| Kconfig (74c12ee02af109adcde36ec184fa59c0afb0edaa) | Kconfig (40d04110f87940b6a03bf0aa19cd29e84f465f20) |
|---|---|
| 1# SPDX-License-Identifier: GPL-2.0 2# Select 32 or 64 bit 3config 64BIT 4 bool "64-bit kernel" if "$(ARCH)" = "x86" 5 default "$(ARCH)" != "i386" 6 ---help--- 7 Say yes to build a 64-bit kernel - formerly known as x86_64 8 Say no to build a 32-bit kernel - formerly known as i386 --- 10 unchanged lines hidden (view full) --- 19 select OLD_SIGACTION 20 select GENERIC_VDSO_32 21 22config X86_64 23 def_bool y 24 depends on 64BIT 25 # Options that are inherently 64-bit kernel only: 26 select ARCH_HAS_GIGANTIC_PAGE | 1# SPDX-License-Identifier: GPL-2.0 2# Select 32 or 64 bit 3config 64BIT 4 bool "64-bit kernel" if "$(ARCH)" = "x86" 5 default "$(ARCH)" != "i386" 6 ---help--- 7 Say yes to build a 64-bit kernel - formerly known as x86_64 8 Say no to build a 32-bit kernel - formerly known as i386 --- 10 unchanged lines hidden (view full) --- 19 select OLD_SIGACTION 20 select GENERIC_VDSO_32 21 22config X86_64 23 def_bool y 24 depends on 64BIT 25 # Options that are inherently 64-bit kernel only: 26 select ARCH_HAS_GIGANTIC_PAGE |
| 27 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 | 27 select ARCH_SUPPORTS_INT128 |
| 28 select ARCH_USE_CMPXCHG_LOCKREF 29 select HAVE_ARCH_SOFT_DIRTY 30 select MODULES_USE_ELF_RELA 31 select NEED_DMA_MAP_STATE 32 select SWIOTLB 33 select ARCH_HAS_SYSCALL_WRAPPER 34 35config FORCE_DYNAMIC_FTRACE --- 32 unchanged lines hidden (view full) --- 68 select ARCH_HAS_FORTIFY_SOURCE 69 select ARCH_HAS_GCOV_PROFILE_ALL 70 select ARCH_HAS_KCOV if X86_64 71 select ARCH_HAS_MEM_ENCRYPT 72 select ARCH_HAS_MEMBARRIER_SYNC_CORE 73 select ARCH_HAS_PMEM_API if X86_64 74 select ARCH_HAS_PTE_DEVMAP if X86_64 75 select ARCH_HAS_PTE_SPECIAL | 28 select ARCH_USE_CMPXCHG_LOCKREF 29 select HAVE_ARCH_SOFT_DIRTY 30 select MODULES_USE_ELF_RELA 31 select NEED_DMA_MAP_STATE 32 select SWIOTLB 33 select ARCH_HAS_SYSCALL_WRAPPER 34 35config FORCE_DYNAMIC_FTRACE --- 32 unchanged lines hidden (view full) --- 68 select ARCH_HAS_FORTIFY_SOURCE 69 select ARCH_HAS_GCOV_PROFILE_ALL 70 select ARCH_HAS_KCOV if X86_64 71 select ARCH_HAS_MEM_ENCRYPT 72 select ARCH_HAS_MEMBARRIER_SYNC_CORE 73 select ARCH_HAS_PMEM_API if X86_64 74 select ARCH_HAS_PTE_DEVMAP if X86_64 75 select ARCH_HAS_PTE_SPECIAL |
| 76 select ARCH_HAS_REFCOUNT |
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| 76 select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64 77 select ARCH_HAS_UACCESS_MCSAFE if X86_64 && X86_MCE 78 select ARCH_HAS_SET_MEMORY 79 select ARCH_HAS_SET_DIRECT_MAP 80 select ARCH_HAS_STRICT_KERNEL_RWX 81 select ARCH_HAS_STRICT_MODULE_RWX 82 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE 83 select ARCH_HAS_UBSAN_SANITIZE_ALL --- 4 unchanged lines hidden (view full) --- 88 select ARCH_STACKWALK 89 select ARCH_SUPPORTS_ACPI 90 select ARCH_SUPPORTS_ATOMIC_RMW 91 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 92 select ARCH_USE_BUILTIN_BSWAP 93 select ARCH_USE_QUEUED_RWLOCKS 94 select ARCH_USE_QUEUED_SPINLOCKS 95 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH | 77 select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64 78 select ARCH_HAS_UACCESS_MCSAFE if X86_64 && X86_MCE 79 select ARCH_HAS_SET_MEMORY 80 select ARCH_HAS_SET_DIRECT_MAP 81 select ARCH_HAS_STRICT_KERNEL_RWX 82 select ARCH_HAS_STRICT_MODULE_RWX 83 select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE 84 select ARCH_HAS_UBSAN_SANITIZE_ALL --- 4 unchanged lines hidden (view full) --- 89 select ARCH_STACKWALK 90 select ARCH_SUPPORTS_ACPI 91 select ARCH_SUPPORTS_ATOMIC_RMW 92 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 93 select ARCH_USE_BUILTIN_BSWAP 94 select ARCH_USE_QUEUED_RWLOCKS 95 select ARCH_USE_QUEUED_SPINLOCKS 96 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
| 96 select ARCH_WANT_DEFAULT_BPF_JIT if X86_64 | |
| 97 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 98 select ARCH_WANT_HUGE_PMD_SHARE 99 select ARCH_WANTS_THP_SWAP if X86_64 | 97 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 98 select ARCH_WANT_HUGE_PMD_SHARE 99 select ARCH_WANTS_THP_SWAP if X86_64 |
| 100 select BUILDTIME_TABLE_SORT | 100 select BUILDTIME_EXTABLE_SORT |
| 101 select CLKEVT_I8253 102 select CLOCKSOURCE_VALIDATE_LAST_CYCLE 103 select CLOCKSOURCE_WATCHDOG 104 select DCACHE_WORD_ACCESS 105 select EDAC_ATOMIC_SCRUB 106 select EDAC_SUPPORT 107 select GENERIC_CLOCKEVENTS 108 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) --- 6 unchanged lines hidden (view full) --- 115 select GENERIC_IOMAP 116 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP 117 select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC 118 select GENERIC_IRQ_MIGRATION if SMP 119 select GENERIC_IRQ_PROBE 120 select GENERIC_IRQ_RESERVATION_MODE 121 select GENERIC_IRQ_SHOW 122 select GENERIC_PENDING_IRQ if SMP | 101 select CLKEVT_I8253 102 select CLOCKSOURCE_VALIDATE_LAST_CYCLE 103 select CLOCKSOURCE_WATCHDOG 104 select DCACHE_WORD_ACCESS 105 select EDAC_ATOMIC_SCRUB 106 select EDAC_SUPPORT 107 select GENERIC_CLOCKEVENTS 108 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC) --- 6 unchanged lines hidden (view full) --- 115 select GENERIC_IOMAP 116 select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP 117 select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC 118 select GENERIC_IRQ_MIGRATION if SMP 119 select GENERIC_IRQ_PROBE 120 select GENERIC_IRQ_RESERVATION_MODE 121 select GENERIC_IRQ_SHOW 122 select GENERIC_PENDING_IRQ if SMP |
| 123 select GENERIC_PTDUMP | |
| 124 select GENERIC_SMP_IDLE_THREAD 125 select GENERIC_STRNCPY_FROM_USER 126 select GENERIC_STRNLEN_USER 127 select GENERIC_TIME_VSYSCALL 128 select GENERIC_GETTIMEOFDAY | 123 select GENERIC_SMP_IDLE_THREAD 124 select GENERIC_STRNCPY_FROM_USER 125 select GENERIC_STRNLEN_USER 126 select GENERIC_TIME_VSYSCALL 127 select GENERIC_GETTIMEOFDAY |
| 129 select GENERIC_VDSO_TIME_NS | |
| 130 select GUP_GET_PTE_LOW_HIGH if X86_PAE 131 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64 132 select HAVE_ACPI_APEI if ACPI 133 select HAVE_ACPI_APEI_NMI if ACPI 134 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 135 select HAVE_ARCH_AUDITSYSCALL 136 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE 137 select HAVE_ARCH_JUMP_LABEL 138 select HAVE_ARCH_JUMP_LABEL_RELATIVE 139 select HAVE_ARCH_KASAN if X86_64 | 128 select GUP_GET_PTE_LOW_HIGH if X86_PAE 129 select HARDLOCKUP_CHECK_TIMESTAMP if X86_64 130 select HAVE_ACPI_APEI if ACPI 131 select HAVE_ACPI_APEI_NMI if ACPI 132 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 133 select HAVE_ARCH_AUDITSYSCALL 134 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE 135 select HAVE_ARCH_JUMP_LABEL 136 select HAVE_ARCH_JUMP_LABEL_RELATIVE 137 select HAVE_ARCH_KASAN if X86_64 |
| 140 select HAVE_ARCH_KASAN_VMALLOC if X86_64 | |
| 141 select HAVE_ARCH_KGDB 142 select HAVE_ARCH_MMAP_RND_BITS if MMU 143 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT 144 select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT 145 select HAVE_ARCH_PREL32_RELOCATIONS 146 select HAVE_ARCH_SECCOMP_FILTER 147 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 148 select HAVE_ARCH_STACKLEAK --- 7 unchanged lines hidden (view full) --- 156 select HAVE_CMPXCHG_LOCAL 157 select HAVE_CONTEXT_TRACKING if X86_64 158 select HAVE_COPY_THREAD_TLS 159 select HAVE_C_RECORDMCOUNT 160 select HAVE_DEBUG_KMEMLEAK 161 select HAVE_DMA_CONTIGUOUS 162 select HAVE_DYNAMIC_FTRACE 163 select HAVE_DYNAMIC_FTRACE_WITH_REGS | 138 select HAVE_ARCH_KGDB 139 select HAVE_ARCH_MMAP_RND_BITS if MMU 140 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT 141 select HAVE_ARCH_COMPAT_MMAP_BASES if MMU && COMPAT 142 select HAVE_ARCH_PREL32_RELOCATIONS 143 select HAVE_ARCH_SECCOMP_FILTER 144 select HAVE_ARCH_THREAD_STRUCT_WHITELIST 145 select HAVE_ARCH_STACKLEAK --- 7 unchanged lines hidden (view full) --- 153 select HAVE_CMPXCHG_LOCAL 154 select HAVE_CONTEXT_TRACKING if X86_64 155 select HAVE_COPY_THREAD_TLS 156 select HAVE_C_RECORDMCOUNT 157 select HAVE_DEBUG_KMEMLEAK 158 select HAVE_DMA_CONTIGUOUS 159 select HAVE_DYNAMIC_FTRACE 160 select HAVE_DYNAMIC_FTRACE_WITH_REGS |
| 164 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS | |
| 165 select HAVE_EBPF_JIT 166 select HAVE_EFFICIENT_UNALIGNED_ACCESS 167 select HAVE_EISA 168 select HAVE_EXIT_THREAD 169 select HAVE_FAST_GUP 170 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE 171 select HAVE_FTRACE_MCOUNT_RECORD 172 select HAVE_FUNCTION_GRAPH_TRACER --- 25 unchanged lines hidden (view full) --- 198 select HAVE_OPTPROBES 199 select HAVE_PCSPKR_PLATFORM 200 select HAVE_PERF_EVENTS 201 select HAVE_PERF_EVENTS_NMI 202 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI 203 select HAVE_PCI 204 select HAVE_PERF_REGS 205 select HAVE_PERF_USER_STACK_DUMP | 161 select HAVE_EBPF_JIT 162 select HAVE_EFFICIENT_UNALIGNED_ACCESS 163 select HAVE_EISA 164 select HAVE_EXIT_THREAD 165 select HAVE_FAST_GUP 166 select HAVE_FENTRY if X86_64 || DYNAMIC_FTRACE 167 select HAVE_FTRACE_MCOUNT_RECORD 168 select HAVE_FUNCTION_GRAPH_TRACER --- 25 unchanged lines hidden (view full) --- 194 select HAVE_OPTPROBES 195 select HAVE_PCSPKR_PLATFORM 196 select HAVE_PERF_EVENTS 197 select HAVE_PERF_EVENTS_NMI 198 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI 199 select HAVE_PCI 200 select HAVE_PERF_REGS 201 select HAVE_PERF_USER_STACK_DUMP |
| 206 select MMU_GATHER_RCU_TABLE_FREE if PARAVIRT | 202 select HAVE_RCU_TABLE_FREE if PARAVIRT |
| 207 select HAVE_REGS_AND_STACK_ACCESS_API 208 select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION 209 select HAVE_FUNCTION_ARG_ACCESS_API 210 select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR 211 select HAVE_STACK_VALIDATION if X86_64 212 select HAVE_RSEQ 213 select HAVE_SYSCALL_TRACEPOINTS 214 select HAVE_UNSTABLE_SCHED_CLOCK --- 10 unchanged lines hidden (view full) --- 225 select SPARSE_IRQ 226 select SRCU 227 select SYSCTL_EXCEPTION_TRACE 228 select THREAD_INFO_IN_TASK 229 select USER_STACKTRACE_SUPPORT 230 select VIRT_TO_BUS 231 select X86_FEATURE_NAMES if PROC_FS 232 select PROC_PID_ARCH_STATUS if PROC_FS | 203 select HAVE_REGS_AND_STACK_ACCESS_API 204 select HAVE_RELIABLE_STACKTRACE if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION 205 select HAVE_FUNCTION_ARG_ACCESS_API 206 select HAVE_STACKPROTECTOR if CC_HAS_SANE_STACKPROTECTOR 207 select HAVE_STACK_VALIDATION if X86_64 208 select HAVE_RSEQ 209 select HAVE_SYSCALL_TRACEPOINTS 210 select HAVE_UNSTABLE_SCHED_CLOCK --- 10 unchanged lines hidden (view full) --- 221 select SPARSE_IRQ 222 select SRCU 223 select SYSCTL_EXCEPTION_TRACE 224 select THREAD_INFO_IN_TASK 225 select USER_STACKTRACE_SUPPORT 226 select VIRT_TO_BUS 227 select X86_FEATURE_NAMES if PROC_FS 228 select PROC_PID_ARCH_STATUS if PROC_FS |
| 229 select HAVE_ARCH_KCSAN if X86_64 |
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| 233 234config INSTRUCTION_DECODER 235 def_bool y 236 depends on KPROBES || PERF_EVENTS || UPROBES 237 238config OUTPUT_FORMAT 239 string 240 default "elf32-i386" if X86_32 --- 196 unchanged lines hidden (view full) --- 437 bool "Enable MPS table" if ACPI || SFI 438 default y 439 depends on X86_LOCAL_APIC 440 ---help--- 441 For old smp systems that do not have proper acpi support. Newer systems 442 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it 443 444config GOLDFISH | 230 231config INSTRUCTION_DECODER 232 def_bool y 233 depends on KPROBES || PERF_EVENTS || UPROBES 234 235config OUTPUT_FORMAT 236 string 237 default "elf32-i386" if X86_32 --- 196 unchanged lines hidden (view full) --- 434 bool "Enable MPS table" if ACPI || SFI 435 default y 436 depends on X86_LOCAL_APIC 437 ---help--- 438 For old smp systems that do not have proper acpi support. Newer systems 439 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it 440 441config GOLDFISH |
