Mark all ABI structs with structs.HostLayout; verify this remains true.

This change marks all ABI-related structs with `structs.HostLayout`, which was introduced in Go 1.23: https://pkg.go.dev/[email protected]#HostLayout This is intended to force the Go compiler to preserve the layout of the struct, removing it from the liberty of reordering fields as it sees fit. Adds a check automatically generated by our `go_library` rule wrapper which verifies this recursively for all exported structs in a package. Fixes issue #10693. PiperOrigin-RevId: 860238103
2026-09-24 17:04:14 +00:00 · 2026-01-23 13:45:28 -08:00
parent 3926089572
commit 056a85f39d
69 changed files with 901 additions and 47 deletions
@@ -12,5 +12,6 @@ go_library(
        "abi_linux.go",
        "flag.go",
    ],
+    hostlayout = True,
    visibility = ["//:sandbox"],
 )
@@ -8,5 +8,6 @@ package(
 go_library(
    name = "attestation",
    srcs = ["attestation.go"],
+    hostlayout = True,
    visibility = ["//visibility:public"],
 )
@@ -15,6 +15,10 @@
 // Package attestation includes definitions needed for gVisor attestation.
 package attestation

+import (
+	"structs"
+)
+
 // Attestation ioctls.
 const (
 	SIGN_ATTESTATION_REPORT = 0
@@ -29,7 +33,8 @@ const SizeOfQuoteInputData = 64
 // size is an input that specifies the size of buf. When returned, it's updated
 // to the size of quote.
 type SignReport struct {
+	_    structs.HostLayout
 	data [64]byte
 	size uint32
-	buf  []byte
+	buf  []byte `hostlayout:"ignore"`
 }
@@ -9,6 +9,7 @@ go_library(
    srcs = [
        "gasket.go",
    ],
+    hostlayout = True,
    marshal = True,
    visibility = ["//pkg/sentry:internal"],
    deps = ["//pkg/abi/linux"],
@@ -17,6 +17,7 @@ package gasket

 import (
 	"fmt"
+	"structs"

 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
@@ -80,6 +81,7 @@ func (i Ioctl) String() string {
 //
 // +marshal
 type GasketInterruptEventFd struct {
+	_         structs.HostLayout
 	Interrupt uint64
 	EventFD   uint64
 }
@@ -89,6 +91,7 @@ type GasketInterruptEventFd struct {
 //
 // +marshal
 type GasketPageTableIoctl struct {
+	_              structs.HostLayout
 	PageTableIndex uint64
 	Size           uint64
 	HostAddress    uint64
@@ -101,6 +104,7 @@ type GasketPageTableIoctl struct {
 //
 // +marshal
 type GasketInterruptMapping struct {
+	_         structs.HostLayout
 	Interrupt uint64
 	EventFD   uint64
 	BarIndex  uint64
@@ -112,6 +116,7 @@ type GasketInterruptMapping struct {
 //
 // +marshal
 type GasketPageTableDmaBufIoctl struct {
+	_              structs.HostLayout
 	PageTableIndex uint64
 	DeviceAddress  uint64
 	DMABufID       int32 `marshal:"unaligned"` // Struct ends mid 64bit word.
@@ -88,6 +88,7 @@ go_library(
        "wait.go",
        "xattr.go",
    ],
+    hostlayout = True,
    marshal = True,
    visibility = ["//visibility:public"],
    deps = [
@@ -14,11 +14,15 @@

 package linux

-import "encoding/binary"
+import (
+	"encoding/binary"
+	"structs"
+)

 // AIORing is struct aio_ring, from fs/aio.c, without the trailing
 // variable-length array.
 type AIORing struct {
+	_                structs.HostLayout
 	ID               uint32
 	Nr               uint32
 	Head             uint32
@@ -62,6 +66,7 @@ const (
 //
 // +marshal
 type IOCallback struct {
+	_    structs.HostLayout
 	Data uint64
 	Key  uint32
 	_    uint32
@@ -86,6 +91,7 @@ type IOCallback struct {
 // +marshal
 // +stateify savable
 type IOEvent struct {
+	_       structs.HostLayout
 	Data    uint64
 	Obj     uint64
 	Result  int64
@@ -14,11 +14,16 @@

 package linux

+import (
+	"structs"
+)
+
 // BPFInstruction is a raw BPF virtual machine instruction.
 //
 // +marshal slice:BPFInstructionSlice
 // +stateify savable
 type BPFInstruction struct {
+	_ structs.HostLayout
 	// OpCode is the operation to execute.
 	OpCode uint16

@@ -16,6 +16,7 @@ package linux

 import (
 	"strings"
+	"structs"
 )

 // A Capability represents the ability to perform a privileged operation.
@@ -254,6 +255,7 @@ const (
 //
 // +marshal
 type VfsCapData struct {
+	_             structs.HostLayout
 	MagicEtc      uint32
 	PermittedLo   uint32
 	InheritableLo uint32
@@ -287,6 +289,7 @@ func (c *VfsCapData) ToString() string {
 //
 // +marshal
 type VfsNsCapData struct {
+	_ structs.HostLayout
 	VfsCapData
 	RootID uint32
 }
@@ -323,6 +326,7 @@ func (c *VfsNsCapData) ToString() string {
 //
 // +marshal
 type CapUserHeader struct {
+	_       structs.HostLayout
 	Version uint32
 	Pid     int32
 }
@@ -331,6 +335,7 @@ type CapUserHeader struct {
 //
 // +marshal slice:CapUserDataSlice
 type CapUserData struct {
+	_           structs.HostLayout
 	Effective   uint32
 	Permitted   uint32
 	Inheritable uint32
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Clone constants per clone(2).
 const (
 	CSIGNAL = 0xff
@@ -57,6 +61,7 @@ const (
 //
 // +marshal
 type CloneArgs struct {
+	_          structs.HostLayout
 	Flags      uint64
 	Pidfd      uint64
 	ChildTID   uint64
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Linux auxiliary vector entry types.
 const (
 	// AT_NULL is the end of the auxiliary vector.
@@ -111,6 +115,7 @@ const (
 //
 // +marshal
 type ElfHeader64 struct {
+	_         structs.HostLayout
 	Ident     [16]byte // File identification.
 	Type      uint16   // File type.
 	Machine   uint16   // Machine architecture.
@@ -131,6 +136,7 @@ type ElfHeader64 struct {
 //
 // +marshal
 type ElfSection64 struct {
+	_         structs.HostLayout
 	Name      uint32 // Section name (index into the section header string table).
 	Type      uint32 // Section type.
 	Flags     uint64 // Section flags.
@@ -147,6 +153,7 @@ type ElfSection64 struct {
 //
 // +marshal
 type ElfProg64 struct {
+	_      structs.HostLayout
 	Type   uint32 // Entry type.
 	Flags  uint32 // Access permission flags.
 	Off    uint64 // File offset of contents.
@@ -17,10 +17,15 @@

 package linux

+import (
+	"structs"
+)
+
 // EpollEvent is equivalent to struct epoll_event from epoll(2).
 //
 // +marshal slice:EpollEventSlice
 type EpollEvent struct {
+	_      structs.HostLayout
 	Events uint32
 	// Linux makes struct epoll_event::data a __u64. We represent it as
 	// [2]int32 because, on amd64, Linux also makes struct epoll_event
@@ -17,10 +17,15 @@

 package linux

+import (
+	"structs"
+)
+
 // EpollEvent is equivalent to struct epoll_event from epoll(2).
 //
 // +marshal slice:EpollEventSlice
 type EpollEvent struct {
+	_      structs.HostLayout
 	Events uint32
 	// Linux makes struct epoll_event a __u64, necessitating 4 bytes of padding
 	// here.
@@ -8,5 +8,6 @@ package(
 go_library(
    name = "errno",
    srcs = ["errno.go"],
+    hostlayout = True,
    visibility = ["//visibility:public"],
 )
@@ -15,6 +15,8 @@
 package linux

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/marshal"
 )

@@ -31,6 +33,7 @@ const (
 //
 // +marshal
 type SockExtendedErr struct {
+	_      structs.HostLayout
 	Errno  uint32
 	Origin uint8
 	Type   uint8
@@ -54,6 +57,7 @@ type SockErrCMsg interface {
 //
 // +marshal
 type SockErrCMsgIPv4 struct {
+	_ structs.HostLayout
 	SockExtendedErr
 	Offender SockAddrInet
 }
@@ -76,6 +80,7 @@ func (*SockErrCMsgIPv4) CMsgType() uint32 {
 //
 // +marshal
 type SockErrCMsgIPv6 struct {
+	_ structs.HostLayout
 	SockExtendedErr
 	Offender SockAddrInet6
 }
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Commands from linux/fcntl.h.
 const (
 	F_DUPFD         = 0
@@ -54,6 +58,7 @@ const (
 //
 // +marshal
 type Flock struct {
+	_      structs.HostLayout
 	Type   int16
 	Whence int16
 	_      [4]byte
@@ -74,6 +79,7 @@ const (
 //
 // +marshal
 type FOwnerEx struct {
+	_    structs.HostLayout
 	Type int32
 	PID  int32
 }
@@ -17,6 +17,7 @@ package linux
 import (
 	"fmt"
 	"strings"
+	"structs"

 	"gvisor.dev/gvisor/pkg/abi"
 )
@@ -284,6 +285,7 @@ const (
 //
 // +marshal boundCheck slice:StatxSlice
 type Statx struct {
+	_              structs.HostLayout
 	Mask           uint32
 	Blksize        uint32
 	Attributes     uint64
@@ -17,6 +17,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Constants for open(2).
 const (
 	O_DIRECT    = 000040000
@@ -29,6 +33,7 @@ const (
 //
 // +marshal
 type Stat struct {
+	_       structs.HostLayout
 	Dev     uint64
 	Ino     uint64
 	Nlink   uint64
@@ -17,6 +17,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Constants for open(2).
 const (
 	O_DIRECTORY = 000040000
@@ -29,6 +33,7 @@ const (
 //
 // +marshal
 type Stat struct {
+	_       structs.HostLayout
 	Dev     uint64
 	Ino     uint64
 	Mode    uint32
@@ -16,6 +16,7 @@ package linux

 import (
 	"math"
+	"structs"

 	"gvisor.dev/gvisor/pkg/hostarch"
 )
@@ -66,6 +67,7 @@ const (
 //
 // +marshal
 type Statfs struct {
+	_ structs.HostLayout
 	// Type is one of the filesystem magic values, defined above.
 	Type uint64

@@ -15,6 +15,7 @@
 package linux

 import (
+	"structs"
 	"time"

 	"gvisor.dev/gvisor/pkg/marshal/primitive"
@@ -93,6 +94,7 @@ const (
 // +marshal
 // +stateify savable
 type FUSEHeaderIn struct {
+	_ structs.HostLayout
 	// Len specifies the total length of the data, including this header.
 	Len uint32

@@ -127,6 +129,7 @@ var SizeOfFUSEHeaderIn = uint32((*FUSEHeaderIn)(nil).SizeBytes())
 // +marshal
 // +stateify savable
 type FUSEHeaderOut struct {
+	_ structs.HostLayout
 	// Len specifies the total length of the data, including this header.
 	Len uint32

@@ -182,6 +185,7 @@ const (
 //
 // +marshal
 type FUSEInitIn struct {
+	_ structs.HostLayout
 	// Major version supported by kernel.
 	Major uint32

@@ -201,6 +205,7 @@ type FUSEInitIn struct {
 //
 // +marshal
 type FUSEInitOut struct {
+	_ structs.HostLayout
 	// Major version supported by daemon.
 	Major uint32

@@ -249,6 +254,7 @@ type FUSEInitOut struct {
 //
 // +marshal
 type FUSEStatfsOut struct {
+	_ structs.HostLayout
 	// Blocks is the maximum number of data blocks the filesystem may store, in
 	// units of BlockSize.
 	Blocks uint64
@@ -290,6 +296,7 @@ const FUSE_GETATTR_FH = (1 << 0)
 //
 // +marshal
 type FUSEGetAttrIn struct {
+	_ structs.HostLayout
 	// GetAttrFlags specifies whether getattr request is sent with a nodeid or
 	// with a file handle.
 	GetAttrFlags uint32
@@ -305,6 +312,7 @@ type FUSEGetAttrIn struct {
 //
 // +marshal
 type FUSEAttr struct {
+	_ structs.HostLayout
 	// Ino is the inode number of this file.
 	Ino uint64

@@ -376,6 +384,7 @@ func (a FUSEAttr) CTimeNsec() int64 {
 //
 // +marshal
 type FUSEAttrOut struct {
+	_ structs.HostLayout
 	// AttrValid and AttrValidNsec describe the attribute cache duration
 	AttrValid uint64

@@ -394,6 +403,7 @@ type FUSEAttrOut struct {
 //
 // +marshal
 type FUSEEntryOut struct {
+	_ structs.HostLayout
 	// NodeID is the ID for current inode.
 	NodeID uint64

@@ -445,6 +455,7 @@ func (s *CString) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSELookupIn struct {
+	_ structs.HostLayout
 	// Name is a file name to be looked up.
 	Name CString
 }
@@ -488,6 +499,7 @@ const (
 //
 // +marshal
 type FUSEOpenIn struct {
+	_ structs.HostLayout
 	// Flags of this open request.
 	Flags uint32

@@ -499,6 +511,7 @@ type FUSEOpenIn struct {
 //
 // +marshal
 type FUSEOpenOut struct {
+	_ structs.HostLayout
 	// Fh is the file handler for opened files.
 	Fh uint64

@@ -513,6 +526,7 @@ type FUSEOpenOut struct {
 //
 // +marshal
 type FUSECreateOut struct {
+	_ structs.HostLayout
 	FUSEEntryOut
 	FUSEOpenOut
 }
@@ -527,6 +541,7 @@ const (
 //
 // +marshal
 type FUSEReadIn struct {
+	_ structs.HostLayout
 	// Fh is the file handle in userspace.
 	Fh uint64

@@ -559,6 +574,7 @@ type FUSEReadIn struct {
 //
 // +marshal
 type FUSEWriteIn struct {
+	_ structs.HostLayout
 	// Fh is the file handle in userspace.
 	Fh uint64

