mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 06:46:41 +07:00
8fe88a4145
The RANDOMIZE_MODULE_REGION_FULL Kconfig option allows KASLR to be configured in such a way that kernel modules and the core kernel are allocated completely independently, which implies that modules are likely to require branches via PLT entries to reach the core kernel. The dynamic ftrace code does not expect that, and assumes that it can patch module code to perform a relative branch to anywhere in the core kernel. This may result in errors such as branch_imm_common: offset out of range ------------[ cut here ]------------ WARNING: CPU: 3 PID: 196 at kernel/trace/ftrace.c:1995 ftrace_bug+0x220/0x2e8 Modules linked in: CPU: 3 PID: 196 Comm: systemd-udevd Not tainted 4.8.0-22-generic #24 Hardware name: AMD Seattle/Seattle, BIOS 10:34:40 Oct 6 2016 task: ffff8d1bef7dde80 task.stack: ffff8d1bef6b0000 PC is at ftrace_bug+0x220/0x2e8 LR is at ftrace_process_locs+0x330/0x430 So make RANDOMIZE_MODULE_REGION_FULL mutually exclusive with DYNAMIC_FTRACE at the Kconfig level. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
1069 lines
31 KiB
Plaintext
1069 lines
31 KiB
Plaintext
config ARM64
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def_bool y
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select ACPI_CCA_REQUIRED if ACPI
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select ACPI_GENERIC_GSI if ACPI
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select ACPI_REDUCED_HARDWARE_ONLY if ACPI
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select ACPI_MCFG if ACPI
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select ACPI_SPCR_TABLE if ACPI
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select ARCH_CLOCKSOURCE_DATA
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select ARCH_HAS_DEVMEM_IS_ALLOWED
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select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
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select ARCH_HAS_ELF_RANDOMIZE
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select ARCH_HAS_GCOV_PROFILE_ALL
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select ARCH_HAS_GIGANTIC_PAGE
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select ARCH_HAS_KCOV
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select ARCH_HAS_SG_CHAIN
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select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
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select ARCH_USE_CMPXCHG_LOCKREF
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select ARCH_SUPPORTS_ATOMIC_RMW
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select ARCH_SUPPORTS_NUMA_BALANCING
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select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
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select ARCH_WANT_FRAME_POINTERS
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select ARCH_HAS_UBSAN_SANITIZE_ALL
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select ARM_AMBA
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select ARM_ARCH_TIMER
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select ARM_GIC
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select AUDIT_ARCH_COMPAT_GENERIC
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select ARM_GIC_V2M if PCI
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select ARM_GIC_V3
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select ARM_GIC_V3_ITS if PCI
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select ARM_PSCI_FW
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select BUILDTIME_EXTABLE_SORT
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select CLONE_BACKWARDS
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select COMMON_CLK
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select CPU_PM if (SUSPEND || CPU_IDLE)
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select DCACHE_WORD_ACCESS
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select EDAC_SUPPORT
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select FRAME_POINTER
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select GENERIC_ALLOCATOR
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select GENERIC_CLOCKEVENTS
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select GENERIC_CLOCKEVENTS_BROADCAST
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select GENERIC_CPU_AUTOPROBE
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select GENERIC_EARLY_IOREMAP
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select GENERIC_IDLE_POLL_SETUP
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select GENERIC_IRQ_PROBE
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select GENERIC_IRQ_SHOW
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select GENERIC_IRQ_SHOW_LEVEL
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select GENERIC_PCI_IOMAP
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_STRNCPY_FROM_USER
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select GENERIC_STRNLEN_USER
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select GENERIC_TIME_VSYSCALL
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select HANDLE_DOMAIN_IRQ
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select HARDIRQS_SW_RESEND
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select HAVE_ALIGNED_STRUCT_PAGE if SLUB
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select HAVE_ARCH_AUDITSYSCALL
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select HAVE_ARCH_BITREVERSE
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select HAVE_ARCH_HARDENED_USERCOPY
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select HAVE_ARCH_HUGE_VMAP
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select HAVE_ARCH_JUMP_LABEL
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select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP && !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
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select HAVE_ARCH_KGDB
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select HAVE_ARCH_MMAP_RND_BITS
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select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
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select HAVE_ARCH_SECCOMP_FILTER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ARCH_TRANSPARENT_HUGEPAGE
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select HAVE_ARM_SMCCC
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select HAVE_EBPF_JIT
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select HAVE_C_RECORDMCOUNT
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select HAVE_CC_STACKPROTECTOR
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select HAVE_CMPXCHG_DOUBLE
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select HAVE_CMPXCHG_LOCAL
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select HAVE_CONTEXT_TRACKING
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select HAVE_DEBUG_BUGVERBOSE
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select HAVE_DEBUG_KMEMLEAK
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select HAVE_DMA_API_DEBUG
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select HAVE_DMA_CONTIGUOUS
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select HAVE_DYNAMIC_FTRACE
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select HAVE_EFFICIENT_UNALIGNED_ACCESS
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select HAVE_FTRACE_MCOUNT_RECORD
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select HAVE_FUNCTION_TRACER
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_GCC_PLUGINS
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select HAVE_GENERIC_DMA_COHERENT
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select HAVE_HW_BREAKPOINT if PERF_EVENTS
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select HAVE_IRQ_TIME_ACCOUNTING
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select HAVE_MEMBLOCK
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select HAVE_MEMBLOCK_NODE_MAP if NUMA
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select HAVE_PATA_PLATFORM
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select HAVE_PERF_EVENTS
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select HAVE_PERF_REGS
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_REGS_AND_STACK_ACCESS_API
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select HAVE_RCU_TABLE_FREE
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select HAVE_SYSCALL_TRACEPOINTS
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select HAVE_KPROBES
