powerpc/pseries: Detect secure and trusted boot state of the system.
The device-tree properties to check secure and trusted boot state are different for guests (pseries) compared to baremetal (powernv). This patch updates the existing is_ppc_secureboot_enabled() and is_ppc_trustedboot_enabled() functions to add support for pseries. For pseries the secureboot and trustedboot state are exposed via device-tree properties /ibm,secure-boot and /ibm,trusted-boot. The values of ibm,secure-boot under pseries are interpreted as: 0 - Disabled 1 - Enabled in Log-only mode. This patch interprets this value as disabled, since audit mode is currently not supported for Linux. 2 - Enabled and enforced. 3-9 - Enabled and enforcing; requirements are at the discretion of the operating system. The values of ibm,trusted-boot under pseries are interpreted as: 0 - Disabled 1 - Enabled Signed-off-by:Nayna Jain <nayna@linux.ibm.com> Reviewed-by:
Daniel Axtens <dja@axtens.net> Reviewed-by:
Mimi Zohar <zohar@linux.ibm.com> [mpe: Drop machdep.h inclusion, tweak change log slightly] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1594813921-12425-1-git-send-email-nayna@linux.ibm.com
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