forked from Minki/linux
6e5f092784
The spectre mitigations are too configurable for their own good, leading to confusing logic trying to figure out when we should mitigate and when we shouldn't. Although the plethora of command-line options need to stick around for backwards compatibility, the default-on CONFIG options that depend on EXPERT can be dropped, as the mitigations only do anything if the system is vulnerable, a mitigation is available and the command-line hasn't disabled it. Remove CONFIG_HARDEN_BRANCH_PREDICTOR and CONFIG_ARM64_SSBD in favour of enabling this code unconditionally. Signed-off-by: Will Deacon <will@kernel.org>
1887 lines
62 KiB
Plaintext
1887 lines
62 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
config ARM64
|
|
def_bool y
|
|
select ACPI_CCA_REQUIRED if ACPI
|
|
select ACPI_GENERIC_GSI if ACPI
|
|
select ACPI_GTDT if ACPI
|
|
select ACPI_IORT if ACPI
|
|
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
|
|
select ACPI_MCFG if (ACPI && PCI)
|
|
select ACPI_SPCR_TABLE if ACPI
|
|
select ACPI_PPTT if ACPI
|
|
select ARCH_HAS_DEBUG_WX
|
|
select ARCH_BINFMT_ELF_STATE
|
|
select ARCH_HAS_DEBUG_VIRTUAL
|
|
select ARCH_HAS_DEBUG_VM_PGTABLE
|
|
select ARCH_HAS_DEVMEM_IS_ALLOWED
|
|
select ARCH_HAS_DMA_PREP_COHERENT
|
|
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
|
|
select ARCH_HAS_FAST_MULTIPLIER
|
|
select ARCH_HAS_FORTIFY_SOURCE
|
|
select ARCH_HAS_GCOV_PROFILE_ALL
|
|
select ARCH_HAS_GIGANTIC_PAGE
|
|
select ARCH_HAS_KCOV
|
|
select ARCH_HAS_KEEPINITRD
|
|
select ARCH_HAS_MEMBARRIER_SYNC_CORE
|
|
select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
|
|
select ARCH_HAS_PTE_DEVMAP
|
|
select ARCH_HAS_PTE_SPECIAL
|
|
select ARCH_HAS_SETUP_DMA_OPS
|
|
select ARCH_HAS_SET_DIRECT_MAP
|
|
select ARCH_HAS_SET_MEMORY
|
|
select ARCH_HAS_STRICT_KERNEL_RWX
|
|
select ARCH_HAS_STRICT_MODULE_RWX
|
|
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
|
|
select ARCH_HAS_SYNC_DMA_FOR_CPU
|
|
select ARCH_HAS_SYSCALL_WRAPPER
|
|
select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
|
|
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
|
|
select ARCH_HAVE_ELF_PROT
|
|
select ARCH_HAVE_NMI_SAFE_CMPXCHG
|
|
select ARCH_INLINE_READ_LOCK if !PREEMPTION
|
|
select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
|
|
select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
|
|
select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
|
|
select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
|
|
select ARCH_KEEP_MEMBLOCK
|
|
select ARCH_USE_CMPXCHG_LOCKREF
|
|
select ARCH_USE_GNU_PROPERTY
|
|
select ARCH_USE_QUEUED_RWLOCKS
|
|
select ARCH_USE_QUEUED_SPINLOCKS
|
|
select ARCH_USE_SYM_ANNOTATIONS
|
|
select ARCH_SUPPORTS_MEMORY_FAILURE
|
|
select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK
|
|
select ARCH_SUPPORTS_ATOMIC_RMW
|
|
select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && (GCC_VERSION >= 50000 || CC_IS_CLANG)
|
|
select ARCH_SUPPORTS_NUMA_BALANCING
|
|
select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT
|
|
select ARCH_WANT_DEFAULT_BPF_JIT
|
|
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
|
|
select ARCH_WANT_FRAME_POINTERS
|
|
select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
|
|
select ARCH_HAS_UBSAN_SANITIZE_ALL
|
|
select ARM_AMBA
|
|
select ARM_ARCH_TIMER
|
|
select ARM_GIC
|
|
select AUDIT_ARCH_COMPAT_GENERIC
|
|
select ARM_GIC_V2M if PCI
|
|
select ARM_GIC_V3
|
|
select ARM_GIC_V3_ITS if PCI
|
|
select ARM_PSCI_FW
|
|
select BUILDTIME_TABLE_SORT
|
|
select CLONE_BACKWARDS