@@ -589,8 +605,9 @@ var SizeOfFUSEWriteIn = uint32((*FUSEWriteIn)(nil).SizeBytes())
 //
 // +marshal dynamic
 type FUSEWritePayloadIn struct {
+	_       structs.HostLayout
 	Header  FUSEWriteIn
-	Payload primitive.ByteSlice
+	Payload primitive.ByteSlice `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -618,6 +635,7 @@ func (r *FUSEWritePayloadIn) UnmarshalBytes(src []byte) []byte {
 //
 // +marshal
 type FUSEWriteOut struct {
+	_ structs.HostLayout
 	// Size is the number of bytes written.
 	Size uint32

@@ -629,6 +647,7 @@ type FUSEWriteOut struct {
 //
 // +marshal
 type FUSEReleaseIn struct {
+	_ structs.HostLayout
 	// Fh is the file handler for the file to be released.
 	Fh uint64

@@ -647,6 +666,7 @@ type FUSEReleaseIn struct {
 //
 // +marshal
 type FUSECreateMeta struct {
+	_ structs.HostLayout
 	// Flags of the creating file.
 	Flags uint32

@@ -662,6 +682,7 @@ type FUSECreateMeta struct {
 //
 // +marshal dynamic
 type FUSERenameIn struct {
+	_       structs.HostLayout
 	Newdir  primitive.Uint64
 	Oldname CString
 	Newname CString
@@ -689,6 +710,7 @@ func (r *FUSERenameIn) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSECreateIn struct {
+	_ structs.HostLayout
 	// CreateMeta contains mode, rdev and umash fields for FUSE_MKNODS.
 	CreateMeta FUSECreateMeta

@@ -717,6 +739,7 @@ func (r *FUSECreateIn) SizeBytes() int {
 //
 // +marshal
 type FUSEMknodMeta struct {
+	_ structs.HostLayout
 	// Mode of the inode to create.
 	Mode uint32

@@ -734,6 +757,7 @@ type FUSEMknodMeta struct {
 //
 // +marshal dynamic
 type FUSEMknodIn struct {
+	_ structs.HostLayout
 	// MknodMeta contains mode, rdev and umash fields for FUSE_MKNODS.
 	MknodMeta FUSEMknodMeta
 	// Name is the name of the node to create.
@@ -761,6 +785,7 @@ func (r *FUSEMknodIn) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSESymlinkIn struct {
+	_ structs.HostLayout
 	// Name of symlink to create.
 	Name CString

@@ -788,6 +813,7 @@ func (r *FUSESymlinkIn) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSELinkIn struct {
+	_ structs.HostLayout
 	// OldNodeID is the ID of the inode that is being linked to.
 	OldNodeID primitive.Uint64
 	// Name of the new hard link to create.
@@ -813,7 +839,9 @@ func (r *FUSELinkIn) SizeBytes() int {
 // FUSEEmptyIn is used by operations without request body.
 //
 // +marshal dynamic
-type FUSEEmptyIn struct{}
+type FUSEEmptyIn struct {
+	_ structs.HostLayout
+}

 // MarshalBytes implements marshal.Marshallable.MarshalBytes.
 func (r *FUSEEmptyIn) MarshalBytes(buf []byte) []byte {
@@ -835,6 +863,7 @@ func (r *FUSEEmptyIn) SizeBytes() int {
 //
 // +marshal
 type FUSEMkdirMeta struct {
+	_ structs.HostLayout
 	// Mode of the directory of create.
 	Mode uint32
 	// Umask is the user file creation mask.
@@ -846,6 +875,7 @@ type FUSEMkdirMeta struct {
 //
 // +marshal dynamic
 type FUSEMkdirIn struct {
+	_ structs.HostLayout
 	// MkdirMeta contains Mode and Umask of the directory to create.
 	MkdirMeta FUSEMkdirMeta
 	// Name of the directory to create.
@@ -873,6 +903,7 @@ func (r *FUSEMkdirIn) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSERmDirIn struct {
+	_ structs.HostLayout
 	// Name is a directory name to be removed.
 	Name CString
 }
@@ -897,7 +928,8 @@ func (r *FUSERmDirIn) SizeBytes() int {
 //
 // +marshal dynamic
 type FUSEDirents struct {
-	Dirents []*FUSEDirent
+	_       structs.HostLayout
+	Dirents []*FUSEDirent `hostlayout:"ignore"`
 }

 // FUSEDirent is a Dirent received from the FUSE daemon server.
@@ -905,10 +937,11 @@ type FUSEDirents struct {
 //
 // +marshal dynamic
 type FUSEDirent struct {
+	_ structs.HostLayout
 	// Meta contains all the static fields of FUSEDirent.
 	Meta FUSEDirentMeta
 	// Name is the filename of the dirent.
-	Name string
+	Name string `hostlayout:"ignore"`
 }

 // FUSEDirentMeta contains all the static fields of FUSEDirent.
@@ -916,6 +949,7 @@ type FUSEDirent struct {
 //
 // +marshal
 type FUSEDirentMeta struct {
+	_ structs.HostLayout
 	// Inode of the dirent.
 	Ino uint64
 	// Offset of the dirent.
@@ -1027,6 +1061,7 @@ const (
 //
 // +marshal
 type FUSESetAttrIn struct {
+	_ structs.HostLayout
 	// Valid indicates which attributes are modified by this request.
 	Valid uint32

@@ -1078,6 +1113,7 @@ type FUSESetAttrIn struct {
 //
 // +marshal dynamic
 type FUSEUnlinkIn struct {
+	_ structs.HostLayout
 	// Name of the node to unlink.
 	Name CString
 }
@@ -1102,6 +1138,7 @@ func (r *FUSEUnlinkIn) SizeBytes() int {
 //
 // +marshal
 type FUSEFsyncIn struct {
+	_  structs.HostLayout
 	Fh uint64

 	FsyncFlags uint32
@@ -1115,6 +1152,7 @@ type FUSEFsyncIn struct {
 //
 // +marshal
 type FUSEAccessIn struct {
+	_    structs.HostLayout
 	Mask uint32
 	// padding
 	_ uint32
@@ -1125,6 +1163,7 @@ type FUSEAccessIn struct {
 //
 // +marshal
 type FUSEFallocateIn struct {
+	_      structs.HostLayout
 	Fh     uint64
 	Offset uint64
 	Length uint64
@@ -1138,6 +1177,7 @@ type FUSEFallocateIn struct {
 //
 // +marshal
 type FUSEFlushIn struct {
+	_         structs.HostLayout
 	Fh        uint64
 	_         uint32 // unused
 	_         uint32 // padding
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // From <linux/futex.h> and <sys/time.h>.
 // Flags are used in syscall futex(2).
 const (
@@ -71,6 +75,7 @@ const ROBUST_LIST_LIMIT = 2048
 //
 // +marshal
 type RobustListHead struct {
+	_             structs.HostLayout
 	List          uint64
 	FutexOffset   uint64
 	ListOpPending uint64
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Constants for io_uring_setup(2). See include/uapi/linux/io_uring.h.
 const (
 	IORING_SETUP_IOPOLL     = (1 << 0)
@@ -75,6 +79,7 @@ type IORingIndex uint32
 //
 // +marshal
 type IOSqRingOffsets struct {
+	_           structs.HostLayout
 	Head        uint32 // Offset to io_rings.sq.head
 	Tail        uint32 // Offset to io_rings.sq.tail
 	RingMask    uint32 // Offset to io_rings.sq_ring_mask
@@ -92,6 +97,7 @@ type IOSqRingOffsets struct {
 //
 // +marshal
 type IOCqRingOffsets struct {
+	_           structs.HostLayout
 	Head        uint32 // Offset to io_rings.cq.head
 	Tail        uint32 // Offset to io_rings.cq.tail
 	RingMask    uint32 // Offset to io_rings.cq_ring_mask
@@ -108,6 +114,7 @@ type IOCqRingOffsets struct {
 //
 // +marshal
 type IOUringParams struct {
+	_            structs.HostLayout
 	SqEntries    uint32
 	CqEntries    uint32
 	Flags        uint32
@@ -128,6 +135,7 @@ type IOUringParams struct {
 // +marshal
 // +stateify savable
 type IOUringCqe struct {
+	_        structs.HostLayout
 	UserData uint64
 	Res      int32
 	Flags    uint32
@@ -139,6 +147,7 @@ type IOUringCqe struct {
 // +marshal
 // +stateify savable
 type IOUring struct {
+	_ structs.HostLayout
 	// Both head and tail should be cacheline aligned. And we assume that
 	// cacheline size is 64 bytes.
 	Head uint32
@@ -154,6 +163,7 @@ type IOUring struct {
 // +marshal
 // +stateify savable
 type IORings struct {
+	_             structs.HostLayout
 	Sq            IOUring
 	Cq            IOUring
 	SqRingMask    uint32
@@ -177,6 +187,7 @@ type IORings struct {
 // +marshal
 // +stateify savable
 type IOUringSqe struct {
+	_                   structs.HostLayout
 	Opcode              uint8
 	Flags               uint8
 	IoPrio              uint16
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Control commands used with semctl, shmctl, and msgctl.
 //
 // Source: include/uapi/linux/ipc.h.
@@ -46,6 +50,7 @@ const (
 //
 // +marshal
 type IPCPerm struct {
+	_       structs.HostLayout
 	Key     uint32
 	UID     uint32
 	GID     uint32
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Resources for getrlimit(2)/setrlimit(2)/prlimit(2).
 const (
 	RLIMIT_CPU        = 0
@@ -36,6 +40,7 @@ const (

 // RLimit corresponds to Linux's struct rlimit.
 type RLimit struct {
+	_ structs.HostLayout
 	// Cur specifies the soft limit.
 	Cur uint64
 	// Max specifies the hard limit.
@@ -69,20 +74,20 @@ const (
 // InitRLimits is a map of initial rlimits set by Linux in
 // include/asm-generic/resource.h.
 var InitRLimits = map[int]RLimit{
-	RLIMIT_CPU:        {RLimInfinity, RLimInfinity},
-	RLIMIT_FSIZE:      {RLimInfinity, RLimInfinity},
-	RLIMIT_DATA:       {RLimInfinity, RLimInfinity},
-	RLIMIT_STACK:      {DefaultStackSoftLimit, RLimInfinity},
-	RLIMIT_CORE:       {0, RLimInfinity},
-	RLIMIT_RSS:        {RLimInfinity, RLimInfinity},
-	RLIMIT_NPROC:      {DefaultNprocLimit, DefaultNprocLimit},
-	RLIMIT_NOFILE:     {DefaultNofileSoftLimit, DefaultNofileHardLimit},
-	RLIMIT_MEMLOCK:    {DefaultMemlockLimit, DefaultMemlockLimit},
-	RLIMIT_AS:         {RLimInfinity, RLimInfinity},
-	RLIMIT_LOCKS:      {RLimInfinity, RLimInfinity},
-	RLIMIT_SIGPENDING: {0, 0},
-	RLIMIT_MSGQUEUE:   {DefaultMsgqueueLimit, DefaultMsgqueueLimit},
-	RLIMIT_NICE:       {0, 0},
-	RLIMIT_RTPRIO:     {0, 0},
-	RLIMIT_RTTIME:     {RLimInfinity, RLimInfinity},
+	RLIMIT_CPU:        {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_FSIZE:      {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_DATA:       {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_STACK:      {Cur: DefaultStackSoftLimit, Max: RLimInfinity},
+	RLIMIT_CORE:       {Cur: 0, Max: RLimInfinity},
+	RLIMIT_RSS:        {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_NPROC:      {Cur: DefaultNprocLimit, Max: DefaultNprocLimit},
+	RLIMIT_NOFILE:     {Cur: DefaultNofileSoftLimit, Max: DefaultNofileHardLimit},
+	RLIMIT_MEMLOCK:    {Cur: DefaultMemlockLimit, Max: DefaultMemlockLimit},
+	RLIMIT_AS:         {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_LOCKS:      {Cur: RLimInfinity, Max: RLimInfinity},
+	RLIMIT_SIGPENDING: {Cur: 0, Max: 0},
+	RLIMIT_MSGQUEUE:   {Cur: DefaultMsgqueueLimit, Max: DefaultMsgqueueLimit},
+	RLIMIT_NICE:       {Cur: 0, Max: 0},
+	RLIMIT_RTPRIO:     {Cur: 0, Max: 0},
+	RLIMIT_RTTIME:     {Cur: RLimInfinity, Max: RLimInfinity},
 }
@@ -16,6 +16,10 @@
 // Linux kernel.
 package linux

+import (
+	"structs"
+)
+
 // NumSoftIRQ is the number of software IRQs, exposed via /proc/stat.
 //
 // Defined in linux/interrupt.h.
@@ -25,6 +29,7 @@ const NumSoftIRQ = 10
 //
 // +marshal
 type Sysinfo struct {
+	_         structs.HostLayout
 	Uptime    int64
 	Loads     [3]uint64
 	TotalRAM  uint64
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Default values for POSIX message queues. Source:
 // include/linux/ipc_namespace.h
 const (
@@ -47,6 +51,7 @@ const (
 //
 // +marshal
 type MqAttr struct {
+	_         structs.HostLayout
 	MqFlags   int64    // Message queue flags.
 	MqMaxmsg  int64    // Maximum number of messages.
 	MqMsgsize int64    // Maximum message size.
@@ -15,6 +15,8 @@
 package linux

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/marshal/primitive"
 )

@@ -55,6 +57,7 @@ const (
 //
 // +marshal
 type MsqidDS struct {
+	_         structs.HostLayout
 	MsgPerm   IPCPerm // IPC permissions.
 	MsgStime  TimeT   // Last msgsnd time.
 	MsgRtime  TimeT   // Last msgrcv time.
@@ -72,8 +75,9 @@ type MsqidDS struct {
 //
 // +marshal dynamic
 type MsgBuf struct {
+	_    structs.HostLayout
 	Type primitive.Int64
-	Text primitive.ByteSlice
+	Text primitive.ByteSlice `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -97,6 +101,7 @@ func (b *MsgBuf) UnmarshalBytes(src []byte) []byte {
 //
 // +marshal
 type MsgInfo struct {
+	_       structs.HostLayout
 	MsgPool int32
 	MsgMap  int32
 	MsgMax  int32
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 const (
 	// IFNAMSIZ is the size of the name field for IFReq.
 	IFNAMSIZ = 16
@@ -23,6 +27,7 @@ const (
 //
 // +marshal
 type IFReq struct {
+	_ structs.HostLayout
 	// IFName is an encoded name, normally null-terminated. This should be
 	// accessed via the Name and SetName functions.
 	IFName [IFNAMSIZ]byte
@@ -66,6 +71,7 @@ var SizeOfIFReq = (*IFReq)(nil).SizeBytes()

