Lines Matching +full:spe +full:- +full:pmu
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nocmcff -- Disable firmware first mode for corrected
28 nospcr -- disable console in ACPI SPCR table as
45 If set to vendor, prefer vendor-specific driver
77 Documentation/firmware-guide/acpi/debug.rst for more information about
135 Format: <byte> or <bitmap-list>
138 Disable auto-serialization of AML methods
141 auto-serialization feature.
159 Ignore the ACPI-based watchdog interface (WDAT) and let
180 acpi_osi=! # disable all built-in OS vendor
182 acpi_osi=!! # enable all built-in OS vendor
244 For broken nForce2 BIOS resulting in XT-PIC timer.
253 as soon as the kernel's real-mode entry point is called.
291 See Documentation/sound/alsa-configuration.rst
298 align_va_addr= [X86-64]
303 CPU-intensive style benchmark, and it can vary highly in
306 32: only for 32-bit processes
307 64: only for 64-bit processes
308 on: enable for both 32- and 64-bit processes
309 off: disable for both 32- and 64-bit processes
319 Allow execve() of 32-bit applications and setting of the
321 subset of the CPUs support 32-bit EL0. When this
322 parameter is present, the set of CPUs supporting 32-bit
324 and hot-unplug operations may be restricted.
326 See Documentation/arch/arm64/asymmetric-32bit.rst for more
329 amd_iommu= [HW,X86-64]
332 fullflush - Deprecated, equivalent to iommu.strict=1
333 off - do not initialize any AMD IOMMU found in
335 force_isolation - Force device isolation for all
340 force_enable - Force enable the IOMMU on platforms known
343 pgtbl_v1 - Use v1 page table for DMA-API (Default).
344 pgtbl_v2 - Use v2 page table for DMA-API.
345 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
346 nohugepages - Limit page-sizes used for v1 page-tables
348 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
352 amd_iommu_dump= [HW,X86-64]
358 amd_iommu_intr= [HW,X86-64]
361 legacy - Use legacy interrupt remapping mode.
362 vapic - Use virtual APIC mode, which allows IOMMU
364 This mode requires kvm-amd.avic=1.
393 Disable amd-pstate preferred core.
406 Power management functions (SPARCstation-4/5 + deriv.)
408 Disable APC CPU standby support. SPARCstation-Fox does
409 not play well with APC CPU idle - disable it if you have
412 apic [APIC,X86-64] Use IO-APIC. Default.
418 when initialising the APIC and IO-APIC components.
442 0 -- disable.
443 1 -- enable.
446 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
497 audit= [KNL] Enable the audit sub-system
499 0 | off - kernel audit is disabled and can not be
501 unset - kernel audit is initialized but disabled and
503 1 | on - kernel audit is initialized and partially
516 0 - Disable the BAU.
517 1 - Enable the BAU.
518 unset - Disable the BAU.
557 See Documentation/block/cmdline-partition.rst
571 See Documentation/admin-guide/bootconfig.rst
576 bttv.pll= See Documentation/admin-guide/media/bttv.rst
585 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
604 inclusive. See arch/mips/include/asm/pgtable-bits.h
614 - foo isn't auto-mounted if you mount all cgroups in
616 - foo isn't visible as an individually mountable
618 - if foo is an optional feature then the feature is
624 Specifying "pressure" disables per-cgroup pressure
642 nosocket -- Disable socket memory accounting.
643 nokmem -- Disable kernel memory accounting.
644 nobpf -- Disable BPF memory accounting.
649 0 -- check protection applied by kernel (includes
651 1 -- check protection requested by application.
663 numbers X. Note the Linux-specific bits are not necessarily
664 stable over kernel options, but the vendor-specific
684 force such clocks to be always-on nor does it reserve
688 information, see Documentation/driver-api/clk.rst.
690 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
707 [X86-32] pit,hpet,tsc;
714 [X86-64] hpet,tsc
720 architected timer so that code using WFE-based polling
734 clocksource-wdtest.holdoff= [KNL]
740 cma=nn[MG]@[start[MG][-end[MG]]]
751 Sets the size of kernel per-numa memory area for
753 per-numa CMA altogether. And If this option is not
755 With per-numa CMA enabled, DMA users on node nid will
782 com20020= [HW,NET] ARCnet - COM20020 chipset
786 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
790 ARCnet - COM90xx chipset (memory-mapped buffers)
819 See Documentation/admin-guide/serial-console.rst for more
834 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
835 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
848 Start an early, polled-mode console on the 8250/16550
851 MMIO inter-register address stride is either 8-bit
852 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
856 the h/w is not re-initialized.
883 syscall, or to executing "dmesg -S --raw" or to reading
907 disable the cpuidle sub-system
913 disable the cpufreq sub-system
921 [X86,EARLY] Delay for N microsec between assert and de-assert
942 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
950 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
953 See Documentation/admin-guide/kdump/kdump.rst for further details.
958 start-[end] where start and end are both
960 Documentation/admin-guide/kdump/kdump.rst for an example.
963 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
971 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
977 for 32-bit devices won't run out. Kernel would try to allocate
980 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
981 --> arm64: 128MiB
982 --> riscv: 128MiB
983 --> loongarch: 128MiB
991 [KNL] Disable crypto self-tests
999 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1014 See also Documentation/input/devices/joystick-parport.rst
1027 [KNL] verbose locking self-tests
1030 self-tests.
