Implement host tracked memory manager mode (#6356)

* Add host tracked memory manager mode

* Skipping flush is no longer needed

* Formatting + revert unrelated change

* LightningJit: Ensure that dest register is saved for load ops that do partial updates

* avoid allocations when doing address space lookup

Add missing improvement

* IsRmwMemory -> IsPartialRegisterUpdateMemory

* Ensure we iterate all private allocations in range

* PR feedback and potential fixes

* Simplified bridges a lot

* Skip calling SignalMappingChanged if Guest is true

* Late map bridge too

* Force address masking for prefetch instructions

* Reprotection for bridges

* Move partition list validation to separate debug method

* Move host tracked related classes to HostTracked folder

* New HostTracked namespace

* Move host tracked modes to the end of enum to avoid PPTC invalidation

---------

Co-authored-by: riperiperi <rhy3756547@hotmail.com>

src/ARMeilleure/Instructions/InstEmitMemoryHelper.cs

@@ -157,7 +157,7 @@ namespace ARMeilleure.Instructions
 
             context.Copy(temp, value);
 
-            if (!context.Memory.Type.IsHostMapped())
+            if (!context.Memory.Type.IsHostMappedOrTracked())
             {
                 context.Branch(lblEnd);
 
@@ -198,7 +198,7 @@ namespace ARMeilleure.Instructions
 
             SetInt(context, rt, value);
 
-            if (!context.Memory.Type.IsHostMapped())
+            if (!context.Memory.Type.IsHostMappedOrTracked())
             {
                 context.Branch(lblEnd);
 
@@ -265,7 +265,7 @@ namespace ARMeilleure.Instructions
 
             context.Copy(GetVec(rt), value);
 
-            if (!context.Memory.Type.IsHostMapped())
+            if (!context.Memory.Type.IsHostMappedOrTracked())
             {
                 context.Branch(lblEnd);
 
@@ -312,7 +312,7 @@ namespace ARMeilleure.Instructions
                     break;
             }
 
-            if (!context.Memory.Type.IsHostMapped())
+            if (!context.Memory.Type.IsHostMappedOrTracked())
             {
                 context.Branch(lblEnd);
 
@@ -385,7 +385,7 @@ namespace ARMeilleure.Instructions
                     break;
             }
 
-            if (!context.Memory.Type.IsHostMapped())
+            if (!context.Memory.Type.IsHostMappedOrTracked())
             {
                 context.Branch(lblEnd);
 
@@ -403,6 +403,27 @@ namespace ARMeilleure.Instructions
             {
                 return EmitHostMappedPointer(context, address);
             }
+            else if (context.Memory.Type.IsHostTracked())
+            {
+                if (address.Type == OperandType.I32)
+                {
+                    address = context.ZeroExtend32(OperandType.I64, address);
+                }
+
+                if (context.Memory.Type == MemoryManagerType.HostTracked)
+                {
+                    Operand mask = Const(ulong.MaxValue >> (64 - context.Memory.AddressSpaceBits));
+                    address = context.BitwiseAnd(address, mask);
+                }
+
+                Operand ptBase = !context.HasPtc
+                    ? Const(context.Memory.PageTablePointer.ToInt64())
+                    : Const(context.Memory.PageTablePointer.ToInt64(), Ptc.PageTableSymbol);
+
+                Operand ptOffset = context.ShiftRightUI(address, Const(PageBits));
+
+                return context.Add(address, context.Load(OperandType.I64, context.Add(ptBase, context.ShiftLeft(ptOffset, Const(3)))));
+            }
 
             int ptLevelBits = context.Memory.AddressSpaceBits - PageBits;
             int ptLevelSize = 1 << ptLevelBits;

src/ARMeilleure/Memory/MemoryManagerType.cs

@@ -29,6 +29,18 @@ namespace ARMeilleure.Memory
         /// Allows invalid access from JIT code to the rest of the program, but is faster.
         /// </summary>
         HostMappedUnsafe,
+
+        /// <summary>
+        /// High level implementation using a software flat page table for address translation
+        /// with no support for handling invalid or non-contiguous memory access.
+        /// </summary>
+        HostTracked,
+
+        /// <summary>
+        /// High level implementation using a software flat page table for address translation
+        /// without masking the address and no support for handling invalid or non-contiguous memory access.
+        /// </summary>
+        HostTrackedUnsafe,
     }
 
     public static class MemoryManagerTypeExtensions
@@ -37,5 +49,15 @@ namespace ARMeilleure.Memory
         {
             return type == MemoryManagerType.HostMapped || type == MemoryManagerType.HostMappedUnsafe;
         }
+
+        public static bool IsHostTracked(this MemoryManagerType type)
+        {
+            return type == MemoryManagerType.HostTracked || type == MemoryManagerType.HostTrackedUnsafe;
+        }
+
+        public static bool IsHostMappedOrTracked(this MemoryManagerType type)
+        {
+            return type.IsHostMapped() || type.IsHostTracked();
+        }
     }
 }

src/ARMeilleure/Signal/NativeSignalHandlerGenerator.cs

@@ -21,10 +21,8 @@ namespace ARMeilleure.Signal
 
         private const uint EXCEPTION_ACCESS_VIOLATION = 0xc0000005;
 
-        private static Operand EmitGenericRegionCheck(EmitterContext context, IntPtr signalStructPtr, Operand faultAddress, Operand isWrite, int rangeStructSize, ulong pageSize)
+        private static Operand EmitGenericRegionCheck(EmitterContext context, IntPtr signalStructPtr, Operand faultAddress, Operand isWrite, int rangeStructSize)
         {
-            ulong pageMask = pageSize - 1;
-
             Operand inRegionLocal = context.AllocateLocal(OperandType.I32);
             context.Copy(inRegionLocal, Const(0));
 
@@ -51,7 +49,7 @@ namespace ARMeilleure.Signal
                 // Only call tracking if in range.
                 context.BranchIfFalse(nextLabel, inRange, BasicBlockFrequency.Cold);
 
-                Operand offset = context.BitwiseAnd(context.Subtract(faultAddress, rangeAddress), Const(~pageMask));
+                Operand offset = context.Subtract(faultAddress, rangeAddress);
 
                 // Call the tracking action, with the pointer's relative offset to the base address.
                 Operand trackingActionPtr = context.Load(OperandType.I64, Const((ulong)signalStructPtr + rangeBaseOffset + 20));
@@ -62,8 +60,10 @@ namespace ARMeilleure.Signal
 
                 // Tracking action should be non-null to call it, otherwise assume false return.
                 context.BranchIfFalse(skipActionLabel, trackingActionPtr);
-                Operand result = context.Call(trackingActionPtr, OperandType.I32, offset, Const(pageSize), isWrite);
-                context.Copy(inRegionLocal, result);
+                Operand result = context.Call(trackingActionPtr, OperandType.I64, offset, Const(1UL), isWrite);
+                context.Copy(inRegionLocal, context.ICompareNotEqual(result, Const(0UL)));
+
+                GenerateFaultAddressPatchCode(context, faultAddress, result);
 
                 context.MarkLabel(skipActionLabel);
 
@@ -155,7 +155,7 @@ namespace ARMeilleure.Signal
             throw new PlatformNotSupportedException();
         }
 
-        public static byte[] GenerateUnixSignalHandler(IntPtr signalStructPtr, int rangeStructSize, ulong pageSize)
+        public static byte[] GenerateUnixSignalHandler(IntPtr signalStructPtr, int rangeStructSize)
         {
             EmitterContext context = new();
 
@@ -168,7 +168,7 @@ namespace ARMeilleure.Signal
 
             Operand isWrite = context.ICompareNotEqual(writeFlag, Const(0L)); // Normalize to 0/1.
 
-            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite, rangeStructSize, pageSize);
+            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite, rangeStructSize);
 
             Operand endLabel = Label();
 
@@ -203,7 +203,7 @@ namespace ARMeilleure.Signal
             return Compiler.Compile(cfg, argTypes, OperandType.None, CompilerOptions.HighCq, RuntimeInformation.ProcessArchitecture).Code;
         }
 
-        public static byte[] GenerateWindowsSignalHandler(IntPtr signalStructPtr, int rangeStructSize, ulong pageSize)
+        public static byte[] GenerateWindowsSignalHandler(IntPtr signalStructPtr, int rangeStructSize)
         {
             EmitterContext context = new();
 
@@ -232,7 +232,7 @@ namespace ARMeilleure.Signal
 
             Operand isWrite = context.ICompareNotEqual(writeFlag, Const(0L)); // Normalize to 0/1.
 
-            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite, rangeStructSize, pageSize);
+            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite, rangeStructSize);
 
             Operand endLabel = Label();
 
@@ -256,5 +256,86 @@ namespace ARMeilleure.Signal
 
             return Compiler.Compile(cfg, argTypes, OperandType.I32, CompilerOptions.HighCq, RuntimeInformation.ProcessArchitecture).Code;
         }
+
+        private static void GenerateFaultAddressPatchCode(EmitterContext context, Operand faultAddress, Operand newAddress)
+        {
+            if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
+            {
+                if (SupportsFaultAddressPatchingForHostOs())
+                {
+                    Operand lblSkip = Label();
+
+                    context.BranchIf(lblSkip, faultAddress, newAddress, Comparison.Equal);
+
+                    Operand ucontextPtr = context.LoadArgument(OperandType.I64, 2);
+                    Operand pcCtxAddress = default;
+                    ulong baseRegsOffset = 0;
+
+                    if (OperatingSystem.IsLinux())
+                    {
+                        pcCtxAddress = context.Add(ucontextPtr, Const(440UL));
+                        baseRegsOffset = 184UL;
+                    }
+                    else if (OperatingSystem.IsMacOS() || OperatingSystem.IsIOS())
+                    {
+                        ucontextPtr = context.Load(OperandType.I64, context.Add(ucontextPtr, Const(48UL)));
+
+                        pcCtxAddress = context.Add(ucontextPtr, Const(272UL));
+                        baseRegsOffset = 16UL;
+                    }
+
+                    Operand pc = context.Load(OperandType.I64, pcCtxAddress);
+
+                    Operand reg = GetAddressRegisterFromArm64Instruction(context, pc);
+                    Operand reg64 = context.ZeroExtend32(OperandType.I64, reg);
+                    Operand regCtxAddress = context.Add(ucontextPtr, context.Add(context.ShiftLeft(reg64, Const(3)), Const(baseRegsOffset)));
+                    Operand regAddress = context.Load(OperandType.I64, regCtxAddress);
+
+                    Operand addressDelta = context.Subtract(regAddress, faultAddress);
+
+                    context.Store(regCtxAddress, context.Add(newAddress, addressDelta));
+
+                    context.MarkLabel(lblSkip);
+                }
+            }
+        }
+
+        private static Operand GetAddressRegisterFromArm64Instruction(EmitterContext context, Operand pc)
+        {
+            Operand inst = context.Load(OperandType.I32, pc);
+            Operand reg = context.AllocateLocal(OperandType.I32);
+
+            Operand isSysInst = context.ICompareEqual(context.BitwiseAnd(inst, Const(0xFFF80000)), Const(0xD5080000));
+
+            Operand lblSys = Label();
+            Operand lblEnd = Label();
+
+            context.BranchIfTrue(lblSys, isSysInst, BasicBlockFrequency.Cold);
+
+            context.Copy(reg, context.BitwiseAnd(context.ShiftRightUI(inst, Const(5)), Const(0x1F)));
+            context.Branch(lblEnd);
+
+            context.MarkLabel(lblSys);
+            context.Copy(reg, context.BitwiseAnd(inst, Const(0x1F)));
+
+            context.MarkLabel(lblEnd);
+
+            return reg;
+        }
+
+        public static bool SupportsFaultAddressPatchingForHost()
+        {
+            return SupportsFaultAddressPatchingForHostArch() && SupportsFaultAddressPatchingForHostOs();
+        }
+
+        private static bool SupportsFaultAddressPatchingForHostArch()
+        {
+            return RuntimeInformation.ProcessArchitecture == Architecture.Arm64;
+        }
+
+        private static bool SupportsFaultAddressPatchingForHostOs()
+        {
+            return OperatingSystem.IsLinux() || OperatingSystem.IsMacOS() || OperatingSystem.IsIOS();
+        }
     }
 }

src/Ryujinx.Common/Collections/IntrusiveRedBlackTreeNode.cs

@@ -5,10 +5,10 @@ namespace Ryujinx.Common.Collections
     /// </summary>
     public class IntrusiveRedBlackTreeNode<T> where T : IntrusiveRedBlackTreeNode<T>
     {
-        internal bool Color = true;
-        internal T Left;
-        internal T Right;
-        internal T Parent;
+        public bool Color = true;
+        public T Left;
+        public T Right;
+        public T Parent;
 
         public T Predecessor => IntrusiveRedBlackTreeImpl<T>.PredecessorOf((T)this);
         public T Successor => IntrusiveRedBlackTreeImpl<T>.SuccessorOf((T)this);

src/Ryujinx.Cpu/AppleHv/HvMemoryBlockAllocator.cs

@@ -38,7 +38,7 @@ namespace Ryujinx.Cpu.AppleHv
 
         private readonly HvIpaAllocator _ipaAllocator;
 
-        public HvMemoryBlockAllocator(HvIpaAllocator ipaAllocator, int blockAlignment) : base(blockAlignment, MemoryAllocationFlags.None)
+        public HvMemoryBlockAllocator(HvIpaAllocator ipaAllocator, ulong blockAlignment) : base(blockAlignment, MemoryAllocationFlags.None)
         {
             _ipaAllocator = ipaAllocator;
         }

src/Ryujinx.Cpu/Jit/HostTracked/AddressIntrusiveRedBlackTree.cs

@@ -0,0 +1,35 @@
+using Ryujinx.Common.Collections;
+using System;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    internal class AddressIntrusiveRedBlackTree<T> : IntrusiveRedBlackTree<T> where T : IntrusiveRedBlackTreeNode<T>, IComparable<T>, IComparable<ulong>
+    {
+        /// <summary>
+        /// Retrieve the node that is considered equal to the specified address by the comparator.
+        /// </summary>
+        /// <param name="address">Address to compare with</param>
+        /// <returns>Node that is equal to <paramref name="address"/></returns>
+        public T GetNode(ulong address)
+        {
+            T node = Root;
+            while (node != null)
+            {
+                int cmp = node.CompareTo(address);
+                if (cmp < 0)
+                {
+                    node = node.Left;
+                }
+                else if (cmp > 0)
+                {
+                    node = node.Right;
+                }
+                else
+                {
+                    return node;
+                }
+            }
+            return null;
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/HostTracked/AddressSpacePartition.cs

@@ -0,0 +1,708 @@
+using Ryujinx.Common;
+using Ryujinx.Common.Collections;
+using Ryujinx.Memory;
+using System;
+using System.Diagnostics;
+using System.Threading;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    readonly struct PrivateRange
+    {
+        public readonly MemoryBlock Memory;
+        public readonly ulong Offset;
+        public readonly ulong Size;
+
+        public static PrivateRange Empty => new(null, 0, 0);
+
+        public PrivateRange(MemoryBlock memory, ulong offset, ulong size)
+        {
+            Memory = memory;
+            Offset = offset;
+            Size = size;
+        }
+    }
+
+    class AddressSpacePartition : IDisposable
+    {
+        public const ulong GuestPageSize = 0x1000;
+
+        private const int DefaultBlockAlignment = 1 << 20;
+
+        private enum MappingType : byte
+        {
+            None,
+            Private,
+        }
+
+        private class Mapping : IntrusiveRedBlackTreeNode<Mapping>, IComparable<Mapping>, IComparable<ulong>
+        {
+            public ulong Address { get; private set; }
+            public ulong Size { get; private set; }
+            public ulong EndAddress => Address + Size;
+            public MappingType Type { get; private set; }
+
+            public Mapping(ulong address, ulong size, MappingType type)
+            {
+                Address = address;
+                Size = size;
+                Type = type;
+            }
+
+            public Mapping Split(ulong splitAddress)
+            {
+                ulong leftSize = splitAddress - Address;
+                ulong rightSize = EndAddress - splitAddress;
+
+                Mapping left = new(Address, leftSize, Type);
+
+                Address = splitAddress;
+                Size = rightSize;
+
+                return left;
+            }
+
+            public void UpdateState(MappingType newType)
+            {
+                Type = newType;
+            }
+
+            public void Extend(ulong sizeDelta)
+            {
+                Size += sizeDelta;
+            }
+
+            public int CompareTo(Mapping other)
+            {
+                if (Address < other.Address)
+                {
+                    return -1;
+                }
+                else if (Address <= other.EndAddress - 1UL)
+                {
+                    return 0;
+                }
+                else
+                {
+                    return 1;
+                }
+            }
+
+            public int CompareTo(ulong address)
+            {
+                if (address < Address)
+                {
+                    return -1;
+                }
+                else if (address <= EndAddress - 1UL)
+                {
+                    return 0;
+                }
+                else
+                {
+                    return 1;
+                }
+            }
+        }
+
+        private class PrivateMapping : IntrusiveRedBlackTreeNode<PrivateMapping>, IComparable<PrivateMapping>, IComparable<ulong>
+        {
+            public ulong Address { get; private set; }
+            public ulong Size { get; private set; }
+            public ulong EndAddress => Address + Size;
+            public PrivateMemoryAllocation PrivateAllocation { get; private set; }
+
+            public PrivateMapping(ulong address, ulong size, PrivateMemoryAllocation privateAllocation)
+            {
+                Address = address;
+                Size = size;
+                PrivateAllocation = privateAllocation;
+            }
+
+            public PrivateMapping Split(ulong splitAddress)
+            {
+                ulong leftSize = splitAddress - Address;
+                ulong rightSize = EndAddress - splitAddress;
+
+                Debug.Assert(leftSize > 0);
+                Debug.Assert(rightSize > 0);
+
+                (var leftAllocation, PrivateAllocation) = PrivateAllocation.Split(leftSize);
+
+                PrivateMapping left = new(Address, leftSize, leftAllocation);
+
+                Address = splitAddress;
+                Size = rightSize;
+
+                return left;
+            }
+
+            public void Map(AddressSpacePartitionMultiAllocation baseBlock, ulong baseAddress, PrivateMemoryAllocation newAllocation)
+            {
+                baseBlock.MapView(newAllocation.Memory, newAllocation.Offset, Address - baseAddress, Size);
+                PrivateAllocation = newAllocation;
+            }
+
+            public void Unmap(AddressSpacePartitionMultiAllocation baseBlock, ulong baseAddress)
+            {
+                if (PrivateAllocation.IsValid)
+                {
+                    baseBlock.UnmapView(PrivateAllocation.Memory, Address - baseAddress, Size);
+                    PrivateAllocation.Dispose();
+                }
+
+                PrivateAllocation = default;
+            }
+
+            public void Extend(ulong sizeDelta)
+            {
+                Size += sizeDelta;
+            }
+
+            public int CompareTo(PrivateMapping other)
+            {
+                if (Address < other.Address)
+                {
+                    return -1;
+                }
+                else if (Address <= other.EndAddress - 1UL)
+                {
+                    return 0;
+                }
+                else
+                {
+                    return 1;
+                }
+            }
+
+            public int CompareTo(ulong address)
+            {
+                if (address < Address)
+                {
+                    return -1;
+                }
+                else if (address <= EndAddress - 1UL)
+                {
+                    return 0;
+                }
+                else
+                {
+                    return 1;
+                }
+            }
+        }
+
+        private readonly MemoryBlock _backingMemory;
+        private readonly AddressSpacePartitionMultiAllocation _baseMemory;
+        private readonly PrivateMemoryAllocator _privateMemoryAllocator;
+
+        private readonly AddressIntrusiveRedBlackTree<Mapping> _mappingTree;
+        private readonly AddressIntrusiveRedBlackTree<PrivateMapping> _privateTree;
+
+        private readonly ReaderWriterLockSlim _treeLock;
+
+        private readonly ulong _hostPageSize;
+
+        private ulong? _firstPagePa;
+        private ulong? _lastPagePa;
+        private ulong _cachedFirstPagePa;
+        private ulong _cachedLastPagePa;
+        private MemoryBlock _firstPageMemoryForUnmap;
+        private ulong _firstPageOffsetForLateMap;
+        private MemoryPermission _firstPageMemoryProtection;
+
+        public ulong Address { get; }
+        public ulong Size { get; }
+        public ulong EndAddress => Address + Size;
+
+        public AddressSpacePartition(AddressSpacePartitionAllocation baseMemory, MemoryBlock backingMemory, ulong address, ulong size)
+        {
+            _privateMemoryAllocator = new PrivateMemoryAllocator(DefaultBlockAlignment, MemoryAllocationFlags.Mirrorable);
+            _mappingTree = new AddressIntrusiveRedBlackTree<Mapping>();
+            _privateTree = new AddressIntrusiveRedBlackTree<PrivateMapping>();
+            _treeLock = new ReaderWriterLockSlim();
+
+            _mappingTree.Add(new Mapping(address, size, MappingType.None));
+            _privateTree.Add(new PrivateMapping(address, size, default));
+
+            _hostPageSize = MemoryBlock.GetPageSize();
+
+            _backingMemory = backingMemory;
+            _baseMemory = new(baseMemory);
+
+            _cachedFirstPagePa = ulong.MaxValue;
+            _cachedLastPagePa = ulong.MaxValue;
+
+            Address = address;
+            Size = size;
+        }
+
+        public bool IsEmpty()
+        {
+            _treeLock.EnterReadLock();
+
+            try
+            {
+                Mapping map = _mappingTree.GetNode(Address);
+
+                return map != null && map.Address == Address && map.Size == Size && map.Type == MappingType.None;
+            }
+            finally
+            {
+                _treeLock.ExitReadLock();
+            }
+        }
+
+        public void Map(ulong va, ulong pa, ulong size)
+        {
+            Debug.Assert(va >= Address);
+            Debug.Assert(va + size <= EndAddress);
+
+            if (va == Address)
+            {
+                _firstPagePa = pa;
+            }
+
+            if (va <= EndAddress - GuestPageSize && va + size > EndAddress - GuestPageSize)
+            {
+                _lastPagePa = pa + ((EndAddress - GuestPageSize) - va);
+            }
+
+            Update(va, pa, size, MappingType.Private);
+        }
+
+        public void Unmap(ulong va, ulong size)
+        {
+            Debug.Assert(va >= Address);
+            Debug.Assert(va + size <= EndAddress);
+
+            if (va == Address)
+            {
+                _firstPagePa = null;
+            }
+
+            if (va <= EndAddress - GuestPageSize && va + size > EndAddress - GuestPageSize)
+            {
+                _lastPagePa = null;
+            }
+
+            Update(va, 0UL, size, MappingType.None);
+        }
+
+        public void ReprotectAligned(ulong va, ulong size, MemoryPermission protection)
+        {
+            Debug.Assert(va >= Address);
+            Debug.Assert(va + size <= EndAddress);
+
+            _baseMemory.Reprotect(va - Address, size, protection, false);
+
+            if (va == Address)
+            {
+                _firstPageMemoryProtection = protection;
+            }
+        }
+
+        public void Reprotect(
+            ulong va,
+            ulong size,
+            MemoryPermission protection,
+            AddressSpacePartitioned addressSpace,
+            Action<ulong, IntPtr, ulong> updatePtCallback)
+        {
+            if (_baseMemory.LazyInitMirrorForProtection(addressSpace, Address, Size, protection))
+            {
+                LateMap();
+            }
+
+            updatePtCallback(va, _baseMemory.GetPointerForProtection(va - Address, size, protection), size);
+        }
+
+        public IntPtr GetPointer(ulong va, ulong size)
+        {
+            Debug.Assert(va >= Address);
+            Debug.Assert(va + size <= EndAddress);
+
+            return _baseMemory.GetPointer(va - Address, size);
+        }
+
+        public void InsertBridgeAtEnd(AddressSpacePartition partitionAfter, bool useProtectionMirrors)
+        {
+            ulong firstPagePa = partitionAfter?._firstPagePa ?? ulong.MaxValue;
+            ulong lastPagePa = _lastPagePa ?? ulong.MaxValue;
+
+            if (firstPagePa != _cachedFirstPagePa || lastPagePa != _cachedLastPagePa)
+            {
+                if (partitionAfter != null && partitionAfter._firstPagePa.HasValue)
+                {
+                    (MemoryBlock firstPageMemory, ulong firstPageOffset) = partitionAfter.GetFirstPageMemoryAndOffset();
+
+                    _baseMemory.MapView(firstPageMemory, firstPageOffset, Size, _hostPageSize);
+
+                    if (!useProtectionMirrors)
+                    {
+                        _baseMemory.Reprotect(Size, _hostPageSize, partitionAfter._firstPageMemoryProtection, throwOnFail: false);
+                    }
+
+                    _firstPageMemoryForUnmap = firstPageMemory;
+                    _firstPageOffsetForLateMap = firstPageOffset;
+                }
+                else
+                {
+                    MemoryBlock firstPageMemoryForUnmap = _firstPageMemoryForUnmap;
+
+                    if (firstPageMemoryForUnmap != null)
+                    {
+                        _baseMemory.UnmapView(firstPageMemoryForUnmap, Size, _hostPageSize);
+                        _firstPageMemoryForUnmap = null;
+                    }
+                }
+
+                _cachedFirstPagePa = firstPagePa;
+                _cachedLastPagePa = lastPagePa;
+            }
+        }
+
+        public void ReprotectBridge(MemoryPermission protection)
+        {
+            if (_firstPageMemoryForUnmap != null)
+            {
+                _baseMemory.Reprotect(Size, _hostPageSize, protection, throwOnFail: false);
+            }
+        }
+
+        private (MemoryBlock, ulong) GetFirstPageMemoryAndOffset()
+        {
+            _treeLock.EnterReadLock();
+
+            try
+            {
+                PrivateMapping map = _privateTree.GetNode(Address);
+
+                if (map != null && map.PrivateAllocation.IsValid)
+                {
+                    return (map.PrivateAllocation.Memory, map.PrivateAllocation.Offset + (Address - map.Address));
+                }
+            }
+            finally
+            {
+                _treeLock.ExitReadLock();
+            }
+
+            return (_backingMemory, _firstPagePa.Value);
+        }
+
+        public PrivateRange GetPrivateAllocation(ulong va)
+        {
+            _treeLock.EnterReadLock();
+
+            try
+            {
+                PrivateMapping map = _privateTree.GetNode(va);
+
+                if (map != null && map.PrivateAllocation.IsValid)
+                {
+                    return new(map.PrivateAllocation.Memory, map.PrivateAllocation.Offset + (va - map.Address), map.Size - (va - map.Address));
+                }
+            }
+            finally
+            {
+                _treeLock.ExitReadLock();
+            }
+
+            return PrivateRange.Empty;
+        }
+
+        private void Update(ulong va, ulong pa, ulong size, MappingType type)
+        {
+            _treeLock.EnterWriteLock();
+
+            try
+            {
+                Mapping map = _mappingTree.GetNode(va);
+
+                Update(map, va, pa, size, type);
+            }
+            finally
+            {
+                _treeLock.ExitWriteLock();
+            }
+        }
+
+        private Mapping Update(Mapping map, ulong va, ulong pa, ulong size, MappingType type)
+        {
+            ulong endAddress = va + size;
+
+            for (; map != null; map = map.Successor)
+            {
+                if (map.Address < va)
+                {
+                    _mappingTree.Add(map.Split(va));
+                }
+
+                if (map.EndAddress > endAddress)
+                {
+                    Mapping newMap = map.Split(endAddress);
+                    _mappingTree.Add(newMap);
+                    map = newMap;
+                }
+
+                switch (type)
+                {
+                    case MappingType.None:
+                        ulong alignment = _hostPageSize;
+
+                        bool unmappedBefore = map.Predecessor == null ||
+                            (map.Predecessor.Type == MappingType.None && map.Predecessor.Address <= BitUtils.AlignDown(va, alignment));
+
+                        bool unmappedAfter = map.Successor == null ||
+                            (map.Successor.Type == MappingType.None && map.Successor.EndAddress >= BitUtils.AlignUp(endAddress, alignment));
+
+                        UnmapPrivate(va, size, unmappedBefore, unmappedAfter);
+                        break;
+                    case MappingType.Private:
+                        MapPrivate(va, size);
+                        break;
+                }
+
+                map.UpdateState(type);
+                map = TryCoalesce(map);
+
+                if (map.EndAddress >= endAddress)
+                {
+                    break;
+                }
+            }
+
+            return map;
+        }
+
+        private Mapping TryCoalesce(Mapping map)
+        {
+            Mapping previousMap = map.Predecessor;
+            Mapping nextMap = map.Successor;
+
+            if (previousMap != null && CanCoalesce(previousMap, map))
+            {
+                previousMap.Extend(map.Size);
+                _mappingTree.Remove(map);
+                map = previousMap;
+            }
+
+            if (nextMap != null && CanCoalesce(map, nextMap))
+            {
+                map.Extend(nextMap.Size);
+                _mappingTree.Remove(nextMap);
+            }
+
+            return map;
+        }
+
+        private static bool CanCoalesce(Mapping left, Mapping right)
+        {
+            return left.Type == right.Type;
+        }
+
+        private void MapPrivate(ulong va, ulong size)
+        {
+            ulong endAddress = va + size;
+
+            ulong alignment = _hostPageSize;
+
+            // Expand the range outwards based on page size to ensure that at least the requested region is mapped.
+            ulong vaAligned = BitUtils.AlignDown(va, alignment);
+            ulong endAddressAligned = BitUtils.AlignUp(endAddress, alignment);
+
+            PrivateMapping map = _privateTree.GetNode(va);
+
+            for (; map != null; map = map.Successor)
+            {
+                if (!map.PrivateAllocation.IsValid)
+                {
+                    if (map.Address < vaAligned)
+                    {
+                        _privateTree.Add(map.Split(vaAligned));
+                    }
+
+                    if (map.EndAddress > endAddressAligned)
+                    {
+                        PrivateMapping newMap = map.Split(endAddressAligned);
+                        _privateTree.Add(newMap);
+                        map = newMap;
+                    }
+
+                    map.Map(_baseMemory, Address, _privateMemoryAllocator.Allocate(map.Size, _hostPageSize));
+                }
+
+                if (map.EndAddress >= endAddressAligned)
+                {
+                    break;
+                }
+            }
+        }
+
+        private void UnmapPrivate(ulong va, ulong size, bool unmappedBefore, bool unmappedAfter)
+        {
+            ulong endAddress = va + size;
+
+            ulong alignment = _hostPageSize;
+
+            // If the adjacent mappings are unmapped, expand the range outwards,
+            // otherwise shrink it inwards. We must ensure we won't unmap pages that might still be in use.
+            ulong vaAligned = unmappedBefore ? BitUtils.AlignDown(va, alignment) : BitUtils.AlignUp(va, alignment);
+            ulong endAddressAligned = unmappedAfter ? BitUtils.AlignUp(endAddress, alignment) : BitUtils.AlignDown(endAddress, alignment);
+
+            if (endAddressAligned <= vaAligned)
+            {
+                return;
+            }
+
+            PrivateMapping map = _privateTree.GetNode(vaAligned);
+
+            for (; map != null; map = map.Successor)
+            {
+                if (map.PrivateAllocation.IsValid)
+                {
+                    if (map.Address < vaAligned)
+                    {
+                        _privateTree.Add(map.Split(vaAligned));
+                    }
+
+                    if (map.EndAddress > endAddressAligned)
+                    {
+                        PrivateMapping newMap = map.Split(endAddressAligned);
+                        _privateTree.Add(newMap);
+                        map = newMap;
+                    }
+
+                    map.Unmap(_baseMemory, Address);
+                    map = TryCoalesce(map);
+                }
+
+                if (map.EndAddress >= endAddressAligned)
+                {
+                    break;
+                }
+            }
+        }
+
+        private PrivateMapping TryCoalesce(PrivateMapping map)
+        {
+            PrivateMapping previousMap = map.Predecessor;
+            PrivateMapping nextMap = map.Successor;
+
+            if (previousMap != null && CanCoalesce(previousMap, map))
+            {
+                previousMap.Extend(map.Size);
+                _privateTree.Remove(map);
+                map = previousMap;
+            }
+
+            if (nextMap != null && CanCoalesce(map, nextMap))
+            {
+                map.Extend(nextMap.Size);
+                _privateTree.Remove(nextMap);
+            }
+
+            return map;
+        }
+
+        private static bool CanCoalesce(PrivateMapping left, PrivateMapping right)
+        {
+            return !left.PrivateAllocation.IsValid && !right.PrivateAllocation.IsValid;
+        }
+
+        private void LateMap()
+        {
+            // Map all existing private allocations.
+            // This is necessary to ensure mirrors that are lazily created have the same mappings as the main one.
+
+            PrivateMapping map = _privateTree.GetNode(Address);
+
+            for (; map != null; map = map.Successor)
+            {
+                if (map.PrivateAllocation.IsValid)
+                {
+                    _baseMemory.LateMapView(map.PrivateAllocation.Memory, map.PrivateAllocation.Offset, map.Address - Address, map.Size);
+                }
+            }
+
+            MemoryBlock firstPageMemory = _firstPageMemoryForUnmap;
+            ulong firstPageOffset = _firstPageOffsetForLateMap;
+
+            if (firstPageMemory != null)
+            {
+                _baseMemory.LateMapView(firstPageMemory, firstPageOffset, Size, _hostPageSize);
+            }
+        }
+
+        public PrivateRange GetFirstPrivateAllocation(ulong va, ulong size, out ulong nextVa)
+        {
+            _treeLock.EnterReadLock();
+
+            try
+            {
+                PrivateMapping map = _privateTree.GetNode(va);
+
+                nextVa = map.EndAddress;
+
+                if (map != null && map.PrivateAllocation.IsValid)
+                {
+                    ulong startOffset = va - map.Address;
+
+                    return new(
+                        map.PrivateAllocation.Memory,
+                        map.PrivateAllocation.Offset + startOffset,
+                        Math.Min(map.PrivateAllocation.Size - startOffset, size));
+                }
+            }
+            finally
+            {
+                _treeLock.ExitReadLock();
+            }
+
+            return PrivateRange.Empty;
+        }
+
+        public bool HasPrivateAllocation(ulong va, ulong size, ulong startVa, ulong startSize, ref PrivateRange range)
+        {
+            ulong endVa = va + size;
+
+            _treeLock.EnterReadLock();
+
+            try
+            {
+                for (PrivateMapping map = _privateTree.GetNode(va); map != null && map.Address < endVa; map = map.Successor)
+                {
+                    if (map.PrivateAllocation.IsValid)
+                    {
+                        if (map.Address <= startVa && map.EndAddress >= startVa + startSize)
+                        {
+                            ulong startOffset = startVa - map.Address;
+
+                            range = new(
+                                map.PrivateAllocation.Memory,
+                                map.PrivateAllocation.Offset + startOffset,
+                                Math.Min(map.PrivateAllocation.Size - startOffset, startSize));
+                        }
+
+                        return true;
+                    }
+                }
+            }
+            finally
+            {
+                _treeLock.ExitReadLock();
+            }
+
+            return false;
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+
+            _privateMemoryAllocator.Dispose();
+            _baseMemory.Dispose();
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/HostTracked/AddressSpacePartitionAllocator.cs

