x86/sev: Move early startup code into .head.text section
In preparation for implementing rigorous build time checks to enforce that only code that can support it will be called from the early 1:1 mapping of memory, move SEV init code that is called in this manner to the .head.text section. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/20240227151907.387873-19-ardb+git@google.com
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