1032 (no extra messages), setting it to -1 (all bits set)
1033 will print _a_lot_ more information - normally only
1068 Format: { on, no-mount, off }
1070 no-mount:
1075 get a -EPERM as result when trying to register files
1079 Default value is set in build-time with a kernel configuration.
1091 Documentation/admin-guide/mm/hugetlbpage.rst.
1105 delayacct [KNL] Enable per-task delay accounting
1191 entries for DMA-API debugging code. One entry is
1192 required per DMA-API allocation. Use this if the
1193 DMA-API debugging code disables itself because the
1197 With this option the DMA-API debugging driver
1221 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1246 Control how the dt_cpu_ftrs device-tree binding is
1256 what data is available or for reverse-engineering.
1261 Documentation/admin-guide/dynamic-debug-howto.rst
1272 determined by stdout-path property in device tree's
1277 Start an early, polled-mode console on a Cadence
1288 Start an early, polled-mode console on the 8250/16550
1290 MMIO inter-register address stride is either 8-bit
1291 (mmio) or 32-bit (mmio32 or mmio32be).
1301 Start an early, polled-mode console on a pl011 serial
1305 the driver will use only 32-bit accessors to read/write
1314 Start an early, polled-mode console on a meson serial
1320 Start an early, polled-mode console on an msm serial
1326 Start an early, polled-mode console on an msm serial
1332 Start an early, polled-mode console on a serial port
1338 Start an early, polled-mode console on a serial port
1344 Use RISC-V SBI (Supervisor Binary Interface) for early
1362 Start an early, polled-mode console on a lantiq serial
1376 Start an early, polled-mode, output-only console on the
1381 Start an early, polled-mode console on the
1387 Start an early, polled-mode console on a Qualcomm
1395 coherent non-x86 systems that use system memory for
1498 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1515 elanfreq= [X86-32]
1523 See Documentation/admin-guide/kdump/kdump.rst for details.
1539 0 -- permissive (log only, no denials).
1540 1 -- enforcing (deny and log).
1573 See also Documentation/fault-injection/.
1577 See Documentation/admin-guide/sysctl/net.rst for
1581 See Documentation/admin-guide/blockdev/floppy.rst.
1583 forcepae [X86-32]
1590 fred= [X86-64]
1641 ftrace_filter=[function-list]
1643 tracer at boot up. function-list is a comma-separated
1648 ftrace_notrace=[function-list]
1650 function-list. This list can be changed at run time
1654 ftrace_graph_filter=[function-list]
1657 function-list is a comma-separated list of functions
1661 ftrace_graph_notrace=[function-list]
1663 function-list. This list is a comma-separated list of
1683 off -- Don't create device links from firmware info.
1684 permissive -- Create device links from firmware info
1687 on -- Create device links from firmware info and use it
1689 rpm -- Like "on", but also use to order runtime PM.
1702 strict -- Default. Continue waiting on consumers to
1704 timeout -- Give up waiting on consumers and call
1714 See also Documentation/input/devices/joystick-parport.rst
1718 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1744 gcov_persist= [GCOV] When non-zero (default), profiling data for
1754 gpio-mockup.gpio_mockup_ranges
1757 gpio-mockup.gpio_mockup_named_lines
1789 against bounds-checking flaws in the kernel's
1797 [KNL] Should the hard-lockup detector generate
1803 for 64-bit NUMA, off otherwise.
1811 corresponding firmware-first mode error processing
1821 during restoration read-only).
1865 hpet= [X86-32,HPET] option to control HPET usage
1882 number of pages to allocate per-node can be specified.
1883 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1894 Documentation/admin-guide/mm/hugetlbpage.rst.
1904 Note that this parameter only applies to non-gigantic huge pages.
1914 boot-time allocation of gigantic hugepages is skipped.
1949 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1955 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1977 Set device-properties for ACPI-enumerated I2C-attached
1978 touchscreen, to e.g. fix coordinates of upside-down
1986 Omit "=<val>" entirely Set a boolean device-property
1987 Unsigned number Set a u32 device-property
1988 Anything else Set a string device-property
1991 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
1992 touchscreen-inverted-y
1994 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
1995 touchscreen-size-y=1080:touchscreen-inverted-y:
1996 firmware-name=gsl1680-vendor-model.fw:silead,home-button
2001 (disabled by default, and as a pre-condition
2003 i8042.direct [HW] Put keyboard port into non-translated mode
2017 suspend-to-ram transitions, only during s2r
2041 -1 -- never invert brightness
2042 0 -- machine default
2043 1 -- force brightness inversion
2045 ia32_emulation= [X86-64]
2047 When true, allows loading 32-bit programs and executing 32-bit
2072 idle=nomwait: Disable mwait for CPU C-states
2100 legacy only accept legacy-NaN binaries, if supported
2102 2008 only accept 2008-NaN binaries, if supported
2113 'relaxed' straps the emulator for both legacy-NaN and
2114 2008-NaN, whereas 'strict' enables legacy-NaN only on
2123 Ignore loglevel setting - this will print /all/
2190 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2191 "ima-sigv2" }
2192 Default: "ima-ng"
2225 stuff: Deploy RSB-fill mitigation when retpoline is
2230 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2241 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2242 initcall functions. Useful for debugging built-in
2287 0 -- basic integrity auditing messages. (Default)
2288 1 -- additional integrity auditing messages.
2316 could harm performance of some high-throughput
2325 1 to 9 specify maximum depth of C-state.
2334 algorithms for p-state selection. There are two
2335 P-state selection algorithms provided by
2338 on whether or not the hardware managed P-states
2345 used along with the hardware-managed P-states (HWP)
2349 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2350 instead of acpi-cpufreq may disable platform features, such
2352 P-States information being indicated to OSPM and therefore
2355 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2368 Allow per-logical-CPU P-State performance control limits using
2371 Do not enable capacity-aware scheduling (CAS) on
2374 intremap= [X86-64,Intel-IOMMU,EARLY]
2379 BIOS x2APIC opt-out request will be ignored
2422 AMD Gart HW IOMMU-specific options:
2441 Do scatter-gather (SG) merging. Implies "force"
2445 Don't do scatter-gather (SG) merging.
2458 0 - Try to allocate a 32-bit DMA address first, before
2460 1 - Allocate directly from the full usable range,
2462 greater than 32-bit addressing.
