Unimplemented IRQ types return a count of zero.
  */
 enum {
 	VFIO_AP_REQ_IRQ_INDEX,
 	VFIO_AP_NUM_IRQS
 };
 
 /**
  * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 12,
  *					      struct vfio_pci_hot_reset_info)
  *
  * This command is used to query the affected devices in the hot reset for
  * a given device.
  *
  * This command always reports the segment, bus, and devfn information for
  * each affected device, and selectively reports the group_id or devid per
  * the way how the calling device is opened.
  *
  *	- If the calling device is opened via the traditional group/container
  *	  API, group_id is reported.  User should check if it has owned all
  *	  the affected devices and provides a set of group fds to prove the
  *	  ownership in VFIO_DEVICE_PCI_HOT_RESET ioctl.
  *
  *	- If the calling device is opened as a cdev, devid is reported.
  *	  Flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set to indicate this
  *	  data type.  All the affected devices should be represented in
  *	  the dev_set, ex. bound to a vfio driver, and also be owned by
  *	  this interface which is determined by the following conditions:
  *	  1) Has a valid devid within the iommufd_ctx of the calling device.
  *	     Ownership cannot be determined across separate iommufd_ctx and
  *	     the cdev calling conventions do not support a proof-of-ownership
  *	     model as provided in the legacy group interface.  In this case
  *	     valid devid with value greater than zero is provided in the return
  *	     structure.
  *	  2) Does not have a valid devid within the iommufd_ctx of the calling
  *	     device, but belongs to the same IOMMU group as the calling device
  *	     or another opened device that has a valid devid within the
  *	     iommufd_ctx of the calling device.  This provides implicit ownership
  *	     for devices within the same DMA isolation context.  In this case
  *	     the devid value of VFIO_PCI_DEVID_OWNED is provided in the return
  *	     structure.
  *
  *	  A devid value of VFIO_PCI_DEVID_NOT_OWNED is provided in the return
  *	  structure for affected devices where device is NOT represented in the
  *	  dev_set or ownership is not available.  Such devices prevent the use
  *	  of VFIO_DEVICE_PCI_HOT_RESET ioctl outside of the proof-of-ownership
  *	  calling conventions (ie. via legacy group accessed devices).  Flag
  *	  VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED would be set when all the
  *	  affected devices are represented in the dev_set and also owned by
  *	  the user.  This flag is available only when
  *	  flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set, otherwise reserved.
  *	  When set, user could invoke VFIO_DEVICE_PCI_HOT_RESET with a zero
  *	  length fd array on the calling device as the ownership is validated
  *	  by iommufd_ctx.
  *
  * Return: 0 on success, -errno on failure:
  *	-enospc = insufficient buffer, -enodev = unsupported for device.
  */
 struct vfio_pci_dependent_device {
 	union {
 		__u32   group_id;
 		__u32	devid;
 #define VFIO_PCI_DEVID_OWNED		0
 #define VFIO_PCI_DEVID_NOT_OWNED	-1
 	};
 	__u16	segment;
 	__u8	bus;
 	__u8	devfn; /* Use PCI_SLOT/PCI_FUNC */
 };
 
 struct vfio_pci_hot_reset_info {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_PCI_HOT_RESET_FLAG_DEV_ID		(1 << 0)
 #define VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED	(1 << 1)
 	__u32	count;
 	struct vfio_pci_dependent_device	devices[];
 };
 
 #define VFIO_DEVICE_GET_PCI_HOT_RESET_INFO	_IO(VFIO_TYPE, VFIO_BASE + 12)
 
 /**
  * VFIO_DEVICE_PCI_HOT_RESET - _IOW(VFIO_TYPE, VFIO_BASE + 13,
  *				    struct vfio_pci_hot_reset)
  *
  * A PCI hot reset results in either a bus or slot reset which may affect
  * other devices sharing the bus/slot.  The calling user must have
  * ownership of the full set of affected devices as determined by the
  * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO ioctl.
  *
  * When called on a device file descriptor acquired through the vfio
  * group interface, the user is required to provide proof of ownership
  * of those affected devices via the group_fds array in struct
  * vfio_pci_hot_reset.
  *
  * When called on a direct cdev opened vfio device, the flags field of
  * struct vfio_pci_hot_reset_info reports the ownership status of the
  * affected devices and this ioctl must be called with an empty group_fds
  * array.  See above INFO ioctl definition for ownership requirements.
  *
  * Mixed usage of legacy groups and cdevs across the set of affected
  * devices is not supported.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_pci_hot_reset {
 	__u32	argsz;
 	__u32	flags;
 	__u32	count;
 	__s32	group_fds[];
 };
 
 #define VFIO_DEVICE_PCI_HOT_RESET	_IO(VFIO_TYPE, VFIO_BASE + 13)
 
 /**
  * VFIO_DEVICE_QUERY_GFX_PLANE - _IOW(VFIO_TYPE, VFIO_BASE + 14,
  *                                    struct vfio_device_query_gfx_plane)
  *
  * Set the drm_plane_type and flags, then retrieve the gfx plane info.
  *
  * flags supported:
  * - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_DMABUF are set
  *   to ask if the mdev supports dma-buf. 0 on support, -EINVAL on no
  *   support for dma-buf.
  * - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_REGION are set
  *   to ask if the mdev supports region. 0 on support, -EINVAL on no
  *   support for region.
  * - VFIO_GFX_PLANE_TYPE_DMABUF or VFIO_GFX_PLANE_TYPE_REGION is set
  *   with each call to query the plane info.
  * - Others are invalid and return -EINVAL.
  *
  * Note:
  * 1. Plane could be disabled by guest. In that case, success will be
  *    returned with zero-initialized drm_format, size, width and height
  *    fields.
  * 2. x_hot/y_hot is set to 0xFFFFFFFF if no hotspot information available
  *
  * Return: 0 on success, -errno on other failure.
  */
 struct vfio_device_gfx_plane_info {
 	__u32 argsz;
 	__u32 flags;
 #define VFIO_GFX_PLANE_TYPE_PROBE (1 << 0)
 #define VFIO_GFX_PLANE_TYPE_DMABUF (1 << 1)
 #define VFIO_GFX_PLANE_TYPE_REGION (1 << 2)
 	/* in */
 	__u32 drm_plane_type;	/* type of plane: DRM_PLANE_TYPE_* */
 	/* out */
 	__u32 drm_format;	/* drm format of plane */
 	__aligned_u64 drm_format_mod;   /* tiled mode */
 	__u32 width;	/* width of plane */
 	__u32 height;	/* height of plane */
 	__u32 stride;	/* stride of plane */
 	__u32 size;	/* size of plane in bytes, align on page*/
 	__u32 x_pos;	/* horizontal position of cursor plane */
 	__u32 y_pos;	/* vertical position of cursor plane*/
 	__u32 x_hot;    /* horizontal position of cursor hotspot */
 	__u32 y_hot;    /* vertical position of cursor hotspot */
 	union {
 		__u32 region_index;	/* region index */
 		__u32 dmabuf_id;	/* dma-buf id */
 	};
 	__u32 reserved;
 };
 
