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For correctness, when the CPUID supports the LA57 feature, the VMM sets the CR4.LA57 register, which means a fifth level of page table might be needed. Even if it's not needed because the kernel should not use addresses over 1GiB, it's better to define this new level anyway. This patch only applies to the Linux boot codepath, which means it affects both vmlinux without PVH and bzImage binaries. The bzImage does not need this since the page tables and CR4 registers are set in the decompression code from the kernel. And for vmlinux with PVH, if we follow the PVH specification, the kernel must be responsible for setting things up, but the implementation is missing. This means for now that PVH does not support LA57 with 5 levels of paging. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> |
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Cargo.toml |