Lines Matching +full:0 +full:x86
1 acpi= [HW,ACPI,X86,ARM64]
21 1,0: use 1st APIC table
22 default: 0
62 acpi.debug_layer=0x20000000
64 acpi.debug_layer=0x400000
67 acpi.debug_layer=0xffffffff acpi.debug_level=0x2
69 acpi.debug_layer=0x2 acpi.debug_level=0xffffffff
93 By default, this is disabled due to x86 early mapping
217 acpi_pm_good [X86]
255 add_efi_memmap [EFI; X86] Include EFI memory map in
269 behaviour to be specified. Bit 0 enables warnings,
272 align_va_addr= [X86-64]
292 amd_iommu= [HW,X86-64]
307 amd_iommu_dump= [HW,X86-64]
313 amd_iommu_intr= [HW,X86-64]
339 apic= [APIC,X86] Advanced Programmable Interrupt Controller
344 For X86-32, this can also be used to specify an APIC
349 apic_extnmi= [APIC,X86] External NMI delivery setting
351 bsp: External NMI is delivered only to CPU 0
353 backup of CPU 0
361 show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller
371 See header of arch/x86/kernel/apm_32.c.
392 Format: <bool> (0 = real, 1 = synthetic (default))
398 Format: { "0" | "1" | "off" | "on" }
399 0 | off - kernel audit is disabled and can not be
410 Format: <int> (must be >=0)
414 behavior is to disable the BAU (i.e. bau=0).
415 Format: { "0" | "1" }
416 0 - Disable the BAU.
443 no delay (0).
455 bgrt_disable [ACPI][X86]
470 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
488 algorithm. Accepted values range from 0 to 7
523 Format: { "0" | "1" }
525 0 -- check protection applied by kernel (includes
547 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
564 [X86-32] pit,hpet,tsc;
571 [X86-64] hpet,tsc
587 clearcpuid=BITNUM[,BITNUM...] [X86]
589 arch/x86/include/asm/cpufeatures.h for the valid bit
605 memory allocations. A value of 0 disables CMA
612 contiguous memory allocations. A value of 0 disables
614 specificed, the default value is 0.
666 uart[8250],0x<addr>[,options]
700 seconds. A value of 0 disables the blank timer.
701 Defaults to 0.
712 0: default value, disable debugging
730 [X86] Delay for N microsec between assert and de-assert
745 [KNL, X86-64] Select a region under 4G first, and
758 [KNL, X86-64] range could be above 4G. Allow kernel
765 [KNL, X86-64] range under 4G. When crashkernel=X,high
775 0: to disable low allocation.
813 Format=<0|1>
816 We default to 0 (no extra messages), setting it to
868 debugpat [X86] Enable PAT debugging
885 drivers) that have opted in will be ignored. A timeout of 0
941 disable_cpu_apicid= [X86,APIC,SMP]
950 perf_v4_pmi= [X86,INTEL]
963 disable_mtrr_cleanup [X86]
968 disable_mtrr_trim [X86, Intel and AMD only]
974 disable_timer_pin_1 [X86]
978 dis_ucode_ldr [X86] Disable the microcode loader.
998 [X86] Controls mitigation for Register File Data
1050 dump_apple_properties [X86]
1052 x86 Macs. Useful for driver authors to determine
1061 nopku [X86] Disable Memory Protection Keys CPU feature found
1090 uart[8250],0x<addr>[,options]
1191 coherent non-x86 systems that use system memory for
1201 earlyprintk= [X86,SH,ARM,M68k,S390]
1206 earlyprintk=serial[,0x...[,baudrate]]
1224 on some architectures (x86 and arm at least) by
1226 earlyprintk=serial,0x1008,115200
1253 ekgdboc= [X86,KGDB] Allow early kernel console debugging
1288 efi_no_storage_paranoia [EFI; X86]
1294 efi_fake_mem= nn[KMG]@ss[KMG]:aa[,nn[KMG]@ss[KMG]:aa,..] [EFI; X86]
1300 If efi_fake_mem=2G@4G:0x10000,2G@0x10a0000000:0x10000
1301 is specified, EFI_MEMORY_MORE_RELIABLE(0x10000)
1302 attribute is added to range 0x100000000-0x180000000 and
1303 0x10a0000000-0x1120000000.
1305 If efi_fake_mem=8G@9G:0x40000 is specified, the
1306 EFI_MEMORY_SP(0x40000) attribute is added to
1307 range 0x240000000-0x43fffffff.
1315 efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
1325 elanfreq= [X86-32]
1327 arch/x86/kernel/cpu/cpufreq/elanfreq.c.
1329 elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390]
1335 enable_mtrr_cleanup [X86]
1340 enable_timer_pin_1 [X86]
1347 Format: {"0" | "1"}
1349 0 -- permissive (log only, no denials).
1351 Default value is 0.
1390 forcepae [X86-32]
1439 in the tracefs tracing directory. default: 0 (no limit)
1467 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1472 [X86,INTEL] Control the Gather Data Sampling (GDS)
1497 goldfish [X86] Enable the goldfish android emulator platform.
1506 grcan.enable0= [HW] Configuration of physical interface 0. Determines
1507 the "Enable 0" bit of the configuration register.
1508 Format: 0 | 1
1509 Default: 0
1511 the "Enable 0" bit of the configuration register.
1512 Format: 0 | 1
1513 Default: 0
1515 Format: 0 | 1
1516 Default: 0
1518 Format: <unsigned int> such that (txsize & ~0x1fffc0) == 0.
1521 Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
1531 Format: 0 | 1
1536 Format: 0 | 1 (for off | on)
1559 hpet= [X86-32,HPET] option to control HPET usage
1567 hpet_mmap= [X86, HPET_MMAP] Allow userspace to mmap HPET
1599 Format: 0 | 1
1608 terminal devices. Valid values: 0..8
1613 hv_nopvspin [X86,HYPER_V] Disables the paravirt spinlock optimizations
1650 Format: { 1 | Y | y | 0 | N | n }
1652 0, N, n: don't ever reset controller
1653 Default: only on s2r transitions on x86; most other
1676 brightness value of 0 indicates backlight switched off,
1678 to maximum brightness. If this parameter is set to 0
1680 is set to 1, a brightness value of 0 sets the backlight
1684 0 -- machine default
1701 default value is 0x0, which has a special meaning.
1705 of 0x0 enables probing the two first ports as if it
1706 was 0x3.
1711 idle= [X86]
1777 owned by uid=0.
1798 mode bit set by either the effective uid (euid=0) or
1799 uid=0.
1817 opened for read by uid=0.
1865 Default is 0, 0
1869 Format: 0 | 1
1873 Format: 0 | 1
1876 init_pkru= [X86] Specify the default memory protection keys rights
1877 register contents for all processes. 0x55555554 by
1878 default (disallow access to all but pkey 0). Can
1884 int_pln_enable [X86] Enable power limit notification interrupt
1887 Format: { "0" | "1" }
1888 0 -- basic integrity auditing messages. (Default)
1902 forcedac [X86-64]
1937 intel_idle.max_cstate= [KNL,HW,ACPI,X86]
1938 0 disables intel_idle and fall back on acpi_idle.
1941 intel_pstate= [X86]
1975 intremap= [X86-64, Intel-IOMMU]
1987 iommu= [X86]
1997 pt [X86]
1998 nopt [X86]
2003 Format: { "0" | "1" }
2004 0 - Lazy mode.
2015 [ARM64, X86] Configure DMA to bypass the IOMMU by default.
2016 Format: { "0" | "1" }
2017 0 - Use IOMMU translation for DMA.
2025 io_delay= [X86] I/O delay method
2026 0x80
2027 Standard port 0x80 based delay
2028 0xed
2029 Alternate port 0xed based delay (needed on some systems)
2110 <cpu number> begins at 0 and the maximum value is
2141 ivrs_ioapic [HW,X86-64]
2144 By default, PCI segment is 0, and can be omitted.
2147 PCI segment 0x1 and PCI device 00:14.0,
2155 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2159 ivrs_hpet [HW,X86-64]
2162 By default, PCI segment is 0, and can be omitted.
2165 PCI segment 0x1 and PCI device 00:14.0,
2170 * To map HPET-ID decimal 0 to PCI device 00:14.0
2172 ivrs_hpet[0]=00:14.0
2173 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2177 ivrs_acpihid [HW,X86-64]
