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

Stefan Berger
2024-03-06T15:55:33Z

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