23 files changed, 330 insertions, 95 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index c7b899131..5c99c00f5 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -517,6 +517,8 @@ add_library(core STATIC
     hle/service/psc/psc.h
     hle/service/ptm/psm.cpp
     hle/service/ptm/psm.h
+    hle/service/kernel_helpers.cpp
+    hle/service/kernel_helpers.h
     hle/service/service.cpp
     hle/service/service.h
     hle/service/set/set.cpp
diff --git a/src/core/hle/kernel/hle_ipc.cpp b/src/core/hle/kernel/hle_ipc.cpp
index 28ed6265a..ca68fc325 100644
--- a/src/core/hle/kernel/hle_ipc.cpp
+++ b/src/core/hle/kernel/hle_ipc.cpp
@@ -58,6 +58,9 @@ bool SessionRequestManager::HasSessionRequestHandler(const HLERequestContext& co
 
 void SessionRequestHandler::ClientConnected(KServerSession* session) {
     session->ClientConnected(shared_from_this());
+
+    // Ensure our server session is tracked globally.
+    kernel.RegisterServerSession(session);
 }
 
 void SessionRequestHandler::ClientDisconnected(KServerSession* session) {
diff --git a/src/core/hle/kernel/k_auto_object.cpp b/src/core/hle/kernel/k_auto_object.cpp
index dbe237f09..c99a9ebb7 100644
--- a/src/core/hle/kernel/k_auto_object.cpp
+++ b/src/core/hle/kernel/k_auto_object.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include "core/hle/kernel/k_auto_object.h"
+#include "core/hle/kernel/kernel.h"
 
 namespace Kernel {
 
@@ -11,4 +12,12 @@ KAutoObject* KAutoObject::Create(KAutoObject* obj) {
     return obj;
 }
 
+void KAutoObject::RegisterWithKernel() {
+    kernel.RegisterKernelObject(this);
+}
+
+void KAutoObject::UnregisterWithKernel() {
+    kernel.UnregisterKernelObject(this);
+}
+
 } // namespace Kernel
diff --git a/src/core/hle/kernel/k_auto_object.h b/src/core/hle/kernel/k_auto_object.h
index 88a052f65..e4fcdbc67 100644
--- a/src/core/hle/kernel/k_auto_object.h
+++ b/src/core/hle/kernel/k_auto_object.h
@@ -85,8 +85,12 @@ private:
     KERNEL_AUTOOBJECT_TRAITS(KAutoObject, KAutoObject);
 
 public:
-    explicit KAutoObject(KernelCore& kernel_) : kernel(kernel_) {}
-    virtual ~KAutoObject() = default;
+    explicit KAutoObject(KernelCore& kernel_) : kernel(kernel_) {
+        RegisterWithKernel();
+    }
+    virtual ~KAutoObject() {
+        UnregisterWithKernel();
+    }
 
     static KAutoObject* Create(KAutoObject* ptr);
 
@@ -166,6 +170,10 @@ public:
         }
     }
 
+private:
+    void RegisterWithKernel();
+    void UnregisterWithKernel();
+
 protected:
     KernelCore& kernel;
     std::string name;
diff --git a/src/core/hle/kernel/k_process.cpp b/src/core/hle/kernel/k_process.cpp
index d1bd98051..8ead1a769 100644
--- a/src/core/hle/kernel/k_process.cpp
+++ b/src/core/hle/kernel/k_process.cpp
@@ -10,6 +10,7 @@
 #include "common/alignment.h"
 #include "common/assert.h"
 #include "common/logging/log.h"
+#include "common/scope_exit.h"
 #include "common/settings.h"
 #include "core/core.h"
 #include "core/device_memory.h"
@@ -43,6 +44,8 @@ void SetupMainThread(Core::System& system, KProcess& owner_process, u32 priority
     ASSERT(owner_process.GetResourceLimit()->Reserve(LimitableResource::Threads, 1));
 
     KThread* thread = KThread::Create(system.Kernel());
+    SCOPE_EXIT({ thread->Close(); });
+
     ASSERT(KThread::InitializeUserThread(system, thread, entry_point, 0, stack_top, priority,
                                          owner_process.GetIdealCoreId(), &owner_process)
                .IsSuccess());
@@ -162,7 +165,7 @@ void KProcess::DecrementThreadCount() {
     ASSERT(num_threads > 0);
 
     if (const auto count = --num_threads; count == 0) {
-        UNIMPLEMENTED_MSG("Process termination is not implemented!");
+        LOG_WARNING(Kernel, "Process termination is not fully implemented.");
     }
 }
 
@@ -406,6 +409,9 @@ void KProcess::Finalize() {
         resource_limit->Close();
     }
 
+    // Finalize the handle table and close any open handles.
+    handle_table.Finalize();
+
     // Perform inherited finalization.
     KAutoObjectWithSlabHeapAndContainer<KProcess, KSynchronizationObject>::Finalize();
 }
diff --git a/src/core/hle/kernel/k_server_session.cpp b/src/core/hle/kernel/k_server_session.cpp
index 5c3c13ce6..b9f24475c 100644
--- a/src/core/hle/kernel/k_server_session.cpp
+++ b/src/core/hle/kernel/k_server_session.cpp
@@ -28,7 +28,10 @@ namespace Kernel {
 