 // IFMap contains interface hardware parameters.
 type IFMap struct {
+	_        structs.HostLayout
 	MemStart uint64
 	MemEnd   uint64
 	BaseAddr int16
@@ -80,6 +86,7 @@ type IFMap struct {
 //
 // +marshal
 type IFConf struct {
+	_   structs.HostLayout
 	Len int32
 	_   [4]byte // Pad to sizeof(struct ifconf).
 	Ptr uint64
@@ -106,6 +113,7 @@ const (
 //
 // +marshal
 type EthtoolGFeatures struct {
+	_    structs.HostLayout
 	Cmd  uint32
 	Size uint32
 }
@@ -116,6 +124,7 @@ type EthtoolGFeatures struct {
 //
 // +marshal
 type EthtoolGetFeaturesBlock struct {
+	_            structs.HostLayout
 	Available    uint32
 	Requested    uint32
 	Active       uint32
@@ -15,6 +15,8 @@
 package linux

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/marshal"
 	"gvisor.dev/gvisor/pkg/marshal/primitive"
 )
@@ -109,6 +111,7 @@ const (
 //
 // +marshal
 type IPTEntry struct {
+	_ structs.HostLayout
 	// IP is used to filter packets based on the IP header.
 	IP IPTIP

@@ -148,13 +151,14 @@ const SizeOfIPTEntry = 112
 //
 // +marshal dynamic
 type KernelIPTEntry struct {
+	_     structs.HostLayout
 	Entry IPTEntry

 	// Elems holds the data for all this rule's matches followed by the
 	// target. It is variable length -- users have to iterate over any
 	// matches and use TargetOffset and NextOffset to make sense of the
 	// data.
-	Elems primitive.ByteSlice
+	Elems primitive.ByteSlice `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -182,6 +186,7 @@ var _ marshal.Marshallable = (*KernelIPTEntry)(nil)
 //
 // +marshal
 type IPTIP struct {
+	_ structs.HostLayout
 	// Src is the source IP address.
 	Src InetAddr

@@ -246,6 +251,7 @@ const SizeOfIPTIP = 84
 //
 // +marshal
 type XTCounters struct {
+	_ structs.HostLayout
 	// Pcnt is the packet count.
 	Pcnt uint64

@@ -267,6 +273,7 @@ const SizeOfXTCounters = 16
 //
 // +marshal
 type XTEntryMatch struct {
+	_         structs.HostLayout
 	MatchSize uint16
 	Name      ExtensionName
 	Revision  uint8
@@ -281,8 +288,9 @@ const SizeOfXTEntryMatch = 32
 // KernelXTEntryMatch is identical to XTEntryMatch, but contains
 // variable-length Data field.
 type KernelXTEntryMatch struct {
+	_ structs.HostLayout
 	XTEntryMatch
-	Data []byte
+	Data []byte `hostlayout:"ignore"`
 }

 // XTGetRevision corresponds to xt_get_revision in
@@ -290,6 +298,7 @@ type KernelXTEntryMatch struct {
 //
 // +marshal
 type XTGetRevision struct {
+	_        structs.HostLayout
 	Name     ExtensionName
 	Revision uint8
 }
@@ -308,6 +317,7 @@ const SizeOfXTGetRevision = 30
 //
 // +marshal
 type XTEntryTarget struct {
+	_          structs.HostLayout
 	TargetSize uint16
 	Name       ExtensionName
 	Revision   uint8
@@ -322,8 +332,9 @@ const SizeOfXTEntryTarget = 32
 // KernelXTEntryTarget is identical to XTEntryTarget, but contains a
 // variable-length Data field.
 type KernelXTEntryTarget struct {
+	_ structs.HostLayout
 	XTEntryTarget
-	Data []byte
+	Data []byte `hostlayout:"ignore"`
 }

 // XTStandardTarget is a built-in target, one of ACCEPT, DROP, JUMP, QUEUE,
@@ -332,6 +343,7 @@ type KernelXTEntryTarget struct {
 //
 // +marshal
 type XTStandardTarget struct {
+	_      structs.HostLayout
 	Target XTEntryTarget
 	// A positive verdict indicates a jump, and is the offset from the
 	// start of the table to jump to. A negative value means one of the
@@ -350,6 +362,7 @@ const SizeOfXTStandardTarget = 40
 //
 // +marshal
 type XTErrorTarget struct {
+	_      structs.HostLayout
 	Target XTEntryTarget
 	Name   ErrorName
 	_      [2]byte
@@ -379,6 +392,7 @@ const (
 //
 // +marshal
 type NfNATIPV4Range struct {
+	_       structs.HostLayout
 	Flags   uint32
 	MinIP   [4]byte
 	MaxIP   [4]byte
@@ -391,6 +405,7 @@ type NfNATIPV4Range struct {
 //
 // +marshal
 type NfNATIPV4MultiRangeCompat struct {
+	_         structs.HostLayout
 	RangeSize uint32
 	RangeIPV4 NfNATIPV4Range
 }
@@ -400,6 +415,7 @@ type NfNATIPV4MultiRangeCompat struct {
 //
 // +marshal
 type XTRedirectTarget struct {
+	_       structs.HostLayout
 	Target  XTEntryTarget
 	NfRange NfNATIPV4MultiRangeCompat
 	_       [4]byte
@@ -413,6 +429,7 @@ const SizeOfXTRedirectTarget = 56
 //
 // +marshal
 type XTNATTargetV0 struct {
+	_       structs.HostLayout
 	Target  XTEntryTarget
 	NfRange NfNATIPV4MultiRangeCompat
 	_       [4]byte
@@ -425,6 +442,7 @@ const SizeOfXTNATTargetV0 = 56
 //
 // +marshal
 type XTNATTargetV1 struct {
+	_      structs.HostLayout
 	Target XTEntryTarget
 	Range  NFNATRange
 }
@@ -436,6 +454,7 @@ const SizeOfXTNATTargetV1 = SizeOfXTEntryTarget + SizeOfNFNATRange
 //
 // +marshal
 type XTNATTargetV2 struct {
+	_      structs.HostLayout
 	Target XTEntryTarget
 	Range  NFNATRange2
 }
@@ -448,6 +467,7 @@ const SizeOfXTNATTargetV2 = SizeOfXTEntryTarget + SizeOfNFNATRange2
 //
 // +marshal
 type IPTGetinfo struct {
+	_          structs.HostLayout
 	Name       TableName
 	ValidHooks uint32
 	HookEntry  [NF_INET_NUMHOOKS]uint32
@@ -465,6 +485,7 @@ const SizeOfIPTGetinfo = 84
 //
 // +marshal
 type IPTGetEntries struct {
+	_    structs.HostLayout
 	Name TableName
 	Size uint32
 	_    [4]byte
@@ -482,8 +503,9 @@ const SizeOfIPTGetEntries = 40
 //
 // +marshal dynamic
 type KernelIPTGetEntries struct {
+	_ structs.HostLayout
 	IPTGetEntries
-	Entrytable []KernelIPTEntry
+	Entrytable []KernelIPTEntry `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -521,6 +543,7 @@ var _ marshal.Marshallable = (*KernelIPTGetEntries)(nil)
 //
 // +marshal
 type IPTReplace struct {
+	_           structs.HostLayout
 	Name        TableName
 	ValidHooks  uint32
 	NumEntries  uint32
@@ -582,6 +605,7 @@ func goString(cstring []byte) string {
 //
 // +marshal
 type XTTCP struct {
+	_ structs.HostLayout
 	// SourcePortStart specifies the inclusive start of the range of source
 	// ports to which the matcher applies.
 	SourcePortStart uint16
@@ -637,6 +661,7 @@ const (
 //
 // +marshal
 type XTUDP struct {
+	_ structs.HostLayout
 	// SourcePortStart is the inclusive start of the range of source ports
 	// to which the matcher applies.
 	SourcePortStart uint16
@@ -679,6 +704,7 @@ const (
 //
 // +marshal
 type IPTOwnerInfo struct {
+	_ structs.HostLayout
 	// UID is user id which created the packet.
 	UID uint32

@@ -711,6 +737,7 @@ const SizeOfIPTOwnerInfo = 34
 //
 // +marshal
 type XTOwnerMatchInfo struct {
+	_      structs.HostLayout
 	UIDMin uint32
 	UIDMax uint32
 	GIDMin uint32
@@ -753,6 +780,7 @@ const (
 //
 // +marshal
 type XTMultiport struct {
+	_ structs.HostLayout
 	// Flags indicates whether the match applies to
 	// source ports, destination ports, or either, as
 	// defined by "enum xt_multiport_flags".
@@ -774,6 +802,7 @@ type XTMultiport struct {
 //
 // +marshal
 type XTMultiportV1 struct {
+	_ structs.HostLayout
 	// Fields same as "XTMultiport".
 	Flags uint8
 	Count uint8
@@ -16,6 +16,7 @@ package linux

 import (
 	"math"
+	"structs"

 	"gvisor.dev/gvisor/pkg/marshal"
 	"gvisor.dev/gvisor/pkg/marshal/primitive"
@@ -69,6 +70,7 @@ const IP6T_ORIGINAL_DST = 80
 //
 // +marshal
 type IP6TReplace struct {
+	_           structs.HostLayout
 	Name        TableName
 	ValidHooks  uint32
 	NumEntries  uint32
@@ -90,8 +92,9 @@ const SizeOfIP6TReplace = 96
 //
 // +marshal dynamic
 type KernelIP6TGetEntries struct {
+	_ structs.HostLayout
 	IPTGetEntries
-	Entrytable []KernelIP6TEntry
+	Entrytable []KernelIP6TEntry `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -128,6 +131,7 @@ var _ marshal.Marshallable = (*KernelIP6TGetEntries)(nil)
 //
 // +marshal
 type IP6TEntry struct {
+	_ structs.HostLayout
 	// IPv6 is used to filter packets based on the IPv6 header.
 	IPv6 IP6TIP

@@ -169,13 +173,14 @@ const SizeOfIP6TEntry = 168
 //
 // +marshal dynamic
 type KernelIP6TEntry struct {
+	_     structs.HostLayout
 	Entry IP6TEntry

 	// Elems holds the data for all this rule's matches followed by the
 	// target. It is variable length -- users have to iterate over any
 	// matches and use TargetOffset and NextOffset to make sense of the
 	// data.
-	Elems primitive.ByteSlice
+	Elems primitive.ByteSlice `hostlayout:"ignore"`
 }

 // SizeBytes implements marshal.Marshallable.SizeBytes.
@@ -203,6 +208,7 @@ var _ marshal.Marshallable = (*KernelIP6TEntry)(nil)
 //
 // +marshal
 type IP6TIP struct {
+	_ structs.HostLayout
 	// Src is the source IP address.
 	Src Inet6Addr

@@ -286,6 +292,7 @@ const (
 //
 // +marshal
 type NFNATRange struct {
+	_        structs.HostLayout
 	Flags    uint32
 	MinAddr  Inet6Addr
 	MaxAddr  Inet6Addr
@@ -301,6 +308,7 @@ const SizeOfNFNATRange = 40
 //
 // +marshal
 type NFNATRange2 struct {
+	_         structs.HostLayout
 	Flags     uint32
 	MinAddr   Inet6Addr
 	MaxAddr   Inet6Addr
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Netlink protocols, from uapi/linux/netlink.h.
 const (
 	NETLINK_ROUTE          = 0
@@ -43,6 +47,7 @@ const (
 //
 // +marshal
 type SockAddrNetlink struct {
+	_      structs.HostLayout
 	Family uint16
 	_      uint16
 	PortID uint32
@@ -56,6 +61,7 @@ const SockAddrNetlinkSize = 12
 //
 // +marshal
 type NetlinkMessageHeader struct {
+	_      structs.HostLayout
 	Length uint32
 	Type   uint16
 	Flags  uint16
@@ -118,6 +124,7 @@ const NLMSG_ALIGNTO = 4
 //
 // +marshal
 type NetlinkAttrHeader struct {
+	_      structs.HostLayout
 	Length uint16
 	Type   uint16
 }
@@ -181,6 +188,7 @@ const (
 //
 // +marshal
 type NetlinkErrorMessage struct {
+	_      structs.HostLayout
 	Error  int32
 	Header NetlinkMessageHeader
 }
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Group describes Netlink Netfilter groups, from uapi/linux/netfilter/nfnetlink.h.
 // Users bind to specific groups to receive processing logs from those groups.
 type Group uint16
@@ -38,6 +42,7 @@ const (
 //
 // +marshal
 type NetFilterGenMsg struct {
+	_          structs.HostLayout
 	Family     uint8
 	Version    uint8
 	ResourceID uint16
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Netlink message types for NETLINK_ROUTE sockets, from uapi/linux/rtnetlink.h.
 const (
 	RTM_NEWLINK = 16
@@ -88,6 +92,7 @@ const (
 //
 // +marshal
 type InterfaceInfoMessage struct {
+	_      structs.HostLayout
 	Family uint8
 	_      uint8
 	Type   uint16
@@ -187,6 +192,7 @@ const (
 //
 // +marshal
 type InterfaceAddrMessage struct {
+	_         structs.HostLayout
 	Family    uint8
 	PrefixLen uint8
 	Flags     uint8
@@ -221,6 +227,7 @@ const (
 //
 // +marshal
 type RouteMessage struct {
+	_      structs.HostLayout
 	Family uint8
 	DstLen uint8
 	SrcLen uint8
@@ -369,6 +376,7 @@ const (
 //
 // +marshal
 type RtAttr struct {
+	_    structs.HostLayout
 	Len  uint16
 	Type uint16
 }
@@ -14,10 +14,15 @@

 package linux

+import (
+	"structs"
+)
+
 // PollFD is struct pollfd, used by poll(2)/ppoll(2), from uapi/asm-generic/poll.h.
 //
 // +marshal slice:PollFDSlice
 type PollFD struct {
+	_       structs.HostLayout
 	FD      int32
 	Events  int16
 	REvents int16
@@ -17,12 +17,17 @@

 package linux

+import (
+	"structs"
+)
+
 // PtraceRegs is the set of CPU registers exposed by ptrace. Source:
 // syscall.PtraceRegs.
 //
 // +marshal
 // +stateify savable
 type PtraceRegs struct {
+	_        structs.HostLayout
 	R15      uint64
 	R14      uint64
 	R13      uint64
@@ -17,6 +17,10 @@

 package linux

+import (
+	"structs"
+)
+
 const (
 	//PSR bits
 	PSR_MODE_EL0t = 0x00000000
@@ -54,6 +58,7 @@ const (
 // +marshal
 // +stateify savable
 type PtraceRegs struct {
+	_      structs.HostLayout
 	Regs   [31]uint64
 	Sp     uint64
 	Pc     uint64
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Flags passed to rseq(2).
 //
 // Defined in include/uapi/linux/rseq.h.
@@ -45,6 +49,7 @@ const (
 //
 // +marshal
 type RSeqCriticalSection struct {
+	_ structs.HostLayout
 	// Version is the version of this structure. Version 0 is defined here.
 	Version uint32

