Lines Matching +full:peer +full:- +full:hub
38 Documentation/arch/m68k/kernel-options.rst.
48 PARISC The PA-RISC architecture is enabled.
63 the Documentation/scsi/ sub-directory.
83 X86-32 X86-32, aka i386 architecture is enabled.
84 X86-64 X86-64 architecture is enabled.
85 X86 Either 32-bit or 64-bit x86 (same as X86-32+X86-64)
94 KNL Is a kernel start-up parameter.
114 force -- enable ACPI if default was off
115 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
116 off -- disable ACPI if default was on
117 noirq -- do not use ACPI for IRQ routing
118 strict -- Be less tolerant of platforms that are not
120 rsdt -- prefer RSDT over (default) XSDT
121 copy_dsdt -- copy DSDT to memory
122 nocmcff -- Disable firmware first mode for corrected
126 nospcr -- disable console in ACPI SPCR table as
128 spcr -- enable console in ACPI SPCR table as
145 If set to vendor, prefer vendor-specific driver
177 Documentation/firmware-guide/acpi/debug.rst for more information about
243 Format: <byte> or <bitmap-list>
246 Disable auto-serialization of AML methods
249 auto-serialization feature.
267 Ignore the ACPI-based watchdog interface (WDAT) and let
288 acpi_osi=! # disable all built-in OS vendor
290 acpi_osi=!! # enable all built-in OS vendor
352 For broken nForce2 BIOS resulting in XT-PIC timer.
361 as soon as the kernel's real-mode entry point is called.
399 See Documentation/sound/alsa-configuration.rst
406 align_va_addr= [X86-64]
411 CPU-intensive style benchmark, and it can vary highly in
414 32: only for 32-bit processes
415 64: only for 64-bit processes
416 on: enable for both 32- and 64-bit processes
417 off: disable for both 32- and 64-bit processes
427 Allow execve() of 32-bit applications and setting of the
429 subset of the CPUs support 32-bit EL0. When this
430 parameter is present, the set of CPUs supporting 32-bit
432 and hot-unplug operations may be restricted.
434 See Documentation/arch/arm64/asymmetric-32bit.rst for more
437 amd_iommu= [HW,X86-64]
440 fullflush - Deprecated, equivalent to iommu.strict=1
441 off - do not initialize any AMD IOMMU found in
443 force_isolation - Force device isolation for all
448 force_enable - Force enable the IOMMU on platforms known
451 pgtbl_v1 - Use v1 page table for DMA-API (Default).
452 pgtbl_v2 - Use v2 page table for DMA-API.
453 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
454 nohugepages - Limit page-sizes used for v1 page-tables
456 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
460 amd_iommu_dump= [HW,X86-64]
466 amd_iommu_intr= [HW,X86-64]
469 legacy - Use legacy interrupt remapping mode.
470 vapic - Use virtual APIC mode, which allows IOMMU
472 This mode requires kvm-amd.avic=1.
501 Disable amd-pstate preferred core.
506 Disable amd-pstate dynamic EPP.
508 Enable amd-pstate dynamic EPP.
521 Power management functions (SPARCstation-4/5 + deriv.)
523 Disable APC CPU standby support. SPARCstation-Fox does
524 not play well with APC CPU idle - disable it if you have
527 apic [APIC,X86-64] Use IO-APIC. Default.
533 when initialising the APIC and IO-APIC components.
557 0 -- disable.
558 1 -- enable.
561 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
612 audit= [KNL] Enable the audit sub-system
614 0 | off - kernel audit is disabled and can not be
616 unset - kernel audit is initialized but disabled and
618 1 | on - kernel audit is initialized and partially
631 0 - Disable the BAU.
632 1 - Enable the BAU.
633 unset - Disable the BAU.
655 See Documentation/block/cmdline-partition.rst
669 See Documentation/admin-guide/bootconfig.rst
674 bttv.pll= See Documentation/admin-guide/media/bttv.rst
683 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
702 inclusive. See arch/mips/include/asm/pgtable-bits.h
709 cfi= [X86-64] Set Control Flow Integrity checking features
720 norand: Do not re-randomize CFI hashes.
730 - foo isn't auto-mounted if you mount all cgroups in
732 - foo isn't visible as an individually mountable
734 - if foo is an optional feature then the feature is
740 Specifying "pressure" disables per-cgroup pressure
757 semi-legacy software can check this file to decide
766 nosocket -- Disable socket memory accounting.
767 nokmem -- Disable kernel memory accounting.
768 nobpf -- Disable BPF memory accounting.
772 double-frees, use-after-frees, and other sources of
781 0 -- check protection applied by kernel (includes
783 1 -- check protection requested by application.
798 force such clocks to be always-on nor does it reserve
802 information, see Documentation/driver-api/clk.rst.
804 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
821 [X86-32] pit,hpet,tsc;
828 [X86-64] hpet,tsc
834 architected timer so that code using WFE-based polling
848 clocksource-wdtest.holdoff= [KNL]
854 cma=nn[MG]@[start[MG][-end[MG]]]
865 Sets the size of kernel per-numa memory area for
867 per-numa CMA altogether. And If this option is not
869 With per-numa CMA enabled, DMA users on node nid will
896 com20020= [HW,NET] ARCnet - COM20020 chipset
900 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
904 ARCnet - COM90xx chipset (memory-mapped buffers)
933 See Documentation/admin-guide/serial-console.rst for more
948 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
949 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
962 Start an early, polled-mode console on the 8250/16550
965 MMIO inter-register address stride is either 8-bit
966 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
970 the h/w is not re-initialized.
997 syscall, or to executing "dmesg -S --raw" or to reading
1021 disable the cpuidle sub-system
1027 disable the cpufreq sub-system
1035 [X86,EARLY] Delay for N microsec between assert and de-assert
1056 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
1064 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
1067 See Documentation/admin-guide/kdump/kdump.rst for further details.
1072 start-[end] where start and end are both
1074 Documentation/admin-guide/kdump/kdump.rst for an example.
1077 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
1085 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
1091 for 32-bit devices won't run out. Kernel would try to allocate
1094 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
1095 --> arm64: 128MiB
1096 --> riscv: 128MiB
1097 --> loongarch: 128MiB
1127 [KNL] Disable crypto self-tests
1135 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1150 See also Documentation/input/devices/joystick-parport.rst
1163 [KNL] verbose locking self-tests
1166 self-tests.
