gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/ring0/pagetables/pagetables_arm64_test.go (about)

     1  // Copyright 2019 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  //go:build arm64
    16  // +build arm64
    17  
    18  package pagetables
    19  
    20  import (
    21  	"testing"
    22  
    23  	"gvisor.dev/gvisor/pkg/hostarch"
    24  )
    25  
    26  func Test2MAnd4K(t *testing.T) {
    27  	pt := New(NewRuntimeAllocator())
    28  
    29  	// Map a small page and a huge page.
    30  	pt.Map(0x400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: true}, pteSize*42)
    31  	pt.Map(0x0000ff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: true}, pmdSize*47)
    32  
    33  	pt.Map(0xffff000000400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: false}, pteSize*42)
    34  	pt.Map(0xffffff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: false}, pmdSize*47)
    35  
    36  	checkMappings(t, pt, []mapping{
    37  		{0x400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: true}},
    38  		{0x0000ff0000000000, pmdSize, pmdSize * 47, MapOpts{AccessType: hostarch.Read, User: true}},
    39  		{0xffff000000400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: false}},
    40  		{0xffffff0000000000, pmdSize, pmdSize * 47, MapOpts{AccessType: hostarch.Read, User: false}},
    41  	})
    42  }
    43  
    44  func Test1GAnd4K(t *testing.T) {
    45  	pt := New(NewRuntimeAllocator())
    46  
    47  	// Map a small page and a super page.
    48  	pt.Map(0x400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: true}, pteSize*42)
    49  	pt.Map(0x0000ff0000000000, pudSize, MapOpts{AccessType: hostarch.Read, User: true}, pudSize*47)
    50  
    51  	checkMappings(t, pt, []mapping{
    52  		{0x400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: true}},
    53  		{0x0000ff0000000000, pudSize, pudSize * 47, MapOpts{AccessType: hostarch.Read, User: true}},
    54  	})
    55  }
    56  
    57  func TestSplit1GPage(t *testing.T) {
    58  	pt := New(NewRuntimeAllocator())
    59  
    60  	// Map a super page and knock out the middle.
    61  	pt.Map(0x0000ff0000000000, pudSize, MapOpts{AccessType: hostarch.Read, User: true}, pudSize*42)
    62  	pt.Unmap(hostarch.Addr(0x0000ff0000000000+pteSize), pudSize-(2*pteSize))
    63  
    64  	checkMappings(t, pt, []mapping{
    65  		{0x0000ff0000000000, pteSize, pudSize * 42, MapOpts{AccessType: hostarch.Read, User: true}},
    66  		{0x0000ff0000000000 + pudSize - pteSize, pteSize, pudSize*42 + pudSize - pteSize, MapOpts{AccessType: hostarch.Read, User: true}},
    67  	})
    68  }
    69  
    70  func TestSplit2MPage(t *testing.T) {
    71  	pt := New(NewRuntimeAllocator())
    72  
    73  	// Map a huge page and knock out the middle.
    74  	pt.Map(0x0000ff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: true}, pmdSize*42)
    75  	pt.Unmap(hostarch.Addr(0x0000ff0000000000+pteSize), pmdSize-(2*pteSize))
    76  
    77  	checkMappings(t, pt, []mapping{
    78  		{0x0000ff0000000000, pteSize, pmdSize * 42, MapOpts{AccessType: hostarch.Read, User: true}},
    79  		{0x0000ff0000000000 + pmdSize - pteSize, pteSize, pmdSize*42 + pmdSize - pteSize, MapOpts{AccessType: hostarch.Read, User: true}},
    80  	})
    81  }