 #define VFIO_DEVICE_QUERY_GFX_PLANE _IO(VFIO_TYPE, VFIO_BASE + 14)
 
 /**
  * VFIO_DEVICE_GET_GFX_DMABUF - _IOW(VFIO_TYPE, VFIO_BASE + 15, __u32)
  *
  * Return a new dma-buf file descriptor for an exposed guest framebuffer
  * described by the provided dmabuf_id. The dmabuf_id is returned from VFIO_
  * DEVICE_QUERY_GFX_PLANE as a token of the exposed guest framebuffer.
  */
 
 #define VFIO_DEVICE_GET_GFX_DMABUF _IO(VFIO_TYPE, VFIO_BASE + 15)
 
 /**
  * VFIO_DEVICE_IOEVENTFD - _IOW(VFIO_TYPE, VFIO_BASE + 16,
  *                              struct vfio_device_ioeventfd)
  *
  * Perform a write to the device at the specified device fd offset, with
  * the specified data and width when the provided eventfd is triggered.
  * vfio bus drivers may not support this for all regions, for all widths,
  * or at all.  vfio-pci currently only enables support for BAR regions,
  * excluding the MSI-X vector table.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_ioeventfd {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_DEVICE_IOEVENTFD_8		(1 << 0) /* 1-byte write */
 #define VFIO_DEVICE_IOEVENTFD_16	(1 << 1) /* 2-byte write */
 #define VFIO_DEVICE_IOEVENTFD_32	(1 << 2) /* 4-byte write */
 #define VFIO_DEVICE_IOEVENTFD_64	(1 << 3) /* 8-byte write */
 #define VFIO_DEVICE_IOEVENTFD_SIZE_MASK	(0xf)
 	__aligned_u64	offset;		/* device fd offset of write */
 	__aligned_u64	data;		/* data to be written */
 	__s32	fd;			/* -1 for de-assignment */
 	__u32	reserved;
 };
 
 #define VFIO_DEVICE_IOEVENTFD		_IO(VFIO_TYPE, VFIO_BASE + 16)
 
 /**
  * VFIO_DEVICE_FEATURE - _IOWR(VFIO_TYPE, VFIO_BASE + 17,
  *			       struct vfio_device_feature)
  *
  * Get, set, or probe feature data of the device.  The feature is selected
  * using the FEATURE_MASK portion of the flags field.  Support for a feature
  * can be probed by setting both the FEATURE_MASK and PROBE bits.  A probe
  * may optionally include the GET and/or SET bits to determine read vs write
  * access of the feature respectively.  Probing a feature will return success
  * if the feature is supported and all of the optionally indicated GET/SET
  * methods are supported.  The format of the data portion of the structure is
  * specific to the given feature.  The data portion is not required for
  * probing.  GET and SET are mutually exclusive, except for use with PROBE.
  *
  * Return 0 on success, -errno on failure.
  */
 struct vfio_device_feature {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_DEVICE_FEATURE_MASK	(0xffff) /* 16-bit feature index */
 #define VFIO_DEVICE_FEATURE_GET		(1 << 16) /* Get feature into data[] */
 #define VFIO_DEVICE_FEATURE_SET		(1 << 17) /* Set feature from data[] */
 #define VFIO_DEVICE_FEATURE_PROBE	(1 << 18) /* Probe feature support */
 	__u8	data[];
 };
 
 #define VFIO_DEVICE_FEATURE		_IO(VFIO_TYPE, VFIO_BASE + 17)
 
 /*
  * VFIO_DEVICE_BIND_IOMMUFD - _IOR(VFIO_TYPE, VFIO_BASE + 18,
  *				   struct vfio_device_bind_iommufd)
  * @argsz:	 User filled size of this data.
  * @flags:	 Must be 0.
  * @iommufd:	 iommufd to bind.
  * @out_devid:	 The device id generated by this bind. devid is a handle for
  *		 this device/iommufd bond and can be used in IOMMUFD commands.
  *
  * Bind a vfio_device to the specified iommufd.
  *
  * User is restricted from accessing the device before the binding operation
  * is completed.  Only allowed on cdev fds.
  *
  * Unbind is automatically conducted when device fd is closed.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_bind_iommufd {
 	__u32		argsz;
 	__u32		flags;
 	__s32		iommufd;
 	__u32		out_devid;
 };
 
 #define VFIO_DEVICE_BIND_IOMMUFD	_IO(VFIO_TYPE, VFIO_BASE + 18)
 
 /*
  * VFIO_DEVICE_ATTACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 19,
  *					struct vfio_device_attach_iommufd_pt)
  * @argsz:	User filled size of this data.
  * @flags:	Must be 0.
  * @pt_id:	Input the target id which can represent an ioas or a hwpt
  *		allocated via iommufd subsystem.
  *		Output the input ioas id or the attached hwpt id which could
  *		be the specified hwpt itself or a hwpt automatically created
  *		for the specified ioas by kernel during the attachment.
  *
  * Associate the device with an address space within the bound iommufd.
  * Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close.  This is only
  * allowed on cdev fds.
  *
  * If a vfio device is currently attached to a valid hw_pagetable, without doing
  * a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl
  * passing in another hw_pagetable (hwpt) id is allowed. This action, also known
  * as a hw_pagetable replacement, will replace the device's currently attached
  * hw_pagetable with a new hw_pagetable corresponding to the given pt_id.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_attach_iommufd_pt {
 	__u32	argsz;
 	__u32	flags;
 	__u32	pt_id;
 };
 
