Merge branch 'topic/secureboot' into next

Merge the secureboot support, as well as the IMA changes needed to
support it.

From Nayna's cover letter:
  In order to verify the OS kernel on PowerNV systems, secure boot
  requires X.509 certificates trusted by the platform. These are
  stored in secure variables controlled by OPAL, called OPAL secure
  variables. In order to enable users to manage the keys, the secure
  variables need to be exposed to userspace.

  OPAL provides the runtime services for the kernel to be able to
  access the secure variables. This patchset defines the kernel
  interface for the OPAL APIs. These APIs are used by the hooks, which
  load these variables to the keyring and expose them to the userspace
  for reading/writing.

  Overall, this patchset adds the following support:
    * expose secure variables to the kernel via OPAL Runtime API interface
    * expose secure variables to the userspace via kernel sysfs interface
    * load kernel verification and revocation keys to .platform and
      .blacklist keyring respectively.

  The secure variables can be read/written using simple linux
  utilities cat/hexdump.

  For example:
  Path to the secure variables is: /sys/firmware/secvar/vars

    Each secure variable is listed as directory.
    $ ls -l
    total 0
    drwxr-xr-x. 2 root root 0 Aug 20 21:20 db
    drwxr-xr-x. 2 root root 0 Aug 20 21:20 KEK
    drwxr-xr-x. 2 root root 0 Aug 20 21:20 PK

  The attributes of each of the secure variables are (for example: PK):
    $ ls -l
    total 0
    -r--r--r--. 1 root root  4096 Oct  1 15:10 data
    -r--r--r--. 1 root root 65536 Oct  1 15:10 size
    --w-------. 1 root root  4096 Oct  1 15:12 update

  The "data" is used to read the existing variable value using
  hexdump. The data is stored in ESL format. The "update" is used to
  write a new value using cat. The update is to be submitted as AUTH
  file.

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 51a975c3d79b..b0bdfe31d12e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -952,6 +952,28 @@ config PPC_MEM_KEYS
 
 	  If unsure, say y.
 
+config PPC_SECURE_BOOT
+	prompt "Enable secure boot support"
+	bool
+	depends on PPC_POWERNV
+	depends on IMA_ARCH_POLICY
+	help
+	  Systems with firmware secure boot enabled need to define security
+	  policies to extend secure boot to the OS. This config allows a user
+	  to enable OS secure boot on systems that have firmware support for
+	  it. If in doubt say N.
+
+config PPC_SECVAR_SYSFS
+	bool "Enable sysfs interface for POWER secure variables"
+	default y
+	depends on PPC_SECURE_BOOT
+	depends on SYSFS
+	help
+	  POWER secure variables are managed and controlled by firmware.
+	  These variables are exposed to userspace via sysfs to enable
+	  read/write operations on these variables. Say Y if you have
+	  secure boot enabled and want to expose variables to userspace.
+
 endmenu
 
 config ISA_DMA_API