skip unnecessary copy

src/Ryujinx.Cpu/AppleHv/HvMemoryManager.cs

@@ -151,6 +151,11 @@ namespace Ryujinx.Cpu.AppleHv
             }
         }
 
+        public override bool TryReadUnsafe(ulong va, int length, out Span<byte> data)
+        {
+            throw new NotImplementedException();
+        }
+
         public override void Write(ulong va, ReadOnlySpan<byte> data)
         {
             try

src/Ryujinx.Cpu/Jit/MemoryManager.cs

@@ -175,6 +175,11 @@ namespace Ryujinx.Cpu.Jit
             }
         }
         
+        public override bool TryReadUnsafe(ulong va, int length, out Span<byte> data)
+        {
+            throw new NotImplementedException();
+        }
+
         public override void Write(ulong va, ReadOnlySpan<byte> data)
         {
             try

src/Ryujinx.Cpu/Jit/MemoryManagerHostMapped.cs

@@ -152,6 +152,11 @@ namespace Ryujinx.Cpu.Jit
             }
         }
         
+        public override bool TryReadUnsafe(ulong va, int length, out Span<byte> data)
+        {
+            throw new NotImplementedException();
+        }
+
         public override T ReadTracked<T>(ulong va)
         {
             try

src/Ryujinx.Cpu/Jit/MemoryManagerHostTracked.cs

@@ -228,6 +228,11 @@ namespace Ryujinx.Cpu.Jit
             }
         }
         
+        public override bool TryReadUnsafe(ulong va, int length, out Span<byte> data)
+        {
+            throw new NotImplementedException();
+        }
+
         public override bool WriteWithRedundancyCheck(ulong va, ReadOnlySpan<byte> data)
         {
             if (data.Length == 0)

src/Ryujinx.HLE/HOS/Services/Nv/INvDrvServices.cs

@@ -123,15 +123,15 @@ namespace Ryujinx.HLE.HOS.Services.Nv
                     return NvResult.InvalidSize;
                 }
 
-                byte[] outputData = new byte[outputDataSize];
-
-                byte[] temp = new byte[inputDataSize];
-
-                context.Memory.Read(inputDataPosition, temp);
-
-                Buffer.BlockCopy(temp, 0, outputData, 0, temp.Length);
-
-                arguments = new Span<byte>(outputData);
+                if (!context.Memory.TryReadUnsafe(inputDataPosition, (int)inputDataSize, out arguments))
+                {
+                    arguments = new byte[inputDataSize];
+                    context.Memory.Read(inputDataPosition, arguments);
+                }
+                else
+                {
+                    arguments = arguments.ToArray();
+                }
             }
             else if (isWrite)
             {
@@ -471,11 +471,11 @@ namespace Ryujinx.HLE.HOS.Services.Nv
 
                 errorCode = GetIoctlArgument(context, ioctlCommand, out Span<byte> arguments);
                 
-                byte[] temp = new byte[inlineInBufferSize];
-
-                context.Memory.Read(inlineInBufferPosition, temp);
-
-                Span<byte> inlineInBuffer = new(temp);
+                if (!context.Memory.TryReadUnsafe(inlineInBufferPosition, (int)inlineInBufferSize, out Span<byte> inlineInBuffer))
+                {
+                    inlineInBuffer = new byte[inlineInBufferSize];
+                    context.Memory.Read(inlineInBufferPosition, inlineInBuffer);
+                }
 
                 if (errorCode == NvResult.Success)
                 {

src/Ryujinx.Memory/IVirtualMemoryManager.cs

@@ -61,6 +61,15 @@ namespace Ryujinx.Memory
         /// <exception cref="InvalidMemoryRegionException">Throw for unhandled invalid or unmapped memory accesses</exception>
         void Read(ulong va, Span<byte> data);
         
+        /// <summary>
+        /// Gets a span of CPU mapped memory.
+        /// </summary>
+        /// <param name="va">Virtual address of the data in memory</param>
+        /// <param name="length">Length of the data in memory</param>
+        /// <param name="data">Span that references the data being read</param>
+        /// <exception cref="InvalidMemoryRegionException">Throw for unhandled invalid or unmapped memory accesses</exception>
+        bool TryReadUnsafe(ulong va, int length, out Span<byte> data);
+
         /// <summary>
         /// Writes data to CPU mapped memory.
         /// </summary>

src/Ryujinx.Memory/VirtualMemoryManagerBase.cs

@@ -159,6 +159,13 @@ namespace Ryujinx.Memory
 
             AssertValidAddressAndSize(va, data.Length);
 
+            if (IsContiguousAndMapped(va, data.Length))
+            {
+                nuint pa = TranslateVirtualAddressChecked(va);
+            
+                GetPhysicalAddressSpan(pa, data.Length).CopyTo(data);
+            }
+            
             int offset = 0, size;
 
             if ((va & PageMask) != 0)
@@ -182,6 +189,28 @@ namespace Ryujinx.Memory
             }
         }
 
+        public virtual bool TryReadUnsafe(ulong va, int length, out Span<byte> data)
+        {
+            if (!IsContiguousAndMapped(va, length))
+            {
+                data = default;
+                return false;
+            }
+            
+            if (length == 0)
+            {
+                data = Span<byte>.Empty;
+                return true;
+            }
+        
+            AssertValidAddressAndSize(va, length);
+        
+            nuint pa = TranslateVirtualAddressChecked(va);
+        
+            data = GetPhysicalAddressSpan(pa, length);
+            return true;
+        }
+
         public virtual T ReadTracked<T>(ulong va) where T : unmanaged
         {
             SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), false);

src/Ryujinx.Tests.Memory/MockVirtualMemoryManager.cs

@@ -43,6 +43,11 @@ namespace Ryujinx.Tests.Memory
             throw new NotImplementedException();
         }
         
+        public bool TryReadUnsafe(ulong va, int lenfth, out Span<byte> data)
+        {
+            throw new NotImplementedException();
+        }
+
         public void Write<T>(ulong va, T value) where T : unmanaged
         {
             throw new NotImplementedException();