Hi Yi,
On 3/22/20 1:35 PM, Liu Yi L wrote:
> The kernel uapi/linux/iommu.h header file includes the
> extensions for vSVA support. e.g. bind gpasid, iommu
> fault report related user structures and etc.
>
> Note: this should be replaced with a full header files update when
> the vSVA uPAPI is stable.
Until this gets upstreamed, maybe add the branch against which you
updated the headers?
Thanks
Eric
>
> Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
> Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> Cc: Peter Xu <peterx@xxxxxxxxxx>
> Cc: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Cc: Cornelia Huck <cohuck@xxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx>
> ---
> linux-headers/linux/iommu.h | 378 ++++++++++++++++++++++++++++++++++++++++++++
> linux-headers/linux/vfio.h | 127 +++++++++++++++
> 2 files changed, 505 insertions(+)
> create mode 100644 linux-headers/linux/iommu.h
>
> diff --git a/linux-headers/linux/iommu.h b/linux-headers/linux/iommu.h
> new file mode 100644
> index 0000000..9025496
> --- /dev/null
> +++ b/linux-headers/linux/iommu.h
> @@ -0,0 +1,378 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * IOMMU user API definitions
> + */
> +
> +#ifndef _IOMMU_H
> +#define _IOMMU_H
> +
> +#include <linux/types.h>
> +
> +/**
> + * Current version of the IOMMU user API. This is intended for query
> + * between user and kernel to determine compatible data structures.
> + *
> + * UAPI version can be bumped up with the following rules:
> + * 1. All data structures passed between user and kernel space share
> + * the same version number. i.e. any extension to any structure
> + * results in version number increment.
> + *
> + * 2. Data structures are open to extension but closed to modification.
> + * Extension should leverage the padding bytes first where a new
> + * flag bit is required to indicate the validity of each new member.
> + * The above rule for padding bytes also applies to adding new union
> + * members.
> + * After padding bytes are exhausted, new fields must be added at the
> + * end of each data structure with 64bit alignment. Flag bits can be
> + * added without size change but existing ones cannot be altered.
> + *
> + * 3. Versions are backward compatible.
> + *
> + * 4. Version to size lookup is supported by kernel internal API for each
> + * API function type. @version is mandatory for new data structures
> + * and must be at the beginning with type of __u32.
> + */
> +#define IOMMU_UAPI_VERSION 1
> +static __inline__ int iommu_get_uapi_version(void)
> +{
> + return IOMMU_UAPI_VERSION;
> +}
> +
> +/*
> + * Supported UAPI features that can be reported to user space.
> + * These types represent the capability available in the kernel.
> + *
> + * REVISIT: UAPI version also implies the capabilities. Should we
> + * report them explicitly?
> + */
> +enum IOMMU_UAPI_DATA_TYPES {
> + IOMMU_UAPI_BIND_GPASID,
> + IOMMU_UAPI_CACHE_INVAL,
> + IOMMU_UAPI_PAGE_RESP,
> + NR_IOMMU_UAPI_TYPE,
> +};
> +
> +#define IOMMU_UAPI_CAP_MASK ((1 << IOMMU_UAPI_BIND_GPASID) | \
> + (1 << IOMMU_UAPI_CACHE_INVAL) | \
> + (1 << IOMMU_UAPI_PAGE_RESP))
> +
> +#define IOMMU_FAULT_PERM_READ (1 << 0) /* read */
> +#define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */
> +#define IOMMU_FAULT_PERM_EXEC (1 << 2) /* exec */
> +#define IOMMU_FAULT_PERM_PRIV (1 << 3) /* privileged */
> +
> +/* Generic fault types, can be expanded IRQ remapping fault */
> +enum iommu_fault_type {
> + IOMMU_FAULT_DMA_UNRECOV = 1, /* unrecoverable fault */
> + IOMMU_FAULT_PAGE_REQ, /* page request fault */
> +};
> +
> +enum iommu_fault_reason {
> + IOMMU_FAULT_REASON_UNKNOWN = 0,
> +
> + /* Could not access the PASID table (fetch caused external abort) */
> + IOMMU_FAULT_REASON_PASID_FETCH,
> +
> + /* PASID entry is invalid or has configuration errors */
> + IOMMU_FAULT_REASON_BAD_PASID_ENTRY,
> +
> + /*
> + * PASID is out of range (e.g. exceeds the maximum PASID
> + * supported by the IOMMU) or disabled.