@@ -0,0 +1,202 @@
+using Ryujinx.Common;
+using Ryujinx.Common.Collections;
+using Ryujinx.Memory;
+using Ryujinx.Memory.Tracking;
+using System;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    readonly struct AddressSpacePartitionAllocation : IDisposable
+    {
+        private readonly AddressSpacePartitionAllocator _owner;
+        private readonly PrivateMemoryAllocatorImpl<AddressSpacePartitionAllocator.Block>.Allocation _allocation;
+
+        public IntPtr Pointer => (IntPtr)((ulong)_allocation.Block.Memory.Pointer + _allocation.Offset);
+
+        public bool IsValid => _owner != null;
+
+        public AddressSpacePartitionAllocation(
+            AddressSpacePartitionAllocator owner,
+            PrivateMemoryAllocatorImpl<AddressSpacePartitionAllocator.Block>.Allocation allocation)
+        {
+            _owner = owner;
+            _allocation = allocation;
+        }
+
+        public void RegisterMapping(ulong va, ulong endVa)
+        {
+            _allocation.Block.AddMapping(_allocation.Offset, _allocation.Size, va, endVa);
+        }
+
+        public void MapView(MemoryBlock srcBlock, ulong srcOffset, ulong dstOffset, ulong size)
+        {
+            _allocation.Block.Memory.MapView(srcBlock, srcOffset, _allocation.Offset + dstOffset, size);
+        }
+
+        public void UnmapView(MemoryBlock srcBlock, ulong offset, ulong size)
+        {
+            _allocation.Block.Memory.UnmapView(srcBlock, _allocation.Offset + offset, size);
+        }
+
+        public void Reprotect(ulong offset, ulong size, MemoryPermission permission, bool throwOnFail)
+        {
+            _allocation.Block.Memory.Reprotect(_allocation.Offset + offset, size, permission, throwOnFail);
+        }
+
+        public IntPtr GetPointer(ulong offset, ulong size)
+        {
+            return _allocation.Block.Memory.GetPointer(_allocation.Offset + offset, size);
+        }
+
+        public void Dispose()
+        {
+            _allocation.Block.RemoveMapping(_allocation.Offset, _allocation.Size);
+            _owner.Free(_allocation.Block, _allocation.Offset, _allocation.Size);
+        }
+    }
+
+    class AddressSpacePartitionAllocator : PrivateMemoryAllocatorImpl<AddressSpacePartitionAllocator.Block>
+    {
+        private const ulong DefaultBlockAlignment = 1UL << 32; // 4GB
+
+        public class Block : PrivateMemoryAllocator.Block
+        {
+            private readonly MemoryTracking _tracking;
+            private readonly Func<ulong, ulong> _readPtCallback;
+            private readonly MemoryEhMeilleure _memoryEh;
+
+            private class Mapping : IntrusiveRedBlackTreeNode<Mapping>, IComparable<Mapping>, IComparable<ulong>
+            {
+                public ulong Address { get; }
+                public ulong Size { get; }
+                public ulong EndAddress => Address + Size;
+                public ulong Va { get; }
+                public ulong EndVa { get; }
+
+                public Mapping(ulong address, ulong size, ulong va, ulong endVa)
+                {
+                    Address = address;
+                    Size = size;
+                    Va = va;
+                    EndVa = endVa;
+                }
+
+                public int CompareTo(Mapping other)
+                {
+                    if (Address < other.Address)
+                    {
+                        return -1;
+                    }
+                    else if (Address <= other.EndAddress - 1UL)
+                    {
+                        return 0;
+                    }
+                    else
+                    {
+                        return 1;
+                    }
+                }
+
+                public int CompareTo(ulong address)
+                {
+                    if (address < Address)
+                    {
+                        return -1;
+                    }
+                    else if (address <= EndAddress - 1UL)
+                    {
+                        return 0;
+                    }
+                    else
+                    {
+                        return 1;
+                    }
+                }
+            }
+
+            private readonly AddressIntrusiveRedBlackTree<Mapping> _mappingTree;
+            private readonly object _lock;
+
+            public Block(MemoryTracking tracking, Func<ulong, ulong> readPtCallback, MemoryBlock memory, ulong size, object locker) : base(memory, size)
+            {
+                _tracking = tracking;
+                _readPtCallback = readPtCallback;
+                _memoryEh = new(memory, null, tracking, VirtualMemoryEvent);
+                _mappingTree = new();
+                _lock = locker;
+            }
+
+            public void AddMapping(ulong offset, ulong size, ulong va, ulong endVa)
+            {
+                _mappingTree.Add(new(offset, size, va, endVa));
+            }
+
+            public void RemoveMapping(ulong offset, ulong size)
+            {
+                _mappingTree.Remove(_mappingTree.GetNode(offset));
+            }
+
+            private ulong VirtualMemoryEvent(ulong address, ulong size, bool write)
+            {
+                Mapping map;
+
+                lock (_lock)
+                {
+                    map = _mappingTree.GetNode(address);
+                }
+
+                if (map == null)
+                {
+                    return 0;
+                }
+
+                address -= map.Address;
+
+                ulong addressAligned = BitUtils.AlignDown(address, AddressSpacePartition.GuestPageSize);
+                ulong endAddressAligned = BitUtils.AlignUp(address + size, AddressSpacePartition.GuestPageSize);
+                ulong sizeAligned = endAddressAligned - addressAligned;
+
+                if (!_tracking.VirtualMemoryEvent(map.Va + addressAligned, sizeAligned, write))
+                {
+                    return 0;
+                }
+
+                return _readPtCallback(map.Va + address);
+            }
+
+            public override void Destroy()
+            {
+                _memoryEh.Dispose();
+
+                base.Destroy();
+            }
+        }
+
+        private readonly MemoryTracking _tracking;
+        private readonly Func<ulong, ulong> _readPtCallback;
+        private readonly object _lock;
+
+        public AddressSpacePartitionAllocator(
+            MemoryTracking tracking,
+            Func<ulong, ulong> readPtCallback,
+            object locker) : base(DefaultBlockAlignment, MemoryAllocationFlags.Reserve | MemoryAllocationFlags.ViewCompatible)
+        {
+            _tracking = tracking;
+            _readPtCallback = readPtCallback;
+            _lock = locker;
+        }
+
+        public AddressSpacePartitionAllocation Allocate(ulong va, ulong size)
+        {
+            AddressSpacePartitionAllocation allocation = new(this, Allocate(size, MemoryBlock.GetPageSize(), CreateBlock));
+            allocation.RegisterMapping(va, va + size);
+
+            return allocation;
+        }
+
+        private Block CreateBlock(MemoryBlock memory, ulong size)
+        {
+            return new Block(_tracking, _readPtCallback, memory, size, _lock);
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/HostTracked/AddressSpacePartitionMultiAllocation.cs