| 445 def_bool y 446 depends on X86_GOLDFISH | 442 def_bool y 443 depends on X86_GOLDFISH |
| 447 448config RETPOLINE 449 bool "Avoid speculative indirect branches in kernel" 450 default y 451 select STACK_VALIDATION if HAVE_STACK_VALIDATION 452 help 453 Compile kernel with the retpoline compiler options to guard against 454 kernel-to-user data leaks by avoiding speculative indirect 455 branches. Requires a compiler with -mindirect-branch=thunk-extern 456 support for full protection. The kernel may run slower. 457 458config X86_CPU_RESCTRL 459 bool "x86 CPU resource control support" 460 depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) 461 select KERNFS | 444 445config RETPOLINE 446 bool "Avoid speculative indirect branches in kernel" 447 default y 448 select STACK_VALIDATION if HAVE_STACK_VALIDATION 449 help 450 Compile kernel with the retpoline compiler options to guard against 451 kernel-to-user data leaks by avoiding speculative indirect 452 branches. Requires a compiler with -mindirect-branch=thunk-extern 453 support for full protection. The kernel may run slower. 454 455config X86_CPU_RESCTRL 456 bool "x86 CPU resource control support" 457 depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) 458 select KERNFS |
| 462 select PROC_CPU_RESCTRL if PROC_FS | |
| 463 help 464 Enable x86 CPU resource control support. 465 466 Provide support for the allocation and monitoring of system resources 467 usage by the CPU. 468 469 Intel calls this Intel Resource Director Technology 470 (Intel(R) RDT). More information about RDT can be found in the --- 5 unchanged lines hidden (view full) --- 476 477 Say N if unsure. 478 479if X86_32 480config X86_BIGSMP 481 bool "Support for big SMP systems with more than 8 CPUs" 482 depends on SMP 483 ---help--- | 459 help 460 Enable x86 CPU resource control support. 461 462 Provide support for the allocation and monitoring of system resources 463 usage by the CPU. 464 465 Intel calls this Intel Resource Director Technology 466 (Intel(R) RDT). More information about RDT can be found in the --- 5 unchanged lines hidden (view full) --- 472 473 Say N if unsure. 474 475if X86_32 476config X86_BIGSMP 477 bool "Support for big SMP systems with more than 8 CPUs" 478 depends on SMP 479 ---help--- |
| 484 This option is needed for the systems that have more than 8 CPUs. | 480 This option is needed for the systems that have more than 8 CPUs |
| 485 486config X86_EXTENDED_PLATFORM 487 bool "Support for extended (non-PC) x86 platforms" 488 default y 489 ---help--- 490 If you disable this option then the kernel will only support 491 standard PC platforms. (which covers the vast majority of 492 systems out there.) --- 67 unchanged lines hidden (view full) --- 560 ---help--- 561 This option is needed in order to support SGI Ultraviolet systems. 562 If you don't have one of these, you should say N here. 563 564# Following is an alphabetically sorted list of 32 bit extended platforms 565# Please maintain the alphabetic order if and when there are additions 566 567config X86_GOLDFISH | 481 482config X86_EXTENDED_PLATFORM 483 bool "Support for extended (non-PC) x86 platforms" 484 default y 485 ---help--- 486 If you disable this option then the kernel will only support 487 standard PC platforms. (which covers the vast majority of 488 systems out there.) --- 67 unchanged lines hidden (view full) --- 556 ---help--- 557 This option is needed in order to support SGI Ultraviolet systems. 558 If you don't have one of these, you should say N here. 559 560# Following is an alphabetically sorted list of 32 bit extended platforms 561# Please maintain the alphabetic order if and when there are additions 562 563config X86_GOLDFISH |
| 568 bool "Goldfish (Virtual Platform)" 569 depends on X86_EXTENDED_PLATFORM 570 ---help--- | 564 bool "Goldfish (Virtual Platform)" 565 depends on X86_EXTENDED_PLATFORM 566 ---help--- |
| 571 Enable support for the Goldfish virtual platform used primarily 572 for Android development. Unless you are building for the Android 573 Goldfish emulator say N here. 574 575config X86_INTEL_CE 576 bool "CE4100 TV platform" 577 depends on PCI 578 depends on PCI_GODIRECT --- 129 unchanged lines hidden (view full) --- 708 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: 709 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: 710 depends on X86_64 || !SPARSEMEM 711 select ARCH_SUPPORTS_MEMORY_FAILURE 712 713config STA2X11 714 bool "STA2X11 Companion Chip Support" 715 depends on X86_32_NON_STANDARD && PCI | 567 Enable support for the Goldfish virtual platform used primarily 568 for Android development. Unless you are building for the Android 569 Goldfish emulator say N here. 570 571config X86_INTEL_CE 572 bool "CE4100 TV platform" 573 depends on PCI 574 depends on PCI_GODIRECT --- 129 unchanged lines hidden (view full) --- 704 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags: 705 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH: 706 depends on X86_64 || !SPARSEMEM 707 select ARCH_SUPPORTS_MEMORY_FAILURE 708 709config STA2X11 710 bool "STA2X11 Companion Chip Support" 711 depends on X86_32_NON_STANDARD && PCI |
| 712 select ARCH_HAS_PHYS_TO_DMA |
