Signal memory tracking before/after mapping into another process (#1785)

* Signal memory tracking before/after mapping into another process

* Wording.

* Add missing method.

Ryujinx.HLE/HOS/Kernel/Memory/KMemoryManager.cs

@@ -1656,6 +1656,9 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
                 }
             }
 
+            // Signal a read for any resources tracking reads in the region, as the other process is likely to use their data.
+            _cpuMemory.SignalMemoryTracking(addressTruncated, endAddrRounded - addressTruncated, false);
+
             lock (_blocks)
             {
                 KernelResult result;
@@ -2036,6 +2039,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
             ulong endAddr = address + size;
 
             ulong addressRounded   = BitUtils.AlignUp  (address, PageSize);
+            ulong addressTruncated = BitUtils.AlignDown(address, PageSize);
+            ulong endAddrRounded   = BitUtils.AlignUp  (endAddr, PageSize);
             ulong endAddrTruncated = BitUtils.AlignDown(endAddr, PageSize);
 
             ulong pagesCount = addressRounded < endAddrTruncated ? (endAddrTruncated - addressRounded) / PageSize : 0;
@@ -2071,6 +2076,9 @@ namespace Ryujinx.HLE.HOS.Kernel.Memory
                 return KernelResult.OutOfResource;
             }
 
+            // Anything on the client side should see this memory as modified.
+            _cpuMemory.SignalMemoryTracking(addressTruncated, endAddrRounded - addressTruncated, true);
+
             lock (_blocks)
             {
                 foreach (KMemoryInfo info in IterateOverRange(addressRounded, endAddrTruncated))

Ryujinx.Memory.Tests/MockVirtualMemoryManager.cs

@@ -75,6 +75,11 @@ namespace Ryujinx.Memory.Tests
             throw new NotImplementedException();
         }
 
+        public void SignalMemoryTracking(ulong va, ulong size, bool write)
+        {
+            throw new NotImplementedException();
+        }
+
         public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
         {
         }

Ryujinx.Memory/AddressSpaceManager.cs

@@ -545,5 +545,10 @@ namespace Ryujinx.Memory
                 _pageTable[l0] = null;
             }
         }
+
+        public void SignalMemoryTracking(ulong va, ulong size, bool write)
+        {
+            // Only the ARM Memory Manager has tracking for now.
+        }
     }
 }

Ryujinx.Memory/IVirtualMemoryManager.cs

@@ -23,6 +23,7 @@ namespace Ryujinx.Memory
         bool IsRangeMapped(ulong va, ulong size);
         ulong GetPhysicalAddress(ulong va);
 
+        void SignalMemoryTracking(ulong va, ulong size, bool write);
         void TrackingReprotect(ulong va, ulong size, MemoryPermission protection);
     }
 }