> + */
> + IOMMU_FAULT_REASON_PASID_INVALID,
> +
> + /*
> + * An external abort occurred fetching (or updating) a translation
> + * table descriptor
> + */
> + IOMMU_FAULT_REASON_WALK_EABT,
> +
> + /*
> + * Could not access the page table entry (Bad address),
> + * actual translation fault
> + */
> + IOMMU_FAULT_REASON_PTE_FETCH,
> +
> + /* Protection flag check failed */
> + IOMMU_FAULT_REASON_PERMISSION,
> +
> + /* access flag check failed */
> + IOMMU_FAULT_REASON_ACCESS,
> +
> + /* Output address of a translation stage caused Address Size fault */
> + IOMMU_FAULT_REASON_OOR_ADDRESS,
> +};
> +
> +/**
> + * struct iommu_fault_unrecoverable - Unrecoverable fault data
> + * @reason: reason of the fault, from &enum iommu_fault_reason
> + * @flags: parameters of this fault (IOMMU_FAULT_UNRECOV_* values)
> + * @pasid: Process Address Space ID
> + * @perm: requested permission access using by the incoming transaction
> + * (IOMMU_FAULT_PERM_* values)
> + * @addr: offending page address
> + * @fetch_addr: address that caused a fetch abort, if any
> + */
> +struct iommu_fault_unrecoverable {
> + __u32 reason;
> +#define IOMMU_FAULT_UNRECOV_PASID_VALID (1 << 0)
> +#define IOMMU_FAULT_UNRECOV_ADDR_VALID (1 << 1)
> +#define IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID (1 << 2)
> + __u32 flags;
> + __u32 pasid;
> + __u32 perm;
> + __u64 addr;
> + __u64 fetch_addr;
> +};
> +
> +/**
> + * struct iommu_fault_page_request - Page Request data
> + * @flags: encodes whether the corresponding fields are valid and whether this
> + * is the last page in group (IOMMU_FAULT_PAGE_REQUEST_* values)
> + * @pasid: Process Address Space ID
> + * @grpid: Page Request Group Index
> + * @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
> + * @addr: page address
> + * @private_data: device-specific private information
> + */
> +struct iommu_fault_page_request {
> +#define IOMMU_FAULT_PAGE_REQUEST_PASID_VALID (1 << 0)
> +#define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE (1 << 1)
> +#define IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA (1 << 2)
> + __u32 flags;
> + __u32 pasid;
> + __u32 grpid;
> + __u32 perm;
> + __u64 addr;
> + __u64 private_data[2];
> +};
> +
> +/**
> + * struct iommu_fault - Generic fault data
> + * @type: fault type from &enum iommu_fault_type
> + * @padding: reserved for future use (should be zero)
> + * @event: fault event, when @type is %IOMMU_FAULT_DMA_UNRECOV
> + * @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
> + * @padding2: sets the fault size to allow for future extensions
> + */
> +struct iommu_fault {
> + __u32 type;
> + __u32 padding;
> + union {
> + struct iommu_fault_unrecoverable event;
> + struct iommu_fault_page_request prm;
> + __u8 padding2[56];
> + };
> +};
> +
> +/**
> + * enum iommu_page_response_code - Return status of fault handlers
> + * @IOMMU_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
> + * populated, retry the access. This is "Success" in PCI PRI.
> + * @IOMMU_PAGE_RESP_FAILURE: General error. Drop all subsequent faults from
> + * this device if possible. This is "Response Failure" in PCI PRI.
> + * @IOMMU_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
> + * access. This is "Invalid Request" in PCI PRI.