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| 716 select SWIOTLB 717 select MFD_STA2X11 718 select GPIOLIB 719 ---help--- 720 This adds support for boards based on the STA2X11 IO-Hub, 721 a.k.a. "ConneXt". The chip is used in place of the standard 722 PC chipset, so all "standard" peripherals are missing. If this 723 option is selected the kernel will still be able to boot on --- 81 unchanged lines hidden (view full) --- 805 ---help--- 806 This option enables various optimizations for running under the KVM 807 hypervisor. It includes a paravirtualized clock, so that instead 808 of relying on a PIT (or probably other) emulation by the 809 underlying device model, the host provides the guest with 810 timing infrastructure such as time of day, and system time 811 812config ARCH_CPUIDLE_HALTPOLL | 713 select SWIOTLB 714 select MFD_STA2X11 715 select GPIOLIB 716 ---help--- 717 This adds support for boards based on the STA2X11 IO-Hub, 718 a.k.a. "ConneXt". The chip is used in place of the standard 719 PC chipset, so all "standard" peripherals are missing. If this 720 option is selected the kernel will still be able to boot on --- 81 unchanged lines hidden (view full) --- 802 ---help--- 803 This option enables various optimizations for running under the KVM 804 hypervisor. It includes a paravirtualized clock, so that instead 805 of relying on a PIT (or probably other) emulation by the 806 underlying device model, the host provides the guest with 807 timing infrastructure such as time of day, and system time 808 809config ARCH_CPUIDLE_HALTPOLL |
| 813 def_bool n 814 prompt "Disable host haltpoll when loading haltpoll driver" 815 help | 810 def_bool n 811 prompt "Disable host haltpoll when loading haltpoll driver" 812 help |
| 816 If virtualized under KVM, disable host haltpoll. 817 818config PVH 819 bool "Support for running PVH guests" 820 ---help--- 821 This option enables the PVH entry point for guest virtual machines 822 as specified in the x86/HVM direct boot ABI. 823 --- 62 unchanged lines hidden (view full) --- 886 887 Choose N to continue using the legacy 8254 timer. 888 889config HPET_EMULATE_RTC 890 def_bool y 891 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) 892 893config APB_TIMER | 813 If virtualized under KVM, disable host haltpoll. 814 815config PVH 816 bool "Support for running PVH guests" 817 ---help--- 818 This option enables the PVH entry point for guest virtual machines 819 as specified in the x86/HVM direct boot ABI. 820 --- 62 unchanged lines hidden (view full) --- 883 884 Choose N to continue using the legacy 8254 timer. 885 886config HPET_EMULATE_RTC 887 def_bool y 888 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y) 889 890config APB_TIMER |
| 894 def_bool y if X86_INTEL_MID 895 prompt "Intel MID APB Timer Support" if X86_INTEL_MID 896 select DW_APB_TIMER 897 depends on X86_INTEL_MID && SFI 898 help 899 APB timer is the replacement for 8254, HPET on X86 MID platforms. 900 The APBT provides a stable time base on SMP 901 systems, unlike the TSC, but it is more expensive to access, 902 as it is off-chip. APB timers are always running regardless of CPU 903 C states, they are used as per CPU clockevent device when possible. | 891 def_bool y if X86_INTEL_MID 892 prompt "Intel MID APB Timer Support" if X86_INTEL_MID 893 select DW_APB_TIMER 894 depends on X86_INTEL_MID && SFI 895 help 896 APB timer is the replacement for 8254, HPET on X86 MID platforms. 897 The APBT provides a stable time base on SMP 898 systems, unlike the TSC, but it is more expensive to access, 899 as it is off-chip. APB timers are always running regardless of CPU 900 C states, they are used as per CPU clockevent device when possible. |
| 904 905# Mark as expert because too many people got it wrong. 906# The code disables itself when not needed. 907config DMI 908 default y 909 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 910 bool "Enable DMI scanning" if EXPERT 911 ---help--- --- 19 unchanged lines hidden (view full) --- 931 the CONFIG_AMD_IOMMU=y config option. 932 933 In normal configurations this driver is only active when needed: 934 there's more than 3 GB of memory and the system contains a 935 32-bit limited device. 936 937 If unsure, say Y. 938 | 901 902# Mark as expert because too many people got it wrong. 903# The code disables itself when not needed. 904config DMI 905 default y 906 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 907 bool "Enable DMI scanning" if EXPERT 908 ---help--- --- 19 unchanged lines hidden (view full) --- 928 the CONFIG_AMD_IOMMU=y config option. 929 930 In normal configurations this driver is only active when needed: 931 there's more than 3 GB of memory and the system contains a 932 32-bit limited device. 933 934 If unsure, say Y. 935 |
| 936config CALGARY_IOMMU 937 bool "IBM Calgary IOMMU support" 938 select IOMMU_HELPER 939 select SWIOTLB 940 depends on X86_64 && PCI 941 ---help--- 942 Support for hardware IOMMUs in IBM's xSeries x366 and x460 943 systems. Needed to run systems with more than 3GB of memory 944 properly with 32-bit PCI devices that do not support DAC 945 (Double Address Cycle). Calgary also supports bus level 946 isolation, where all DMAs pass through the IOMMU. This 947 prevents them from going anywhere except their intended 948 destination. This catches hard-to-find kernel bugs and 949 mis-behaving drivers and devices that do not use the DMA-API 950 properly to set up their DMA buffers. The IOMMU can be 951 turned off at boot time with the iommu=off parameter. 952 Normally the kernel will make the right choice by itself. 953 If unsure, say Y. 954 955config CALGARY_IOMMU_ENABLED_BY_DEFAULT 956 def_bool y 957 prompt "Should Calgary be enabled by default?" 958 depends on CALGARY_IOMMU 959 ---help--- 960 Should Calgary be enabled by default? if you choose 'y', Calgary 961 will be used (if it exists). If you choose 'n', Calgary will not be 962 used even if it exists. If you choose 'n' and would like to use 963 Calgary anyway, pass 'iommu=calgary' on the kernel command line. 964 If unsure, say Y. 965 |
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| 939config MAXSMP 940 bool "Enable Maximum number of SMP Processors and NUMA Nodes" 941 depends on X86_64 && SMP && DEBUG_KERNEL 942 select CPUMASK_OFFSTACK 943 ---help--- 944 Enable maximum number of CPUS and NUMA Nodes for this architecture. 945 If unsure, say N. 946 --- 22 unchanged lines hidden (view full) --- 969 depends on X86_32 970 default 64 if SMP && X86_BIGSMP 971 default 8 if SMP && !X86_BIGSMP 972 default 1 if !SMP 973 974config NR_CPUS_RANGE_END 975 int 976 depends on X86_64 | 966config MAXSMP 967 bool "Enable Maximum number of SMP Processors and NUMA Nodes" 968 depends on X86_64 && SMP && DEBUG_KERNEL 969 select CPUMASK_OFFSTACK 970 ---help--- 971 Enable maximum number of CPUS and NUMA Nodes for this architecture. 972 If unsure, say N. 973 --- 22 unchanged lines hidden (view full) --- 996 depends on X86_32 997 default 64 if SMP && X86_BIGSMP 998 default 8 if SMP && !X86_BIGSMP 999 default 1 if !SMP 1000 1001config NR_CPUS_RANGE_END 1002 int 1003 depends on X86_64 |
| 977 default 8192 if SMP && CPUMASK_OFFSTACK 978 default 512 if SMP && !CPUMASK_OFFSTACK | 1004 default 8192 if SMP && ( MAXSMP || CPUMASK_OFFSTACK) 1005 default 512 if SMP && (!MAXSMP && !CPUMASK_OFFSTACK) |
| 979 default 1 if !SMP 980 981config NR_CPUS_DEFAULT 982 int 983 depends on X86_32 984 default 32 if X86_BIGSMP 985 default 8 if SMP 986 default 1 if !SMP --- 47 unchanged lines hidden (view full) --- 1034 scheduler's CPU selection logic accordingly, so that higher 1035 overall system performance can be achieved. 1036 1037 This feature will have no effect on CPUs without this feature. 1038 1039 If unsure say Y here. 1040 1041config UP_LATE_INIT | 1006 default 1 if !SMP 1007 1008config NR_CPUS_DEFAULT 1009 int 1010 depends on X86_32 1011 default 32 if X86_BIGSMP 1012 default 8 if SMP 1013 default 1 if !SMP --- 47 unchanged lines hidden (view full) --- 1061 scheduler's CPU selection logic accordingly, so that higher 1062 overall system performance can be achieved. 1063 1064 This feature will have no effect on CPUs without this feature. 1065 1066 If unsure say Y here. 1067 1068config UP_LATE_INIT |
| 1042 def_bool y 1043 depends on !SMP && X86_LOCAL_APIC | 1069 def_bool y 1070 depends on !SMP && X86_LOCAL_APIC |
| 1044 1045config X86_UP_APIC 1046 bool "Local APIC support on uniprocessors" if !PCI_MSI 1047 default PCI_MSI 1048 depends on X86_32 && !SMP && !X86_32_NON_STANDARD 1049 ---help--- 1050 A local APIC (Advanced Programmable Interrupt Controller) is an 1051 integrated interrupt controller in the CPU. If you have a single-CPU --- 132 unchanged lines hidden (view full) --- 1184 mode and is not needed to run most 16-bit programs under Wine. 1185 1186 Enabling this option increases the complexity of the kernel 1187 and slows down exception handling a tiny bit. 1188 1189 If unsure, say N here. 1190 1191config VM86 | 1071 1072config X86_UP_APIC 1073 bool "Local APIC support on uniprocessors" if !PCI_MSI 1074 default PCI_MSI 1075 depends on X86_32 && !SMP && !X86_32_NON_STANDARD 1076 ---help--- 1077 A local APIC (Advanced Programmable Interrupt Controller) is an 1078 integrated interrupt controller in the CPU. If you have a single-CPU --- 132 unchanged lines hidden (view full) --- 1211 mode and is not needed to run most 16-bit programs under Wine. 1212 1213 Enabling this option increases the complexity of the kernel 1214 and slows down exception handling a tiny bit. 1215 1216 If unsure, say N here. 1217 1218config VM86 |
| 1192 bool 1193 default X86_LEGACY_VM86 | 1219 bool 1220 default X86_LEGACY_VM86 |
| 1194 1195config X86_16BIT 1196 bool "Enable support for 16-bit segments" if EXPERT 1197 default y 1198 depends on MODIFY_LDT_SYSCALL 1199 ---help--- 1200 This option is required by programs like Wine to run 16-bit 1201 protected mode legacy code on x86 processors. Disabling --- 4 unchanged lines hidden (view full) --- 1206 def_bool y 1207 depends on X86_16BIT && X86_32 1208 1209config X86_ESPFIX64 1210 def_bool y 1211 depends on X86_16BIT && X86_64 1212 1213config X86_VSYSCALL_EMULATION | 1221 1222config X86_16BIT 1223 bool "Enable support for 16-bit segments" if EXPERT 1224 default y 1225 depends on MODIFY_LDT_SYSCALL 1226 ---help--- 1227 This option is required by programs like Wine to run 16-bit 1228 protected mode legacy code on x86 processors. Disabling --- 4 unchanged lines hidden (view full) --- 1233 def_bool y 1234 depends on X86_16BIT && X86_32 1235 1236config X86_ESPFIX64 1237 def_bool y 1238 depends on X86_16BIT && X86_64 1239 1240config X86_VSYSCALL_EMULATION |
| 1214 bool "Enable vsyscall emulation" if EXPERT 1215 default y 1216 depends on X86_64 1217 ---help--- | 1241 bool "Enable vsyscall emulation" if EXPERT 1242 default y 1243 depends on X86_64 1244 ---help--- |
| 1218 This enables emulation of the legacy vsyscall page. Disabling 1219 it is roughly equivalent to booting with vsyscall=none, except 1220 that it will also disable the helpful warning if a program 1221 tries to use a vsyscall. With this option set to N, offending 1222 programs will just segfault, citing addresses of the form 1223 0xffffffffff600?00. 1224 1225 This option is required by many programs built before 2013, and 1226 care should be used even with newer programs if set to N. 1227 1228 Disabling this option saves about 7K of kernel size and 1229 possibly 4K of additional runtime pagetable memory. 1230 | 1245 This enables emulation of the legacy vsyscall page. Disabling 1246 it is roughly equivalent to booting with vsyscall=none, except 1247 that it will also disable the helpful warning if a program 1248 tries to use a vsyscall. With this option set to N, offending 1249 programs will just segfault, citing addresses of the form 1250 0xffffffffff600?00. 1251 1252 This option is required by many programs built before 2013, and 1253 care should be used even with newer programs if set to N. 1254 1255 Disabling this option saves about 7K of kernel size and 1256 possibly 4K of additional runtime pagetable memory. 1257 |