@@ -0,0 +1,101 @@
+using Ryujinx.Memory;
+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    class AddressSpacePartitionMultiAllocation : IDisposable
+    {
+        private readonly AddressSpacePartitionAllocation _baseMemory;
+        private AddressSpacePartitionAllocation _baseMemoryRo;
+        private AddressSpacePartitionAllocation _baseMemoryNone;
+
+        public AddressSpacePartitionMultiAllocation(AddressSpacePartitionAllocation baseMemory)
+        {
+            _baseMemory = baseMemory;
+        }
+
+        public void MapView(MemoryBlock srcBlock, ulong srcOffset, ulong dstOffset, ulong size)
+        {
+            _baseMemory.MapView(srcBlock, srcOffset, dstOffset, size);
+
+            if (_baseMemoryRo.IsValid)
+            {
+                _baseMemoryRo.MapView(srcBlock, srcOffset, dstOffset, size);
+                _baseMemoryRo.Reprotect(dstOffset, size, MemoryPermission.Read, false);
+            }
+        }
+
+        public void LateMapView(MemoryBlock srcBlock, ulong srcOffset, ulong dstOffset, ulong size)
+        {
+            _baseMemoryRo.MapView(srcBlock, srcOffset, dstOffset, size);
+            _baseMemoryRo.Reprotect(dstOffset, size, MemoryPermission.Read, false);
+        }
+
+        public void UnmapView(MemoryBlock srcBlock, ulong offset, ulong size)
+        {
+            _baseMemory.UnmapView(srcBlock, offset, size);
+
+            if (_baseMemoryRo.IsValid)
+            {
+                _baseMemoryRo.UnmapView(srcBlock, offset, size);
+            }
+        }
+
+        public void Reprotect(ulong offset, ulong size, MemoryPermission permission, bool throwOnFail)
+        {
+            _baseMemory.Reprotect(offset, size, permission, throwOnFail);
+        }
+
+        public IntPtr GetPointer(ulong offset, ulong size)
+        {
+            return _baseMemory.GetPointer(offset, size);
+        }
+
+        public bool LazyInitMirrorForProtection(AddressSpacePartitioned addressSpace, ulong blockAddress, ulong blockSize, MemoryPermission permission)
+        {
+            if (permission == MemoryPermission.None && !_baseMemoryNone.IsValid)
+            {
+                _baseMemoryNone = addressSpace.CreateAsPartitionAllocation(blockAddress, blockSize);
+            }
+            else if (permission == MemoryPermission.Read && !_baseMemoryRo.IsValid)
+            {
+                _baseMemoryRo = addressSpace.CreateAsPartitionAllocation(blockAddress, blockSize);
+
+                return true;
+            }
+
+            return false;
+        }
+
+        public IntPtr GetPointerForProtection(ulong offset, ulong size, MemoryPermission permission)
+        {
+            AddressSpacePartitionAllocation allocation = permission switch
+            {
+                MemoryPermission.ReadAndWrite => _baseMemory,
+                MemoryPermission.Read => _baseMemoryRo,
+                MemoryPermission.None => _baseMemoryNone,
+                _ => throw new ArgumentException($"Invalid protection \"{permission}\"."),
+            };
+
+            Debug.Assert(allocation.IsValid);
+
+            return allocation.GetPointer(offset, size);
+        }
+
+        public void Dispose()
+        {
+            _baseMemory.Dispose();
+
+            if (_baseMemoryRo.IsValid)
+            {
+                _baseMemoryRo.Dispose();
+            }
+
+            if (_baseMemoryNone.IsValid)
+            {
+                _baseMemoryNone.Dispose();
+            }
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/HostTracked/AddressSpacePartitioned.cs

@@ -0,0 +1,407 @@
+using Ryujinx.Common;
+using Ryujinx.Memory;
+using Ryujinx.Memory.Tracking;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    class AddressSpacePartitioned : IDisposable
+    {
+        private const int PartitionBits = 25;
+        private const ulong PartitionSize = 1UL << PartitionBits;
+
+        private readonly MemoryBlock _backingMemory;
+        private readonly List<AddressSpacePartition> _partitions;
+        private readonly AddressSpacePartitionAllocator _asAllocator;
+        private readonly Action<ulong, IntPtr, ulong> _updatePtCallback;
+        private readonly bool _useProtectionMirrors;
+
+        public AddressSpacePartitioned(MemoryTracking tracking, MemoryBlock backingMemory, NativePageTable nativePageTable, bool useProtectionMirrors)
+        {
+            _backingMemory = backingMemory;
+            _partitions = new();
+            _asAllocator = new(tracking, nativePageTable.Read, _partitions);
+            _updatePtCallback = nativePageTable.Update;
+            _useProtectionMirrors = useProtectionMirrors;
+        }
+
+        public void Map(ulong va, ulong pa, ulong size)
+        {
+            ulong endVa = va + size;
+
+            lock (_partitions)
+            {
+                EnsurePartitionsLocked(va, size);
+
+                while (va < endVa)
+                {
+                    int partitionIndex = FindPartitionIndexLocked(va);
+                    AddressSpacePartition partition = _partitions[partitionIndex];
+
+                    (ulong clampedVa, ulong clampedEndVa) = ClampRange(partition, va, endVa);
+
+                    partition.Map(clampedVa, pa, clampedEndVa - clampedVa);
+
+                    ulong currentSize = clampedEndVa - clampedVa;
+
+                    va += currentSize;
+                    pa += currentSize;
+
+                    InsertOrRemoveBridgeIfNeeded(partitionIndex);
+                }
+            }
+        }
+
+        public void Unmap(ulong va, ulong size)
+        {
+            ulong endVa = va + size;
+
+            while (va < endVa)
+            {
+                AddressSpacePartition partition;
+
+                lock (_partitions)
+                {
+                    int partitionIndex = FindPartitionIndexLocked(va);
+                    if (partitionIndex < 0)
+                    {
+                        va += PartitionSize - (va & (PartitionSize - 1));
+
+                        continue;
+                    }
+
+                    partition = _partitions[partitionIndex];
+
+                    (ulong clampedVa, ulong clampedEndVa) = ClampRange(partition, va, endVa);
+
+                    partition.Unmap(clampedVa, clampedEndVa - clampedVa);
+
+                    va += clampedEndVa - clampedVa;
+
+                    InsertOrRemoveBridgeIfNeeded(partitionIndex);
+
+                    if (partition.IsEmpty())
+                    {
+                        _partitions.Remove(partition);
+                        partition.Dispose();
+                    }
+                }
+            }
+        }
+
+        public void Reprotect(ulong va, ulong size, MemoryPermission protection)
+        {
+            ulong endVa = va + size;
+
+            lock (_partitions)
+            {
+                while (va < endVa)
+                {
+                    AddressSpacePartition partition = FindPartitionWithIndex(va, out int partitionIndex);
+
+                    if (partition == null)
+                    {
+                        va += PartitionSize - (va & (PartitionSize - 1));
+
+                        continue;
+                    }
+
+                    (ulong clampedVa, ulong clampedEndVa) = ClampRange(partition, va, endVa);
+
+                    if (_useProtectionMirrors)
+                    {
+                        partition.Reprotect(clampedVa, clampedEndVa - clampedVa, protection, this, _updatePtCallback);
+                    }
+                    else
+                    {
+                        partition.ReprotectAligned(clampedVa, clampedEndVa - clampedVa, protection);
+
+                        if (clampedVa == partition.Address &&
+                            partitionIndex > 0 &&
+                            _partitions[partitionIndex - 1].EndAddress == partition.Address)
+                        {
+                            _partitions[partitionIndex - 1].ReprotectBridge(protection);
+                        }
+                    }
+
+                    va += clampedEndVa - clampedVa;
+                }
+            }
+        }
+
+        public PrivateRange GetPrivateAllocation(ulong va)
+        {
+            AddressSpacePartition partition = FindPartition(va);
+
+            if (partition == null)
+            {
+                return PrivateRange.Empty;
+            }
+
+            return partition.GetPrivateAllocation(va);
+        }
+
+        public PrivateRange GetFirstPrivateAllocation(ulong va, ulong size, out ulong nextVa)
+        {
+            AddressSpacePartition partition = FindPartition(va);
+
+            if (partition == null)
+            {
+                nextVa = (va & ~(PartitionSize - 1)) + PartitionSize;
+
+                return PrivateRange.Empty;
+            }
+
+            return partition.GetFirstPrivateAllocation(va, size, out nextVa);
+        }
+
+        public bool HasAnyPrivateAllocation(ulong va, ulong size, out PrivateRange range)
+        {
+            range = PrivateRange.Empty;
+
+            ulong startVa = va;
+            ulong endVa = va + size;
+
+            while (va < endVa)
+            {
+                AddressSpacePartition partition = FindPartition(va);
+
+                if (partition == null)
+                {
+                    va += PartitionSize - (va & (PartitionSize - 1));
+
+                    continue;
+                }
+
+                (ulong clampedVa, ulong clampedEndVa) = ClampRange(partition, va, endVa);
+
+                if (partition.HasPrivateAllocation(clampedVa, clampedEndVa - clampedVa, startVa, size, ref range))
+                {
+                    return true;
+                }
+
+                va += clampedEndVa - clampedVa;
+            }
+
+            return false;
+        }
+
+        private void InsertOrRemoveBridgeIfNeeded(int partitionIndex)
+        {
+            if (partitionIndex > 0)
+            {
+                if (_partitions[partitionIndex - 1].EndAddress == _partitions[partitionIndex].Address)
+                {
+                    _partitions[partitionIndex - 1].InsertBridgeAtEnd(_partitions[partitionIndex], _useProtectionMirrors);
+                }
+                else
+                {
+                    _partitions[partitionIndex - 1].InsertBridgeAtEnd(null, _useProtectionMirrors);
+                }
+            }
+
+            if (partitionIndex + 1 < _partitions.Count && _partitions[partitionIndex].EndAddress == _partitions[partitionIndex + 1].Address)
+            {
+                _partitions[partitionIndex].InsertBridgeAtEnd(_partitions[partitionIndex + 1], _useProtectionMirrors);
+            }
+            else
+            {
+                _partitions[partitionIndex].InsertBridgeAtEnd(null, _useProtectionMirrors);
+            }
+        }
+
+        public IntPtr GetPointer(ulong va, ulong size)
+        {
+            AddressSpacePartition partition = FindPartition(va);
+
+            return partition.GetPointer(va, size);
+        }
+
+        private static (ulong, ulong) ClampRange(AddressSpacePartition partition, ulong va, ulong endVa)
+        {
+            if (va < partition.Address)
+            {
+                va = partition.Address;
+            }
+
+            if (endVa > partition.EndAddress)
+            {
+                endVa = partition.EndAddress;
+            }
+
+            return (va, endVa);
+        }
+
+        private AddressSpacePartition FindPartition(ulong va)
+        {
+            lock (_partitions)
+            {
+                int index = FindPartitionIndexLocked(va);
+                if (index >= 0)
+                {
+                    return _partitions[index];
+                }
+            }
+
+            return null;
+        }
+
+        private AddressSpacePartition FindPartitionWithIndex(ulong va, out int index)
+        {
+            lock (_partitions)
+            {
+                index = FindPartitionIndexLocked(va);
+                if (index >= 0)
+                {
+                    return _partitions[index];
+                }
+            }
+
+            return null;
+        }
+
+        private int FindPartitionIndexLocked(ulong va)
+        {
+            int left = 0;
+            int middle;
+            int right = _partitions.Count - 1;
+
+            while (left <= right)
+            {
+                middle = left + ((right - left) >> 1);
+
+                AddressSpacePartition partition = _partitions[middle];
+
+                if (partition.Address <= va && partition.EndAddress > va)
+                {
+                    return middle;
+                }
+
+                if (partition.Address >= va)
+                {
+                    right = middle - 1;
+                }
+                else
+                {
+                    left = middle + 1;
+                }
+            }
+
+            return -1;
+        }
+
+        private void EnsurePartitionsLocked(ulong va, ulong size)
+        {
+            ulong endVa = BitUtils.AlignUp(va + size, PartitionSize);
+            va = BitUtils.AlignDown(va, PartitionSize);
+
+            for (int i = 0; i < _partitions.Count && va < endVa; i++)
+            {
+                AddressSpacePartition partition = _partitions[i];
+
+                if (partition.Address <= va && partition.EndAddress > va)
+                {
+                    if (partition.EndAddress >= endVa)
+                    {
+                        // Fully mapped already.
+                        va = endVa;
+
+                        break;
+                    }
+
+                    ulong gapSize;
+
+                    if (i + 1 < _partitions.Count)
+                    {
+                        AddressSpacePartition nextPartition = _partitions[i + 1];
+
+                        if (partition.EndAddress == nextPartition.Address)
+                        {
+                            va = partition.EndAddress;
+
+                            continue;
+                        }
+
+                        gapSize = Math.Min(endVa, nextPartition.Address) - partition.EndAddress;
+                    }
+                    else
+                    {
+                        gapSize = endVa - partition.EndAddress;
+                    }
+
+                    _partitions.Insert(i + 1, CreateAsPartition(partition.EndAddress, gapSize));
+                    va = partition.EndAddress + gapSize;
+                    i++;
+                }
+                else if (partition.EndAddress > va)
+                {
+                    Debug.Assert(partition.Address > va);
+
+                    ulong gapSize;
+
+                    if (partition.Address < endVa)
+                    {
+                        gapSize = partition.Address - va;
+                    }
+                    else
+                    {
+                        gapSize = endVa - va;
+                    }
+
+                    _partitions.Insert(i, CreateAsPartition(va, gapSize));
+                    va = Math.Min(partition.EndAddress, endVa);
+                    i++;
+                }
+            }
+
+            if (va < endVa)
+            {
+                _partitions.Add(CreateAsPartition(va, endVa - va));
+            }
+
+            ValidatePartitionList();
+        }
+
+        [Conditional("DEBUG")]
+        private void ValidatePartitionList()
+        {
+            for (int i = 1; i < _partitions.Count; i++)
+            {
+                Debug.Assert(_partitions[i].Address > _partitions[i - 1].Address);
+                Debug.Assert(_partitions[i].EndAddress > _partitions[i - 1].EndAddress);
+            }
+        }
+
+        private AddressSpacePartition CreateAsPartition(ulong va, ulong size)
+        {
+            return new(CreateAsPartitionAllocation(va, size), _backingMemory, va, size);
+        }
+
+        public AddressSpacePartitionAllocation CreateAsPartitionAllocation(ulong va, ulong size)
+        {
+            return _asAllocator.Allocate(va, size + MemoryBlock.GetPageSize());
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                foreach (AddressSpacePartition partition in _partitions)
+                {
+                    partition.Dispose();
+                }
+
+                _partitions.Clear();
+                _asAllocator.Dispose();
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/HostTracked/NativePageTable.cs