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select HAVE_KRETPROBES if HAVE_KPROBES
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select IOMMU_DMA if IOMMU_SUPPORT
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select IRQ_DOMAIN
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select IRQ_FORCED_THREADING
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select MODULES_USE_ELF_RELA
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select NO_BOOTMEM
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select OF
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select OF_EARLY_FLATTREE
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select OF_RESERVED_MEM
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select PCI_ECAM if ACPI
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select POWER_RESET
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select POWER_SUPPLY
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select SPARSE_IRQ
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select SYSCTL_EXCEPTION_TRACE
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help
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ARM 64-bit (AArch64) Linux support.
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config 64BIT
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def_bool y
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config ARCH_PHYS_ADDR_T_64BIT
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def_bool y
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config MMU
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def_bool y
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config DEBUG_RODATA
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def_bool y
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config ARM64_PAGE_SHIFT
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int
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default 16 if ARM64_64K_PAGES
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default 14 if ARM64_16K_PAGES
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default 12
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config ARM64_CONT_SHIFT
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int
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default 5 if ARM64_64K_PAGES
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default 7 if ARM64_16K_PAGES
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default 4
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config ARCH_MMAP_RND_BITS_MIN
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default 14 if ARM64_64K_PAGES
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default 16 if ARM64_16K_PAGES
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default 18
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# max bits determined by the following formula:
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# VA_BITS - PAGE_SHIFT - 3
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config ARCH_MMAP_RND_BITS_MAX
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default 19 if ARM64_VA_BITS=36
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default 24 if ARM64_VA_BITS=39
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default 27 if ARM64_VA_BITS=42
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default 30 if ARM64_VA_BITS=47
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default 29 if ARM64_VA_BITS=48 && ARM64_64K_PAGES
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default 31 if ARM64_VA_BITS=48 && ARM64_16K_PAGES
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default 33 if ARM64_VA_BITS=48
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default 14 if ARM64_64K_PAGES
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default 16 if ARM64_16K_PAGES
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default 18
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config ARCH_MMAP_RND_COMPAT_BITS_MIN
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default 7 if ARM64_64K_PAGES
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default 9 if ARM64_16K_PAGES
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default 11
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config ARCH_MMAP_RND_COMPAT_BITS_MAX
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default 16
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config NO_IOPORT_MAP
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def_bool y if !PCI
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config STACKTRACE_SUPPORT
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def_bool y
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config ILLEGAL_POINTER_VALUE
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hex
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default 0xdead000000000000
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config LOCKDEP_SUPPORT
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config RWSEM_XCHGADD_ALGORITHM
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def_bool y
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config GENERIC_BUG
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def_bool y
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depends on BUG
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config GENERIC_BUG_RELATIVE_POINTERS
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def_bool y
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depends on GENERIC_BUG
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config GENERIC_HWEIGHT
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def_bool y
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config GENERIC_CSUM
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def_bool y
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config ZONE_DMA
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def_bool y
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config HAVE_GENERIC_RCU_GUP
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def_bool y
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config ARCH_DMA_ADDR_T_64BIT
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def_bool y
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config NEED_DMA_MAP_STATE
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def_bool y
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config NEED_SG_DMA_LENGTH
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def_bool y
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config SMP
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def_bool y
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config SWIOTLB
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def_bool y
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config IOMMU_HELPER
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def_bool SWIOTLB
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config KERNEL_MODE_NEON
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def_bool y
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config FIX_EARLYCON_MEM
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def_bool y
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config PGTABLE_LEVELS
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int
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default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
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default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
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default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
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default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
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default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
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default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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source "arch/arm64/Kconfig.platforms"
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menu "Bus support"
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config PCI
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bool "PCI support"
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help
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This feature enables support for PCI bus system. If you say Y
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here, the kernel will include drivers and infrastructure code
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to support PCI bus devices.
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config PCI_DOMAINS
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def_bool PCI
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config PCI_DOMAINS_GENERIC
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def_bool PCI
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config PCI_SYSCALL
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def_bool PCI
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source "drivers/pci/Kconfig"
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endmenu
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menu "Kernel Features"
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menu "ARM errata workarounds via the alternatives framework"
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config ARM64_ERRATUM_826319
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bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
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AXI master interface and an L2 cache.
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If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
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and is unable to accept a certain write via this interface, it will
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not progress on read data presented on the read data channel and the
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system can deadlock.
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The workaround promotes data cache clean instructions to
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data cache clean-and-invalidate.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_827319
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bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
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master interface and an L2 cache.
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Under certain conditions this erratum can cause a clean line eviction
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to occur at the same time as another transaction to the same address
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on the AMBA 5 CHI interface, which can cause data corruption if the
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interconnect reorders the two transactions.
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The workaround promotes data cache clean instructions to
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data cache clean-and-invalidate.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_824069
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bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
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to a coherent interconnect.
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If a Cortex-A53 processor is executing a store or prefetch for
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write instruction at the same time as a processor in another
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cluster is executing a cache maintenance operation to the same
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address, then this erratum might cause a clean cache line to be
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incorrectly marked as dirty.
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The workaround promotes data cache clean instructions to
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data cache clean-and-invalidate.
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Please note that this option does not necessarily enable the
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workaround, as it depends on the alternative framework, which will
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only patch the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_819472
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bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
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present when it is connected to a coherent interconnect.
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If the processor is executing a load and store exclusive sequence at
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the same time as a processor in another cluster is executing a cache
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maintenance operation to the same address, then this erratum might
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cause data corruption.
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The workaround promotes data cache clean instructions to
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data cache clean-and-invalidate.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_832075
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bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 832075 on Cortex-A57 parts up to r1p2.
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Affected Cortex-A57 parts might deadlock when exclusive load/store
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instructions to Write-Back memory are mixed with Device loads.
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The workaround is to promote device loads to use Load-Acquire
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semantics.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_834220
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bool "Cortex-A57: 834220: Stage 2 translation fault might be incorrectly reported in presence of a Stage 1 fault"
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depends on KVM
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 834220 on Cortex-A57 parts up to r1p2.
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Affected Cortex-A57 parts might report a Stage 2 translation
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fault as the result of a Stage 1 fault for load crossing a
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page boundary when there is a permission or device memory
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alignment fault at Stage 1 and a translation fault at Stage 2.
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The workaround is to verify that the Stage 1 translation
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doesn't generate a fault before handling the Stage 2 fault.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_845719
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bool "Cortex-A53: 845719: a load might read incorrect data"
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depends on COMPAT
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default y
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help
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This option adds an alternative code sequence to work around ARM
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erratum 845719 on Cortex-A53 parts up to r0p4.
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When running a compat (AArch32) userspace on an affected Cortex-A53
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part, a load at EL0 from a virtual address that matches the bottom 32
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bits of the virtual address used by a recent load at (AArch64) EL1
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might return incorrect data.
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The workaround is to write the contextidr_el1 register on exception
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return to a 32-bit task.
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Please note that this does not necessarily enable the workaround,
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as it depends on the alternative framework, which will only patch
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the kernel if an affected CPU is detected.
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If unsure, say Y.
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config ARM64_ERRATUM_843419
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bool "Cortex-A53: 843419: A load or store might access an incorrect address"
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default y
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select ARM64_MODULE_CMODEL_LARGE if MODULES
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help
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This option links the kernel with '--fix-cortex-a53-843419' and
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builds modules using the large memory model in order to avoid the use
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of the ADRP instruction, which can cause a subsequent memory access
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to use an incorrect address on Cortex-A53 parts up to r0p4.
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If unsure, say Y.
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config CAVIUM_ERRATUM_22375
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bool "Cavium erratum 22375, 24313"
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default y
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help
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Enable workaround for erratum 22375, 24313.
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This implements two gicv3-its errata workarounds for ThunderX. Both
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with small impact affecting only ITS table allocation.
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erratum 22375: only alloc 8MB table size
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erratum 24313: ignore memory access type
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The fixes are in ITS initialization and basically ignore memory access
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type and table size provided by the TYPER and BASER registers.