2180 By default, PCI segment is 0, and can be omitted.
2182 For example, to map UART-HID:UID AMD0020:0 to
2183 PCI segment 0x1 and PCI device ID 00:14.5,
2185 ivrs_acpihid=AMD0020:0@0001:00:14.5
2188 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2190 ivrs_acpihid[00:14.5]=AMD0020:0
2191 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2193 ivrs_acpihid[0001:00:14.5]=AMD0020:0
2211 kernelcore= [KNL,X86,IA-64,PPC]
2301 0: force disabled
2305 Default is 0 (don't ignore, but inject #GP)
2312 Default is 0 (off)
2329 back to huge pages. 0 disables the recovery, otherwise if
2341 [KVM,ARM] Trap guest accesses to GICv3 group-0
2382 Default is 0 (disabled)
2405 l1tf= [X86] Control mitigation of the L1TF vulnerability on
2474 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2477 lapic= [X86,APIC] Do not use TSC deadline
2482 lapic_timer_c2_ok [X86,APIC] trust the local apic timer
2486 libata.dma=0 Disable all PATA and SATA DMA
2494 libata.ignore_hpa=0 keep BIOS limits (default)
2512 number of 0 either selects the first device or the
2527 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2623 0 (KERN_EMERG) system is unusable
2645 lp=0 [LP] Specify parallel ports to use, e.g,
2647 lp=reset first parallel port). 'lp=0' disables the
2665 CPU). 0 enables autodetection (default). To determine
2697 will bring up during bootup. maxcpus=n : n >= 0 limits
2702 While n=0 is a special case, it is equivalent to "nosmp",
2712 mce [X86-32] Machine Check Exception
2714 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2723 mds= [X86,INTEL]
2763 [X86] Work as limiting max address. Use together
2772 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2787 memmap=exactmap [KNL,X86] Enable setting of an exact
2810 Example: Exclude memory from 0x18690000-0x1869ffff
2811 memmap=64K$0x18690000
2813 memmap=0x10000$0x18690000
2819 [KNL,X86] Mark specific memory as protected.
2821 The memory region may be marked as e820 type 12 (0xc)
2833 memory_corruption_check=0/1 [X86]
2845 memory_corruption_check_size=size [X86]
2851 memory_corruption_check_period=seconds [X86]
2854 other rate. 0 disables periodic checking.
2856 memtest= [KNL,X86,ARM,PPC] Enable memtest
2858 default : 0 <disable>
2866 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2890 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2901 Format:[0..2][b][c][t]
2902 Default: "0tb"
2904 0 - The attached screen is the 3.5" TFT
2922 [X86,PPC,S390,ARM64] Control optional mitigations for
2931 Equivalent to: gather_data_sampling=off [X86]
2932 kpti=0 [ARM64]
2933 kvm.nx_huge_pages=off [X86]
2934 l1tf=off [X86]
2935 mds=off [X86]
2936 mmio_stale_data=off [X86]
2939 nobp=0 [S390]
2940 nopti [X86,PPC]
2941 nospectre_v1 [X86,PPC]
2942 nospectre_v2 [X86,PPC,S390,ARM64]
2943 reg_file_data_sampling=off [X86]
2944 retbleed=off [X86]
2945 spec_store_bypass_disable=off [X86,PPC]
2946 spectre_v2_user=off [X86]
2948 tsx_async_abort=off [X86]
2967 Equivalent to: l1tf=flush,nosmt [X86]
2968 mds=full,nosmt [X86]
2969 tsx_async_abort=full,nosmt [X86]
2970 mmio_stale_data=full,nosmt [X86]
2971 retbleed=auto,nosmt [X86]
2977 of 0 disables mminit logging and a level of 4 will
2982 [X86,INTEL] Control mitigation for the Processor
3035 movablecore= [KNL,X86,IA-64,PPC]
3073 1 indicates lock status, 0 indicates unlock status.
3084 mtrr_chunk_size=nn[KMG] [X86]
3088 mtrr_gran_size=nn[KMG] [X86]
3094 mtrr_spare_reg_nr=n [X86]
3096 Range: 0,7 : spare reg number
3112 0 to disable accounting
3114 Default value is 0.
3179 To turn off this behaviour, set the value to '0'.
3203 The default parameter value of '0' causes the kernel
3210 Setting this to value to 0 causes the kernel to use
3230 nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels
3232 Valid num: 0 or 1
3233 0 - turn hardlockup detector in nmi_watchdog off
3251 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3255 no5lvl [X86-64] Disable 5-level paging mode. Forces
3258 nofsgsbase [X86] Disables FSGSBASE instructions.
3305 noclflush [BUGS=X86] Don't use the CLFLUSH instruction
3317 noexec [X86]
3318 On X86-32 available only on PAE configured kernels.
3322 nosmap [X86,PPC]
3326 nosmep [X86,PPC]
3330 noexec32 [X86-64]
3339 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3343 nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
3348 [KNL,X86] Disable symmetric multithreading (SMT).
