Lines Matching +full:restricted +full:- +full:dma +full:- +full:pool
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
58 Documentation/firmware-guide/acpi/debug.rst for more information about
116 Format: <byte> or <bitmap-list>
119 Disable auto-serialization of AML methods
122 auto-serialization feature.
140 Ignore the ACPI-based watchdog interface (WDAT) and let
161 acpi_osi=! # disable all built-in OS vendor
163 acpi_osi=!! # enable all built-in OS vendor
225 For broken nForce2 BIOS resulting in XT-PIC timer.
234 as soon as the kernel's real-mode entry point is called.
272 See Documentation/sound/alsa-configuration.rst
279 align_va_addr= [X86-64]
284 CPU-intensive style benchmark, and it can vary highly in
287 32: only for 32-bit processes
288 64: only for 64-bit processes
289 on: enable for both 32- and 64-bit processes
290 off: disable for both 32- and 64-bit processes
300 Allow execve() of 32-bit applications and setting of the
302 subset of the CPUs support 32-bit EL0. When this
303 parameter is present, the set of CPUs supporting 32-bit
305 and hot-unplug operations may be restricted.
307 See Documentation/arch/arm64/asymmetric-32bit.rst for more
310 amd_iommu= [HW,X86-64]
313 fullflush - Deprecated, equivalent to iommu.strict=1
314 off - do not initialize any AMD IOMMU found in
316 force_isolation - Force device isolation for all
321 force_enable - Force enable the IOMMU on platforms known
324 pgtbl_v1 - Use v1 page table for DMA-API (Default).
325 pgtbl_v2 - Use v2 page table for DMA-API.
326 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
328 amd_iommu_dump= [HW,X86-64]
334 amd_iommu_intr= [HW,X86-64]
337 legacy - Use legacy interrupt remapping mode.
338 vapic - Use virtual APIC mode, which allows IOMMU
340 This mode requires kvm-amd.avic=1.
377 Power management functions (SPARCstation-4/5 + deriv.)
379 Disable APC CPU standby support. SPARCstation-Fox does
380 not play well with APC CPU idle - disable it if you have
387 when initialising the APIC and IO-APIC components.
388 For X86-32, this can also be used to specify an APIC
411 0 -- disable.
412 1 -- enable.
415 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
457 audit= [KNL] Enable the audit sub-system
459 0 | off - kernel audit is disabled and can not be
461 unset - kernel audit is initialized but disabled and
463 1 | on - kernel audit is initialized and partially
476 0 - Disable the BAU.
477 1 - Enable the BAU.
478 unset - Disable the BAU.
505 See Documentation/block/cmdline-partition.rst
518 See Documentation/admin-guide/bootconfig.rst
523 bttv.pll= See Documentation/admin-guide/media/bttv.rst
532 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
551 inclusive. See arch/mips/include/asm/pgtable-bits.h
561 - foo isn't auto-mounted if you mount all cgroups in
563 - foo isn't visible as an individually mountable
565 - if foo is an optional feature then the feature is
571 Specifying "pressure" disables per-cgroup pressure
585 nosocket -- Disable socket memory accounting.
586 nokmem -- Disable kernel memory accounting.
587 nobpf -- Disable BPF memory accounting.
592 0 -- check protection applied by kernel (includes
594 1 -- check protection requested by application.
606 numbers X. Note the Linux-specific bits are not necessarily
607 stable over kernel options, but the vendor-specific
627 force such clocks to be always-on nor does it reserve
631 information, see Documentation/driver-api/clk.rst.
633 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
650 [X86-32] pit,hpet,tsc;
657 [X86-64] hpet,tsc
663 architected timer so that code using WFE-based polling
677 clocksource-wdtest.holdoff= [KNL]
683 cma=nn[MG]@[start[MG][-end[MG]]]
690 kernel/dma/contiguous.c
694 Sets the size of kernel per-numa memory area for
696 per-numa CMA altogether. And If this option is not
698 With per-numa CMA enabled, DMA users on node nid will
709 With numa CMA enabled, DMA users on node nid will
722 Sets the size of memory pool for coherent, atomic dma
725 com20020= [HW,NET] ARCnet - COM20020 chipset
729 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
733 ARCnet - COM90xx chipset (memory-mapped buffers)
762 See Documentation/admin-guide/serial-console.rst for more
772 Start an early, polled-mode console on the 8250/16550
775 MMIO inter-register address stride is either 8-bit
776 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
780 the h/w is not re-initialized.
807 syscall, or to executing "dmesg -S --raw" or to reading
831 disable the cpuidle sub-system
837 disable the cpufreq sub-system
845 [X86] Delay for N microsec between assert and de-assert
857 Run kdump after running panic-notifiers and dumping
870 [KNL, X86-64, ARM64, RISCV] Select a region under 4G first, and
873 See Documentation/admin-guide/kdump/kdump.rst for further details.
878 start-[end] where start and end are both
880 Documentation/admin-guide/kdump/kdump.rst for an example.
883 [KNL, X86-64, ARM64, RISCV] range could be above 4G.
890 [KNL, X86-64, ARM64, RISCV] range under 4G. When crashkernel=X,high
895 low memory is needed to make sure DMA buffers for 32-bit
899 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
900 --> arm64: 128MiB
901 --> riscv: 128MiB
909 [KNL] Disable crypto self-tests
912 Format: <dma>
917 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
932 See also Documentation/input/devices/joystick-parport.rst
945 [KNL] verbose locking self-tests
948 self-tests.
