Kernel/HLE: Use a mutex to synchronize access to the HLE kernel state between the cpu thread and any other possible threads that might touch the kernel (network thread, etc).

This mutex is acquired in SVC::CallSVC, ie, as soon as the guest application enters the HLE kernel, and should be acquired by the aforementioned threads before modifying kernel structures.

src/core/hle/svc.cpp

@@ -31,6 +31,7 @@
 #include "core/hle/kernel/timer.h"
 #include "core/hle/kernel/vm_manager.h"
 #include "core/hle/kernel/wait_object.h"
+#include "core/hle/lock.h"
 #include "core/hle/result.h"
 #include "core/hle/service/service.h"
 
@@ -1188,7 +1189,7 @@ struct FunctionDef {
     Func* func;
     const char* name;
 };
-}
+} // namespace
 
 static const FunctionDef SVC_Table[] = {
     {0x00, nullptr, "Unknown"},
@@ -1332,6 +1333,9 @@ MICROPROFILE_DEFINE(Kernel_SVC, "Kernel", "SVC", MP_RGB(70, 200, 70));
 void CallSVC(u32 immediate) {
     MICROPROFILE_SCOPE(Kernel_SVC);
 
+    // Lock the global kernel mutex when we enter the kernel HLE.
+    std::lock_guard<std::mutex> lock(HLE::g_hle_lock);
+
     const FunctionDef* info = GetSVCInfo(immediate);
     if (info) {
         if (info->func) {
@@ -1342,4 +1346,4 @@ void CallSVC(u32 immediate) {
     }
 }
 
-} // namespace
+} // namespace SVC