visor/pkg/sentry/devices/tpuproxy/vfio/tpu_fd_mmap.go

// Copyright 2024 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 vfio

import (
	"gvisor.dev/gvisor/pkg/context"
	"gvisor.dev/gvisor/pkg/hostarch"
	"gvisor.dev/gvisor/pkg/sentry/memmap"
	"gvisor.dev/gvisor/pkg/sentry/vfs"
)

// ConfigureMMap implements vfs.FileDescriptionImpl.ConfigureMMap.
func (fd *tpuFD) ConfigureMMap(ctx context.Context, opts *memmap.MMapOpts) error {
	return vfs.GenericProxyDeviceConfigureMMap(&fd.vfsfd, fd, opts)
}

// Translate implements memmap.Mappable.Translate.
func (fd *tpuFD) Translate(ctx context.Context, required, optional memmap.MappableRange, at hostarch.AccessType) ([]memmap.Translation, error) {
	return []memmap.Translation{
		{
			Source: optional,
			File:   &fd.memmapFile,
			Offset: optional.Start,
			Perms:  hostarch.AnyAccess,
		},
	}, nil
}