70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
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// Copyright 2018 Google Inc.
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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 kvm
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import (
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"fmt"
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"gvisor.googlesource.com/gvisor/pkg/sentry/platform/ring0/pagetables"
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)
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type allocator struct {
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base *pagetables.RuntimeAllocator
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}
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// newAllocator is used to define the allocator.
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func newAllocator() allocator {
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return allocator{
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base: pagetables.NewRuntimeAllocator(),
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}
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}
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// NewPTEs implements pagetables.Allocator.NewPTEs.
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//
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//go:nosplit
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func (a allocator) NewPTEs() *pagetables.PTEs {
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return a.base.NewPTEs()
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}
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// PhysicalFor returns the physical address for a set of PTEs.
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//
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//go:nosplit
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func (a allocator) PhysicalFor(ptes *pagetables.PTEs) uintptr {
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virtual := a.base.PhysicalFor(ptes)
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physical, _, ok := translateToPhysical(virtual)
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if !ok {
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panic(fmt.Sprintf("PhysicalFor failed for %p", ptes))
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}
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return physical
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}
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// LookupPTEs implements pagetables.Allocator.LookupPTEs.
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//
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//go:nosplit
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func (a allocator) LookupPTEs(physical uintptr) *pagetables.PTEs {
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virtualStart, physicalStart, _, ok := calculateBluepillFault(physical)
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if !ok {
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panic(fmt.Sprintf("LookupPTEs failed for 0x%x", physical))
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}
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return a.base.LookupPTEs(virtualStart + (physical - physicalStart))
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}
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// FreePTEs implements pagetables.Allocator.FreePTEs.
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//
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//go:nosplit
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func (a allocator) FreePTEs(ptes *pagetables.PTEs) {
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a.base.FreePTEs(ptes)
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}
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