diff --git a/Source/Core/DolphinQt/CMakeLists.txt b/Source/Core/DolphinQt/CMakeLists.txt
index 004eb2b86f..3d3bf12ed4 100644
--- a/Source/Core/DolphinQt/CMakeLists.txt
+++ b/Source/Core/DolphinQt/CMakeLists.txt
@@ -540,6 +540,15 @@ else()
   install(TARGETS dolphin-emu RUNTIME DESTINATION ${bindir})
 endif()
 
+if(USE_MGBA)
+  target_sources(dolphin-emu PRIVATE
+    GBAHost.cpp
+    GBAHost.h
+    GBAWidget.cpp
+    GBAWidget.h
+  )
+endif()
+
 if(USE_DISCORD_PRESENCE)
   target_compile_definitions(dolphin-emu PRIVATE -DUSE_DISCORD_PRESENCE)
 endif()
diff --git a/Source/Core/DolphinQt/DolphinQt.vcxproj b/Source/Core/DolphinQt/DolphinQt.vcxproj
index e8e3822cd1..3647f255df 100644
--- a/Source/Core/DolphinQt/DolphinQt.vcxproj
+++ b/Source/Core/DolphinQt/DolphinQt.vcxproj
@@ -142,6 +142,8 @@
     <ClCompile Include="GameList\GameTracker.cpp" />
     <ClCompile Include="GameList\GridProxyModel.cpp" />
     <ClCompile Include="GameList\ListProxyModel.cpp" />
+    <ClCompile Include="GBAHost.cpp" />
+    <ClCompile Include="GBAWidget.cpp" />
     <ClCompile Include="GCMemcardCreateNewDialog.cpp" />
     <ClCompile Include="GCMemcardManager.cpp" />
     <ClCompile Include="Host.cpp" />
@@ -208,6 +210,7 @@
     <ClInclude Include="Config\NewPatchDialog.h" />
     <ClInclude Include="Config\PatchesWidget.h" />
     <ClInclude Include="Debugger\RegisterColumn.h" />
+    <ClInclude Include="GBAHost.h" />
     <ClInclude Include="QtUtils\ActionHelper.h" />
     <ClInclude Include="QtUtils\FlowLayout.h" />
     <ClInclude Include="QtUtils\ImageConverter.h" />
@@ -313,6 +316,7 @@
     <QtMoc Include="GameList\GameTracker.h" />
     <QtMoc Include="GameList\GridProxyModel.h" />
     <QtMoc Include="GameList\ListProxyModel.h" />
+    <QtMoc Include="GBAWidget.h" />
     <QtMoc Include="GCMemcardCreateNewDialog.h" />
     <QtMoc Include="GCMemcardManager.h" />
     <QtMoc Include="Host.h" />
diff --git a/Source/Core/DolphinQt/GBAHost.cpp b/Source/Core/DolphinQt/GBAHost.cpp
new file mode 100644
index 0000000000..918426e320
--- /dev/null
+++ b/Source/Core/DolphinQt/GBAHost.cpp
@@ -0,0 +1,61 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/GBAHost.h"
+
+#include <QApplication>
+
+#include "Core/HW/GBACore.h"
+#include "DolphinQt/GBAWidget.h"
+#include "DolphinQt/QtUtils/QueueOnObject.h"
+
+GBAHost::GBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  m_widget_controller = new GBAWidgetController();
+  m_widget_controller->moveToThread(qApp->thread());
+  m_core = std::move(core);
+  auto core_ptr = m_core.lock();
+
+  int device_number = core_ptr->GetDeviceNumber();
+  std::string game_title = core_ptr->GetGameTitle();
+  u32 width, height;
+  core_ptr->GetVideoDimensions(&width, &height);
+
+  QueueOnObject(m_widget_controller, [widget_controller = m_widget_controller, core = m_core,
+                                      device_number, game_title, width, height] {
+    widget_controller->Create(core, device_number, game_title, width, height);
+  });
+}
+
+GBAHost::~GBAHost()
+{
+  m_widget_controller->deleteLater();
+}
+
+void GBAHost::GameChanged()
+{
+  auto core_ptr = m_core.lock();
+  if (!core_ptr || !core_ptr->IsStarted())
+    return;
+
+  std::string game_title = core_ptr->GetGameTitle();
+  u32 width, height;
+  core_ptr->GetVideoDimensions(&width, &height);
+
+  QueueOnObject(m_widget_controller,
+                [widget_controller = m_widget_controller, game_title, width, height] {
+                  widget_controller->GameChanged(game_title, width, height);
+                });
+}
+
+void GBAHost::FrameEnded(const std::vector<u32>& video_buffer)
+{
+  QueueOnObject(m_widget_controller, [widget_controller = m_widget_controller, video_buffer] {
+    widget_controller->FrameEnded(video_buffer);
+  });
+}
+
+std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
+{
+  return std::make_unique<GBAHost>(core);
+}
diff --git a/Source/Core/DolphinQt/GBAHost.h b/Source/Core/DolphinQt/GBAHost.h
new file mode 100644
index 0000000000..99e28bd2af
--- /dev/null
+++ b/Source/Core/DolphinQt/GBAHost.h
@@ -0,0 +1,28 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <vector>
+
+#include "Core/Host.h"
+
+namespace HW::GBA
+{
+class Core;
+}  // namespace HW::GBA
+
+class GBAWidgetController;
+
+class GBAHost : public GBAHostInterface
+{
+public:
+  explicit GBAHost(std::weak_ptr<HW::GBA::Core> core);
+  ~GBAHost();
+  void GameChanged() override;
+  void FrameEnded(const std::vector<u32>& video_buffer) override;
+
+private:
+  GBAWidgetController* m_widget_controller{};
+  std::weak_ptr<HW::GBA::Core> m_core;
+};
diff --git a/Source/Core/DolphinQt/GBAWidget.cpp b/Source/Core/DolphinQt/GBAWidget.cpp
new file mode 100644
index 0000000000..df9423a67f
--- /dev/null
+++ b/Source/Core/DolphinQt/GBAWidget.cpp
@@ -0,0 +1,421 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/GBAWidget.h"
+
+#include <fmt/format.h>
+
+#include <QAction>
+#include <QCloseEvent>
+#include <QContextMenuEvent>
+#include <QDragEnterEvent>
+#include <QDropEvent>
+#include <QFileDialog>
+#include <QIcon>
+#include <QImage>
+#include <QMenu>
+#include <QMimeData>
+#include <QPainter>
+
+#include "AudioCommon/AudioCommon.h"
+#include "Core/Config/MainSettings.h"
+#include "Core/Core.h"
+#include "Core/CoreTiming.h"
+#include "Core/HW/GBACore.h"
+#include "Core/HW/GBAPad.h"
+#include "Core/HW/SI/SI.h"
+#include "Core/HW/SI/SI_Device.h"
+#include "Core/Movie.h"
+#include "Core/NetPlayProto.h"
+#include "DolphinQt/QtUtils/ModalMessageBox.h"
+#include "DolphinQt/Resources.h"
+#include "DolphinQt/Settings.h"
+#include "DolphinQt/Settings/GameCubePane.h"
+
+static void RestartCore(const std::weak_ptr<HW::GBA::Core>& core, std::string_view rom_path = {})
+{
+  Core::RunOnCPUThread(
+      [core, rom_path = std::string(rom_path)] {
+        if (auto core_ptr = core.lock())
+        {
+          auto& info = Config::MAIN_GBA_ROM_PATHS[core_ptr->GetDeviceNumber()];
+          core_ptr->Stop();
+          Config::SetCurrent(info, rom_path);
+          if (core_ptr->Start(CoreTiming::GetTicks()))
+            return;
+          Config::SetCurrent(info, Config::GetBase(info));
+          core_ptr->Start(CoreTiming::GetTicks());
+        }
+      },
+      false);
+}
+
+GBAWidget::GBAWidget(std::weak_ptr<HW::GBA::Core> core, int device_number,
+                     std::string_view game_title, int width, int height, QWidget* parent,
+                     Qt::WindowFlags flags)
+    : QWidget(parent, flags), m_core(std::move(core)), m_device_number(device_number),
+      m_local_pad(device_number), m_game_title(game_title), m_width(width), m_height(height),
+      m_is_local_pad(true), m_volume(0), m_muted(false), m_force_disconnect(false)
+{
+  bool visible = true;
+
+  setWindowIcon(Resources::GetAppIcon());
+  setAcceptDrops(true);
+  resize(m_width, m_height);
+  setVisible(visible);
+