@@ -0,0 +1,223 @@
+using Ryujinx.Cpu.Signal;
+using Ryujinx.Memory;
+using System;
+using System.Diagnostics;
+using System.Numerics;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Cpu.Jit.HostTracked
+{
+    sealed class NativePageTable : IDisposable
+    {
+        private delegate ulong TrackingEventDelegate(ulong address, ulong size, bool write);
+
+        private const int PageBits = 12;
+        private const int PageSize = 1 << PageBits;
+        private const int PageMask = PageSize - 1;
+
+        private const int PteSize = 8;
+
+        private readonly int _bitsPerPtPage;
+        private readonly int _entriesPerPtPage;
+        private readonly int _pageCommitmentBits;
+
+        private readonly PageTable<ulong> _pageTable;
+        private readonly MemoryBlock _nativePageTable;
+        private readonly ulong[] _pageCommitmentBitmap;
+        private readonly ulong _hostPageSize;
+
+        private readonly TrackingEventDelegate _trackingEvent;
+
+        private bool _disposed;
+
+        public IntPtr PageTablePointer => _nativePageTable.Pointer;
+
+        public NativePageTable(ulong asSize)
+        {
+            ulong hostPageSize = MemoryBlock.GetPageSize();
+
+            _entriesPerPtPage = (int)(hostPageSize / sizeof(ulong));
+            _bitsPerPtPage = BitOperations.Log2((uint)_entriesPerPtPage);
+            _pageCommitmentBits = PageBits + _bitsPerPtPage;
+
+            _hostPageSize = hostPageSize;
+            _pageTable = new PageTable<ulong>();
+            _nativePageTable = new MemoryBlock((asSize / PageSize) * PteSize + _hostPageSize, MemoryAllocationFlags.Reserve);
+            _pageCommitmentBitmap = new ulong[(asSize >> _pageCommitmentBits) / (sizeof(ulong) * 8)];
+
+            ulong ptStart = (ulong)_nativePageTable.Pointer;
+            ulong ptEnd = ptStart + _nativePageTable.Size;
+
+            _trackingEvent = VirtualMemoryEvent;
+
+            bool added = NativeSignalHandler.AddTrackedRegion((nuint)ptStart, (nuint)ptEnd, Marshal.GetFunctionPointerForDelegate(_trackingEvent));
+
+            if (!added)
+            {
+                throw new InvalidOperationException("Number of allowed tracked regions exceeded.");
+            }
+        }
+
+        public void Map(ulong va, ulong pa, ulong size, AddressSpacePartitioned addressSpace, MemoryBlock backingMemory, bool privateMap)
+        {
+            while (size != 0)
+            {
+                _pageTable.Map(va, pa);
+
+                EnsureCommitment(va);
+
+                if (privateMap)
+                {
+                    _nativePageTable.Write((va / PageSize) * PteSize, GetPte(va, addressSpace.GetPointer(va, PageSize)));
+                }
+                else
+                {
+                    _nativePageTable.Write((va / PageSize) * PteSize, GetPte(va, backingMemory.GetPointer(pa, PageSize)));
+                }
+
+                va += PageSize;
+                pa += PageSize;
+                size -= PageSize;
+            }
+        }
+
+        public void Unmap(ulong va, ulong size)
+        {
+            IntPtr guardPagePtr = GetGuardPagePointer();
+
+            while (size != 0)
+            {
+                _pageTable.Unmap(va);
+                _nativePageTable.Write((va / PageSize) * PteSize, GetPte(va, guardPagePtr));
+
+                va += PageSize;
+                size -= PageSize;
+            }
+        }
+
+        public ulong Read(ulong va)
+        {
+            ulong pte = _nativePageTable.Read<ulong>((va / PageSize) * PteSize);
+
+            pte += va & ~(ulong)PageMask;
+
+            return pte + (va & PageMask);
+        }
+
+        public void Update(ulong va, IntPtr ptr, ulong size)
+        {
+            ulong remainingSize = size;
+
+            while (remainingSize != 0)
+            {
+                EnsureCommitment(va);
+
+                _nativePageTable.Write((va / PageSize) * PteSize, GetPte(va, ptr));
+
+                va += PageSize;
+                ptr += PageSize;
+                remainingSize -= PageSize;
+            }
+        }
+
+        private void EnsureCommitment(ulong va)
+        {
+            ulong bit = va >> _pageCommitmentBits;
+
+            int index = (int)(bit / (sizeof(ulong) * 8));
+            int shift = (int)(bit % (sizeof(ulong) * 8));
+
+            ulong mask = 1UL << shift;
+
+            ulong oldMask = _pageCommitmentBitmap[index];
+
+            if ((oldMask & mask) == 0)
+            {
+                lock (_pageCommitmentBitmap)
+                {
+                    oldMask = _pageCommitmentBitmap[index];
+
+                    if ((oldMask & mask) != 0)
+                    {
+                        return;
+                    }
+
+                    _nativePageTable.Commit(bit * _hostPageSize, _hostPageSize);
+
+                    Span<ulong> pageSpan = MemoryMarshal.Cast<byte, ulong>(_nativePageTable.GetSpan(bit * _hostPageSize, (int)_hostPageSize));
+
+                    Debug.Assert(pageSpan.Length == _entriesPerPtPage);
+
+                    IntPtr guardPagePtr = GetGuardPagePointer();
+
+                    for (int i = 0; i < pageSpan.Length; i++)
+                    {
+                        pageSpan[i] = GetPte((bit << _pageCommitmentBits) | ((ulong)i * PageSize), guardPagePtr);
+                    }
+
+                    _pageCommitmentBitmap[index] = oldMask | mask;
+                }
+            }
+        }
+
+        private IntPtr GetGuardPagePointer()
+        {
+            return _nativePageTable.GetPointer(_nativePageTable.Size - _hostPageSize, _hostPageSize);
+        }
+
+        private static ulong GetPte(ulong va, IntPtr ptr)
+        {
+            Debug.Assert((va & PageMask) == 0);
+
+            return (ulong)ptr - va;
+        }
+
+        public ulong GetPhysicalAddress(ulong va)
+        {
+            return _pageTable.Read(va) + (va & PageMask);
+        }
+
+        private ulong VirtualMemoryEvent(ulong address, ulong size, bool write)
+        {
+            if (address < _nativePageTable.Size - _hostPageSize)
+            {
+                // Some prefetch instructions do not cause faults with invalid addresses.
+                // Retry if we are hitting a case where the page table is unmapped, the next
+                // run will execute the actual instruction.
+                // The address loaded from the page table will be invalid, and it should hit the else case
+                // if the instruction faults on unmapped or protected memory.
+
+                ulong va = address * (PageSize / sizeof(ulong));
+
+                EnsureCommitment(va);
+
+                return (ulong)_nativePageTable.Pointer + address;
+            }
+            else
+            {
+                throw new InvalidMemoryRegionException();
+            }
+        }
+
+        private void Dispose(bool disposing)
+        {
+            if (!_disposed)
+            {
+                if (disposing)
+                {
+                    NativeSignalHandler.RemoveTrackedRegion((nuint)_nativePageTable.Pointer);
+
+                    _nativePageTable.Dispose();
+                }
+
+                _disposed = true;
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}

src/Ryujinx.Cpu/Jit/JitCpuContext.cs

@@ -15,9 +15,9 @@ namespace Ryujinx.Cpu.Jit
             _tickSource = tickSource;
             _translator = new Translator(new JitMemoryAllocator(forJit: true), memory, for64Bit);
 
-            if (memory.Type.IsHostMapped())
+            if (memory.Type.IsHostMappedOrTracked())
             {
-                NativeSignalHandler.InitializeSignalHandler(MemoryBlock.GetPageSize());
+                NativeSignalHandler.InitializeSignalHandler();
             }
 
             memory.UnmapEvent += UnmapHandler;