2466 0 - Lazy mode.
2472 1 - Strict mode.
2475 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2477 legacy driver-specific options takes precedence.
2482 0 - Use IOMMU translation for DMA.
2483 1 - Bypass the IOMMU for DMA.
2484 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2486 io7= [HW] IO7 for Marvel-based Alpha systems
2501 See Documentation/admin-guide/nfs/nfsroot.rst.
2537 Enables support for pseudo-NMIs in the kernel. This
2556 [Deprecated - use cpusets instead]
2557 Format: [flag-list,]<cpu-list>
2590 "number of CPUs in system - 1".
2616 The format of <cpu-list> is described above.
2620 ivrs_ioapic [HW,X86-64]
2621 Provide an override to the IOAPIC-ID<->DEVICE-ID
2625 For example, to map IOAPIC-ID decimal 10 to
2631 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2634 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2638 ivrs_hpet [HW,X86-64]
2639 Provide an override to the HPET-ID<->DEVICE-ID
2643 For example, to map HPET-ID decimal 10 to
2649 * To map HPET-ID decimal 0 to PCI device 00:14.0
2652 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2656 ivrs_acpihid [HW,X86-64]
2657 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2661 For example, to map UART-HID:UID AMD0020:0 to
2667 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2670 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2694 the kernel for non-movable allocations. The requested
2704 subsystem. Note that allocations like PTEs-from-HighMem
2712 for non-movable allocations and remaining memory is used
2723 gdb or control-c on the dbgp connection. When
2724 not using this parameter you use sysrq-g to break into
2729 or a supported polling keyboard driver (non-usb).
2758 "0" | "off" | "n" - kexec handover is disabled
2759 "1" | "on" | "y" - kexec handover is enabled
2765 ranges that can only be used for non-kernel
2776 parameter defines the size of additional per-node
2781 Configure the RouterBoard 532 series on-chip
2784 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2790 kprobe_event=[probe-list]
2792 The probe-list is a semicolon delimited list of probe
2822 execution by eliminating the write-protection faults
2849 virtualization on-demand when creating and destroying
2857 is that doing so may interfere with using out-of-tree
2884 back to huge pages. If the value is a non-zero N, KVM will
2889 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2892 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2893 a.k.a. Two-Dimensional Page Tables. Default is 1
2897 kvm-arm.mode=
2903 nvhe: Standard nVHE-based mode, without support for
2910 nested: VHE-based mode with support for nested
2918 command-line.
2922 kvm-arm.vgic_v3_group0_trap=
2923 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2926 kvm-arm.vgic_v3_group1_trap=
2927 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
2930 kvm-arm.vgic_v3_common_trap=
2934 kvm-arm.vgic_v4_enable=
2938 kvm-arm.wfe_trap_policy=
2947 kvm-arm.wfi_trap_policy=
2964 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2965 a.k.a. Two-Dimensional Page Tables. Default is 1
2969 kvm-intel.emulate_invalid_guest_state=
2971 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2977 kvm-intel.flexpriority=
2982 kvm-intel.nested=
2986 kvm-intel.unrestricted_guest=
2992 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2993 CVE-2018-3620.
3004 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
3024 on - enable the interface for the mitigation
3089 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3095 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3099 value for LAPIC timer one-shot implementation. Default
3122 libata.force= [LIBATA] Force configurations. The format is a comma-
3134 first fan-out link behind PMP device. It does not
3148 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3155 * rstonce: only attempt one reset during hot-unplug
3198 * external: Mark port as external (hotplug-capable).
3252 Specify the number of self-propagating call_rcu()
3260 occasional long-duration lock hold time. Defaults
3271 Set the number of locking read-acquisition kthreads.
3276 Set the number of locking write-acquisition kthreads.
3279 Set time (s) after boot for CPU-hotplug testing.
3282 Set time (s) between CPU-hotplug operations, or
3283 zero to disable CPU-hotplug testing.
3286 Do periodic testing of real-time lock priority
3291 non-real-time spinlocks, due to their disabling
3292 of preemption. Note that non-realtime mutexes
3305 Set task-shuffle interval (jiffies). Shuffling
3306 tasks allows some CPUs to go into dyntick-idle
3311 is useful for hands-off automated testing.
3330 Run the write-side locktorture kthreads at
3331 sched_set_fifo() real-time priority.
3349 7 (KERN_DEBUG) debug-level messages
3361 logo.nologo [FB] Disables display of the built-in Linux logo.
3379 an IEEE 1284-compliant printer is attached; if
3385 time-consuming boot-time autodetection (up to 250 ms per
3405 Example: machtype=lemote-yeeloong-2f-7inch
3417 (loop.max_loop) unconditionally pre-created at init time. The default
3420 devices can be requested on-demand with the
3421 /dev/loop-control interface.
3423 mce= [X86-{32,64}]
3460 do not opt-in to Local MCE delivery. Use legacy method
3481 don't overwrite the bios-set CMCI threshold. This boot
3490 force-enable recoverable machine check code paths
3496 See Documentation/admin-guide/md.rst.
3503 Control mitigation for the Micro-architectural Data
3518 full - Enable MDS mitigation on vulnerable CPUs
3519 full,nosmt - Enable MDS mitigation and disable
3521 off - Unconditionally disable MDS mitigation
3523 On TAA-affected machines, mds=off can be prevented by
3532 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3547 [ARC,MICROBLAZE] - the limit applies only to low memory,
3550 [ARM64] - only limits memory covered by the linear
3563 [ARM,MIPS,EARLY] - override the memory layout
3570 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3577 per-device physically contiguous DMA buffers.