|
|
select COMMON_CLK
|
|
select CPU_PM if (SUSPEND || CPU_IDLE)
|
|
select CRC32
|
|
select DCACHE_WORD_ACCESS
|
|
select DMA_DIRECT_REMAP
|
|
select EDAC_SUPPORT
|
|
select FRAME_POINTER
|
|
select GENERIC_ALLOCATOR
|
|
select GENERIC_ARCH_TOPOLOGY
|
|
select GENERIC_CLOCKEVENTS
|
|
select GENERIC_CLOCKEVENTS_BROADCAST
|
|
select GENERIC_CPU_AUTOPROBE
|
|
select GENERIC_CPU_VULNERABILITIES
|
|
select GENERIC_EARLY_IOREMAP
|
|
select GENERIC_IDLE_POLL_SETUP
|
|
select GENERIC_IRQ_MULTI_HANDLER
|
|
select GENERIC_IRQ_PROBE
|
|
select GENERIC_IRQ_SHOW
|
|
select GENERIC_IRQ_SHOW_LEVEL
|
|
select GENERIC_PCI_IOMAP
|
|
select GENERIC_PTDUMP
|
|
select GENERIC_SCHED_CLOCK
|
|
select GENERIC_SMP_IDLE_THREAD
|
|
select GENERIC_STRNCPY_FROM_USER
|
|
select GENERIC_STRNLEN_USER
|
|
select GENERIC_TIME_VSYSCALL
|
|
select GENERIC_GETTIMEOFDAY
|
|
select GENERIC_VDSO_TIME_NS
|
|
select HANDLE_DOMAIN_IRQ
|
|
select HARDIRQS_SW_RESEND
|
|
select HAVE_PCI
|
|
select HAVE_ACPI_APEI if (ACPI && EFI)
|
|
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
|
|
select HAVE_ARCH_AUDITSYSCALL
|
|
select HAVE_ARCH_BITREVERSE
|
|
select HAVE_ARCH_COMPILER_H
|
|
select HAVE_ARCH_HUGE_VMAP
|
|
select HAVE_ARCH_JUMP_LABEL
|
|
select HAVE_ARCH_JUMP_LABEL_RELATIVE
|
|
select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48)
|
|
select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
|
|
select HAVE_ARCH_KGDB
|
|
select HAVE_ARCH_MMAP_RND_BITS
|
|
select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
|
|
select HAVE_ARCH_PREL32_RELOCATIONS
|
|
select HAVE_ARCH_SECCOMP_FILTER
|
|
select HAVE_ARCH_STACKLEAK
|
|
select HAVE_ARCH_THREAD_STRUCT_WHITELIST
|
|
select HAVE_ARCH_TRACEHOOK
|
|
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
|
|
select HAVE_ARCH_VMAP_STACK
|
|
select HAVE_ARM_SMCCC
|
|
select HAVE_ASM_MODVERSIONS
|
|
select HAVE_EBPF_JIT
|
|
select HAVE_C_RECORDMCOUNT
|
|
select HAVE_CMPXCHG_DOUBLE
|
|
select HAVE_CMPXCHG_LOCAL
|
|
select HAVE_CONTEXT_TRACKING
|
|
select HAVE_DEBUG_BUGVERBOSE
|
|
select HAVE_DEBUG_KMEMLEAK
|
|
select HAVE_DMA_CONTIGUOUS
|
|
select HAVE_DYNAMIC_FTRACE
|
|
select HAVE_DYNAMIC_FTRACE_WITH_REGS \
|
|
if $(cc-option,-fpatchable-function-entry=2)
|
|
select HAVE_EFFICIENT_UNALIGNED_ACCESS
|
|
select HAVE_FAST_GUP
|
|
select HAVE_FTRACE_MCOUNT_RECORD
|
|
select HAVE_FUNCTION_TRACER
|
|
select HAVE_FUNCTION_ERROR_INJECTION
|
|
select HAVE_FUNCTION_GRAPH_TRACER
|
|
select HAVE_GCC_PLUGINS
|
|
select HAVE_HW_BREAKPOINT if PERF_EVENTS
|
|
select HAVE_IRQ_TIME_ACCOUNTING
|
|
select HAVE_NMI
|
|
select HAVE_PATA_PLATFORM
|
|
select HAVE_PERF_EVENTS
|
|
select HAVE_PERF_REGS
|
|
select HAVE_PERF_USER_STACK_DUMP
|
|
select HAVE_REGS_AND_STACK_ACCESS_API
|
|
select HAVE_FUNCTION_ARG_ACCESS_API
|
|
select HAVE_FUTEX_CMPXCHG if FUTEX
|
|
select MMU_GATHER_RCU_TABLE_FREE
|
|
select HAVE_RSEQ
|
|
select HAVE_STACKPROTECTOR
|
|
select HAVE_SYSCALL_TRACEPOINTS
|
|
select HAVE_KPROBES
|
|
select HAVE_KRETPROBES
|
|
select HAVE_GENERIC_VDSO
|
|
select IOMMU_DMA if IOMMU_SUPPORT
|
|
select IRQ_DOMAIN
|
|
select IRQ_FORCED_THREADING
|
|
select MODULES_USE_ELF_RELA
|
|
select NEED_DMA_MAP_STATE
|
|
select NEED_SG_DMA_LENGTH
|
|
select OF
|
|
select OF_EARLY_FLATTREE
|
|
select PCI_DOMAINS_GENERIC if PCI
|
|
select PCI_ECAM if (ACPI && PCI)
|
|
select PCI_SYSCALL if PCI
|
|
select POWER_RESET
|
|
select POWER_SUPPLY
|
|
select SPARSE_IRQ
|
|
select SWIOTLB
|
|
select SYSCTL_EXCEPTION_TRACE
|
|
select THREAD_INFO_IN_TASK
|
|
help
|
|
ARM 64-bit (AArch64) Linux support.
|
|
|
|
config 64BIT
|
|
def_bool y
|
|
|
|
config MMU
|
|
def_bool y
|
|
|
|
config ARM64_PAGE_SHIFT
|
|
int
|
|
default 16 if ARM64_64K_PAGES
|
|
default 14 if ARM64_16K_PAGES
|
|
default 12
|
|
|
|
config ARM64_CONT_SHIFT
|
|
int
|
|
default 5 if ARM64_64K_PAGES
|
|
default 7 if ARM64_16K_PAGES
|
|
default 4
|
|
|
|
config ARCH_MMAP_RND_BITS_MIN
|
|
default 14 if ARM64_64K_PAGES
|
|
default 16 if ARM64_16K_PAGES
|
|
default 18
|
|
|
|
# max bits determined by the following formula:
|
|
# VA_BITS - PAGE_SHIFT - 3
|
|
config ARCH_MMAP_RND_BITS_MAX
|
|
default 19 if ARM64_VA_BITS=36
|
|
default 24 if ARM64_VA_BITS=39
|
|
default 27 if ARM64_VA_BITS=42
|
|
default 30 if ARM64_VA_BITS=47
|
|
default 29 if ARM64_VA_BITS=48 && ARM64_64K_PAGES
|
|
default 31 if ARM64_VA_BITS=48 && ARM64_16K_PAGES
|
|
default 33 if ARM64_VA_BITS=48
|
|
default 14 if ARM64_64K_PAGES
|
|
default 16 if ARM64_16K_PAGES
|
|
default 18
|
|
|
|
config ARCH_MMAP_RND_COMPAT_BITS_MIN
|
|
default 7 if ARM64_64K_PAGES
|
|
default 9 if ARM64_16K_PAGES
|
|
default 11
|
|
|
|
config ARCH_MMAP_RND_COMPAT_BITS_MAX
|
|
default 16
|
|
|
|
config NO_IOPORT_MAP
|
|
def_bool y if !PCI
|
|
|
|
config STACKTRACE_SUPPORT
|
|
def_bool y
|
|
|
|
config ILLEGAL_POINTER_VALUE
|
|
hex
|
|
default 0xdead000000000000
|
|
|
|
config LOCKDEP_SUPPORT
|
|
def_bool y
|
|
|
|
config TRACE_IRQFLAGS_SUPPORT
|
|
def_bool y
|
|
|
|
config GENERIC_BUG
|
|
def_bool y
|
|
depends on BUG
|
|
|
|
config GENERIC_BUG_RELATIVE_POINTERS
|
|
def_bool y
|
|
depends on GENERIC_BUG
|
|
|
|
config GENERIC_HWEIGHT
|
|
def_bool y
|
|
|
|
config GENERIC_CSUM
|
|
def_bool y
|
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
def_bool y
|
|
|
|
config ZONE_DMA
|
|
bool "Support DMA zone" if EXPERT
|
|
default y
|
|
|
|
config ZONE_DMA32
|
|
bool "Support DMA32 zone" if EXPERT
|
|
default y
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTPLUG
|
|
def_bool y
|
|
|
|
config ARCH_ENABLE_MEMORY_HOTREMOVE
|
|
def_bool y
|
|
|
|
config SMP
|
|
def_bool y
|
|
|
|
config KERNEL_MODE_NEON
|
|
def_bool y
|
|
|
|
config FIX_EARLYCON_MEM
|
|
def_bool y
|
|
|
|
config PGTABLE_LEVELS
|
|
int
|
|
default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
|
|
default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
|
|
default 3 if ARM64_64K_PAGES && (ARM64_VA_BITS_48 || ARM64_VA_BITS_52)
|
|
default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
|
|
default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
|
|
default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
|
|
|
|
config ARCH_SUPPORTS_UPROBES
|
|
def_bool y
|
|
|
|
config ARCH_PROC_KCORE_TEXT
|
|
def_bool y
|
|
|
|
config BROKEN_GAS_INST
|
|
def_bool !$(as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n)
|
|
|
|
config KASAN_SHADOW_OFFSET
|
|
hex
|
|
depends on KASAN
|
|
default 0xdfffa00000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && !KASAN_SW_TAGS
|
|
default 0xdfffd00000000000 if ARM64_VA_BITS_47 && !KASAN_SW_TAGS
|
|
default 0xdffffe8000000000 if ARM64_VA_BITS_42 && !KASAN_SW_TAGS
|
|
default 0xdfffffd000000000 if ARM64_VA_BITS_39 && !KASAN_SW_TAGS
|
|
default 0xdffffffa00000000 if ARM64_VA_BITS_36 && !KASAN_SW_TAGS
|
|
default 0xefff900000000000 if (ARM64_VA_BITS_48 || ARM64_VA_BITS_52) && KASAN_SW_TAGS
|
|
default 0xefffc80000000000 if ARM64_VA_BITS_47 && KASAN_SW_TAGS
|
|
default 0xeffffe4000000000 if ARM64_VA_BITS_42 && KASAN_SW_TAGS
|
|
default 0xefffffc800000000 if ARM64_VA_BITS_39 && KASAN_SW_TAGS
|
|
default 0xeffffff900000000 if ARM64_VA_BITS_36 && KASAN_SW_TAGS
|
|
default 0xffffffffffffffff
|
|
|
|
source "arch/arm64/Kconfig.platforms"
|
|
|
|
menu "Kernel Features"
|
|
|
|
menu "ARM errata workarounds via the alternatives framework"
|
|
|
|
config ARM64_WORKAROUND_CLEAN_CACHE
|
|
bool
|
|
|
|
config ARM64_ERRATUM_826319
|
|
bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
|
|
default y
|
|
select ARM64_WORKAROUND_CLEAN_CACHE
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
|
|
AXI master interface and an L2 cache.
|
|
|
|
If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
|
|
and is unable to accept a certain write via this interface, it will
|
|
not progress on read data presented on the read data channel and the
|
|
system can deadlock.
|
|
|
|
The workaround promotes data cache clean instructions to
|
|
data cache clean-and-invalidate.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_827319
|
|
bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
|
|
default y
|
|
select ARM64_WORKAROUND_CLEAN_CACHE
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
|
|
master interface and an L2 cache.
|
|
|
|
Under certain conditions this erratum can cause a clean line eviction
|
|
to occur at the same time as another transaction to the same address
|
|
on the AMBA 5 CHI interface, which can cause data corruption if the
|
|
interconnect reorders the two transactions.
|
|
|
|
The workaround promotes data cache clean instructions to
|
|
data cache clean-and-invalidate.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_824069
|
|
bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
|
|
default y
|
|
select ARM64_WORKAROUND_CLEAN_CACHE
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
|
|
to a coherent interconnect.
|
|
|
|
If a Cortex-A53 processor is executing a store or prefetch for
|
|
write instruction at the same time as a processor in another
|
|
cluster is executing a cache maintenance operation to the same
|
|
address, then this erratum might cause a clean cache line to be
|
|
incorrectly marked as dirty.
