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x86/sev-es: Add SEV-ES Feature Detection
authorJoerg Roedel <jroedel@suse.de>
Mon, 7 Sep 2020 13:15:37 +0000 (15:15 +0200)
committerBorislav Petkov <bp@suse.de>
Mon, 7 Sep 2020 21:00:20 +0000 (23:00 +0200)
commitb57de6cd16395be1ebdaa9b489ffbf462bb585c4
tree24169b5dddc82ac87771fec6d1b9f6818fc92879tree
parent4b47cdbda6f1ad73b08dc7d497bac12b8f26ae0dcommit | diff
x86/sev-es: Add SEV-ES Feature Detection

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
arch/x86/include/asm/mem_encrypt.h diff | blob | history
arch/x86/include/asm/msr-index.h diff | blob | history
arch/x86/mm/mem_encrypt.c diff | blob | history
arch/x86/mm/mem_encrypt_identity.c diff | blob | history
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