> + */
> +enum iommu_page_response_code {
> + IOMMU_PAGE_RESP_SUCCESS = 0,
> + IOMMU_PAGE_RESP_INVALID,
> + IOMMU_PAGE_RESP_FAILURE,
> +};
> +
> +/**
> + * struct iommu_page_response - Generic page response information
> + * @version: IOMMU_UAPI_VERSION
> + * @flags: encodes whether the corresponding fields are valid
> + * (IOMMU_FAULT_PAGE_RESPONSE_* values)
> + * @pasid: Process Address Space ID
> + * @grpid: Page Request Group Index
> + * @code: response code from &enum iommu_page_response_code
> + */
> +struct iommu_page_response {
> + __u32 version;
> +#define IOMMU_PAGE_RESP_PASID_VALID (1 << 0)
> + __u32 flags;
> + __u32 pasid;
> + __u32 grpid;
> + __u32 code;
> +};
> +
> +/* defines the granularity of the invalidation */
> +enum iommu_inv_granularity {
> + IOMMU_INV_GRANU_DOMAIN, /* domain-selective invalidation */
> + IOMMU_INV_GRANU_PASID, /* PASID-selective invalidation */
> + IOMMU_INV_GRANU_ADDR, /* page-selective invalidation */
> + IOMMU_INV_GRANU_NR, /* number of invalidation granularities */
> +};
> +
> +/**
> + * struct iommu_inv_addr_info - Address Selective Invalidation Structure
> + *
> + * @flags: indicates the granularity of the address-selective invalidation
> + * - If the PASID bit is set, the @pasid field is populated and the invalidation
> + * relates to cache entries tagged with this PASID and matching the address
> + * range.
> + * - If ARCHID bit is set, @archid is populated and the invalidation relates
> + * to cache entries tagged with this architecture specific ID and matching
> + * the address range.
> + * - Both PASID and ARCHID can be set as they may tag different caches.
> + * - If neither PASID or ARCHID is set, global addr invalidation applies.
> + * - The LEAF flag indicates whether only the leaf PTE caching needs to be
> + * invalidated and other paging structure caches can be preserved.
> + * @pasid: process address space ID
> + * @archid: architecture-specific ID
> + * @addr: first stage/level input address
> + * @granule_size: page/block size of the mapping in bytes
> + * @nb_granules: number of contiguous granules to be invalidated
> + */
> +struct iommu_inv_addr_info {
> +#define IOMMU_INV_ADDR_FLAGS_PASID (1 << 0)
> +#define IOMMU_INV_ADDR_FLAGS_ARCHID (1 << 1)
> +#define IOMMU_INV_ADDR_FLAGS_LEAF (1 << 2)
> + __u32 flags;
> + __u32 archid;
> + __u64 pasid;
> + __u64 addr;
> + __u64 granule_size;
> + __u64 nb_granules;
> +};
> +
> +/**
> + * struct iommu_inv_pasid_info - PASID Selective Invalidation Structure
> + *
> + * @flags: indicates the granularity of the PASID-selective invalidation
> + * - If the PASID bit is set, the @pasid field is populated and the invalidation
> + * relates to cache entries tagged with this PASID and matching the address
> + * range.
> + * - If the ARCHID bit is set, the @archid is populated and the invalidation
> + * relates to cache entries tagged with this architecture specific ID and
> + * matching the address range.
> + * - Both PASID and ARCHID can be set as they may tag different caches.
> + * - At least one of PASID or ARCHID must be set.
