github.com/metacubex/gvisor@v0.0.0-20240320004321-933faba989ec/pkg/sentry/devices/nvproxy/uvm_mmap.go (about)

     1  // Copyright 2023 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package nvproxy
    16  
    17  import (
    18  	"github.com/metacubex/gvisor/pkg/context"
    19  	"github.com/metacubex/gvisor/pkg/errors/linuxerr"
    20  	"github.com/metacubex/gvisor/pkg/hostarch"
    21  	"github.com/metacubex/gvisor/pkg/log"
    22  	"github.com/metacubex/gvisor/pkg/safemem"
    23  	"github.com/metacubex/gvisor/pkg/sentry/memmap"
    24  	"github.com/metacubex/gvisor/pkg/sentry/vfs"
    25  )
    26  
    27  // ConfigureMMap implements vfs.FileDescriptionImpl.ConfigureMMap.
    28  func (fd *uvmFD) ConfigureMMap(ctx context.Context, opts *memmap.MMapOpts) error {
    29  	// UVM_VALIDATE_VA_RANGE, and probably other ioctls, expect that
    30  	// application mmaps of /dev/nvidia-uvm are immediately visible to the
    31  	// driver.
    32  	if opts.PlatformEffect < memmap.PlatformEffectPopulate {
    33  		opts.PlatformEffect = memmap.PlatformEffectPopulate
    34  	}
    35  	return vfs.GenericConfigureMMap(&fd.vfsfd, fd, opts)
    36  }
    37  
    38  // AddMapping implements memmap.Mappable.AddMapping.
    39  func (fd *uvmFD) AddMapping(ctx context.Context, ms memmap.MappingSpace, ar hostarch.AddrRange, offset uint64, writable bool) error {
    40  	return nil
    41  }
    42  
    43  // RemoveMapping implements memmap.Mappable.RemoveMapping.
    44  func (fd *uvmFD) RemoveMapping(ctx context.Context, ms memmap.MappingSpace, ar hostarch.AddrRange, offset uint64, writable bool) {
    45  }
    46  
    47  // CopyMapping implements memmap.Mappable.CopyMapping.
    48  func (fd *uvmFD) CopyMapping(ctx context.Context, ms memmap.MappingSpace, srcAR, dstAR hostarch.AddrRange, offset uint64, writable bool) error {
    49  	return nil
    50  }
    51  
    52  // Translate implements memmap.Mappable.Translate.
    53  func (fd *uvmFD) Translate(ctx context.Context, required, optional memmap.MappableRange, at hostarch.AccessType) ([]memmap.Translation, error) {
    54  	return []memmap.Translation{
    55  		{
    56  			Source: optional,
    57  			File:   &fd.memmapFile,
    58  			Offset: optional.Start,
    59  			// kernel-open/nvidia-uvm/uvm.c:uvm_mmap() requires mappings to be
    60  			// PROT_READ|PROT_WRITE.
    61  			Perms: hostarch.ReadWrite,
    62  		},
    63  	}, nil
    64  }
    65  
    66  // InvalidateUnsavable implements memmap.Mappable.InvalidateUnsavable.
    67  func (fd *uvmFD) InvalidateUnsavable(ctx context.Context) error {
    68  	return nil
    69  }
    70  
    71  type uvmFDMemmapFile struct {
    72  	fd *uvmFD
    73  }
    74  
    75  // IncRef implements memmap.File.IncRef.
    76  func (mf *uvmFDMemmapFile) IncRef(fr memmap.FileRange, memCgID uint32) {
    77  }
    78  
    79  // DecRef implements memmap.File.DecRef.
    80  func (mf *uvmFDMemmapFile) DecRef(fr memmap.FileRange) {
    81  }
    82  
    83  // MapInternal implements memmap.File.MapInternal.
    84  func (mf *uvmFDMemmapFile) MapInternal(fr memmap.FileRange, at hostarch.AccessType) (safemem.BlockSeq, error) {
    85  	// TODO(jamieliu): make an attempt with MAP_FIXED_NOREPLACE?
    86  	log.Traceback("nvproxy: rejecting uvmFDMemmapFile.MapInternal")
    87  	return safemem.BlockSeq{}, linuxerr.EINVAL
    88  }
    89  
    90  // FD implements memmap.File.FD.
    91  func (mf *uvmFDMemmapFile) FD() int {
    92  	return int(mf.fd.hostFD)
    93  }