| 1231config X86_IOPL_IOPERM 1232 bool "IOPERM and IOPL Emulation" 1233 default y 1234 ---help--- 1235 This enables the ioperm() and iopl() syscalls which are necessary 1236 for legacy applications. 1237 1238 Legacy IOPL support is an overbroad mechanism which allows user 1239 space aside of accessing all 65536 I/O ports also to disable 1240 interrupts. To gain this access the caller needs CAP_SYS_RAWIO 1241 capabilities and permission from potentially active security 1242 modules. 1243 1244 The emulation restricts the functionality of the syscall to 1245 only allowing the full range I/O port access, but prevents the 1246 ability to disable interrupts from user space which would be 1247 granted if the hardware IOPL mechanism would be used. 1248 | |
| 1249config TOSHIBA 1250 tristate "Toshiba Laptop support" 1251 depends on X86_32 1252 ---help--- 1253 This adds a driver to safely access the System Management Mode of 1254 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does 1255 not work on models with a Phoenix BIOS. The System Management Mode 1256 is used to set the BIOS and power saving options on Toshiba portables. --- 222 unchanged lines hidden (view full) --- 1479 ---help--- 1480 PAE is required for NX support, and furthermore enables 1481 larger swapspace support for non-overcommit purposes. It 1482 has the cost of more pagetable lookup overhead, and also 1483 consumes more pagetable space per process. 1484 1485config X86_5LEVEL 1486 bool "Enable 5-level page tables support" | 1258config TOSHIBA 1259 tristate "Toshiba Laptop support" 1260 depends on X86_32 1261 ---help--- 1262 This adds a driver to safely access the System Management Mode of 1263 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does 1264 not work on models with a Phoenix BIOS. The System Management Mode 1265 is used to set the BIOS and power saving options on Toshiba portables. --- 222 unchanged lines hidden (view full) --- 1488 ---help--- 1489 PAE is required for NX support, and furthermore enables 1490 larger swapspace support for non-overcommit purposes. It 1491 has the cost of more pagetable lookup overhead, and also 1492 consumes more pagetable space per process. 1493 1494config X86_5LEVEL 1495 bool "Enable 5-level page tables support" |
| 1487 default y | |
| 1488 select DYNAMIC_MEMORY_LAYOUT 1489 select SPARSEMEM_VMEMMAP 1490 depends on X86_64 1491 ---help--- 1492 5-level paging enables access to larger address space: 1493 upto 128 PiB of virtual address space and 4 PiB of 1494 physical address space. 1495 --- 15 unchanged lines hidden (view full) --- 1511 linear 1 GB mappings (even if the CPU otherwise 1512 supports them), so don't confuse the user by printing 1513 that we have them enabled. 1514 1515config X86_CPA_STATISTICS 1516 bool "Enable statistic for Change Page Attribute" 1517 depends on DEBUG_FS 1518 ---help--- | 1496 select DYNAMIC_MEMORY_LAYOUT 1497 select SPARSEMEM_VMEMMAP 1498 depends on X86_64 1499 ---help--- 1500 5-level paging enables access to larger address space: 1501 upto 128 PiB of virtual address space and 4 PiB of 1502 physical address space. 1503 --- 15 unchanged lines hidden (view full) --- 1519 linear 1 GB mappings (even if the CPU otherwise 1520 supports them), so don't confuse the user by printing 1521 that we have them enabled. 1522 1523config X86_CPA_STATISTICS 1524 bool "Enable statistic for Change Page Attribute" 1525 depends on DEBUG_FS 1526 ---help--- |
| 1519 Expose statistics about the Change Page Attribute mechanism, which | 1527 Expose statistics about the Change Page Attribute mechanims, which |
| 1520 helps to determine the effectiveness of preserving large and huge 1521 page mappings when mapping protections are changed. 1522 1523config AMD_MEM_ENCRYPT 1524 bool "AMD Secure Memory Encryption (SME) support" 1525 depends on X86_64 && CPU_SUP_AMD 1526 select DYNAMIC_PHYSICAL_MASK 1527 select ARCH_USE_MEMREMAP_PROT --- 14 unchanged lines hidden (view full) --- 1542 If set to Y, then the encryption of system memory can be 1543 deactivated with the mem_encrypt=off command line option. 1544 1545 If set to N, then the encryption of system memory can be 1546 activated with the mem_encrypt=on command line option. 1547 1548# Common NUMA Features 1549config NUMA | 1528 helps to determine the effectiveness of preserving large and huge 1529 page mappings when mapping protections are changed. 1530 1531config AMD_MEM_ENCRYPT 1532 bool "AMD Secure Memory Encryption (SME) support" 1533 depends on X86_64 && CPU_SUP_AMD 1534 select DYNAMIC_PHYSICAL_MASK 1535 select ARCH_USE_MEMREMAP_PROT --- 14 unchanged lines hidden (view full) --- 1550 If set to Y, then the encryption of system memory can be 1551 deactivated with the mem_encrypt=off command line option. 1552 1553 If set to N, then the encryption of system memory can be 1554 activated with the mem_encrypt=on command line option. 1555 1556# Common NUMA Features 1557config NUMA |
| 1550 bool "NUMA Memory Allocation and Scheduler Support" | 1558 bool "Numa Memory Allocation and Scheduler Support" |
| 1551 depends on SMP 1552 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) 1553 default y if X86_BIGSMP 1554 ---help--- | 1559 depends on SMP 1560 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP) 1561 default y if X86_BIGSMP 1562 ---help--- |
| 1555 Enable NUMA (Non-Uniform Memory Access) support. | 1563 Enable NUMA (Non Uniform Memory Access) support. |