3585 See Documentation/admin-guide/mm/memory-hotplug.rst.
3610 Example: Exclude memory from 0x18690000-0x1869ffff
3624 memmap=<size>%<offset>-<oldtype>+<newtype>
3626 from <oldtype> to <newtype>. If "-<oldtype>" is left
3641 repeatable BIOS-originated corruption always
3685 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3691 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3695 s2idle - Suspend-To-Idle
3696 shallow - Power-On Suspend or equivalent (if supported)
3697 deep - Suspend-To-RAM or equivalent (if supported)
3698 See Documentation/admin-guide/pm/sleep-states.rst.
3700 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3716 0 - The attached screen is the 3.5" TFT
3717 1 - The attached screen is the 7" TFT
3718 2 - The VGA Shield is attached (1024x768)
3722 b - Enable backlight. The TFT backlight pin will be
3726 c - Enable the s3c camera interface.
3727 t - Reserved for enabling touchscreen support. The
3731 https://repo.or.cz/w/linux-2.6/mini2440.git
3736 arch-independent options, each of which is an
3737 aggregation of existing arch-specific options.
3767 ssbd=force-off [ARM64]
3780 have other ways of avoiding SMT-based attacks.
3815 full - Enable mitigation on vulnerable CPUs
3817 full,nosmt - Enable mitigation and disable SMT on
3820 off - Unconditionally disable mitigation
3833 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3863 module_blacklist= [KNL] Do not load a comma-separated list of
3888 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3895 Format: <name>,<region-number>,<size>,<offset>
3898 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3937 something different and driver-specific.
3977 [NFS] enable 64-bit inode numbers.
3978 If zero, the NFS client will fake up a 32-bit inode
3980 of returning the full 64-bit number.
3981 The default is to return 64-bit inode numbers.
4016 [NFS4] Specify an additional fixed unique ident-
4047 driver. A non-zero value sets the minimum interval
4052 server-to-server copies for which this server is
4064 server-to-server copy, knfsd temporarily mounts
4071 See Documentation/admin-guide/nfs/nfsroot.rst.
4073 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
4074 See Documentation/admin-guide/nfs/nfsroot.rst.
4077 See Documentation/admin-guide/nfs/nfsroot.rst.
4081 NMI stack-backtrace request.
4090 0 - turn hardlockup detector in nmi_watchdog off
4091 1 - turn hardlockup detector in nmi_watchdog on
4092 rNNN - configure the watchdog with raw perf event 0xNNN
4105 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4109 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4110 Forces kernel to use 3-level paging instead.
4112 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4113 kernel to use 4-level paging instead.
4148 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4150 noexec32 [X86-64]
4151 This affects only 32-bit executables.
4152 noexec32=on: enable non-executable mappings (default)
4154 noexec32=off: disable non-executable mappings
4165 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4167 legacy floating-point registers on task switch.
4180 compared. However, if this command-line option is
4223 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4225 [Deprecated - use intremap=off]
4231 noirqdebug [X86-32] Disables the code which attempts to detect and
4241 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4244 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4246 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4248 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4250 nomce [X86-32] Disable Machine Check Exception
4252 nomfgpt [X86-32] Disable Multi-Function General Purpose
4258 not load if they could possibly displace the pre-
4261 perform display-mode changes or accelerated rendering.
4274 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4279 nopti [X86-64,EARLY]
4295 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4301 no-scroll [VGA] Disables scrollback.
4302 This is required for the Braillex ib80-piezo Braille
4305 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4325 nosoftlockup [KNL] Disable the soft-lockup detector.
4331 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4344 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4351 timer IRQ sources, i.e., the IO-APIC timer. This can
4356 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4369 no-vmw-sched-clock
4374 soft-lockup and NMI watchdog (hard-lockup).
4378 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4386 enabling legacy floating-point and sse state.
4408 n. So during boot up some boot time memory for per-cpu
4409 variables need be pre-allocated for later physical cpu
4436 soft-reserved memory partitioning.
4445 See Documentation/admin-guide/sysctl/vm.rst for details.
4448 See Documentation/core-api/debugging-via-ohci1394.rst for more
4463 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4467 boundary - index of last SLC block on Flex-OneNAND.
4469 lock - Configure if Flex-OneNAND boundary should be locked.
4488 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4494 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4522 See Documentation/admin-guide/tainted-kernels.rst for
4575 Set to non-zero to probe primary and secondary ISA
4581 Set to non-zero if a chip is present that snoops speed
4629 Set to non-zero to probe tertiary and further ISA
4645 Set to non-zero to probe QDI controllers. By default
4650 Set to non-zero to probe Winbond controllers. Use
4697 bios [X86-32] force use of PCI BIOS, don't access
4699 has a non-standard PCI host bridge.
4700 nobios [X86-32] disallow use of PCI BIOS, only direct
4706 data in IO port 0xCFC, both 32-bit).
4708 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4709 the function, IO port 0xCFA, also 8-bit, sets
4711 through ports 0xC000-0xCFFF).
4718 root domains (aka PCI segments, in ACPI-speak).
4726 disable the use of MSI interrupts system-wide.
4731 primary IO-APIC for bridges that cannot disable
4738 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4762 F0000h-100000h range.
4767 assign-busses [X86] Always assign all PCI bus
4788 <linux-pci@vger.kernel.org>.
4792 a bug to <linux-pci@vger.kernel.org>.
4804 bfsort Sort PCI devices into breadth-first order.
4807 nobfsort Don't sort PCI devices into breadth-first order.
4809 tuning and use the BIOS-configured MPS defaults.
4819 configuration allows peer-to-peer DMA between
4822 that hot-added devices will work.
4837 A PCI-PCI bridge can be specified if resource
4843 for 4096-byte alignment.
4845 end-to-end CRC checking). Only effective if
4876 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4907 bit-0 : ACS Source Validation
4908 bit-1 : ACS Translation Blocking
4909 bit-2 : ACS P2P Request Redirect
4910 bit-3 : ACS P2P Completion Redirect
4911 bit-4 : ACS Upstream Forwarding
4912 bit-5 : ACS P2P Egress Control
4913 bit-6 : ACS Direct Translated P2P
4923 Validation unchanged from whatever power-up
4935 system-wide.
4949 dpc-native Use native PCIe service for DPC only. May
4966 Keep all power-domains already enabled by bootloader on,
4984 pirq= [SMP,APIC] Manual mp-table setup
4985 See Documentation/arch/x86/i386/IO-APIC.rst.
4989 See also Documentation/admin-guide/parport.rst.
4995 pmu_override= [PPC] Override the PMU.
4996 This option takes over the PMU facility, so it is no
4998 PMU counters by setting MMCR0 to 0 (the FC bit is
5008 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
5017 { on | off | curr | res | no-curr | no-res }
5052 Altivec, VSX and SPE outside of regions specifically
5062 none - Limited to cond_resched() calls
5063 voluntary - Limited to cond_resched() and might_sleep() calls
5064 full - Any section that isn't explicitly preempt disabled
5068 lazy - Scheduler controlled. Similar to full but instead
5074 print-fatal-signals=
5080 coredump - etc.
5083 you might want to try "ulimit -i unlimited".
5095 or lockdep-detected issues (only if lock debug is on).
5103 Allows storing messages from non-panic CPUs into
5105 flushed to consoles by the panic-CPU on
5106 a best-effort basis.
5112 on - unlimited logging to /dev/kmsg from userspace
5113 off - logging to /dev/kmsg disabled
5114 ratelimit - ratelimit the logging
5125 - 'always': traditional behavior always allows mem overrides.
5126 - 'ptrace': only allow mem overrides for active ptracers.
5127 - 'never': never allow mem overrides.
5131 Limit processor to maximum C-state
5135 Ignore the _CST method to determine C-states,
5142 Param: "schedule" - profile schedule points.
5143 Param: "kvm" - profile VM exits.
5144 Param: <number> - step/bucket size as a power of 2 for
5175 pti= [X86-64] Control Page Table Isolation of user and
5180 on - unconditionally enable
5181 off - unconditionally disable
5182 auto - kernel detects whether your CPU model is
5188 [KNL] Number of legacy pty's. Overwrites compiled-in
5200 See Documentation/admin-guide/md.rst.
5203 See Documentation/admin-guide/blockdev/ramdisk.rst.
5222 cross-syscall address exposures. This is only
5228 ras=option[,option,...] [KNL] RAS-specific options
5234 rcu_nocbs[=cpu-list]
5239 enable the no-callback CPU mode, which prevents
5244 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5248 and real-time workloads. It can also improve
5252 list of CPUs is set to no-callback mode from boot.
5256 no-callback mode from boot but the mode may be
5267 This improves the real-time response for the
5278 Do only a one-line RCU CPU stall warning when
5279 there is an ongoing too-long CSD-lock wait.
5285 If triggered before the RCU grace-period machinery
5295 RCU grace-period cleanup.
5299 RCU grace-period initialization.
5303 RCU grace-period pre-initialization, that is,
5304 the propagation of recent CPU-hotplug changes up
5308 Set delay from grace-period initialization to
5321 soliciting quiescent-state help from
5333 Set the SCHED_FIFO priority of the RCU per-CPU
5336 and for the RCU grace-period kthreads (rcu_bh,
5338 set, valid values are 1-99 and the default is 1
5339 (the least-favored priority). Otherwise, when
5340 RCU_BOOST is not set, valid values are 0-99 and
5341 the default is zero (non-realtime operation).
5346 On callback-offloaded (rcu_nocbs) CPUs,
5349 use of the ->nocb_bypass list. However, in the
5350 common non-flooded case, RCU queues directly to
5351 the main ->cblist in order to avoid the extra
5352 overhead of the ->nocb_bypass list and its lock.
5354 a single jiffy, RCU pre-queues the callbacks into
5355 the ->nocb_bypass queue. The definition of "too
5359 On callback-offloaded (rcu_nocbs) CPUs, avoid
5372 batch limiting is re-enabled.
5376 RCU's force-quiescent-state scan will aggressively
5384 Set the page-cache refill delay (in milliseconds)
5385 in response to low-memory conditions. The range
5389 Set the shift-right count to use to compute
5390 the callback-invocation batch limit bl from
5397 Please note that this callback-invocation batch
5398 limit applies only to non-offloaded callback
5407 cache-to-cache transfer latencies.
5413 and for NUMA systems with large remote-access
5429 the wakeup overhead on the global grace-period
5431 each group's NOCB grace-period kthread.
5434 Cause the grace-period kthread to get an extra
5436 it should at force-quiescent-state time.
5449 this specifies an rcu_read_unlock()-time delay
5453 of RCU-protected pointers after the relevant
5463 per-CPU rcuc kthreads. Defaults to a non-zero
5492 grace-period primitives such as call_rcu().
5503 grace-period primitives.
5506 Set test-start holdoff period. The purpose of
5524 Test the double-argument variant of kfree_rcu().
5526 rcuscale.kfree_rcu_test_single, both the single-
5527 and double-argument variants are tested.
