Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

[mirror_ubuntu-bionic-kernel.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 5a2d5079139b050cf06f2a31b4965b8bdd17531a..6996b7727b85227a10f7404828756909afaee0fd 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2233,6 +2233,17 @@
                        memory contents and reserves bad memory
                        regions that are detected.
 
+       mem_encrypt=    [X86-64] AMD Secure Memory Encryption (SME) control
+                       Valid arguments: on, off
+                       Default (depends on kernel configuration option):
+                         on  (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y)
+                         off (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=n)
+                       mem_encrypt=on:         Activate SME
+                       mem_encrypt=off:        Do not activate SME
+
+                       Refer to Documentation/x86/amd-memory-encryption.txt
+                       for details on when memory encryption can be activated.
+
        mem_sleep_default=      [SUSPEND] Default system suspend mode:
                        s2idle  - Suspend-To-Idle
                        shallow - Power-On Suspend or equivalent (if supported)
@@ -2633,9 +2644,10 @@
                        In kernels built with CONFIG_NO_HZ_FULL=y, set
                        the specified list of CPUs whose tick will be stopped
                        whenever possible. The boot CPU will be forced outside
-                       the range to maintain the timekeeping.
-                       The CPUs in this range must also be included in the
-                       rcu_nocbs= set.
+                       the range to maintain the timekeeping.  Any CPUs
+                       in this list will have their RCU callbacks offloaded,
+                       just as if they had also been called out in the
+                       rcu_nocbs= boot parameter.
 
        noiotrap        [SH] Disables trapped I/O port accesses.
 
@@ -2696,6 +2708,8 @@
        nopat           [X86] Disable PAT (page attribute table extension of
                        pagetables) support.
 
+       nopcid          [X86-64] Disable the PCID cpu feature.
+
        norandmaps      Don't use address space randomization.  Equivalent to
                        echo 0 > /proc/sys/kernel/randomize_va_space
 
@@ -3598,6 +3612,12 @@
                        Run specified binary instead of /init from the ramdisk,
                        used for early userspace startup. See initrd.
 
+       rdt=            [HW,X86,RDT]
+                       Turn on/off individual RDT features. List is:
+                       cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, mba.
+                       E.g. to turn on cmt and turn off mba use:
+                               rdt=cmt,!mba
+
        reboot=         [KNL]
                        Format (x86 or x86_64):
                                [w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \