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The boot physical address space fits in the first 512 GBs. The boot virtual address maps this to the high 512 GBs. In this way, the kernel module code will be loaded at the address it was linked for. Address spaces designed for 1 GB huge guest virtual pages. The hope is this address will be big enough for a lot of use cases, so the code inside the LCD won't ever need to touch the guest virtual address space (just physical).
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