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Subject[PATCH v5 3/3] docs: kernel-parameters.txt: document rand_mem_physical_padding
Date
From: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>

This kernel parameter allows to change the padding used
for the physical memory mapping section when KASLR
memory is enabled.

For memory hotplug capable systems, the default padding size,
CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING, may not be enough.
The option is useful to adjust the padding size.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
---
.../admin-guide/kernel-parameters.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 92eb1f4..4c4c5e6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3529,6 +3529,24 @@
fully seed the kernel's CRNG. Default is controlled
by CONFIG_RANDOM_TRUST_CPU.

+ rand_mem_physical_padding=
+ [KNL] Define the padding size in terabytes
+ used for the physical memory mapping section
+ when KASLR is enabled.
+ If the padding size is not enough, you can see
+ 'Set rand_mem_physical_padding=XX ...' in system
+ boot message, so set the parameter as the message.
+
+ This parameter is useful for the memory hot-add capable
+ system. Such system may have more space than
+ actual memory size to hot-add memory. If the
+ padding size is not enough and a memory is hot-added,
+ the hot-adding will fail because it destroys the
+ system memory map. So, the padding size is needed to
+ adjust in such system.
+ The default value is
+ CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING.
+
ras=option[,option,...] [KNL] RAS-specific options

cec_disable [X86]
--
2.18.0
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