github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/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  // +build arm64
    16  
    17  package pagetables
    18  
    19  import (
    20  	"testing"
    21  
    22  	"github.com/SagerNet/gvisor/pkg/hostarch"
    23  )
    24  
    25  func Test2MAnd4K(t *testing.T) {
    26  	pt := New(NewRuntimeAllocator())
    27  
    28  	// Map a small page and a huge page.
    29  	pt.Map(0x400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: true}, pteSize*42)
    30  	pt.Map(0x0000ff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: true}, pmdSize*47)
    31  
    32  	pt.Map(0xffff000000400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: false}, pteSize*42)
    33  	pt.Map(0xffffff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: false}, pmdSize*47)
    34  
    35  	checkMappings(t, pt, []mapping{
    36  		{0x400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: true}},
    37  		{0x0000ff0000000000, pmdSize, pmdSize * 47, MapOpts{AccessType: hostarch.Read, User: true}},
    38  		{0xffff000000400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: false}},
    39  		{0xffffff0000000000, pmdSize, pmdSize * 47, MapOpts{AccessType: hostarch.Read, User: false}},
    40  	})
    41  }
    42  
    43  func Test1GAnd4K(t *testing.T) {
    44  	pt := New(NewRuntimeAllocator())
    45  
    46  	// Map a small page and a super page.
    47  	pt.Map(0x400000, pteSize, MapOpts{AccessType: hostarch.ReadWrite, User: true}, pteSize*42)
    48  	pt.Map(0x0000ff0000000000, pudSize, MapOpts{AccessType: hostarch.Read, User: true}, pudSize*47)
    49  
    50  	checkMappings(t, pt, []mapping{
    51  		{0x400000, pteSize, pteSize * 42, MapOpts{AccessType: hostarch.ReadWrite, User: true}},
    52  		{0x0000ff0000000000, pudSize, pudSize * 47, MapOpts{AccessType: hostarch.Read, User: true}},
    53  	})
    54  }
    55  
    56  func TestSplit1GPage(t *testing.T) {
    57  	pt := New(NewRuntimeAllocator())
    58  
    59  	// Map a super page and knock out the middle.
    60  	pt.Map(0x0000ff0000000000, pudSize, MapOpts{AccessType: hostarch.Read, User: true}, pudSize*42)
    61  	pt.Unmap(hostarch.Addr(0x0000ff0000000000+pteSize), pudSize-(2*pteSize))
    62  
    63  	checkMappings(t, pt, []mapping{
    64  		{0x0000ff0000000000, pteSize, pudSize * 42, MapOpts{AccessType: hostarch.Read, User: true}},
    65  		{0x0000ff0000000000 + pudSize - pteSize, pteSize, pudSize*42 + pudSize - pteSize, MapOpts{AccessType: hostarch.Read, User: true}},
    66  	})
    67  }
    68  
    69  func TestSplit2MPage(t *testing.T) {
    70  	pt := New(NewRuntimeAllocator())
    71  
    72  	// Map a huge page and knock out the middle.
    73  	pt.Map(0x0000ff0000000000, pmdSize, MapOpts{AccessType: hostarch.Read, User: true}, pmdSize*42)
    74  	pt.Unmap(hostarch.Addr(0x0000ff0000000000+pteSize), pmdSize-(2*pteSize))
    75  
    76  	checkMappings(t, pt, []mapping{
    77  		{0x0000ff0000000000, pteSize, pmdSize * 42, MapOpts{AccessType: hostarch.Read, User: true}},
    78  		{0x0000ff0000000000 + pmdSize - pteSize, pteSize, pmdSize*42 + pmdSize - pteSize, MapOpts{AccessType: hostarch.Read, User: true}},
    79  	})
    80  }