1168 (no extra messages), setting it to -1 (all bits set)
1169 will print _a_lot_ more information - normally only
1207 get a -EPERM as result when trying to register files
1211 Default value is set in build-time with a kernel configuration.
1223 Documentation/admin-guide/mm/hugetlbpage.rst.
1237 delayacct [KNL] Enable per-task delay accounting
1323 entries for DMA-API debugging code. One entry is
1324 required per DMA-API allocation. Use this if the
1325 DMA-API debugging code disables itself because the
1329 With this option the DMA-API debugging driver
1353 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1356 [KNL] When set to 1, leave the dm-verity keyring
1385 Control how the dt_cpu_ftrs device-tree binding is
1395 what data is available or for reverse-engineering.
1400 Documentation/admin-guide/dynamic-debug-howto.rst
1411 determined by stdout-path property in device tree's
1416 Start an early, polled-mode console on a Cadence
1427 Start an early, polled-mode console on the 8250/16550
1429 MMIO inter-register address stride is either 8-bit
1430 (mmio) or 32-bit (mmio32 or mmio32be).
1440 Start an early, polled-mode console on a pl011 serial
1444 the driver will use only 32-bit accessors to read/write
1453 Start an early, polled-mode console on a meson serial
1459 Start an early, polled-mode console on an msm serial
1465 Start an early, polled-mode console on an msm serial
1471 Start an early, polled-mode console on a serial port
1477 Start an early, polled-mode console on a serial port
1483 Use RISC-V SBI (Supervisor Binary Interface) for early
1501 Start an early, polled-mode console on a lantiq serial
1515 Start an early, polled-mode, output-only console on the
1520 Start an early, polled-mode console on the
1526 Start an early, polled-mode console on a Qualcomm
1534 coherent non-x86 systems that use system memory for
1637 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1654 elanfreq= [X86-32]
1662 See Documentation/admin-guide/kdump/kdump.rst for details.
1678 0 -- permissive (log only, no denials).
1679 1 -- enforcing (deny and log).
1712 See also Documentation/fault-injection/.
1716 See Documentation/admin-guide/sysctl/net.rst for
1720 See Documentation/admin-guide/blockdev/floppy.rst.
1722 forcepae [X86-32]
1729 fred= [X86-64]
1780 ftrace_filter=[function-list]
1782 tracer at boot up. function-list is a comma-separated
1787 ftrace_notrace=[function-list]
1789 function-list. This list can be changed at run time
1793 ftrace_graph_filter=[function-list]
1796 function-list is a comma-separated list of functions
1800 ftrace_graph_notrace=[function-list]
1802 function-list. This list is a comma-separated list of
1822 off -- Don't create device links from firmware info.
1823 permissive -- Create device links from firmware info
1826 on -- Create device links from firmware info and use it
1828 rpm -- Like "on", but also use to order runtime PM.
1841 strict -- Default. Continue waiting on consumers to
1843 timeout -- Give up waiting on consumers and call
1853 See also Documentation/input/devices/joystick-parport.rst
1857 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1883 gcov_persist= [GCOV] When non-zero (default), profiling data for
1893 gpio-mockup.gpio_mockup_ranges
1896 gpio-mockup.gpio_mockup_named_lines
1928 against bounds-checking flaws in the kernel's
1936 [KNL] Should the hard-lockup detector generate
1952 auto - Hash pointers unless slab_debug is enabled.
1953 always - Always hash pointers (even if slab_debug is
1955 never - Never hash pointers. This option should only
1966 for 64-bit NUMA, off otherwise.
1974 corresponding firmware-first mode error processing
1984 during restoration read-only).
2038 hpet= [X86-32,HPET] option to control HPET usage
2055 number of pages to allocate per-node can be specified.
2056 See also Documentation/admin-guide/mm/hugetlbpage.rst.
2067 Documentation/admin-guide/mm/hugetlbpage.rst.
2077 Note that this parameter only applies to non-gigantic huge pages.
2087 boot-time allocation of gigantic hugepages is skipped.
2120 When set to a non-zero value, a kernel panic will be triggered if
2128 CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time option. The value
2134 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
2156 Set device-properties for ACPI-enumerated I2C-attached
2157 touchscreen, to e.g. fix coordinates of upside-down
2165 Omit "=<val>" entirely Set a boolean device-property
2166 Unsigned number Set a u32 device-property
2167 Anything else Set a string device-property
2170 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
2171 touchscreen-inverted-y
2173 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
2174 touchscreen-size-y=1080:touchscreen-inverted-y:
2175 firmware-name=gsl1680-vendor-model.fw:silead,home-button
2180 (disabled by default, and as a pre-condition
2182 i8042.direct [HW] Put keyboard port into non-translated mode
2196 suspend-to-ram transitions, only during s2r
2220 -1 -- never invert brightness
2221 0 -- machine default
2222 1 -- force brightness inversion
2224 ia32_emulation= [X86-64]
2226 When true, allows loading 32-bit programs and executing 32-bit
2251 idle=nomwait: Disable mwait for CPU C-states
2279 legacy only accept legacy-NaN binaries, if supported
2281 2008 only accept 2008-NaN binaries, if supported
2292 'relaxed' straps the emulator for both legacy-NaN and
2293 2008-NaN, whereas 'strict' enables legacy-NaN only on
2302 Ignore loglevel setting - this will print /all/
2369 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2370 "ima-sigv2" }
2371 Default: "ima-ng"
2392 stuff: Deploy RSB-fill mitigation when retpoline is
2397 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2408 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2409 initcall functions. Useful for debugging built-in
2454 0 -- basic integrity auditing messages. (Default)
2455 1 -- additional integrity auditing messages.
2483 could harm performance of some high-throughput
2492 1 to 9 specify maximum depth of C-state.