+  SetVolume(100);
+  if (!visible)
+    ToggleMute();
+
+  LoadGeometry();
+  UpdateTitle();
+}
+
+GBAWidget::~GBAWidget()
+{
+  SaveGeometry();
+}
+
+void GBAWidget::GameChanged(std::string_view game_title, int width, int height)
+{
+  m_game_title = game_title;
+  m_width = width;
+  m_height = height;
+  UpdateTitle();
+  update();
+}
+
+void GBAWidget::SetVideoBuffer(std::vector<u32> video_buffer)
+{
+  m_video_buffer = std::move(video_buffer);
+  update();
+}
+
+void GBAWidget::SetVolume(int volume)
+{
+  m_muted = false;
+  m_volume = std::clamp(volume, 0, 100);
+  UpdateVolume();
+}
+
+void GBAWidget::VolumeDown()
+{
+  SetVolume(m_volume - 10);
+}
+
+void GBAWidget::VolumeUp()
+{
+  SetVolume(m_volume + 10);
+}
+
+bool GBAWidget::IsMuted()
+{
+  return m_muted;
+}
+
+void GBAWidget::ToggleMute()
+{
+  m_muted = !m_muted;
+  UpdateVolume();
+}
+
+void GBAWidget::ToggleDisconnect()
+{
+  if (!CanControlCore())
+    return;
+
+  m_force_disconnect = !m_force_disconnect;
+
+  Core::RunOnCPUThread(
+      [core = m_core, force_disconnect = m_force_disconnect] {
+        if (auto core_ptr = core.lock())
+          core_ptr->SetForceDisconnect(force_disconnect);
+      },
+      false);
+}
+
+void GBAWidget::LoadROM()
+{
+  if (!CanControlCore())
+    return;
+
+  std::string rom_path = GameCubePane::GetOpenGBARom("");
+  if (rom_path.empty())
+    return;
+
+  RestartCore(m_core, rom_path);
+}
+
+void GBAWidget::UnloadROM()
+{
+  if (!CanControlCore() || m_game_title.empty())
+    return;
+
+  RestartCore(m_core);
+}
+
+void GBAWidget::ResetCore()
+{
+  if (!CanResetCore())
+    return;
+
+  Pad::SetGBAReset(m_local_pad, true);
+}
+
+void GBAWidget::DoState(bool export_state)
+{
+  if (!CanControlCore() && !export_state)
+    return;
+
+  QString state_path = QDir::toNativeSeparators(
+      (export_state ? QFileDialog::getSaveFileName : QFileDialog::getOpenFileName)(
+          this, tr("Select a File"), QString(),
+          tr("mGBA Save States (*.ss0 *.ss1 *.ss2 *.ss3 *.ss4 *.ss5 *.ss6 *.ss7 *.ss8 *.ss9);;"
+             "All Files (*)"),
+          nullptr, QFileDialog::Options()));
+
+  if (state_path.isEmpty())
+    return;
+
+  Core::RunOnCPUThread(
+      [export_state, core = m_core, state_path = state_path.toStdString()] {
+        if (auto core_ptr = core.lock())
+        {
+          if (export_state)
+            core_ptr->ExportState(state_path);
+          else
+            core_ptr->ImportState(state_path);
+        }
+      },
+      false);
+}
+
+void GBAWidget::Resize(int scale)
+{
+  resize(m_width * scale, m_height * scale);
+}
+
+void GBAWidget::UpdateTitle()
+{
+  std::string title = fmt::format("GBA{}", m_device_number + 1);
+  if (!m_netplayer_name.empty())
+    title += " " + m_netplayer_name;
+
+  if (!m_game_title.empty())
+    title += " | " + m_game_title;
+
+  if (m_muted)
+    title += " | Muted";
+  else
+    title += fmt::format(" | Volume {}%", m_volume);
+
+  setWindowTitle(QString::fromStdString(title));
+}
+
+void GBAWidget::UpdateVolume()
+{
+  int volume = m_muted ? 0 : m_volume * 256 / 100;
+  g_sound_stream->GetMixer()->SetGBAVolume(m_device_number, volume, volume);
+  UpdateTitle();
+}
+
+void GBAWidget::LoadGeometry()
+{
+  const QSettings& settings = Settings::GetQSettings();
+  const QString key = QStringLiteral("gbawidget/geometry%1").arg(m_local_pad + 1);
+  if (settings.contains(key))
+    restoreGeometry(settings.value(key).toByteArray());