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If unsure, say Y.
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config CAVIUM_ERRATUM_23144
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bool "Cavium erratum 23144: ITS SYNC hang on dual socket system"
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depends on NUMA
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default y
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help
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ITS SYNC command hang for cross node io and collections/cpu mapping.
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If unsure, say Y.
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config CAVIUM_ERRATUM_23154
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bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed"
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default y
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help
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The gicv3 of ThunderX requires a modified version for
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reading the IAR status to ensure data synchronization
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(access to icc_iar1_el1 is not sync'ed before and after).
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If unsure, say Y.
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config CAVIUM_ERRATUM_27456
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bool "Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption"
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default y
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help
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On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
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instructions may cause the icache to become corrupted if it
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contains data for a non-current ASID. The fix is to
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invalidate the icache when changing the mm context.
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If unsure, say Y.
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endmenu
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choice
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prompt "Page size"
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default ARM64_4K_PAGES
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help
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Page size (translation granule) configuration.
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config ARM64_4K_PAGES
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bool "4KB"
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help
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This feature enables 4KB pages support.
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config ARM64_16K_PAGES
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bool "16KB"
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help
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The system will use 16KB pages support. AArch32 emulation
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requires applications compiled with 16K (or a multiple of 16K)
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aligned segments.
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config ARM64_64K_PAGES
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bool "64KB"
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help
|
|
This feature enables 64KB pages support (4KB by default)
|
|
allowing only two levels of page tables and faster TLB
|
|
look-up. AArch32 emulation requires applications compiled
|
|
with 64K aligned segments.
|
|
|
|
endchoice
|
|
|
|
choice
|
|
prompt "Virtual address space size"
|
|
default ARM64_VA_BITS_39 if ARM64_4K_PAGES
|
|
default ARM64_VA_BITS_47 if ARM64_16K_PAGES
|
|
default ARM64_VA_BITS_42 if ARM64_64K_PAGES
|
|
help
|
|
Allows choosing one of multiple possible virtual address
|
|
space sizes. The level of translation table is determined by
|
|
a combination of page size and virtual address space size.
|
|
|
|
config ARM64_VA_BITS_36
|
|
bool "36-bit" if EXPERT
|
|
depends on ARM64_16K_PAGES
|
|
|
|
config ARM64_VA_BITS_39
|
|
bool "39-bit"
|
|
depends on ARM64_4K_PAGES
|
|
|
|
config ARM64_VA_BITS_42
|
|
bool "42-bit"
|
|
depends on ARM64_64K_PAGES
|
|
|
|
config ARM64_VA_BITS_47
|
|
bool "47-bit"
|
|
depends on ARM64_16K_PAGES
|
|
|
|
config ARM64_VA_BITS_48
|
|
bool "48-bit"
|
|
|
|
endchoice
|
|
|
|
config ARM64_VA_BITS
|
|
int
|
|
default 36 if ARM64_VA_BITS_36
|
|
default 39 if ARM64_VA_BITS_39
|
|
default 42 if ARM64_VA_BITS_42
|
|
default 47 if ARM64_VA_BITS_47
|
|
default 48 if ARM64_VA_BITS_48
|
|
|
|
config CPU_BIG_ENDIAN
|
|
bool "Build big-endian kernel"
|
|
help
|
|
Say Y if you plan on running a kernel in big-endian mode.
|
|
|
|
config SCHED_MC
|
|
bool "Multi-core scheduler support"
|
|
help
|
|
Multi-core scheduler support improves the CPU scheduler's decision
|
|
making when dealing with multi-core CPU chips at a cost of slightly
|
|
increased overhead in some places. If unsure say N here.
|
|
|
|
config SCHED_SMT
|
|
bool "SMT scheduler support"
|
|
help
|
|
Improves the CPU scheduler's decision making when dealing with
|
|
MultiThreading at a cost of slightly increased overhead in some
|
|
places. If unsure say N here.
|
|
|
|
config NR_CPUS
|
|
int "Maximum number of CPUs (2-4096)"
|
|
range 2 4096
|
|
# These have to remain sorted largest to smallest
|
|
default "64"
|
|
|
|
config HOTPLUG_CPU
|
|
bool "Support for hot-pluggable CPUs"
|
|
select GENERIC_IRQ_MIGRATION
|
|
help
|
|
Say Y here to experiment with turning CPUs off and on. CPUs
|
|
can be controlled through /sys/devices/system/cpu.
|
|
|
|
# Common NUMA Features
|
|
config NUMA
|
|
bool "Numa Memory Allocation and Scheduler Support"
|
|
select ACPI_NUMA if ACPI
|
|
select OF_NUMA
|
|
help
|
|
Enable NUMA (Non Uniform Memory Access) support.
|
|
|
|
The kernel will try to allocate memory used by a CPU on the
|
|
local memory of the CPU and add some more
|
|
NUMA awareness to the kernel.
|
|
|
|
config NODES_SHIFT
|
|
int "Maximum NUMA Nodes (as a power of 2)"
|
|
range 1 10
|
|
default "2"
|
|
depends on NEED_MULTIPLE_NODES
|
|
help
|
|
Specify the maximum number of NUMA Nodes available on the target
|
|
system. Increases memory reserved to accommodate various tables.
|
|
|
|
config USE_PERCPU_NUMA_NODE_ID
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
config HAVE_SETUP_PER_CPU_AREA
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
config NEED_PER_CPU_EMBED_FIRST_CHUNK
|
|
def_bool y
|
|
depends on NUMA
|
|
|
|
source kernel/Kconfig.preempt
|
|
source kernel/Kconfig.hz
|
|
|
|
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
|
|
def_bool y
|
|
|
|
config ARCH_HAS_HOLES_MEMORYMODEL
|
|
def_bool y if SPARSEMEM
|
|
|
|
config ARCH_SPARSEMEM_ENABLE
|
|
def_bool y
|
|
select SPARSEMEM_VMEMMAP_ENABLE
|
|
|
|
config ARCH_SPARSEMEM_DEFAULT
|
|
def_bool ARCH_SPARSEMEM_ENABLE
|
|
|
|
config ARCH_SELECT_MEMORY_MODEL
|
|
def_bool ARCH_SPARSEMEM_ENABLE
|
|
|
|
config HAVE_ARCH_PFN_VALID
|
|
def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
|
|
|
|
config HW_PERF_EVENTS
|
|
def_bool y
|
|
depends on ARM_PMU
|
|
|
|
config SYS_SUPPORTS_HUGETLBFS
|
|
def_bool y
|
|
|
|
config ARCH_WANT_HUGE_PMD_SHARE
|
|
def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
|
|
|
|
config ARCH_HAS_CACHE_LINE_SIZE
|
|
def_bool y
|
|
|
|
source "mm/Kconfig"
|
|
|
|
config SECCOMP
|
|
bool "Enable seccomp to safely compute untrusted bytecode"
|
|
---help---
|
|
This kernel feature is useful for number crunching applications
|
|
that may need to compute untrusted bytecode during their
|
|
execution. By using pipes or other transports made available to
|
|
the process as file descriptors supporting the read/write
|
|
syscalls, it's possible to isolate those applications in
|
|
their own address space using seccomp. Once seccomp is
|
|
enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
|
|
and the task is only allowed to execute a few safe syscalls
|
|
defined by each seccomp mode.
|
|
|
|
config PARAVIRT
|
|
bool "Enable paravirtualization code"
|
|
help
|
|
This changes the kernel so it can modify itself when it is run
|
|
under a hypervisor, potentially improving performance significantly
|
|
over full virtualization.
|
|
|
|
config PARAVIRT_TIME_ACCOUNTING
|
|
bool "Paravirtual steal time accounting"
|
|
select PARAVIRT
|
|
default n
|
|
help
|
|
Select this option to enable fine granularity task steal time
|
|
accounting. Time spent executing other tasks in parallel with
|
|
the current vCPU is discounted from the vCPU power. To account for
|
|
that, there can be a small performance impact.
|
|
|
|
If in doubt, say N here.
|
|
|
|
config KEXEC
|
|
depends on PM_SLEEP_SMP
|
|
select KEXEC_CORE
|
|
bool "kexec system call"
|
|
---help---
|
|
kexec is a system call that implements the ability to shutdown your
|
|
current kernel, and to start another kernel. It is like a reboot
|
|
but it is independent of the system firmware. And like a reboot
|
|
you can start any kernel with it, not just Linux.
|
|
|
|
config XEN_DOM0
|
|
def_bool y
|
|
depends on XEN
|
|
|
|
config XEN
|
|
bool "Xen guest support on ARM64"
|
|
depends on ARM64 && OF
|
|
select SWIOTLB_XEN
|
|
select PARAVIRT
|
|
help
|
|
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
|
|
|
|
config FORCE_MAX_ZONEORDER
|
|
int
|
|
default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
|
|
default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE)
|
|
default "11"
|
|
help
|
|
The kernel memory allocator divides physically contiguous memory
|
|
blocks into "zones", where each zone is a power of two number of
|
|
pages. This option selects the largest power of two that the kernel
|
|
keeps in the memory allocator. If you need to allocate very large
|
|
blocks of physically contiguous memory, then you may need to
|
|
increase this value.