2501 algorithms for p-state selection. There are two
2502 P-state selection algorithms provided by
2505 on whether or not the hardware managed P-states
2512 used along with the hardware-managed P-states (HWP)
2516 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2517 instead of acpi-cpufreq may disable platform features, such
2519 P-States information being indicated to OSPM and therefore
2522 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2535 Allow per-logical-CPU P-State performance control limits using
2538 Do not enable capacity-aware scheduling (CAS) on
2541 intremap= [X86-64,Intel-IOMMU,EARLY]
2546 BIOS x2APIC opt-out request will be ignored
2585 AMD Gart HW IOMMU-specific options:
2604 Do scatter-gather (SG) merging. Implies "force"
2608 Don't do scatter-gather (SG) merging.
2621 0 - Try to allocate a 32-bit DMA address first, before
2623 1 - Allocate directly from the full usable range,
2625 greater than 32-bit addressing.
2629 0 - Lazy mode.
2635 1 - Strict mode.
2638 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2640 legacy driver-specific options takes precedence.
2645 0 - Use IOMMU translation for DMA.
2646 1 - Bypass the IOMMU for DMA.
2647 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2655 0 - Sanitizer disabled.
2656 1 - Sanitizer enabled, expect runtime overhead.
2658 io7= [HW] IO7 for Marvel-based Alpha systems
2673 See Documentation/admin-guide/nfs/nfsroot.rst.
2709 Enables support for pseudo-NMIs in the kernel. This
2714 [RISC-V,EARLY]
2716 as IPIs. Intended for system where IMSIC is trap-n-emulated,
2728 long-running IRQs in the system.
2740 [Deprecated - use cpusets instead]
2741 Format: [flag-list,]<cpu-list>
2774 "number of CPUs in system - 1".
2800 The format of <cpu-list> is described above.
2804 ivrs_ioapic [HW,X86-64]
2805 Provide an override to the IOAPIC-ID<->DEVICE-ID
2809 For example, to map IOAPIC-ID decimal 10 to
2815 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2818 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2822 ivrs_hpet [HW,X86-64]
2823 Provide an override to the HPET-ID<->DEVICE-ID
2827 For example, to map HPET-ID decimal 10 to
2833 * To map HPET-ID decimal 0 to PCI device 00:14.0
2836 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2840 ivrs_acpihid [HW,X86-64]
2841 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2845 For example, to map UART-HID:UID AMD0020:0 to
2851 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2854 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2878 the kernel for non-movable allocations. The requested
2888 subsystem. Note that allocations like PTEs-from-HighMem
2896 for non-movable allocations and remaining memory is used
2907 [MM,KFENCE] Whether to check all KFENCE-managed objects'
2914 allocations. This avoids forcing CPU wake-ups if the
2922 report - print the error report and continue (default).
2923 oops - print the error report and oops.
2924 panic - print the error report and panic.
2929 0 - Disable KFENCE.
2930 >0 - Enabled KFENCE with given sample interval.
2948 gdb or control-c on the dbgp connection. When
2949 not using this parameter you use sysrq-g to break into
2954 or a supported polling keyboard driver (non-usb).
2983 "0" | "off" | "n" - kexec handover is disabled
2984 "1" | "on" | "y" - kexec handover is enabled
2990 ranges that can only be used for non-kernel
3001 parameter defines the size of additional per-node
3006 Configure the RouterBoard 532 series on-chip
3009 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
3015 kprobe_event=[probe-list]
3017 The probe-list is a semicolon delimited list of probe
3047 execution by eliminating the write-protection faults
3071 can be overridden on a per-VM basis via
3079 with an in-kernel local APIC, e.g. to deliver PMIs to
3080 the guest. Running without an in-kernel local APIC is
3094 virtualization on-demand when creating and destroying
3102 is that doing so may interfere with using out-of-tree
3129 back to huge pages. If the value is a non-zero N, KVM will
3134 kvm-{amd,intel}.enable_mediated_pmu=[KVM,AMD,INTEL]
3136 instead of the default perf-based virtual PMU (if
3140 With a perf-based vPMU, KVM operates as a user of perf,
3142 KVM-created perf events are managed by perf as regular
3143 (guest-only) events, e.g. are scheduled in/out, contend
3144 for hardware resources, etc. Using a perf-based vPMU
3145 allows guest and host usage of the PMU to co-exist, but
3146 incurs non-trivial overhead and can result in silently
3158 to profile KVM guests and adds latency to most VM-Exits
3163 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
3166 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
3167 a.k.a. Two-Dimensional Page Tables. Default is 1
3171 kvm-amd.ciphertext_hiding_asids=
3176 If ciphertext hiding is enabled, the joint SEV-ES and
3177 SEV-SNP ASID space is partitioned into separate SEV-ES
3178 and SEV-SNP ASID ranges, with the SEV-SNP range being
3179 [1..max_snp_asid] and the SEV-ES range being
3183 A non-zero value enables SEV-SNP ciphertext hiding and
3184 adjusts the ASID ranges for SEV-ES and SEV-SNP guests.
3185 KVM caps the number of SEV-SNP ASIDs at the maximum
3186 possible value, e.g. specifying -1u will assign all
3187 joint SEV-ES and SEV-SNP ASIDs to SEV-SNP. Note,
3188 assigning all joint ASIDs to SEV-SNP, i.e. configuring
3189 max_snp_asid == min_sev_asid-1, will effectively make
3190 SEV-ES unusable.
3192 kvm-arm.mode=
3198 nvhe: Standard nVHE-based mode, without support for
3205 nested: VHE-based mode with support for nested
3213 command-line.
3217 kvm-arm.vgic_v3_group0_trap=
3218 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
3221 kvm-arm.vgic_v3_group1_trap=
3222 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
3225 kvm-arm.vgic_v3_common_trap=
3229 kvm-arm.vgic_v4_enable=
3233 kvm-arm.wfe_trap_policy=
3242 kvm-arm.wfi_trap_policy=
3259 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
3260 a.k.a. Two-Dimensional Page Tables. Default is 1
3264 kvm-intel.emulate_invalid_guest_state=
3266 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
3272 kvm-intel.flexpriority=
3277 kvm-intel.nested=
3281 kvm-intel.unrestricted_guest=
3287 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
3288 CVE-2018-3620.
3299 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
3319 on - enable the interface for the mitigation
3384 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3390 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3394 value for LAPIC timer one-shot implementation. Default
3417 libata.force= [LIBATA] Force configurations. The format is a comma-
3429 first fan-out link behind PMP device. It does not
3443 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3450 * rstonce: only attempt one reset during hot-unplug
3486 number of 512-byte sectors, to the value specified in
3488 a non-zero positive integer.
