[PATCH v2 7/7] mm: secretmem: add ability to reserve memory at boot

From: Mike Rapoport
Date: Mon Jul 27 2020 - 12:30:50 EST

From: Mike Rapoport <rppt@xxxxxxxxxxxxx>

Taking pages out from the direct map and bringing them back may create
undesired fragmentation and usage of the smaller pages in the direct
mapping of the physical memory.

This can be avoided if a significantly large area of the physical memory
would be reserved for secretmem purposes at boot time.

Add ability to reserve physical memory for secretmem at boot time using
"secretmem" kernel parameter and then use that reserved memory as a global
pool for secret memory needs.

Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Documentation/admin-guide/kernel-parameters.txt | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index fb95fad81c79..6f3c2f28160f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4548,6 +4548,10 @@
Format: integer between 0 and 10
Default is 0.

+ secretmem=n[KMG]
+ [KNL,BOOT] Reserve specified amount of memory to
+ back mappings of secret memory.
skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate
xtime_lock contention on larger systems, and/or RCU lock
contention on all systems with CONFIG_MAXSMP set.