diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 63 |
1 files changed, 56 insertions, 7 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fd03e2b629bb..52e6fbb042cc 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1588,7 +1588,7 @@ Format: { "off" | "enforce" | "fix" | "log" } default: "enforce" - ima_appraise_tcb [IMA] + ima_appraise_tcb [IMA] Deprecated. Use ima_policy= instead. The builtin appraise policy appraises all files owned by uid=0. @@ -1615,8 +1615,7 @@ uid=0. The "appraise_tcb" policy appraises the integrity of - all files owned by root. (This is the equivalent - of ima_appraise_tcb.) + all files owned by root. The "secure_boot" policy appraises the integrity of files (eg. kexec kernel image, kernel modules, @@ -1831,6 +1830,9 @@ ip= [IP_PNP] See Documentation/filesystems/nfs/nfsroot.txt. + ipcmni_extend [KNL] Extend the maximum number of unique System V + IPC identifiers from 32,768 to 16,777,216. + irqaffinity= [SMP] Set the default irq affinity mask The argument is a cpu list, as described above. @@ -2144,7 +2146,7 @@ Default is 'flush'. - For details see: Documentation/admin-guide/l1tf.rst + For details see: Documentation/admin-guide/hw-vuln/l1tf.rst l2cr= [PPC] @@ -2390,6 +2392,32 @@ Format: <first>,<last> Specifies range of consoles to be captured by the MDA. + mds= [X86,INTEL] + Control mitigation for the Micro-architectural Data + Sampling (MDS) vulnerability. + + Certain CPUs are vulnerable to an exploit against CPU + internal buffers which can forward information to a + disclosure gadget under certain conditions. + + In vulnerable processors, the speculatively + forwarded data can be used in a cache side channel + attack, to access data to which the attacker does + not have direct access. + + This parameter controls the MDS mitigation. The + options are: + + full - Enable MDS mitigation on vulnerable CPUs + full,nosmt - Enable MDS mitigation and disable + SMT on vulnerable CPUs + off - Unconditionally disable MDS mitigation + + Not specifying this option is equivalent to + mds=full. + + For details see: Documentation/admin-guide/hw-vuln/mds.rst + mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory Amount of memory to be used when the kernel is not able to see the whole system memory or for test. @@ -2566,6 +2594,7 @@ spec_store_bypass_disable=off [X86,PPC] ssbd=force-off [ARM64] l1tf=off [X86] + mds=off [X86] auto (default) Mitigate all CPU vulnerabilities, but leave SMT @@ -2580,6 +2609,7 @@ if needed. This is for users who always want to be fully mitigated, even if it means losing SMT. Equivalent to: l1tf=flush,nosmt [X86] + mds=full,nosmt [X86] mminit_loglevel= [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this @@ -2876,11 +2906,11 @@ noexec=on: enable non-executable mappings (default) noexec=off: disable non-executable mappings - nosmap [X86] + nosmap [X86,PPC] Disable SMAP (Supervisor Mode Access Prevention) even if it is supported by processor. - nosmep [X86] + nosmep [X86,PPC] Disable SMEP (Supervisor Mode Execution Prevention) even if it is supported by processor. @@ -3147,6 +3177,16 @@ This will also cause panics on machine check exceptions. Useful together with panic=30 to trigger a reboot. + page_alloc.shuffle= + [KNL] Boolean flag to control whether the page allocator + should randomize its free lists. The randomization may + be automatically enabled if the kernel detects it is + running on a platform with a direct-mapped memory-side + cache, and this parameter can be used to + override/disable that behavior. The state of the flag + can be read from sysfs at: + /sys/module/page_alloc/parameters/shuffle. + page_owner= [KNL] Boot-time page_owner enabling option. Storage of the information about who allocated each page is disabled in default. With this switch, @@ -4027,7 +4067,9 @@ [[,]s[mp]#### \ [[,]b[ios] | a[cpi] | k[bd] | t[riple] | e[fi] | p[ci]] \ [[,]f[orce] - Where reboot_mode is one of warm (soft) or cold (hard) or gpio, + Where reboot_mode is one of warm (soft) or cold (hard) or gpio + (prefix with 'panic_' to set mode for panic + reboot only), reboot_type is one of bios, acpi, kbd, triple, efi, or pci, reboot_force is either force or not specified, reboot_cpu is s[mp]#### with #### being the processor @@ -5218,6 +5260,13 @@ with /sys/devices/system/xen_memory/xen_memory0/scrub_pages. Default value controlled with CONFIG_XEN_SCRUB_PAGES_DEFAULT. + xen_timer_slop= [X86-64,XEN] + Set the timer slop (in nanoseconds) for the virtual Xen + timers (default is 100000). This adjusts the minimum + delta of virtualized Xen timers, where lower values + improve timer resolution at the expense of processing + more timer interrupts. + xirc2ps_cs= [NET,PCMCIA] Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |