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Lucas ManningandgVisor bot
8482715727
This change also adds some small cleanup to TPU code. PiperOrigin-RevId: 737673712
45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
// Copyright 2025 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package vfio
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import (
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"gvisor.dev/gvisor/pkg/context"
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)
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// NOTE: TPU save/restore does not work as expected without tight coordination
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// with the application. TPU device state is not saved, all memory mappings
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// are marked as invalid, and TPU/VFIO related file descriptors are stubbed out.
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// Accessing any TPU memory mappings after restore will result in SIGBUS.
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// Issuing any TPU IOCTL command will be a no-op. Reading and writing to TPU
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// FDs will be a no-op.
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//
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// It is up to the application to release all TPU resources before saving and
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// reinitialize them after restoring.
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func (fd *tpuFD) beforeSave() {
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fd.Release(context.Background())
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fd.hostFD = -1
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}
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func (fd *vfioFD) beforeSave() {
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fd.Release(context.Background())
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fd.hostFD = -1
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}
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func (fd *pciDeviceFD) beforeSave() {
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fd.Release(context.Background())
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fd.hostFD = -1
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}
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