+}
+
+void GBAWidget::SaveGeometry()
+{
+  QSettings& settings = Settings::GetQSettings();
+  const QString key = QStringLiteral("gbawidget/geometry%1").arg(m_local_pad + 1);
+  settings.setValue(key, saveGeometry());
+}
+
+bool GBAWidget::CanControlCore()
+{
+  return !Movie::IsMovieActive() && !NetPlay::IsNetPlayRunning();
+}
+
+bool GBAWidget::CanResetCore()
+{
+  return m_is_local_pad;
+}
+
+void GBAWidget::closeEvent(QCloseEvent* event)
+{
+  event->ignore();
+}
+
+void GBAWidget::contextMenuEvent(QContextMenuEvent* event)
+{
+  auto* menu = new QMenu(this);
+  connect(menu, &QMenu::triggered, menu, &QMenu::deleteLater);
+
+  auto* disconnect_action =
+      new QAction(m_force_disconnect ? tr("Dis&connected") : tr("&Connected"), menu);
+  disconnect_action->setEnabled(CanControlCore());
+  disconnect_action->setCheckable(true);
+  disconnect_action->setChecked(!m_force_disconnect);
+  connect(disconnect_action, &QAction::triggered, this, &GBAWidget::ToggleDisconnect);
+
+  auto* load_action = new QAction(tr("L&oad ROM"), menu);
+  load_action->setEnabled(CanControlCore());
+  connect(load_action, &QAction::triggered, this, &GBAWidget::LoadROM);
+
+  auto* unload_action = new QAction(tr("&Unload ROM"), menu);
+  unload_action->setEnabled(CanControlCore() && !m_game_title.empty());
+  connect(unload_action, &QAction::triggered, this, &GBAWidget::UnloadROM);
+
+  auto* reset_action = new QAction(tr("&Reset"), menu);
+  reset_action->setEnabled(CanResetCore());
+  connect(reset_action, &QAction::triggered, this, &GBAWidget::ResetCore);
+
+  auto* mute_action = new QAction(tr("&Mute"), menu);
+  mute_action->setCheckable(true);
+  mute_action->setChecked(m_muted);
+  connect(mute_action, &QAction::triggered, this, &GBAWidget::ToggleMute);
+
+  auto* size_menu = new QMenu(tr("Window Size"), menu);
+
+  auto* x1_action = new QAction(tr("&1x"), size_menu);
+  connect(x1_action, &QAction::triggered, this, [this] { Resize(1); });
+  auto* x2_action = new QAction(tr("&2x"), size_menu);
+  connect(x2_action, &QAction::triggered, this, [this] { Resize(2); });
+  auto* x3_action = new QAction(tr("&3x"), size_menu);
+  connect(x3_action, &QAction::triggered, this, [this] { Resize(3); });
+  auto* x4_action = new QAction(tr("&4x"), size_menu);
+  connect(x4_action, &QAction::triggered, this, [this] { Resize(4); });
+
+  size_menu->addAction(x1_action);
+  size_menu->addAction(x2_action);
+  size_menu->addAction(x3_action);
+  size_menu->addAction(x4_action);
+
+  auto* state_menu = new QMenu(tr("Save State"), menu);
+
+  auto* import_action = new QAction(tr("&Import State"), state_menu);
+  import_action->setEnabled(CanControlCore());
+  connect(import_action, &QAction::triggered, this, [this] { DoState(false); });
+
+  auto* export_state = new QAction(tr("&Export State"), state_menu);
+  connect(export_state, &QAction::triggered, this, [this] { DoState(true); });
+
+  state_menu->addAction(import_action);
+  state_menu->addAction(export_state);
+
+  menu->addAction(disconnect_action);
+  menu->addSeparator();
+  menu->addAction(load_action);
+  menu->addAction(unload_action);
+  menu->addAction(reset_action);
+  menu->addSeparator();
+  menu->addMenu(state_menu);
+  menu->addSeparator();
+  menu->addAction(mute_action);
+  menu->addSeparator();
+  menu->addMenu(size_menu);
+
+  menu->move(event->globalPos());
+  menu->show();
+}
+
+void GBAWidget::paintEvent(QPaintEvent* event)