 KServerSession::KServerSession(KernelCore& kernel_) : KSynchronizationObject{kernel_} {}
 
-KServerSession::~KServerSession() {}
+KServerSession::~KServerSession() {
+    // Ensure that the global list tracking server sessions does not hold on to a reference.
+    kernel.UnregisterServerSession(this);
+}
 
 void KServerSession::Initialize(KSession* parent_session_, std::string&& name_,
                                 std::shared_ptr<SessionRequestManager> manager_) {
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index 64bd0c494..92fbc5532 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -61,6 +61,7 @@ struct KernelCore::Impl {
     void Initialize(KernelCore& kernel) {
         global_scheduler_context = std::make_unique<Kernel::GlobalSchedulerContext>(kernel);
         global_handle_table = std::make_unique<Kernel::KHandleTable>(kernel);
+        global_handle_table->Initialize(KHandleTable::MaxTableSize);
 
         is_phantom_mode_for_singlecore = false;
 
@@ -90,9 +91,39 @@ struct KernelCore::Impl {
     }
 
     void Shutdown() {
+        // Shutdown all processes.
+        if (current_process) {
+            current_process->Finalize();
+            current_process->Close();
+            current_process = nullptr;
+        }
         process_list.clear();
 
-        // Ensures all service threads gracefully shutdown
+        // Close all open server ports.
+        std::unordered_set<KServerPort*> server_ports_;
+        {
+            std::lock_guard lk(server_ports_lock);
+            server_ports_ = server_ports;
+            server_ports.clear();
+        }
+        for (auto* server_port : server_ports_) {
+            server_port->Close();
+        }
+        // Close all open server sessions.
+        std::unordered_set<KServerSession*> server_sessions_;
+        {
+            std::lock_guard lk(server_sessions_lock);
+            server_sessions_ = server_sessions;
+            server_sessions.clear();
+        }
+        for (auto* server_session : server_sessions_) {
+            server_session->Close();
+        }
+
+        // Ensure that the object list container is finalized and properly shutdown.
+        object_list_container.Finalize();
+
+        // Ensures all service threads gracefully shutdown.
         service_threads.clear();
 
         next_object_id = 0;
@@ -111,11 +142,7 @@ struct KernelCore::Impl {
 
         cores.clear();
 
-        if (current_process) {
-            current_process->Close();
-            current_process = nullptr;
-        }
-
+        global_handle_table->Finalize();
         global_handle_table.reset();
 
         preemption_event = nullptr;
@@ -142,6 +169,16 @@ struct KernelCore::Impl {
 
         // Next host thead ID to use, 0-3 IDs represent core threads, >3 represent others
         next_host_thread_id = Core::Hardware::NUM_CPU_CORES;
+
+        // Track kernel objects that were not freed on shutdown
+        {
+            std::lock_guard lk(registered_objects_lock);
+            if (registered_objects.size()) {
+                LOG_WARNING(Kernel, "{} kernel objects were dangling on shutdown!",
+                            registered_objects.size());
+                registered_objects.clear();
+            }
+        }
     }
 
     void InitializePhysicalCores() {
@@ -630,6 +667,21 @@ struct KernelCore::Impl {
             user_slab_heap_size);
     }
 
+    KClientPort* CreateNamedServicePort(std::string name) {
+        auto search = service_interface_factory.find(name);
+        if (search == service_interface_factory.end()) {
+            UNIMPLEMENTED();
+            return {};
+        }
+
+        KClientPort* port = &search->second(system.ServiceManager(), system);
+        {
+            std::lock_guard lk(server_ports_lock);
+            server_ports.insert(&port->GetParent()->GetServerPort());
+        }
+        return port;
+    }
+
     std::atomic<u32> next_object_id{0};
     std::atomic<u64> next_kernel_process_id{KProcess::InitialKIPIDMin};
     std::atomic<u64> next_user_process_id{KProcess::ProcessIDMin};
@@ -656,6 +708,12 @@ struct KernelCore::Impl {
     /// the ConnectToPort SVC.
     std::unordered_map<std::string, ServiceInterfaceFactory> service_interface_factory;
     NamedPortTable named_ports;
+    std::unordered_set<KServerPort*> server_ports;
+    std::unordered_set<KServerSession*> server_sessions;
+    std::unordered_set<KAutoObject*> registered_objects;
+    std::mutex server_ports_lock;
+    std::mutex server_sessions_lock;
+    std::mutex registered_objects_lock;
 
     std::unique_ptr<Core::ExclusiveMonitor> exclusive_monitor;
     std::vector<Kernel::PhysicalCore> cores;
@@ -844,12 +902,27 @@ void KernelCore::RegisterNamedService(std::string name, ServiceInterfaceFactory&
 }
 
 KClientPort* KernelCore::CreateNamedServicePort(std::string name) {
-    auto search = impl->service_interface_factory.find(name);
-    if (search == impl->service_interface_factory.end()) {
-        UNIMPLEMENTED();
-        return {};
-    }
-    return &search->second(impl->system.ServiceManager(), impl->system);
+    return impl->CreateNamedServicePort(std::move(name));
+}
+
+void KernelCore::RegisterServerSession(KServerSession* server_session) {
+    std::lock_guard lk(impl->server_sessions_lock);
+    impl->server_sessions.insert(server_session);
+}
+
+void KernelCore::UnregisterServerSession(KServerSession* server_session) {
+    std::lock_guard lk(impl->server_sessions_lock);
+    impl->server_sessions.erase(server_session);
+}
+
+void KernelCore::RegisterKernelObject(KAutoObject* object) {
+    std::lock_guard lk(impl->registered_objects_lock);
+    impl->registered_objects.insert(object);
+}
+
+void KernelCore::UnregisterKernelObject(KAutoObject* object) {
+    std::lock_guard lk(impl->registered_objects_lock);
+    impl->registered_objects.erase(object);
 }
 
 bool KernelCore::IsValidNamedPort(NamedPortTable::const_iterator port) const {
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 2d01e1ae0..3a6db0b1c 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -45,6 +45,7 @@ class KPort;
 class KProcess;
 class KResourceLimit;
 class KScheduler;
+class KServerSession;
 class KSession;
 class KSharedMemory;
 class KThread;
@@ -185,6 +186,22 @@ public:
     /// Opens a port to a service previously registered with RegisterNamedService.
     KClientPort* CreateNamedServicePort(std::string name);
 
+    /// Registers a server session with the gobal emulation state, to be freed on shutdown. This is
+    /// necessary because we do not emulate processes for HLE sessions.
+    void RegisterServerSession(KServerSession* server_session);
+
+    /// Unregisters a server session previously registered with RegisterServerSession when it was
+    /// destroyed during the current emulation session.
+    void UnregisterServerSession(KServerSession* server_session);
+
+    /// Registers all kernel objects with the global emulation state, this is purely for tracking
+    /// leaks after emulation has been shutdown.
+    void RegisterKernelObject(KAutoObject* object);
+
+    /// Unregisters a kernel object previously registered with RegisterKernelObject when it was
+    /// destroyed during the current emulation session.
+    void UnregisterKernelObject(KAutoObject* object);
+
     /// Determines whether or not the given port is a valid named port.
     bool IsValidNamedPort(NamedPortTable::const_iterator port) const;
 
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 8339e11a0..2eb532472 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -298,6 +298,7 @@ static ResultCode ConnectToNamedPort(Core::System& system, Handle* out, VAddr po
     // Create a session.
     KClientSession* session{};
     R_TRY(port->CreateSession(std::addressof(session)));
+    port->Close();
 
     // Register the session in the table, close the extra reference.
     handle_table.Register(*out, session);
@@ -1439,11 +1440,6 @@ static void ExitProcess(Core::System& system) {
     LOG_INFO(Kernel_SVC, "Process {} exiting", current_process->GetProcessID());
     ASSERT_MSG(current_process->GetStatus() == ProcessStatus::Running,
                "Process has already exited");
-
-    current_process->PrepareForTermination();
-
-    // Kill the current thread
-    system.Kernel().CurrentScheduler()->GetCurrentThread()->Exit();
 }
 
 static void ExitProcess32(Core::System& system) {
diff --git a/src/core/hle/service/hid/controllers/npad.cpp b/src/core/hle/service/hid/controllers/npad.cpp
index 6ce1360e3..b7f551e40 100644
--- a/src/core/hle/service/hid/controllers/npad.cpp
+++ b/src/core/hle/service/hid/controllers/npad.cpp
@@ -18,6 +18,7 @@
 #include "core/hle/kernel/k_writable_event.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/service/hid/controllers/npad.h"
+#include "core/hle/service/kernel_helpers.h"
 
 namespace Service::HID {
 constexpr s32 HID_JOYSTICK_MAX = 0x7fff;
@@ -147,7 +148,9 @@ bool Controller_NPad::IsDeviceHandleValid(const DeviceHandle& device_handle) {
            device_handle.device_index < DeviceIndex::MaxDeviceIndex;
 }
 
-Controller_NPad::Controller_NPad(Core::System& system_) : ControllerBase{system_} {
+Controller_NPad::Controller_NPad(Core::System& system_,
+                                 KernelHelpers::ServiceContext& service_context_)
+    : ControllerBase{system_}, service_context{service_context_} {
     latest_vibration_values.fill({DEFAULT_VIBRATION_VALUE, DEFAULT_VIBRATION_VALUE});
 }
 
@@ -251,10 +254,9 @@ void Controller_NPad::InitNewlyAddedController(std::size_t controller_idx) {
 }
 
 void Controller_NPad::OnInit() {
-    auto& kernel = system.Kernel();
     for (std::size_t i = 0; i < styleset_changed_events.size(); ++i) {
-        styleset_changed_events[i] = Kernel::KEvent::Create(kernel);
-        styleset_changed_events[i]->Initialize(fmt::format("npad:NpadStyleSetChanged_{}", i));
+        styleset_changed_events[i] =
+            service_context.CreateEvent(fmt::format("npad:NpadStyleSetChanged_{}", i));
     }
 
     if (!IsControllerActivated()) {
@@ -344,8 +346,7 @@ void Controller_NPad::OnRelease() {
     }
 
     for (std::size_t i = 0; i < styleset_changed_events.size(); ++i) {
-        styleset_changed_events[i]->Close();
-        styleset_changed_events[i] = nullptr;
+        service_context.CloseEvent(styleset_changed_events[i]);
     }
 }
 
diff --git a/src/core/hle/service/hid/controllers/npad.h b/src/core/hle/service/hid/controllers/npad.h
index 1409d82a2..4fcc6f93a 100644
--- a/src/core/hle/service/hid/controllers/npad.h
+++ b/src/core/hle/service/hid/controllers/npad.h
@@ -20,6 +20,10 @@ class KEvent;
 class KReadableEvent;
 } // namespace Kernel
 
+namespace Service::KernelHelpers {
+class ServiceContext;
+}
+
 namespace Service::HID {
 
 constexpr u32 NPAD_HANDHELD = 32;
@@ -27,7 +31,8 @@ constexpr u32 NPAD_UNKNOWN = 16; // TODO(ogniK): What is this?
 
 class Controller_NPad final : public ControllerBase {
 public:
-    explicit Controller_NPad(Core::System& system_);
+    explicit Controller_NPad(Core::System& system_,
+                             KernelHelpers::ServiceContext& service_context_);
     ~Controller_NPad() override;
 
     // Called when the controller is initialized
@@ -566,6 +571,7 @@ private:
         std::array<std::unique_ptr<Input::MotionDevice>, Settings::NativeMotion::NUM_MOTIONS_HID>,
         10>;
 
+    KernelHelpers::ServiceContext& service_context;
     std::mutex mutex;
     ButtonArray buttons;
     StickArray sticks;
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index d68b023d0..b8b80570d 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -46,8 +46,9 @@ constexpr auto pad_update_ns = std::chrono::nanoseconds{1000 * 1000};         //
 constexpr auto motion_update_ns = std::chrono::nanoseconds{15 * 1000 * 1000}; // (15ms, 66.666Hz)
 constexpr std::size_t SHARED_MEMORY_SIZE = 0x40000;
 
-IAppletResource::IAppletResource(Core::System& system_)
-    : ServiceFramework{system_, "IAppletResource"} {
+IAppletResource::IAppletResource(Core::System& system_,
+                                 KernelHelpers::ServiceContext& service_context_)
+    : ServiceFramework{system_, "IAppletResource"}, service_context{service_context_} {
     static const FunctionInfo functions[] = {
         {0, &IAppletResource::GetSharedMemoryHandle, "GetSharedMemoryHandle"},
     };
@@ -63,7 +64,7 @@ IAppletResource::IAppletResource(Core::System& system_)
     MakeController<Controller_Stubbed>(HidController::CaptureButton);
     MakeController<Controller_Stubbed>(HidController::InputDetector);
     MakeController<Controller_Stubbed>(HidController::UniquePad);
-    MakeController<Controller_NPad>(HidController::NPad);
+    MakeControllerWithServiceContext<Controller_NPad>(HidController::NPad);
     MakeController<Controller_Gesture>(HidController::Gesture);
     MakeController<Controller_ConsoleSixAxis>(HidController::ConsoleSixAxisSensor);
 
@@ -191,13 +192,14 @@ private:
 
 std::shared_ptr<IAppletResource> Hid::GetAppletResource() {
     if (applet_resource == nullptr) {
-        applet_resource = std::make_shared<IAppletResource>(system);
+        applet_resource = std::make_shared<IAppletResource>(system, service_context);
     }
 
     return applet_resource;
 }
 
-Hid::Hid(Core::System& system_) : ServiceFramework{system_, "hid"} {
+Hid::Hid(Core::System& system_)
+    : ServiceFramework{system_, "hid"}, service_context{system_, service_name} {
     // clang-format off
     static const FunctionInfo functions[] = {
         {0, &Hid::CreateAppletResource, "CreateAppletResource"},
@@ -347,7 +349,7 @@ void Hid::CreateAppletResource(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_HID, "called, applet_resource_user_id={}", applet_resource_user_id);
 
     if (applet_resource == nullptr) {
-        applet_resource = std::make_shared<IAppletResource>(system);
+        applet_resource = std::make_shared<IAppletResource>(system, service_context);
     }
 