3498 * external: Mark port as external (hotplug-capable).
3555 Specify the number of self-propagating call_rcu()
3563 occasional long-duration lock hold time. Defaults
3574 Set the number of locking read-acquisition kthreads.
3579 Set the number of locking write-acquisition kthreads.
3582 Set time (s) after boot for CPU-hotplug testing.
3585 Set time (s) between CPU-hotplug operations, or
3586 zero to disable CPU-hotplug testing.
3589 Do periodic testing of real-time lock priority
3594 non-real-time spinlocks, due to their disabling
3595 of preemption. Note that non-realtime mutexes
3608 Set task-shuffle interval (jiffies). Shuffling
3609 tasks allows some CPUs to go into dyntick-idle
3614 is useful for hands-off automated testing.
3633 Run the write-side locktorture kthreads at
3634 sched_set_fifo() real-time priority.
3652 7 (KERN_DEBUG) debug-level messages
3664 logo.nologo [FB] Disables display of the built-in Linux logo.
3682 an IEEE 1284-compliant printer is attached; if
3688 time-consuming boot-time autodetection (up to 250 ms per
3708 Example: machtype=lemote-yeeloong-2f-7inch
3720 (loop.max_loop) unconditionally pre-created at init time. The default
3723 devices can be requested on-demand with the
3724 /dev/loop-control interface.
3726 mce= [X86-{32,64}]
3763 do not opt-in to Local MCE delivery. Use legacy method
3784 don't overwrite the bios-set CMCI threshold. This boot
3793 force-enable recoverable machine check code paths
3799 See Documentation/admin-guide/md.rst.
3806 Control mitigation for the Micro-architectural Data
3821 full - Enable MDS mitigation on vulnerable CPUs
3822 full,nosmt - Enable MDS mitigation and disable
3824 off - Unconditionally disable MDS mitigation
3826 On TAA-affected machines, mds=off can be prevented by
3835 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3850 [ARC,MICROBLAZE] - the limit applies only to low memory,
3853 [ARM64] - only limits memory covered by the linear
3866 [ARM,MIPS,EARLY] - override the memory layout
3873 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3880 per-device physically contiguous DMA buffers.
3888 See Documentation/admin-guide/mm/memory-hotplug.rst.
3913 Example: Exclude memory from 0x18690000-0x1869ffff
3927 memmap=<size>%<offset>-<oldtype>+<newtype>
3929 from <oldtype> to <newtype>. If "-<oldtype>" is left
3944 repeatable BIOS-originated corruption always
3988 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3994 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3998 s2idle - Suspend-To-Idle
3999 shallow - Power-On Suspend or equivalent (if supported)
4000 deep - Suspend-To-RAM or equivalent (if supported)
4001 See Documentation/admin-guide/pm/sleep-states.rst.
4003 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
4013 base_rev=X - with <X> with format: <u32>
4027 0 - The attached screen is the 3.5" TFT
4028 1 - The attached screen is the 7" TFT
4029 2 - The VGA Shield is attached (1024x768)
4033 b - Enable backlight. The TFT backlight pin will be
4037 c - Enable the s3c camera interface.
4038 t - Reserved for enabling touchscreen support. The
4042 https://repo.or.cz/w/linux-2.6/mini2440.git
4047 arch-independent options, each of which is an
4048 aggregation of existing arch-specific options.
4078 ssbd=force-off [ARM64]
4093 have other ways of avoiding SMT-based attacks.
4107 supports attack-vector based controls as documented in
4108 Documentation/admin-guide/hw-vuln/attack_vector_controls.rst
4132 full - Enable mitigation on vulnerable CPUs
4134 full,nosmt - Enable mitigation and disable SMT on
4137 off - Unconditionally disable mitigation
4150 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
4180 module_blacklist= [KNL] Do not load a comma-separated list of
4205 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
4212 Format: <name>,<region-number>,<size>,<offset>
4215 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
4254 something different and driver-specific.
4294 [NFS] enable 64-bit inode numbers.
4295 If zero, the NFS client will fake up a 32-bit inode
4297 of returning the full 64-bit number.
4298 The default is to return 64-bit inode numbers.
4333 [NFS4] Specify an additional fixed unique ident-
4364 driver. A non-zero value sets the minimum interval
4369 server-to-server copies for which this server is
4381 server-to-server copy, knfsd temporarily mounts
4388 See Documentation/admin-guide/nfs/nfsroot.rst.
4390 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
4391 See Documentation/admin-guide/nfs/nfsroot.rst.
4394 See Documentation/admin-guide/nfs/nfsroot.rst.
4398 NMI stack-backtrace request.
4407 0 - turn hardlockup detector in nmi_watchdog off
4408 1 - turn hardlockup detector in nmi_watchdog on
4409 rNNN - configure the watchdog with raw perf event 0xNNN
4422 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4426 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4427 Forces kernel to use 3-level paging instead.
4429 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4430 kernel to use 4-level paging instead.
4465 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4467 noexec32 [X86-64]
4468 This affects only 32-bit executables.
4469 noexec32=on: enable non-executable mappings (default)
4471 noexec32=off: disable non-executable mappings
4482 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4484 legacy floating-point registers on task switch.
4531 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4533 [Deprecated - use intremap=off]
4539 noirqdebug [X86-32] Disables the code which attempts to detect and
4549 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4552 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4554 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4556 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4558 nomce [X86-32] Disable Machine Check Exception
4560 nomfgpt [X86-32] Disable Multi-Function General Purpose
4566 not load if they could possibly displace the pre-
4569 perform display-mode changes or accelerated rendering.
4582 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4587 nopti [X86-64,EARLY]
4603 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4609 no-scroll [VGA] Disables scrollback.
4610 This is required for the Braillex ib80-piezo Braille
4613 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4633 nosoftlockup [KNL] Disable the soft-lockup detector.
4639 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4652 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4659 timer IRQ sources, i.e., the IO-APIC timer. This can
4664 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4677 no-vmw-sched-clock
4682 soft-lockup and NMI watchdog (hard-lockup).
4686 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4694 enabling legacy floating-point and sse state.
4716 n. So during boot up some boot time memory for per-cpu
4717 variables need be pre-allocated for later physical cpu
4744 soft-reserved memory partitioning.
