x86/sev-es: Setup GHCB-based boot #VC handler

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Add the infrastructure to handle #VC exceptions when the kernel runs on
virtual addresses and has mapped a GHCB. This handler will be used until
the runtime #VC handler takes over.

Since the handler runs very early, disable instrumentation for sev-es.c.

 [ bp: Make vc_ghcb_invalidate() __always_inline so that it can be
   inlined in noinstr functions like __sev_es_nmi_complete(). ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200908123816.GB3764@8bytes.org

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This commit is contained in:

Joerg Roedel 2020-09-08 14:38:16 +02:00 • committed by Borislav Petkov

parent 74d8d9d531

commit 1aa9aa8ee5

9 changed files with 176 additions and 8 deletions

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3

arch/x86/include/asm/realmode.h

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2

arch/x86/include/asm/segment.h

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2

arch/x86/include/asm/sev-es.h

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arch/x86/kernel/Makefile

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8

arch/x86/kernel/head64.c

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arch/x86/kernel/head_64.S

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

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arch/x86/kernel/sev-es.c

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1

arch/x86/mm/extable.c

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