     IPC::ResponseBuilder rb{ctx, 2, 0, 1};
diff --git a/src/core/hle/service/hid/hid.h b/src/core/hle/service/hid/hid.h
index 83fc2ea1d..9c5c7f252 100644
--- a/src/core/hle/service/hid/hid.h
+++ b/src/core/hle/service/hid/hid.h
@@ -7,6 +7,7 @@
 #include <chrono>
 
 #include "core/hle/service/hid/controllers/controller_base.h"
+#include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/service.h"
 
 namespace Core::Timing {
@@ -39,7 +40,8 @@ enum class HidController : std::size_t {
 
 class IAppletResource final : public ServiceFramework<IAppletResource> {
 public:
-    explicit IAppletResource(Core::System& system_);
+    explicit IAppletResource(Core::System& system_,
+                             KernelHelpers::ServiceContext& service_context_);
     ~IAppletResource() override;
 
     void ActivateController(HidController controller);
@@ -60,11 +62,18 @@ private:
     void MakeController(HidController controller) {
         controllers[static_cast<std::size_t>(controller)] = std::make_unique<T>(system);
     }
+    template <typename T>
+    void MakeControllerWithServiceContext(HidController controller) {
+        controllers[static_cast<std::size_t>(controller)] =
+            std::make_unique<T>(system, service_context);
+    }
 
     void GetSharedMemoryHandle(Kernel::HLERequestContext& ctx);
     void UpdateControllers(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
     void UpdateMotion(std::uintptr_t user_data, std::chrono::nanoseconds ns_late);
 
+    KernelHelpers::ServiceContext& service_context;
+
     std::shared_ptr<Core::Timing::EventType> pad_update_event;
     std::shared_ptr<Core::Timing::EventType> motion_update_event;
 
@@ -176,6 +185,8 @@ private:
     static_assert(sizeof(VibrationDeviceInfo) == 0x8, "VibrationDeviceInfo has incorrect size.");
 
     std::shared_ptr<IAppletResource> applet_resource;
+
+    KernelHelpers::ServiceContext service_context;
 };
 
 /// Reload input devices. Used when input configuration changed
diff --git a/src/core/hle/service/kernel_helpers.cpp b/src/core/hle/service/kernel_helpers.cpp
new file mode 100644
index 000000000..62f4cdfb2
--- /dev/null
+++ b/src/core/hle/service/kernel_helpers.cpp
@@ -0,0 +1,62 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/core.h"
+#include "core/hle/kernel/k_event.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_readable_event.h"
+#include "core/hle/kernel/k_resource_limit.h"
+#include "core/hle/kernel/k_scoped_resource_reservation.h"
+#include "core/hle/kernel/k_writable_event.h"
+#include "core/hle/service/kernel_helpers.h"
+
+namespace Service::KernelHelpers {
+
+ServiceContext::ServiceContext(Core::System& system_, std::string name_)
+    : kernel(system_.Kernel()) {
+    process = Kernel::KProcess::Create(kernel);
+    ASSERT(Kernel::KProcess::Initialize(process, system_, std::move(name_),
+                                        Kernel::KProcess::ProcessType::Userland)
+               .IsSuccess());
+}
+
+ServiceContext::~ServiceContext() {
+    process->Close();
+    process = nullptr;
+}
+
+Kernel::KEvent* ServiceContext::CreateEvent(std::string&& name) {
+    // Reserve a new event from the process resource limit
+    Kernel::KScopedResourceReservation event_reservation(process,
+                                                         Kernel::LimitableResource::Events);
+    if (!event_reservation.Succeeded()) {
+        LOG_CRITICAL(Service, "Resource limit reached!");
+        return {};
+    }
+
+    // Create a new event.
+    auto* event = Kernel::KEvent::Create(kernel);
+    if (!event) {
+        LOG_CRITICAL(Service, "Unable to create event!");
+        return {};
+    }
+
+    // Initialize the event.
+    event->Initialize(std::move(name));
+
+    // Commit the thread reservation.
+    event_reservation.Commit();
+
+    // Register the event.
+    Kernel::KEvent::Register(kernel, event);
+
+    return event;
+}
+
+void ServiceContext::CloseEvent(Kernel::KEvent* event) {
+    event->GetReadableEvent().Close();
+    event->GetWritableEvent().Close();
+}
+
+} // namespace Service::KernelHelpers
diff --git a/src/core/hle/service/kernel_helpers.h b/src/core/hle/service/kernel_helpers.h
new file mode 100644
index 000000000..4f3e95f67
--- /dev/null
+++ b/src/core/hle/service/kernel_helpers.h
@@ -0,0 +1,35 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+namespace Core {
+class System;
+}
+
+namespace Kernel {
+class KernelCore;
+class KEvent;
+class KProcess;
+} // namespace Kernel
+
+namespace Service::KernelHelpers {
+
+class ServiceContext {
+public:
+    ServiceContext(Core::System& system_, std::string name_);
+    ~ServiceContext();
+
+    Kernel::KEvent* CreateEvent(std::string&& name);
+
+    void CloseEvent(Kernel::KEvent* event);
+
+private:
+    Kernel::KernelCore& kernel;
+    Kernel::KProcess* process{};
+};
+
+} // namespace Service::KernelHelpers
diff --git a/src/core/hle/service/nvdrv/nvdrv.cpp b/src/core/hle/service/nvdrv/nvdrv.cpp
index 03992af5e..ff405099a 100644
--- a/src/core/hle/service/nvdrv/nvdrv.cpp
+++ b/src/core/hle/service/nvdrv/nvdrv.cpp
@@ -39,11 +39,11 @@ void InstallInterfaces(SM::ServiceManager& service_manager, NVFlinger::NVFlinger
     nvflinger.SetNVDrvInstance(module_);
 }
 
