From: Stefan Berger <stefanb@linux.ibm.com>
To: mpe@ellerman.id.au, linux-integrity@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org
Cc: rnsastry@linux.ibm.com, linux-kernel@vger.kernel.org,
jarkko@kernel.org, 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
next prev parent reply other threads:[~2024-03-06 15:56 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 15:55 [PATCH 0/2] Preserve TPM log across kexec Stefan Berger
2024-03-06 15:55 ` Stefan Berger [this message]
2024-03-07 10:41 ` [PATCH 1/2] powerpc/prom_init: Replace linux,sml-base/sml-size with linux,sml-log Michael Ellerman
2024-03-07 15:11 ` Stefan Berger
2024-03-07 20:39 ` Conor Dooley
2024-03-07 21:15 ` Stefan Berger
2024-03-07 21:29 ` Conor Dooley
2024-03-07 21:52 ` Rob Herring
2024-03-08 12:23 ` Stefan Berger
2024-03-08 20:57 ` Rob Herring
2024-03-08 21:26 ` Stefan Berger
2024-03-12 10:32 ` Michael Ellerman
2024-03-12 16:22 ` Rob Herring
2024-03-12 19:15 ` Stefan Berger
2024-03-07 20:11 ` Jarkko Sakkinen
2024-03-06 15:55 ` [PATCH 2/2] tpm: of: If available Use linux,sml-log to get the log and its size Stefan Berger
2024-03-07 10:42 ` Michael Ellerman
2024-03-07 15:00 ` Stefan Berger
2024-03-07 11:35 ` Conor Dooley
2024-03-07 19:57 ` Jarkko Sakkinen
2024-03-07 20:00 ` Jarkko Sakkinen
2024-03-08 12:17 ` Stefan Berger
2024-03-11 20:09 ` Jarkko Sakkinen
2024-03-12 10:35 ` Michael Ellerman
2024-03-12 15:50 ` Jarkko Sakkinen
2024-03-12 19:08 ` Stefan Berger
2024-03-06 16:08 ` [PATCH 0/2] Preserve TPM log across kexec Stefan Berger
2024-03-07 21:42 ` Rob Herring
2024-03-07 22:32 ` Stefan Berger
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