@@ -88,6 +93,7 @@ const (
 //
 // In userspace, this structure is always aligned to 32 bytes.
 type RSeq struct {
+	_ structs.HostLayout
 	// CPUIDStart contains the current CPU ID if rseq is initialized.
 	//
 	// This field should only be read by the thread which registered this
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // Flags that may be used with wait4(2) and getrusage(2).
 const (
 	// wait4(2) uses this to aggregate RUSAGE_SELF and RUSAGE_CHILDREN.
@@ -29,6 +33,7 @@ const (
 //
 // +marshal
 type Rusage struct {
+	_        structs.HostLayout
 	UTime    Timeval
 	STime    Timeval
 	MaxRSS   int64
@@ -14,7 +14,10 @@

 package linux

-import "fmt"
+import (
+	"fmt"
+	"structs"
+)

 // Seccomp constants taken from <linux/seccomp.h>.
 const (
@@ -103,6 +106,7 @@ func (a BPFAction) WithReturnCode(code uint16) BPFAction {

 // SockFprog is sock_fprog taken from <linux/filter.h>.
 type SockFprog struct {
+	_      structs.HostLayout
 	Len    uint16
 	pad    [6]byte
 	Filter *BPFInstruction
@@ -113,6 +117,7 @@ type SockFprog struct {
 //
 // +marshal
 type SeccompData struct {
+	_ structs.HostLayout
 	// Nr is the system call number.
 	Nr int32

@@ -131,6 +136,7 @@ type SeccompData struct {
 //
 // +marshal
 type SeccompNotifResp struct {
+	_     structs.HostLayout
 	ID    uint64
 	Val   int64
 	Error int32
@@ -141,6 +147,7 @@ type SeccompNotifResp struct {
 //
 // +marshal
 type SeccompNotifSizes struct {
+	_          structs.HostLayout
 	Notif      uint16
 	Notif_resp uint16
 	Data       uint16
@@ -150,6 +157,7 @@ type SeccompNotifSizes struct {
 //
 // +marshal
 type SeccompNotif struct {
+	_     structs.HostLayout
 	ID    uint64
 	Pid   int32
 	Flags uint32
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 // semctl Command Definitions. Source: include/uapi/linux/sem.h
 const (
 	GETPID  = 11
@@ -58,6 +62,7 @@ const (
 //
 // +marshal slice:SembufSlice
 type Sembuf struct {
+	_      structs.HostLayout
 	SemNum uint16
 	SemOp  int16
 	SemFlg int16
@@ -69,6 +74,7 @@ type Sembuf struct {
 //
 // +marshal
 type SemInfo struct {
+	_      structs.HostLayout
 	SemMap uint32
 	SemMni uint32
 	SemMns uint32
@@ -17,12 +17,17 @@

 package linux

+import (
+	"structs"
+)
+
 // SemidDS is equivalent to struct semid64_ds.
 //
 // Source: arch/x86/include/uapi/asm/sembuf.h
 //
 // +marshal
 type SemidDS struct {
+	_        structs.HostLayout
 	SemPerm  IPCPerm
 	SemOTime TimeT
 	unused1  uint64
@@ -17,12 +17,17 @@

 package linux

+import (
+	"structs"
+)
+
 // SemidDS is equivalent to struct semid64_ds.
 //
 // Source: include/uapi/asm-generic/sembuf.h
 //
 // +marshal
 type SemidDS struct {
+	_        structs.HostLayout
 	SemPerm  IPCPerm
 	SemOTime TimeT
 	SemCTime TimeT
@@ -14,7 +14,10 @@

 package linux

-import "math"
+import (
+	"math"
+	"structs"
+)

 // shmat(2) flags. Source: include/uapi/linux/shm.h
 const (
@@ -54,6 +57,7 @@ const (
 //
 // +marshal
 type ShmidDS struct {
+	_          structs.HostLayout
 	ShmPerm    IPCPerm
 	ShmSegsz   uint64
 	ShmAtime   TimeT
@@ -71,6 +75,7 @@ type ShmidDS struct {
 //
 // +marshal
 type ShmParams struct {
+	_      structs.HostLayout
 	ShmMax uint64
 	ShmMin uint64
 	ShmMni uint64
@@ -82,6 +87,7 @@ type ShmParams struct {
 //
 // +marshal
 type ShmInfo struct {
+	_             structs.HostLayout
 	UsedIDs       int32 // Number of currently existing segments.
 	_             [4]byte
 	ShmTot        uint64 // Total number of shared memory pages.
@@ -15,6 +15,8 @@
 package linux

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/bits"
 	"gvisor.dev/gvisor/pkg/hostarch"
 )
@@ -291,6 +293,7 @@ const (
 //
 // +marshal
 type Sigevent struct {
+	_      structs.HostLayout
 	Value  uint64 // union sigval {int, void*}
 	Signo  int32
 	Notify int32
@@ -306,6 +309,7 @@ type Sigevent struct {
 // +marshal
 // +stateify savable
 type SigAction struct {
+	_        structs.HostLayout
 	Handler  uint64
 	Flags    uint64
 	Restorer uint64
@@ -318,6 +322,7 @@ type SigAction struct {
 // +marshal
 // +stateify savable
 type SignalStack struct {
+	_     structs.HostLayout
 	Addr  uint64
 	Flags uint32
 	_     uint32
@@ -345,6 +350,7 @@ func (s *SignalStack) IsEnabled() bool {
 // +marshal
 // +stateify savable
 type SignalInfo struct {
+	_     structs.HostLayout
 	Signo int32 // Signal number
 	Errno int32 // Errno value
 	Code  int32 // Signal code
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 const (
 	// SFD_NONBLOCK is a signalfd(2) flag.
 	SFD_NONBLOCK = 00004000
@@ -26,6 +30,7 @@ const (
 //
 // +marshal
 type SignalfdSiginfo struct {
+	_       structs.HostLayout
 	Signo   uint32
 	Errno   int32
 	Code    int32
@@ -15,6 +15,8 @@
 package linux

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/marshal"
 )

@@ -174,6 +176,7 @@ const (
 //
 // +marshal
 type TpacketReq struct {
+	_           structs.HostLayout
 	TpBlockSize uint32
 	TpBlockNr   uint32
 	TpFrameSize uint32
@@ -185,6 +188,7 @@ type TpacketReq struct {
 //
 // +marshal
 type TpacketHdr struct {
+	_         structs.HostLayout
 	TpStatus  uint64
 	TpLen     uint32
 	TpSnaplen uint32
@@ -200,6 +204,7 @@ type TpacketHdr struct {
 //
 // +marshal
 type Tpacket2Hdr struct {
+	_          structs.HostLayout
 	TpStatus   uint32
 	TpLen      uint32
 	TpSnaplen  uint32
@@ -217,6 +222,7 @@ type Tpacket2Hdr struct {
 //
 // +marshal
 type TpacketStats struct {
+	_       structs.HostLayout
 	Packets uint32
 	Dropped uint32
 }
@@ -373,6 +379,7 @@ var SizeOfInetAddr = uint32((*InetAddr)(nil).SizeBytes())
 //
 // +marshal
 type SockAddrInet struct {
+	_      structs.HostLayout
 	Family uint16
 	Port   uint16
 	Addr   InetAddr
@@ -383,6 +390,7 @@ type SockAddrInet struct {
 //
 // +marshal
 type Inet6MulticastRequest struct {
+	_              structs.HostLayout
 	MulticastAddr  Inet6Addr
 	InterfaceIndex int32
 }
@@ -391,6 +399,7 @@ type Inet6MulticastRequest struct {
 //
 // +marshal
 type InetMulticastRequest struct {
+	_             structs.HostLayout
 	MulticastAddr InetAddr
 	InterfaceAddr InetAddr
 }
@@ -399,6 +408,7 @@ type InetMulticastRequest struct {
 //
 // +marshal
 type InetMulticastRequestWithNIC struct {
+	_ structs.HostLayout
 	InetMulticastRequest
 	InterfaceIndex int32
 }
@@ -412,6 +422,7 @@ type Inet6Addr [16]byte
 //
 // +marshal
 type SockAddrInet6 struct {
+	_        structs.HostLayout
 	Family   uint16
 	Port     uint16
 	Flowinfo uint32
@@ -423,6 +434,7 @@ type SockAddrInet6 struct {
 //
 // +marshal
 type SockAddrLink struct {
+	_               structs.HostLayout
 	Family          uint16
 	Protocol        uint16
 	InterfaceIndex  int32
@@ -441,6 +453,7 @@ const UnixPathMax = 108
 //
 // +marshal
 type SockAddrUnix struct {
+	_      structs.HostLayout
 	Family uint16
 	Path   [UnixPathMax]int8
 }
@@ -466,6 +479,7 @@ func (s *SockAddrNetlink) implementsSockAddr() {}
 //
 // +marshal
 type Linger struct {
+	_      structs.HostLayout
 	OnOff  int32
 	Linger int32
 }
@@ -482,6 +496,7 @@ const SizeOfLinger = 8
 //
 // +marshal
 type TCPInfo struct {
+	_ structs.HostLayout
 	// State is the state of the connection.
 	State uint8

@@ -640,6 +655,7 @@ const (
 //
 // +marshal
 type ControlMessageHeader struct {
+	_      structs.HostLayout
 	Length uint64
 	Level  int32
 	Type   int32
@@ -655,6 +671,7 @@ var SizeOfControlMessageHeader = (*ControlMessageHeader)(nil).SizeBytes()
 //
 // +marshal
 type ControlMessageCredentials struct {
+	_   structs.HostLayout
 	PID int32
 	UID uint32
 	GID uint32
@@ -667,6 +684,7 @@ type ControlMessageCredentials struct {
 // +marshal
 // +stateify savable
 type ControlMessageIPPacketInfo struct {
+	_               structs.HostLayout
 	NIC             int32
 	LocalAddr       InetAddr
 	DestinationAddr InetAddr
@@ -677,6 +695,7 @@ type ControlMessageIPPacketInfo struct {
 // +marshal
 // +stateify savable
 type ControlMessageIPv6PacketInfo struct {
+	_    structs.HostLayout
 	Addr Inet6Addr
 	NIC  uint32
 }
@@ -728,6 +747,7 @@ const SO_ACCEPTCON = 1 << 16
 // +marshal
 // +stateify savable
 type ICMP6Filter struct {
+	_      structs.HostLayout
 	Filter [8]uint32
 }

@@ -16,6 +16,7 @@ package linux

 import (
 	"math"
+	"structs"
 	"time"
 )

@@ -106,6 +107,7 @@ func NsecToTimeT(nsec int64) TimeT {
 //
 // +marshal slice:TimespecSlice
 type Timespec struct {
+	_    structs.HostLayout
 	Sec  int64
 	Nsec int64
 }
@@ -162,6 +164,7 @@ const SizeOfTimeval = 16
 //
 // +marshal slice:TimevalSlice
 type Timeval struct {
+	_    structs.HostLayout
 	Sec  int64
 	Usec int64
 }
@@ -201,6 +204,7 @@ func DurationToTimeval(dur time.Duration) Timeval {
 //
 // +marshal
 type Itimerspec struct {
+	_        structs.HostLayout
 	Interval Timespec
 	Value    Timespec
 }
@@ -214,6 +218,7 @@ type Itimerspec struct {
 //
 // +marshal
 type ItimerVal struct {
+	_        structs.HostLayout
 	Interval Timeval
 	Value    Timeval
 }
@@ -232,6 +237,7 @@ func ClockTFromDuration(d time.Duration) ClockT {
 //
 // +marshal
 type Tms struct {
+	_      structs.HostLayout
 	UTime  ClockT
 	STime  ClockT
 	CUTime ClockT
@@ -248,6 +254,7 @@ type TimerID int32
 //
 // +marshal
 type StatxTimestamp struct {
+	_    structs.HostLayout
 	Sec  int64
 	Nsec uint32
 	_    int32
@@ -283,6 +290,7 @@ func (sxts StatxTimestamp) ToTime() time.Time {
 //
 // +marshal
 type Utime struct {
+	_       structs.HostLayout
 	Actime  int64
 	Modtime int64
 }
@@ -14,6 +14,10 @@

 package linux

+import (
+	"structs"
+)
+
 const (
 	// NumControlCharacters is the number of control characters in Termios.
 	NumControlCharacters = 19
@@ -26,6 +30,7 @@ const (
 //
 // +marshal
 type Winsize struct {
+	_      structs.HostLayout
 	Row    uint16
 	Col    uint16
 	Xpixel uint16
@@ -36,6 +41,7 @@ type Winsize struct {
 //
 // +marshal
 type Termios struct {
+	_                 structs.HostLayout
 	InputFlags        uint32
 	OutputFlags       uint32
 	ControlFlags      uint32
@@ -49,6 +55,7 @@ type Termios struct {
 //
 // +stateify savable
 type KernelTermios struct {
+	_                 structs.HostLayout
 	InputFlags        uint32
 	OutputFlags       uint32
 	ControlFlags      uint32
@@ -343,6 +350,7 @@ var DefaultReplicaTermios = KernelTermios{
 // +stateify savable
 // +marshal
 type WindowSize struct {
+	_    structs.HostLayout
 	Rows uint16
 	Cols uint16
 	_    [4]byte // Padding for 2 unused shorts.
@@ -17,6 +17,7 @@ package linux
 import (
 	"bytes"
 	"fmt"
+	"structs"
 )

 const (
@@ -29,6 +30,7 @@ const (
 //
 // +marshal
 type UtsName struct {
+	_          structs.HostLayout
 	Sysname    [UTSLen + 1]byte
 	Nodename   [UTSLen + 1]byte
 	Release    [UTSLen + 1]byte
@@ -16,6 +16,10 @@

 package linux

+import (
+	"structs"
+)
+
 // For IOCTLs requests from include/uapi/linux/vfio.h.
 const (
 	VFIO_TYPE = ';'
@@ -131,6 +135,7 @@ var (
 //
 // +marshal
 type VFIODeviceInfo struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	// The total amount of regions.
@@ -147,6 +152,7 @@ type VFIODeviceInfo struct {
 //
 // +marshal
 type VFIORegionInfo struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	Index uint32
@@ -163,6 +169,7 @@ type VFIORegionInfo struct {
 //
 // +marshal
 type VFIOIrqInfo struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	Index uint32
@@ -176,6 +183,7 @@ type VFIOIrqInfo struct {
 //
 // +marshal
 type VFIOIrqSet struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	Index uint32
@@ -188,6 +196,7 @@ type VFIOIrqSet struct {
 //
 // +marshal
 type VFIOIommuType1DmaMap struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	// Process virtual address.
@@ -203,6 +212,7 @@ type VFIOIommuType1DmaMap struct {
 //
 // +marshal
 type VFIOIommuType1DmaUnmap struct {
+	_     structs.HostLayout
 	Argsz uint32
 	Flags uint32
 	// IO virtual address.
@@ -15,6 +15,7 @@ go_library(
        "status.go",
        "uvm.go",
    ],
+    hostlayout = True,
    marshal = True,
    visibility = [
        "//pkg/sentry:internal",
@@ -16,6 +16,7 @@ package nvgpu

 import (
 	"fmt"
+	"structs"
 )