4753 See Documentation/admin-guide/sysctl/vm.rst for details.
4755 nvme.quirks= [NVME] A list of quirk entries to augment the built-in
4757 '-' character.
4759 The IDs are 4-digits hex numbers and quirk_names is a
4765 nvme.quirks=7710:2267:bogus_nid,^identify_cns-9900:7711:broken_msi
4768 See Documentation/core-api/debugging-via-ohci1394.rst for more
4783 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4787 boundary - index of last SLC block on Flex-OneNAND.
4789 lock - Configure if Flex-OneNAND boundary should be locked.
4808 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4814 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4842 See Documentation/admin-guide/tainted-kernels.rst for
4855 constraints, or platform-specific requirements where only
4929 Set to non-zero to probe primary and secondary ISA
4935 Set to non-zero if a chip is present that snoops speed
4983 Set to non-zero to probe tertiary and further ISA
4999 Set to non-zero to probe QDI controllers. By default
5004 Set to non-zero to probe Winbond controllers. Use
5051 bios [X86-32] force use of PCI BIOS, don't access
5053 has a non-standard PCI host bridge.
5054 nobios [X86-32] disallow use of PCI BIOS, only direct
5060 data in IO port 0xCFC, both 32-bit).
5062 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
5063 the function, IO port 0xCFA, also 8-bit, sets
5065 through ports 0xC000-0xCFFF).
5072 root domains (aka PCI segments, in ACPI-speak).
5080 disable the use of MSI interrupts system-wide.
5085 primary IO-APIC for bridges that cannot disable
5092 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
5116 F0000h-100000h range.
5121 assign-busses [X86] Always assign all PCI bus
5142 <linux-pci@vger.kernel.org>.
5146 a bug to <linux-pci@vger.kernel.org>.
5158 bfsort Sort PCI devices into breadth-first order.
5161 nobfsort Don't sort PCI devices into breadth-first order.
5163 tuning and use the BIOS-configured MPS defaults.
5173 configuration allows peer-to-peer DMA between
5176 that hot-added devices will work.
5191 A PCI-PCI bridge can be specified if resource
5197 for 4096-byte alignment.
5199 end-to-end CRC checking). Only effective if
5230 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
5261 bit-0 : ACS Source Validation
5262 bit-1 : ACS Translation Blocking
5263 bit-2 : ACS P2P Request Redirect
5264 bit-3 : ACS P2P Completion Redirect
5265 bit-4 : ACS Upstream Forwarding
5266 bit-5 : ACS P2P Egress Control
5267 bit-6 : ACS Direct Translated P2P
5277 Validation unchanged from whatever power-up
5289 system-wide.
5303 dpc-native Use native PCIe service for DPC only. May
5320 Keep all power-domains already enabled by bootloader on,
5338 pirq= [SMP,APIC] Manual mp-table setup
5339 See Documentation/arch/x86/i386/IO-APIC.rst.
5343 See also Documentation/admin-guide/parport.rst.
5362 resume of devices during system-wide power transitions.
5364 dependencies are not well-defined, or for debugging
5374 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
5383 { on | off | curr | res | no-curr | no-res }
5428 none - Limited to cond_resched() calls
5429 voluntary - Limited to cond_resched() and might_sleep() calls
5430 full - Any section that isn't explicitly preempt disabled
5434 lazy - Scheduler controlled. Similar to full but instead
5440 print-fatal-signals=
5446 coredump - etc.
5449 you might want to try "ulimit -i unlimited".
5461 or lockdep-detected issues (only if lock debug is on).
5469 Allows storing messages from non-panic CPUs into
5471 flushed to consoles by the panic-CPU on
5472 a best-effort basis.
5478 on - unlimited logging to /dev/kmsg from userspace
5479 off - logging to /dev/kmsg disabled
5480 ratelimit - ratelimit the logging
5491 - 'always': traditional behavior always allows mem overrides.
5492 - 'ptrace': only allow mem overrides for active ptracers.
5493 - 'never': never allow mem overrides.
5497 Limit processor to maximum C-state
5501 Ignore the _CST method to determine C-states,
5508 Param: "schedule" - profile schedule points.
5509 Param: "kvm" - profile VM exits.
5510 Param: <number> - step/bucket size as a power of 2 for
5539 pti= [X86-64] Control Page Table Isolation of user and
5544 on - unconditionally enable
5545 off - unconditionally disable
5546 auto - kernel detects whether your CPU model is
5552 [KNL] Number of legacy pty's. Overwrites compiled-in
5564 See Documentation/admin-guide/md.rst.
5567 See Documentation/admin-guide/blockdev/ramdisk.rst.
5586 cross-syscall address exposures. This is only
5592 ras=option[,option,...] [KNL] RAS-specific options
5598 rcu_nocbs[=cpu-list]
5603 enable the no-callback CPU mode, which prevents
5608 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5612 and real-time workloads. It can also improve
5616 list of CPUs is set to no-callback mode from boot.
5620 no-callback mode from boot but the mode may be
5631 This improves the real-time response for the
5642 Do only a one-line RCU CPU stall warning when
5643 there is an ongoing too-long CSD-lock wait.
5649 If triggered before the RCU grace-period machinery
5659 RCU grace-period cleanup.
5663 RCU grace-period initialization.
5667 RCU grace-period pre-initialization, that is,
5668 the propagation of recent CPU-hotplug changes up
5672 Set delay from grace-period initialization to
5685 soliciting quiescent-state help from
5697 Set the SCHED_FIFO priority of the RCU per-CPU
5700 and for the RCU grace-period kthreads (rcu_bh,
5702 set, valid values are 1-99 and the default is 1
5703 (the least-favored priority). Otherwise, when
5704 RCU_BOOST is not set, valid values are 0-99 and
5705 the default is zero (non-realtime operation).
5710 On callback-offloaded (rcu_nocbs) CPUs,
5713 use of the ->nocb_bypass list. However, in the
5714 common non-flooded case, RCU queues directly to
5715 the main ->cblist in order to avoid the extra
5716 overhead of the ->nocb_bypass list and its lock.
5718 a single jiffy, RCU pre-queues the callbacks into
5719 the ->nocb_bypass queue. The definition of "too
5723 On callback-offloaded (rcu_nocbs) CPUs, avoid
5736 batch limiting is re-enabled.
