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

From: Stefan Berger <stefanb@linux.ibm.com>
To: mpe@ellerman.id.au, linux-integrity@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org, jarkko@kernel.org,
	rnsastry@linux.ibm.com, peterhuewe@gmx.de, viparash@in.ibm.com,
	Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH 1/2] powerpc/prom_init: Replace linux,sml-base/sml-size with linux,sml-log
Date: Wed,  6 Mar 2024 10:55:10 -0500	[thread overview]
Message-ID: <20240306155511.974517-2-stefanb@linux.ibm.com> (raw)
In-Reply-To: <20240306155511.974517-1-stefanb@linux.ibm.com>

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@linux.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