|
|
|
|
The workaround promotes data cache clean instructions to
|
|
data cache clean-and-invalidate.
|
|
Please note that this option does not necessarily enable the
|
|
workaround, as it depends on the alternative framework, which will
|
|
only patch the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_819472
|
|
bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
|
|
default y
|
|
select ARM64_WORKAROUND_CLEAN_CACHE
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
|
|
present when it is connected to a coherent interconnect.
|
|
|
|
If the processor is executing a load and store exclusive sequence at
|
|
the same time as a processor in another cluster is executing a cache
|
|
maintenance operation to the same address, then this erratum might
|
|
cause data corruption.
|
|
|
|
The workaround promotes data cache clean instructions to
|
|
data cache clean-and-invalidate.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_832075
|
|
bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
|
|
default y
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 832075 on Cortex-A57 parts up to r1p2.
|
|
|
|
Affected Cortex-A57 parts might deadlock when exclusive load/store
|
|
instructions to Write-Back memory are mixed with Device loads.
|
|
|
|
The workaround is to promote device loads to use Load-Acquire
|
|
semantics.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_834220
|
|
bool "Cortex-A57: 834220: Stage 2 translation fault might be incorrectly reported in presence of a Stage 1 fault"
|
|
depends on KVM
|
|
default y
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 834220 on Cortex-A57 parts up to r1p2.
|
|
|
|
Affected Cortex-A57 parts might report a Stage 2 translation
|
|
fault as the result of a Stage 1 fault for load crossing a
|
|
page boundary when there is a permission or device memory
|
|
alignment fault at Stage 1 and a translation fault at Stage 2.
|
|
|
|
The workaround is to verify that the Stage 1 translation
|
|
doesn't generate a fault before handling the Stage 2 fault.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_845719
|
|
bool "Cortex-A53: 845719: a load might read incorrect data"
|
|
depends on COMPAT
|
|
default y
|
|
help
|
|
This option adds an alternative code sequence to work around ARM
|
|
erratum 845719 on Cortex-A53 parts up to r0p4.
|
|
|
|
When running a compat (AArch32) userspace on an affected Cortex-A53
|
|
part, a load at EL0 from a virtual address that matches the bottom 32
|
|
bits of the virtual address used by a recent load at (AArch64) EL1
|
|
might return incorrect data.
|
|
|
|
The workaround is to write the contextidr_el1 register on exception
|
|
return to a 32-bit task.
|
|
Please note that this does not necessarily enable the workaround,
|
|
as it depends on the alternative framework, which will only patch
|
|
the kernel if an affected CPU is detected.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_843419
|
|
bool "Cortex-A53: 843419: A load or store might access an incorrect address"
|
|
default y
|
|
select ARM64_MODULE_PLTS if MODULES
|
|
help
|
|
This option links the kernel with '--fix-cortex-a53-843419' and
|
|
enables PLT support to replace certain ADRP instructions, which can
|
|
cause subsequent memory accesses to use an incorrect address on
|
|
Cortex-A53 parts up to r0p4.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_1024718
|
|
bool "Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update"
|
|
default y
|
|
help
|
|
This option adds a workaround for ARM Cortex-A55 Erratum 1024718.
|
|
|
|
Affected Cortex-A55 cores (r0p0, r0p1, r1p0) could cause incorrect
|
|
update of the hardware dirty bit when the DBM/AP bits are updated
|
|
without a break-before-make. The workaround is to disable the usage
|
|
of hardware DBM locally on the affected cores. CPUs not affected by
|
|
this erratum will continue to use the feature.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_1418040
|
|
bool "Cortex-A76/Neoverse-N1: MRC read following MRRC read of specific Generic Timer in AArch32 might give incorrect result"
|
|
default y
|
|
depends on COMPAT
|
|
help
|
|
This option adds a workaround for ARM Cortex-A76/Neoverse-N1
|
|
errata 1188873 and 1418040.
|
|
|
|
Affected Cortex-A76/Neoverse-N1 cores (r0p0 to r3p1) could
|
|
cause register corruption when accessing the timer registers
|
|
from AArch32 userspace.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_WORKAROUND_SPECULATIVE_AT
|
|
bool
|
|
|
|
config ARM64_ERRATUM_1165522
|
|
bool "Cortex-A76: 1165522: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
|
|
default y
|
|
select ARM64_WORKAROUND_SPECULATIVE_AT
|
|
help
|
|
This option adds a workaround for ARM Cortex-A76 erratum 1165522.
|
|
|
|
Affected Cortex-A76 cores (r0p0, r1p0, r2p0) could end-up with
|
|
corrupted TLBs by speculating an AT instruction during a guest
|
|
context switch.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_1319367
|
|
bool "Cortex-A57/A72: 1319537: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
|
|
default y
|
|
select ARM64_WORKAROUND_SPECULATIVE_AT
|
|
help
|
|
This option adds work arounds for ARM Cortex-A57 erratum 1319537
|
|
and A72 erratum 1319367
|
|
|
|
Cortex-A57 and A72 cores could end-up with corrupted TLBs by
|
|
speculating an AT instruction during a guest context switch.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_1530923
|
|
bool "Cortex-A55: 1530923: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
|
|
default y
|
|
select ARM64_WORKAROUND_SPECULATIVE_AT
|
|
help
|
|
This option adds a workaround for ARM Cortex-A55 erratum 1530923.