 // ClassID is a client class ID, in the sense of
@@ -132,6 +133,7 @@ const (
 //
 // +marshal
 type NV2081_ALLOC_PARAMETERS struct {
+	_        structs.HostLayout
 	Reserved uint32
 }

@@ -140,6 +142,7 @@ type NV2081_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV0005_ALLOC_PARAMETERS struct {
+	_             structs.HostLayout
 	HParentClient Handle
 	HSrcResource  Handle
 	HClass        ClassID
@@ -162,6 +165,7 @@ const (
 //
 // +marshal
 type NV_MEMORY_VIRTUAL_ALLOCATION_PARAMS struct {
+	_        structs.HostLayout
 	Offset   uint64
 	Limit    uint64
 	HVASpace Handle
@@ -178,6 +182,7 @@ const (
 //
 // +marshal
 type NV0080_ALLOC_PARAMETERS struct {
+	_               structs.HostLayout
 	DeviceID        uint32
 	HClientShare    Handle
 	HTargetClient   Handle
@@ -196,6 +201,7 @@ type NV0080_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV_SEMAPHORE_SURFACE_ALLOC_PARAMETERS struct {
+	_                structs.HostLayout
 	HSemaphoreMem    Handle
 	HMaxSubmittedMem Handle
 	flags            uint64
@@ -206,6 +212,7 @@ type NV_SEMAPHORE_SURFACE_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV2080_ALLOC_PARAMETERS struct {
+	_           structs.HostLayout
 	SubDeviceID uint32
 }

@@ -214,6 +221,7 @@ type NV2080_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV_CONTEXT_DMA_ALLOCATION_PARAMS struct {
+	_          structs.HostLayout
 	HSubDevice Handle
 	Flags      uint32
 	HMemory    Handle
@@ -227,6 +235,7 @@ type NV_CONTEXT_DMA_ALLOCATION_PARAMS struct {
 //
 // +marshal
 type NV_MEMORY_ALLOCATION_PARAMS struct {
+	_             structs.HostLayout
 	Owner         uint32
 	Type          uint32
 	Flags         uint32
@@ -257,6 +266,7 @@ type NV_MEMORY_ALLOCATION_PARAMS struct {
 //
 // +marshal
 type NV_MEMORY_ALLOCATION_PARAMS_V545 struct {
+	_ structs.HostLayout
 	NV_MEMORY_ALLOCATION_PARAMS
 	NumaNode int32
 	_        uint32
@@ -266,6 +276,7 @@ type NV_MEMORY_ALLOCATION_PARAMS_V545 struct {
 //
 // +marshal
 type NV503B_BAR1_P2P_DMA_INFO struct {
+	_          structs.HostLayout
 	DmaAddress uint64
 	DmaSize    uint64
 }
@@ -275,6 +286,7 @@ type NV503B_BAR1_P2P_DMA_INFO struct {
 //
 // +marshal
 type NV503B_ALLOC_PARAMETERS struct {
+	_                          structs.HostLayout
 	HSubDevice                 Handle
 	HPeerSubDevice             Handle
 	SubDevicePeerIDMask        uint32
@@ -293,6 +305,7 @@ type NV503B_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV503C_ALLOC_PARAMETERS struct {
+	_     structs.HostLayout
 	Flags uint32
 }

@@ -301,6 +314,7 @@ type NV503C_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV83DE_ALLOC_PARAMETERS struct {
+	_                        structs.HostLayout
 	HDebuggerClient_Obsolete Handle
 	HAppClient               Handle
 	HClass3DObject           Handle
@@ -311,6 +325,7 @@ type NV83DE_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV_CTXSHARE_ALLOCATION_PARAMETERS struct {
+	_        structs.HostLayout
 	HVASpace Handle
 	Flags    uint32
 	SubctxID uint32
@@ -321,6 +336,7 @@ type NV_CTXSHARE_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_VASPACE_ALLOCATION_PARAMETERS struct {
+	_               structs.HostLayout
 	Index           uint32
 	Flags           uint32
 	VASize          uint64
@@ -336,6 +352,7 @@ type NV_VASPACE_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_VASPACE_ALLOCATION_PARAMETERS_V580 struct {
+	_ structs.HostLayout
 	NV_VASPACE_ALLOCATION_PARAMETERS
 	Pasid uint32
 	Pad1  [4]byte
@@ -346,6 +363,7 @@ type NV_VASPACE_ALLOCATION_PARAMETERS_V580 struct {
 //
 // +marshal
 type NV_CHANNEL_GROUP_ALLOCATION_PARAMETERS struct {
+	_                           structs.HostLayout
 	HObjectError                Handle
 	HObjectECCError             Handle
 	HVASpace                    Handle
@@ -359,6 +377,7 @@ type NV_CHANNEL_GROUP_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_MEMORY_DESC_PARAMS struct {
+	_            structs.HostLayout
 	Base         uint64
 	Size         uint64
 	AddressSpace uint32
@@ -370,6 +389,7 @@ type NV_MEMORY_DESC_PARAMS struct {
 //
 // +marshal
 type NV_BSP_ALLOCATION_PARAMETERS struct {
+	_                         structs.HostLayout
 	Size                      uint32
 	ProhibitMultipleInstances uint32
 	EngineInstance            uint32
@@ -380,6 +400,7 @@ type NV_BSP_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_MSENC_ALLOCATION_PARAMETERS struct {
+	_                         structs.HostLayout
 	Size                      uint32
 	ProhibitMultipleInstances uint32
 	EngineInstance            uint32
@@ -391,6 +412,7 @@ type NV_MSENC_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_CHANNEL_ALLOC_PARAMS struct {
+	_                   structs.HostLayout
 	HObjectError        Handle
 	HObjectBuffer       Handle
 	GPFIFOOffset        uint64
@@ -424,6 +446,7 @@ type NV_CHANNEL_ALLOC_PARAMS struct {
 //
 // +marshal
 type NV_CHANNEL_ALLOC_PARAMS_V570 struct {
+	_ structs.HostLayout
 	NV_CHANNEL_ALLOC_PARAMS
 	TPCConfigID uint32
 	_           uint32
@@ -435,6 +458,7 @@ type NV_CHANNEL_ALLOC_PARAMS_V570 struct {
 //
 // +marshal
 type NVB0B5_ALLOCATION_PARAMETERS struct {
+	_          structs.HostLayout
 	Version    uint32
 	EngineType uint32
 }
@@ -444,6 +468,7 @@ type NVB0B5_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_GR_ALLOCATION_PARAMETERS struct {
+	_       structs.HostLayout
 	Version uint32
 	Flags   uint32
 	Size    uint32
@@ -455,6 +480,7 @@ type NV_GR_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV_HOPPER_USERMODE_A_PARAMS struct {
+	_           structs.HostLayout
 	Bar1Mapping uint8
 	Priv        uint8
 }
@@ -464,6 +490,7 @@ type NV_HOPPER_USERMODE_A_PARAMS struct {
 //
 // +marshal
 type NV9072_ALLOCATION_PARAMETERS struct {
+	_             structs.HostLayout
 	LogicalHeadID uint32
 	DisplayMask   uint32
 	Caps          uint32
@@ -474,6 +501,7 @@ type NV9072_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00DE_ALLOC_PARAMETERS struct {
+	_        structs.HostLayout
 	Reserved uint32
 }

@@ -482,11 +510,13 @@ type NV00DE_ALLOC_PARAMETERS struct {
 //
 // +marshal
 type NV00DE_ALLOC_PARAMETERS_V545 struct {
+	_              structs.HostLayout
 	PolledDataMask uint64
 }

 // +marshal
 type nv00f8Map struct {
+	_       structs.HostLayout
 	offset  uint64
 	hVidMem Handle
 	flags   uint32
@@ -503,6 +533,7 @@ const (
 //
 // +marshal
 type NV_EXPORT_MEM_PACKET struct {
+	_      structs.HostLayout
 	UUID   [NV_MEM_EXPORT_UUID_LEN]uint8
 	Opaque [16]uint8
 }
@@ -512,6 +543,7 @@ type NV_EXPORT_MEM_PACKET struct {
 //
 // +marshal
 type NV00E0_ALLOCATION_PARAMETERS struct {
+	_                  structs.HostLayout
 	IMEXChannel        uint32
 	Packet             NV_EXPORT_MEM_PACKET
 	NumMaxHandles      uint16
@@ -529,6 +561,7 @@ type NV00E0_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00F1_ALLOCATION_PARAMETERS struct {
+	_             structs.HostLayout
 	CapDescriptor uint64
 	Flags         uint32
 	Pad0          [4]byte
@@ -546,6 +579,7 @@ type NV00F1_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00F8_ALLOCATION_PARAMETERS struct {
+	_          structs.HostLayout
 	Alignment  uint64
 	AllocSize  uint64
 	PageSize   uint64
@@ -560,6 +594,7 @@ type NV00F8_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00FB_ALLOCATION_PARAMETERS struct {
+	_          structs.HostLayout
 	ExportUUID [NV_MEM_EXPORT_UUID_LEN]uint8
 	Index      uint16
 	Pad0       [2]byte
@@ -572,6 +607,7 @@ type NV00FB_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00FD_ALLOCATION_PARAMETERS struct {
+	_          structs.HostLayout
 	Alignment  uint64
 	AllocSize  uint64
 	PageSize   uint32
@@ -586,6 +622,7 @@ type NV00FD_ALLOCATION_PARAMETERS struct {
 //
 // +marshal
 type NV00FD_ALLOCATION_PARAMETERS_V545 struct {
+	_         structs.HostLayout
 	ExpPacket NV_EXPORT_MEM_PACKET
 	Index     uint16
 	_         [6]byte
@@ -597,6 +634,7 @@ type NV00FD_ALLOCATION_PARAMETERS_V545 struct {
 //
 // +marshal
 type NV_MEMORY_MAPPER_ALLOCATION_PARAMS struct {
+	_      structs.HostLayout
 	unused uint8
 }

@@ -605,6 +643,7 @@ type NV_MEMORY_MAPPER_ALLOCATION_PARAMS struct {
 //
 // +marshal
 type NV_MEMORY_MAPPER_ALLOCATION_PARAMS_V550 struct {
+	_                 structs.HostLayout
 	HSemaphoreSurface Handle
 	MaxQueueSize      uint32
 }
@@ -614,6 +653,7 @@ type NV_MEMORY_MAPPER_ALLOCATION_PARAMS_V550 struct {
 //
 // +marshal
 type NV_MEMORY_MAPPER_ALLOCATION_PARAMS_V555 struct {
+	_ structs.HostLayout
 	NV_MEMORY_MAPPER_ALLOCATION_PARAMS_V550
 	HNotificationMemory Handle
 	_                   uint32
@@ -625,6 +665,7 @@ type NV_MEMORY_MAPPER_ALLOCATION_PARAMS_V555 struct {
 //
 // +marshal
 type NV_CONFIDENTIAL_COMPUTE_ALLOC_PARAMS struct {
+	_      structs.HostLayout
 	Handle Handle
 }

@@ -633,6 +674,7 @@ type NV_CONFIDENTIAL_COMPUTE_ALLOC_PARAMS struct {
 //
 // +marshal
 type NVA0BC_ALLOC_PARAMETERS struct {
+	_           structs.HostLayout
 	CodecType   uint32
 	HResolution uint32
 	VResolution uint32
@@ -14,6 +14,10 @@

 package nvgpu

+import (
+	"structs"
+)
+
 // From src/nvidia/interface/deprecated/rmapi_deprecated.h:
 const (
 	RM_GSS_LEGACY_MASK = 0x00008000
@@ -38,6 +42,7 @@ const (
 //
 // +marshal
 type NVXXXX_CTRL_XXX_INFO struct {
+	_     structs.HostLayout
 	Index uint32
 	Data  uint32
 }
@@ -86,6 +91,7 @@ const (
 //
 // +marshal
 type NV0000_CTRL_GPU_GET_ID_INFO_PARAMS struct {
+	_                 structs.HostLayout
 	GpuID             uint32
 	GpuFlags          uint32
 	DeviceInstance    uint32
@@ -99,12 +105,14 @@ type NV0000_CTRL_GPU_GET_ID_INFO_PARAMS struct {

 // +marshal
 type NV0000_CTRL_GPU_ATTACH_IDS_PARAMS struct {
+	_        structs.HostLayout
 	GPUIDs   [NV0000_CTRL_GPU_MAX_PROBED_GPUS]uint32
 	FailedID uint32
 }