3352 nospectre_v1 [X86,PPC] Disable mitigations for Spectre Variant 1
3356 nospectre_v2 [X86,PPC_FSL_BOOK3E,ARM64] Disable all mitigations for
3367 noxsave [BUGS=X86] Disables x86 extended register state save
3371 noxsaveopt [X86] Disables xsaveopt used in saving x86 extended
3378 noxsaves [X86] Disables xsaves and xrstors used in saving and
3379 restoring x86 extended register state in compacted
3419 noirqdebug [X86-32] Disables the code which attempts to detect and
3422 no_timer_check [X86,APIC] Disables the code which tests for
3430 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3436 noinvpcid [X86] Disable the INVPCID cpu feature.
3440 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3442 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3446 [X86,PV_OPS] Disable paravirtualized VMware scheduler
3449 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3453 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3455 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3462 nomce [X86-32] Disable Machine Check Exception
3464 nomfgpt [X86-32] Disable Multi-Function General Purpose
3467 nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to
3473 nopat [X86] Disable PAT (page attribute table extension of
3476 nopcid [X86-64] Disable the PCID cpu feature.
3479 echo 0 > /proc/sys/kernel/randomize_va_space
3481 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3484 nordrand [X86] Disable kernel use of the RDRAND and
3498 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3501 and disable the IO APIC. legacy for "maxcpus=0".
3512 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3514 cpu0_hotplug [X86] Turn on CPU0 hotplug feature when
3552 numa_balancing= [KNL,X86] Enable or disable automatic NUMA balancing.
3574 omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
3583 arch_perfmon: [X86] Force use of architectural
3586 timer: [X86] Force use of architectural NMI
3619 timeout > 0: seconds before rebooting
3620 timeout = 0: wait forever
3621 timeout < 0: reboot immediately
3626 bit 0: print all tasks info
3658 connected to, default is 0.
3661 0 for XT, 1 for AT (default is AT).
3664 parport= [HW,PPT] Specify parallel ports. 0 disables.
3665 Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] }
3723 off [X86] don't probe for the PCI bus
3724 bios [X86-32] force use of PCI BIOS, don't access
3727 nobios [X86-32] disallow use of PCI BIOS, only direct
3731 conf1 [X86] Force use of PCI Configuration Access
3732 Mechanism 1 (config address in IO port 0xCF8,
3733 data in IO port 0xCFC, both 32-bit).
3734 conf2 [X86] Force use of PCI Configuration Access
3735 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3736 the function, IO port 0xCFA, also 8-bit, sets
3738 through ports 0xC000-0xCFFF).
3746 nommconf [X86] Disable use of MMCONFIG for PCI
3748 check_enable_amd_mmconf [X86] check for and enable
3765 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3773 rom [X86] Assign address space to expansion ROMs.
3777 norom [X86] Do not assign address space to
3780 nobar [X86] Do not assign address space to the
3782 irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be
3786 pirqaddr=0xAAAAA [X86] Specify the physical address
3790 lastbus=N [X86] Scan all buses thru bus #N. Can be
3794 assign-busses [X86] Always assign all PCI bus
3797 usepirqmask [X86] Honor the possible IRQ mask stored
3803 noacpi [X86] Do not use ACPI for IRQ routing
3805 use_crs [X86] Use PCI host bridge window information
3809 nocrs [X86] Ignore PCI host bridge windows from ACPI.
3815 skip_isa_align [X86] do not align io start addr, so can
3817 noearly [X86] Don't do any early type 1 scanning.
3955 Format: { 0 | 1 }
3972 See Documentation/x86/i386/IO-APIC.rst.
3975 Format: { parport<nr> | timid | 0 }
3978 pmtmr= [X86] Manual setup of pmtmr I/O Port.
3980 e.g. pmtmr=0x508
4050 Format: <bool> (1/Y/y=enable, 0/N/n=disable)
4061 Format: <bool> (1/Y/y=enable, 0/N/n=disable)
4099 (0 = never).
4104 0 = disabled, 1 = enabled (default).
4111 pti= [X86-64] Control Page Table Isolation of user and
4123 nopti [X86-64]
4156 cec_disable [X86]
4214 Specify rcutree.use_softirq=0 to use rcuc kthreads.
4271 RCU_BOOST is not set, valid values are 0-99 and
4534 Test RCU priority boosting? 0=no, 1=maybe, 2=yes.
4614 rdrand= [X86]
4621 rdt= [HW,X86,RDT]
4629 Format (x86 or x86_64):
4654 x86 laptops.
4675 refscale is built into the kernel and to 0 (leave
4688 them. If <base> is less than 0x10000, the region
4691 reservetop= [X86-32]
4696 reservelow= [X86]
4733 retbleed= [X86] Control mitigation of RETBleed (Arbitrary
4771 0 "airplane mode". All wifi, bluetooth, wimax, gps, fm,
4776 0 The "airplane mode" button does nothing.
