Kernel/Memory: Give each Process its own page table.

The loader is in charge of setting the newly created process's page table as the main one during the loading process.

2 files changed, 14 insertions, 5 deletions

diff --git a/src/core/hle/kernel/vm_manager.cpp b/src/core/hle/kernel/vm_manager.cpp
index cef1f7fa8..7a007c065 100644
--- a/src/core/hle/kernel/vm_manager.cpp
+++ b/src/core/hle/kernel/vm_manager.cpp
@@ -56,6 +56,10 @@ void VMManager::Reset() {
     initial_vma.size = MAX_ADDRESS;
     vma_map.emplace(initial_vma.base, initial_vma);
 
+    page_table.pointers.fill(nullptr);
+    page_table.attributes.fill(Memory::PageType::Unmapped);
+    page_table.cached_res_count.fill(0);
+
     UpdatePageTableForVMA(initial_vma);
 }
 
@@ -328,16 +332,17 @@ VMManager::VMAIter VMManager::MergeAdjacent(VMAIter iter) {
 void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
     switch (vma.type) {
     case VMAType::Free:
-        Memory::UnmapRegion(vma.base, vma.size);
+        Memory::UnmapRegion(page_table, vma.base, vma.size);
         break;
     case VMAType::AllocatedMemoryBlock:
-        Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_block->data() + vma.offset);
+        Memory::MapMemoryRegion(page_table, vma.base, vma.size,
+                                vma.backing_block->data() + vma.offset);
         break;
     case VMAType::BackingMemory:
-        Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_memory);
+        Memory::MapMemoryRegion(page_table, vma.base, vma.size, vma.backing_memory);
         break;
     case VMAType::MMIO:
-        Memory::MapIoRegion(vma.base, vma.size, vma.mmio_handler);
+        Memory::MapIoRegion(page_table, vma.base, vma.size, vma.mmio_handler);
         break;
     }
 }
diff --git a/src/core/hle/kernel/vm_manager.h b/src/core/hle/kernel/vm_manager.h
index 38e0d74d0..1302527bb 100644
--- a/src/core/hle/kernel/vm_manager.h
+++ b/src/core/hle/kernel/vm_manager.h
@@ -9,6 +9,7 @@
 #include <vector>
 #include "common/common_types.h"
 #include "core/hle/result.h"
+#include "core/memory.h"
 #include "core/mmio.h"
 
 namespace Kernel {
@@ -102,7 +103,6 @@ struct VirtualMemoryArea {
  *  - http://duartes.org/gustavo/blog/post/page-cache-the-affair-between-memory-and-files/
  */
 class VMManager final {
-    // TODO(yuriks): Make page tables switchable to support multiple VMManagers
 public:
     /**
      * The maximum amount of address space managed by the kernel. Addresses above this are never
@@ -184,6 +184,10 @@ public:
     /// Dumps the address space layout to the log, for debugging
     void LogLayout(Log::Level log_level) const;
 
+    /// Each VMManager has its own page table, which is set as the main one when the owning process
+    /// is scheduled.
+    Memory::PageTable page_table;
+
 private:
     using VMAIter = decltype(vma_map)::iterator;