|
|
|
|
Affected Cortex-A55 cores (r0p0, r0p1, r1p0, r2p0) could end-up with
|
|
corrupted TLBs by speculating an AT instruction during a guest
|
|
context switch.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_WORKAROUND_REPEAT_TLBI
|
|
bool
|
|
|
|
config ARM64_ERRATUM_1286807
|
|
bool "Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation"
|
|
default y
|
|
select ARM64_WORKAROUND_REPEAT_TLBI
|
|
help
|
|
This option adds a workaround for ARM Cortex-A76 erratum 1286807.
|
|
|
|
On the affected Cortex-A76 cores (r0p0 to r3p0), if a virtual
|
|
address for a cacheable mapping of a location is being
|
|
accessed by a core while another core is remapping the virtual
|
|
address to a new physical page using the recommended
|
|
break-before-make sequence, then under very rare circumstances
|
|
TLBI+DSB completes before a read using the translation being
|
|
invalidated has been observed by other observers. The
|
|
workaround repeats the TLBI+DSB operation.
|
|
|
|
config ARM64_ERRATUM_1463225
|
|
bool "Cortex-A76: Software Step might prevent interrupt recognition"
|
|
default y
|
|
help
|
|
This option adds a workaround for Arm Cortex-A76 erratum 1463225.
|
|
|
|
On the affected Cortex-A76 cores (r0p0 to r3p1), software stepping
|
|
of a system call instruction (SVC) can prevent recognition of
|
|
subsequent interrupts when software stepping is disabled in the
|
|
exception handler of the system call and either kernel debugging
|
|
is enabled or VHE is in use.
|
|
|
|
Work around the erratum by triggering a dummy step exception
|
|
when handling a system call from a task that is being stepped
|
|
in a VHE configuration of the kernel.
|
|
|
|
If unsure, say Y.
|
|
|
|
config ARM64_ERRATUM_1542419
|
|
bool "Neoverse-N1: workaround mis-ordering of instruction fetches"
|
|
default y
|
|
help
|
|
This option adds a workaround for ARM Neoverse-N1 erratum
|
|
1542419.
|
|
|
|
Affected Neoverse-N1 cores could execute a stale instruction when
|
|
modified by another CPU. The workaround depends on a firmware
|
|
counterpart.
|
|
|
|
Workaround the issue by hiding the DIC feature from EL0. This
|
|
forces user-space to perform cache maintenance.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_ERRATUM_22375
|
|
bool "Cavium erratum 22375, 24313"
|
|
default y
|
|
help
|
|
Enable workaround for errata 22375 and 24313.
|
|
|
|
This implements two gicv3-its errata workarounds for ThunderX. Both
|
|
with a small impact affecting only ITS table allocation.
|
|
|
|
erratum 22375: only alloc 8MB table size
|
|
erratum 24313: ignore memory access type
|
|
|
|
The fixes are in ITS initialization and basically ignore memory access
|
|
type and table size provided by the TYPER and BASER registers.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_ERRATUM_23144
|
|
bool "Cavium erratum 23144: ITS SYNC hang on dual socket system"
|
|
depends on NUMA
|
|
default y
|
|
help
|
|
ITS SYNC command hang for cross node io and collections/cpu mapping.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_ERRATUM_23154
|
|
bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed"
|
|
default y
|
|
help
|
|
The gicv3 of ThunderX requires a modified version for
|
|
reading the IAR status to ensure data synchronization
|
|
(access to icc_iar1_el1 is not sync'ed before and after).
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_ERRATUM_27456
|
|
bool "Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption"
|
|
default y
|
|
help
|
|
On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
|
|
instructions may cause the icache to become corrupted if it
|
|
contains data for a non-current ASID. The fix is to
|
|
invalidate the icache when changing the mm context.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_ERRATUM_30115
|
|
bool "Cavium erratum 30115: Guest may disable interrupts in host"
|
|
default y
|
|
help
|
|
On ThunderX T88 pass 1.x through 2.2, T81 pass 1.0 through
|
|
1.2, and T83 Pass 1.0, KVM guest execution may disable
|
|
interrupts in host. Trapping both GICv3 group-0 and group-1
|
|
accesses sidesteps the issue.
|
|
|
|
If unsure, say Y.
|
|
|
|
config CAVIUM_TX2_ERRATUM_219
|
|
bool "Cavium ThunderX2 erratum 219: PRFM between TTBR change and ISB fails"
|
|
default y
|
|
help
|
|
On Cavium ThunderX2, a load, store or prefetch instruction between a
|
|
TTBR update and the corresponding context synchronizing operation can
|
|
cause a spurious Data Abort to be delivered to any hardware thread in
|
|
the CPU core.
|
|
|
|
Work around the issue by avoiding the problematic code sequence and
|
|
trapping KVM guest TTBRx_EL1 writes to EL2 when SMT is enabled. The
|
|
trap handler performs the corresponding register access, skips the
|
|
instruction and ensures context synchronization by virtue of the
|
|
exception return.
|
|
|
|
If unsure, say Y.
|
|
|
|
config FUJITSU_ERRATUM_010001
|
|
bool "Fujitsu-A64FX erratum E#010001: Undefined fault may occur wrongly"
|
|
default y
|
|
help
|
|
This option adds a workaround for Fujitsu-A64FX erratum E#010001.
|
|
On some variants of the Fujitsu-A64FX cores ver(1.0, 1.1), memory
|
|
accesses may cause undefined fault (Data abort, DFSC=0b111111).
|
|
This fault occurs under a specific hardware condition when a
|
|
load/store instruction performs an address translation using:
|
|
case-1 TTBR0_EL1 with TCR_EL1.NFD0 == 1.
|
|
case-2 TTBR0_EL2 with TCR_EL2.NFD0 == 1.
|
|
case-3 TTBR1_EL1 with TCR_EL1.NFD1 == 1.
|
|
case-4 TTBR1_EL2 with TCR_EL2.NFD1 == 1.