950 (no extra messages), setting it to -1 (all bits set)
951 will print _a_lot_ more information - normally only
969 F/W or by drivers badly programming DMA (basically when
986 Format: { on, no-mount, off }
988 no-mount:
993 get a -EPERM as result when trying to register files
997 Default value is set in build-time with a kernel configuration.
1009 Documentation/admin-guide/mm/hugetlbpage.rst.
1023 delayacct [KNL] Enable per-task delay accounting
1039 dell_smm_hwmon.restricted=
1090 Disable Dynamic DMA Window support. Use this
1103 memory out of your available memory pool based on
1118 entries for DMA-API debugging code. One entry is
1119 required per DMA-API allocation. Use this if the
1120 DMA-API debugging code disables itself because the
1124 With this option the DMA-API debugging driver
1148 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1162 Generic built-in EDID data sets are used, if one of
1167 available in Documentation/admin-guide/edid.rst. An EDID
1179 Control how the dt_cpu_ftrs device-tree binding is
1189 what data is available or for reverse-engineering.
1194 Documentation/admin-guide/dynamic-debug-howto.rst
1205 determined by stdout-path property in device tree's
1210 Start an early, polled-mode console on a Cadence
1221 Start an early, polled-mode console on the 8250/16550
1223 MMIO inter-register address stride is either 8-bit
1224 (mmio) or 32-bit (mmio32 or mmio32be).
1234 Start an early, polled-mode console on a pl011 serial
1238 the driver will use only 32-bit accessors to read/write
1247 Start an early, polled-mode console on a meson serial
1253 Start an early, polled-mode console on an msm serial
1259 Start an early, polled-mode console on an msm serial
1265 Start an early, polled-mode console on a serial port
1271 Start an early, polled-mode console on a serial port
1277 Use RISC-V SBI (Supervisor Binary Interface) for early
1295 Start an early, polled-mode console on a lantiq serial
1309 Start an early, polled-mode, output-only console on the
1314 Start an early, polled-mode console on the
1320 Start an early, polled-mode console on a Qualcomm
1328 coherent non-x86 systems that use system memory for
1428 attribute is added to range 0x100000000-0x180000000 and
1429 0x10a0000000-0x1120000000.
1433 range 0x240000000-0x43fffffff.
1445 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1462 elanfreq= [X86-32]
1470 See Documentation/admin-guide/kdump/kdump.rst for details.
1486 0 -- permissive (log only, no denials).
1487 1 -- enforcing (deny and log).
1519 See also Documentation/fault-injection/.
1523 See Documentation/admin-guide/sysctl/net.rst for
1527 See Documentation/admin-guide/blockdev/floppy.rst.
1530 [IA-64] Avoid check_sal_cache_flush which may hang on
1535 forcepae [X86-32]
1571 ftrace_filter=[function-list]
1573 tracer at boot up. function-list is a comma-separated
1578 ftrace_notrace=[function-list]
1580 function-list. This list can be changed at run time
1584 ftrace_graph_filter=[function-list]
1587 function-list is a comma-separated list of functions
1591 ftrace_graph_notrace=[function-list]
1593 function-list. This list is a comma-separated list of
1613 off -- Don't create device links from firmware info.
1614 permissive -- Create device links from firmware info
1617 on -- Create device links from firmware info and use it
1619 rpm -- Like "on", but also use to order runtime PM.
1632 strict -- Default. Continue waiting on consumers to
1634 timeout -- Give up waiting on consumers and call
1644 See also Documentation/input/devices/joystick-parport.rst
1648 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1672 gcov_persist= [GCOV] When non-zero (default), profiling data for
1682 gpio-mockup.gpio_mockup_ranges
1685 gpio-mockup.gpio_mockup_named_lines
1717 against bounds-checking flaws in the kernel's
1723 [KNL] Should the hard-lockup detector generate
1729 for 64-bit NUMA, off otherwise.
1732 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1739 corresponding firmware-first mode error processing
1749 during restoration read-only).
1775 hpet= [X86-32,HPET] option to control HPET usage
1792 number of pages to allocate per-node can be specified.
1793 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1804 Documentation/admin-guide/mm/hugetlbpage.rst.
1815 boot-time allocation of gigantic hugepages is skipped.
1843 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1849 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1866 (disabled by default, and as a pre-condition
1868 i8042.direct [HW] Put keyboard port into non-translated mode
1882 suspend-to-ram transitions, only during s2r
1906 -1 -- never invert brightness
1907 0 -- machine default
1908 1 -- force brightness inversion
1922 idle=nomwait: Disable mwait for CPU C-states
1950 legacy only accept legacy-NaN binaries, if supported
1952 2008 only accept 2008-NaN binaries, if supported
1961 'relaxed' straps the emulator for both legacy-NaN and
1962 2008-NaN, whereas 'strict' enables legacy-NaN only on
1971 Ignore loglevel setting - this will print /all/
2038 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2039 "ima-sigv2" }
2040 Default: "ima-ng"
2073 stuff: Deploy RSB-fill mitigation when retpoline is
2078 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2089 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2090 initcall functions. Useful for debugging built-in
2135 0 -- basic integrity auditing messages. (Default)
2136 1 -- additional integrity auditing messages.
2148 DMA.
2164 could harm performance of some high-throughput
2169 vulnerable to DMA attacks.
2173 1 to 9 specify maximum depth of C-state.
2182 algorithms for p-state selection. There are two
2183 P-state selection algorithms provided by
2186 on whether or not the hardware managed P-states
2193 used along with the hardware-managed P-states (HWP)
2197 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2198 instead of acpi-cpufreq may disable platform features, such
2200 P-States information being indicated to OSPM and therefore
2203 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2216 Allow per-logical-CPU P-State performance control limits using
2219 intremap= [X86-64, Intel-IOMMU]
2224 BIOS x2APIC opt-out request will be ignored
2248 0 - Try to allocate a 32-bit DMA address first, before
2250 1 - Allocate directly from the full usable range,
2252 greater than 32-bit addressing.
2256 0 - Lazy mode.
2257 Request that DMA unmap operations use deferred
2262 1 - Strict mode.
2263 DMA unmap operations invalidate IOMMU hardware TLBs
2265 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2267 legacy driver-specific options takes precedence.
2270 [ARM64, X86] Configure DMA to bypass the IOMMU by default.
2272 0 - Use IOMMU translation for DMA.
2273 1 - Bypass the IOMMU for DMA.
2274 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2276 io7= [HW] IO7 for Marvel-based Alpha systems
2291 See Documentation/admin-guide/nfs/nfsroot.rst.
2315 Enables support for pseudo-NMIs in the kernel. This
2334 [Deprecated - use cpusets instead]
2335 Format: [flag-list,]<cpu-list>
2366 "number of CPUs in system - 1".
2392 The format of <cpu-list> is described above.
2396 ivrs_ioapic [HW,X86-64]
2397 Provide an override to the IOAPIC-ID<->DEVICE-ID
2401 For example, to map IOAPIC-ID decimal 10 to
2407 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2410 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2414 ivrs_hpet [HW,X86-64]
2415 Provide an override to the HPET-ID<->DEVICE-ID
2419 For example, to map HPET-ID decimal 10 to
2425 * To map HPET-ID decimal 0 to PCI device 00:14.0
2428 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2432 ivrs_acpihid [HW,X86-64]
2433 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2437 For example, to map UART-HID:UID AMD0020:0 to
2443 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2446 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2467 kernelcore= [KNL,X86,IA-64,PPC]
2470 the kernel for non-movable allocations. The requested
2480 subsystem. Note that allocations like PTEs-from-HighMem
2488 for non-movable allocations and remaining memory is used
2499 gdb or control-c on the dbgp connection. When
2500 not using this parameter you use sysrq-g to break into
2505 or a supported polling keyboard driver (non-usb).
2532 Configure the RouterBoard 532 series on-chip
2535 kmemleak= [KNL] Boot-time kmemleak enable/disable
2541 kprobe_event=[probe-list]
2543 The probe-list is a semicolon delimited list of probe
2573 execution by eliminating the write-protection faults
2618 back to huge pages. If the value is a non-zero N, KVM will
2623 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2626 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2627 a.k.a. Two-Dimensional Page Tables. Default is 1
2631 kvm-arm.mode=
2636 nvhe: Standard nVHE-based mode, without support for
2639 protected: nVHE-based mode with support for guests whose
2642 nested: VHE-based mode with support for nested
2651 kvm-arm.vgic_v3_group0_trap=
2652 [KVM,ARM] Trap guest accesses to GICv3 group-0
2655 kvm-arm.vgic_v3_group1_trap=
2656 [KVM,ARM] Trap guest accesses to GICv3 group-1
2659 kvm-arm.vgic_v3_common_trap=
2663 kvm-arm.vgic_v4_enable=
2675 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2676 a.k.a. Two-Dimensional Page Tables. Default is 1
2680 kvm-intel.emulate_invalid_guest_state=
2682 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2688 kvm-intel.flexpriority=
2693 kvm-intel.nested=
2697 kvm-intel.unrestricted_guest=
2703 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2704 CVE-2018-3620.
2715 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2735 on - enable the interface for the mitigation
2800 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2806 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2810 value for LAPIC timer one-shot implementation. Default
2817 libata.dma= [LIBATA] DMA control
2818 libata.dma=0 Disable all PATA and SATA DMA
2819 libata.dma=1 PATA and SATA Disk DMA only
2820 libata.dma=2 ATAPI (CDROM) DMA only
2821 libata.dma=4 Compact Flash DMA only
2822 Combinations also work, so libata.dma=3 enables DMA
2833 libata.force= [LIBATA] Force configurations. The format is a comma-
2845 first fan-out link behind PMP device. It does not
2859 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2866 * rstonce: only attempt one reset during hot-unplug
2885 * [no]dma: Turn on or off DMA transfers.
2889 * atapi_mod16_dma: Enable the use of ATAPI DMA for
2893 READ LOG DMA EXT command to access logs.
2948 Set the number of locking read-acquisition kthreads.
2953 Set the number of locking write-acquisition kthreads.
2956 Set time (s) after boot for CPU-hotplug testing.
2959 Set time (s) between CPU-hotplug operations, or
2960 zero to disable CPU-hotplug testing.
2963 Set task-shuffle interval (jiffies). Shuffling
2964 tasks allows some CPUs to go into dyntick-idle
2969 is useful for hands-off automated testing.
2985 Run the write-side locktorture kthreads at
2986 sched_set_fifo() real-time priority.
3006 7 (KERN_DEBUG) debug-level messages
3016 logo.nologo [FB] Disables display of the built-in Linux logo.
3034 an IEEE 1284-compliant printer is attached; if
3040 time-consuming boot-time autodetection (up to 250 ms per
3053 Format: <io>,<irq>,<dma>
3061 machvec= [IA-64] Force the use of a particular machine-vector
3067 Example: machtype=lemote-yeeloong-2f-7inch
3069 max_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory greater
3082 (loop.max_loop) unconditionally pre-created at init time. The default
3085 devices can be requested on-demand with the
3086 /dev/loop-control interface.
3088 mce [X86-32] Machine Check Exception
3090 mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
3093 See Documentation/admin-guide/md.rst.
3100 Control mitigation for the Micro-architectural Data
3115 full - Enable MDS mitigation on vulnerable CPUs
3116 full,nosmt - Enable MDS mitigation and disable
3118 off - Unconditionally disable MDS mitigation
3120 On TAA-affected machines, mds=off can be prevented by
3129 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3143 [ARC,MICROBLAZE] - the limit applies only to low memory,
3146 [ARM64] - only limits memory covered by the linear
3159 [ARM,MIPS] - override the memory layout reported by
3166 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3173 per-device physically contiguous DMA buffers.
3181 See Documentation/admin-guide/mm/memory-hotplug.rst.
3206 Example: Exclude memory from 0x18690000-0x1869ffff
3220 memmap=<size>%<offset>-<oldtype>+<newtype>
3222 from <oldtype> to <newtype>. If "-<oldtype>" is left
3237 repeatable BIOS-originated corruption always
3281 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3287 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3291 s2idle - Suspend-To-Idle
3292 shallow - Power-On Suspend or equivalent (if supported)
3293 deep - Suspend-To-RAM or equivalent (if supported)
3294 See Documentation/admin-guide/pm/sleep-states.rst.
3296 mfgpt_irq= [IA-32] Specify the IRQ to use for the
3297 Multi-Function General Purpose Timers on AMD Geode
3300 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3312 min_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory below this
3319 0 - The attached screen is the 3.5" TFT
3320 1 - The attached screen is the 7" TFT
3321 2 - The VGA Shield is attached (1024x768)
3325 b - Enable backlight. The TFT backlight pin will be
3329 c - Enable the s3c camera interface.
3330 t - Reserved for enabling touchscreen support. The
3334 https://repo.or.cz/w/linux-2.6/mini2440.git
3339 arch-independent options, each of which is an
3340 aggregation of existing arch-specific options.
3369 ssbd=force-off [ARM64]
3382 have other ways of avoiding SMT-based attacks.
3417 full - Enable mitigation on vulnerable CPUs
3419 full,nosmt - Enable mitigation and disable SMT on
3422 off - Unconditionally disable mitigation
3435 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3465 module_blacklist= [KNL] Do not load a comma-separated list of
3479 movablecore= [KNL,X86,IA-64,PPC]
3490 movable_node [KNL] Boot-time switch to make hotplugable memory
3497 Format: <name>,<region-number>,<size>,<offset>
3500 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3508 See arch/arm/mach-s3c/mach-jive.c
3544 something different and driver-specific.
3577 [NFS] enable 64-bit inode numbers.
3578 If zero, the NFS client will fake up a 32-bit inode
3580 of returning the full 64-bit number.
3581 The default is to return 64-bit inode numbers.
3616 [NFS4] Specify an additional fixed unique ident-
3647 driver. A non-zero value sets the minimum interval
3652 server-to-server copies for which this server is
3664 server-to-server copy, knfsd temporarily mounts
3671 See Documentation/admin-guide/nfs/nfsroot.rst.
3673 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3674 See Documentation/admin-guide/nfs/nfsroot.rst.
3677 See Documentation/admin-guide/nfs/nfsroot.rst.
3681 NMI stack-backtrace request.
3690 0 - turn hardlockup detector in nmi_watchdog off
3691 1 - turn hardlockup detector in nmi_watchdog on
3703 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3707 no4lvl [RISCV] Disable 4-level and 5-level paging modes. Forces
3708 kernel to use 3-level paging instead.
3710 no5lvl [X86-64,RISCV] Disable 5-level paging mode. Forces
3711 kernel to use 4-level paging instead.
3714 caches in the slab allocator. Saves per-node memory,
3751 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3753 noexec [IA-64]
3755 noexec32 [X86-64]
3756 This affects only 32-bit executables.
3757 noexec32=on: enable non-executable mappings (default)
3759 noexec32=off: disable non-executable mappings
3770 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3772 legacy floating-point registers on task switch.
3774 nohalt [IA-64] Tells the kernel not to use the power saving
3776 power-consumption. On the positive side, it reduces
3777 interrupt wake-up latency, which may improve performance
3779 real-time systems.
3789 compared. However, if this command-line option is
3830 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3832 [Deprecated - use intremap=off]
3834 nointroute [IA-64]
3840 noirqdebug [X86-32] Disables the code which attempts to detect and
3845 nojitter [IA-64] Disables jitter checking for ITC timers.
3852 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3855 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3857 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3859 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3861 nomca [IA-64] Disable machine check abort handling
3863 nomce [X86-32] Disable Machine Check Exception
3865 nomfgpt [X86-32] Disable Multi-Function General Purpose
3871 not load if they could possibly displace the pre-
3874 perform display-mode changes or accelerated rendering.
3887 nopcid [X86-64] Disable the PCID cpu feature.
3892 nopti [X86-64]
3908 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3914 nosbagart [IA-64]
3916 no-scroll [VGA] Disables scrollback.
3917 This is required for the Braillex ib80-piezo Braille
3920 nosgx [X86-64,SGX] Disables Intel SGX kernel support.
3940 nosoftlockup [KNL] Disable the soft-lockup detector.
3945 nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
3958 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
3968 [PPC] Don't flush the L1-D cache after accessing user data.
3981 no-vmw-sched-clock
3986 soft-lockup and NMI watchdog (hard-lockup).
3990 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3998 enabling legacy floating-point and sse state.