|
|
|
|
This config option is actually maximum order plus one. For example,
|
|
a value of 11 means that the largest free memory block is 2^10 pages.
|
|
|
|
We make sure that we can allocate upto a HugePage size for each configuration.
|
|
Hence we have :
|
|
MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2
|
|
|
|
However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
|
|
4M allocations matching the default size used by generic code.
|
|
|
|
menuconfig ARMV8_DEPRECATED
|
|
bool "Emulate deprecated/obsolete ARMv8 instructions"
|
|
depends on COMPAT
|
|
help
|
|
Legacy software support may require certain instructions
|
|
that have been deprecated or obsoleted in the architecture.
|
|
|
|
Enable this config to enable selective emulation of these
|
|
features.
|
|
|
|
If unsure, say Y
|
|
|
|
if ARMV8_DEPRECATED
|
|
|
|
config SWP_EMULATION
|
|
bool "Emulate SWP/SWPB instructions"
|
|
help
|
|
ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
|
|
they are always undefined. Say Y here to enable software
|
|
emulation of these instructions for userspace using LDXR/STXR.
|
|
|
|
In some older versions of glibc [<=2.8] SWP is used during futex
|
|
trylock() operations with the assumption that the code will not
|
|
be preempted. This invalid assumption may be more likely to fail
|
|
with SWP emulation enabled, leading to deadlock of the user
|
|
application.
|
|
|
|
NOTE: when accessing uncached shared regions, LDXR/STXR rely
|
|
on an external transaction monitoring block called a global
|
|
monitor to maintain update atomicity. If your system does not
|
|
implement a global monitor, this option can cause programs that
|
|
perform SWP operations to uncached memory to deadlock.
|
|
|
|
If unsure, say Y
|
|
|
|
config CP15_BARRIER_EMULATION
|
|
bool "Emulate CP15 Barrier instructions"
|
|
help
|
|
The CP15 barrier instructions - CP15ISB, CP15DSB, and
|
|
CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
|
|
strongly recommended to use the ISB, DSB, and DMB
|
|
instructions instead.
|
|
|
|
Say Y here to enable software emulation of these
|
|
instructions for AArch32 userspace code. When this option is
|
|
enabled, CP15 barrier usage is traced which can help
|
|
identify software that needs updating.
|
|
|
|
If unsure, say Y
|
|
|
|
config SETEND_EMULATION
|
|
bool "Emulate SETEND instruction"
|
|
help
|
|
The SETEND instruction alters the data-endianness of the
|
|
AArch32 EL0, and is deprecated in ARMv8.
|
|
|
|
Say Y here to enable software emulation of the instruction
|
|
for AArch32 userspace code.
|
|
|
|
Note: All the cpus on the system must have mixed endian support at EL0
|
|
for this feature to be enabled. If a new CPU - which doesn't support mixed
|
|
endian - is hotplugged in after this feature has been enabled, there could
|
|
be unexpected results in the applications.
|
|
|
|
If unsure, say Y
|
|
endif
|
|
|
|
menu "ARMv8.1 architectural features"
|
|
|
|
config ARM64_HW_AFDBM
|
|
bool "Support for hardware updates of the Access and Dirty page flags"
|
|
default y
|
|
help
|
|
The ARMv8.1 architecture extensions introduce support for
|
|
hardware updates of the access and dirty information in page
|
|
table entries. When enabled in TCR_EL1 (HA and HD bits) on
|
|
capable processors, accesses to pages with PTE_AF cleared will
|
|
set this bit instead of raising an access flag fault.
|
|
Similarly, writes to read-only pages with the DBM bit set will
|
|
clear the read-only bit (AP[2]) instead of raising a
|
|
permission fault.
|
|
|
|
Kernels built with this configuration option enabled continue
|
|
to work on pre-ARMv8.1 hardware and the performance impact is
|
|
minimal. If unsure, say Y.
|
|
|
|
config ARM64_PAN
|
|
bool "Enable support for Privileged Access Never (PAN)"
|
|
default y
|
|
help
|
|
Privileged Access Never (PAN; part of the ARMv8.1 Extensions)
|
|
prevents the kernel or hypervisor from accessing user-space (EL0)
|
|
memory directly.
|
|
|
|
Choosing this option will cause any unprotected (not using
|
|
copy_to_user et al) memory access to fail with a permission fault.
|
|
|
|
The feature is detected at runtime, and will remain as a 'nop'
|
|
instruction if the cpu does not implement the feature.