|
|
|
|
The workaround is to ensure these bits are clear in TCR_ELx.
|
|
The workaround only affects the Fujitsu-A64FX.
|
|
|
|
If unsure, say Y.
|
|
|
|
config HISILICON_ERRATUM_161600802
|
|
bool "Hip07 161600802: Erroneous redistributor VLPI base"
|
|
default y
|
|
help
|
|
The HiSilicon Hip07 SoC uses the wrong redistributor base
|
|
when issued ITS commands such as VMOVP and VMAPP, and requires
|
|
a 128kB offset to be applied to the target address in this commands.
|
|
|
|
If unsure, say Y.
|
|
|
|
config QCOM_FALKOR_ERRATUM_1003
|
|
bool "Falkor E1003: Incorrect translation due to ASID change"
|
|
default y
|
|
help
|
|
On Falkor v1, an incorrect ASID may be cached in the TLB when ASID
|
|
and BADDR are changed together in TTBRx_EL1. Since we keep the ASID
|
|
in TTBR1_EL1, this situation only occurs in the entry trampoline and
|
|
then only for entries in the walk cache, since the leaf translation
|
|
is unchanged. Work around the erratum by invalidating the walk cache
|
|
entries for the trampoline before entering the kernel proper.
|
|
|
|
config QCOM_FALKOR_ERRATUM_1009
|
|
bool "Falkor E1009: Prematurely complete a DSB after a TLBI"
|
|
default y
|
|
select ARM64_WORKAROUND_REPEAT_TLBI
|
|
help
|
|
On Falkor v1, the CPU may prematurely complete a DSB following a
|
|
TLBI xxIS invalidate maintenance operation. Repeat the TLBI operation
|
|
one more time to fix the issue.
|
|
|
|
If unsure, say Y.
|
|
|
|
config QCOM_QDF2400_ERRATUM_0065
|
|
bool "QDF2400 E0065: Incorrect GITS_TYPER.ITT_Entry_size"
|
|
default y
|
|
help
|
|
On Qualcomm Datacenter Technologies QDF2400 SoC, ITS hardware reports
|
|
ITE size incorrectly. The GITS_TYPER.ITT_Entry_size field should have
|
|
been indicated as 16Bytes (0xf), not 8Bytes (0x7).
|
|
|
|
If unsure, say Y.
|
|
|
|
config QCOM_FALKOR_ERRATUM_E1041
|
|
bool "Falkor E1041: Speculative instruction fetches might cause errant memory access"
|
|
default y
|
|
help
|
|
Falkor CPU may speculatively fetch instructions from an improper
|
|
memory location when MMU translation is changed from SCTLR_ELn[M]=1
|
|
to SCTLR_ELn[M]=0. Prefix an ISB instruction to fix the problem.
|
|
|
|
If unsure, say Y.
|
|
|
|
config SOCIONEXT_SYNQUACER_PREITS
|
|
bool "Socionext Synquacer: Workaround for GICv3 pre-ITS"
|
|
default y
|
|
help
|
|
Socionext Synquacer SoCs implement a separate h/w block to generate
|
|
MSI doorbell writes with non-zero values for the device ID.
|
|
|
|
If unsure, say Y.
|
|
|
|
endmenu
|
|
|
|
|
|
choice
|
|
prompt "Page size"
|
|
default ARM64_4K_PAGES
|
|
help
|
|
Page size (translation granule) configuration.
|
|
|
|
config ARM64_4K_PAGES
|
|
bool "4KB"
|
|
help
|
|
This feature enables 4KB pages support.
|
|
|
|
config ARM64_16K_PAGES
|
|
bool "16KB"
|
|
help
|
|
The system will use 16KB pages support. AArch32 emulation
|
|
requires applications compiled with 16K (or a multiple of 16K)
|
|
aligned segments.
|
|
|
|
config ARM64_64K_PAGES
|
|
bool "64KB"
|
|
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"
|
|
|
|
config ARM64_VA_BITS_52
|
|
bool "52-bit"
|
|
depends on ARM64_64K_PAGES && (ARM64_PAN || !ARM64_SW_TTBR0_PAN)
|
|
help
|
|
Enable 52-bit virtual addressing for userspace when explicitly
|
|
requested via a hint to mmap(). The kernel will also use 52-bit
|
|
virtual addresses for its own mappings (provided HW support for
|
|
this feature is available, otherwise it reverts to 48-bit).
|
|
|
|
NOTE: Enabling 52-bit virtual addressing in conjunction with
|
|
ARMv8.3 Pointer Authentication will result in the PAC being
|
|
reduced from 7 bits to 3 bits, which may have a significant
|
|
impact on its susceptibility to brute-force attacks.
|
|
|
|
If unsure, select 48-bit virtual addressing instead.
|
|
|
|
endchoice
|
|
|
|
config ARM64_FORCE_52BIT
|
|
bool "Force 52-bit virtual addresses for userspace"
|
|
depends on ARM64_VA_BITS_52 && EXPERT
|
|
help
|
|
For systems with 52-bit userspace VAs enabled, the kernel will attempt
|
|
to maintain compatibility with older software by providing 48-bit VAs
|
|
unless a hint is supplied to mmap.
|
|
|
|
This configuration option disables the 48-bit compatibility logic, and
|
|
forces all userspace addresses to be 52-bit on HW that supports it. One
|
|
should only enable this configuration option for stress testing userspace
|
|
memory management code. If unsure say N here.
|
|
|
|
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
|
|
default 52 if ARM64_VA_BITS_52
|
|
|
|
choice
|
|
prompt "Physical address space size"
|
|
default ARM64_PA_BITS_48
|
|
help
|
|
Choose the maximum physical address range that the kernel will
|
|
support.