5530 Test the single-argument variant of kfree_rcu().
5532 rcuscale.kfree_rcu_test_double, both the single-
5533 and double-argument variants are tested.
5547 does not affect the data-collection interval,
5552 Set number of RCU readers. The value -1 selects
5554 "n" less than -1 selects N-n+1, where N is again
5555 the number of CPUs. For example, -2 selects N
5556 (the number of CPUs), -3 selects N+1, and so on.
5557 A value of "n" less than or equal to -N selects
5570 complete. This is useful for hands-off automated
5577 Write-side holdoff between grace periods,
5582 Additional write-side holdoff between grace
5600 for RCU grace-period forward-progress testing
5607 Specify the fraction of a CPU-stall-warning
5608 period to do tight-loop forward-progress testing.
5612 forward-progress tests.
5616 need_resched() during tight-loop forward-progress
5620 Use conditional/asynchronous update-side
5621 normal-grace-period primitives, if available.
5624 Use conditional/asynchronous update-side
5625 expedited-grace-period primitives, if available.
5628 Use conditional/asynchronous update-side
5629 normal-grace-period primitives that also take
5634 Use conditional/asynchronous update-side
5635 expedited-grace-period primitives that also take
5659 Use expedited update-side primitives, if available.
5662 Use normal (non-expedited) asynchronous
5663 update-side primitives, if available.
5666 Use polled update-side normal-grace-period
5670 Use polled update-side expedited-grace-period
5674 Use polled update-side normal-grace-period
5679 Use polled update-side expedited-grace-period
5703 Use normal (non-expedited) synchronous
5704 update-side primitives, if available. If all
5708 they are all non-zero.
5711 Enable grace-period wrap lag testing. Setting
5716 Set the value for grace-period wrap lag during
5731 the grace-period wrap lag will be set to the
5741 Leak an RCU-protected pointer out of the reader.
5756 Set number of RCU callback-offload togglers.
5761 callback-offload toggling attempts.
5764 Set number of RCU readers. The value -1 selects
5765 N-1, where N is the number of CPUs. A value
5766 "n" less than -1 selects N-n-2, where N is again
5767 the number of CPUs. For example, -2 selects N
5768 (the number of CPUs), -3 selects N+1, and so on.
5771 Enable debug-object double-call_rcu() testing.
5774 Set time (s) after boot for CPU-hotplug testing.
5777 Set time (jiffies) between CPU-hotplug operations,
5778 or zero to disable CPU-hotplug testing.
5782 by a high-priority FIFO real-time task. Set to
5791 second) between preemptions by a high-priority
5792 FIFO real-time task. This delay is mediated
5797 The number of times in a given read-then-exit
5798 episode that a set of read-then-exit kthreads
5803 read-then-exit testing episodes.
5808 are entered from low-order bit up, and are
5810 0x1 bit is normal readers, 0x2 NMI-safe readers,
5811 and 0x4 light-weight readers.
5814 Set task-shuffle interval (s). Shuffling tasks
5815 allows some CPUs to go into dyntick-idle mode
5820 is useful for hands-off automated testing.
5829 any other stall-related activity. Note that
5835 in scheduling-while-atomic splats.
5854 grace-period kthread to test RCU CPU stall
5878 of RCU priority-boost testing. Defaults to zero,
5885 Test RCU's dyntick-idle handling. See also the
5940 Use expedited grace-period primitives, for
5944 real-time latency, and degrade energy efficiency.
5948 Use only normal grace-period primitives,
5951 real-time latency, CPU utilization, and
5953 increased grace-period latency. This parameter
5960 only normal grace-period primitives. No effect
5966 post-boot attempt at an expedited RCU grace
5967 period to instead use normal non-expedited
5968 grace-period processing.
5976 set to the default value of -1.
5979 Set the minimum number of callback-queuing-time
5980 lock-contention events per jiffy required to
5981 cause the RCU Tasks flavors to switch to per-CPU
5984 the default value of -1.
5989 of -1 allows this to be automatically (and
5997 number avoids disturbing real-time workloads,
6002 cancel laziness on that CPU. Use -1 to disable
6012 only printed prior to the stall-warning message
6060 force - Override the decision by the kernel to hide the
6099 There are some built-in platform specific "quirks"
6100 - you may see: "reboot: <name> series board detected.
6104 built-in quirk table, and use the generic default
6137 Set test-start holdoff period. The purpose of
6152 but the default has already reduced the per-pass
6157 Set number of readers. The default value of -1
6166 Set the read-side critical-section duration,
6170 Specify the read-protection implementation to test.
6196 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6226 reservetop= [X86-32,EARLY]
6243 See Documentation/power/swsusp-and-swap-files.rst
6259 AMD-based UNRET and IBPB mitigations alone do not stop
6261 sibling threads. For that reason, STIBP is used on pro-
6265 off - no mitigation
6266 auto - automatically select a migitation
6267 auto,nosmt - automatically select a mitigation,
6271 ibpb - On AMD, mitigate short speculation
6276 ibpb,nosmt - Like "ibpb" above but will disable SMT
6280 unret - Force enable untrained return thunks,
6281 only effective on AMD f15h-f17h based
6283 unret,nosmt - Like unret, but will disable SMT when STIBP
6315 ro [KNL] Mount root device read-only on boot
6318 on Mark read-only kernel memory as read-only (default).
6319 off Leave read-only kernel memory writable for debugging.
6320 full Mark read-only kernel memory and aliases as read-only
6327 debug-uart get routed to the D+ and D- pins of the usb
6333 block/early-lookup.c for details.
