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    Subject[PATCH v4 2/3] powerpc/powernv: detect the secure boot mode of the system
    Date
    PowerNV secure boot defines different IMA policies based on the secure
    boot state of the system.

    This patch defines a function to detect the secure boot state of the
    system.

    Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
    ---
    arch/powerpc/include/asm/secboot.h | 21 ++++++++
    arch/powerpc/platforms/powernv/Makefile | 2 +-
    arch/powerpc/platforms/powernv/secboot.c | 61 ++++++++++++++++++++++++
    3 files changed, 83 insertions(+), 1 deletion(-)
    create mode 100644 arch/powerpc/include/asm/secboot.h
    create mode 100644 arch/powerpc/platforms/powernv/secboot.c

    diff --git a/arch/powerpc/include/asm/secboot.h b/arch/powerpc/include/asm/secboot.h
    new file mode 100644
    index 000000000000..1904fb4a3352
    --- /dev/null
    +++ b/arch/powerpc/include/asm/secboot.h
    @@ -0,0 +1,21 @@
    +/* SPDX-License-Identifier: GPL-2.0 */
    +/*
    + * PowerPC secure boot definitions
    + *
    + * Copyright (C) 2019 IBM Corporation
    + * Author: Nayna Jain <nayna@linux.ibm.com>
    + *
    + */
    +#ifndef POWERPC_SECBOOT_H
    +#define POWERPC_SECBOOT_H
    +
    +#if defined(CONFIG_OPAL_SECVAR)
    +extern bool get_powerpc_sb_mode(void);
    +#else
    +static inline bool get_powerpc_sb_mode(void)
    +{
    + return false;
    +}
    +#endif
    +
    +#endif
    diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
    index 6651c742e530..6f4af607a915 100644
    --- a/arch/powerpc/platforms/powernv/Makefile
    +++ b/arch/powerpc/platforms/powernv/Makefile
    @@ -16,4 +16,4 @@ obj-$(CONFIG_PERF_EVENTS) += opal-imc.o
    obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o
    obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o vas-debug.o
    obj-$(CONFIG_OCXL_BASE) += ocxl.o
    -obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o
    +obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o secboot.o
    diff --git a/arch/powerpc/platforms/powernv/secboot.c b/arch/powerpc/platforms/powernv/secboot.c
    new file mode 100644
    index 000000000000..9199e520ebed
    --- /dev/null
    +++ b/arch/powerpc/platforms/powernv/secboot.c
    @@ -0,0 +1,61 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Copyright (C) 2019 IBM Corporation
    + * Author: Nayna Jain <nayna@linux.ibm.com>
    + *
    + * secboot.c
    + * - util function to get powerpc secboot state
    + */
    +#include <linux/uuid.h>
    +#include <asm/opal.h>
    +#include <asm/secboot.h>
    +#include <asm/opal-secvar.h>
    +
    +bool get_powerpc_sb_mode(void)
    +{
    + u8 secure_boot_name[] = "SecureBoot";
    + u8 setup_mode_name[] = "SetupMode";
    + u8 secboot, setupmode;
    + unsigned long size = sizeof(secboot);
    + int status;
    + unsigned long version;
    +
    + status = opal_variable_version(&version);
    + if ((status != OPAL_SUCCESS) || (version != BACKEND_TC_COMPAT_V1)) {
    + pr_info("secboot: error retrieving compatible backend\n");
    + return false;
    + }
    +
    + status = opal_get_variable(secure_boot_name, sizeof(secure_boot_name),
    + NULL, NULL, &secboot, &size);
    +
    + /*
    + * For now assume all failures reading the SecureBoot variable implies
    + * secure boot is not enabled. Later differentiate failure types.
    + */
    + if (status != OPAL_SUCCESS) {
    + secboot = 0;
    + setupmode = 0;
    + goto out;
    + }
    +
    + size = sizeof(setupmode);
    + status = opal_get_variable(setup_mode_name, sizeof(setup_mode_name),
    + NULL, NULL, &setupmode, &size);
    +
    + /*
    + * Failure to read the SetupMode variable does not prevent
    + * secure boot mode
    + */
    + if (status != OPAL_SUCCESS)
    + setupmode = 0;
    +
    +out:
    + if ((secboot == 0) || (setupmode == 1)) {
    + pr_info("secboot: secureboot mode disabled\n");
    + return false;
    + }
    +
    + pr_info("secboot: secureboot mode enabled\n");
    + return true;
    +}
    --
    2.20.1
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