linux-kernel - [PATCH 1/2] powerpc/prom_init: Replace linux,sml-base/sml-size with linux,sml-log

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Date: Wed,  6 Mar 2024 10:55:10 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: mpe@...erman.id.au, linux-integrity@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org, jarkko@...nel.org, rnsastry@...ux.ibm.com,
        peterhuewe@....de, viparash@...ibm.com,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH 1/2] powerpc/prom_init: Replace linux,sml-base/sml-size with linux,sml-log

linux,sml-base holds the address of a buffer with the TPM log. This
buffer may become invalid after a kexec and therefore embed the whole TPM
log in linux,sml-log. This helps to protect the log since it is properly
carried across a kexec with both of the kexec syscalls.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
 arch/powerpc/kernel/prom_init.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index e67effdba85c..41268c30de4c 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1956,12 +1956,8 @@ static void __init prom_instantiate_sml(void)
 
 	reserve_mem(base, size);
 
-	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",
-		     &base, sizeof(base));
-	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",
-		     &size, sizeof(size));
-
-	prom_debug("sml base     = 0x%llx\n", base);
+	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-log",
+		     (void *)base, size);
 	prom_debug("sml size     = 0x%x\n", size);
 
 	prom_debug("prom_instantiate_sml: end...\n");
-- 
2.43.0