x86/sev-es: Add SEV-ES Feature Detection

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Add a sev_es_active() function for checking whether SEV-ES is enabled.
Also cache the value of MSR_AMD64_SEV at boot to speed up the feature
checking in the running code.

 [ bp: Remove "!!" in sev_active() too. ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200907131613.12703-37-joro@8bytes.org

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Joerg Roedel 2020-09-07 15:15:37 +02:00 • committed by Borislav Petkov

parent 4b47cdbda6

commit b57de6cd16

4 changed files with 16 additions and 1 deletions

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3

arch/x86/include/asm/mem_encrypt.h

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2

arch/x86/include/asm/msr-index.h

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9

arch/x86/mm/mem_encrypt.c

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3

arch/x86/mm/mem_encrypt_identity.c

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