src/Ryujinx.Cpu/Jit/MemoryManagerHostTracked.cs

@@ -0,0 +1,627 @@
+using ARMeilleure.Memory;
+using Ryujinx.Cpu.Jit.HostTracked;
+using Ryujinx.Cpu.Signal;
+using Ryujinx.Memory;
+using Ryujinx.Memory.Range;
+using Ryujinx.Memory.Tracking;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Cpu.Jit
+{
+    /// <summary>
+    /// Represents a CPU memory manager which maps guest virtual memory directly onto a host virtual region.
+    /// </summary>
+    public sealed class MemoryManagerHostTracked : VirtualMemoryManagerRefCountedBase<ulong, ulong>, IWritableBlock, IMemoryManager, IVirtualMemoryManagerTracked
+    {
+        private readonly InvalidAccessHandler _invalidAccessHandler;
+        private readonly bool _unsafeMode;
+
+        private readonly MemoryBlock _backingMemory;
+
+        public int AddressSpaceBits { get; }
+
+        public MemoryTracking Tracking { get; }
+
+        private readonly NativePageTable _nativePageTable;
+        private readonly AddressSpacePartitioned _addressSpace;
+
+        private readonly ManagedPageFlags _pages;
+
+        protected override ulong AddressSpaceSize { get; }
+
+        /// <inheritdoc/>
+        public bool Supports4KBPages => false;
+
+        public IntPtr PageTablePointer => _nativePageTable.PageTablePointer;
+
+        public MemoryManagerType Type => _unsafeMode ? MemoryManagerType.HostTrackedUnsafe : MemoryManagerType.HostTracked;
+
+        public event Action<ulong, ulong> UnmapEvent;
+
+        /// <summary>
+        /// Creates a new instance of the host tracked memory manager.
+        /// </summary>
+        /// <param name="backingMemory">Physical backing memory where virtual memory will be mapped to</param>
+        /// <param name="addressSpaceSize">Size of the address space</param>
+        /// <param name="unsafeMode">True if unmanaged access should not be masked (unsafe), false otherwise.</param>
+        /// <param name="invalidAccessHandler">Optional function to handle invalid memory accesses</param>
+        public MemoryManagerHostTracked(MemoryBlock backingMemory, ulong addressSpaceSize, bool unsafeMode, InvalidAccessHandler invalidAccessHandler)
+        {
+            bool useProtectionMirrors = MemoryBlock.GetPageSize() > PageSize;
+
+            Tracking = new MemoryTracking(this, PageSize, invalidAccessHandler, useProtectionMirrors);
+
+            _backingMemory = backingMemory;
+            _invalidAccessHandler = invalidAccessHandler;
+            _unsafeMode = unsafeMode;
+            AddressSpaceSize = addressSpaceSize;
+
+            ulong asSize = PageSize;
+            int asBits = PageBits;
+
+            while (asSize < AddressSpaceSize)
+            {
+                asSize <<= 1;
+                asBits++;
+            }
+
+            AddressSpaceBits = asBits;
+
+            if (useProtectionMirrors && !NativeSignalHandler.SupportsFaultAddressPatching())
+            {
+                // Currently we require being able to change the fault address to something else
+                // in order to "emulate" 4KB granularity protection on systems with larger page size.
+
+                throw new PlatformNotSupportedException();
+            }
+
+            _pages = new ManagedPageFlags(asBits);
+            _nativePageTable = new(asSize);
+            _addressSpace = new(Tracking, backingMemory, _nativePageTable, useProtectionMirrors);
+        }
+
+        /// <inheritdoc/>
+        public void Map(ulong va, ulong pa, ulong size, MemoryMapFlags flags)
+        {
+            AssertValidAddressAndSize(va, size);
+
+            if (flags.HasFlag(MemoryMapFlags.Private))
+            {
+                _addressSpace.Map(va, pa, size);
+            }
+
+            _pages.AddMapping(va, size);
+            _nativePageTable.Map(va, pa, size, _addressSpace, _backingMemory, flags.HasFlag(MemoryMapFlags.Private));
+
+            Tracking.Map(va, size);
+        }
+
+        /// <inheritdoc/>
+        public void MapForeign(ulong va, nuint hostPointer, ulong size)
+        {
+            throw new NotSupportedException();
+        }
+
+        /// <inheritdoc/>
+        public void Unmap(ulong va, ulong size)
+        {
+            AssertValidAddressAndSize(va, size);
+
+            _addressSpace.Unmap(va, size);
+
+            UnmapEvent?.Invoke(va, size);
+            Tracking.Unmap(va, size);
+
+            _pages.RemoveMapping(va, size);
+            _nativePageTable.Unmap(va, size);
+        }
+
+        public T Read<T>(ulong va) where T : unmanaged
+        {
+            return MemoryMarshal.Cast<byte, T>(GetSpan(va, Unsafe.SizeOf<T>()))[0];
+        }
+
+        public T ReadTracked<T>(ulong va) where T : unmanaged
+        {
+            try
+            {
+                SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), false);
+
+                return Read<T>(va);
+            }
+            catch (InvalidMemoryRegionException)
+            {
+                if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
+                {
+                    throw;
+                }
+
+                return default;
+            }
+        }
+
+        public override void Read(ulong va, Span<byte> data)
+        {
+            ReadImpl(va, data);
+        }
+
+        public void Write<T>(ulong va, T value) where T : unmanaged
+        {
+            Write(va, MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateSpan(ref value, 1)));
+        }
+
+        public void Write(ulong va, ReadOnlySpan<byte> data)
+        {
+            if (data.Length == 0)
+            {
+                return;
+            }
+
+            SignalMemoryTracking(va, (ulong)data.Length, true);
+
+            WriteImpl(va, data);
+        }
+
+        public void WriteUntracked(ulong va, ReadOnlySpan<byte> data)
+        {
+            if (data.Length == 0)
+            {
+                return;
+            }
+
+            WriteImpl(va, data);
+        }
+
+        public bool WriteWithRedundancyCheck(ulong va, ReadOnlySpan<byte> data)
+        {
+            if (data.Length == 0)
+            {
+                return false;
+            }
+
+            SignalMemoryTracking(va, (ulong)data.Length, false);
+
+            if (TryGetVirtualContiguous(va, data.Length, out MemoryBlock memoryBlock, out ulong offset))
+            {
+                var target = memoryBlock.GetSpan(offset, data.Length);
+
+                bool changed = !data.SequenceEqual(target);
+
+                if (changed)
+                {
+                    data.CopyTo(target);
+                }
+
+                return changed;
+            }
+            else
+            {
+                WriteImpl(va, data);
+
+                return true;
+            }
+        }
+
+        private void WriteImpl(ulong va, ReadOnlySpan<byte> data)
+        {
+            try
+            {
+                AssertValidAddressAndSize(va, (ulong)data.Length);
+
+                ulong endVa = va + (ulong)data.Length;
+                int offset = 0;
+
+                while (va < endVa)
+                {
+                    (MemoryBlock memory, ulong rangeOffset, ulong copySize) = GetMemoryOffsetAndSize(va, (ulong)(data.Length - offset));
+
+                    data.Slice(offset, (int)copySize).CopyTo(memory.GetSpan(rangeOffset, (int)copySize));
+
+                    va += copySize;
+                    offset += (int)copySize;
+                }
+            }
+            catch (InvalidMemoryRegionException)
+            {
+                if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
+                {
+                    throw;
+                }
+            }
+        }
+
+        public ReadOnlySpan<byte> GetSpan(ulong va, int size, bool tracked = false)
+        {
+            if (size == 0)
+            {
+                return ReadOnlySpan<byte>.Empty;
+            }
+
+            if (tracked)
+            {
+                SignalMemoryTracking(va, (ulong)size, false);
+            }
+
+            if (TryGetVirtualContiguous(va, size, out MemoryBlock memoryBlock, out ulong offset))
+            {
+                return memoryBlock.GetSpan(offset, size);
+            }
+            else
+            {
+                Span<byte> data = new byte[size];
+
+                ReadImpl(va, data);
+
+                return data;
+            }
+        }
+
+        public WritableRegion GetWritableRegion(ulong va, int size, bool tracked = false)
+        {
+            if (size == 0)
+            {
+                return new WritableRegion(null, va, Memory<byte>.Empty);
+            }
+
+            if (tracked)
+            {
+                SignalMemoryTracking(va, (ulong)size, true);
+            }
+
+            if (TryGetVirtualContiguous(va, size, out MemoryBlock memoryBlock, out ulong offset))
+            {
+                return new WritableRegion(null, va, memoryBlock.GetMemory(offset, size));
+            }
+            else
+            {
+                Memory<byte> memory = new byte[size];
+
+                ReadImpl(va, memory.Span);
+
+                return new WritableRegion(this, va, memory);
+            }
+        }
+
+        public ref T GetRef<T>(ulong va) where T : unmanaged
+        {
+            if (!TryGetVirtualContiguous(va, Unsafe.SizeOf<T>(), out MemoryBlock memory, out ulong offset))
+            {
+                ThrowMemoryNotContiguous();
+            }
+
+            SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), true);
+
+            return ref memory.GetRef<T>(offset);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool IsMapped(ulong va)
+        {
+            return ValidateAddress(va) && _pages.IsMapped(va);
+        }
+
+        public bool IsRangeMapped(ulong va, ulong size)
+        {
+            AssertValidAddressAndSize(va, size);
+
+            return _pages.IsRangeMapped(va, size);
+        }
+
+        private static void ThrowMemoryNotContiguous() => throw new MemoryNotContiguousException();
+
+        private bool TryGetVirtualContiguous(ulong va, int size, out MemoryBlock memory, out ulong offset)
+        {
+            if (_addressSpace.HasAnyPrivateAllocation(va, (ulong)size, out PrivateRange range))
+            {
+                // If we have a private allocation overlapping the range,
+                // then the access is only considered contiguous if it covers the entire range.
+
+                if (range.Memory != null)
+                {
+                    memory = range.Memory;
+                    offset = range.Offset;
+
+                    return true;
+                }
+
+                memory = null;
+                offset = 0;
+
+                return false;
+            }
+
+            memory = _backingMemory;
+            offset = GetPhysicalAddressInternal(va);
+
+            return IsPhysicalContiguous(va, size);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private bool IsPhysicalContiguous(ulong va, int size)
+        {
+            if (!ValidateAddress(va) || !ValidateAddressAndSize(va, (ulong)size))
+            {
+                return false;
+            }
+
+            int pages = GetPagesCount(va, (uint)size, out va);
+
+            for (int page = 0; page < pages - 1; page++)
+            {
+                if (!ValidateAddress(va + PageSize))
+                {
+                    return false;
+                }
+
+                if (GetPhysicalAddressInternal(va) + PageSize != GetPhysicalAddressInternal(va + PageSize))
+                {
+                    return false;
+                }
+
+                va += PageSize;
+            }
+
+            return true;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private ulong GetContiguousSize(ulong va, ulong size)
+        {
+            ulong contiguousSize = PageSize - (va & PageMask);
+
+            if (!ValidateAddress(va) || !ValidateAddressAndSize(va, size))
+            {
+                return contiguousSize;
+            }
+
+            int pages = GetPagesCount(va, size, out va);
+
+            for (int page = 0; page < pages - 1; page++)
+            {
+                if (!ValidateAddress(va + PageSize))
+                {
+                    return contiguousSize;
+                }
+
+                if (GetPhysicalAddressInternal(va) + PageSize != GetPhysicalAddressInternal(va + PageSize))
+                {
+                    return contiguousSize;
+                }
+
+                va += PageSize;
+                contiguousSize += PageSize;
+            }
+
+            return Math.Min(contiguousSize, size);
+        }
+
+        private (MemoryBlock, ulong, ulong) GetMemoryOffsetAndSize(ulong va, ulong size)
+        {
+            PrivateRange privateRange = _addressSpace.GetFirstPrivateAllocation(va, size, out ulong nextVa);
+
+            if (privateRange.Memory != null)
+            {
+                return (privateRange.Memory, privateRange.Offset, privateRange.Size);
+            }
+
+            ulong physSize = GetContiguousSize(va, Math.Min(size, nextVa - va));
+
+            return (_backingMemory, GetPhysicalAddressChecked(va), physSize);
+        }
+
+        public IEnumerable<HostMemoryRange> GetHostRegions(ulong va, ulong size)
+        {
+            if (!ValidateAddressAndSize(va, size))
+            {
+                return null;
+            }
+
+            var regions = new List<HostMemoryRange>();
+            ulong endVa = va + size;
+
+            try
+            {
+                while (va < endVa)
+                {
+                    (MemoryBlock memory, ulong rangeOffset, ulong rangeSize) = GetMemoryOffsetAndSize(va, endVa - va);
+
+                    regions.Add(new((UIntPtr)memory.GetPointer(rangeOffset, rangeSize), rangeSize));
+
+                    va += rangeSize;
+                }
+            }
+            catch (InvalidMemoryRegionException)
+            {
+                return null;
+            }
+
+            return regions;
+        }
+
+        public IEnumerable<MemoryRange> GetPhysicalRegions(ulong va, ulong size)
+        {
+            if (size == 0)
+            {
+                return Enumerable.Empty<MemoryRange>();
+            }
+
+            return GetPhysicalRegionsImpl(va, size);
+        }
+
+        private List<MemoryRange> GetPhysicalRegionsImpl(ulong va, ulong size)
+        {
+            if (!ValidateAddress(va) || !ValidateAddressAndSize(va, size))
+            {
+                return null;
+            }
+
+            int pages = GetPagesCount(va, (uint)size, out va);
+
+            var regions = new List<MemoryRange>();
+
+            ulong regionStart = GetPhysicalAddressInternal(va);
+            ulong regionSize = PageSize;
+
+            for (int page = 0; page < pages - 1; page++)
+            {
+                if (!ValidateAddress(va + PageSize))
+                {
+                    return null;
+                }
+
+                ulong newPa = GetPhysicalAddressInternal(va + PageSize);
+
+                if (GetPhysicalAddressInternal(va) + PageSize != newPa)
+                {
+                    regions.Add(new MemoryRange(regionStart, regionSize));
+                    regionStart = newPa;
+                    regionSize = 0;
+                }
+
+                va += PageSize;
+                regionSize += PageSize;
+            }
+
+            regions.Add(new MemoryRange(regionStart, regionSize));
+
+            return regions;
+        }
+
+        private void ReadImpl(ulong va, Span<byte> data)
+        {
+            if (data.Length == 0)
+            {
+                return;
+            }
+
+            try
+            {
+                AssertValidAddressAndSize(va, (ulong)data.Length);
+
+                ulong endVa = va + (ulong)data.Length;
+                int offset = 0;
+
+                while (va < endVa)
+                {
+                    (MemoryBlock memory, ulong rangeOffset, ulong copySize) = GetMemoryOffsetAndSize(va, (ulong)(data.Length - offset));
+
+                    memory.GetSpan(rangeOffset, (int)copySize).CopyTo(data.Slice(offset, (int)copySize));
+
+                    va += copySize;
+                    offset += (int)copySize;
+                }
+            }
+            catch (InvalidMemoryRegionException)
+            {
+                if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
+                {
+                    throw;
+                }
+            }
+        }
+
+        /// <inheritdoc/>
+        /// <remarks>
+        /// This function also validates that the given range is both valid and mapped, and will throw if it is not.
+        /// </remarks>
+        public void SignalMemoryTracking(ulong va, ulong size, bool write, bool precise = false, int? exemptId = null)
+        {
+            AssertValidAddressAndSize(va, size);
+
+            if (precise)
+            {
+                Tracking.VirtualMemoryEvent(va, size, write, precise: true, exemptId);
+                return;
+            }
+
+            // Software table, used for managed memory tracking.
+
+            _pages.SignalMemoryTracking(Tracking, va, size, write, exemptId);
+        }
+
+        /// <summary>
+        /// Computes the number of pages in a virtual address range.
+        /// </summary>
+        /// <param name="va">Virtual address of the range</param>
+        /// <param name="size">Size of the range</param>
+        /// <param name="startVa">The virtual address of the beginning of the first page</param>
+        /// <remarks>This function does not differentiate between allocated and unallocated pages.</remarks>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private int GetPagesCount(ulong va, ulong size, out ulong startVa)
+        {
+            // WARNING: Always check if ulong does not overflow during the operations.
+            startVa = va & ~(ulong)PageMask;
+            ulong vaSpan = (va - startVa + size + PageMask) & ~(ulong)PageMask;
+
+            return (int)(vaSpan / PageSize);
+        }
+
+        public RegionHandle BeginTracking(ulong address, ulong size, int id, RegionFlags flags = RegionFlags.None)
+        {
+            return Tracking.BeginTracking(address, size, id, flags);
+        }
+
+        public MultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity, int id, RegionFlags flags = RegionFlags.None)
+        {
+            return Tracking.BeginGranularTracking(address, size, handles, granularity, id, flags);
+        }
+
+        public SmartMultiRegionHandle BeginSmartGranularTracking(ulong address, ulong size, ulong granularity, int id)
+        {
+            return Tracking.BeginSmartGranularTracking(address, size, granularity, id);
+        }
+
+        private ulong GetPhysicalAddressChecked(ulong va)
+        {
+            if (!IsMapped(va))
+            {
+                ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}");
+            }
+
+            return GetPhysicalAddressInternal(va);
+        }
+
+        private ulong GetPhysicalAddressInternal(ulong va)
+        {
+            return _nativePageTable.GetPhysicalAddress(va);
+        }
+
+        /// <inheritdoc/>
+        public void Reprotect(ulong va, ulong size, MemoryPermission protection)
+        {
+            // TODO
+        }
+
+        /// <inheritdoc/>
+        public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection, bool guest)
+        {
+            if (guest)
+            {
+                _addressSpace.Reprotect(va, size, protection);
+            }
+            else
+            {
+                _pages.TrackingReprotect(va, size, protection);
+            }
+        }
+
+        /// <summary>
+        /// Disposes of resources used by the memory manager.
+        /// </summary>
+        protected override void Destroy()
+        {
+            _addressSpace.Dispose();
+            _nativePageTable.Dispose();
+        }
+
+        protected override Span<byte> GetPhysicalAddressSpan(ulong pa, int size)
+            => _backingMemory.GetSpan(pa, size);
+
+        protected override ulong TranslateVirtualAddressForRead(ulong va)
+            => GetPhysicalAddressInternal(va);
+    }
+}