| 1556 1557 The kernel will try to allocate memory used by a CPU on the 1558 local memory controller of the CPU and add some more 1559 NUMA awareness to the kernel. 1560 1561 For 64-bit this is recommended if the system is Intel Core i7 1562 (or later), AMD Opteron, or EM64T NUMA. 1563 --- 83 unchanged lines hidden (view full) --- 1647 See Documentation/admin-guide/mm/memory-hotplug.rst for more information. 1648 If you are unsure how to answer this question, answer N. 1649 1650config ARCH_PROC_KCORE_TEXT 1651 def_bool y 1652 depends on X86_64 && PROC_KCORE 1653 1654config ILLEGAL_POINTER_VALUE | 1564 1565 The kernel will try to allocate memory used by a CPU on the 1566 local memory controller of the CPU and add some more 1567 NUMA awareness to the kernel. 1568 1569 For 64-bit this is recommended if the system is Intel Core i7 1570 (or later), AMD Opteron, or EM64T NUMA. 1571 --- 83 unchanged lines hidden (view full) --- 1655 See Documentation/admin-guide/mm/memory-hotplug.rst for more information. 1656 If you are unsure how to answer this question, answer N. 1657 1658config ARCH_PROC_KCORE_TEXT 1659 def_bool y 1660 depends on X86_64 && PROC_KCORE 1661 1662config ILLEGAL_POINTER_VALUE |
| 1655 hex 1656 default 0 if X86_32 1657 default 0xdead000000000000 if X86_64 | 1663 hex 1664 default 0 if X86_32 1665 default 0xdead000000000000 if X86_64 |
| 1658 1659config X86_PMEM_LEGACY_DEVICE 1660 bool 1661 1662config X86_PMEM_LEGACY 1663 tristate "Support non-standard NVDIMMs and ADR protected memory" 1664 depends on PHYS_ADDR_T_64BIT 1665 depends on BLK_DEV --- 73 unchanged lines hidden (view full) --- 1739 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check 1740 typical corruption patterns. 1741 1742 Leave this to the default value of 64 if you are unsure. 1743 1744config MATH_EMULATION 1745 bool 1746 depends on MODIFY_LDT_SYSCALL | 1666 1667config X86_PMEM_LEGACY_DEVICE 1668 bool 1669 1670config X86_PMEM_LEGACY 1671 tristate "Support non-standard NVDIMMs and ADR protected memory" 1672 depends on PHYS_ADDR_T_64BIT 1673 depends on BLK_DEV --- 73 unchanged lines hidden (view full) --- 1747 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check 1748 typical corruption patterns. 1749 1750 Leave this to the default value of 64 if you are unsure. 1751 1752config MATH_EMULATION 1753 bool 1754 depends on MODIFY_LDT_SYSCALL |
| 1747 prompt "Math emulation" if X86_32 && (M486SX || MELAN) | 1755 prompt "Math emulation" if X86_32 |
| 1748 ---help--- 1749 Linux can emulate a math coprocessor (used for floating point 1750 operations) if you don't have one. 486DX and Pentium processors have 1751 a math coprocessor built in, 486SX and 386 do not, unless you added 1752 a 487DX or 387, respectively. (The messages during boot time can 1753 give you some hints here ["man dmesg"].) Everyone needs either a 1754 coprocessor or this emulation. 1755 --- 112 unchanged lines hidden (view full) --- 1868 ---help--- 1869 Supervisor Mode Access Prevention (SMAP) is a security 1870 feature in newer Intel processors. There is a small 1871 performance cost if this enabled and turned on; there is 1872 also a small increase in the kernel size if this is enabled. 1873 1874 If unsure, say Y. 1875 | 1756 ---help--- 1757 Linux can emulate a math coprocessor (used for floating point 1758 operations) if you don't have one. 486DX and Pentium processors have 1759 a math coprocessor built in, 486SX and 386 do not, unless you added 1760 a 487DX or 387, respectively. (The messages during boot time can 1761 give you some hints here ["man dmesg"].) Everyone needs either a 1762 coprocessor or this emulation. 1763 --- 112 unchanged lines hidden (view full) --- 1876 ---help--- 1877 Supervisor Mode Access Prevention (SMAP) is a security 1878 feature in newer Intel processors. There is a small 1879 performance cost if this enabled and turned on; there is 1880 also a small increase in the kernel size if this is enabled. 1881 1882 If unsure, say Y. 1883 |
| 1876config X86_UMIP | 1884config X86_INTEL_UMIP |
| 1877 def_bool y | 1885 def_bool y |
| 1878 depends on CPU_SUP_INTEL || CPU_SUP_AMD 1879 prompt "User Mode Instruction Prevention" if EXPERT | 1886 depends on CPU_SUP_INTEL 1887 prompt "Intel User Mode Instruction Prevention" if EXPERT |
| 1880 ---help--- | 1888 ---help--- |
| 1881 User Mode Instruction Prevention (UMIP) is a security feature in 1882 some x86 processors. If enabled, a general protection fault is 1883 issued if the SGDT, SLDT, SIDT, SMSW or STR instructions are 1884 executed in user mode. These instructions unnecessarily expose 1885 information about the hardware state. | 1889 The User Mode Instruction Prevention (UMIP) is a security 1890 feature in newer Intel processors. If enabled, a general 1891 protection fault is issued if the SGDT, SLDT, SIDT, SMSW 1892 or STR instructions are executed in user mode. These instructions 1893 unnecessarily expose information about the hardware state. |
| 1886 1887 The vast majority of applications do not use these instructions. 1888 For the very few that do, software emulation is provided in 1889 specific cases in protected and virtual-8086 modes. Emulated 1890 results are dummy. 1891 | 1894 1895 The vast majority of applications do not use these instructions. 1896 For the very few that do, software emulation is provided in 1897 specific cases in protected and virtual-8086 modes. Emulated 1898 results are dummy. 1899 |
| 1900config X86_INTEL_MPX 1901 prompt "Intel MPX (Memory Protection Extensions)" 1902 def_bool n 1903 # Note: only available in 64-bit mode due to VMA flags shortage 1904 depends on CPU_SUP_INTEL && X86_64 1905 select ARCH_USES_HIGH_VMA_FLAGS 1906 ---help--- 1907 MPX provides hardware features that can be used in 1908 conjunction with compiler-instrumented code to check 1909 memory references. It is designed to detect buffer 1910 overflow or underflow bugs. 1911 1912 This option enables running applications which are 1913 instrumented or otherwise use MPX. It does not use MPX 1914 itself inside the kernel or to protect the kernel 1915 against bad memory references. 1916 1917 Enabling this option will make the kernel larger: 1918 ~8k of kernel text and 36 bytes of data on a 64-bit 1919 defconfig. It adds a long to the 'mm_struct' which 1920 will increase the kernel memory overhead of each 1921 process and adds some branches to paths used during 1922 exec() and munmap(). 1923 1924 For details, see Documentation/x86/intel_mpx.rst 1925 1926 If unsure, say N. 1927 |
