diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
-rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 59 |
1 files changed, 42 insertions, 17 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index a1068742a6df..d246ad46d845 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -577,7 +577,7 @@ loops can be debugged more effectively on production systems. - clearcpuid=BITNUM [X86] + clearcpuid=BITNUM[,BITNUM...] [X86] Disable CPUID feature X for the kernel. See arch/x86/include/asm/cpufeatures.h for the valid bit numbers. Note the Linux specific bits are not necessarily @@ -591,13 +591,24 @@ some critical bits. cma=nn[MG]@[start[MG][-end[MG]]] - [ARM,X86,KNL] + [KNL,CMA] Sets the size of kernel global memory area for contiguous memory allocations and optionally the placement constraint by the physical address range of memory allocations. A value of 0 disables CMA altogether. For more information, see - include/linux/dma-contiguous.h + kernel/dma/contiguous.c + + cma_pernuma=nn[MG] + [ARM64,KNL] + Sets the size of kernel per-numa memory area for + contiguous memory allocations. A value of 0 disables + per-numa CMA altogether. And If this option is not + specificed, the default value is 0. + With per-numa CMA enabled, DMA users on node nid will + first try to allocate buffer from the pernuma area + which is located in node nid, if the allocation fails, + they will fallback to the global default memory area. cmo_free_hint= [PPC] Format: { yes | no } Specify whether pages are marked as being inactive @@ -940,7 +951,7 @@ Arch Perfmon v4 (Skylake and newer). disable_ddw [PPC/PSERIES] - Disable Dynamic DMA Window support. Use this if + Disable Dynamic DMA Window support. Use this to workaround buggy firmware. disable_ipv6= [IPV6] @@ -1019,7 +1030,7 @@ what data is available or for reverse-engineering. dyndbg[="val"] [KNL,DYNAMIC_DEBUG] - module.dyndbg[="val"] + <module>.dyndbg[="val"] Enable debug messages at boot time. See Documentation/admin-guide/dynamic-debug-howto.rst for details. @@ -1027,7 +1038,7 @@ nopku [X86] Disable Memory Protection Keys CPU feature found in some Intel CPUs. - module.async_probe [KNL] + <module>.async_probe [KNL] Enable asynchronous probe on this module. early_ioremap_debug [KNL] @@ -1332,12 +1343,18 @@ current integrity status. failslab= + fail_usercopy= fail_page_alloc= fail_make_request=[KNL] General fault injection mechanism. Format: <interval>,<probability>,<space>,<times> See also Documentation/fault-injection/. + fb_tunnels= [NET] + Format: { initns | none } + See Documentation/admin-guide/sysctl/net.rst for + fb_tunnels_only_for_init_ns + floppy= [HW] See Documentation/admin-guide/blockdev/floppy.rst. @@ -1956,7 +1973,7 @@ 1 - Bypass the IOMMU for DMA. unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH. - io7= [HW] IO7 for Marvel based alpha systems + io7= [HW] IO7 for Marvel-based Alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c. @@ -2177,7 +2194,7 @@ kgdbwait [KGDB] Stop kernel execution and enter the kernel debugger at the earliest opportunity. - kmac= [MIPS] korina ethernet MAC address. + kmac= [MIPS] Korina ethernet MAC address. Configure the RouterBoard 532 series on-chip Ethernet adapter MAC address. @@ -2258,6 +2275,14 @@ [KVM,ARM] Allow use of GICv4 for direct injection of LPIs. + kvm_cma_resv_ratio=n [PPC] + Reserves given percentage from system memory area for + contiguous memory allocation for KVM hash pagetable + allocation. + By default it reserves 5% of total system memory. + Format: <integer> + Default: 5 + kvm-intel.ept= [KVM,Intel] Disable extended page tables (virtualized MMU) support on capable Intel chips. Default is 1 (enabled) @@ -2367,9 +2392,10 @@ lapic [X86-32,APIC] Enable the local APIC even if BIOS disabled it. - lapic= [X86,APIC] "notscdeadline" Do not use TSC deadline + lapic= [X86,APIC] Do not use TSC deadline value for LAPIC timer one-shot implementation. Default back to the programmable timer unit in the LAPIC. + Format: notscdeadline lapic_timer_c2_ok [X86,APIC] trust the local apic timer in C2 power state. @@ -2441,8 +2467,7 @@ memblock=debug [KNL] Enable memblock debug messages. - load_ramdisk= [RAM] List of ramdisks to load from floppy - See Documentation/admin-guide/blockdev/ramdisk.rst. + load_ramdisk= [RAM] [Deprecated] lockd.nlm_grace_period=P [NFS] Assign grace period. Format: <integer> @@ -2579,8 +2604,8 @@ (machvec) in a generic kernel. Example: machvec=hpzx1 - machtype= [Loongson] Share the same kernel image file between different - yeeloong laptop. + machtype= [Loongson] Share the same kernel image file between + different yeeloong laptops. Example: machtype=lemote-yeeloong-2f-7inch max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater @@ -3185,7 +3210,7 @@ register save and restore. The kernel will only save legacy floating-point registers on task switch. - nohugeiomap [KNL,X86,PPC] Disable kernel huge I/O mappings. + nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings. nosmt [KNL,S390] Disable symmetric multithreading (SMT). Equivalent to smt=1. @@ -3921,9 +3946,7 @@ Param: <number> - step/bucket size as a power of 2 for statistical time based profiling. - prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk - before loading. - See Documentation/admin-guide/blockdev/ramdisk.rst. + prompt_ramdisk= [RAM] [Deprecated] prot_virt= [S390] enable hosting protected virtual machines isolated from the hypervisor (if hardware supports @@ -3981,6 +4004,8 @@ ramdisk_size= [RAM] Sizes of RAM disks in kilobytes See Documentation/admin-guide/blockdev/ramdisk.rst. + ramdisk_start= [RAM] RAM disk image start address + random.trust_cpu={on,off} [KNL] Enable or disable trusting the use of the CPU's random number generator (if available) to |