diff --git a/Source/Android/jni/MainAndroid.cpp b/Source/Android/jni/MainAndroid.cpp
index c08106ee4f..4b94996796 100644
--- a/Source/Android/jni/MainAndroid.cpp
+++ b/Source/Android/jni/MainAndroid.cpp
@@ -549,8 +549,7 @@ static float GetRenderSurfaceScale(JNIEnv* env)
 }
 
 static void Run(JNIEnv* env, const std::vector<std::string>& paths, bool riivolution,
-                const std::optional<std::string>& savestate_path = {},
-                bool delete_savestate = false)
+                BootSessionData boot_session_data = BootSessionData())
 {
   ASSERT(!paths.empty());
   __android_log_print(ANDROID_LOG_INFO, DOLPHIN_TAG, "Running : %s", paths[0].c_str());
@@ -561,9 +560,8 @@ static void Run(JNIEnv* env, const std::vector<std::string>& paths, bool riivolu
 
   s_have_wm_user_stop = false;
 
-  std::unique_ptr<BootParameters> boot = BootParameters::GenerateFromFile(paths, savestate_path);
-  if (boot)
-    boot->delete_savestate = delete_savestate;
+  std::unique_ptr<BootParameters> boot =
+      BootParameters::GenerateFromFile(paths, std::move(boot_session_data));
 
   if (riivolution && std::holds_alternative<BootParameters::Disc>(boot->parameters))
   {
@@ -638,8 +636,10 @@ Java_org_dolphinemu_dolphinemu_NativeLibrary_Run___3Ljava_lang_String_2ZLjava_la
     JNIEnv* env, jclass, jobjectArray jPaths, jboolean jRiivolution, jstring jSavestate,
     jboolean jDeleteSavestate)
 {
-  Run(env, JStringArrayToVector(env, jPaths), jRiivolution, GetJString(env, jSavestate),
-      jDeleteSavestate);
+  DeleteSavestateAfterBoot delete_state =
+      jDeleteSavestate ? DeleteSavestateAfterBoot::Yes : DeleteSavestateAfterBoot::No;
+  Run(env, JStringArrayToVector(env, jPaths), jRiivolution,
+      BootSessionData(GetJString(env, jSavestate), delete_state));
 }
 
 JNIEXPORT void JNICALL Java_org_dolphinemu_dolphinemu_NativeLibrary_ChangeDisc(JNIEnv* env, jclass,
diff --git a/Source/Core/Core/Boot/Boot.cpp b/Source/Core/Core/Boot/Boot.cpp
index 3bb2c5e53d..b34e9bbbe5 100644
--- a/Source/Core/Core/Boot/Boot.cpp
+++ b/Source/Core/Core/Boot/Boot.cpp
@@ -112,22 +112,77 @@ static std::vector<std::string> ReadM3UFile(const std::string& m3u_path,
   return result;
 }
 
-BootParameters::BootParameters(Parameters&& parameters_,
-                               const std::optional<std::string>& savestate_path_)
-    : parameters(std::move(parameters_)), savestate_path(savestate_path_)
+BootSessionData::BootSessionData()
 {
 }
 
-std::unique_ptr<BootParameters>
-BootParameters::GenerateFromFile(std::string boot_path,
-                                 const std::optional<std::string>& savestate_path)
+BootSessionData::BootSessionData(std::optional<std::string> savestate_path,
+                                 DeleteSavestateAfterBoot delete_savestate)
+    : m_savestate_path(std::move(savestate_path)), m_delete_savestate(delete_savestate)
 {
-  return GenerateFromFile(std::vector<std::string>{std::move(boot_path)}, savestate_path);
 }
 
-std::unique_ptr<BootParameters>
-BootParameters::GenerateFromFile(std::vector<std::string> paths,
-                                 const std::optional<std::string>& savestate_path)
+BootSessionData::BootSessionData(BootSessionData&& other) = default;
+
+BootSessionData& BootSessionData::operator=(BootSessionData&& other) = default;
+
+BootSessionData::~BootSessionData() = default;
+
+const std::optional<std::string>& BootSessionData::GetSavestatePath() const
+{
+  return m_savestate_path;
+}
+
+DeleteSavestateAfterBoot BootSessionData::GetDeleteSavestate() const
+{
+  return m_delete_savestate;
+}
+
+void BootSessionData::SetSavestateData(std::optional<std::string> savestate_path,
+                                       DeleteSavestateAfterBoot delete_savestate)
+{
+  m_savestate_path = std::move(savestate_path);
+  m_delete_savestate = delete_savestate;
+}
+
+IOS::HLE::FS::FileSystem* BootSessionData::GetWiiSyncFS() const
+{
+  return m_wii_sync_fs.get();
+}
+
+const std::vector<u64>& BootSessionData::GetWiiSyncTitles() const
+{
+  return m_wii_sync_titles;
+}
+
+void BootSessionData::InvokeWiiSyncCleanup() const
+{
+  if (m_wii_sync_cleanup)
+    m_wii_sync_cleanup();
+}
+
+void BootSessionData::SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs,
+                                     std::vector<u64> titles, WiiSyncCleanupFunction cleanup)
+{
+  m_wii_sync_fs = std::move(fs);
+  m_wii_sync_titles = std::move(titles);
+  m_wii_sync_cleanup = std::move(cleanup);
+}
+
+BootParameters::BootParameters(Parameters&& parameters_, BootSessionData boot_session_data_)
+    : parameters(std::move(parameters_)), boot_session_data(std::move(boot_session_data_))
+{
+}
+
+std::unique_ptr<BootParameters> BootParameters::GenerateFromFile(std::string boot_path,
+                                                                 BootSessionData boot_session_data_)
+{
+  return GenerateFromFile(std::vector<std::string>{std::move(boot_path)},
+                          std::move(boot_session_data_));
+}
+
+std::unique_ptr<BootParameters> BootParameters::GenerateFromFile(std::vector<std::string> paths,
+                                                                 BootSessionData boot_session_data_)
 {
   ASSERT(!paths.empty());
 