4024 nptcg= [IA-64] Override max number of concurrent global TLB
4033 n. So during boot up some boot time memory for per-cpu
4034 variables need be pre-allocated for later physical cpu
4049 See Documentation/admin-guide/sysctl/vm.rst for details.
4052 See Documentation/core-api/debugging-via-ohci1394.rst for more
4067 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4071 boundary - index of last SLC block on Flex-OneNAND.
4073 lock - Configure if Flex-OneNAND boundary should be locked.
4087 running on a platform with a direct-mapped memory-side
4093 page_owner= [KNL] Boot-time page_owner enabling option.
4099 page_poison= [KNL] Boot-time parameter changing the state of
4126 See Documentation/admin-guide/tainted-kernels.rst for
4155 Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] }
4157 IRQ/DMA settings detected (the default is to
4158 ignore detected IRQ/DMA settings because of
4160 address, IRQ, and DMA settings; IRQ and DMA
4178 Set to non-zero to probe primary and secondary ISA
4184 Set to non-zero if a chip is present that snoops speed
4232 Set to non-zero to probe tertiary and further ISA
4248 Set to non-zero to probe QDI controllers. By default
4253 Set to non-zero to probe Winbond controllers. Use
4300 bios [X86-32] force use of PCI BIOS, don't access
4302 has a non-standard PCI host bridge.
4303 nobios [X86-32] disallow use of PCI BIOS, only direct
4309 data in IO port 0xCFC, both 32-bit).
4311 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4312 the function, IO port 0xCFA, also 8-bit, sets
4314 through ports 0xC000-0xCFFF).
4321 root domains (aka PCI segments, in ACPI-speak).
4329 disable the use of MSI interrupts system-wide.
4334 primary IO-APIC for bridges that cannot disable
4341 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4365 F0000h-100000h range.
4370 assign-busses [X86] Always assign all PCI bus
4391 <linux-pci@vger.kernel.org>.
4395 a bug to <linux-pci@vger.kernel.org>.
4407 bfsort Sort PCI devices into breadth-first order.
4410 nobfsort Don't sort PCI devices into breadth-first order.
4412 tuning and use the BIOS-configured MPS defaults.
4422 configuration allows peer-to-peer DMA between
4425 that hot-added devices will work.
4440 A PCI-PCI bridge can be specified if resource
4446 for 4096-byte alignment.
4448 end-to-end CRC checking). Only effective if
4479 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4515 dpc-native Use native PCIe service for DPC only. May
4532 Keep all power-domains already enabled by bootloader on,
4549 pirq= [SMP,APIC] Manual mp-table setup
4550 See Documentation/arch/x86/i386/IO-APIC.rst.
4554 See also Documentation/admin-guide/parport.rst.
4573 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4582 { on | off | curr | res | no-curr | no-res }
4622 none - Limited to cond_resched() calls
4623 voluntary - Limited to cond_resched() and might_sleep() calls
4624 full - Any section that isn't explicitly preempt disabled
4627 print-fatal-signals=
4633 coredump - etc.
4636 you might want to try "ulimit -i unlimited".
4648 or lockdep-detected issues (only if lock debug is on).
4657 on - unlimited logging to /dev/kmsg from userspace
4658 off - logging to /dev/kmsg disabled
4659 ratelimit - ratelimit the logging
4670 - 'always': traditional behavior always allows mem overrides.
4671 - 'ptrace': only allow mem overrides for active ptracers.
4672 - 'never': never allow mem overrides.
4676 Limit processor to maximum C-state
4680 Ignore the _CST method to determine C-states,
4687 Param: "schedule" - profile schedule points.
4688 Param: "kvm" - profile VM exits.
4689 Param: <number> - step/bucket size as a power of 2 for
4718 pti= [X86-64] Control Page Table Isolation of user and
4723 on - unconditionally enable
4724 off - unconditionally disable
4725 auto - kernel detects whether your CPU model is
4731 [KNL] Number of legacy pty's. Overwrites compiled-in
4743 See Documentation/admin-guide/md.rst.
4746 See Documentation/admin-guide/blockdev/ramdisk.rst.
4765 cross-syscall address exposures. This is only
4771 ras=option[,option,...] [KNL] RAS-specific options
4777 rcu_nocbs[=cpu-list]
4782 enable the no-callback CPU mode, which prevents
4787 "p" for RCU-preempt, "s" for RCU-sched, and "g"
4791 and real-time workloads. It can also improve
4795 list of CPUs is set to no-callback mode from boot.
4799 no-callback mode from boot but the mode may be
4810 This improves the real-time response for the
4827 RCU grace-period cleanup.
4831 RCU grace-period initialization.
4835 RCU grace-period pre-initialization, that is,
4836 the propagation of recent CPU-hotplug changes up
4840 Set delay from grace-period initialization to
4853 soliciting quiescent-state help from
4865 Set the SCHED_FIFO priority of the RCU per-CPU
4868 and for the RCU grace-period kthreads (rcu_bh,
4870 set, valid values are 1-99 and the default is 1
4871 (the least-favored priority). Otherwise, when
4872 RCU_BOOST is not set, valid values are 0-99 and
4873 the default is zero (non-realtime operation).
4878 On callback-offloaded (rcu_nocbs) CPUs,
4881 use of the ->nocb_bypass list. However, in the
4882 common non-flooded case, RCU queues directly to
4883 the main ->cblist in order to avoid the extra
4884 overhead of the ->nocb_bypass list and its lock.
4886 a single jiffy, RCU pre-queues the callbacks into
4887 the ->nocb_bypass queue. The definition of "too
4896 batch limiting is re-enabled.