src/Ryujinx.Cpu/LightningJit/Arm32/Target/Arm64/InstEmitMemory.cs

@@ -1126,11 +1126,23 @@ namespace Ryujinx.Cpu.LightningJit.Arm32.Target.Arm64
             Operand destination64 = new(destination.Kind, OperandType.I64, destination.Value);
             Operand basePointer = new(regAlloc.FixedPageTableRegister, RegisterType.Integer, OperandType.I64);
 
-            if (mmType == MemoryManagerType.HostMapped || mmType == MemoryManagerType.HostMappedUnsafe)
-            {
-                // We don't need to mask the address for the safe mode, since it is already naturally limited to 32-bit
-                // and can never reach out of the guest address space.
+            // We don't need to mask the address for the safe mode, since it is already naturally limited to 32-bit
+            // and can never reach out of the guest address space.
 
+            if (mmType.IsHostTracked())
+            {
+                int tempRegister = regAlloc.AllocateTempGprRegister();
+
+                Operand pte = new(tempRegister, RegisterType.Integer, OperandType.I64);
+
+                asm.Lsr(pte, guestAddress, new Operand(OperandKind.Constant, OperandType.I32, 12));
+                asm.LdrRr(pte, basePointer, pte, ArmExtensionType.Uxtx, true);
+                asm.Add(destination64, pte, guestAddress);
+
+                regAlloc.FreeTempGprRegister(tempRegister);
+            }
+            else if (mmType.IsHostMapped())
+            {
                 asm.Add(destination64, basePointer, guestAddress);
             }
             else

src/Ryujinx.Cpu/LightningJit/Arm64/InstName.cs

@@ -1131,5 +1131,37 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
 
             return false;
         }
+
+        public static bool IsPartialRegisterUpdateMemory(this InstName name)
+        {
+            switch (name)
+            {
+                case InstName.Ld1AdvsimdSnglAsNoPostIndex:
+                case InstName.Ld1AdvsimdSnglAsPostIndex:
+                case InstName.Ld2AdvsimdSnglAsNoPostIndex:
+                case InstName.Ld2AdvsimdSnglAsPostIndex:
+                case InstName.Ld3AdvsimdSnglAsNoPostIndex:
+                case InstName.Ld3AdvsimdSnglAsPostIndex:
+                case InstName.Ld4AdvsimdSnglAsNoPostIndex:
+                case InstName.Ld4AdvsimdSnglAsPostIndex:
+                    return true;
+            }
+
+            return false;
+        }
+
+        public static bool IsPrefetchMemory(this InstName name)
+        {
+            switch (name)
+            {
+                case InstName.PrfmImm:
+                case InstName.PrfmLit:
+                case InstName.PrfmReg:
+                case InstName.Prfum:
+                    return true;
+            }
+
+            return false;
+        }
     }
 }

src/Ryujinx.Cpu/LightningJit/Arm64/RegisterAllocator.cs

@@ -1,15 +1,12 @@
+using ARMeilleure.Memory;
 using Ryujinx.Cpu.LightningJit.CodeGen.Arm64;
 using System;
-using System.Diagnostics;
 using System.Numerics;
 
 namespace Ryujinx.Cpu.LightningJit.Arm64
 {
     class RegisterAllocator
     {
-        public const int MaxTemps = 1;
-        public const int MaxTempsInclFixed = MaxTemps + 2;
-
         private uint _gprMask;
         private readonly uint _fpSimdMask;
         private readonly uint _pStateMask;
@@ -25,7 +22,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
         public uint AllFpSimdMask => _fpSimdMask;
         public uint AllPStateMask => _pStateMask;
 
-        public RegisterAllocator(uint gprMask, uint fpSimdMask, uint pStateMask, bool hasHostCall)
+        public RegisterAllocator(MemoryManagerType mmType, uint gprMask, uint fpSimdMask, uint pStateMask, bool hasHostCall)
         {
             _gprMask = gprMask;
             _fpSimdMask = fpSimdMask;
@@ -56,7 +53,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
 
             BuildRegisterMap(_registerMap);
 
-            Span<int> tempRegisters = stackalloc int[MaxTemps];
+            Span<int> tempRegisters = stackalloc int[CalculateMaxTemps(mmType)];
 
             for (int index = 0; index < tempRegisters.Length; index++)
             {
@@ -150,5 +147,15 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
         {
             mask &= ~(1u << index);
         }
+
+        public static int CalculateMaxTemps(MemoryManagerType mmType)
+        {
+            return mmType.IsHostMapped() ? 1 : 2;
+        }
+
+        public static int CalculateMaxTempsInclFixed(MemoryManagerType mmType)
+        {
+            return CalculateMaxTemps(mmType) + 2;
+        }
     }
 }

src/Ryujinx.Cpu/LightningJit/Arm64/RegisterUtils.cs

@@ -247,7 +247,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
                     }
                 }
 
-                if (!flags.HasFlag(InstFlags.ReadRt))
+                if (!flags.HasFlag(InstFlags.ReadRt) || name.IsPartialRegisterUpdateMemory())
                 {
                     if (flags.HasFlag(InstFlags.Rt))
                     {
@@ -281,7 +281,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm64
                     gprMask |= MaskFromIndex(ExtractRd(flags, encoding));
                 }
 
-                if (!flags.HasFlag(InstFlags.ReadRt))
+                if (!flags.HasFlag(InstFlags.ReadRt) || name.IsPartialRegisterUpdateMemory())
                 {
                     if (flags.HasFlag(InstFlags.Rt))
                     {

src/Ryujinx.Cpu/LightningJit/Arm64/Target/Arm64/Compiler.cs

@@ -316,7 +316,7 @@ namespace Ryujinx.Cpu.LightningJit.Arm64.Target.Arm64
             uint pStateUseMask = multiBlock.GlobalUseMask.PStateMask;
 
             CodeWriter writer = new();
-            RegisterAllocator regAlloc = new(gprUseMask, fpSimdUseMask, pStateUseMask, multiBlock.HasHostCall);
+            RegisterAllocator regAlloc = new(memoryManager.Type, gprUseMask, fpSimdUseMask, pStateUseMask, multiBlock.HasHostCall);
             RegisterSaveRestore rsr = new(
                 regAlloc.AllGprMask & AbiConstants.GprCalleeSavedRegsMask,
                 regAlloc.AllFpSimdMask & AbiConstants.FpSimdCalleeSavedRegsMask,

src/Ryujinx.Cpu/LightningJit/Arm64/Target/Arm64/Decoder.cs

@@ -274,7 +274,8 @@ namespace Ryujinx.Cpu.LightningJit.Arm64.Target.Arm64
 
                 uint tempGprUseMask = gprUseMask | instGprReadMask | instGprWriteMask;
 
-                if (CalculateAvailableTemps(tempGprUseMask) < CalculateRequiredGprTemps(tempGprUseMask) || totalInsts++ >= MaxInstructionsPerFunction)
+                if (CalculateAvailableTemps(tempGprUseMask) < CalculateRequiredGprTemps(memoryManager.Type, tempGprUseMask) ||
+                    totalInsts++ >= MaxInstructionsPerFunction)
                 {
                     isTruncated = true;
                     address -= 4UL;
@@ -378,9 +379,9 @@ namespace Ryujinx.Cpu.LightningJit.Arm64.Target.Arm64
             return false;
         }
 
-        private static int CalculateRequiredGprTemps(uint gprUseMask)
+        private static int CalculateRequiredGprTemps(MemoryManagerType mmType, uint gprUseMask)
         {
-            return BitOperations.PopCount(gprUseMask & RegisterUtils.ReservedRegsMask) + RegisterAllocator.MaxTempsInclFixed;
+            return BitOperations.PopCount(gprUseMask & RegisterUtils.ReservedRegsMask) + RegisterAllocator.CalculateMaxTempsInclFixed(mmType);
         }
 
         private static int CalculateAvailableTemps(uint gprUseMask)

src/Ryujinx.Cpu/LightningJit/Arm64/Target/Arm64/InstEmitMemory.cs

@@ -55,6 +55,16 @@ namespace Ryujinx.Cpu.LightningJit.Arm64.Target.Arm64
             ulong pc,
             uint encoding)
         {
+            if (name.IsPrefetchMemory() && mmType == MemoryManagerType.HostTrackedUnsafe)
+            {
+                // Prefetch to invalid addresses do not cause faults, so for memory manager
+                // types where we need to access the page table before doing the prefetch,
+                // we should make sure we won't try to access an out of bounds page table region.
+                // To do this, we force the masked memory manager variant to be used.
+
+                mmType = MemoryManagerType.HostTracked;
+            }
+
             switch (addressForm)
             {
                 case AddressForm.OffsetReg:
@@ -511,18 +521,48 @@ namespace Ryujinx.Cpu.LightningJit.Arm64.Target.Arm64
             WriteAddressTranslation(asBits, mmType, regAlloc, ref asm, destination, guestAddress);
         }
 
-        private static void WriteAddressTranslation(int asBits, MemoryManagerType mmType, RegisterAllocator regAlloc, ref Assembler asm, Operand destination, ulong guestAddress)
+        private static void WriteAddressTranslation(
+            int asBits,
+            MemoryManagerType mmType,
+            RegisterAllocator regAlloc,
+            ref Assembler asm,
+            Operand destination,
+            ulong guestAddress)
         {
             asm.Mov(destination, guestAddress);
 
             WriteAddressTranslation(asBits, mmType, regAlloc, ref asm, destination, destination);
         }
 
-        private static void WriteAddressTranslation(int asBits, MemoryManagerType mmType, RegisterAllocator regAlloc, ref Assembler asm, Operand destination, Operand guestAddress)
+        private static void WriteAddressTranslation(
+            int asBits,
+            MemoryManagerType mmType,
+            RegisterAllocator regAlloc,
+            ref Assembler asm,
+            Operand destination,
+            Operand guestAddress)
         {
             Operand basePointer = new(regAlloc.FixedPageTableRegister, RegisterType.Integer, OperandType.I64);
 
-            if (mmType == MemoryManagerType.HostMapped || mmType == MemoryManagerType.HostMappedUnsafe)
+            if (mmType.IsHostTracked())
+            {
+                int tempRegister = regAlloc.AllocateTempGprRegister();
+
+                Operand pte = new(tempRegister, RegisterType.Integer, OperandType.I64);
+
+                asm.Lsr(pte, guestAddress, new Operand(OperandKind.Constant, OperandType.I32, 12));
+
+                if (mmType == MemoryManagerType.HostTracked)
+                {
+                    asm.And(pte, pte, new Operand(OperandKind.Constant, OperandType.I64, ulong.MaxValue >> (64 - (asBits - 12))));
+                }
+
+                asm.LdrRr(pte, basePointer, pte, ArmExtensionType.Uxtx, true);
+                asm.Add(destination, pte, guestAddress);
+
+                regAlloc.FreeTempGprRegister(tempRegister);
+            }
+            else if (mmType.IsHostMapped())
             {
                 if (mmType == MemoryManagerType.HostMapped)
                 {

src/Ryujinx.Cpu/LightningJit/Translator.cs

@@ -68,9 +68,9 @@ namespace Ryujinx.Cpu.LightningJit
 
             FunctionTable.Fill = (ulong)Stubs.SlowDispatchStub;
 