-Module::Module(Core::System& system) : syncpoint_manager{system.GPU()} {
-    auto& kernel = system.Kernel();
+Module::Module(Core::System& system)
+    : syncpoint_manager{system.GPU()}, service_context{system, "nvdrv"} {
     for (u32 i = 0; i < MaxNvEvents; i++) {
-        events_interface.events[i].event = Kernel::KEvent::Create(kernel);
-        events_interface.events[i].event->Initialize(fmt::format("NVDRV::NvEvent_{}", i));
+        events_interface.events[i].event =
+            service_context.CreateEvent(fmt::format("NVDRV::NvEvent_{}", i));
         events_interface.status[i] = EventState::Free;
         events_interface.registered[i] = false;
     }
@@ -65,8 +65,7 @@ Module::Module(Core::System& system) : syncpoint_manager{system.GPU()} {
 
 Module::~Module() {
     for (u32 i = 0; i < MaxNvEvents; i++) {
-        events_interface.events[i].event->Close();
-        events_interface.events[i].event = nullptr;
+        service_context.CloseEvent(events_interface.events[i].event);
     }
 }
 
diff --git a/src/core/hle/service/nvdrv/nvdrv.h b/src/core/hle/service/nvdrv/nvdrv.h
index a43ceb7ae..e2a1dde5b 100644
--- a/src/core/hle/service/nvdrv/nvdrv.h
+++ b/src/core/hle/service/nvdrv/nvdrv.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "common/common_types.h"
+#include "core/hle/service/kernel_helpers.h"
 #include "core/hle/service/nvdrv/nvdata.h"
 #include "core/hle/service/nvdrv/syncpoint_manager.h"
 #include "core/hle/service/service.h"
@@ -154,6 +155,8 @@ private:
     std::unordered_map<std::string, std::shared_ptr<Devices::nvdevice>> devices;
 
     EventInterface events_interface;
+
+    KernelHelpers::ServiceContext service_context;
 };
 
 /// Registers all NVDRV services with the specified service manager.
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index e6fba88b2..b3e50433b 100644
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -104,23 +104,22 @@ ServiceFrameworkBase::~ServiceFrameworkBase() {
 void ServiceFrameworkBase::InstallAsService(SM::ServiceManager& service_manager) {
     const auto guard = LockService();
 
-    ASSERT(!port_installed);
+    ASSERT(!service_registered);
 
-    auto port = service_manager.RegisterService(service_name, max_sessions).Unwrap();
-    port->SetSessionHandler(shared_from_this());
-    port_installed = true;
+    service_manager.RegisterService(service_name, max_sessions, shared_from_this());
+    service_registered = true;
 }
 
 Kernel::KClientPort& ServiceFrameworkBase::CreatePort() {
     const auto guard = LockService();
 
-    ASSERT(!port_installed);
+    ASSERT(!service_registered);
 
     auto* port = Kernel::KPort::Create(kernel);
     port->Initialize(max_sessions, false, service_name);
     port->GetServerPort().SetSessionHandler(shared_from_this());
 
-    port_installed = true;
+    service_registered = true;
 
     return port->GetClientPort();
 }
diff --git a/src/core/hle/service/service.h b/src/core/hle/service/service.h
index e078ac176..c9d6b879d 100644
--- a/src/core/hle/service/service.h
+++ b/src/core/hle/service/service.h
@@ -96,6 +96,9 @@ protected:
     /// System context that the service operates under.
     Core::System& system;
 
+    /// Identifier string used to connect to the service.
+    std::string service_name;
+
 private:
     template <typename T>
     friend class ServiceFramework;
@@ -117,14 +120,12 @@ private:
     void RegisterHandlersBaseTipc(const FunctionInfoBase* functions, std::size_t n);
     void ReportUnimplementedFunction(Kernel::HLERequestContext& ctx, const FunctionInfoBase* info);
 
-    /// Identifier string used to connect to the service.
-    std::string service_name;
     /// Maximum number of concurrent sessions that this service can handle.
     u32 max_sessions;
 
     /// Flag to store if a port was already create/installed to detect multiple install attempts,
     /// which is not supported.
-    bool port_installed = false;
+    bool service_registered = false;
 