> + * @pasid: process address space ID
> + * @archid: architecture-specific ID
> + */
> +struct iommu_inv_pasid_info {
> +#define IOMMU_INV_PASID_FLAGS_PASID (1 << 0)
> +#define IOMMU_INV_PASID_FLAGS_ARCHID (1 << 1)
> + __u32 flags;
> + __u32 archid;
> + __u64 pasid;
> +};
> +
> +/**
> + * struct iommu_cache_invalidate_info - First level/stage invalidation
> + * information
> + * @version: IOMMU_UAPI_VERSION
> + * @cache: bitfield that allows to select which caches to invalidate
> + * @granularity: defines the lowest granularity used for the invalidation:
> + * domain > PASID > addr
> + * @padding: reserved for future use (should be zero)
> + * @pasid_info: invalidation data when @granularity is %IOMMU_INV_GRANU_PASID
> + * @addr_info: invalidation data when @granularity is %IOMMU_INV_GRANU_ADDR
> + *
> + * Not all the combinations of cache/granularity are valid:
> + *
> + * +--------------+---------------+---------------+---------------+
> + * | type / | DEV_IOTLB | IOTLB | PASID |
> + * | granularity | | | cache |
> + * +==============+===============+===============+===============+
> + * | DOMAIN | N/A | Y | Y |
> + * +--------------+---------------+---------------+---------------+
> + * | PASID | Y | Y | Y |
> + * +--------------+---------------+---------------+---------------+
> + * | ADDR | Y | Y | N/A |
> + * +--------------+---------------+---------------+---------------+
> + *
> + * Invalidations by %IOMMU_INV_GRANU_DOMAIN don't take any argument other than
> + * @version and @cache.
> + *
> + * If multiple cache types are invalidated simultaneously, they all
> + * must support the used granularity.
> + */
> +struct iommu_cache_invalidate_info {
> + __u32 version;
> +/* IOMMU paging structure cache */
> +#define IOMMU_CACHE_INV_TYPE_IOTLB (1 << 0) /* IOMMU IOTLB */
> +#define IOMMU_CACHE_INV_TYPE_DEV_IOTLB (1 << 1) /* Device IOTLB */
> +#define IOMMU_CACHE_INV_TYPE_PASID (1 << 2) /* PASID cache */
> +#define IOMMU_CACHE_INV_TYPE_NR (3)
> + __u8 cache;
> + __u8 granularity;
> + __u8 padding[2];
> + union {
> + struct iommu_inv_pasid_info pasid_info;
> + struct iommu_inv_addr_info addr_info;
> + };
> +};
> +
> +/**
> + * struct iommu_gpasid_bind_data_vtd - Intel VT-d specific data on device and guest
> + * SVA binding.
> + *
> + * @flags: VT-d PASID table entry attributes
> + * @pat: Page attribute table data to compute effective memory type
> + * @emt: Extended memory type
> + *
> + * Only guest vIOMMU selectable and effective options are passed down to
> + * the host IOMMU.
> + */
> +struct iommu_gpasid_bind_data_vtd {
> +#define IOMMU_SVA_VTD_GPASID_SRE (1 << 0) /* supervisor request */
> +#define IOMMU_SVA_VTD_GPASID_EAFE (1 << 1) /* extended access enable */
> +#define IOMMU_SVA_VTD_GPASID_PCD (1 << 2) /* page-level cache disable */
> +#define IOMMU_SVA_VTD_GPASID_PWT (1 << 3) /* page-level write through */
> +#define IOMMU_SVA_VTD_GPASID_EMTE (1 << 4) /* extended mem type enable */
> +#define IOMMU_SVA_VTD_GPASID_CD (1 << 5) /* PASID-level cache disable */
> + __u64 flags;
> + __u32 pat;
> + __u32 emt;
> +};
> +#define IOMMU_SVA_VTD_GPASID_EMT_MASK (IOMMU_SVA_VTD_GPASID_CD | \
> + IOMMU_SVA_VTD_GPASID_EMTE | \
> + IOMMU_SVA_VTD_GPASID_PCD | \
> + IOMMU_SVA_VTD_GPASID_PWT)
> +/**
> + * struct iommu_gpasid_bind_data - Information about device and guest PASID binding
> + * @version: IOMMU_UAPI_VERSION
> + * @format: PASID table entry format
> + * @flags: Additional information on guest bind request
> + * @gpgd: Guest page directory base of the guest mm to bind
> + * @hpasid: Process address space ID used for the guest mm in host IOMMU
> + * @gpasid: Process address space ID used for the guest mm in guest IOMMU
> + * @addr_width: Guest virtual address width
> + * @padding: Reserved for future use (should be zero)
> + * @dummy Reserve space for vendor specific data in the union. New
> + * members added to the union cannot exceed the size of dummy.
> + * The fixed size union is needed to allow further expansion
> + * after the end of the union while still maintain backward
> + * compatibility.
> + * @vtd: Intel VT-d specific data
> + *
> + * Guest to host PASID mapping can be an identity or non-identity, where guest
> + * has its own PASID space. For non-identify mapping, guest to host PASID lookup
> + * is needed when VM programs guest PASID into an assigned device. VMM may
> + * trap such PASID programming then request host IOMMU driver to convert guest
> + * PASID to host PASID based on this bind data.
> + */
> +struct iommu_gpasid_bind_data {
> + __u32 version;
> +#define IOMMU_PASID_FORMAT_INTEL_VTD 1
> + __u32 format;
> +#define IOMMU_SVA_GPASID_VAL (1 << 0) /* guest PASID valid */
> + __u64 flags;
> + __u64 gpgd;
> + __u64 hpasid;
> + __u64 gpasid;
> + __u32 addr_width;
> + __u8 padding[12];
> + /* Vendor specific data */
> + union {
> + __u8 dummy[128];
> + struct iommu_gpasid_bind_data_vtd vtd;
> + };
> +};
> +
> +#endif /* _IOMMU_H */
> diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
> index fb10370..29d0071 100644
> --- a/linux-headers/linux/vfio.h
> +++ b/linux-headers/linux/vfio.h
> @@ -14,6 +14,7 @@
>
> #include <linux/types.h>
> #include <linux/ioctl.h>
> +#include <linux/iommu.h>
>
> #define VFIO_API_VERSION 0
>
> @@ -47,6 +48,15 @@
> #define VFIO_NOIOMMU_IOMMU 8
>
> /*
> + * Hardware IOMMUs with two-stage translation capability give userspace
> + * the ownership of stage-1 translation structures (e.g. page tables).
> + * VFIO exposes the two-stage IOMMU programming capability to userspace
> + * based on the IOMMU UAPIs. Therefore user of VFIO_TYPE1_NESTING should
> + * check the IOMMU UAPI version compatibility.
> + */
> +#define VFIO_NESTING_IOMMU_UAPI 9
> +
> +/*
> * 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
> @@ -748,6 +758,15 @@ struct vfio_iommu_type1_info_cap_iova_range {
> struct vfio_iova_range iova_ranges[];
> };
>
> +#define VFIO_IOMMU_TYPE1_INFO_CAP_NESTING 2
> +
> +struct vfio_iommu_type1_info_cap_nesting {
> + struct vfio_info_cap_header header;
> +#define VFIO_IOMMU_PASID_REQS (1 << 0)
> + __u32 nesting_capabilities;
> + __u32 stage1_formats;
> +};
> +
> #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
>
> /**
> @@ -794,6 +813,114 @@ struct vfio_iommu_type1_dma_unmap {
> #define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15)
> #define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16)
>
> +/*
> + * PASID (Process Address Space ID) is a PCIe concept which
> + * has been extended to support DMA isolation in fine-grain.
> + * With device assigned to user space (e.g. VMs), PASID alloc
> + * and free need to be system wide. This structure defines
> + * the info for pasid alloc/free between user space and kernel
> + * space.
> + *
> + * @flag=VFIO_IOMMU_PASID_ALLOC, refer to the @alloc_pasid
> + * @flag=VFIO_IOMMU_PASID_FREE, refer to @free_pasid
> + */
> +struct vfio_iommu_type1_pasid_request {
> + __u32 argsz;
> +#define VFIO_IOMMU_PASID_ALLOC (1 << 0)
> +#define VFIO_IOMMU_PASID_FREE (1 << 1)
> + __u32 flags;
> + union {
> + struct {
> + __u32 min;
> + __u32 max;
> + __u32 result;
> + } alloc_pasid;
> + __u32 free_pasid;
> + };
> +};
> +
> +#define VFIO_PASID_REQUEST_MASK (VFIO_IOMMU_PASID_ALLOC | \
> + VFIO_IOMMU_PASID_FREE)
> +
> +/**
> + * VFIO_IOMMU_PASID_REQUEST - _IOWR(VFIO_TYPE, VFIO_BASE + 22,
> + * struct vfio_iommu_type1_pasid_request)
> + *
> + * Availability of this feature depends on PASID support in the device,
> + * its bus, the underlying IOMMU and the CPU architecture. In VFIO, it
> + * is available after VFIO_SET_IOMMU.