|
|
|
|
config ARM64_PA_BITS_48
|
|
bool "48-bit"
|
|
|
|
config ARM64_PA_BITS_52
|
|
bool "52-bit (ARMv8.2)"
|
|
depends on ARM64_64K_PAGES
|
|
depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN
|
|
help
|
|
Enable support for a 52-bit physical address space, introduced as
|
|
part of the ARMv8.2-LPA extension.
|
|
|
|
With this enabled, the kernel will also continue to work on CPUs that
|
|
do not support ARMv8.2-LPA, but with some added memory overhead (and
|
|
minor performance overhead).
|
|
|
|
endchoice
|
|
|
|
config ARM64_PA_BITS
|
|
int
|
|
default 48 if ARM64_PA_BITS_48
|
|
default 52 if ARM64_PA_BITS_52
|
|
|
|
choice
|
|
prompt "Endianness"
|
|
default CPU_LITTLE_ENDIAN
|
|
help
|
|
Select the endianness of data accesses performed by the CPU. Userspace
|
|
applications will need to be compiled and linked for the endianness
|
|
that is selected here.
|
|
|
|
config CPU_BIG_ENDIAN
|
|
bool "Build big-endian kernel"
|
|
help
|
|
Say Y if you plan on running a kernel with a big-endian userspace.
|
|
|
|
config CPU_LITTLE_ENDIAN
|
|
bool "Build little-endian kernel"
|
|
help
|
|
Say Y if you plan on running a kernel with a little-endian userspace.
|
|
This is usually the case for distributions targeting arm64.
|
|
|
|
endchoice
|
|
|
|
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
|
|
default "256"
|
|
|
|
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
|
|
|
|
config HOLES_IN_ZONE
|
|
def_bool y
|
|
|
|
source "kernel/Kconfig.hz"
|
|
|
|
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
|
|
def_bool y
|
|
|
|
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 ARCH_FLATMEM_ENABLE
|
|
def_bool !NUMA
|
|
|
|
config HAVE_ARCH_PFN_VALID
|
|
def_bool y
|
|
|
|
config HW_PERF_EVENTS
|
|
def_bool y
|
|
depends on ARM_PMU
|
|
|
|
config SYS_SUPPORTS_HUGETLBFS
|
|
def_bool y
|
|
|
|
config ARCH_WANT_HUGE_PMD_SHARE
|
|
|
|
config ARCH_HAS_CACHE_LINE_SIZE
|
|
def_bool y
|
|
|
|
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
|
|
def_bool y if PGTABLE_LEVELS > 2
|
|
|
|
# Supported by clang >= 7.0
|
|
config CC_HAVE_SHADOW_CALL_STACK
|
|
def_bool $(cc-option, -fsanitize=shadow-call-stack -ffixed-x18)
|
|
|
|
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
|
|
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 KEXEC_FILE
|
|
bool "kexec file based system call"
|
|
select KEXEC_CORE
|
|
help
|
|
This is new version of kexec system call. This system call is
|
|
file based and takes file descriptors as system call argument
|
|
for kernel and initramfs as opposed to list of segments as
|
|
accepted by previous system call.
|
|
|
|
config KEXEC_SIG
|
|
bool "Verify kernel signature during kexec_file_load() syscall"
|
|
depends on KEXEC_FILE
|
|
help
|
|
Select this option to verify a signature with loaded kernel
|
|
image. If configured, any attempt of loading a image without
|
|
valid signature will fail.
|
|
|
|
In addition to that option, you need to enable signature
|
|
verification for the corresponding kernel image type being
|
|
loaded in order for this to work.
|
|
|
|
config KEXEC_IMAGE_VERIFY_SIG
|
|
bool "Enable Image signature verification support"
|
|
default y
|
|
depends on KEXEC_SIG
|
|
depends on EFI && SIGNED_PE_FILE_VERIFICATION
|
|
help
|
|
Enable Image signature verification support.
|
|
|
|
comment "Support for PE file signature verification disabled"
|
|
depends on KEXEC_SIG
|
|
depends on !EFI || !SIGNED_PE_FILE_VERIFICATION
|
|
|
|
config CRASH_DUMP
|
|
bool "Build kdump crash kernel"
|
|
help
|
|
Generate crash dump after being started by kexec. This should
|
|
be normally only set in special crash dump kernels which are
|
|
loaded in the main kernel with kexec-tools into a specially
|
|
reserved region and then later executed after a crash by
|
|
kdump/kexec.
|
|
|
|
For more details see Documentation/admin-guide/kdump/kdump.rst
|
|
|
|
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.
|
|
|
|
config UNMAP_KERNEL_AT_EL0
|
|
bool "Unmap kernel when running in userspace (aka \"KAISER\")" if EXPERT
|
|
default y
|
|
help
|
|
Speculation attacks against some high-performance processors can
|
|
be used to bypass MMU permission checks and leak kernel data to
|
|
userspace. This can be defended against by unmapping the kernel
|
|
when running in userspace, mapping it back in on exception entry
|
|
via a trampoline page in the vector table.
|
|
|
|
If unsure, say Y.
|
|
|
|
config RODATA_FULL_DEFAULT_ENABLED
|
|
bool "Apply r/o permissions of VM areas also to their linear aliases"
|
|
default y
|
|
help
|
|
Apply read-only attributes of VM areas to the linear alias of
|
|
the backing pages as well. This prevents code or read-only data
|
|
from being modified (inadvertently or intentionally) via another
|
|
mapping of the same memory page. This additional enhancement can
|
|
be turned off at runtime by passing rodata=[off|on] (and turned on
|
|
with rodata=full if this option is set to 'n')
|
|
|
|
This requires the linear region to be mapped down to pages,
|
|
which may adversely affect performance in some cases.