6363 rw [KNL] Mount root device read-write on boot
6417 to 10 seconds for built-in smp_call_function()
6424 that requesting even small non-zero numbers of
6431 The default of -1 specifies a number of kthreads
6436 test before initiating CPU-hotplug operations.
6440 CPU-hotplug operations. Specifying zero (which
6441 is the default) disables CPU-hotplug operations.
6447 Non-zero values are useful for automated tests.
6470 "wait" parameter. A value of -1 selects the
6471 default if all other weights are -1. However,
6473 value of -1 will instead select a weight of zero.
6478 non-zero "wait" parameter. See weight_single.
6491 non-zero "wait" parameter. See weight_single
6503 non-zero "wait" parameter. See weight_single
6514 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6515 1 -- enable.
6526 0 -- disable.
6527 1 -- enable.
6530 serialnumber [BUGS=X86-32]
6532 sev=option[,option...] [X86-64]
6538 Do not enable SEV-SNP (applies to host/hypervisor
6541 SEV-SNP guests.
6549 to set it to "all" by meaning -- no limit here.
6630 using the csdlock_debug- kernel parameter.
6635 system. By default, let CSD-lock acquisition
6637 for this value provides a 5-minute timeout.
6639 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6640 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6641 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6642 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6643 smsc-ircc2.ircc_irq= [HW] IRQ line
6644 smsc-ircc2.ircc_dma= [HW] DMA channel
6645 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6655 Default: -1 (no limit)
6658 [KNL] Should the soft-lockup detector generate panics.
6661 A value of 1 instructs the soft-lockup detector
6662 to panic the machine when a soft-lockup occurs. It is
6665 respective build-time switch to that functionality.
6668 [KNL] Should the soft-lockup detector generate
6673 See Documentation/admin-guide/laptops/sonypi.rst
6680 on - (default) Enable the HW or SW mitigation as
6683 vmexit - On systems which don't have the HW mitigation
6686 protected from VM-originated BHI attacks, but
6688 off - Disable the mitigation.
6695 on - unconditionally enable, implies
6697 off - unconditionally disable, implies
6699 auto - kernel detects whether your CPU model is
6718 retpoline - replace indirect branches
6719 retpoline,generic - Retpolines
6720 retpoline,lfence - LFENCE; indirect branch
6721 retpoline,amd - alias for retpoline,lfence
6722 eibrs - Enhanced/Auto IBRS
6723 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6724 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6725 ibrs - use IBRS to protect kernel
6735 on - Unconditionally enable mitigations. Is
6738 off - Unconditionally disable mitigations. Is
6741 prctl - Indirect branch speculation is enabled,
6747 - Like "prctl" above, but only STIBP is
6753 - Same as "prctl" above, but all seccomp
6758 - Like "seccomp" above, but only STIBP is
6763 auto - Kernel selects the mitigation depending on
6774 off - Disable mitigation
6775 microcode - Enable microcode mitigation only
6776 safe-ret - Enable sw-only safe RET mitigation (default)
6777 ibpb - Enable mitigation by issuing IBPB on
6779 ibpb-vmexit - Issue IBPB only on VMEXIT
6780 (cloud-specific mitigation)
6805 on - Unconditionally disable Speculative Store Bypass
6806 off - Unconditionally enable Speculative Store Bypass
6807 auto - Kernel detects whether the CPU model contains an
6813 prctl - Control Speculative Store Bypass per thread
6817 seccomp - Same as "prctl" above, but all seccomp threads
6825 on,auto - On Power8 and Power9 insert a store-forwarding
6829 off - No action.
6843 off - not enabled
6845 warn - the kernel will emit rate-limited warnings
6853 fatal - the kernel will send SIGBUS to applications
6858 ratelimit:N -
6878 Certain CPUs are vulnerable to an MDS-like
6898 This kernel-boot parameter defaults to 128,
6899 but takes effect only when the low-order four
6916 instead of the compile-time CONFIG_NR_CPUS.
6920 grace-period sequence counter wrap for the
6921 srcu_data structure's ->srcu_gp_seq_needed field.
6936 Specifies the number of no-delay instances
6943 Specifies the per-grace-period phase, number of
6944 non-sleeping polls of readers. Beyond this limit,
6950 Specifies number of microseconds of non-sleeping
6951 delay between each non-sleeping poll of readers.
6954 Specifies the number of update-side contention
6959 set for contention-based conversions to occur.
6969 force-on: Unconditionally enable mitigation for
6971 force-off: Unconditionally disable mitigation for
6994 stacktrace_filter=[function-list]
6996 will trace at boot up. function-list is a comma-separated
7004 Set the STI (builtin display/keyboard on the HP-PARISC
7006 as the initial boot-console.
7066 to global on non-NUMA machines)
7091 <int> -- Number of I/O TLB slabs
7092 <int> -- Second integer after comma. Number of swiotlb
7095 force -- force using of bounce buffers even if they
7097 noforce -- Never use bounce buffers (for debugging)
7112 Ignore sysrq setting - this boot parameter will
7120 cache size. See Documentation/networking/ip-sysctl.rst
7127 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7132 wakeup-capable RTC alarm.
7138 -1: disable all active trip points in all thermal zones
7142 -1: disable all critical trip points in all thermal zones
7149 -1: disable all passive trip points
7155 <deci-seconds>: poll all this frequency
7159 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7164 See Documentation/admin-guide/mm/transhuge.rst for more
7172 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7178 See Documentation/admin-guide/mm/transhuge.rst for more
7190 Prevent the CPU-hotplug component of torturing
7194 Dump the ftrace buffer at torture-test shutdown,
7198 with rotating-rust storage.
7203 disables verbose-printk() sleeping.
