linux-kernel - [PATCH v2] powerpc/pseries: detect secure and trusted boot state of the system.

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Date:   Fri, 10 Jul 2020 22:25:29 -0400
From:   Nayna Jain <nayna@...ux.ibm.com>
To:     linuxppc-dev@...abs.org
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Mimi Zohar <zohar@...ux.ibm.com>, linux-kernel@...r.kernel.org,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: [PATCH v2] powerpc/pseries: detect secure and trusted boot state of the system.

The device-tree property to check secure and trusted boot state is
different for guests(pseries) compared to baremetal(powernv).

This patch updates the existing is_ppc_secureboot_enabled() and
is_ppc_trustedboot_enabled() function to add support for pseries.

Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>
Reviewed-by: Daniel Axtens <dja@...ens.net>
---
v2:
* included Michael Ellerman's feedback.
* added Daniel Axtens's Reviewed-by.

 arch/powerpc/kernel/secure_boot.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
index 4b982324d368..efb325cbd42f 100644
--- a/arch/powerpc/kernel/secure_boot.c
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 #include <linux/of.h>
 #include <asm/secure_boot.h>
+#include <asm/machdep.h>
 
 static struct device_node *get_ppc_fw_sb_node(void)
 {
@@ -23,12 +24,21 @@ bool is_ppc_secureboot_enabled(void)
 {
 	struct device_node *node;
 	bool enabled = false;
+	u32 secureboot;
 
 	node = get_ppc_fw_sb_node();
 	enabled = of_property_read_bool(node, "os-secureboot-enforcing");
-
 	of_node_put(node);
 
+	if (enabled)
+		goto out;
+
+	if (!of_property_read_u32(of_root, "ibm,secure-boot", &secureboot)) {
+		if (secureboot)
+			enabled = (secureboot > 1) ? true : false;
+	}
+
+out:
 	pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
 
 	return enabled;
@@ -38,12 +48,21 @@ bool is_ppc_trustedboot_enabled(void)
 {
 	struct device_node *node;
 	bool enabled = false;
+	u32 trustedboot;
 
 	node = get_ppc_fw_sb_node();
 	enabled = of_property_read_bool(node, "trusted-enabled");
-
 	of_node_put(node);
 
+	if (enabled)
+		goto out;
+
+	if (!of_property_read_u32(of_root, "ibm,trusted-boot", &trustedboot)) {
+		if (trustedboot)
+			enabled = (trustedboot > 0) ? true : false;
+	}
+
+out:
 	pr_info("Trusted boot mode %s\n", enabled ? "enabled" : "disabled");
 
 	return enabled;
-- 
2.26.2