 #define VFIO_DEVICE_ATTACH_IOMMUFD_PT		_IO(VFIO_TYPE, VFIO_BASE + 19)
 
 /*
  * VFIO_DEVICE_DETACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 20,
  *					struct vfio_device_detach_iommufd_pt)
  * @argsz:	User filled size of this data.
  * @flags:	Must be 0.
  *
  * Remove the association of the device and its current associated address
  * space.  After it, the device should be in a blocking DMA state.  This is only
  * allowed on cdev fds.
  *
  * Return: 0 on success, -errno on failure.
  */
 struct vfio_device_detach_iommufd_pt {
 	__u32	argsz;
 	__u32	flags;
 };
 
 #define VFIO_DEVICE_DETACH_IOMMUFD_PT		_IO(VFIO_TYPE, VFIO_BASE + 20)
 
 /*
  * Provide support for setting a PCI VF Token, which is used as a shared
  * secret between PF and VF drivers.  This feature may only be set on a
  * PCI SR-IOV PF when SR-IOV is enabled on the PF and there are no existing
  * open VFs.  Data provided when setting this feature is a 16-byte array
  * (__u8 b[16]), representing a UUID.
  */
 #define VFIO_DEVICE_FEATURE_PCI_VF_TOKEN	(0)
 
 /*
  * Indicates the device can support the migration API through
  * VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE. If this GET succeeds, the RUNNING and
  * ERROR states are always supported. Support for additional states is
  * indicated via the flags field; at least VFIO_MIGRATION_STOP_COPY must be
  * set.
  *
  * VFIO_MIGRATION_STOP_COPY means that STOP, STOP_COPY and
  * RESUMING are supported.
  *
  * VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P means that RUNNING_P2P
  * is supported in addition to the STOP_COPY states.
  *
  * VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_PRE_COPY means that
  * PRE_COPY is supported in addition to the STOP_COPY states.
  *
  * VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY
  * means that RUNNING_P2P, PRE_COPY and PRE_COPY_P2P are supported
  * in addition to the STOP_COPY states.
  *
  * Other combinations of flags have behavior to be defined in the future.
  */
 struct vfio_device_feature_migration {
 	__aligned_u64 flags;
 #define VFIO_MIGRATION_STOP_COPY	(1 << 0)
 #define VFIO_MIGRATION_P2P		(1 << 1)
 #define VFIO_MIGRATION_PRE_COPY		(1 << 2)
 };
 #define VFIO_DEVICE_FEATURE_MIGRATION 1
 
 /*
  * Upon VFIO_DEVICE_FEATURE_SET, execute a migration state change on the VFIO
  * device. The new state is supplied in device_state, see enum
  * vfio_device_mig_state for details
  *
  * The kernel migration driver must fully transition the device to the new state
  * value before the operation returns to the user.
  *
  * The kernel migration driver must not generate asynchronous device state
  * transitions outside of manipulation by the user or the VFIO_DEVICE_RESET
  * ioctl as described above.
  *
  * If this function fails then current device_state may be the original
  * operating state or some other state along the combination transition path.
  * The user can then decide if it should execute a VFIO_DEVICE_RESET, attempt
  * to return to the original state, or attempt to return to some other state
  * such as RUNNING or STOP.
  *
  * If the new_state starts a new data transfer session then the FD associated
  * with that session is returned in data_fd. The user is responsible to close
  * this FD when it is finished. The user must consider the migration data stream
  * carried over the FD to be opaque and must preserve the byte order of the
  * stream. The user is not required to preserve buffer segmentation when writing
  * the data stream during the RESUMING operation.
  *
  * Upon VFIO_DEVICE_FEATURE_GET, get the current migration state of the VFIO
  * device, data_fd will be -1.
  */
 struct vfio_device_feature_mig_state {
 	__u32 device_state; /* From enum vfio_device_mig_state */
 	__s32 data_fd;
 };
 #define VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE 2
 