5740 RCU's force-quiescent-state scan will aggressively
5748 Set the page-cache refill delay (in milliseconds)
5749 in response to low-memory conditions. The range
5753 Set the shift-right count to use to compute
5754 the callback-invocation batch limit bl from
5761 Please note that this callback-invocation batch
5762 limit applies only to non-offloaded callback
5771 cache-to-cache transfer latencies.
5777 and for NUMA systems with large remote-access
5793 the wakeup overhead on the global grace-period
5795 each group's NOCB grace-period kthread.
5798 Cause the grace-period kthread to get an extra
5800 it should at force-quiescent-state time.
5813 this specifies an rcu_read_unlock()-time delay
5817 of RCU-protected pointers after the relevant
5827 per-CPU rcuc kthreads. Defaults to a non-zero
5857 grace-period primitives such as call_rcu().
5868 grace-period primitives.
5871 Set test-start holdoff period. The purpose of
5889 Test the double-argument variant of kfree_rcu().
5891 rcuscale.kfree_rcu_test_single, both the single-
5892 and double-argument variants are tested.
5895 Test the single-argument variant of kfree_rcu().
5897 rcuscale.kfree_rcu_test_double, both the single-
5898 and double-argument variants are tested.
5912 does not affect the data-collection interval,
5917 Set number of RCU readers. The value -1 selects
5919 "n" less than -1 selects N-n+1, where N is again
5920 the number of CPUs. For example, -2 selects N
5921 (the number of CPUs), -3 selects N+1, and so on.
5922 A value of "n" less than or equal to -N selects
5935 complete. This is useful for hands-off automated
5942 Write-side holdoff between grace periods,
5947 Additional write-side holdoff between grace
5965 for RCU grace-period forward-progress testing
5972 Specify the fraction of a CPU-stall-warning
5973 period to do tight-loop forward-progress testing.
5977 forward-progress tests.
5981 need_resched() during tight-loop forward-progress
5985 Use conditional/asynchronous update-side
5986 normal-grace-period primitives, if available.
5989 Use conditional/asynchronous update-side
5990 expedited-grace-period primitives, if available.
5993 Use conditional/asynchronous update-side
5994 normal-grace-period primitives that also take
5999 Use conditional/asynchronous update-side
6000 expedited-grace-period primitives that also take
6024 Use expedited update-side primitives, if available.
6027 Use normal (non-expedited) asynchronous
6028 update-side primitives, if available.
6031 Use polled update-side normal-grace-period
6035 Use polled update-side expedited-grace-period
6039 Use polled update-side normal-grace-period
6044 Use polled update-side expedited-grace-period
6068 Use normal (non-expedited) synchronous
6069 update-side primitives, if available. If all
6073 they are all non-zero.
6076 Enable grace-period wrap lag testing. Setting
6081 Set the value for grace-period wrap lag during
6096 the grace-period wrap lag will be set to the
6106 Leak an RCU-protected pointer out of the reader.
6121 Set number of RCU callback-offload togglers.
6126 callback-offload toggling attempts.
6129 Set number of RCU readers. The value -1 selects
6130 N-1, where N is the number of CPUs. A value
6131 "n" less than -1 selects N-n-2, where N is again
6132 the number of CPUs. For example, -2 selects N
6133 (the number of CPUs), -3 selects N+1, and so on.
6136 Enable debug-object double-call_rcu() testing.
6139 Set time (s) after boot for CPU-hotplug testing.
6142 Set time (jiffies) between CPU-hotplug operations,
6143 or zero to disable CPU-hotplug testing.
6147 by a high-priority FIFO real-time task. Set to
6156 second) between preemptions by a high-priority
6157 FIFO real-time task. This delay is mediated
6162 The number of times in a given read-then-exit
6163 episode that a set of read-then-exit kthreads
6168 read-then-exit testing episodes.
6173 are entered from low-order bit up, and are
6175 0x1 bit is normal readers, 0x2 NMI-safe readers,
6176 and 0x4 light-weight readers.
6179 Set task-shuffle interval (s). Shuffling tasks
6180 allows some CPUs to go into dyntick-idle mode
6185 is useful for hands-off automated testing.
6194 any other stall-related activity. Note that
6200 in scheduling-while-atomic splats.
6219 grace-period kthread to test RCU CPU stall
6243 of RCU priority-boost testing. Defaults to zero,
6250 Test RCU's dyntick-idle handling. See also the
6305 Use expedited grace-period primitives, for
6309 real-time latency, and degrade energy efficiency.
6313 Use only normal grace-period primitives,
6316 real-time latency, CPU utilization, and
6318 increased grace-period latency. This parameter
6325 only normal grace-period primitives. No effect
6331 post-boot attempt at an expedited RCU grace
6332 period to instead use normal non-expedited
6333 grace-period processing.
6341 set to the default value of -1.
6344 Set the minimum number of callback-queuing-time
6345 lock-contention events per jiffy required to
6346 cause the RCU Tasks flavors to switch to per-CPU
6349 the default value of -1.
6354 of -1 allows this to be automatically (and
6360 cancel laziness on that CPU. Use -1 to disable
6370 only printed prior to the stall-warning message
6410 force - Override the decision by the kernel to hide the
6454 There are some built-in platform specific "quirks"
6455 - you may see: "reboot: <name> series board detected.
6459 built-in quirk table, and use the generic default
6492 Set test-start holdoff period. The purpose of
6507 but the default has already reduced the per-pass
6512 Set number of readers. The default value of -1
6521 Set the read-side critical-section duration,
6525 Specify the read-protection implementation to test.
6551 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6581 reservetop= [X86-32,EARLY]
6598 See Documentation/power/swsusp-and-swap-files.rst
6614 AMD-based UNRET and IBPB mitigations alone do not stop
6616 sibling threads. For that reason, STIBP is used on pro-
6620 off - no mitigation
6621 auto - automatically select a mitigation
6622 auto,nosmt - automatically select a mitigation,
6626 ibpb - On AMD, mitigate short speculation
6631 ibpb,nosmt - Like "ibpb" above but will disable SMT
6635 unret - Force enable untrained return thunks,
6636 only effective on AMD f15h-f17h based
6638 unret,nosmt - Like unret, but will disable SMT when STIBP
6678 ro [KNL] Mount root device read-only on boot
6681 on Mark read-only kernel memory as read-only (default).