@@ -176,21 +231,21 @@ BootParameters::GenerateFromFile(std::vector<std::string> paths,
     if (disc)
     {
       return std::make_unique<BootParameters>(Disc{std::move(path), std::move(disc), paths},
-                                              savestate_path);
+                                              std::move(boot_session_data_));
     }
 
     if (extension == ".elf")
     {
       auto elf_reader = std::make_unique<ElfReader>(path);
       return std::make_unique<BootParameters>(Executable{std::move(path), std::move(elf_reader)},
-                                              savestate_path);
+                                              std::move(boot_session_data_));
     }
 
     if (extension == ".dol")
     {
       auto dol_reader = std::make_unique<DolReader>(path);
       return std::make_unique<BootParameters>(Executable{std::move(path), std::move(dol_reader)},
-                                              savestate_path);
+                                              std::move(boot_session_data_));
     }
 
     if (is_drive)
@@ -209,13 +264,13 @@ BootParameters::GenerateFromFile(std::vector<std::string> paths,
   }
 
   if (extension == ".dff")
-    return std::make_unique<BootParameters>(DFF{std::move(path)}, savestate_path);
+    return std::make_unique<BootParameters>(DFF{std::move(path)}, std::move(boot_session_data_));
 
   if (extension == ".wad")
   {
     std::unique_ptr<DiscIO::VolumeWAD> wad = DiscIO::CreateWAD(std::move(path));
     if (wad)
-      return std::make_unique<BootParameters>(std::move(*wad), savestate_path);
+      return std::make_unique<BootParameters>(std::move(*wad), std::move(boot_session_data_));
   }
 
   if (extension == ".json")
@@ -223,7 +278,7 @@ BootParameters::GenerateFromFile(std::vector<std::string> paths,
     auto descriptor = DiscIO::ParseGameModDescriptorFile(path);
     if (descriptor)
     {
-      auto boot_params = GenerateFromFile(descriptor->base_file, savestate_path);
+      auto boot_params = GenerateFromFile(descriptor->base_file, std::move(boot_session_data_));
       if (!boot_params)
       {
         PanicAlertFmtT("Could not recognize file {0}", descriptor->base_file);
diff --git a/Source/Core/Core/Boot/Boot.h b/Source/Core/Core/Boot/Boot.h
index d9a891966b..e27d6a41df 100644
--- a/Source/Core/Core/Boot/Boot.h
+++ b/Source/Core/Core/Boot/Boot.h
@@ -24,6 +24,11 @@ namespace File
 class IOFile;
 }
 
+namespace IOS::HLE::FS
+{
+class FileSystem;
+}
+
 struct RegionSetting
 {
   std::string area;
@@ -34,6 +39,46 @@ struct RegionSetting
 
 class BootExecutableReader;
 
+enum class DeleteSavestateAfterBoot : u8
+{
+  No,
+  Yes
+};
+
+class BootSessionData
+{
+public:
+  BootSessionData();
+  BootSessionData(std::optional<std::string> savestate_path,
+                  DeleteSavestateAfterBoot delete_savestate);
+  BootSessionData(const BootSessionData& other) = delete;
+  BootSessionData(BootSessionData&& other);
+  BootSessionData& operator=(const BootSessionData& other) = delete;
+  BootSessionData& operator=(BootSessionData&& other);
+  ~BootSessionData();
+
+  const std::optional<std::string>& GetSavestatePath() const;
+  DeleteSavestateAfterBoot GetDeleteSavestate() const;
+  void SetSavestateData(std::optional<std::string> savestate_path,
+                        DeleteSavestateAfterBoot delete_savestate);
+
+  using WiiSyncCleanupFunction = std::function<void()>;
+
+  IOS::HLE::FS::FileSystem* GetWiiSyncFS() const;
+  const std::vector<u64>& GetWiiSyncTitles() const;
+  void InvokeWiiSyncCleanup() const;
+  void SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs, std::vector<u64> titles,
+                      WiiSyncCleanupFunction cleanup);
+
+private:
+  std::optional<std::string> m_savestate_path;
+  DeleteSavestateAfterBoot m_delete_savestate = DeleteSavestateAfterBoot::No;
+
+  std::unique_ptr<IOS::HLE::FS::FileSystem> m_wii_sync_fs;
+  std::vector<u64> m_wii_sync_titles;
+  WiiSyncCleanupFunction m_wii_sync_cleanup;
+};
+
 struct BootParameters
 {
   struct Disc
@@ -70,18 +115,17 @@ struct BootParameters
   };
 
   static std::unique_ptr<BootParameters>
-  GenerateFromFile(std::string boot_path, const std::optional<std::string>& savestate_path = {});
+  GenerateFromFile(std::string boot_path, BootSessionData boot_session_data_ = BootSessionData());
   static std::unique_ptr<BootParameters>
   GenerateFromFile(std::vector<std::string> paths,
-                   const std::optional<std::string>& savestate_path = {});
+                   BootSessionData boot_session_data_ = BootSessionData());
 
   using Parameters = std::variant<Disc, Executable, DiscIO::VolumeWAD, NANDTitle, IPL, DFF>;
-  BootParameters(Parameters&& parameters_, const std::optional<std::string>& savestate_path_ = {});
+  BootParameters(Parameters&& parameters_, BootSessionData boot_session_data_ = BootSessionData());
 
   Parameters parameters;
   std::vector<DiscIO::Riivolution::Patch> riivolution_patches;
-  std::optional<std::string> savestate_path;
-  bool delete_savestate = false;
+  BootSessionData boot_session_data;
 };
 
 class CBoot
diff --git a/Source/Core/Core/BootManager.cpp b/Source/Core/Core/BootManager.cpp
index fca36916b3..83361a1c1e 100644
--- a/Source/Core/Core/BootManager.cpp
+++ b/Source/Core/Core/BootManager.cpp
@@ -450,7 +450,7 @@ bool BootCore(std::unique_ptr<BootParameters> boot, const WindowSystemInfo& wsi)
         std::make_unique<BootParameters>(
             BootParameters::IPL{StartUp.m_region,
                                 std::move(std::get<BootParameters::Disc>(boot->parameters))},
-            boot->savestate_path),
+            std::move(boot->boot_session_data)),
         wsi);
   }
   return Core::Init(std::move(boot), wsi);
diff --git a/Source/Core/Core/Core.cpp b/Source/Core/Core/Core.cpp
index 622d7f9d90..6419d13e61 100644
--- a/Source/Core/Core/Core.cpp
+++ b/Source/Core/Core/Core.cpp
@@ -479,8 +479,10 @@ static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi
     Keyboard::LoadConfig();
   }
 
-  const std::optional<std::string> savestate_path = boot->savestate_path;
-  const bool delete_savestate = boot->delete_savestate;
+  BootSessionData boot_session_data = std::move(boot->boot_session_data);
+  const std::optional<std::string>& savestate_path = boot_session_data.GetSavestatePath();
+  const bool delete_savestate =
+      boot_session_data.GetDeleteSavestate() == DeleteSavestateAfterBoot::Yes;
 
   // Load and Init Wiimotes - only if we are booting in Wii mode
   bool init_wiimotes = false;
@@ -615,9 +617,12 @@ static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi
   // Initialise Wii filesystem contents.
   // This is done here after Boot and not in BootManager to ensure that we operate
   // with the correct title context since save copying requires title directories to exist.
-  Common::ScopeGuard wiifs_guard{&Core::CleanUpWiiFileSystemContents};
+  Common::ScopeGuard wiifs_guard{[&boot_session_data] {
+    Core::CleanUpWiiFileSystemContents(boot_session_data);
+    boot_session_data.InvokeWiiSyncCleanup();
+  }};
   if (SConfig::GetInstance().bWii)
-    Core::InitializeWiiFileSystemContents(savegame_redirect);
+    Core::InitializeWiiFileSystemContents(savegame_redirect, boot_session_data);
   else
     wiifs_guard.Dismiss();
 
diff --git a/Source/Core/Core/NetPlayClient.cpp b/Source/Core/Core/NetPlayClient.cpp
index e4cba66429..66fc47e253 100644
--- a/Source/Core/Core/NetPlayClient.cpp
+++ b/Source/Core/Core/NetPlayClient.cpp
@@ -33,6 +33,7 @@
 #include "Common/Version.h"
 
 #include "Core/ActionReplay.h"
+#include "Core/Boot/Boot.h"
 #include "Core/Config/MainSettings.h"
 #include "Core/Config/NetplaySettings.h"
 #include "Core/Config/SessionSettings.h"
@@ -75,8 +76,6 @@ using namespace WiimoteCommon;
 
 static std::mutex crit_netplay_client;
 static NetPlayClient* netplay_client = nullptr;
-static std::unique_ptr<IOS::HLE::FS::FileSystem> s_wii_sync_fs;
-static std::vector<u64> s_wii_sync_titles;
 static bool s_si_poll_batching = false;
 
 // called from ---GUI--- thread
@@ -1191,7 +1190,7 @@ void NetPlayClient::OnSyncSaveDataWii(sf::Packet& packet)
     }
   }
 