 /*
  * The device migration Finite State Machine is described by the enum
  * vfio_device_mig_state. Some of the FSM arcs will create a migration data
  * transfer session by returning a FD, in this case the migration data will
  * flow over the FD using read() and write() as discussed below.
  *
  * There are 5 states to support VFIO_MIGRATION_STOP_COPY:
  *  RUNNING - The device is running normally
  *  STOP - The device does not change the internal or external state
  *  STOP_COPY - The device internal state can be read out
  *  RESUMING - The device is stopped and is loading a new internal state
  *  ERROR - The device has failed and must be reset
  *
  * And optional states to support VFIO_MIGRATION_P2P:
  *  RUNNING_P2P - RUNNING, except the device cannot do peer to peer DMA
  * And VFIO_MIGRATION_PRE_COPY:
  *  PRE_COPY - The device is running normally but tracking internal state
  *             changes
  * And VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY:
  *  PRE_COPY_P2P - PRE_COPY, except the device cannot do peer to peer DMA
  *
  * The FSM takes actions on the arcs between FSM states. The driver implements
  * the following behavior for the FSM arcs:
  *
  * RUNNING_P2P -> STOP
  * STOP_COPY -> STOP
  *   While in STOP the device must stop the operation of the device. The device
  *   must not generate interrupts, DMA, or any other change to external state.
  *   It must not change its internal state. When stopped the device and kernel
  *   migration driver must accept and respond to interaction to support external
  *   subsystems in the STOP state, for example PCI MSI-X and PCI config space.
  *   Failure by the user to restrict device access while in STOP must not result
  *   in error conditions outside the user context (ex. host system faults).
  *
  *   The STOP_COPY arc will terminate a data transfer session.
  *
  * RESUMING -> STOP
  *   Leaving RESUMING terminates a data transfer session and indicates the
  *   device should complete processing of the data delivered by write(). The
  *   kernel migration driver should complete the incorporation of data written
  *   to the data transfer FD into the device internal state and perform
  *   final validity and consistency checking of the new device state. If the
  *   user provided data is found to be incomplete, inconsistent, or otherwise
  *   invalid, the migration driver must fail the SET_STATE ioctl and
  *   optionally go to the ERROR state as described below.
  *
  *   While in STOP the device has the same behavior as other STOP states
  *   described above.
  *
  *   To abort a RESUMING session the device must be reset.
  *
  * PRE_COPY -> RUNNING
  * RUNNING_P2P -> RUNNING
  *   While in RUNNING the device is fully operational, the device may generate
  *   interrupts, DMA, respond to MMIO, all vfio device regions are functional,
  *   and the device may advance its internal state.
  *
  *   The PRE_COPY arc will terminate a data transfer session.
  *
  * PRE_COPY_P2P -> RUNNING_P2P
  * RUNNING -> RUNNING_P2P
  * STOP -> RUNNING_P2P
  *   While in RUNNING_P2P the device is partially running in the P2P quiescent
  *   state defined below.
  *
  *   The PRE_COPY_P2P arc will terminate a data transfer session.
  *
  * RUNNING -> PRE_COPY
  * RUNNING_P2P -> PRE_COPY_P2P
  * STOP -> STOP_COPY
  *   PRE_COPY, PRE_COPY_P2P and STOP_COPY form the "saving group" of states
  *   which share a data transfer session. Moving between these states alters
  *   what is streamed in session, but does not terminate or otherwise affect
  *   the associated fd.
  *
  *   These arcs begin the process of saving the device state and will return a
  *   new data_fd. The migration driver may perform actions such as enabling
  *   dirty logging of device state when entering PRE_COPY or PER_COPY_P2P.
  *
  *   Each arc does not change the device operation, the device remains
  *   RUNNING, P2P quiesced or in STOP. The STOP_COPY state is described below
  *   in PRE_COPY_P2P -> STOP_COPY.
  *
  * PRE_COPY -> PRE_COPY_P2P
  *   Entering PRE_COPY_P2P continues all the behaviors of PRE_COPY above.
  *   However, while in the PRE_COPY_P2P state, the device is partially running
  *   in the P2P quiescent state defined below, like RUNNING_P2P.
  *
  * PRE_COPY_P2P -> PRE_COPY
  *   This arc allows returning the device to a full RUNNING behavior while
  *   continuing all the behaviors of PRE_COPY.
  *
  * PRE_COPY_P2P -> STOP_COPY
  *   While in the STOP_COPY state the device has the same behavior as STOP
  *   with the addition that the data transfers session continues to stream the
  *   migration state. End of stream on the FD indicates the entire device
  *   state has been transferred.
  *
  *   The user should take steps to restrict access to vfio device regions while
  *   the device is in STOP_COPY or risk corruption of the device migration data
  *   stream.
  *
  * STOP -> RESUMING
  *   Entering the RESUMING state starts a process of restoring the device state
  *   and will return a new data_fd. The data stream fed into the data_fd should
  *   be taken from the data transfer output of a single FD during saving from
  *   a compatible device. The migration driver may alter/reset the internal
  *   device state for this arc if required to prepare the device to receive the
  *   migration data.
  *
  * STOP_COPY -> PRE_COPY
  * STOP_COPY -> PRE_COPY_P2P
  *   These arcs are not permitted and return error if requested. Future
  *   revisions of this API may define behaviors for these arcs, in this case
  *   support will be discoverable by a new flag in
  *   VFIO_DEVICE_FEATURE_MIGRATION.
  *
  * any -> ERROR
  *   ERROR cannot be specified as a device state, however any transition request
  *   can be failed with an errno return and may then move the device_state into
  *   ERROR. In this case the device was unable to execute the requested arc and
  *   was also unable to restore the device to any valid device_state.
  *   To recover from ERROR VFIO_DEVICE_RESET must be used to return the
  *   device_state back to RUNNING.
  *
  * The optional peer to peer (P2P) quiescent state is intended to be a quiescent
  * state for the device for the purposes of managing multiple devices within a
  * user context where peer-to-peer DMA between devices may be active. The
  * RUNNING_P2P and PRE_COPY_P2P states must prevent the device from initiating
  * any new P2P DMA transactions. If the device can identify P2P transactions
  * then it can stop only P2P DMA, otherwise it must stop all DMA. The migration
  * driver must complete any such outstanding operations prior to completing the
  * FSM arc into a P2P state. For the purpose of specification the states
  * behave as though the device was fully running if not supported. Like while in
  * STOP or STOP_COPY the user must not touch the device, otherwise the state
  * can be exited.
  *
  * The remaining possible transitions are interpreted as combinations of the
  * above FSM arcs. As there are multiple paths through the FSM arcs the path
  * should be selected based on the following rules:
  *   - Select the shortest path.
  *   - The path cannot have saving group states as interior arcs, only
  *     starting/end states.
  * Refer to vfio_mig_get_next_state() for the result of the algorithm.
  *
  * The automatic transit through the FSM arcs that make up the combination
  * transition is invisible to the user. When working with combination arcs the
  * user may see any step along the path in the device_state if SET_STATE
  * fails. When handling these types of errors users should anticipate future
  * revisions of this protocol using new states and those states becoming
  * visible in this case.
  *
  * The optional states cannot be used with SET_STATE if the device does not
  * support them. The user can discover if these states are supported by using
  * VFIO_DEVICE_FEATURE_MIGRATION. By using combination transitions the user can
  * avoid knowing about these optional states if the kernel driver supports them.
  *
  * Arcs touching PRE_COPY and PRE_COPY_P2P are removed if support for PRE_COPY
  * is not present.
  */
 enum vfio_device_mig_state {
 	VFIO_DEVICE_STATE_ERROR = 0,
 	VFIO_DEVICE_STATE_STOP = 1,
 	VFIO_DEVICE_STATE_RUNNING = 2,
 	VFIO_DEVICE_STATE_STOP_COPY = 3,
 	VFIO_DEVICE_STATE_RESUMING = 4,
 	VFIO_DEVICE_STATE_RUNNING_P2P = 5,
 	VFIO_DEVICE_STATE_PRE_COPY = 6,
 	VFIO_DEVICE_STATE_PRE_COPY_P2P = 7,
 	VFIO_DEVICE_STATE_NR,
 };
 
 /**
  * VFIO_MIG_GET_PRECOPY_INFO - _IO(VFIO_TYPE, VFIO_BASE + 21)
  *
  * This ioctl is used on the migration data FD in the precopy phase of the
  * migration data transfer. It returns an estimate of the current data sizes
  * remaining to be transferred. It allows the user to judge when it is
  * appropriate to leave PRE_COPY for STOP_COPY.
  *
  * This ioctl is valid only in PRE_COPY states and kernel driver should
  * return -EINVAL from any other migration state.
  *
  * The vfio_precopy_info data structure returned by this ioctl provides
  * estimates of data available from the device during the PRE_COPY states.
  * This estimate is split into two categories, initial_bytes and
  * dirty_bytes.
  *
  * The initial_bytes field indicates the amount of initial precopy
  * data available from the device. This field should have a non-zero initial
  * value and decrease as migration data is read from the device.
  * It is recommended to leave PRE_COPY for STOP_COPY only after this field
  * reaches zero. Leaving PRE_COPY earlier might make things slower.
  *
  * The dirty_bytes field tracks device state changes relative to data
  * previously retrieved.  This field starts at zero and may increase as
  * the internal device state is modified or decrease as that modified
  * state is read from the device.
  *
  * Userspace may use the combination of these fields to estimate the
  * potential data size available during the PRE_COPY phases, as well as
  * trends relative to the rate the device is dirtying its internal
  * state, but these fields are not required to have any bearing relative
  * to the data size available during the STOP_COPY phase.
  *
  * Drivers have a lot of flexibility in when and what they transfer during the
  * PRE_COPY phase, and how they report this from VFIO_MIG_GET_PRECOPY_INFO.
  *
  * During pre-copy the migration data FD has a temporary "end of stream" that is
  * reached when both initial_bytes and dirty_byte are zero. For instance, this
  * may indicate that the device is idle and not currently dirtying any internal
  * state. When read() is done on this temporary end of stream the kernel driver
  * should return ENOMSG from read(). Userspace can wait for more data (which may
  * never come) by using poll.
  *
  * Once in STOP_COPY the migration data FD has a permanent end of stream
  * signaled in the usual way by read() always returning 0 and poll always
  * returning readable. ENOMSG may not be returned in STOP_COPY.
  * Support for this ioctl is mandatory if a driver claims to support
  * VFIO_MIGRATION_PRE_COPY.
  *
  * Return: 0 on success, -1 and errno set on failure.
  */
 struct vfio_precopy_info {
 	__u32 argsz;
 	__u32 flags;
 	__aligned_u64 initial_bytes;
 	__aligned_u64 dirty_bytes;
 };
 
 #define VFIO_MIG_GET_PRECOPY_INFO _IO(VFIO_TYPE, VFIO_BASE + 21)
 
 /*
  * Upon VFIO_DEVICE_FEATURE_SET, allow the device to be moved into a low power
  * state with the platform-based power management.  Device use of lower power
  * states depends on factors managed by the runtime power management core,
  * including system level support and coordinating support among dependent
  * devices.  Enabling device low power entry does not guarantee lower power
  * usage by the device, nor is a mechanism provided through this feature to
  * know the current power state of the device.  If any device access happens
  * (either from the host or through the vfio uAPI) when the device is in the
  * low power state, then the host will move the device out of the low power
  * state as necessary prior to the access.  Once the access is completed, the
  * device may re-enter the low power state.  For single shot low power support
  * with wake-up notification, see
  * VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP below.  Access to mmap'd
  * device regions is disabled on LOW_POWER_ENTRY and may only be resumed after
  * calling LOW_POWER_EXIT.
  */
 #define VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY 3
 
 /*
  * This device feature has the same behavior as
  * VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY with the exception that the user
  * provides an eventfd for wake-up notification.  When the device moves out of
  * the low power state for the wake-up, the host will not allow the device to
  * re-enter a low power state without a subsequent user call to one of the low
  * power entry device feature IOCTLs.  Access to mmap'd device regions is
  * disabled on LOW_POWER_ENTRY_WITH_WAKEUP and may only be resumed after the
  * low power exit.  The low power exit can happen either through LOW_POWER_EXIT
  * or through any other access (where the wake-up notification has been
  * generated).  The access to mmap'd device regions will not trigger low power
  * exit.
  *
  * The notification through the provided eventfd will be generated only when
  * the device has entered and is resumed from a low power state after
  * calling this device feature IOCTL.  A device that has not entered low power
  * state, as managed through the runtime power management core, will not
  * generate a notification through the provided eventfd on access.  Calling the
  * LOW_POWER_EXIT feature is optional in the case where notification has been
  * signaled on the provided eventfd that a resume from low power has occurred.
  */
 struct vfio_device_low_power_entry_with_wakeup {
 	__s32 wakeup_eventfd;
 	__u32 reserved;
 };
 
 #define VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP 4
 
 /*
  * Upon VFIO_DEVICE_FEATURE_SET, disallow use of device low power states as
  * previously enabled via VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY or
  * VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP device features.
  * This device feature IOCTL may itself generate a wakeup eventfd notification
  * in the latter case if the device had previously entered a low power state.
  */
 #define VFIO_DEVICE_FEATURE_LOW_POWER_EXIT 5
 
 /*
  * Upon VFIO_DEVICE_FEATURE_SET start/stop device DMA logging.
  * VFIO_DEVICE_FEATURE_PROBE can be used to detect if the device supports
  * DMA logging.
  *
  * DMA logging allows a device to internally record what DMAs the device is
  * initiating and report them back to userspace. It is part of the VFIO
  * migration infrastructure that allows implementing dirty page tracking
  * during the pre copy phase of live migration. Only DMA WRITEs are logged,
  * and this API is not connected to VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE.
  *
  * When DMA logging is started a range of IOVAs to monitor is provided and the
  * device can optimize its logging to cover only the IOVA range given. Each
  * DMA that the device initiates inside the range will be logged by the device
  * for later retrieval.
  *
  * page_size is an input that hints what tracking granularity the device
  * should try to achieve. If the device cannot do the hinted page size then
  * it's the driver choice which page size to pick based on its support.
  * On output the device will return the page size it selected.
  *
  * ranges is a pointer to an array of
  * struct vfio_device_feature_dma_logging_range.
  *
  * The core kernel code guarantees to support by minimum num_ranges that fit
  * into a single kernel page. User space can try higher values but should give
  * up if the above can't be achieved as of some driver limitations.
  *
  * A single call to start device DMA logging can be issued and a matching stop
  * should follow at the end. Another start is not allowed in the meantime.
  */
 struct vfio_device_feature_dma_logging_control {
 	__aligned_u64 page_size;
 	__u32 num_ranges;
 	__u32 __reserved;
 	__aligned_u64 ranges;
 };
 
 struct vfio_device_feature_dma_logging_range {
 	__aligned_u64 iova;
 	__aligned_u64 length;
 };
 
