VMManager: change MapMemoryBlockToBase to use raw backing memory

And let ServerSession.MappedBufferContext hold the mapped memory

src/core/hle/kernel/ipc.cpp

@@ -181,29 +181,31 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
             // TODO(Subv): Perform permission checks.
 
             // Reserve a page of memory before the mapped buffer
-            auto reserve_buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
-            dst_process->vm_manager.MapMemoryBlockToBase(
-                Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer, 0,
-                static_cast<u32>(reserve_buffer->size()), Kernel::MemoryState::Reserved);
+            auto reserve_buffer = std::make_unique<u8[]>(Memory::PAGE_SIZE);
+            dst_process->vm_manager.MapBackingMemoryToBase(
+                Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer.get(),
+                Memory::PAGE_SIZE, Kernel::MemoryState::Reserved);
 
-            auto buffer = std::make_shared<std::vector<u8>>(num_pages * Memory::PAGE_SIZE);
-            Memory::ReadBlock(*src_process, source_address, buffer->data() + page_offset, size);
+            auto buffer = std::make_unique<u8[]>(num_pages * Memory::PAGE_SIZE);
+            Memory::ReadBlock(*src_process, source_address, buffer.get() + page_offset, size);
 
             // Map the page(s) into the target process' address space.
-            target_address = dst_process->vm_manager
-                                 .MapMemoryBlockToBase(
-                                     Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, buffer, 0,
-                                     static_cast<u32>(buffer->size()), Kernel::MemoryState::Shared)
-                                 .Unwrap();
+            target_address =
+                dst_process->vm_manager
+                    .MapBackingMemoryToBase(Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE,
+                                            buffer.get(), num_pages * Memory::PAGE_SIZE,
+                                            Kernel::MemoryState::Shared)
+                    .Unwrap();
 
             cmd_buf[i++] = target_address + page_offset;
 
             // Reserve a page of memory after the mapped buffer
-            dst_process->vm_manager.MapMemoryBlockToBase(
-                Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer, 0,
-                static_cast<u32>(reserve_buffer->size()), Kernel::MemoryState::Reserved);
+            dst_process->vm_manager.MapBackingMemoryToBase(
+                Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer.get(),
+                Memory::PAGE_SIZE, Kernel::MemoryState::Reserved);
 
-            mapped_buffer_context.push_back({permissions, size, source_address, target_address});
+            mapped_buffer_context.push_back({permissions, size, source_address, target_address,
+                                             std::move(buffer), std::move(reserve_buffer)});
 
             break;
         }

src/core/hle/kernel/ipc.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <vector>
 #include "common/common_types.h"
 #include "core/hle/ipc.h"
@@ -16,6 +17,9 @@ struct MappedBufferContext {
     u32 size;
     VAddr source_address;
     VAddr target_address;
+
+    std::unique_ptr<u8[]> buffer;
+    std::unique_ptr<u8[]> reserve_buffer;
 };
 
 /// Performs IPC command buffer translation from one process to another.

src/core/hle/kernel/vm_manager.cpp

@@ -93,9 +93,8 @@ ResultVal<VMManager::VMAHandle> VMManager::MapMemoryBlock(VAddr target,
     return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
 }
 
-ResultVal<VAddr> VMManager::MapMemoryBlockToBase(VAddr base, u32 region_size,
-                                                 std::shared_ptr<std::vector<u8>> block,
-                                                 std::size_t offset, u32 size, MemoryState state) {
+ResultVal<VAddr> VMManager::MapBackingMemoryToBase(VAddr base, u32 region_size, u8* memory,
+                                                   u32 size, MemoryState state) {
 
     // Find the first Free VMA.
     VMAHandle vma_handle = std::find_if(vma_map.begin(), vma_map.end(), [&](const auto& vma) {
@@ -115,7 +114,7 @@ ResultVal<VAddr> VMManager::MapMemoryBlockToBase(VAddr base, u32 region_size,
                           ErrorSummary::OutOfResource, ErrorLevel::Permanent);
     }
 
-    auto result = MapMemoryBlock(target, block, offset, size, state);
+    auto result = MapBackingMemory(target, memory, size, state);
 
     if (result.Failed())
         return result.Code();

src/core/hle/kernel/vm_manager.h

@@ -150,15 +150,13 @@ public:
      *
      * @param base The base address to start the mapping at.
      * @param region_size The max size of the region from where we'll try to find an address.
-     * @param block The block to be mapped.
-     * @param offset Offset into `block` to map from.
+     * @param memory The memory to be mapped.
      * @param size Size of the mapping.
      * @param state MemoryState tag to attach to the VMA.
      * @returns The address at which the memory was mapped.
      */
-    ResultVal<VAddr> MapMemoryBlockToBase(VAddr base, u32 region_size,
-                                          std::shared_ptr<std::vector<u8>> block,
-                                          std::size_t offset, u32 size, MemoryState state);
+    ResultVal<VAddr> MapBackingMemoryToBase(VAddr base, u32 region_size, u8* memory, u32 size,
+                                            MemoryState state);
     /**
      * Maps an unmanaged host memory pointer at a given address.
      *