4900 RCU's force-quiescent-state scan will aggressively
4908 Set the page-cache refill delay (in milliseconds)
4909 in response to low-memory conditions. The range
4913 Set the shift-right count to use to compute
4914 the callback-invocation batch limit bl from
4921 Please note that this callback-invocation batch
4922 limit applies only to non-offloaded callback
4931 cache-to-cache transfer latencies.
4937 and for NUMA systems with large remote-access
4953 the wakeup overhead on the global grace-period
4955 each group's NOCB grace-period kthread.
4958 Cause the grace-period kthread to get an extra
4960 it should at force-quiescent-state time.
4973 this specifies an rcu_read_unlock()-time delay
4977 of RCU-protected pointers after the relevant
4987 per-CPU rcuc kthreads. Defaults to a non-zero
4997 grace-period primitives such as call_rcu().
5008 grace-period primitives.
5011 Set test-start holdoff period. The purpose of
5029 Test the double-argument variant of kfree_rcu().
5031 rcuscale.kfree_rcu_test_single, both the single-
5032 and double-argument variants are tested.
5035 Test the single-argument variant of kfree_rcu().
5037 rcuscale.kfree_rcu_test_double, both the single-
5038 and double-argument variants are tested.
5052 does not affect the data-collection interval,
5057 Set number of RCU readers. The value -1 selects
5059 "n" less than -1 selects N-n+1, where N is again
5060 the number of CPUs. For example, -2 selects N
5061 (the number of CPUs), -3 selects N+1, and so on.
5062 A value of "n" less than or equal to -N selects
5075 complete. This is useful for hands-off automated
5082 Write-side holdoff between grace periods,
5087 Additional write-side holdoff between grace
5105 for RCU grace-period forward-progress testing
5112 Specify the fraction of a CPU-stall-warning
5113 period to do tight-loop forward-progress testing.
5117 forward-progress tests.
5121 need_resched() during tight-loop forward-progress
5125 Use conditional/asynchronous update-side
5129 Use expedited update-side primitives, if available.
5132 Use normal (non-expedited) asynchronous
5133 update-side primitives, if available.
5136 Use normal (non-expedited) synchronous
5137 update-side primitives, if available. If all
5141 they are all non-zero.
5149 Leak an RCU-protected pointer out of the reader.
5164 Set number of RCU callback-offload togglers.
5169 callback-offload toggling attempts.
5172 Set number of RCU readers. The value -1 selects
5173 N-1, where N is the number of CPUs. A value
5174 "n" less than -1 selects N-n-2, where N is again
5175 the number of CPUs. For example, -2 selects N
5176 (the number of CPUs), -3 selects N+1, and so on.
5179 Enable debug-object double-call_rcu() testing.
5182 Set time (s) after boot for CPU-hotplug testing.
5185 Set time (jiffies) between CPU-hotplug operations,
5186 or zero to disable CPU-hotplug testing.
5189 Set the number of read-then-exit kthreads used
5191 task-exit processing.
5194 The number of times in a given read-then-exit
5195 episode that a set of read-then-exit kthreads
5200 read-then-exit testing episodes.
5203 Set task-shuffle interval (s). Shuffling tasks
5204 allows some CPUs to go into dyntick-idle mode
5209 is useful for hands-off automated testing.
5218 any other stall-related activity. Note that
5224 in scheduling-while-atomic splats.
5237 grace-period kthread to test RCU CPU stall
5263 Test RCU's dyntick-idle handling. See also the
5312 Use expedited grace-period primitives, for
5316 real-time latency, and degrade energy efficiency.
5320 Use only normal grace-period primitives,
5323 real-time latency, CPU utilization, and
5325 increased grace-period latency. This parameter
5332 only normal grace-period primitives. No effect
5338 post-boot attempt at an expedited RCU grace
5339 period to instead use normal non-expedited
5340 grace-period processing.
5348 set to the default value of -1.
5351 Set the minimum number of callback-queuing-time
5352 lock-contention events per jiffy required to
5353 cause the RCU Tasks flavors to switch to per-CPU
5356 the default value of -1.
5361 of -1 allows this to be automatically (and
5369 number avoids disturbing real-time workloads,
5374 cancel laziness on that CPU. Use -1 to disable
5384 only printed prior to the stall-warning message
5440 force - Override the decision by the kernel to hide the
5468 Set test-start holdoff period. The purpose of
5477 but the default has already reduced the per-pass
5482 Set number of readers. The default value of -1
5491 Set the read-side critical-section duration,
5495 Specify the read-protection implementation to test.
5514 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
5522 reservetop= [X86-32]
5539 See Documentation/power/swsusp-and-swap-files.rst
5554 AMD-based UNRET and IBPB mitigations alone do not stop
5556 sibling threads. For that reason, STIBP is used on pro-
5560 off - no mitigation
5561 auto - automatically select a migitation
5562 auto,nosmt - automatically select a mitigation,
5566 ibpb - On AMD, mitigate short speculation
5571 ibpb,nosmt - Like "ibpb" above but will disable SMT
5575 unret - Force enable untrained return thunks,
5576 only effective on AMD f15h-f17h based
5578 unret,nosmt - Like unret, but will disable SMT when STIBP
5613 ro [KNL] Mount root device read-only on boot
5616 on Mark read-only kernel memory as read-only (default).
5617 off Leave read-only kernel memory writable for debugging.
5618 full Mark read-only kernel memory and aliases as read-only
5624 debug-uart get routed to the D+ and D- pins of the usb
5630 block/early-lookup.c for details.
