x86/sev-es: Adjust #VC IST Stack on entering NMI handler

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When an NMI hits in the #VC handler entry code before it has switched to
another stack, any subsequent #VC exception in the NMI code-path will
overwrite the interrupted #VC handler's stack.

Make sure this doesn't happen by explicitly adjusting the #VC IST entry
in the NMI handler for the time it can cause #VC exceptions.

 [ bp: Touchups, spelling fixes. ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-44-joro@8bytes.org

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Joerg Roedel 2020-09-07 15:15:44 +02:00 • committed by Borislav Petkov

parent 02772fb9b6

commit 315562c9af

3 changed files with 81 additions and 0 deletions

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19

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

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9

arch/x86/kernel/nmi.c

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53

arch/x86/kernel/sev-es.c

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