-  SetWiiSyncData(std::move(temp_fs), titles);
+  SetWiiSyncData(std::move(temp_fs), std::move(titles));
   SyncSaveDataResponse(true);
 }
 
@@ -1721,7 +1720,14 @@ bool NetPlayClient::StartGame(const std::string& path)
   }
 
   // boot game
-  m_dialog->BootGame(path);
+  auto boot_session_data = std::make_unique<BootSessionData>();
+  boot_session_data->SetWiiSyncData(std::move(m_wii_sync_fs), std::move(m_wii_sync_titles), [] {
+    // on emulation end clean up the Wii save sync directory -- see OnSyncSaveDataWii()
+    const std::string path = File::GetUserPath(D_USER_IDX) + "Wii" GC_MEMCARD_NETPLAY DIR_SEP;
+    if (File::Exists(path))
+      File::DeleteDirRecursively(path);
+  });
+  m_dialog->BootGame(path, std::move(boot_session_data));
 
   UpdateDevices();
 
@@ -2251,8 +2257,6 @@ bool NetPlayClient::StopGame()
   // stop game
   m_dialog->StopGame();
 
-  ClearWiiSyncData();
-
   return true;
 }
 
@@ -2496,6 +2500,13 @@ void NetPlayClient::AdjustPadBufferSize(const unsigned int size)
   m_dialog->OnPadBufferChanged(size);
 }
 
+void NetPlayClient::SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs,
+                                   std::vector<u64> titles)
+{
+  m_wii_sync_fs = std::move(fs);
+  m_wii_sync_titles = std::move(titles);
+}
+
 SyncIdentifier NetPlayClient::GetSDCardIdentifier()
 {
   return SyncIdentifier{{}, "sd", {}, {}, {}, {}};
@@ -2538,33 +2549,6 @@ const NetSettings& GetNetSettings()
   return netplay_client->GetNetSettings();
 }
 
-IOS::HLE::FS::FileSystem* GetWiiSyncFS()
-{
-  return s_wii_sync_fs.get();
-}
-
-const std::vector<u64>& GetWiiSyncTitles()
-{
-  return s_wii_sync_titles;
-}
-
-void SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs, const std::vector<u64>& titles)
-{
-  s_wii_sync_fs = std::move(fs);
-  s_wii_sync_titles.insert(s_wii_sync_titles.end(), titles.begin(), titles.end());
-}
-
-void ClearWiiSyncData()
-{
-  // We're just assuming it will always be here because it is
-  const std::string path = File::GetUserPath(D_USER_IDX) + "Wii" GC_MEMCARD_NETPLAY DIR_SEP;
-  if (File::Exists(path))
-    File::DeleteDirRecursively(path);
-
-  s_wii_sync_fs.reset();
-  s_wii_sync_titles.clear();
-}
-
 void SetSIPollBatching(bool state)
 {
   s_si_poll_batching = state;
diff --git a/Source/Core/Core/NetPlayClient.h b/Source/Core/Core/NetPlayClient.h
index 3c02cad266..24cf494634 100644
--- a/Source/Core/Core/NetPlayClient.h
+++ b/Source/Core/Core/NetPlayClient.h
@@ -23,6 +23,13 @@
 #include "Core/SyncIdentifier.h"
 #include "InputCommon/GCPadStatus.h"
 
+class BootSessionData;
+
+namespace IOS::HLE::FS
+{
+class FileSystem;
+}
+
 namespace UICommon
 {
 class GameFile;
@@ -34,7 +41,8 @@ class NetPlayUI
 {
 public:
   virtual ~NetPlayUI() {}
-  virtual void BootGame(const std::string& filename) = 0;
+  virtual void BootGame(const std::string& filename,
+                        std::unique_ptr<BootSessionData> boot_session_data) = 0;
   virtual void StopGame() = 0;
   virtual bool IsHosting() const = 0;
 
@@ -77,6 +85,8 @@ public:
                                          const std::vector<int>& players) = 0;
   virtual void HideChunkedProgressDialog() = 0;
   virtual void SetChunkedProgress(int pid, u64 progress) = 0;
+
+  virtual void SetHostWiiSyncTitles(std::vector<u64> titles) = 0;
 };
 
 class Player
@@ -147,6 +157,8 @@ public:
 
   void AdjustPadBufferSize(unsigned int size);
 
+  void SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs, std::vector<u64> titles);
+
   static SyncIdentifier GetSDCardIdentifier();
 
 protected:
@@ -313,6 +325,9 @@ private:
 
   u64 m_initial_rtc = 0;
   u32 m_timebase_frame = 0;
+
+  std::unique_ptr<IOS::HLE::FS::FileSystem> m_wii_sync_fs;
+  std::vector<u64> m_wii_sync_titles;
 };
 