4838 schedstats= [KNL,X86] Enable or disable scheduled statistics.
4856 Format: integer between 0 and 10
4857 Default is 0.
4954 Format: { "0" | "1" }
4955 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
4965 Format: { "0" | "1" }
4967 0 -- disable.
4972 Format: { "0" | "1" }
4974 0 -- disable.
4978 serialnumber [BUGS=X86-32]
5005 more than 32MB of RAM, 0 otherwise.
5017 memory cgroup sub-caches. 1 to enable, 0 to disable.
5057 0: Toshiba Satellite 1800 (GP data pin select)
5070 Format: 0 | 1
5081 Format: 0 | 1
5086 spectre_v2= [X86] Control mitigation of Spectre variant 2
5125 [X86] Control mitigation of Spectre variant 2
5167 [X86] Control RAS overflow mitigation on AMD Zen CPUs
5198 On x86 the options are:
5216 X86: If CONFIG_SECCOMP=y "seccomp", otherwise "prctl"
5235 [X86] Enable split lock detection
5256 srbds= [X86,INTEL]
5346 range 0 < portnr < 1024).
5357 The default value is 0 (no limit).
5392 Format: { on | off | y | n | 1 | 0 }
5396 swapaccount=[0|1]
5399 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5401 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5419 sysfs.deprecated=0|1 [KNL]
5477 0: no polling (default)
5552 echo 0 > /proc/sys/kernel/tracepoint_printk
5585 [x86] reliable: mark tsc clocksource as reliable, this
5590 [x86] noirqtime: Do not use TSC to do irq accounting.
5594 [x86] unstable: mark the TSC clocksource as unstable, this
5597 [x86] nowatchdog: disable clocksource watchdog. Used
5602 tsc_early_khz= [X86] Skip early TSC calibration and use the given
5608 tsx= [X86] Control Transactional Synchronization
5637 tsx_async_abort= [X86,INTEL] Control mitigation for the TSX Async
5701 [X86] Cause panic on unknown NMI.
5706 0 = not authorized, 1 = authorized, 2 = authorized
5717 [USB] Set to log all usbfs traffic (default 0 = off).
5724 [USB] Set to cycle leds on hubs (default 0 = off).
5728 scheme (default 0 = off).
5732 usbfs (default = 16, 0 = max = 2047).
5803 Example: quirks=0781:5580:bk,0a5c:5834:gij
5884 [X86] Flags controlling user PTE allocations.
5890 vdso= [X86,SH]
5894 vdso=0: disable VDSO mapping
5896 vdso32= [X86] Control the 32-bit vDSO
5898 vdso32=0 or vdso32=2: disable 32-bit VDSO
5902 vdso32=0; otherwise, the default is vdso32=1.
5905 alias for vdso32=0.
5907 Try vdso32=0 if you encounter an error that says:
5916 video.brightness_switch_enabled= [0,1]
5920 the allocated input device; If set to 0, video driver
5937 virtio_mmio.device=1K@0x100b0000:48:7
5941 vga= [BOOT,X86-32] Select a particular video mode
5942 See Documentation/x86/boot.rst and
5962 minimum size (128MB on x86). It can also be used to
5979 vsyscall= [X86-64]
5981 fixed addresses of 0xffffffffff600x00 from legacy
6000 Format: 0xYX, X = foreground, Y = background.
6001 Default: 0x07 = light gray on black.
6004 Format: 0xCCBBAA, where AA, BB, and CC are the same as
6012 ranging from 0-255.
6018 ranging from 0-255.
6024 ranging from 0-255.
6028 Format=<0|1>
6035 Format=<-1|0|1>
6039 overridden by individual drivers. 0 will hide
6042 vt.italic= [VT] Default color for italic text; 0-15.
6045 vt.underline= [VT] Default color for underlined text; 0-15.
6057 threshold is set to twice the value. A value of 0
6064 help debugging. 0 disables workqueue stall
6111 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
6115 x86_intel_mid_timer= [X86-32,APBT]
6116 Choose timer option for x86 Intel MID platform.
6121 xen_512gb_limit [KNL,X86-64,XEN]
6128 xen_emul_unplug= [HW,X86,XEN]
6140 xen_legacy_crash [X86,XEN]
6144 xen_nopvspin [X86,XEN]
6149 xen_nopv [X86]
6156 [KNL,X86,XEN] Disable the vector callback for Xen
6165 xen_timer_slop= [X86-64,XEN]
6194 nopv= [X86,XEN,KVM,HYPER_V,VMWARE]
6199 nopvspin [X86,XEN,KVM]