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Use managarm special fastmem fallback

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lizzie
2026-05-20 19:29:21 +00:00
parent 858f9e5aea
commit caf0c82a99
2 changed files with 17 additions and 2 deletions
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src/common/host_memory.cpp
+15 -2
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@@ -695,10 +695,21 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
backing_base = fallback_buffer->data();
virtual_base = nullptr;
#else
bool has_memfd = true; // all platforms support it
#ifdef _WIN32
// EXCEPT WINDOWS who may not (Windows 8.1, 7, Vista, etc)
DynamicLibrary kernelbase_dll("KernelBase");
has_memfd = kernelbase_dll.IsOpen();
if (has_memfd) {
PFN_CreateFileMapping2 p{};
GetFuncAddress(kernelbase_dll, "CreateFileMapping2", p);
has_memfd = p != nullptr;
}
#endif
// Try to allocate a fastmem arena.
// The implementation will fail with std::bad_alloc on errors.
impl = std::make_unique<HostMemory::Impl>(AlignUp(backing_size, PageAlignment), AlignUp(virtual_size, PageAlignment) + HugePageSize);
if (impl->Init()) {
if (has_memfd && impl->Init()) {
backing_base = impl->backing_base;
virtual_base = impl->virtual_base;
if (virtual_base) {
@@ -708,10 +719,12 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
}
} else {
impl.reset();
LOG_WARNING(HW_Memory, "Platform can support fastmem, but can't create it");
LOG_WARNING(HW_Memory, "Platform doesn't support fastmem");
#ifdef _WIN32
fallback_buffer.emplace(backing_size);
backing_base = fallback_buffer->data();
virtual_base = nullptr;
#endif
}
#endif
}