 void NetPlay_Enable(NetPlayClient* const np);
diff --git a/Source/Core/Core/NetPlayProto.h b/Source/Core/Core/NetPlayProto.h
index 87af1fe26c..5c5db0da6b 100644
--- a/Source/Core/Core/NetPlayProto.h
+++ b/Source/Core/Core/NetPlayProto.h
@@ -257,10 +257,6 @@ bool IsNetPlayRunning();
 // Precondition: A netplay client instance must be present. In other words,
 //               IsNetPlayRunning() must be true before calling this.
 const NetSettings& GetNetSettings();
-IOS::HLE::FS::FileSystem* GetWiiSyncFS();
-const std::vector<u64>& GetWiiSyncTitles();
-void SetWiiSyncData(std::unique_ptr<IOS::HLE::FS::FileSystem> fs, const std::vector<u64>& titles);
-void ClearWiiSyncData();
 void SetSIPollBatching(bool state);
 void SendPowerButtonEvent();
 bool IsSyncingAllWiiSaves();
diff --git a/Source/Core/Core/NetPlayServer.cpp b/Source/Core/Core/NetPlayServer.cpp
index fc4f1da4d2..c0548a3384 100644
--- a/Source/Core/Core/NetPlayServer.cpp
+++ b/Source/Core/Core/NetPlayServer.cpp
@@ -1819,7 +1819,7 @@ bool NetPlayServer::SyncSaveData()
     }
 
     // Set titles for host-side loading in WiiRoot
-    SetWiiSyncData(nullptr, titles);
+    m_dialog->SetHostWiiSyncTitles(std::move(titles));
 
     SendChunkedToClients(std::move(pac), 1, "Wii Save Synchronization");
   }
diff --git a/Source/Core/Core/WiiRoot.cpp b/Source/Core/Core/WiiRoot.cpp
index d57f194ddc..2af5901dfb 100644
--- a/Source/Core/Core/WiiRoot.cpp
+++ b/Source/Core/Core/WiiRoot.cpp
@@ -17,6 +17,7 @@
 #include "Common/Logging/Log.h"
 #include "Common/NandPaths.h"
 #include "Common/StringUtil.h"
+#include "Core/Boot/Boot.h"
 #include "Core/CommonTitles.h"
 #include "Core/Config/SessionSettings.h"
 #include "Core/ConfigManager.h"
@@ -114,7 +115,8 @@ static bool CopyNandFile(FS::FileSystem* source_fs, const std::string& source_fi
   return true;
 }
 
-static void InitializeDeterministicWiiSaves(FS::FileSystem* session_fs)
+static void InitializeDeterministicWiiSaves(FS::FileSystem* session_fs,
+                                            const BootSessionData& boot_session_data)
 {
   const u64 title_id = SConfig::GetInstance().GetTitleID();
   const auto configured_fs = FS::MakeFileSystem(FS::Location::Configured);
@@ -136,8 +138,8 @@ static void InitializeDeterministicWiiSaves(FS::FileSystem* session_fs)
       (Movie::IsMovieActive() && !Movie::IsStartingFromClearSave()))
   {
     // Copy the current user's save to the Blank NAND
-    auto* sync_fs = NetPlay::GetWiiSyncFS();
-    auto& sync_titles = NetPlay::GetWiiSyncTitles();
+    auto* sync_fs = boot_session_data.GetWiiSyncFS();
+    auto& sync_titles = boot_session_data.GetWiiSyncTitles();
     if (sync_fs)
     {
       for (const u64 title : sync_titles)
@@ -298,7 +300,8 @@ static bool CopySysmenuFilesToFS(FS::FileSystem* fs, const std::string& host_sou
 }
 
 void InitializeWiiFileSystemContents(
-    std::optional<DiscIO::Riivolution::SavegameRedirect> save_redirect)
+    std::optional<DiscIO::Riivolution::SavegameRedirect> save_redirect,
+    const BootSessionData& boot_session_data)
 {
   const auto fs = IOS::HLE::GetIOS()->GetFS();
 
@@ -315,7 +318,7 @@ void InitializeWiiFileSystemContents(
     SysConf sysconf{fs};
     sysconf.Save();
 
-    InitializeDeterministicWiiSaves(fs.get());
+    InitializeDeterministicWiiSaves(fs.get(), boot_session_data);
   }
   else if (save_redirect)
   {
@@ -336,10 +339,10 @@ void InitializeWiiFileSystemContents(
   }
 }
 
-void CleanUpWiiFileSystemContents()
+void CleanUpWiiFileSystemContents(const BootSessionData& boot_session_data)
 {
   if (!WiiRootIsTemporary() || !Config::Get(Config::SESSION_SAVE_DATA_WRITABLE) ||
-      NetPlay::GetWiiSyncFS())
+      boot_session_data.GetWiiSyncFS())
   {
     return;
   }
diff --git a/Source/Core/Core/WiiRoot.h b/Source/Core/Core/WiiRoot.h
index 0b17061b19..2b029b2e17 100644
--- a/Source/Core/Core/WiiRoot.h
+++ b/Source/Core/Core/WiiRoot.h
@@ -8,6 +8,8 @@
 
 #include "DiscIO/RiivolutionPatcher.h"
 
+class BootSessionData;
+
 namespace IOS::HLE::FS
 {
 struct NandRedirect;
@@ -32,8 +34,9 @@ void RestoreWiiSettings(RestoreReason reason);
 