-            if (memory.Type.IsHostMapped())
+            if (memory.Type.IsHostMappedOrTracked())
             {
-                NativeSignalHandler.InitializeSignalHandler(MemoryBlock.GetPageSize());
+                NativeSignalHandler.InitializeSignalHandler();
             }
         }
 

src/Ryujinx.Cpu/MemoryEhMeilleure.cs

@@ -1,3 +1,4 @@
+using Ryujinx.Common;
 using Ryujinx.Cpu.Signal;
 using Ryujinx.Memory;
 using Ryujinx.Memory.Tracking;
@@ -8,19 +9,27 @@ namespace Ryujinx.Cpu
 {
     public class MemoryEhMeilleure : IDisposable
     {
-        private delegate bool TrackingEventDelegate(ulong address, ulong size, bool write);
+        public delegate ulong TrackingEventDelegate(ulong address, ulong size, bool write);
 
+        private readonly MemoryTracking _tracking;
         private readonly TrackingEventDelegate _trackingEvent;
 
+        private readonly ulong _pageSize;
+
         private readonly ulong _baseAddress;
         private readonly ulong _mirrorAddress;
 
-        public MemoryEhMeilleure(MemoryBlock addressSpace, MemoryBlock addressSpaceMirror, MemoryTracking tracking)
+        public MemoryEhMeilleure(MemoryBlock addressSpace, MemoryBlock addressSpaceMirror, MemoryTracking tracking, TrackingEventDelegate trackingEvent = null)
         {
             _baseAddress = (ulong)addressSpace.Pointer;
+
             ulong endAddress = _baseAddress + addressSpace.Size;
 
-            _trackingEvent = tracking.VirtualMemoryEvent;
+            _tracking = tracking;
+            _trackingEvent = trackingEvent ?? VirtualMemoryEvent;
+
+            _pageSize = MemoryBlock.GetPageSize();
+
             bool added = NativeSignalHandler.AddTrackedRegion((nuint)_baseAddress, (nuint)endAddress, Marshal.GetFunctionPointerForDelegate(_trackingEvent));
 
             if (!added)
@@ -28,7 +37,7 @@ namespace Ryujinx.Cpu
                 throw new InvalidOperationException("Number of allowed tracked regions exceeded.");
             }
 
-            if (OperatingSystem.IsWindows())
+            if (OperatingSystem.IsWindows() && addressSpaceMirror != null)
             {
                 // Add a tracking event with no signal handler for the mirror on Windows.
                 // The native handler has its own code to check for the partial overlap race when regions are protected by accident,
@@ -46,6 +55,21 @@ namespace Ryujinx.Cpu
             }
         }
 
+        private ulong VirtualMemoryEvent(ulong address, ulong size, bool write)
+        {
+            ulong pageSize = _pageSize;
+            ulong addressAligned = BitUtils.AlignDown(address, pageSize);
+            ulong endAddressAligned = BitUtils.AlignUp(address + size, pageSize);
+            ulong sizeAligned = endAddressAligned - addressAligned;
+
+            if (_tracking.VirtualMemoryEvent(addressAligned, sizeAligned, write))
+            {
+                return _baseAddress + address;
+            }
+
+            return 0;
+        }
+
         public void Dispose()
         {
             GC.SuppressFinalize(this);

src/Ryujinx.Cpu/PrivateMemoryAllocator.cs

@@ -143,7 +143,7 @@ namespace Ryujinx.Cpu
             }
         }
 
-        public PrivateMemoryAllocator(int blockAlignment, MemoryAllocationFlags allocationFlags) : base(blockAlignment, allocationFlags)
+        public PrivateMemoryAllocator(ulong blockAlignment, MemoryAllocationFlags allocationFlags) : base(blockAlignment, allocationFlags)
         {
         }
 
@@ -180,10 +180,10 @@ namespace Ryujinx.Cpu
 
         private readonly List<T> _blocks;
 
-        private readonly int _blockAlignment;
+        private readonly ulong _blockAlignment;
         private readonly MemoryAllocationFlags _allocationFlags;
 
-        public PrivateMemoryAllocatorImpl(int blockAlignment, MemoryAllocationFlags allocationFlags)
+        public PrivateMemoryAllocatorImpl(ulong blockAlignment, MemoryAllocationFlags allocationFlags)
         {
             _blocks = new List<T>();
             _blockAlignment = blockAlignment;
@@ -212,7 +212,7 @@ namespace Ryujinx.Cpu
                 }
             }
 
-            ulong blockAlignedSize = BitUtils.AlignUp(size, (ulong)_blockAlignment);
+            ulong blockAlignedSize = BitUtils.AlignUp(size, _blockAlignment);
 
             var memory = new MemoryBlock(blockAlignedSize, _allocationFlags);
             var newBlock = createBlock(memory, blockAlignedSize);

src/Ryujinx.Cpu/Signal/NativeSignalHandler.cs

@@ -70,7 +70,7 @@ namespace Ryujinx.Cpu.Signal
             config = new SignalHandlerConfig();
         }
 
-        public static void InitializeSignalHandler(ulong pageSize, Func<IntPtr, IntPtr, IntPtr> customSignalHandlerFactory = null)
+        public static void InitializeSignalHandler(Func<IntPtr, IntPtr, IntPtr> customSignalHandlerFactory = null)
         {
             if (_initialized)
             {
@@ -90,7 +90,7 @@ namespace Ryujinx.Cpu.Signal
 
                 if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
                 {
-                    _signalHandlerPtr = MapCode(NativeSignalHandlerGenerator.GenerateUnixSignalHandler(_handlerConfig, rangeStructSize, pageSize));
+                    _signalHandlerPtr = MapCode(NativeSignalHandlerGenerator.GenerateUnixSignalHandler(_handlerConfig, rangeStructSize));
 
                     if (customSignalHandlerFactory != null)
                     {
@@ -107,7 +107,7 @@ namespace Ryujinx.Cpu.Signal
                     config.StructAddressOffset = 40; // ExceptionInformation1
                     config.StructWriteOffset = 32; // ExceptionInformation0
 
-                    _signalHandlerPtr = MapCode(NativeSignalHandlerGenerator.GenerateWindowsSignalHandler(_handlerConfig, rangeStructSize, pageSize));
+                    _signalHandlerPtr = MapCode(NativeSignalHandlerGenerator.GenerateWindowsSignalHandler(_handlerConfig, rangeStructSize));
 
                     if (customSignalHandlerFactory != null)
                     {
@@ -175,5 +175,10 @@ namespace Ryujinx.Cpu.Signal
 
             return false;
         }
+
+        public static bool SupportsFaultAddressPatching()
+        {
+            return NativeSignalHandlerGenerator.SupportsFaultAddressPatchingForHost();
+        }
     }
 }

src/Ryujinx.Graphics.Gpu/Image/TextureGroup.cs

@@ -1622,14 +1622,6 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// <param name="size">The size of the flushing memory access</param>
         public void FlushAction(TextureGroupHandle handle, ulong address, ulong size)
         {
-            // If the page size is larger than 4KB, we will have a lot of false positives for flushing.
-            // Let's avoid flushing textures that are unlikely to be read from CPU to improve performance
-            // on those platforms.
-            if (!_physicalMemory.Supports4KBPages && !Storage.Info.IsLinear && !_context.IsGpuThread())
-            {
-                return;
-            }
-
             // There is a small gap here where the action is removed but _actionRegistered is still 1.
             // In this case it will skip registering the action, but here we are already handling it,
             // so there shouldn't be any issue as it's the same handler for all actions.

src/Ryujinx.Graphics.Gpu/Memory/PhysicalMemory.cs

@@ -23,11 +23,6 @@ namespace Ryujinx.Graphics.Gpu.Memory
         private readonly IVirtualMemoryManagerTracked _cpuMemory;
         private int _referenceCount;
 
-        /// <summary>
-        /// Indicates whenever the memory manager supports 4KB pages.
-        /// </summary>
-        public bool Supports4KBPages => _cpuMemory.Supports4KBPages;
-
         /// <summary>
         /// In-memory shader cache.
         /// </summary>

src/Ryujinx.HLE/HOS/ArmProcessContextFactory.cs

@@ -72,7 +72,8 @@ namespace Ryujinx.HLE.HOS
 
                 AddressSpace addressSpace = null;
 
-                if (mode == MemoryManagerMode.HostMapped || mode == MemoryManagerMode.HostMappedUnsafe)
+                // We want to use host tracked mode if the host page size is > 4KB.
+                if ((mode == MemoryManagerMode.HostMapped || mode == MemoryManagerMode.HostMappedUnsafe) && MemoryBlock.GetPageSize() <= 0x1000)
                 {
                     if (!AddressSpace.TryCreate(context.Memory, addressSpaceSize, MemoryBlock.GetPageSize() == MemoryManagerHostMapped.PageSize, out addressSpace))
                     {
@@ -91,13 +92,21 @@ namespace Ryujinx.HLE.HOS
 
                     case MemoryManagerMode.HostMapped:
                     case MemoryManagerMode.HostMappedUnsafe:
-                        if (addressSpaceSize != addressSpace.AddressSpaceSize)
+                        if (addressSpace == null)
                         {
-                            Logger.Warning?.Print(LogClass.Emulation, $"Allocated address space (0x{addressSpace.AddressSpaceSize:X}) is smaller than guest application requirements (0x{addressSpaceSize:X})");
+                            var memoryManagerHostTracked = new MemoryManagerHostTracked(context.Memory, addressSpaceSize, mode == MemoryManagerMode.HostMappedUnsafe, invalidAccessHandler);
+                            processContext = new ArmProcessContext<MemoryManagerHostTracked>(pid, cpuEngine, _gpu, memoryManagerHostTracked, addressSpaceSize, for64Bit);
                         }
+                        else
+                        {
+                            if (addressSpaceSize != addressSpace.AddressSpaceSize)
+                            {
+                                Logger.Warning?.Print(LogClass.Emulation, $"Allocated address space (0x{addressSpace.AddressSpaceSize:X}) is smaller than guest application requirements (0x{addressSpaceSize:X})");
+                            }
 
-                        var memoryManagerHostMapped = new MemoryManagerHostMapped(addressSpace, mode == MemoryManagerMode.HostMappedUnsafe, invalidAccessHandler);
-                        processContext = new ArmProcessContext<MemoryManagerHostMapped>(pid, cpuEngine, _gpu, memoryManagerHostMapped, addressSpace.AddressSpaceSize, for64Bit);
+                            var memoryManagerHostMapped = new MemoryManagerHostMapped(addressSpace, mode == MemoryManagerMode.HostMappedUnsafe, invalidAccessHandler);
+                            processContext = new ArmProcessContext<MemoryManagerHostMapped>(pid, cpuEngine, _gpu, memoryManagerHostMapped, addressSpace.AddressSpaceSize, for64Bit);
+                        }
                         break;
 
                     default:

src/Ryujinx.HLE/HOS/Kernel/Memory/KPageTable.cs

@@ -165,6 +165,29 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
         /// <inheritdoc/>
         protected override Result MapForeign(IEnumerable<HostMemoryRange> regions, ulong va, ulong size)
         {
+            ulong backingStart = (ulong)Context.Memory.Pointer;
+            ulong backingEnd = backingStart + Context.Memory.Size;
+
+            KPageList pageList = new();
+
+            foreach (HostMemoryRange region in regions)
+            {
+                // If the range is inside the physical memory, it is shared and we should increment the page count,
+                // otherwise it is private and we don't need to increment the page count.
+
+                if (region.Address >= backingStart && region.Address < backingEnd)
+                {
+                    pageList.AddRange(region.Address - backingStart + DramMemoryMap.DramBase, region.Size / PageSize);
+                }
+            }
+
+            using var scopedPageList = new KScopedPageList(Context.MemoryManager, pageList);
+
+            foreach (var pageNode in pageList)
+            {
+                Context.CommitMemory(pageNode.Address - DramMemoryMap.DramBase, pageNode.PagesCount * PageSize);
+            }
+
             ulong offset = 0;
 
             foreach (var region in regions)
@@ -174,6 +197,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
                 offset += region.Size;
             }
 
+            scopedPageList.SignalSuccess();
+
             return Result.Success;
         }
 

src/Ryujinx.Memory/AddressSpaceManager.cs

@@ -283,9 +283,9 @@ namespace Ryujinx.Memory
             {
                 var hostRegion = hostRegions[i];
 
-                if ((ulong)hostRegion.Address >= backingStart && (ulong)hostRegion.Address < backingEnd)
+                if (hostRegion.Address >= backingStart && hostRegion.Address < backingEnd)
                 {
-                    regions[count++] = new MemoryRange((ulong)hostRegion.Address - backingStart, hostRegion.Size);
+                    regions[count++] = new MemoryRange(hostRegion.Address - backingStart, hostRegion.Size);
                 }
             }
 

src/Ryujinx.Memory/Tracking/VirtualRegion.cs

@@ -70,9 +70,12 @@ namespace Ryujinx.Memory.Tracking
         {
             _lastPermission = MemoryPermission.Invalid;
 
-            foreach (RegionHandle handle in Handles)
+            if (!Guest)
             {
-                handle.SignalMappingChanged(mapped);
+                foreach (RegionHandle handle in Handles)
+                {
+                    handle.SignalMappingChanged(mapped);
+                }
             }
         }