|
| 1892config X86_INTEL_MEMORY_PROTECTION_KEYS 1893 prompt "Intel Memory Protection Keys" 1894 def_bool y 1895 # Note: only available in 64-bit mode 1896 depends on CPU_SUP_INTEL && X86_64 1897 select ARCH_USES_HIGH_VMA_FLAGS 1898 select ARCH_HAS_PKEYS 1899 ---help--- 1900 Memory Protection Keys provides a mechanism for enforcing 1901 page-based protections, but without requiring modification of the 1902 page tables when an application changes protection domains. 1903 1904 For details, see Documentation/core-api/protection-keys.rst 1905 1906 If unsure, say y. 1907 | 1928config X86_INTEL_MEMORY_PROTECTION_KEYS 1929 prompt "Intel Memory Protection Keys" 1930 def_bool y 1931 # Note: only available in 64-bit mode 1932 depends on CPU_SUP_INTEL && X86_64 1933 select ARCH_USES_HIGH_VMA_FLAGS 1934 select ARCH_HAS_PKEYS 1935 ---help--- 1936 Memory Protection Keys provides a mechanism for enforcing 1937 page-based protections, but without requiring modification of the 1938 page tables when an application changes protection domains. 1939 1940 For details, see Documentation/core-api/protection-keys.rst 1941 1942 If unsure, say y. 1943 |
| 1908choice 1909 prompt "TSX enable mode" 1910 depends on CPU_SUP_INTEL 1911 default X86_INTEL_TSX_MODE_OFF 1912 help 1913 Intel's TSX (Transactional Synchronization Extensions) feature 1914 allows to optimize locking protocols through lock elision which 1915 can lead to a noticeable performance boost. 1916 1917 On the other hand it has been shown that TSX can be exploited 1918 to form side channel attacks (e.g. TAA) and chances are there 1919 will be more of those attacks discovered in the future. 1920 1921 Therefore TSX is not enabled by default (aka tsx=off). An admin 1922 might override this decision by tsx=on the command line parameter. 1923 Even with TSX enabled, the kernel will attempt to enable the best 1924 possible TAA mitigation setting depending on the microcode available 1925 for the particular machine. 1926 1927 This option allows to set the default tsx mode between tsx=on, =off 1928 and =auto. See Documentation/admin-guide/kernel-parameters.txt for more 1929 details. 1930 1931 Say off if not sure, auto if TSX is in use but it should be used on safe 1932 platforms or on if TSX is in use and the security aspect of tsx is not 1933 relevant. 1934 1935config X86_INTEL_TSX_MODE_OFF 1936 bool "off" 1937 help 1938 TSX is disabled if possible - equals to tsx=off command line parameter. 1939 1940config X86_INTEL_TSX_MODE_ON 1941 bool "on" 1942 help 1943 TSX is always enabled on TSX capable HW - equals the tsx=on command 1944 line parameter. 1945 1946config X86_INTEL_TSX_MODE_AUTO 1947 bool "auto" 1948 help 1949 TSX is enabled on TSX capable HW that is believed to be safe against 1950 side channel attacks- equals the tsx=auto command line parameter. 1951endchoice 1952 | |
| 1953config EFI 1954 bool "EFI runtime service support" 1955 depends on ACPI 1956 select UCS2_STRING 1957 select EFI_RUNTIME_WRAPPERS 1958 ---help--- 1959 This enables the kernel to use EFI runtime services that are 1960 available (such as the EFI variable services). 1961 1962 This option is only useful on systems that have EFI firmware. 1963 In addition, you should use the latest ELILO loader available 1964 at <http://elilo.sourceforge.net> in order to take advantage 1965 of EFI runtime services. However, even with this option, the 1966 resultant kernel should continue to boot on existing non-EFI 1967 platforms. 1968 1969config EFI_STUB | 1944config EFI 1945 bool "EFI runtime service support" 1946 depends on ACPI 1947 select UCS2_STRING 1948 select EFI_RUNTIME_WRAPPERS 1949 ---help--- 1950 This enables the kernel to use EFI runtime services that are 1951 available (such as the EFI variable services). 1952 1953 This option is only useful on systems that have EFI firmware. 1954 In addition, you should use the latest ELILO loader available 1955 at <http://elilo.sourceforge.net> in order to take advantage 1956 of EFI runtime services. However, even with this option, the 1957 resultant kernel should continue to boot on existing non-EFI 1958 platforms. 1959 1960config EFI_STUB |
| 1970 bool "EFI stub support" 1971 depends on EFI && !X86_USE_3DNOW 1972 depends on $(cc-option,-mabi=ms) || X86_32 1973 select RELOCATABLE 1974 ---help--- 1975 This kernel feature allows a bzImage to be loaded directly | 1961 bool "EFI stub support" 1962 depends on EFI && !X86_USE_3DNOW 1963 select RELOCATABLE 1964 ---help--- 1965 This kernel feature allows a bzImage to be loaded directly |
| 1976 by EFI firmware without the use of a bootloader. 1977 1978 See Documentation/admin-guide/efi-stub.rst for more information. 1979 1980config EFI_MIXED 1981 bool "EFI mixed-mode support" 1982 depends on EFI_STUB && X86_64 1983 ---help--- --- 943 unchanged lines hidden (view full) --- 2927 2928endmenu 2929 2930 2931config HAVE_ATOMIC_IOMAP 2932 def_bool y 2933 depends on X86_32 2934 | 1966 by EFI firmware without the use of a bootloader. 1967 1968 See Documentation/admin-guide/efi-stub.rst for more information. 1969 1970config EFI_MIXED 1971 bool "EFI mixed-mode support" 1972 depends on EFI_STUB && X86_64 1973 ---help--- --- 943 unchanged lines hidden (view full) --- 2917 2918endmenu 2919 2920 2921config HAVE_ATOMIC_IOMAP 2922 def_bool y 2923 depends on X86_32 2924 |
| 2925config X86_DEV_DMA_OPS 2926 bool 2927 |
|
| 2935source "drivers/firmware/Kconfig" 2936 2937source "arch/x86/kvm/Kconfig" | 2928source "drivers/firmware/Kconfig" 2929 2930source "arch/x86/kvm/Kconfig" |