5655 rw [KNL] Mount root device read-write on boot
5667 Specifies the size of the per device DMA address space
5668 accessible through the DMA and IOMMU APIs as a decimal
5671 as many DMA addresses as physical memory is installed,
5707 to 10 seconds for built-in smp_call_function()
5714 that requesting even small non-zero numbers of
5721 The default of -1 specifies a number of kthreads
5726 test before initiating CPU-hotplug operations.
5730 CPU-hotplug operations. Specifying zero (which
5731 is the default) disables CPU-hotplug operations.
5737 Non-zero values are useful for automated tests.
5760 "wait" parameter. A value of -1 selects the
5761 default if all other weights are -1. However,
5763 value of -1 will instead select a weight of zero.
5768 non-zero "wait" parameter. See weight_single.
5781 non-zero "wait" parameter. See weight_single
5793 non-zero "wait" parameter. See weight_single
5800 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
5801 1 -- enable.
5812 0 -- disable.
5813 1 -- enable.
5816 serialnumber [BUGS=X86-32]
5818 sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
5826 to set it to "all" by meaning -- no limit here.
5832 simeth= [IA-64]
5907 using the csdlock_debug- kernel parameter.
5912 system. By default, let CSD-lock acquisition
5914 for this value provides a 5-minute timeout.
5916 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5917 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5918 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5919 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5920 smsc-ircc2.ircc_irq= [HW] IRQ line
5921 smsc-ircc2.ircc_dma= [HW] DMA channel
5922 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5932 Default: -1 (no limit)
5935 [KNL] Should the soft-lockup detector generate panics.
5938 A value of 1 instructs the soft-lockup detector
5939 to panic the machine when a soft-lockup occurs. It is
5942 respective build-time switch to that functionality.
5945 [KNL] Should the soft-lockup detector generate
5950 See Documentation/admin-guide/laptops/sonypi.rst
5957 on - (default) Enable the HW or SW mitigation
5959 off - Disable the mitigation.
5966 on - unconditionally enable, implies
5968 off - unconditionally disable, implies
5970 auto - kernel detects whether your CPU model is
5987 retpoline - replace indirect branches
5988 retpoline,generic - Retpolines
5989 retpoline,lfence - LFENCE; indirect branch
5990 retpoline,amd - alias for retpoline,lfence
5991 eibrs - Enhanced/Auto IBRS
5992 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
5993 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
5994 ibrs - use IBRS to protect kernel
6004 on - Unconditionally enable mitigations. Is
6007 off - Unconditionally disable mitigations. Is
6010 prctl - Indirect branch speculation is enabled,
6016 - Like "prctl" above, but only STIBP is
6022 - Same as "prctl" above, but all seccomp
6027 - Like "seccomp" above, but only STIBP is
6032 auto - Kernel selects the mitigation depending on
6043 off - Disable mitigation
6044 microcode - Enable microcode mitigation only
6045 safe-ret - Enable sw-only safe RET mitigation (default)
6046 ibpb - Enable mitigation by issuing IBPB on
6048 ibpb-vmexit - Issue IBPB only on VMEXIT
6049 (cloud-specific mitigation)
6074 on - Unconditionally disable Speculative Store Bypass
6075 off - Unconditionally enable Speculative Store Bypass
6076 auto - Kernel detects whether the CPU model contains an
6082 prctl - Control Speculative Store Bypass per thread
6086 seccomp - Same as "prctl" above, but all seccomp threads
6094 on,auto - On Power8 and Power9 insert a store-forwarding
6098 off - No action.
6117 off - not enabled
6119 warn - the kernel will emit rate-limited warnings
6127 fatal - the kernel will send SIGBUS to applications
6132 ratelimit:N -
6152 Certain CPUs are vulnerable to an MDS-like
6172 This kernel-boot parameter defaults to 128,
6173 but takes effect only when the low-order four
6190 instead of the compile-time CONFIG_NR_CPUS.
6194 grace-period sequence counter wrap for the
6195 srcu_data structure's ->srcu_gp_seq_needed field.
6210 Specifies the number of no-delay instances
6217 Specifies the per-grace-period phase, number of
6218 non-sleeping polls of readers. Beyond this limit,
6224 Specifies number of microseconds of non-sleeping
6225 delay between each non-sleeping poll of readers.
6228 Specifies the number of update-side contention
6233 set for contention-based conversions to occur.
6243 force-on: Unconditionally enable mitigation for
6245 force-off: Unconditionally disable mitigation for
6268 stacktrace_filter=[function-list]
6270 will trace at boot up. function-list is a comma-separated
6278 Set the STI (builtin display/keyboard on the HP-PARISC
6280 as the initial boot-console.
6337 global a single global pool contains all CPUs
6338 percpu one pool for each CPU
6339 pernode one pool for each NUMA node (equivalent
6340 to global on non-NUMA machines)
6363 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
6365 <int> -- Number of I/O TLB slabs
6366 <int> -- Second integer after comma. Number of swiotlb
6369 force -- force using of bounce buffers even if they
6371 noforce -- Never use bounce buffers (for debugging)
6386 Ignore sysrq setting - this boot parameter will
6394 cache size. See Documentation/networking/ip-sysctl.rst
6401 Specify "mem" (for Suspend-to-RAM) or "standby" (for
6406 wakeup-capable RTC alarm.
6412 -1: disable all active trip points in all thermal zones
6416 -1: disable all critical trip points in all thermal zones
6423 -1: disable all passive trip points
6429 <deci-seconds>: poll all this frequency
6451 Prevent the CPU-hotplug component of torturing
6455 Dump the ftrace buffer at torture-test shutdown,
6459 with rotating-rust storage.
6464 disables verbose-printk() sleeping.