7206 Duration of each verbose-printk() sleep in jiffies.
7231 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7269 local - Use the per CPU time stamp counter
7273 global - Event time stamps are synchronize across
7276 counter - Simple counting of events (1, 2, ..)
7280 uptime - Use jiffies as the time stamp.
7281 perf - Use the same clock that perf uses.
7282 mono - Use ktime_get_mono_fast_ns() for time stamps.
7283 mono_raw - Use ktime_get_raw_fast_ns() for time
7285 boot - Use ktime_get_boot_fast_ns() for time stamps.
7289 trace_event=[event-list]
7291 to facilitate early boot debugging. The event-list is a
7292 comma-separated list of trace events to enable. See
7303 trace_instance=[instance-info]
7328 traceoff - Have the tracing instance tracing disabled after it is created.
7329 traceprintk - Have trace_printk() write into this trace instance
7376 trace_options=[option-list]
7378 The option-list is a comma delimited list of options
7392 trace_trigger=[trigger-list]
7438 See Documentation/admin-guide/mm/transhuge.rst
7445 See Documentation/admin-guide/mm/transhuge.rst
7452 See Documentation/admin-guide/mm/transhuge.rst
7460 - "tpm"
7461 - "tee"
7462 - "caam"
7463 - "dcp"
7473 - "kernel"
7474 - the same value as trusted.source: "tpm" or "tee"
7475 - "default"
7496 high-resolution timer mode on older hardware, and in
7532 on - Enable TSX on the system. Although there are
7535 several previous speculation-related CVEs, and
7539 off - Disable TSX on the system. (Note that this
7547 auto - Disable TSX if X86_BUG_TAA is present,
7552 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7558 Similar to Micro-architectural Data Sampling (MDS)
7573 full - Enable TAA mitigation on vulnerable CPUs
7576 full,nosmt - Enable TAA mitigation and disable SMT on
7579 vulnerable to cross-thread TAA attacks.
7580 off - Unconditionally disable TAA mitigation
7582 On MDS-affected machines, tsx_async_abort=off can be
7594 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7600 See also Documentation/input/devices/joystick-parport.rst
7602 udbg-immortal [PPC] When debugging early kernel crashes that
7608 Set number of hash buckets for UDP/UDP-Lite connections
7610 uhci-hcd.ignore_oc=
7612 Some badly-designed motherboards generate lots of
7637 unwind_debug [X86-64,EARLY]
7645 (default -1 = authorized (same as 1),
7651 for newly-detected USB devices (default 2). This
7679 [USB] Specifies timeout for the initial 64-byte
7686 [USB] A list of quirk entries to augment the built-in
7689 VendorID:ProductID:Flags. The IDs are 4-digit hex
7691 will change the built-in quirk; setting it if it is
7696 a 255-byte read);
7700 Set-Interface requests);
7719 (bInterval-1).
7757 usb-storage.delay_use=
7764 usb-storage.quirks=
7766 override the built-in unusual_devs list. List
7769 and Product ID values (4-digit hex numbers) and
7771 to a common usb-storage quirk flag as follows:
7813 medium is write-protected).
7822 1 - undefined instruction events
7823 2 - system calls
7824 4 - invalid data aborts
7825 8 - SIGSEGV faults
7826 16 - SIGBUS faults
7835 vdso32= [X86] Control the 32-bit vDSO
7836 vdso32=1: enable 32-bit VDSO
7837 vdso32=0 or vdso32=2: disable 32-bit VDSO
7847 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7878 vga= [BOOT,X86-32] Select a particular video mode
7880 Documentation/admin-guide/svga.rst.
7895 - Disable all of the above options
7919 vsyscall= [X86-64,EARLY]
7922 code). Most statically-linked binaries and older
7946 see vga-softcursor.rst. Default: 2 = underline.
7951 This is a 16-member array composed of values
7952 ranging from 0-255.
7957 This is a 16-member array composed of values
7958 ranging from 0-255.
7963 This is a 16-member array composed of values
7964 ranging from 0-255.
7969 Set system-wide default UTF-8 mode for all tty's.
7970 Default is 1, i.e. UTF-8 mode is enabled for all
7975 Format=<-1|0|1>
7976 Set system-wide default for whether a cursor
7977 is shown on new VTs. Default is -1,
7982 vt.italic= [VT] Default color for italic text; 0-15.
7985 vt.underline= [VT] Default color for underlined text; 0-15.
7989 see Documentation/watchdog/watchdog-parameters.rst
7990 or other driver-specific files in the
8004 Format: <cpu-list>
8025 Per-cpu work items which run for longer than this
8028 them from noticeably delaying other per-cpu work
8046 Per-cpu workqueues are generally preferred because
8048 locality; unfortunately, per-cpu workqueues tend to
8051 Enabling this makes the per-cpu workqueues which
8065 Documentation/core-api/workqueue.rst.
8078 forces round-robin CPU selection to flush out
8086 on - Enable writecombine, use WUC for ioremap_wc()
8087 off - Disable writecombine, use SUC for ioremap_wc()
8089 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
8093 xen_512gb_limit [KNL,X86-64,XEN]
8103 ide-disks -- unplug primary master IDE devices
8104 aux-ide-disks -- unplug non-primary-master IDE devices
8105 nics -- unplug network devices
8106 all -- unplug all emulated devices (NICs and IDE disks)
8107 unnecessary -- unplugging emulated devices is
8110 never -- do not unplug even if version check succeeds
8124 Select whether to always use non-faulting (safe) MSR
8144 xen_timer_slop= [X86-64,XEN,EARLY]
8169 preferred over the 2-level event handling, as it is
8186 xive.store-eoi=off [PPC]
8192 xhci-hcd.quirks [USB,KNL]