6682 off Leave read-only kernel memory writable for debugging.
6683 noalias Mark read-only kernel memory as read-only but retain
6691 debug-uart get routed to the D+ and D- pins of the usb
6697 block/early-lookup.c for details.
6739 rw [KNL] Mount root device read-write on boot
6768 solution to mutex-based priority inversion.
6798 to 10 seconds for built-in smp_call_function()
6805 that requesting even small non-zero numbers of
6812 The default of -1 specifies a number of kthreads
6817 test before initiating CPU-hotplug operations.
6821 CPU-hotplug operations. Specifying zero (which
6822 is the default) disables CPU-hotplug operations.
6828 Non-zero values are useful for automated tests.
6851 "wait" parameter. A value of -1 selects the
6852 default if all other weights are -1. However,
6854 value of -1 will instead select a weight of zero.
6859 non-zero "wait" parameter. See weight_single.
6872 non-zero "wait" parameter. See weight_single
6884 non-zero "wait" parameter. See weight_single
6895 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6896 1 -- enable.
6907 0 -- disable.
6908 1 -- enable.
6911 serialnumber [BUGS=X86-32]
6913 sev=option[,option...] [X86-64]
6919 Do not enable SEV-SNP (applies to host/hypervisor
6922 SEV-SNP guests.
6930 to set it to "all" by meaning -- no limit here.
6942 Documentation/admin-guide/mm/slab.rst.
6953 Documentation/admin-guide/mm/slab.rst.
6969 Documentation/admin-guide/mm/slab.rst.
6975 Documentation/admin-guide/mm/slab.rst.
6990 Documentation/admin-guide/mm/slab.rst.
7017 using the csdlock_debug- kernel parameter.
7022 system. By default, let CSD-lock acquisition
7024 for this value provides a 5-minute timeout.
7026 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
7027 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
7028 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
7029 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
7030 smsc-ircc2.ircc_irq= [HW] IRQ line
7031 smsc-ircc2.ircc_dma= [HW] DMA channel
7032 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
7042 Default: -1 (no limit)
7045 [KNL] Should the soft-lockup detector generate panics.
7048 A value of non-zero instructs the soft-lockup detector
7049 to panic the machine when a soft-lockup duration exceeds
7052 respective build-time switch to that functionality.
7055 [KNL] Should the soft-lockup detector generate
7060 See Documentation/admin-guide/laptops/sonypi.rst
7067 on - (default) Enable the HW or SW mitigation as
7070 vmexit - On systems which don't have the HW mitigation
7073 protected from VM-originated BHI attacks, but
7075 off - Disable the mitigation.
7082 on - unconditionally enable, implies
7084 off - unconditionally disable, implies
7086 auto - kernel detects whether your CPU model is
7105 retpoline - replace indirect branches
7106 retpoline,generic - Retpolines
7107 retpoline,lfence - LFENCE; indirect branch
7108 retpoline,amd - alias for retpoline,lfence
7109 eibrs - Enhanced/Auto IBRS
7110 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
7111 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
7112 ibrs - use IBRS to protect kernel
7122 on - Unconditionally enable mitigations. Is
7125 off - Unconditionally disable mitigations. Is
7128 prctl - Indirect branch speculation is enabled,
7134 - Like "prctl" above, but only STIBP is
7140 - Same as "prctl" above, but all seccomp
7145 - Like "seccomp" above, but only STIBP is
7150 auto - Kernel selects the mitigation depending on
7161 off - Disable mitigation
7162 microcode - Enable microcode mitigation only
7163 safe-ret - Enable sw-only safe RET mitigation (default)
7164 ibpb - Enable mitigation by issuing IBPB on
7166 ibpb-vmexit - Issue IBPB only on VMEXIT
7167 (cloud-specific mitigation)
7192 on - Unconditionally disable Speculative Store Bypass
7193 off - Unconditionally enable Speculative Store Bypass
7194 auto - Kernel detects whether the CPU model contains an
7200 prctl - Control Speculative Store Bypass per thread
7204 seccomp - Same as "prctl" above, but all seccomp threads
7212 on,auto - On Power8 and Power9 insert a store-forwarding
7216 off - No action.
7230 off - not enabled
7232 warn - the kernel will emit rate-limited warnings
7240 fatal - the kernel will send SIGBUS to applications
7245 ratelimit:N -
7265 Certain CPUs are vulnerable to an MDS-like
7285 This kernel-boot parameter defaults to 128,
7286 but takes effect only when the low-order four
7303 instead of the compile-time CONFIG_NR_CPUS.
7307 grace-period sequence counter wrap for the
7308 srcu_data structure's ->srcu_gp_seq_needed field.
7323 Specifies the number of no-delay instances
7330 Specifies the per-grace-period phase, number of
7331 non-sleeping polls of readers. Beyond this limit,
7337 Specifies number of microseconds of non-sleeping
7338 delay between each non-sleeping poll of readers.
7341 Specifies the number of update-side contention
7346 set for contention-based conversions to occur.
7356 force-on: Unconditionally enable mitigation for
7358 force-off: Unconditionally disable mitigation for
7380 stack traces. Pools are allocated on-demand up to this
7386 stacktrace_filter=[function-list]
7388 will trace at boot up. function-list is a comma-separated
7396 Set the STI (builtin display/keyboard on the HP-PARISC
7398 as the initial boot-console.
7461 to global on non-NUMA machines)
7486 <int> -- Number of I/O TLB slabs
7487 <int> -- Second integer after comma. Number of swiotlb
7490 force -- force using of bounce buffers even if they
7492 noforce -- Never use bounce buffers (for debugging)
7507 Ignore sysrq setting - this boot parameter will
7515 cache size. See Documentation/networking/ip-sysctl.rst
7522 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7527 wakeup-capable RTC alarm.
7533 -1: disable all active trip points in all thermal zones
7537 -1: disable all critical trip points in all thermal zones
7544 -1: disable all passive trip points
7550 <deci-seconds>: poll all this frequency
7554 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7559 See Documentation/admin-guide/mm/transhuge.rst for more
7567 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7573 See Documentation/admin-guide/mm/transhuge.rst for more
7585 Prevent the CPU-hotplug component of torturing
7589 Dump the ftrace buffer at torture-test shutdown,
7593 with rotating-rust storage.