 #define VFIO_DEVICE_FEATURE_DMA_LOGGING_START 6
 
 /*
  * Upon VFIO_DEVICE_FEATURE_SET stop device DMA logging that was started
  * by VFIO_DEVICE_FEATURE_DMA_LOGGING_START
  */
 #define VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP 7
 
 /*
  * Upon VFIO_DEVICE_FEATURE_GET read back and clear the device DMA log
  *
  * Query the device's DMA log for written pages within the given IOVA range.
  * During querying the log is cleared for the IOVA range.
  *
  * bitmap is a pointer to an array of u64s that will hold the output bitmap
  * with 1 bit reporting a page_size unit of IOVA. The mapping of IOVA to bits
  * is given by:
  *  bitmap[(addr - iova)/page_size] & (1ULL << (addr % 64))
  *
  * The input page_size can be any power of two value and does not have to
  * match the value given to VFIO_DEVICE_FEATURE_DMA_LOGGING_START. The driver
  * will format its internal logging to match the reporting page size, possibly
  * by replicating bits if the internal page size is lower than requested.
  *
  * The LOGGING_REPORT will only set bits in the bitmap and never clear or
  * perform any initialization of the user provided bitmap.
  *
  * If any error is returned userspace should assume that the dirty log is
  * corrupted. Error recovery is to consider all memory dirty and try to
  * restart the dirty tracking, or to abort/restart the whole migration.
  *
  * If DMA logging is not enabled, an error will be returned.
  *
  */
 struct vfio_device_feature_dma_logging_report {
 	__aligned_u64 iova;
 	__aligned_u64 length;
 	__aligned_u64 page_size;
 	__aligned_u64 bitmap;
 };
 
 #define VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT 8
 
 /*
  * Upon VFIO_DEVICE_FEATURE_GET read back the estimated data length that will
  * be required to complete stop copy.
  *
  * Note: Can be called on each device state.
  */
 
 struct vfio_device_feature_mig_data_size {
 	__aligned_u64 stop_copy_length;
 };
 
 #define VFIO_DEVICE_FEATURE_MIG_DATA_SIZE 9
 
 /**
  * Upon VFIO_DEVICE_FEATURE_SET, set or clear the BUS mastering for the device
  * based on the operation specified in op flag.
  *
  * The functionality is incorporated for devices that needs bus master control,
  * but the in-band device interface lacks the support. Consequently, it is not
  * applicable to PCI devices, as bus master control for PCI devices is managed
  * in-band through the configuration space. At present, this feature is supported
  * only for CDX devices.
  * When the device's BUS MASTER setting is configured as CLEAR, it will result in
  * blocking all incoming DMA requests from the device. On the other hand, configuring
  * the device's BUS MASTER setting as SET (enable) will grant the device the
  * capability to perform DMA to the host memory.
  */
 struct vfio_device_feature_bus_master {
 	__u32 op;
 #define		VFIO_DEVICE_FEATURE_CLEAR_MASTER	0	/* Clear Bus Master */
 #define		VFIO_DEVICE_FEATURE_SET_MASTER		1	/* Set Bus Master */
 };
 #define VFIO_DEVICE_FEATURE_BUS_MASTER 10
 
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
  * VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct vfio_iommu_info)
  *
  * Retrieve information about the IOMMU object. Fills in provided
  * struct vfio_iommu_info. Caller sets argsz.
  *
  * XXX Should we do these by CHECK_EXTENSION too?
  */
 struct vfio_iommu_type1_info {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_IOMMU_INFO_PGSIZES (1 << 0)	/* supported page sizes info */
 #define VFIO_IOMMU_INFO_CAPS	(1 << 1)	/* Info supports caps */
 	__aligned_u64	iova_pgsizes;		/* Bitmap of supported page sizes */
 	__u32   cap_offset;	/* Offset within info struct of first cap */
 	__u32   pad;
 };
 
 /*
  * The IOVA capability allows to report the valid IOVA range(s)
  * excluding any non-relaxable reserved regions exposed by
  * devices attached to the container. Any DMA map attempt
  * outside the valid iova range will return error.
  *
  * The structures below define version 1 of this capability.
  */
 #define VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE  1
 
 struct vfio_iova_range {
 	__u64	start;
 	__u64	end;
 };
 
 struct vfio_iommu_type1_info_cap_iova_range {
 	struct	vfio_info_cap_header header;
 	__u32	nr_iovas;
 	__u32	reserved;
 	struct	vfio_iova_range iova_ranges[];
 };
 
 /*
  * The migration capability allows to report supported features for migration.
  *
  * The structures below define version 1 of this capability.
  *
  * The existence of this capability indicates that IOMMU kernel driver supports
  * dirty page logging.
  *
  * pgsize_bitmap: Kernel driver returns bitmap of supported page sizes for dirty
  * page logging.
  * max_dirty_bitmap_size: Kernel driver returns maximum supported dirty bitmap
  * size in bytes that can be used by user applications when getting the dirty
  * bitmap.
  */
 #define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION  2
 
 struct vfio_iommu_type1_info_cap_migration {
 	struct	vfio_info_cap_header header;
 	__u32	flags;
 	__u64	pgsize_bitmap;
 	__u64	max_dirty_bitmap_size;		/* in bytes */
 };
 
 /*
  * The DMA available capability allows to report the current number of
  * simultaneously outstanding DMA mappings that are allowed.
  *
  * The structure below defines version 1 of this capability.
  *
  * avail: specifies the current number of outstanding DMA mappings allowed.
  */
 #define VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL 3
 
 struct vfio_iommu_type1_info_dma_avail {
 	struct	vfio_info_cap_header header;
 	__u32	avail;
 };
 
 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
 
 /**
  * VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map)
  *
  * Map process virtual addresses to IO virtual addresses using the
  * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required.
  *
  * If flags & VFIO_DMA_MAP_FLAG_VADDR, update the base vaddr for iova. The vaddr
  * must have previously been invalidated with VFIO_DMA_UNMAP_FLAG_VADDR.  To
  * maintain memory consistency within the user application, the updated vaddr
  * must address the same memory object as originally mapped.  Failure to do so
  * will result in user memory corruption and/or device misbehavior.  iova and
  * size must match those in the original MAP_DMA call.  Protection is not
  * changed, and the READ & WRITE flags must be 0.
  */
 struct vfio_iommu_type1_dma_map {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_DMA_MAP_FLAG_READ (1 << 0)		/* readable from device */
 #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1)	/* writable from device */
 #define VFIO_DMA_MAP_FLAG_VADDR (1 << 2)
 	__u64	vaddr;				/* Process virtual address */
 	__u64	iova;				/* IO virtual address */
 	__u64	size;				/* Size of mapping (bytes) */
 };
 
 #define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13)
 
 struct vfio_bitmap {
 	__u64        pgsize;	/* page size for bitmap in bytes */
 	__u64        size;	/* in bytes */
 	__u64 *data;	/* one bit per page */
 };
 
 /**
  * VFIO_IOMMU_UNMAP_DMA - _IOWR(VFIO_TYPE, VFIO_BASE + 14,
  *							struct vfio_dma_unmap)
  *
  * Unmap IO virtual addresses using the provided struct vfio_dma_unmap.
  * Caller sets argsz.  The actual unmapped size is returned in the size
  * field.  No guarantee is made to the user that arbitrary unmaps of iova
  * or size different from those used in the original mapping call will
  * succeed.
  *
  * VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP should be set to get the dirty bitmap
  * before unmapping IO virtual addresses. When this flag is set, the user must
  * provide a struct vfio_bitmap in data[]. User must provide zero-allocated
  * memory via vfio_bitmap.data and its size in the vfio_bitmap.size field.
  * A bit in the bitmap represents one page, of user provided page size in
  * vfio_bitmap.pgsize field, consecutively starting from iova offset. Bit set
  * indicates that the page at that offset from iova is dirty. A Bitmap of the
  * pages in the range of unmapped size is returned in the user-provided
  * vfio_bitmap.data.
  *
  * If flags & VFIO_DMA_UNMAP_FLAG_ALL, unmap all addresses.  iova and size
  * must be 0.  This cannot be combined with the get-dirty-bitmap flag.
  *
  * If flags & VFIO_DMA_UNMAP_FLAG_VADDR, do not unmap, but invalidate host
  * virtual addresses in the iova range.  DMA to already-mapped pages continues.
  * Groups may not be added to the container while any addresses are invalid.
  * This cannot be combined with the get-dirty-bitmap flag.
  */
 struct vfio_iommu_type1_dma_unmap {
 	__u32	argsz;
 	__u32	flags;
 #define VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (1 << 0)
 #define VFIO_DMA_UNMAP_FLAG_ALL		     (1 << 1)
 #define VFIO_DMA_UNMAP_FLAG_VADDR	     (1 << 2)
 	__u64	iova;				/* IO virtual address */
 	__u64	size;				/* Size of mapping (bytes) */
 	__u8    data[];
 };
 
 #define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14)
 
 /*
  * IOCTLs to enable/disable IOMMU container usage.
  * No parameters are supported.
  */
 #define VFIO_IOMMU_ENABLE	_IO(VFIO_TYPE, VFIO_BASE + 15)
 #define VFIO_IOMMU_DISABLE	_IO(VFIO_TYPE, VFIO_BASE + 16)
 
 /**
  * VFIO_IOMMU_DIRTY_PAGES - _IOWR(VFIO_TYPE, VFIO_BASE + 17,
  *                                     struct vfio_iommu_type1_dirty_bitmap)
  * IOCTL is used for dirty pages logging.
  * Caller should set flag depending on which operation to perform, details as
  * below:
  *
  * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_START flag set, instructs
  * the IOMMU driver to log pages that are dirtied or potentially dirtied by
  * the device; designed to be used when a migration is in progress. Dirty pages
  * are logged until logging is disabled by user application by calling the IOCTL
  * with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag.
  *
  * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag set, instructs
  * the IOMMU driver to stop logging dirtied pages.
  *
  * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP flag set
  * returns the dirty pages bitmap for IOMMU container for a given IOVA range.
  * The user must specify the IOVA range and the pgsize through the structure
  * vfio_iommu_type1_dirty_bitmap_get in the data[] portion. This interface
  * supports getting a bitmap of the smallest supported pgsize only and can be
  * modified in future to get a bitmap of any specified supported pgsize. The
  * user must provide a zeroed memory area for the bitmap memory and specify its
  * size in bitmap.size. One bit is used to represent one page consecutively
  * starting from iova offset. The user should provide page size in bitmap.pgsize
  * field. A bit set in the bitmap indicates that the page at that offset from
  * iova is dirty. The caller must set argsz to a value including the size of
  * structure vfio_iommu_type1_dirty_bitmap_get, but excluding the size of the
  * actual bitmap. If dirty pages logging is not enabled, an error will be
  * returned.
  *
  * Only one of the flags _START, _STOP and _GET may be specified at a time.
  *
  */
 struct vfio_iommu_type1_dirty_bitmap {
 	__u32        argsz;
 	__u32        flags;
 #define VFIO_IOMMU_DIRTY_PAGES_FLAG_START	(1 << 0)
 #define VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP	(1 << 1)
 #define VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP	(1 << 2)
 	__u8         data[];
 };
 
 struct vfio_iommu_type1_dirty_bitmap_get {
 	__u64              iova;	/* IO virtual address */
 	__u64              size;	/* Size of iova range */
 	struct vfio_bitmap bitmap;
 };
 
 #define VFIO_IOMMU_DIRTY_PAGES             _IO(VFIO_TYPE, VFIO_BASE + 17)
 
 /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
 
 /*
  * The SPAPR TCE DDW info struct provides the information about
  * the details of Dynamic DMA window capability.
  *
  * @pgsizes contains a page size bitmask, 4K/64K/16M are supported.
  * @max_dynamic_windows_supported tells the maximum number of windows
  * which the platform can create.
  * @levels tells the maximum number of levels in multi-level IOMMU tables;
  * this allows splitting a table into smaller chunks which reduces
  * the amount of physically contiguous memory required for the table.
  */
 struct vfio_iommu_spapr_tce_ddw_info {
 	__u64 pgsizes;			/* Bitmap of supported page sizes */
 	__u32 max_dynamic_windows_supported;
 	__u32 levels;
 };
 