+{
+  QPainter painter(this);
+  painter.fillRect(QRect(QPoint(), size()), Qt::black);
+
+  if (m_video_buffer.size() == static_cast<size_t>(m_width * m_height))
+  {
+    QImage image(reinterpret_cast<const uchar*>(m_video_buffer.data()), m_width, m_height,
+                 QImage::Format_ARGB32);
+    image = image.convertToFormat(QImage::Format_RGB32);
+    image = image.rgbSwapped();
+
+    QSize widget_size = size();
+    if (widget_size == QSize(m_width, m_height))
+    {
+      painter.drawImage(QPoint(), image, QRect(0, 0, m_width, m_height));
+    }
+    else if (static_cast<float>(m_width) / m_height >
+             static_cast<float>(widget_size.width()) / widget_size.height())
+    {
+      int new_height = widget_size.width() * m_height / m_width;
+      painter.drawImage(
+          QRect(0, (widget_size.height() - new_height) / 2, widget_size.width(), new_height), image,
+          QRect(0, 0, m_width, m_height));
+    }
+    else
+    {
+      int new_width = widget_size.height() * m_width / m_height;
+      painter.drawImage(
+          QRect((widget_size.width() - new_width) / 2, 0, new_width, widget_size.height()), image,
+          QRect(0, 0, m_width, m_height));
+    }
+  }
+}
+
+void GBAWidget::dragEnterEvent(QDragEnterEvent* event)
+{
+  if (CanControlCore() && event->mimeData()->hasUrls())
+    event->acceptProposedAction();
+}
+
+void GBAWidget::dropEvent(QDropEvent* event)
+{
+  if (!CanControlCore())
+    return;
+
+  for (const QUrl& url : event->mimeData()->urls())
+  {
+    QFileInfo file_info(url.toLocalFile());
+    QString path = file_info.filePath();
+
+    if (!file_info.isFile())
+      continue;
+
+    if (!file_info.exists() || !file_info.isReadable())
+    {
+      ModalMessageBox::critical(this, tr("Error"), tr("Failed to open '%1'").arg(path));
+      continue;
+    }
+
+    if (file_info.suffix() == QStringLiteral("raw"))
+    {
+      Core::RunOnCPUThread(
+          [core = m_core, card_path = path.toStdString()] {
+            if (auto core_ptr = core.lock())
+              core_ptr->EReaderQueueCard(card_path);
+          },
+          false);
+    }
+    else
+    {
+      RestartCore(m_core, path.toStdString());
+    }
+  }
+}
+
+GBAWidgetController::~GBAWidgetController()
+{
+  m_widget->deleteLater();
+}
+
+void GBAWidgetController::Create(std::weak_ptr<HW::GBA::Core> core, int device_number,
+                                 std::string_view game_title, int width, int height)
+{
+  m_widget = new GBAWidget(std::move(core), device_number, game_title, width, height);
+}
+
+void GBAWidgetController::GameChanged(std::string_view game_title, int width, int height)
+{
+  m_widget->GameChanged(game_title, width, height);
+}
+
+void GBAWidgetController::FrameEnded(std::vector<u32> video_buffer)
+{
+  m_widget->SetVideoBuffer(std::move(video_buffer));
+}
diff --git a/Source/Core/DolphinQt/GBAWidget.h b/Source/Core/DolphinQt/GBAWidget.h
new file mode 100644
index 0000000000..24b2147cd1
--- /dev/null
+++ b/Source/Core/DolphinQt/GBAWidget.h
@@ -0,0 +1,96 @@
+// Copyright 2021 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include <QWidget>
+
+#include "Common/CommonTypes.h"
+
+namespace HW::GBA
+{
+class Core;
+}  // namespace HW::GBA
+
+class QCloseEvent;
+class QContextMenuEvent;
+class QDragEnterEvent;
+class QDropEvent;
+class QPaintEvent;
+
+class GBAWidget : public QWidget
+{
+  Q_OBJECT
+public:
+  explicit GBAWidget(std::weak_ptr<HW::GBA::Core> core, int device_number,
+                     std::string_view game_title, int width, int height, QWidget* parent = nullptr,
+                     Qt::WindowFlags flags = {});
+  ~GBAWidget();
+
+  void GameChanged(std::string_view game_title, int width, int height);
+  void SetVideoBuffer(std::vector<u32> video_buffer);
+
+  void SetVolume(int volume);
+  void VolumeDown();
+  void VolumeUp();
+  bool IsMuted();
+  void ToggleMute();
+  void ToggleDisconnect();
+
+  void LoadROM();
+  void UnloadROM();
+  void ResetCore();
+  void DoState(bool export_state);
+  void Resize(int scale);
+
+private:
+  void UpdateTitle();
+  void UpdateVolume();
+
+  void LoadGeometry();
+  void SaveGeometry();
+
+  bool CanControlCore();
+  bool CanResetCore();
+
+  void closeEvent(QCloseEvent* event) override;
+  void contextMenuEvent(QContextMenuEvent* event) override;
+  void paintEvent(QPaintEvent* event) override;
+
+  void dragEnterEvent(QDragEnterEvent* event) override;
+  void dropEvent(QDropEvent* event) override;
+
+  std::weak_ptr<HW::GBA::Core> m_core;
+  std::vector<u32> m_video_buffer;
+  int m_device_number;
+  int m_local_pad;
+  std::string m_game_title;
+  int m_width;
+  int m_height;
+  std::string m_netplayer_name;
+  bool m_is_local_pad;
+  int m_volume;
+  bool m_muted;
+  bool m_force_disconnect;
+};
+
+class GBAWidgetController : public QObject
+{
+  Q_OBJECT
+public:
+  explicit GBAWidgetController() = default;
+  ~GBAWidgetController();
+
+  void Create(std::weak_ptr<HW::GBA::Core> core, int device_number, std::string_view game_title,
+              int width, int height);
+  void GameChanged(std::string_view game_title, int width, int height);
+  void FrameEnded(std::vector<u32> video_buffer);
+
+private:
+  GBAWidget* m_widget{};
+};
diff --git a/Source/Core/DolphinQt/Host.cpp b/Source/Core/DolphinQt/Host.cpp
index 61cbc7036d..bc9d6103b3 100644
--- a/Source/Core/DolphinQt/Host.cpp
+++ b/Source/Core/DolphinQt/Host.cpp
@@ -24,6 +24,9 @@
 #include "Core/PowerPC/PowerPC.h"
 #include "Core/State.h"
 
+#ifdef HAS_LIBMGBA
+#include "DolphinQt/GBAWidget.h"
+#endif
 #include "DolphinQt/QtUtils/QueueOnObject.h"
 #include "DolphinQt/Settings.h"
 
@@ -115,6 +118,15 @@ void Host::SetRenderFullFocus(bool focus)
   m_render_full_focus = focus;
 }
 
+bool Host::GetGBAFocus()
+{
+#ifdef HAS_LIBMGBA
+  return qobject_cast<GBAWidget*>(QApplication::activeWindow()) != nullptr;
+#else
+  return false;
+#endif
+}
+
 bool Host::GetRenderFullscreen()
 {
   return m_render_fullscreen;
@@ -167,7 +179,7 @@ void Host_UpdateTitle(const std::string& title)
 
 bool Host_RendererHasFocus()
 {
-  return Host::GetInstance()->GetRenderFocus();
+  return Host::GetInstance()->GetRenderFocus() || Host::GetInstance()->GetGBAFocus();
 }
 
 bool Host_RendererHasFullFocus()
@@ -230,7 +242,9 @@ void Host_TitleChanged()
 #endif
 }
 
+#ifndef HAS_LIBMGBA
 std::unique_ptr<GBAHostInterface> Host_CreateGBAHost(std::weak_ptr<HW::GBA::Core> core)
 {
   return nullptr;
 }
+#endif
diff --git a/Source/Core/DolphinQt/Host.h b/Source/Core/DolphinQt/Host.h
index 287333ac04..6ddc4cb3e4 100644
--- a/Source/Core/DolphinQt/Host.h
+++ b/Source/Core/DolphinQt/Host.h
@@ -27,6 +27,7 @@ public:
   bool GetRenderFocus();
   bool GetRenderFullFocus();
   bool GetRenderFullscreen();
+  bool GetGBAFocus();
 
   void SetMainWindowHandle(void* handle);
   void SetRenderHandle(void* handle);