     /// Function used to safely up-cast pointers to the derived class before invoking a handler.
     InvokerFn* handler_invoker;
diff --git a/src/core/hle/service/sm/sm.cpp b/src/core/hle/service/sm/sm.cpp
index 15034abed..ae4dc4a75 100644
--- a/src/core/hle/service/sm/sm.cpp
+++ b/src/core/hle/service/sm/sm.cpp
@@ -4,6 +4,7 @@
 
 #include <tuple>
 #include "common/assert.h"
+#include "common/scope_exit.h"
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/k_client_port.h"
@@ -40,17 +41,13 @@ static ResultCode ValidateServiceName(const std::string& name) {
 }
 
 Kernel::KClientPort& ServiceManager::InterfaceFactory(ServiceManager& self, Core::System& system) {
-    ASSERT(self.sm_interface.expired());
-
-    auto sm = std::make_shared<SM>(self, system);
-    self.sm_interface = sm;
+    self.sm_interface = std::make_shared<SM>(self, system);
     self.controller_interface = std::make_unique<Controller>(system);
-
-    return sm->CreatePort();
+    return self.sm_interface->CreatePort();
 }
 
-ResultVal<Kernel::KServerPort*> ServiceManager::RegisterService(std::string name,
-                                                                u32 max_sessions) {
+ResultCode ServiceManager::RegisterService(std::string name, u32 max_sessions,
+                                           Kernel::SessionRequestHandlerPtr handler) {
 
     CASCADE_CODE(ValidateServiceName(name));
 
@@ -59,12 +56,9 @@ ResultVal<Kernel::KServerPort*> ServiceManager::RegisterService(std::string name
         return ERR_ALREADY_REGISTERED;
     }
 
-    auto* port = Kernel::KPort::Create(kernel);
-    port->Initialize(max_sessions, false, name);
+    registered_services.emplace(std::move(name), handler);
 
-    registered_services.emplace(std::move(name), port);
-
-    return MakeResult(&port->GetServerPort());
+    return ResultSuccess;
 }
 
 ResultCode ServiceManager::UnregisterService(const std::string& name) {
@@ -76,14 +70,11 @@ ResultCode ServiceManager::UnregisterService(const std::string& name) {
         return ERR_SERVICE_NOT_REGISTERED;
     }
 
-    iter->second->Close();
-
     registered_services.erase(iter);
     return ResultSuccess;
 }
 
 ResultVal<Kernel::KPort*> ServiceManager::GetServicePort(const std::string& name) {
-
     CASCADE_CODE(ValidateServiceName(name));
     auto it = registered_services.find(name);
     if (it == registered_services.end()) {
@@ -91,10 +82,13 @@ ResultVal<Kernel::KPort*> ServiceManager::GetServicePort(const std::string& name
         return ERR_SERVICE_NOT_REGISTERED;
     }
 
-    return MakeResult(it->second);
-}
+    auto* port = Kernel::KPort::Create(kernel);
+    port->Initialize(ServerSessionCountMax, false, name);
+    auto handler = it->second;
+    port->GetServerPort().SetSessionHandler(std::move(handler));
 
-SM::~SM() = default;
+    return MakeResult(port);
+}
 
 /**
  * SM::Initialize service function
@@ -156,11 +150,15 @@ ResultVal<Kernel::KClientSession*> SM::GetServiceImpl(Kernel::HLERequestContext&
         LOG_ERROR(Service_SM, "called service={} -> error 0x{:08X}", name, port_result.Code().raw);
         return port_result.Code();
     }
-    auto& port = port_result.Unwrap()->GetClientPort();
+    auto& port = port_result.Unwrap();
+    SCOPE_EXIT({ port->GetClientPort().Close(); });
+
+    server_ports.emplace_back(&port->GetServerPort());
 
     // Create a new session.
     Kernel::KClientSession* session{};
-    if (const auto result = port.CreateSession(std::addressof(session)); result.IsError()) {
+    if (const auto result = port->GetClientPort().CreateSession(std::addressof(session));
+        result.IsError()) {
         LOG_ERROR(Service_SM, "called service={} -> error 0x{:08X}", name, result.raw);
         return result;
     }
@@ -180,20 +178,21 @@ void SM::RegisterService(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_SM, "called with name={}, max_session_count={}, is_light={}", name,
               max_session_count, is_light);
 
-    auto handle = service_manager.RegisterService(name, max_session_count);
-    if (handle.Failed()) {
-        LOG_ERROR(Service_SM, "failed to register service with error_code={:08X}",
-                  handle.Code().raw);
+    if (const auto result = service_manager.RegisterService(name, max_session_count, nullptr);
+        result.IsError()) {
+        LOG_ERROR(Service_SM, "failed to register service with error_code={:08X}", result.raw);
         IPC::ResponseBuilder rb{ctx, 2};
-        rb.Push(handle.Code());
+        rb.Push(result);
         return;
     }
 
-    IPC::ResponseBuilder rb{ctx, 2, 0, 1, IPC::ResponseBuilder::Flags::AlwaysMoveHandles};
-    rb.Push(handle.Code());
+    auto* port = Kernel::KPort::Create(kernel);
+    port->Initialize(ServerSessionCountMax, is_light, name);
+    SCOPE_EXIT({ port->GetClientPort().Close(); });
 