|
|
|
|
config ARM64_LSE_ATOMICS
|
|
bool "Atomic instructions"
|
|
help
|
|
As part of the Large System Extensions, ARMv8.1 introduces new
|
|
atomic instructions that are designed specifically to scale in
|
|
very large systems.
|
|
|
|
Say Y here to make use of these instructions for the in-kernel
|
|
atomic routines. This incurs a small overhead on CPUs that do
|
|
not support these instructions and requires the kernel to be
|
|
built with binutils >= 2.25.
|
|
|
|
config ARM64_VHE
|
|
bool "Enable support for Virtualization Host Extensions (VHE)"
|
|
default y
|
|
help
|
|
Virtualization Host Extensions (VHE) allow the kernel to run
|
|
directly at EL2 (instead of EL1) on processors that support
|
|
it. This leads to better performance for KVM, as they reduce
|
|
the cost of the world switch.
|
|
|
|
Selecting this option allows the VHE feature to be detected
|
|
at runtime, and does not affect processors that do not
|
|
implement this feature.
|
|
|
|
endmenu
|
|
|
|
menu "ARMv8.2 architectural features"
|
|
|
|
config ARM64_UAO
|
|
bool "Enable support for User Access Override (UAO)"
|
|
default y
|
|
help
|
|
User Access Override (UAO; part of the ARMv8.2 Extensions)
|
|
causes the 'unprivileged' variant of the load/store instructions to
|
|
be overriden to be privileged.
|
|
|
|
This option changes get_user() and friends to use the 'unprivileged'
|
|
variant of the load/store instructions. This ensures that user-space
|
|
really did have access to the supplied memory. When addr_limit is
|
|
set to kernel memory the UAO bit will be set, allowing privileged
|
|
access to kernel memory.
|
|
|
|
Choosing this option will cause copy_to_user() et al to use user-space
|
|
memory permissions.
|
|
|
|
The feature is detected at runtime, the kernel will use the
|
|
regular load/store instructions if the cpu does not implement the
|
|
feature.
|
|
|
|
endmenu
|
|
|
|
config ARM64_MODULE_CMODEL_LARGE
|
|
bool
|
|
|
|
config ARM64_MODULE_PLTS
|
|
bool
|
|
select ARM64_MODULE_CMODEL_LARGE
|
|
select HAVE_MOD_ARCH_SPECIFIC
|
|
|
|
config RELOCATABLE
|
|
bool
|
|
help
|
|
This builds the kernel as a Position Independent Executable (PIE),
|
|
which retains all relocation metadata required to relocate the
|
|
kernel binary at runtime to a different virtual address than the
|
|
address it was linked at.
|
|
Since AArch64 uses the RELA relocation format, this requires a
|
|
relocation pass at runtime even if the kernel is loaded at the
|
|
same address it was linked at.
|
|
|
|
config RANDOMIZE_BASE
|
|
bool "Randomize the address of the kernel image"
|
|
select ARM64_MODULE_PLTS if MODULES
|
|
select RELOCATABLE
|
|
help
|
|
Randomizes the virtual address at which the kernel image is
|
|
loaded, as a security feature that deters exploit attempts
|
|
relying on knowledge of the location of kernel internals.
|
|
|
|
It is the bootloader's job to provide entropy, by passing a
|
|
random u64 value in /chosen/kaslr-seed at kernel entry.
|
|
|
|
When booting via the UEFI stub, it will invoke the firmware's
|
|
EFI_RNG_PROTOCOL implementation (if available) to supply entropy
|
|
to the kernel proper. In addition, it will randomise the physical
|
|
location of the kernel Image as well.
|
|
|
|
If unsure, say N.
|
|
|
|
config RANDOMIZE_MODULE_REGION_FULL
|
|
bool "Randomize the module region independently from the core kernel"
|
|
depends on RANDOMIZE_BASE && !DYNAMIC_FTRACE
|
|
default y
|
|
help
|
|
Randomizes the location of the module region without considering the
|
|
location of the core kernel. This way, it is impossible for modules
|
|
to leak information about the location of core kernel data structures
|
|
but it does imply that function calls between modules and the core
|
|
kernel will need to be resolved via veneers in the module PLT.
|
|
|
|
When this option is not set, the module region will be randomized over
|
|
a limited range that contains the [_stext, _etext] interval of the
|
|
core kernel, so branch relocations are always in range.
