x86/sev-es: Handle NMI State

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When running under SEV-ES, the kernel has to tell the hypervisor when to
open the NMI window again after an NMI was injected. This is done with
an NMI-complete message to the hypervisor.

Add code to the kernel's NMI handler to send this message right at the
beginning of do_nmi(). This always allows nesting NMIs.

 [ bp: Mark __sev_es_nmi_complete() noinstr:
   vmlinux.o: warning: objtool: exc_nmi()+0x17: call to __sev_es_nmi_complete()
	leaves .noinstr.text section
   While at it, use __pa_nodebug() for the same reason due to
   CONFIG_DEBUG_VIRTUAL=y:
   vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0xd9: call to __phys_addr()
   	leaves .noinstr.text section ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-71-joro@8bytes.org

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This commit is contained in:

Joerg Roedel 2020-09-07 15:16:11 +02:00 • committed by Borislav Petkov

parent 094794f597

commit 4ca68e023b

4 changed files with 32 additions and 0 deletions

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7

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

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1

arch/x86/include/uapi/asm/svm.h

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6

arch/x86/kernel/nmi.c

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18

arch/x86/kernel/sev-es.c

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