 /*
  * The SPAPR TCE info struct provides the information about the PCI bus
  * address ranges available for DMA, these values are programmed into
  * the hardware so the guest has to know that information.
  *
  * The DMA 32 bit window start is an absolute PCI bus address.
  * The IOVA address passed via map/unmap ioctls are absolute PCI bus
  * addresses too so the window works as a filter rather than an offset
  * for IOVA addresses.
  *
  * Flags supported:
  * - VFIO_IOMMU_SPAPR_INFO_DDW: informs the userspace that dynamic DMA windows
  *   (DDW) support is present. @ddw is only supported when DDW is present.
  */
 struct vfio_iommu_spapr_tce_info {
 	__u32 argsz;
 	__u32 flags;
 #define VFIO_IOMMU_SPAPR_INFO_DDW	(1 << 0)	/* DDW supported */
 	__u32 dma32_window_start;	/* 32 bit window start (bytes) */
 	__u32 dma32_window_size;	/* 32 bit window size (bytes) */
 	struct vfio_iommu_spapr_tce_ddw_info ddw;
 };
 
 #define VFIO_IOMMU_SPAPR_TCE_GET_INFO	_IO(VFIO_TYPE, VFIO_BASE + 12)
 
 /*
  * EEH PE operation struct provides ways to:
  * - enable/disable EEH functionality;
  * - unfreeze IO/DMA for frozen PE;
  * - read PE state;
  * - reset PE;
  * - configure PE;
  * - inject EEH error.
  */
 struct vfio_eeh_pe_err {
 	__u32 type;
 	__u32 func;
 	__u64 addr;
 	__u64 mask;
 };
 
 struct vfio_eeh_pe_op {
 	__u32 argsz;
 	__u32 flags;
 	__u32 op;
 	union {
 		struct vfio_eeh_pe_err err;
 	};
 };
 
 #define VFIO_EEH_PE_DISABLE		0	/* Disable EEH functionality */
 #define VFIO_EEH_PE_ENABLE		1	/* Enable EEH functionality  */
 #define VFIO_EEH_PE_UNFREEZE_IO		2	/* Enable IO for frozen PE   */
 #define VFIO_EEH_PE_UNFREEZE_DMA	3	/* Enable DMA for frozen PE  */
 #define VFIO_EEH_PE_GET_STATE		4	/* PE state retrieval        */
 #define  VFIO_EEH_PE_STATE_NORMAL	0	/* PE in functional state    */
 #define  VFIO_EEH_PE_STATE_RESET	1	/* PE reset in progress      */
 #define  VFIO_EEH_PE_STATE_STOPPED	2	/* Stopped DMA and IO        */
 #define  VFIO_EEH_PE_STATE_STOPPED_DMA	4	/* Stopped DMA only          */
 #define  VFIO_EEH_PE_STATE_UNAVAIL	5	/* State unavailable         */
 #define VFIO_EEH_PE_RESET_DEACTIVATE	5	/* Deassert PE reset         */
 #define VFIO_EEH_PE_RESET_HOT		6	/* Assert hot reset          */
 #define VFIO_EEH_PE_RESET_FUNDAMENTAL	7	/* Assert fundamental reset  */
 #define VFIO_EEH_PE_CONFIGURE		8	/* PE configuration          */
 #define VFIO_EEH_PE_INJECT_ERR		9	/* Inject EEH error          */
 
 #define VFIO_EEH_PE_OP			_IO(VFIO_TYPE, VFIO_BASE + 21)
 
 /**
  * VFIO_IOMMU_SPAPR_REGISTER_MEMORY - _IOW(VFIO_TYPE, VFIO_BASE + 17, struct vfio_iommu_spapr_register_memory)
  *
  * Registers user space memory where DMA is allowed. It pins
  * user pages and does the locked memory accounting so
  * subsequent VFIO_IOMMU_MAP_DMA/VFIO_IOMMU_UNMAP_DMA calls
  * get faster.
  */
 struct vfio_iommu_spapr_register_memory {
 	__u32	argsz;
 	__u32	flags;
 	__u64	vaddr;				/* Process virtual address */
 	__u64	size;				/* Size of mapping (bytes) */
 };
 #define VFIO_IOMMU_SPAPR_REGISTER_MEMORY	_IO(VFIO_TYPE, VFIO_BASE + 17)
 
 /**
  * VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY - _IOW(VFIO_TYPE, VFIO_BASE + 18, struct vfio_iommu_spapr_register_memory)
  *
  * Unregisters user space memory registered with
  * VFIO_IOMMU_SPAPR_REGISTER_MEMORY.
  * Uses vfio_iommu_spapr_register_memory for parameters.
  */
 #define VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY	_IO(VFIO_TYPE, VFIO_BASE + 18)
 
 /**
  * VFIO_IOMMU_SPAPR_TCE_CREATE - _IOWR(VFIO_TYPE, VFIO_BASE + 19, struct vfio_iommu_spapr_tce_create)
  *
  * Creates an additional TCE table and programs it (sets a new DMA window)
  * to every IOMMU group in the container. It receives page shift, window
  * size and number of levels in the TCE table being created.
  *
  * It allocates and returns an offset on a PCI bus of the new DMA window.
  */
 struct vfio_iommu_spapr_tce_create {
 	__u32 argsz;
 	__u32 flags;
 	/* in */
 	__u32 page_shift;
 	__u32 __resv1;
 	__u64 window_size;
 	__u32 levels;
 	__u32 __resv2;
 	/* out */
 	__u64 start_addr;
 };
 #define VFIO_IOMMU_SPAPR_TCE_CREATE	_IO(VFIO_TYPE, VFIO_BASE + 19)
 
 /**
  * VFIO_IOMMU_SPAPR_TCE_REMOVE - _IOW(VFIO_TYPE, VFIO_BASE + 20, struct vfio_iommu_spapr_tce_remove)
  *
  * Unprograms a TCE table from all groups in the container and destroys it.
  * It receives a PCI bus offset as a window id.
  */
 struct vfio_iommu_spapr_tce_remove {
 	__u32 argsz;
 	__u32 flags;
 	/* in */
 	__u64 start_addr;
 };
 #define VFIO_IOMMU_SPAPR_TCE_REMOVE	_IO(VFIO_TYPE, VFIO_BASE + 20)
 
 /* ***************************************************************** */
 
 #endif /* VFIO_H */