|
|
|
|
endmenu
|
|
|
|
menu "Boot options"
|
|
|
|
config ARM64_ACPI_PARKING_PROTOCOL
|
|
bool "Enable support for the ARM64 ACPI parking protocol"
|
|
depends on ACPI
|
|
help
|
|
Enable support for the ARM64 ACPI parking protocol. If disabled
|
|
the kernel will not allow booting through the ARM64 ACPI parking
|
|
protocol even if the corresponding data is present in the ACPI
|
|
MADT table.
|
|
|
|
config CMDLINE
|
|
string "Default kernel command string"
|
|
default ""
|
|
help
|
|
Provide a set of default command-line options at build time by
|
|
entering them here. As a minimum, you should specify the the
|
|
root device (e.g. root=/dev/nfs).
|
|
|
|
config CMDLINE_FORCE
|
|
bool "Always use the default kernel command string"
|
|
help
|
|
Always use the default kernel command string, even if the boot
|
|
loader passes other arguments to the kernel.
|
|
This is useful if you cannot or don't want to change the
|
|
command-line options your boot loader passes to the kernel.
|
|
|
|
config EFI_STUB
|
|
bool
|
|
|
|
config EFI
|
|
bool "UEFI runtime support"
|
|
depends on OF && !CPU_BIG_ENDIAN
|
|
select LIBFDT
|
|
select UCS2_STRING
|
|
select EFI_PARAMS_FROM_FDT
|
|
select EFI_RUNTIME_WRAPPERS
|
|
select EFI_STUB
|
|
select EFI_ARMSTUB
|
|
default y
|
|
help
|
|
This option provides support for runtime services provided
|
|
by UEFI firmware (such as non-volatile variables, realtime
|
|
clock, and platform reset). A UEFI stub is also provided to
|
|
allow the kernel to be booted as an EFI application. This
|
|
is only useful on systems that have UEFI firmware.
|
|
|
|
config DMI
|
|
bool "Enable support for SMBIOS (DMI) tables"
|
|
depends on EFI
|
|
default y
|
|
help
|
|
This enables SMBIOS/DMI feature for systems.
|
|
|
|
This option is only useful on systems that have UEFI firmware.
|
|
However, even with this option, the resultant kernel should
|
|
continue to boot on existing non-UEFI platforms.
|
|
|
|
endmenu
|
|
|
|
menu "Userspace binary formats"
|
|
|
|
source "fs/Kconfig.binfmt"
|
|
|
|
config COMPAT
|
|
bool "Kernel support for 32-bit EL0"
|
|
depends on ARM64_4K_PAGES || EXPERT
|
|
select COMPAT_BINFMT_ELF
|
|
select HAVE_UID16
|
|
select OLD_SIGSUSPEND3
|
|
select COMPAT_OLD_SIGACTION
|
|
help
|
|
This option enables support for a 32-bit EL0 running under a 64-bit
|
|
kernel at EL1. AArch32-specific components such as system calls,
|
|
the user helper functions, VFP support and the ptrace interface are
|
|
handled appropriately by the kernel.
|
|
|
|
If you use a page size other than 4KB (i.e, 16KB or 64KB), please be aware
|
|
that you will only be able to execute AArch32 binaries that were compiled
|
|
with page size aligned segments.
|
|
|
|
If you want to execute 32-bit userspace applications, say Y.
|
|
|
|
config SYSVIPC_COMPAT
|
|
def_bool y
|
|
depends on COMPAT && SYSVIPC
|
|
|
|
endmenu
|
|
|
|
menu "Power management options"
|
|
|
|
source "kernel/power/Kconfig"
|
|
|
|
config ARCH_HIBERNATION_POSSIBLE
|
|
def_bool y
|
|
depends on CPU_PM
|
|
|
|
config ARCH_HIBERNATION_HEADER
|
|
def_bool y
|
|
depends on HIBERNATION
|
|
|
|
config ARCH_SUSPEND_POSSIBLE
|
|
def_bool y
|
|
|
|
endmenu
|
|
|
|
menu "CPU Power Management"
|
|
|
|
source "drivers/cpuidle/Kconfig"
|
|
|
|
source "drivers/cpufreq/Kconfig"
|
|
|
|
endmenu
|
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source "net/Kconfig"
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|
|
|
source "drivers/Kconfig"
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|
source "drivers/firmware/Kconfig"
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|
|
source "drivers/acpi/Kconfig"
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|
|
source "fs/Kconfig"
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|
|
|
source "arch/arm64/kvm/Kconfig"
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|
|
|
source "arch/arm64/Kconfig.debug"
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|
|
|
source "security/Kconfig"
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|
|
|
source "crypto/Kconfig"
|
|
if CRYPTO
|
|
source "arch/arm64/crypto/Kconfig"
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|
endif
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|
|
|
source "lib/Kconfig"
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