[VMA] Use Host cached and Host coherent for Download operations

Increase read speeds by using appropriate usage flags

src/common/host_memory.cpp

@@ -598,12 +598,17 @@ public:
 
     bool ClearBackingRegion(size_t physical_offset, size_t length) {
 #ifdef __linux__
-        // Set MADV_REMOVE on backing map to destroy it instantly.
-        // This also deletes the area from the backing file.
-        int ret = madvise(backing_base + physical_offset, length, MADV_REMOVE);
-        ASSERT_MSG(ret == 0, "madvise failed: {}", strerror(errno));
-
-        return true;
+        // Only incur syscall cost IF memset would be slower (theshold = 16MiB)
+        // TODO(lizzie): Smarter way to dynamically get this threshold (broadwell != raptor lake) for example
+        if (length >= 2097152UL * 8) {
+            // Set MADV_REMOVE on backing map to destroy it instantly.
+            // This also deletes the area from the backing file.
+            int ret = madvise(backing_base + physical_offset, length, MADV_REMOVE);
+            ASSERT_MSG(ret == 0, "madvise failed: {}", strerror(errno));
+            return true;
+        } else {
+            return false;
+        }
 #else
         return false;
 #endif

src/core/CMakeLists.txt

@@ -107,7 +107,6 @@ add_library(core STATIC
     file_sys/fssystem/fssystem_nca_header.cpp
     file_sys/fssystem/fssystem_nca_header.h
     file_sys/fssystem/fssystem_nca_reader.cpp
-    file_sys/fssystem/fssystem_passthrough_storage.h
     file_sys/fssystem/fssystem_pooled_buffer.cpp
     file_sys/fssystem/fssystem_pooled_buffer.h
     file_sys/fssystem/fssystem_sparse_storage.cpp

src/core/file_sys/fssystem/fssystem_bucket_tree.cpp

@@ -4,7 +4,6 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "common/settings.h"
 #include "core/file_sys/errors.h"
 #include "core/file_sys/fssystem/fssystem_bucket_tree.h"
 #include "core/file_sys/fssystem/fssystem_bucket_tree_utils.h"

src/core/file_sys/fssystem/fssystem_nca_file_system_driver.cpp

@@ -4,7 +4,6 @@
 // SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-#include "common/settings.h"
 #include "core/file_sys/fssystem/fssystem_aes_ctr_counter_extended_storage.h"
 #include "core/file_sys/fssystem/fssystem_aes_ctr_storage.h"
 #include "core/file_sys/fssystem/fssystem_aes_xts_storage.h"
@@ -14,7 +13,6 @@
 #include "core/file_sys/fssystem/fssystem_hierarchical_sha256_storage.h"
 #include "core/file_sys/fssystem/fssystem_indirect_storage.h"
 #include "core/file_sys/fssystem/fssystem_integrity_romfs_storage.h"
-#include "core/file_sys/fssystem/fssystem_passthrough_storage.h"
 #include "core/file_sys/fssystem/fssystem_memory_resource_buffer_hold_storage.h"
 #include "core/file_sys/fssystem/fssystem_nca_file_system_driver.h"
 #include "core/file_sys/fssystem/fssystem_sparse_storage.h"

src/core/file_sys/fssystem/fssystem_nca_header.cpp

@@ -13,13 +13,11 @@ u8 NcaHeader::GetProperKeyGeneration() const {
 }
 
 bool NcaPatchInfo::HasIndirectTable() const {
-    static constexpr unsigned char BKTR[4] = {'B', 'K', 'T', 'R'};
-    return std::memcmp(indirect_header.data(), BKTR, sizeof(BKTR)) == 0;
+    return this->indirect_size != 0;
 }
 
 bool NcaPatchInfo::HasAesCtrExTable() const {
-    static constexpr unsigned char BKTR[4] = {'B', 'K', 'T', 'R'};
-    return std::memcmp(aes_ctr_ex_header.data(), BKTR, sizeof(BKTR)) == 0;
+    return this->aes_ctr_ex_size != 0;
 }
 
 } // namespace FileSys

src/core/file_sys/fssystem/fssystem_passthrough_storage.h

@@ -1,32 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#pragma once
-#include "core/file_sys/fssystem/fs_i_storage.h"
-#include "core/file_sys/vfs/vfs.h"
-
-namespace FileSys {
-
-//TODO: No integrity verification.
-class PassthroughStorage final : public IReadOnlyStorage {
-    YUZU_NON_COPYABLE(PassthroughStorage);
-    YUZU_NON_MOVEABLE(PassthroughStorage);
-
-public:
-    explicit PassthroughStorage(VirtualFile base) : base_(std::move(base)) {}
-    ~PassthroughStorage() override = default;
-
-    size_t Read(u8* buffer, size_t size, size_t offset) const override {
-        if (!base_ || size == 0)
-            return 0;
-        return base_->Read(buffer, size, offset);
-    }
-    size_t GetSize() const override {
-        return base_ ? base_->GetSize() : 0;
-    }
-
-private:
-    VirtualFile base_{};
-};
-
-} // namespace FileSys