-    auto server_port = handle.Unwrap();
-    rb.PushMoveObjects(server_port);
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1, IPC::ResponseBuilder::Flags::AlwaysMoveHandles};
+    rb.Push(ResultSuccess);
+    rb.PushMoveObjects(port->GetServerPort());
 }
 
 void SM::UnregisterService(Kernel::HLERequestContext& ctx) {
@@ -225,4 +224,10 @@ SM::SM(ServiceManager& service_manager_, Core::System& system_)
     });
 }
 
+SM::~SM() {
+    for (auto& server_port : server_ports) {
+        server_port->Close();
+    }
+}
+
 } // namespace Service::SM
diff --git a/src/core/hle/service/sm/sm.h b/src/core/hle/service/sm/sm.h
index ea37f11d4..068c78588 100644
--- a/src/core/hle/service/sm/sm.h
+++ b/src/core/hle/service/sm/sm.h
@@ -49,6 +49,7 @@ private:
     ServiceManager& service_manager;
     bool is_initialized{};
     Kernel::KernelCore& kernel;
+    std::vector<Kernel::KServerPort*> server_ports;
 };
 
 class ServiceManager {
@@ -58,7 +59,8 @@ public:
     explicit ServiceManager(Kernel::KernelCore& kernel_);
     ~ServiceManager();
 
-    ResultVal<Kernel::KServerPort*> RegisterService(std::string name, u32 max_sessions);
+    ResultCode RegisterService(std::string name, u32 max_sessions,
+                               Kernel::SessionRequestHandlerPtr handler);
     ResultCode UnregisterService(const std::string& name);
     ResultVal<Kernel::KPort*> GetServicePort(const std::string& name);
 
@@ -69,21 +71,17 @@ public:
             LOG_DEBUG(Service, "Can't find service: {}", service_name);
             return nullptr;
         }
-        auto* port = service->second;
-        if (port == nullptr) {
-            return nullptr;
-        }
-        return std::static_pointer_cast<T>(port->GetServerPort().GetSessionRequestHandler());
+        return std::static_pointer_cast<T>(service->second);
     }
 
     void InvokeControlRequest(Kernel::HLERequestContext& context);
 
 private:
-    std::weak_ptr<SM> sm_interface;
+    std::shared_ptr<SM> sm_interface;
     std::unique_ptr<Controller> controller_interface;
 
     /// Map of registered services, retrieved using GetServicePort.
-    std::unordered_map<std::string, Kernel::KPort*> registered_services;
+    std::unordered_map<std::string, Kernel::SessionRequestHandlerPtr> registered_services;
 
     /// Kernel context
     Kernel::KernelCore& kernel;
diff --git a/src/video_core/buffer_cache/buffer_cache.h b/src/video_core/buffer_cache/buffer_cache.h
index 7373cb62d..5a0b6f0c0 100644
--- a/src/video_core/buffer_cache/buffer_cache.h
+++ b/src/video_core/buffer_cache/buffer_cache.h
@@ -553,13 +553,9 @@ bool BufferCache<P>::DMAClear(GPUVAddr dst_address, u64 amount, u32 value) {
     ClearDownload(subtract_interval);
     common_ranges.subtract(subtract_interval);
 
-    BufferId buffer;
-    do {
-        has_deleted_buffers = false;
-        buffer = FindBuffer(*cpu_dst_address, static_cast<u32>(size));
-    } while (has_deleted_buffers);
+    const BufferId buffer = FindBuffer(*cpu_dst_address, static_cast<u32>(size));
     auto& dest_buffer = slot_buffers[buffer];
-    const u32 offset = static_cast<u32>(*cpu_dst_address - dest_buffer.CpuAddr());
+    const u32 offset = dest_buffer.Offset(*cpu_dst_address);
     runtime.ClearBuffer(dest_buffer, offset, size, value);
     return true;
 }
diff --git a/src/video_core/renderer_opengl/gl_buffer_cache.cpp b/src/video_core/renderer_opengl/gl_buffer_cache.cpp
index c4189fb60..a02a45e04 100644
--- a/src/video_core/renderer_opengl/gl_buffer_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_buffer_cache.cpp
@@ -100,7 +100,7 @@ void BufferCacheRuntime::CopyBuffer(Buffer& dst_buffer, Buffer& src_buffer,
 
 void BufferCacheRuntime::ClearBuffer(Buffer& dest_buffer, u32 offset, size_t size, u32 value) {
     glClearNamedBufferSubData(dest_buffer.Handle(), GL_R32UI, static_cast<GLintptr>(offset),
-                              static_cast<GLsizeiptr>(size / sizeof(u32)), GL_RGBA, GL_UNSIGNED_INT,
+                              static_cast<GLsizeiptr>(size / sizeof(u32)), GL_RED, GL_UNSIGNED_INT,
                               &value);
 }