7598 disables verbose-printk() sleeping.
7601 Duration of each verbose-printk() sleep in jiffies.
7634 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7672 local - Use the per CPU time stamp counter
7676 global - Event time stamps are synchronized across
7679 counter - Simple counting of events (1, 2, ..)
7683 uptime - Use jiffies as the time stamp.
7684 perf - Use the same clock that perf uses.
7685 mono - Use ktime_get_mono_fast_ns() for time stamps.
7686 mono_raw - Use ktime_get_raw_fast_ns() for time
7688 boot - Use ktime_get_boot_fast_ns() for time stamps.
7692 trace_event=[event-list]
7694 to facilitate early boot debugging. The event-list is a
7695 comma-separated list of trace events to enable. See
7706 trace_instance=[instance-info]
7731 traceoff - Have the tracing instance tracing disabled after it is created.
7732 traceprintk - Have trace_printk() write into this trace instance
7779 trace_options=[option-list]
7781 The option-list is a comma delimited list of options
7795 trace_trigger=[trigger-list]
7841 See Documentation/admin-guide/mm/transhuge.rst
7848 See Documentation/admin-guide/mm/transhuge.rst
7855 See Documentation/admin-guide/mm/transhuge.rst
7863 - "tpm"
7864 - "tee"
7865 - "caam"
7866 - "dcp"
7867 - "pkwm"
7877 - "kernel"
7878 - the same value as trusted.source: "tpm" or "tee"
7879 - "default"
7902 off - disable the mitigation
7903 on - enable the mitigation (default)
7904 user - mitigate only user/kernel transitions
7905 vm - mitigate only guest/host transitions
7913 high-resolution timer mode on older hardware, and in
7944 on - Enable TSX on the system. Although there are
7947 several previous speculation-related CVEs, and
7951 off - Disable TSX on the system. (Note that this
7959 auto - Disable TSX if X86_BUG_TAA is present,
7964 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7970 Similar to Micro-architectural Data Sampling (MDS)
7985 full - Enable TAA mitigation on vulnerable CPUs
7988 full,nosmt - Enable TAA mitigation and disable SMT on
7991 vulnerable to cross-thread TAA attacks.
7992 off - Unconditionally disable TAA mitigation
7994 On MDS-affected machines, tsx_async_abort=off can be
8006 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
8012 See also Documentation/input/devices/joystick-parport.rst
8014 udbg-immortal [PPC] When debugging early kernel crashes that
8020 Set number of hash buckets for UDP/UDP-Lite connections
8022 uhci-hcd.ignore_oc=
8024 Some badly-designed motherboards generate lots of
8049 unwind_debug [X86-64,EARLY]
8057 (default -1 = authorized (same as 1),
8063 for newly-detected USB devices (default 2). This
8091 [USB] Specifies timeout for the initial 64-byte
8098 [USB] A list of quirk entries to augment the built-in
8101 VendorID:ProductID:Flags. The IDs are 4-digit hex
8103 will change the built-in quirk; setting it if it is
8108 a 255-byte read);
8112 Set-Interface requests);
8131 (bInterval-1).
8153 o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra
8172 usb-storage.delay_use=
8179 usb-storage.quirks=
8181 override the built-in unusual_devs list. List
8184 and Product ID values (4-digit hex numbers) and
8186 to a common usb-storage quirk flag as follows:
8228 medium is write-protected).
8237 1 - undefined instruction events
8238 2 - system calls
8239 4 - invalid data aborts
8240 8 - SIGSEGV faults
8241 16 - SIGBUS faults
8250 vdso32= [X86] Control the 32-bit vDSO
8251 vdso32=1: enable 32-bit VDSO
8252 vdso32=0 or vdso32=2: disable 32-bit VDSO
8262 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
8293 vga= [BOOT,X86-32] Select a particular video mode
8295 Documentation/admin-guide/svga.rst.
8310 - Disable all of the above options
8336 hypervisor to a guest via speculative side-channels.
8338 off - disable the mitigation
8339 ibpb - use Indirect Branch Prediction Barrier
8341 force - force vulnerability detection even on
8344 vsyscall= [X86-64,EARLY]
8347 code). Most statically-linked binaries and older
8373 see vga-softcursor.rst. Default: 2 = underline.
8378 This is a 16-member array composed of values
8379 ranging from 0-255.
8384 This is a 16-member array composed of values
8385 ranging from 0-255.
8390 This is a 16-member array composed of values
8391 ranging from 0-255.
8396 Set system-wide default UTF-8 mode for all tty's.
8397 Default is 1, i.e. UTF-8 mode is enabled for all
8402 Format=<-1|0|1>
8403 Set system-wide default for whether a cursor
8404 is shown on new VTs. Default is -1,
8409 vt.italic= [VT] Default color for italic text; 0-15.
8412 vt.underline= [VT] Default color for underlined text; 0-15.
8416 see Documentation/watchdog/watchdog-parameters.rst
8417 or other driver-specific files in the
8431 Format: <cpu-list>
8458 The default is 0, which disables the time-based panic.
8461 Per-cpu work items which run for longer than this
8464 them from noticeably delaying other per-cpu work
8482 Per-cpu workqueues are generally preferred because
8484 locality; unfortunately, per-cpu workqueues tend to
8487 Enabling this makes the per-cpu workqueues which
8502 Documentation/core-api/workqueue.rst.
8515 forces round-robin CPU selection to flush out
8523 on - Enable writecombine, use WUC for ioremap_wc()
8524 off - Disable writecombine, use SUC for ioremap_wc()
8526 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
8530 xen_512gb_limit [KNL,X86-64,XEN]
8545 ide-disks -- unplug primary master IDE devices
8546 aux-ide-disks -- unplug non-primary-master IDE devices
8547 nics -- unplug network devices
8548 all -- unplug all emulated devices (NICs and IDE disks)
8549 unnecessary -- unplugging emulated devices is
8552 never -- do not unplug even if version check succeeds
8566 Select whether to always use non-faulting (safe) MSR
8586 xen_timer_slop= [X86-64,XEN,EARLY]
8611 preferred over the 2-level event handling, as it is
8628 xive.store-eoi=off [PPC]
8634 xhci-hcd.quirks [USB,KNL]