 // Initialize or clean up the filesystem contents.
 void InitializeWiiFileSystemContents(
-    std::optional<DiscIO::Riivolution::SavegameRedirect> save_redirect);
-void CleanUpWiiFileSystemContents();
+    std::optional<DiscIO::Riivolution::SavegameRedirect> save_redirect,
+    const BootSessionData& boot_session_data);
+void CleanUpWiiFileSystemContents(const BootSessionData& boot_session_data);
 
 const std::vector<IOS::HLE::FS::NandRedirect>& GetActiveNandRedirects();
 }  // namespace Core
diff --git a/Source/Core/DolphinNoGUI/MainNoGUI.cpp b/Source/Core/DolphinNoGUI/MainNoGUI.cpp
index 26b0e69a22..f439130441 100644
--- a/Source/Core/DolphinNoGUI/MainNoGUI.cpp
+++ b/Source/Core/DolphinNoGUI/MainNoGUI.cpp
@@ -187,7 +187,8 @@ int main(int argc, char* argv[])
     const std::list<std::string> paths_list = options.all("exec");
     const std::vector<std::string> paths{std::make_move_iterator(std::begin(paths_list)),
                                          std::make_move_iterator(std::end(paths_list))};
-    boot = BootParameters::GenerateFromFile(paths, save_state_path);
+    boot = BootParameters::GenerateFromFile(
+        paths, BootSessionData(save_state_path, DeleteSavestateAfterBoot::No));
     game_specified = true;
   }
   else if (options.is_set("nand_title"))
@@ -204,7 +205,8 @@ int main(int argc, char* argv[])
   }
   else if (args.size())
   {
-    boot = BootParameters::GenerateFromFile(args.front(), save_state_path);
+    boot = BootParameters::GenerateFromFile(
+        args.front(), BootSessionData(save_state_path, DeleteSavestateAfterBoot::No));
     args.erase(args.begin());
     game_specified = true;
   }
diff --git a/Source/Core/DolphinQt/Main.cpp b/Source/Core/DolphinQt/Main.cpp
index f7e8084dab..9c05198ca7 100644
--- a/Source/Core/DolphinQt/Main.cpp
+++ b/Source/Core/DolphinQt/Main.cpp
@@ -197,7 +197,8 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine
     const std::list<std::string> paths_list = options.all("exec");
     const std::vector<std::string> paths{std::make_move_iterator(std::begin(paths_list)),
                                          std::make_move_iterator(std::end(paths_list))};
-    boot = BootParameters::GenerateFromFile(paths, save_state_path);
+    boot = BootParameters::GenerateFromFile(
+        paths, BootSessionData(save_state_path, DeleteSavestateAfterBoot::No));
     game_specified = true;
   }
   else if (options.is_set("nand_title"))
@@ -216,7 +217,8 @@ int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine
   }
   else if (!args.empty())
   {
-    boot = BootParameters::GenerateFromFile(args.front(), save_state_path);
+    boot = BootParameters::GenerateFromFile(
+        args.front(), BootSessionData(save_state_path, DeleteSavestateAfterBoot::No));
     game_specified = true;
   }
 
diff --git a/Source/Core/DolphinQt/MainWindow.cpp b/Source/Core/DolphinQt/MainWindow.cpp
index 7e442398dd..aacdea6a71 100644
--- a/Source/Core/DolphinQt/MainWindow.cpp
+++ b/Source/Core/DolphinQt/MainWindow.cpp
@@ -244,8 +244,13 @@ MainWindow::MainWindow(std::unique_ptr<BootParameters> boot_parameters,
 
     if (!movie_path.empty())
     {
-      if (Movie::PlayInput(movie_path, &m_pending_boot->savestate_path))
+      std::optional<std::string> savestate_path;
+      if (Movie::PlayInput(movie_path, &savestate_path))
+      {
+        m_pending_boot->boot_session_data.SetSavestateData(std::move(savestate_path),
+                                                           DeleteSavestateAfterBoot::No);
         emit RecordingStatusChanged(true);
+      }
     }
   }
 
@@ -768,14 +773,16 @@ void MainWindow::Play(const std::optional<std::string>& savestate_path)
     std::shared_ptr<const UICommon::GameFile> selection = m_game_list->GetSelectedGame();
     if (selection)
     {
-      StartGame(selection->GetFilePath(), ScanForSecondDisc::Yes, savestate_path);
+      StartGame(selection->GetFilePath(), ScanForSecondDisc::Yes,
+                std::make_unique<BootSessionData>(savestate_path, DeleteSavestateAfterBoot::No));
     }
     else
     {
       const QString default_path = QString::fromStdString(Config::Get(Config::MAIN_DEFAULT_ISO));
       if (!default_path.isEmpty() && QFile::exists(default_path))
       {
-        StartGame(default_path, ScanForSecondDisc::Yes, savestate_path);
+        StartGame(default_path, ScanForSecondDisc::Yes,
+                  std::make_unique<BootSessionData>(savestate_path, DeleteSavestateAfterBoot::No));
       }
       else
       {
@@ -978,7 +985,7 @@ void MainWindow::ScreenShot()
 }
 
 void MainWindow::ScanForSecondDiscAndStartGame(const UICommon::GameFile& game,
-                                               const std::optional<std::string>& savestate_path)
+                                               std::unique_ptr<BootSessionData> boot_session_data)
 {
   auto second_game = m_game_list->FindSecondDisc(game);
 
@@ -986,35 +993,37 @@ void MainWindow::ScanForSecondDiscAndStartGame(const UICommon::GameFile& game,
   if (second_game != nullptr)
     paths.push_back(second_game->GetFilePath());
 
-  StartGame(paths, savestate_path);
+  StartGame(paths, std::move(boot_session_data));
 }
 
 void MainWindow::StartGame(const QString& path, ScanForSecondDisc scan,
-                           const std::optional<std::string>& savestate_path)
+                           std::unique_ptr<BootSessionData> boot_session_data)
 {
-  StartGame(path.toStdString(), scan, savestate_path);
+  StartGame(path.toStdString(), scan, std::move(boot_session_data));
 }
 
 void MainWindow::StartGame(const std::string& path, ScanForSecondDisc scan,
-                           const std::optional<std::string>& savestate_path)
+                           std::unique_ptr<BootSessionData> boot_session_data)
 {
   if (scan == ScanForSecondDisc::Yes)
   {
     std::shared_ptr<const UICommon::GameFile> game = m_game_list->FindGame(path);
     if (game != nullptr)
     {
-      ScanForSecondDiscAndStartGame(*game, savestate_path);
+      ScanForSecondDiscAndStartGame(*game, std::move(boot_session_data));
       return;
     }
   }
 
-  StartGame(BootParameters::GenerateFromFile(path, savestate_path));
+  StartGame(BootParameters::GenerateFromFile(
+      path, boot_session_data ? std::move(*boot_session_data) : BootSessionData()));
 }
 
 void MainWindow::StartGame(const std::vector<std::string>& paths,
-                           const std::optional<std::string>& savestate_path)
+                           std::unique_ptr<BootSessionData> boot_session_data)
 {
-  StartGame(BootParameters::GenerateFromFile(paths, savestate_path));
+  StartGame(BootParameters::GenerateFromFile(
+      paths, boot_session_data ? std::move(*boot_session_data) : BootSessionData()));
 }
 
 void MainWindow::StartGame(std::unique_ptr<BootParameters>&& parameters)
@@ -1363,13 +1372,15 @@ void MainWindow::NetPlayInit()
 {
   const auto& game_list_model = m_game_list->GetGameListModel();
   m_netplay_setup_dialog = new NetPlaySetupDialog(game_list_model, this);
-  m_netplay_dialog = new NetPlayDialog(game_list_model);
+  m_netplay_dialog = new NetPlayDialog(
+      game_list_model,
+      [this](const std::string& path, std::unique_ptr<BootSessionData> boot_session_data) {
+        StartGame(path, ScanForSecondDisc::Yes, std::move(boot_session_data));
+      });
 #ifdef USE_DISCORD_PRESENCE
   m_netplay_discord = new DiscordHandler(this);
 #endif
 
-  connect(m_netplay_dialog, &NetPlayDialog::Boot, this,
-          [this](const QString& path) { StartGame(path, ScanForSecondDisc::Yes); });
   connect(m_netplay_dialog, &NetPlayDialog::Stop, this, &MainWindow::ForceStop);
   connect(m_netplay_dialog, &NetPlayDialog::rejected, this, &MainWindow::NetPlayQuit);
   connect(m_netplay_setup_dialog, &NetPlaySetupDialog::Join, this, &MainWindow::NetPlayJoin);
@@ -1818,8 +1829,7 @@ void MainWindow::ShowRiivolutionBootWidget(const UICommon::GameFile& game)
   std::vector<std::string> paths = {game.GetFilePath()};
   if (second_game != nullptr)
     paths.push_back(second_game->GetFilePath());
-  std::unique_ptr<BootParameters> boot_params =
-      BootParameters::GenerateFromFile(paths, std::nullopt);
+  std::unique_ptr<BootParameters> boot_params = BootParameters::GenerateFromFile(paths);
   if (!boot_params)
     return;
   if (!std::holds_alternative<BootParameters::Disc>(boot_params->parameters))
diff --git a/Source/Core/DolphinQt/MainWindow.h b/Source/Core/DolphinQt/MainWindow.h
index c0e97af96d..6e53f2df10 100644
--- a/Source/Core/DolphinQt/MainWindow.h
+++ b/Source/Core/DolphinQt/MainWindow.h
@@ -15,6 +15,7 @@ class QStackedWidget;
 class QString;
 
 class BreakpointWidget;
+class BootSessionData;
 struct BootParameters;
 class CheatsManager;
 class CodeWidget;
@@ -132,13 +133,13 @@ private:
   };
 
   void ScanForSecondDiscAndStartGame(const UICommon::GameFile& game,
-                                     const std::optional<std::string>& savestate_path = {});
+                                     std::unique_ptr<BootSessionData> boot_session_data = nullptr);
   void StartGame(const QString& path, ScanForSecondDisc scan,
-                 const std::optional<std::string>& savestate_path = {});
+                 std::unique_ptr<BootSessionData> boot_session_data = nullptr);
   void StartGame(const std::string& path, ScanForSecondDisc scan,
-                 const std::optional<std::string>& savestate_path = {});
+                 std::unique_ptr<BootSessionData> boot_session_data = nullptr);
   void StartGame(const std::vector<std::string>& paths,
-                 const std::optional<std::string>& savestate_path = {});
+                 std::unique_ptr<BootSessionData> boot_session_data = nullptr);
   void StartGame(std::unique_ptr<BootParameters>&& parameters);
   void ShowRenderWidget();
   void HideRenderWidget(bool reinit = true, bool is_exit = false);
diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
index 464cb506db..bcf5704a29 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp
@@ -31,6 +31,7 @@
 #include "Common/Logging/Log.h"
 #include "Common/TraversalClient.h"
 
+#include "Core/Boot/Boot.h"
 #include "Core/Config/GraphicsSettings.h"
 #include "Core/Config/MainSettings.h"
 #include "Core/Config/NetplaySettings.h"
@@ -39,6 +40,7 @@
 #ifdef HAS_LIBMGBA
 #include "Core/HW/GBACore.h"
 #endif
+#include "Core/IOS/FS/FileSystem.h"
 #include "Core/NetPlayServer.h"
 #include "Core/SyncIdentifier.h"
 
@@ -62,8 +64,10 @@
 #include "VideoCommon/RenderBase.h"
 #include "VideoCommon/VideoConfig.h"
 
-NetPlayDialog::NetPlayDialog(const GameListModel& game_list_model, QWidget* parent)
-    : QDialog(parent), m_game_list_model(game_list_model)
+NetPlayDialog::NetPlayDialog(const GameListModel& game_list_model,
+                             StartGameCallback start_game_callback, QWidget* parent)
+    : QDialog(parent), m_game_list_model(game_list_model),
+      m_start_game_callback(std::move(start_game_callback))
 {
   setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
@@ -682,10 +686,11 @@ void NetPlayDialog::UpdateGUI()
 
 // NetPlayUI methods
 
-void NetPlayDialog::BootGame(const std::string& filename)
+void NetPlayDialog::BootGame(const std::string& filename,
+                             std::unique_ptr<BootSessionData> boot_session_data)
 {
   m_got_stop_request = false;
-  emit Boot(QString::fromStdString(filename));
+  m_start_game_callback(filename, std::move(boot_session_data));
 }
 
 void NetPlayDialog::StopGame()
@@ -1173,3 +1178,10 @@ void NetPlayDialog::SetChunkedProgress(const int pid, const u64 progress)
       m_chunked_progress_dialog->SetProgress(pid, progress);
   });
 }
+
+void NetPlayDialog::SetHostWiiSyncTitles(std::vector<u64> titles)
+{
+  auto client = Settings::Instance().GetNetPlayClient();
+  if (client)
+    client->SetWiiSyncData(nullptr, std::move(titles));
+}
diff --git a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
index b2753236ba..fd14cea4e7 100644
--- a/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
+++ b/Source/Core/DolphinQt/NetPlay/NetPlayDialog.h
@@ -3,6 +3,10 @@
 
 #pragma once
 
+#include <functional>
+#include <memory>
+#include <string>
+
 #include <QDialog>
 #include <QMenuBar>
 
@@ -11,6 +15,7 @@
 #include "DolphinQt/GameList/GameListModel.h"
 #include "VideoCommon/OnScreenDisplay.h"
 
+class BootSessionData;
 class ChunkedProgressDialog;
 class MD5Dialog;
 class PadMappingDialog;
@@ -30,14 +35,19 @@ class NetPlayDialog : public QDialog, public NetPlay::NetPlayUI
 {
   Q_OBJECT
 public:
-  explicit NetPlayDialog(const GameListModel& game_list_model, QWidget* parent = nullptr);
+  using StartGameCallback = std::function<void(const std::string& path,
+                                               std::unique_ptr<BootSessionData> boot_session_data)>;
+
+  explicit NetPlayDialog(const GameListModel& game_list_model,
+                         StartGameCallback start_game_callback, QWidget* parent = nullptr);
   ~NetPlayDialog();
 
   void show(std::string nickname, bool use_traversal);
   void reject() override;
 
   // NetPlayUI methods
-  void BootGame(const std::string& filename) override;
+  void BootGame(const std::string& filename,
+                std::unique_ptr<BootSessionData> boot_session_data) override;
   void StopGame() override;
   bool IsHosting() const override;
 
@@ -84,8 +94,10 @@ public:
                                  const std::vector<int>& players) override;
   void HideChunkedProgressDialog() override;
   void SetChunkedProgress(int pid, u64 progress) override;
+
+  void SetHostWiiSyncTitles(std::vector<u64> titles) override;
+
 signals:
-  void Boot(const QString& filename);
   void Stop();
 
 private:
@@ -162,4 +174,6 @@ private:
   int m_player_count = 0;
   int m_old_player_count = 0;
   bool m_host_input_authority = false;
+
+  StartGameCallback m_start_game_callback;
 };