6467 Duration of each verbose-printk() sleep in jiffies.
6485 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
6523 local - Use the per CPU time stamp counter
6527 global - Event time stamps are synchronize across
6530 counter - Simple counting of events (1, 2, ..)
6534 uptime - Use jiffies as the time stamp.
6535 perf - Use the same clock that perf uses.
6536 mono - Use ktime_get_mono_fast_ns() for time stamps.
6537 mono_raw - Use ktime_get_raw_fast_ns() for time
6539 boot - Use ktime_get_boot_fast_ns() for time stamps.
6543 trace_event=[event-list]
6545 to facilitate early boot debugging. The event-list is a
6546 comma-separated list of trace events to enable. See
6549 trace_instance=[instance-info]
6569 trace_options=[option-list]
6571 The option-list is a comma delimited list of options
6585 trace_trigger=[trigger-list]
6622 See Documentation/admin-guide/mm/transhuge.rst
6630 - "tpm"
6631 - "tee"
6632 - "caam"
6642 - "kernel"
6643 - the same value as trusted.source: "tpm" or "tee"
6644 - "default"
6655 off - disable the mitigation
6656 on - enable the mitigation (default)
6657 user - mitigate only user/kernel transitions
6658 vm - mitigate only guest/host transitions
6666 high-resolution timer mode on older hardware, and in
6702 on - Enable TSX on the system. Although there are
6705 several previous speculation-related CVEs, and
6709 off - Disable TSX on the system. (Note that this
6717 auto - Disable TSX if X86_BUG_TAA is present,
6722 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6728 Similar to Micro-architectural Data Sampling (MDS)
6743 full - Enable TAA mitigation on vulnerable CPUs
6746 full,nosmt - Enable TAA mitigation and disable SMT on
6749 vulnerable to cross-thread TAA attacks.
6750 off - Unconditionally disable TAA mitigation
6752 On MDS-affected machines, tsx_async_abort=off can be
6764 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6770 See also Documentation/input/devices/joystick-parport.rst
6772 udbg-immortal [PPC] When debugging early kernel crashes that
6778 Set number of hash buckets for UDP/UDP-Lite connections
6780 uhci-hcd.ignore_oc=
6782 Some badly-designed motherboards generate lots of
6791 unwind_debug [X86-64]
6799 (default -1 = authorized (same as 1),
6805 for newly-detected USB devices (default 2). This
6833 [USB] Specifies timeout for the initial 64-byte
6840 [USB] A list of quirk entries to augment the built-in
6843 VendorID:ProductID:Flags. The IDs are 4-digit hex
6845 will change the built-in quirk; setting it if it is
6850 a 255-byte read);
6854 Set-Interface requests);
6873 (bInterval-1).
6911 usb-storage.delay_use=
6915 usb-storage.quirks=
6917 override the built-in unusual_devs list. List
6920 and Product ID values (4-digit hex numbers) and
6922 to a common usb-storage quirk flag as follows:
6964 medium is write-protected).
6973 1 - undefined instruction events
6974 2 - system calls
6975 4 - invalid data aborts
6976 8 - SIGSEGV faults
6977 16 - SIGBUS faults
6993 vdso32= [X86] Control the 32-bit vDSO
6994 vdso32=1: enable 32-bit VDSO
6995 vdso32=0 or vdso32=2: disable 32-bit VDSO
7005 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7007 vector= [IA-64,SMP]
7039 vga= [BOOT,X86-32] Select a particular video mode
7041 Documentation/admin-guide/svga.rst.
7056 - Disable all of the above options
7077 vsyscall= [X86-64]
7080 code). Most statically-linked binaries and older
7104 see VGA-softcursor.txt. Default: 2 = underline.
7109 This is a 16-member array composed of values
7110 ranging from 0-255.
7115 This is a 16-member array composed of values
7116 ranging from 0-255.
7121 This is a 16-member array composed of values
7122 ranging from 0-255.
7127 Set system-wide default UTF-8 mode for all tty's.
7128 Default is 1, i.e. UTF-8 mode is enabled for all
7133 Format=<-1|0|1>
7134 Set system-wide default for whether a cursor
7135 is shown on new VTs. Default is -1,
7140 vt.italic= [VT] Default color for italic text; 0-15.
7143 vt.underline= [VT] Default color for underlined text; 0-15.
7147 see Documentation/watchdog/watchdog-parameters.rst
7148 or other driver-specific files in the
7162 Format: <cpu-list>
7176 Per-cpu work items which run for longer than this
7179 them from noticeably delaying other per-cpu work
7188 Per-cpu workqueues are generally preferred because
7190 locality; unfortunately, per-cpu workqueues tend to
7193 Enabling this makes the per-cpu workqueues which
7207 Documentation/core-api/workqueue.rst.
7220 forces round-robin CPU selection to flush out
7228 on - Enable writecombine, use WUC for ioremap_wc()
7229 off - Disable writecombine, use SUC for ioremap_wc()
7231 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
7235 xen_512gb_limit [KNL,X86-64,XEN]
7245 ide-disks -- unplug primary master IDE devices
7246 aux-ide-disks -- unplug non-primary-master IDE devices
7247 nics -- unplug network devices
7248 all -- unplug all emulated devices (NICs and IDE disks)
7249 unnecessary -- unplugging emulated devices is
7252 never -- do not unplug even if version check succeeds
7260 Select whether to always use non-faulting (safe) MSR
7285 xen_timer_slop= [X86-64,XEN]
7310 preferred over the 2-level event handling, as it is
7327 xive.store-eoi=off [PPC]
7333 xhci-hcd.quirks [USB,KNL]