 // +marshal
 type NV0000_CTRL_GPU_GET_UUID_FROM_GPU_ID_PARAMS struct {
+	_          structs.HostLayout
 	GPUID      uint32
 	Flags      uint32
 	GPUUUID    [NV0000_GPU_MAX_GID_LENGTH]byte
@@ -139,6 +147,7 @@ const (
 //
 // +marshal
 type NV0000_CTRL_SYSTEM_GET_P2P_CAPS_PARAMS struct {
+	_                  structs.HostLayout
 	GpuIDs             [NV0000_CTRL_SYSTEM_MAX_ATTACHED_GPUS]uint32
 	GpuCount           uint32
 	P2PCaps            uint32
@@ -154,6 +163,7 @@ type NV0000_CTRL_SYSTEM_GET_P2P_CAPS_PARAMS struct {
 //
 // +marshal
 type NV0000_CTRL_SYSTEM_GET_P2P_CAPS_PARAMS_V550 struct {
+	_ structs.HostLayout
 	NV0000_CTRL_SYSTEM_GET_P2P_CAPS_PARAMS
 	BusEgmPeerIDs P64
 }
@@ -172,6 +182,7 @@ const (

 // +marshal
 type NV0000_CTRL_OS_UNIX_GET_EXPORT_OBJECT_INFO_PARAMS struct {
+	_              structs.HostLayout
 	FD             int32
 	DeviceInstance uint32
 	MaxObjects     uint16
@@ -191,6 +202,7 @@ func (p *NV0000_CTRL_OS_UNIX_GET_EXPORT_OBJECT_INFO_PARAMS) SetFrontendFD(fd int

 // +marshal
 type NV0000_CTRL_OS_UNIX_GET_EXPORT_OBJECT_INFO_PARAMS_V545 struct {
+	_              structs.HostLayout
 	FD             int32
 	DeviceInstance uint32
 	GpuInstanceID  uint32
@@ -211,12 +223,14 @@ func (p *NV0000_CTRL_OS_UNIX_GET_EXPORT_OBJECT_INFO_PARAMS_V545) SetFrontendFD(f

 // +marshal
 type NV0000_CTRL_OS_UNIX_EXPORT_OBJECT struct {
+	_    structs.HostLayout
 	Type uint32   // enum NV0000_CTRL_OS_UNIX_EXPORT_OBJECT_TYPE
 	Data [12]byte // union
 }

 // +marshal
 type NV0000_CTRL_OS_UNIX_EXPORT_OBJECT_TO_FD_PARAMS struct {
+	_      structs.HostLayout
 	Object NV0000_CTRL_OS_UNIX_EXPORT_OBJECT
 	FD     int32
 	Flags  uint32
@@ -234,6 +248,7 @@ func (p *NV0000_CTRL_OS_UNIX_EXPORT_OBJECT_TO_FD_PARAMS) SetFrontendFD(fd int32)

 // +marshal
 type NV0000_CTRL_OS_UNIX_IMPORT_OBJECT_FROM_FD_PARAMS struct {
+	_      structs.HostLayout
 	FD     int32
 	Object NV0000_CTRL_OS_UNIX_EXPORT_OBJECT
 }
@@ -250,6 +265,7 @@ func (p *NV0000_CTRL_OS_UNIX_IMPORT_OBJECT_FROM_FD_PARAMS) SetFrontendFD(fd int3

 // +marshal
 type NV0000_CTRL_OS_UNIX_EXPORT_OBJECTS_TO_FD_PARAMS struct {
+	_          structs.HostLayout
 	FD         int32
 	HDevice    Handle
 	MaxObjects uint16
@@ -272,6 +288,7 @@ func (p *NV0000_CTRL_OS_UNIX_EXPORT_OBJECTS_TO_FD_PARAMS) SetFrontendFD(fd int32

 // +marshal
 type NV0000_CTRL_OS_UNIX_IMPORT_OBJECTS_FROM_FD_PARAMS struct {
+	_           structs.HostLayout
 	FD          int32
 	HParent     Handle
 	Objects     [NV0000_CTRL_OS_UNIX_IMPORT_OBJECTS_TO_FD_MAX_OBJECTS]Handle
@@ -292,6 +309,7 @@ func (p *NV0000_CTRL_OS_UNIX_IMPORT_OBJECTS_FROM_FD_PARAMS) SetFrontendFD(fd int

 // +marshal
 type NV0000_CTRL_SYSTEM_GET_BUILD_VERSION_PARAMS struct {
+	_                        structs.HostLayout
 	SizeOfStrings            uint32
 	Pad                      [4]byte
 	PDriverVersionBuffer     P64
@@ -328,6 +346,7 @@ const (

 // +marshal
 type NV0080_CTRL_FIFO_GET_CHANNELLIST_PARAMS struct {
+	_                  structs.HostLayout
 	NumChannels        uint32
 	Pad                [4]byte
 	PChannelHandleList P64
@@ -349,6 +368,7 @@ const (
 //
 // +marshal
 type RmapiParamNvU32List struct {
+	_        structs.HostLayout
 	NumElems uint32
 	Pad      [4]byte
 	List     P64
@@ -369,6 +389,7 @@ const (
 //
 // +marshal
 type NV0080_CTRL_GET_CAPS_PARAMS struct {
+	_           structs.HostLayout
 	CapsTblSize uint32
 	Pad         [4]byte
 	CapsTbl     P64
@@ -376,6 +397,7 @@ type NV0080_CTRL_GET_CAPS_PARAMS struct {

 // +marshal
 type NV0080_CTRL_GR_ROUTE_INFO struct {
+	_     structs.HostLayout
 	Flags uint32
 	Pad   [4]byte
 	Route uint64
@@ -391,6 +413,7 @@ const (
 //
 // +marshal
 type NV208F_CTRL_GPU_VERIFY_INFOROM_PARAMS struct {
+	_        structs.HostLayout
 	Result   uint32
 	Checksum uint32
 }
@@ -404,6 +427,7 @@ type NV208F_CTRL_GPU_VERIFY_INFOROM_PARAMS struct {
 //
 // +marshal
 type NvxxxCtrlXxxGetInfoParams struct {
+	_            structs.HostLayout
 	InfoListSize uint32
 	Pad          [4]byte
 	InfoList     P64
@@ -495,6 +519,7 @@ const (

 // +marshal
 type NV00FD_CTRL_ATTACH_GPU_PARAMS struct {
+	_             structs.HostLayout
 	HSubDevice    Handle
 	Flags         uint32
 	DevDescriptor uint64
@@ -554,6 +579,7 @@ const (

 // +marshal
 type NV2080_CTRL_FIFO_DISABLE_CHANNELS_PARAMS struct {
+	_                      structs.HostLayout
 	BDisable               uint8
 	Pad1                   [3]byte
 	NumChannels            uint32
@@ -619,6 +645,7 @@ const (

 // +marshal
 type NV2080_CTRL_GR_GET_INFO_PARAMS struct {
+	_ structs.HostLayout
 	NvxxxCtrlXxxGetInfoParams
 	GRRouteInfo NV0080_CTRL_GR_ROUTE_INFO
 }
@@ -690,6 +717,7 @@ const (

 // +marshal
 type NV503C_CTRL_REGISTER_VA_SPACE_PARAMS struct {
+	_            structs.HostLayout
 	HVASpace     Handle
 	Pad          [4]byte
 	VASpaceToken uint64
@@ -15,6 +15,8 @@
 package nvgpu

 import (
+	"structs"
+
 	"gvisor.dev/gvisor/pkg/marshal"
 )

@@ -64,6 +66,7 @@ const (
 //
 // +marshal
 type IoctlCardInfo struct {
+	_             structs.HostLayout
 	Valid         uint8
 	Pad0          [3]byte
 	PCIInfo       PCIInfo
@@ -83,6 +86,7 @@ type IoctlCardInfo struct {
 //
 // +marshal
 type PCIInfo struct {
+	_        structs.HostLayout
 	Domain   uint32
 	Bus      uint8
 	Slot     uint8
@@ -96,6 +100,7 @@ type PCIInfo struct {
 //
 // +marshal
 type IoctlRegisterFD struct {
+	_     structs.HostLayout
 	CtlFD int32
 }

@@ -103,6 +108,7 @@ type IoctlRegisterFD struct {
 //
 // +marshal
 type IoctlAllocOSEvent struct {
+	_       structs.HostLayout
 	HClient Handle
 	HDevice Handle
 	FD      uint32
@@ -133,6 +139,7 @@ func (p *IoctlAllocOSEvent) SetStatus(status uint32) {
 //
 // +marshal
 type IoctlFreeOSEvent struct {
+	_       structs.HostLayout
 	HClient Handle
 	HDevice Handle
 	FD      uint32
@@ -163,6 +170,7 @@ func (p *IoctlFreeOSEvent) SetStatus(status uint32) {
 //
 // +marshal
 type RMAPIVersion struct {
+	_             structs.HostLayout
 	Cmd           uint32
 	Reply         uint32
 	VersionString [64]byte
@@ -172,6 +180,7 @@ type RMAPIVersion struct {
 //
 // +marshal
 type IoctlSysParams struct {
+	_            structs.HostLayout
 	MemblockSize uint64
 }

@@ -179,6 +188,7 @@ type IoctlSysParams struct {
 //
 // +marshal
 type IoctlWaitOpenComplete struct {
+	_             structs.HostLayout
 	Rc            int32
 	AdapterStatus uint32
 }
@@ -197,6 +207,7 @@ func (p *IoctlWaitOpenComplete) SetStatus(status uint32) {
 //
 // +marshal
 type IoctlNVOS02ParametersWithFD struct {
+	_      structs.HostLayout
 	Params NVOS02_PARAMETERS
 	FD     int32
 	Pad0   [4]byte
@@ -214,6 +225,7 @@ func (p *IoctlNVOS02ParametersWithFD) SetStatus(status uint32) {

 // +marshal
 type NVOS02_PARAMETERS struct {
+	_             structs.HostLayout
 	HRoot         Handle
 	HObjectParent Handle
 	HObjectNew    Handle
@@ -241,6 +253,7 @@ const (
 //
 // +marshal
 type NVOS00_PARAMETERS struct {
+	_             structs.HostLayout
 	HRoot         Handle
 	HObjectParent Handle
 	HObjectOld    Handle
@@ -285,6 +298,7 @@ func GetRmAllocParamObj(isNVOS64 bool) RmAllocParamType {
 //
 // +marshal
 type NVOS21_PARAMETERS struct {
+	_             structs.HostLayout
 	HRoot         Handle
 	HObjectParent Handle
 	HObjectNew    Handle
@@ -355,6 +369,7 @@ func (n *NVOS21_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS55_PARAMETERS struct {
+	_          structs.HostLayout
 	HClient    Handle
 	HParent    Handle
 	HObject    Handle
@@ -378,6 +393,7 @@ func (n *NVOS55_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS57_PARAMETERS struct {
+	_           structs.HostLayout
 	HClient     Handle
 	HObject     Handle
 	SharePolicy RS_SHARE_POLICY
@@ -398,6 +414,7 @@ func (n *NVOS57_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS30_PARAMETERS struct {
+	_           structs.HostLayout
 	Client      Handle
 	Device      Handle
 	Channel     Handle
@@ -427,6 +444,7 @@ func (n *NVOS30_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS32_PARAMETERS struct {
+	_             structs.HostLayout
 	HRoot         Handle
 	HObjectParent Handle
 	Function      uint32
@@ -457,6 +475,7 @@ const (
 // NVOS32AllocSize is the type of NVOS32Parameters.Data for
 // NVOS32_FUNCTION_ALLOC_SIZE.
 type NVOS32AllocSize struct {
+	_               structs.HostLayout
 	Owner           uint32
 	HMemory         Handle
 	Type            uint32
@@ -505,6 +524,7 @@ const (
 //
 // +marshal
 type IoctlNVOS33ParametersWithFD struct {
+	_      structs.HostLayout
 	Params NVOS33_PARAMETERS
 	FD     int32
 	Pad0   [4]byte
@@ -522,6 +542,7 @@ func (p *IoctlNVOS33ParametersWithFD) SetStatus(status uint32) {

 // +marshal
 type NVOS33_PARAMETERS struct {
+	_              structs.HostLayout
 	HClient        Handle
 	HDevice        Handle
 	HMemory        Handle
@@ -549,6 +570,7 @@ const (
 //
 // +marshal
 type NVOS34_PARAMETERS struct {
+	_              structs.HostLayout
 	HClient        Handle
 	HDevice        Handle
 	HMemory        Handle
@@ -572,6 +594,7 @@ func (n *NVOS34_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS39_PARAMETERS struct {
+	_             structs.HostLayout
 	HObjectParent Handle
 	HSubDevice    Handle
 	HObjectNew    Handle
@@ -600,6 +623,7 @@ func (n *NVOS39_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS46_PARAMETERS struct {
+	_         structs.HostLayout
 	Client    Handle
 	Device    Handle
 	Dma       Handle
@@ -628,6 +652,7 @@ func (n *NVOS46_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS46_PARAMETERS_V580 struct {
+	_            structs.HostLayout
 	Client       Handle
 	Device       Handle
 	Dma          Handle
@@ -657,6 +682,7 @@ func (n *NVOS46_PARAMETERS_V580) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS47_PARAMETERS struct {
+	_         structs.HostLayout
 	Client    Handle
 	Device    Handle
 	Dma       Handle
@@ -683,6 +709,7 @@ func (n *NVOS47_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS47_PARAMETERS_V550 struct {
+	_         structs.HostLayout
 	Client    Handle
 	Device    Handle
 	Dma       Handle
@@ -709,6 +736,7 @@ func (n *NVOS47_PARAMETERS_V550) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS54_PARAMETERS struct {
+	_          structs.HostLayout
 	HClient    Handle
 	HObject    Handle
 	Cmd        uint32
@@ -732,6 +760,7 @@ func (n *NVOS54_PARAMETERS) SetStatus(status uint32) {
 //
 // +marshal
 type NVOS56_PARAMETERS struct {
+	_              structs.HostLayout
 	HClient        Handle
 	HDevice        Handle
 	HMemory        Handle
@@ -757,6 +786,7 @@ func (n *NVOS56_PARAMETERS) SetStatus(status uint32) {
 // +marshal
 // +stateify savable
 type NVOS64_PARAMETERS struct {
+	_                structs.HostLayout
 	HRoot            Handle
 	HObjectParent    Handle
 	HObjectNew       Handle
@@ -18,6 +18,7 @@ package nvgpu

 import (
 	"fmt"
+	"structs"
 )

 // Device numbers.
@@ -39,6 +40,7 @@ const (
 // +marshal
 // +stateify savable
 type Handle struct {
+	_   structs.HostLayout
 	Val uint32
 }

