x86/sev-es: Compile early handler code into kernel image

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Setup sev-es.c and include the code from the pre-decompression stage
to also build it into the image of the running kernel. Temporarily add
__maybe_unused annotations to avoid build warnings until the functions
get used.

 [ bp: Use the non-tracing rd/wrmsr variants because:
   vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0x11f: \
	   call to do_trace_write_msr() leaves .noinstr.text section
   as __sev_es_nmi_complete() is noinstr due to being called from the
   NMI handler exc_nmi(). ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-39-joro@8bytes.org

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Joerg Roedel 2020-09-07 15:15:39 +02:00 • committed by Borislav Petkov

parent c685eb0c12

commit f980f9c31a

3 changed files with 175 additions and 10 deletions

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1

arch/x86/kernel/Makefile

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21

arch/x86/kernel/sev-es-shared.c

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163

arch/x86/kernel/sev-es.c

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