> + *
> + * returns: 0 on success, -errno on failure.
> + */
> +#define VFIO_IOMMU_PASID_REQUEST _IO(VFIO_TYPE, VFIO_BASE + 22)
> +
> +/**
> + * Supported flags:
> + * - VFIO_IOMMU_BIND_GUEST_PGTBL: bind guest page tables to host for
> + * nesting type IOMMUs. In @data field It takes struct
> + * iommu_gpasid_bind_data.
> + * - VFIO_IOMMU_UNBIND_GUEST_PGTBL: undo a bind guest page table operation
> + * invoked by VFIO_IOMMU_BIND_GUEST_PGTBL.
> + *
> + */
> +struct vfio_iommu_type1_bind {
> + __u32 argsz;
> + __u32 flags;
> +#define VFIO_IOMMU_BIND_GUEST_PGTBL (1 << 0)
> +#define VFIO_IOMMU_UNBIND_GUEST_PGTBL (1 << 1)
> + __u8 data[];
> +};
> +
> +#define VFIO_IOMMU_BIND_MASK (VFIO_IOMMU_BIND_GUEST_PGTBL | \
> + VFIO_IOMMU_UNBIND_GUEST_PGTBL)
> +
> +/**
> + * VFIO_IOMMU_BIND - _IOW(VFIO_TYPE, VFIO_BASE + 23,
> + * struct vfio_iommu_type1_bind)
> + *
> + * Manage address spaces of devices in this container. Initially a TYPE1
> + * container can only have one address space, managed with
> + * VFIO_IOMMU_MAP/UNMAP_DMA.
> + *
> + * An IOMMU of type VFIO_TYPE1_NESTING_IOMMU can be managed by both MAP/UNMAP
> + * and BIND ioctls at the same time. MAP/UNMAP acts on the stage-2 (host) page
> + * tables, and BIND manages the stage-1 (guest) page tables. Other types of
> + * IOMMU may allow MAP/UNMAP and BIND to coexist, where MAP/UNMAP controls
> + * the traffics only require single stage translation while BIND controls the
> + * traffics require nesting translation. But this depends on the underlying
> + * IOMMU architecture and isn't guaranteed. Example of this is the guest SVA
> + * traffics, such traffics need nesting translation to gain gVA->gPA and then
> + * gPA->hPA translation.
> + *
> + * Availability of this feature depends on the device, its bus, the underlying
> + * IOMMU and the CPU architecture.
> + *
> + * returns: 0 on success, -errno on failure.
> + */
> +#define VFIO_IOMMU_BIND _IO(VFIO_TYPE, VFIO_BASE + 23)
> +
> +/**
> + * VFIO_IOMMU_CACHE_INVALIDATE - _IOW(VFIO_TYPE, VFIO_BASE + 24,
> + * struct vfio_iommu_type1_cache_invalidate)
> + *
> + * Propagate guest IOMMU cache invalidation to the host. The cache
> + * invalidation information is conveyed by @cache_info, the content
> + * format would be structures defined in uapi/linux/iommu.h. User
> + * should be aware of that the struct iommu_cache_invalidate_info
> + * has a @version field, vfio needs to parse this field before getting
> + * data from userspace.
> + *
> + * Availability of this IOCTL is after VFIO_SET_IOMMU.
> + *
> + * returns: 0 on success, -errno on failure.
> + */
> +struct vfio_iommu_type1_cache_invalidate {
> + __u32 argsz;
> + __u32 flags;
> + struct iommu_cache_invalidate_info cache_info;
> +};
> +#define VFIO_IOMMU_CACHE_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 24)
> +
> /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
>
> /*
>