@@ -70,6 +72,7 @@ const (
 // +marshal
 // +stateify savable
 type RS_ACCESS_MASK struct {
+	_     structs.HostLayout
 	Limbs [SDK_RS_ACCESS_MAX_LIMBS]uint32 // RsAccessLimb
 }

@@ -80,6 +83,7 @@ const SDK_RS_ACCESS_MAX_LIMBS = 1
 //
 // +marshal
 type RS_SHARE_POLICY struct {
+	_          structs.HostLayout
 	Target     uint32
 	AccessMask RS_ACCESS_MASK
 	Type       uint16
@@ -14,6 +14,10 @@

 package nvgpu

+import (
+	"structs"
+)
+
 // UVM ioctl commands.
 const (
 	// From kernel-open/nvidia-uvm/uvm_linux_ioctl.h:
@@ -56,6 +60,7 @@ const (

 // +marshal
 type UVM_INITIALIZE_PARAMS struct {
+	_        structs.HostLayout
 	Flags    uint64
 	RMStatus uint32
 	Pad0     [4]byte
@@ -78,6 +83,7 @@ const (

 // +marshal
 type UVM_CREATE_RANGE_GROUP_PARAMS struct {
+	_            structs.HostLayout
 	RangeGroupID uint64
 	RMStatus     uint32
 	Pad0         [4]byte
@@ -95,6 +101,7 @@ func (p *UVM_CREATE_RANGE_GROUP_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_DESTROY_RANGE_GROUP_PARAMS struct {
+	_            structs.HostLayout
 	RangeGroupID uint64
 	RMStatus     uint32
 	Pad0         [4]byte
@@ -112,6 +119,7 @@ func (p *UVM_DESTROY_RANGE_GROUP_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_REGISTER_GPU_VASPACE_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUID  NvUUID
 	RMCtrlFD int32
 	HClient  Handle
@@ -141,6 +149,7 @@ func (p *UVM_REGISTER_GPU_VASPACE_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_UNREGISTER_GPU_VASPACE_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUID  NvUUID
 	RMStatus uint32
 }
@@ -157,6 +166,7 @@ func (p *UVM_UNREGISTER_GPU_VASPACE_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_REGISTER_CHANNEL_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUID  NvUUID
 	RMCtrlFD int32
 	HClient  Handle
@@ -190,6 +200,7 @@ func (p *UVM_REGISTER_CHANNEL_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_UNREGISTER_CHANNEL_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUID  NvUUID
 	HClient  Handle
 	HChannel Handle
@@ -208,6 +219,7 @@ func (p *UVM_UNREGISTER_CHANNEL_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_ENABLE_PEER_ACCESS_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUIDA NvUUID
 	GPUUUIDB NvUUID
 	RMStatus uint32
@@ -225,6 +237,7 @@ func (p *UVM_ENABLE_PEER_ACCESS_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_DISABLE_PEER_ACCESS_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUIDA NvUUID
 	GPUUUIDB NvUUID
 	RMStatus uint32
@@ -242,6 +255,7 @@ func (p *UVM_DISABLE_PEER_ACCESS_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_SET_RANGE_GROUP_PARAMS struct {
+	_             structs.HostLayout
 	RangeGroupID  uint64
 	RequestedBase uint64
 	Length        uint64
@@ -261,6 +275,7 @@ func (p *UVM_SET_RANGE_GROUP_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_MAP_EXTERNAL_ALLOCATION_PARAMS struct {
+	_                  structs.HostLayout
 	Base               uint64
 	Length             uint64
 	Offset             uint64
@@ -294,6 +309,7 @@ func (p *UVM_MAP_EXTERNAL_ALLOCATION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_MAP_EXTERNAL_ALLOCATION_PARAMS_V550 struct {
+	_                  structs.HostLayout
 	Base               uint64
 	Length             uint64
 	Offset             uint64
@@ -327,6 +343,7 @@ func (p *UVM_MAP_EXTERNAL_ALLOCATION_PARAMS_V550) SetStatus(status uint32) {

 // +marshal
 type UVM_FREE_PARAMS struct {
+	_        structs.HostLayout
 	Base     uint64
 	Length   uint64
 	RMStatus uint32
@@ -345,6 +362,7 @@ func (p *UVM_FREE_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_REGISTER_GPU_PARAMS struct {
+	_           structs.HostLayout
 	GPUUUID     NvUUID
 	NumaEnabled uint8
 	Pad         [3]byte
@@ -377,6 +395,7 @@ func (p *UVM_REGISTER_GPU_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_UNREGISTER_GPU_PARAMS struct {
+	_        structs.HostLayout
 	GPUUUID  NvUUID
 	RMStatus uint32
 }
@@ -393,6 +412,7 @@ func (p *UVM_UNREGISTER_GPU_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_PAGEABLE_MEM_ACCESS_PARAMS struct {
+	_                 structs.HostLayout
 	PageableMemAccess uint8
 	Pad               [3]byte
 	RMStatus          uint32
@@ -410,6 +430,7 @@ func (p *UVM_PAGEABLE_MEM_ACCESS_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_SET_PREFERRED_LOCATION_PARAMS struct {
+	_                 structs.HostLayout
 	RequestedBase     uint64
 	Length            uint64
 	PreferredLocation NvUUID
@@ -429,6 +450,7 @@ func (p *UVM_SET_PREFERRED_LOCATION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_SET_PREFERRED_LOCATION_PARAMS_V550 struct {
+	_                    structs.HostLayout
 	RequestedBase        uint64
 	Length               uint64
 	PreferredLocation    NvUUID
@@ -448,6 +470,7 @@ func (p *UVM_SET_PREFERRED_LOCATION_PARAMS_V550) SetStatus(status uint32) {

 // +marshal
 type UVM_UNSET_PREFERRED_LOCATION_PARAMS struct {
+	_             structs.HostLayout
 	RequestedBase uint64
 	Length        uint64
 	RMStatus      uint32
@@ -466,6 +489,7 @@ func (p *UVM_UNSET_PREFERRED_LOCATION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_ENABLE_READ_DUPLICATION_PARAMS struct {
+	_             structs.HostLayout
 	RequestedBase uint64
 	Length        uint64
 	RMStatus      uint32
@@ -484,6 +508,7 @@ func (p *UVM_ENABLE_READ_DUPLICATION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_DISABLE_READ_DUPLICATION_PARAMS struct {
+	_             structs.HostLayout
 	RequestedBase uint64
 	Length        uint64
 	RMStatus      uint32
@@ -502,6 +527,7 @@ func (p *UVM_DISABLE_READ_DUPLICATION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_SET_ACCESSED_BY_PARAMS struct {
+	_              structs.HostLayout
 	RequestedBase  uint64
 	Length         uint64
 	AccessedByUUID NvUUID
@@ -521,6 +547,7 @@ func (p *UVM_SET_ACCESSED_BY_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_UNSET_ACCESSED_BY_PARAMS struct {
+	_              structs.HostLayout
 	RequestedBase  uint64
 	Length         uint64
 	AccessedByUUID NvUUID
@@ -540,6 +567,7 @@ func (p *UVM_UNSET_ACCESSED_BY_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_MIGRATE_PARAMS struct {
+	_                structs.HostLayout
 	Base             uint64
 	Length           uint64
 	DestinationUUID  NvUUID
@@ -569,6 +597,7 @@ func (p *UVM_MIGRATE_PARAMS) SetStatus(status uint32) {
 //
 // +marshal
 type UVM_MIGRATE_PARAMS_V550 struct {
+	_                structs.HostLayout
 	Base             uint64
 	Length           uint64
 	DestinationUUID  NvUUID
@@ -595,6 +624,7 @@ func (p *UVM_MIGRATE_PARAMS_V550) SetStatus(status uint32) {

 // +marshal
 type UVM_MIGRATE_RANGE_GROUP_PARAMS struct {
+	_               structs.HostLayout
 	RangeGroupID    uint64
 	DestinationUUID NvUUID
 	RMStatus        uint32
@@ -613,6 +643,7 @@ func (p *UVM_MIGRATE_RANGE_GROUP_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_TOOLS_READ_PROCESS_MEMORY_PARAMS struct {
+	_         structs.HostLayout
 	Buffer    uint64
 	Size      uint64
 	TargetVA  uint64
@@ -633,6 +664,7 @@ func (p *UVM_TOOLS_READ_PROCESS_MEMORY_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_TOOLS_WRITE_PROCESS_MEMORY_PARAMS struct {
+	_            structs.HostLayout
 	Buffer       uint64
 	Size         uint64
 	TargetVA     uint64
@@ -653,6 +685,7 @@ func (p *UVM_TOOLS_WRITE_PROCESS_MEMORY_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_MAP_DYNAMIC_PARALLELISM_REGION_PARAMS struct {
+	_        structs.HostLayout
 	Base     uint64
 	Length   uint64
 	GPUUUID  NvUUID
@@ -672,6 +705,7 @@ func (p *UVM_MAP_DYNAMIC_PARALLELISM_REGION_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_UNMAP_EXTERNAL_PARAMS struct {
+	_        structs.HostLayout
 	Base     uint64
 	Length   uint64
 	GPUUUID  NvUUID
@@ -691,6 +725,7 @@ func (p *UVM_UNMAP_EXTERNAL_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_ALLOC_SEMAPHORE_POOL_PARAMS struct {
+	_                  structs.HostLayout
 	Base               uint64
 	Length             uint64
 	PerGPUAttributes   [UVM_MAX_GPUS]UvmGpuMappingAttributes
@@ -711,6 +746,7 @@ func (p *UVM_ALLOC_SEMAPHORE_POOL_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_ALLOC_SEMAPHORE_POOL_PARAMS_V550 struct {
+	_                  structs.HostLayout
 	Base               uint64
 	Length             uint64
 	PerGPUAttributes   [UVM_MAX_GPUS_V2]UvmGpuMappingAttributes
@@ -731,6 +767,7 @@ func (p *UVM_ALLOC_SEMAPHORE_POOL_PARAMS_V550) SetStatus(status uint32) {

 // +marshal
 type UVM_PAGEABLE_MEM_ACCESS_ON_GPU_PARAMS struct {
+	_                 structs.HostLayout
 	GPUUUID           NvUUID
 	PageableMemAccess uint8
 	Pad               [3]byte
@@ -749,6 +786,7 @@ func (p *UVM_PAGEABLE_MEM_ACCESS_ON_GPU_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_VALIDATE_VA_RANGE_PARAMS struct {
+	_        structs.HostLayout
 	Base     uint64
 	Length   uint64
 	RMStatus uint32
@@ -767,6 +805,7 @@ func (p *UVM_VALIDATE_VA_RANGE_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_CREATE_EXTERNAL_RANGE_PARAMS struct {
+	_        structs.HostLayout
 	Base     uint64
 	Length   uint64
 	RMStatus uint32
@@ -785,6 +824,7 @@ func (p *UVM_CREATE_EXTERNAL_RANGE_PARAMS) SetStatus(status uint32) {

 // +marshal
 type UVM_MM_INITIALIZE_PARAMS struct {
+	_        structs.HostLayout
 	UvmFD    int32
 	RMStatus uint32
 }
@@ -808,6 +848,7 @@ const (

 // +marshal
 type UvmGpuMappingAttributes struct {
+	_                  structs.HostLayout
 	GPUUUID            NvUUID
 	GPUMappingType     uint32
 	GPUCachingType     uint32
@@ -11,5 +11,6 @@ go_library(
        "sentry.go",
        "syscall.go",
    ],
+    hostlayout = True,
    visibility = ["//:sandbox"],
 )
@@ -7,5 +7,6 @@ licenses(["notice"])
 go_library(
    name = "tpu",
    srcs = ["tpu.go"],
+    hostlayout = True,
    visibility = ["//pkg/sentry:internal"],
 )
@@ -132,6 +132,16 @@ func (ins *Instruction) String() string {
 	return s
 }

+// RawInstruction returns a linux.BPFInstruction with the given fields.
+func RawInstruction(opCode uint16, jumpIfTrue, jumpIfFalse uint8, k uint32) Instruction {
+	return Instruction{
+		OpCode:      opCode,
+		JumpIfTrue:  jumpIfTrue,
+		JumpIfFalse: jumpIfFalse,
+		K:           k,
+	}
+}
+
 // Stmt returns an Instruction representing a BPF non-jump instruction.
 func Stmt(code uint16, k uint32) Instruction {
 	return Instruction{
@@ -898,21 +898,21 @@ func TestValidInstructions(t *testing.T) {
 // Documentation/networking/filter.txt, translated to bytecode using the
 // Linux kernel tree's tools/net/bpf_asm.
 var sampleFilter = []Instruction{
-	{0x20, 0, 0, 0x00000004},  // ld [4]                  /* offsetof(struct seccomp_data, arch) */
-	{0x15, 0, 11, 0xc000003e}, // jne #0xc000003e, bad    /* AUDIT_ARCH_X86_64 */
-	{0x20, 0, 0, 0000000000},  // ld [0]                  /* offsetof(struct seccomp_data, nr) */
-	{0x15, 10, 0, 0x0000000f}, // jeq #15, good           /* __NR_rt_sigreturn */
-	{0x15, 9, 0, 0x000000e7},  // jeq #231, good          /* __NR_exit_group */
-	{0x15, 8, 0, 0x0000003c},  // jeq #60, good           /* __NR_exit */
-	{0x15, 7, 0, 0000000000},  // jeq #0, good            /* __NR_read */
-	{0x15, 6, 0, 0x00000001},  // jeq #1, good            /* __NR_write */
-	{0x15, 5, 0, 0x00000005},  // jeq #5, good            /* __NR_fstat */
-	{0x15, 4, 0, 0x00000009},  // jeq #9, good            /* __NR_mmap */
-	{0x15, 3, 0, 0x0000000e},  // jeq #14, good           /* __NR_rt_sigprocmask */
-	{0x15, 2, 0, 0x0000000d},  // jeq #13, good           /* __NR_rt_sigaction */
-	{0x15, 1, 0, 0x00000023},  // jeq #35, good           /* __NR_nanosleep */
-	{0x06, 0, 0, 0000000000},  // bad: ret #0             /* SECCOMP_RET_KILL */
-	{0x06, 0, 0, 0x7fff0000},  // good: ret #0x7fff0000   /* SECCOMP_RET_ALLOW */
+	RawInstruction(0x20, 0, 0, 0x00000004),  // ld [4]                  /* offsetof(struct seccomp_data, arch) */
+	RawInstruction(0x15, 0, 11, 0xc000003e), // jne #0xc000003e, bad    /* AUDIT_ARCH_X86_64 */
+	RawInstruction(0x20, 0, 0, 0000000000),  // ld [0]                  /* offsetof(struct seccomp_data, nr) */
+	RawInstruction(0x15, 10, 0, 0x0000000f), // jeq #15, good           /* __NR_rt_sigreturn */
+	RawInstruction(0x15, 9, 0, 0x000000e7),  // jeq #231, good          /* __NR_exit_group */
+	RawInstruction(0x15, 8, 0, 0x0000003c),  // jeq #60, good           /* __NR_exit */
+	RawInstruction(0x15, 7, 0, 0000000000),  // jeq #0, good            /* __NR_read */
+	RawInstruction(0x15, 6, 0, 0x00000001),  // jeq #1, good            /* __NR_write */
+	RawInstruction(0x15, 5, 0, 0x00000005),  // jeq #5, good            /* __NR_fstat */
+	RawInstruction(0x15, 4, 0, 0x00000009),  // jeq #9, good            /* __NR_mmap */
+	RawInstruction(0x15, 3, 0, 0x0000000e),  // jeq #14, good           /* __NR_rt_sigprocmask */
+	RawInstruction(0x15, 2, 0, 0x0000000d),  // jeq #13, good           /* __NR_rt_sigaction */
+	RawInstruction(0x15, 1, 0, 0x00000023),  // jeq #35, good           /* __NR_nanosleep */
+	RawInstruction(0x06, 0, 0, 0000000000),  // bad: ret #0             /* SECCOMP_RET_KILL */
+	RawInstruction(0x06, 0, 0, 0x7fff0000),  // good: ret #0x7fff0000   /* SECCOMP_RET_ALLOW */
 }

 func TestSimpleFilter(t *testing.T) {
@@ -11,6 +11,7 @@ load("//tools/bazeldefs:go.bzl", _gazelle = "gazelle", _go_binary = "go_binary",
 load("//tools/bazeldefs:pkg.bzl", _pkg_deb = "pkg_deb", _pkg_tar = "pkg_tar")
 load("//tools/bazeldefs:platforms.bzl", _default_platform = "default_platform", _platform_capabilities = "platform_capabilities", _platforms = "platforms", _save_restore_platforms = "save_restore_platforms")
 load("//tools/bazeldefs:tags.bzl", _go_suffixes = "go_suffixes", _local_test_tags = "local_test_tags")
+load("//tools/go_hostlayout:defs.bzl", "go_host_layout_struct_test")
 load("//tools/go_marshal:defs.bzl", "go_marshal", "marshal_deps", "marshal_test_deps")
 load("//tools/go_stateify:defs.bzl", "go_stateify")
 load("//tools/nogo:defs.bzl", "nogo_test")
@@ -134,7 +135,7 @@ def calculate_sets(srcs):
            result[target].append(file)
    return result

-def go_library(name, srcs, deps = [], imports = [], stateify = True, force_add_state_pkg = False, marshal = False, marshal_debug = False, nogo = True, **kwargs):
+def go_library(name, srcs, deps = [], imports = [], stateify = True, force_add_state_pkg = False, marshal = False, marshal_debug = False, nogo = True, hostlayout = False, **kwargs):
    """Wraps the standard go_library and does stateification and marshalling.

    The recommended way is to use this rule with mostly identical configuration as the native
@@ -235,6 +236,14 @@ def go_library(name, srcs, deps = [], imports = [], stateify = True, force_add_s
            tags = ["nogo"],
        )

+    if hostlayout:
+        go_host_layout_struct_test(
+            go_test_rule_func = _go_test,
+            name = name + "_hostlayout_test",
+            srcs = [src for src in srcs if src.endswith(".go")],
+            library = ":" + name,
+        )
+
    if marshal:
        # Ignore importpath for go_test.
        kwargs.pop("importpath", None)
@@ -0,0 +1,15 @@
+load("//tools:defs.bzl", "go_binary")
+
+package(
+    default_applicable_licenses = ["//:license"],
+    licenses = ["notice"],
+)
+
+go_binary(
+    name = "hostlayoutgen",
+    srcs = [
+        "hostlayoutgen.go",
+        "hostlayoutgen_template.go",
+    ],
+    visibility = ["//visibility:public"],
+)
@@ -0,0 +1,31 @@
+"""Defines go_host_layout_struct_test to generate host layout struct tests."""
+
+def go_host_layout_struct_test(go_test_rule_func, name, srcs, library, **kwargs):
+    """Checks that all structs in the given source file have _ structs.HostLayout as their first field.
+
+    Args:
+      go_test_rule_func: the go_test rule function to use.
+      name: the name of the test.
+      srcs: the source files to check.
+      library: the library that the source files belong to.
+      **kwargs: standard arguments.
+    """
+    gen_file = name + "_generated.go"
+
+    native.genrule(
+        name = name + "_gen",
+        srcs = srcs + [library],
+        outs = [gen_file],
+        tools = ["//tools/go_hostlayout:hostlayoutgen"],
+        cmd = "$(location //tools/go_hostlayout:hostlayoutgen) -package " + library.replace(":", "/") + " -out $@ " + " ".join(["$(location %s)" % src for src in srcs]) + " -- $(locations " + library + ")",
+    )
+
+    go_test_rule_func(
+        name = name,
+        srcs = [gen_file],
+        deps = [
+            library,
+            "//tools/go_hostlayout/hostlayoutcheck",
+        ],
+        **kwargs
+    )
@@ -0,0 +1,12 @@
+load("//tools:defs.bzl", "go_library")
+
+package(
+    default_applicable_licenses = ["//:license"],
+    licenses = ["notice"],
+)
+
+go_library(
+    name = "hostlayoutcheck",
+    srcs = ["hostlayoutcheck.go"],
+    visibility = ["//visibility:public"],
+)
@@ -0,0 +1,91 @@
+// Copyright 2026 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package hostlayoutcheck checks for `structs.HostLayout` usage.
+package hostlayoutcheck
+
+import (
+	"fmt"
+	"reflect"
+	"structs"
+)
+
+// Validate checks that t is a struct type and has _ structs.HostLayout as its first field.
+// It recursively checks all struct-typed fields.
+func Validate(t reflect.Type) error {
+	if t.Kind() != reflect.Struct {
+		return fmt.Errorf("type %v is not a struct", t)
+	}
+
+	if t.NumField() == 0 {
+		return fmt.Errorf("struct %v is empty, expected first field to be `_ structs.HostLayout`", t)
+	}
+
+	f := t.Field(0)
+	// We check if the type of the first field is structs.HostLayout.
+	if f.Type != reflect.TypeOf(structs.HostLayout{}) {
+		return fmt.Errorf("struct %v first field must be `structs.HostLayout`, got `%v`", t, f.Type)
+	}
+
+	if f.Name != "_" {
+		return fmt.Errorf("struct %v first field must be named `_`, got `%s`", t, f.Name)
+	}
+
+	// Recursive check for all other fields.
+	// We skip the first field as it is the marker itself.
+	for i := 1; i < t.NumField(); i++ {
+		field := t.Field(i)
+
+		// Skip fields tagged with `hostlayout:"ignore"`.
+		if tag := field.Tag.Get("hostlayout"); tag == "ignore" {
+			continue
+		}
+
+		fieldType := field.Type
+		switch fieldType.Kind() {
+		case reflect.Struct:
+			if err := Validate(fieldType); err != nil {
+				return fmt.Errorf("field %s: %w", field.Name, err)
+			}
+		case reflect.Array:
+			if fieldType.Elem().Kind() == reflect.Struct {
+				if err := Validate(fieldType.Elem()); err != nil {
+					return fmt.Errorf("field %s: %w", field.Name, err)
+				}
+			}
+		case reflect.Ptr:
+			if fieldType.Elem().Kind() == reflect.Struct {
+				if err := Validate(fieldType.Elem()); err != nil {
+					return fmt.Errorf("field %s: %w", field.Name, err)
+				}
+			}
+		case reflect.Map:
+			return fmt.Errorf("field %s: maps are not allowed in host-layout-controlled structs (use `hostlayout:\"ignore\"` to bypass)", field.Name)
+		case reflect.Chan:
+			return fmt.Errorf("field %s: channels are not allowed in host-layout-controlled structs (use `hostlayout:\"ignore\"` to bypass)", field.Name)
+		case reflect.Func:
+			return fmt.Errorf("field %s: functions are not allowed in host-layout-controlled structs (use `hostlayout:\"ignore\"` to bypass)", field.Name)
+		case reflect.Interface:
+			return fmt.Errorf("field %s: interfaces are not allowed in host-layout-controlled structs (use `hostlayout:\"ignore\"` to bypass)", field.Name)
+		case reflect.Slice:
+			return fmt.Errorf("field %s: slices are not allowed in host-layout-controlled structs (use `hostlayout:\"ignore\"` to bypass)", field.Name)
+		case reflect.String:
+			// Allow strings only if they are specifically named "CString".
+			if fieldType.Name() != "CString" {
+				return fmt.Errorf("field %s: strings are not allowed in host-layout-controlled structs; use the CString type or `hostlayout:\"ignore\"` if you know what you are doing", field.Name)
+			}
+		}
+	}
+	return nil
+}
@@ -0,0 +1,129 @@
+// Copyright 2026 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Generate a Go unit test file that checks for `structs.HostLayout` usage.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"text/template"
+)
+
+var (
+	pkg     = flag.String("package", "", "Name of the Go library package")
+	outPath = flag.String("out", "", "Output test file path")
+)
+
+func main() {
+	flag.Parse()
+	if *pkg == "" || *outPath == "" {
+		fmt.Fprintln(os.Stderr, "Usage: hostlayout -package <package> -out <output_test.go> src1.go src2.go -- lib.a lib.x")
+		os.Exit(1)
+	}
+
+	var structs []string
+	afterDashDash := false
+	libraryImportPath := ""
+	for _, srcPath := range flag.Args() {
+		if srcPath == "--" {
+			afterDashDash = true
+			continue
+		}
+		if !afterDashDash {
+			fset := token.NewFileSet()
+			f, err := parser.ParseFile(fset, srcPath, nil, parser.ParseComments)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Failed to parse %s: %v\n", srcPath, err)
+				os.Exit(1)
+			}
+			for _, decl := range f.Decls {
+				genDecl, ok := decl.(*ast.GenDecl)
+				if !ok || genDecl.Tok != token.TYPE {
+					continue
+				}
+				for _, spec := range genDecl.Specs {
+					typeSpec, ok := spec.(*ast.TypeSpec)
+					if !ok {
+						continue
+					}
+					// Only check exported structs
+					if !typeSpec.Name.IsExported() {
+						continue
+					}
+					if _, ok := typeSpec.Type.(*ast.StructType); ok && !slices.Contains(structs, typeSpec.Name.Name) {
+						// We check for slices.Contains because duplicates can happen,
+						// for example due to files with conditional compilation directives.
+						structs = append(structs, typeSpec.Name.Name)
+					}
+				}
+			}
+			continue
+		}
+		if !strings.HasSuffix(srcPath, ".a") && !strings.HasSuffix(srcPath, ".x") {
+			continue
+		}
+		libraryImportPath = strings.TrimSuffix(strings.TrimSuffix(srcPath, ".a"), ".x")
+	}
+	if libraryImportPath == "" {
+		fmt.Fprintf(os.Stderr, "Failed to find library import path\n")
+		os.Exit(1)
+	}
+
+	if len(structs) == 0 {
+		// No exported structs, create empty test file to satisfy build rules
+		contents := `
+package ` + filepath.Base(*pkg) + `_hostlayout_test
+
+import (
+	"testing"
+)
+
+func TestDummy(t *testing.T) {
+	// Needed to avoid errors in case the package has no exported structs.
+}
+`
+		if err := os.WriteFile(*outPath, []byte(contents), 0644); err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to write empty test file: %v\n", err)
+			os.Exit(1)
+		}
+		return
+	}
+
+	tmplData, err := newTemplateData(filepath.Base(*pkg), libraryImportPath, structs)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to create template data: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Create output file
+	outF, err := os.Create(*outPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to create %s: %v\n", *outPath, err)
+		os.Exit(1)
+	}
+	defer outF.Close()
+	t := template.Must(template.New("test").Parse(testTmpl))
+	if err := t.Execute(outF, tmplData); err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to execute template: %v\n", err)
+		os.Exit(1)
+	}
+}
@@ -0,0 +1,62 @@
+// Copyright 2026 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !false
+// +build !false
+
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+const testTmpl = `// Autogenerated test for hostlayout check.
+package {{.Package}}_hostlayout_test
+
+import (
+	"reflect"
+	"testing"
+
+	"{{.ImportPath}}"
+	"gvisor.dev/gvisor/tools/go_hostlayout/hostlayoutcheck"
+)
+
+{{range .Structs}}
+func TestHostLayout_{{.}}(t *testing.T) {
+	if err := hostlayoutcheck.Validate(reflect.TypeOf((*{{$.Package}}.{{.}})(nil)).Elem()); err != nil {
+		t.Errorf("Struct {{.}} failed hostlayout check: %v", err)
+	}
+}
+{{end}}
+`
+
+type templateData struct {
+	Package    string
+	ImportPath string
+	Structs    []string
+}
+
+func newTemplateData(pkg string, importPath string, structs []string) (*templateData, error) {
+	idx := strings.Index(importPath, "pkg/")
+	if idx == -1 {
+		return nil, fmt.Errorf("failed to find 'pkg/' in %q", importPath)
+	}
+	return &templateData{
+		Package:    pkg,
+		ImportPath: filepath.Join("gvisor.dev", "gvisor", filepath.Dir(importPath[idx:])),
+		Structs:    structs,
+	}, nil
+}
@@ -65,6 +65,12 @@ func kindString(e ast.Expr) string {

 func forEachStructField(st *ast.StructType, fn func(f *ast.Field)) {
 	for _, field := range st.Fields.List {
+		// Ignore structs.HostLayout field if present.
+		if selExpr, ok := field.Type.(*ast.SelectorExpr); ok {
+			if xIdent, ok := selExpr.X.(*ast.Ident); ok && xIdent.Name == "structs" && selExpr.Sel.Name == "HostLayout" {
+				continue
+			}
+		}
 		fn(field)
 	}
 }