|
|
|
|
config ARM64_SW_TTBR0_PAN
|
|
bool "Emulate Privileged Access Never using TTBR0_EL1 switching"
|
|
help
|
|
Enabling this option prevents the kernel from accessing
|
|
user-space memory directly by pointing TTBR0_EL1 to a reserved
|
|
zeroed area and reserved ASID. The user access routines
|
|
restore the valid TTBR0_EL1 temporarily.
|
|
|
|
config ARM64_TAGGED_ADDR_ABI
|
|
bool "Enable the tagged user addresses syscall ABI"
|
|
default y
|
|
help
|
|
When this option is enabled, user applications can opt in to a
|
|
relaxed ABI via prctl() allowing tagged addresses to be passed
|
|
to system calls as pointer arguments. For details, see
|
|
Documentation/arm64/tagged-address-abi.rst.
|
|
|
|
menuconfig COMPAT
|
|
bool "Kernel support for 32-bit EL0"
|
|
depends on ARM64_4K_PAGES || EXPERT
|
|
select COMPAT_BINFMT_ELF if 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.
|
|
|
|
if COMPAT
|
|
|
|
config KUSER_HELPERS
|
|
bool "Enable kuser helpers page for 32-bit applications"
|
|
default y
|
|
help
|
|
Warning: disabling this option may break 32-bit user programs.
|
|
|
|
Provide kuser helpers to compat tasks. The kernel provides
|
|
helper code to userspace in read only form at a fixed location
|
|
to allow userspace to be independent of the CPU type fitted to
|
|
the system. This permits binaries to be run on ARMv4 through
|
|
to ARMv8 without modification.
|
|
|
|
See Documentation/arm/kernel_user_helpers.rst for details.
|
|
|
|
However, the fixed address nature of these helpers can be used
|
|
by ROP (return orientated programming) authors when creating
|
|
exploits.
|
|
|
|
If all of the binaries and libraries which run on your platform
|
|
are built specifically for your platform, and make no use of
|
|
these helpers, then you can turn this option off to hinder
|
|
such exploits. However, in that case, if a binary or library
|
|
relying on those helpers is run, it will not function correctly.
|
|
|
|
Say N here only if you are absolutely certain that you do not
|
|
need these helpers; otherwise, the safe option is to say Y.
|
|
|
|
config COMPAT_VDSO
|
|
bool "Enable vDSO for 32-bit applications"
|
|
depends on !CPU_BIG_ENDIAN && "$(CROSS_COMPILE_COMPAT)" != ""
|
|
select GENERIC_COMPAT_VDSO
|
|
default y
|
|
help
|
|
Place in the process address space of 32-bit applications an
|
|
ELF shared object providing fast implementations of gettimeofday
|
|
and clock_gettime.
|
|
|
|
You must have a 32-bit build of glibc 2.22 or later for programs
|
|
to seamlessly take advantage of this.
|
|
|
|
config THUMB2_COMPAT_VDSO
|
|
bool "Compile the 32-bit vDSO for Thumb-2 mode" if EXPERT
|
|
depends on COMPAT_VDSO
|
|
default y
|
|
help
|
|
Compile the compat vDSO with '-mthumb -fomit-frame-pointer' if y,
|
|
otherwise with '-marm'.
|
|
|
|
menuconfig ARMV8_DEPRECATED
|
|
bool "Emulate deprecated/obsolete ARMv8 instructions"
|
|
depends on SYSCTL
|
|
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.
|
|
This feature can be controlled at runtime with the abi.swp
|
|
sysctl which is disabled by default.
|
|
|
|
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. This feature can be
|
|
controlled at runtime with the abi.cp15_barrier sysctl.
|
|
|
|
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. This feature can be controlled
|
|
at runtime with the abi.setend sysctl.
|
|
|
|
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
|
|
|
|
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
|
|
default ARM64_USE_LSE_ATOMICS
|
|
depends on $(as-instr,.arch_extension lse)
|
|
|
|
config ARM64_USE_LSE_ATOMICS
|
|
bool "Atomic instructions"
|
|
depends on JUMP_LABEL
|
|
default y
|
|
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 in order for the new instructions
|
|
to be used.
|
|
|
|
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 overridden 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.
|
|
|
|
config ARM64_PMEM
|
|
bool "Enable support for persistent memory"
|
|
select ARCH_HAS_PMEM_API
|
|
select ARCH_HAS_UACCESS_FLUSHCACHE
|
|
help
|
|
Say Y to enable support for the persistent memory API based on the
|
|
ARMv8.2 DCPoP feature.
|
|
|
|
The feature is detected at runtime, and the kernel will use DC CVAC
|
|
operations if DC CVAP is not supported (following the behaviour of
|
|
DC CVAP itself if the system does not define a point of persistence).
|
|
|
|
config ARM64_RAS_EXTN
|
|
bool "Enable support for RAS CPU Extensions"
|
|
default y
|
|
help
|
|
CPUs that support the Reliability, Availability and Serviceability
|
|
(RAS) Extensions, part of ARMv8.2 are able to track faults and
|
|
errors, classify them and report them to software.
|
|
|
|
On CPUs with these extensions system software can use additional
|
|
barriers to determine if faults are pending and read the
|
|
classification from a new set of registers.
|
|
|
|
Selecting this feature will allow the kernel to use these barriers
|
|
and access the new registers if the system supports the extension.
|
|
Platform RAS features may additionally depend on firmware support.
|
|
|
|
config ARM64_CNP
|
|
bool "Enable support for Common Not Private (CNP) translations"
|
|
default y
|
|
depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN
|
|
help
|
|
Common Not Private (CNP) allows translation table entries to
|
|
be shared between different PEs in the same inner shareable
|
|
domain, so the hardware can use this fact to optimise the
|
|
caching of such entries in the TLB.
|
|
|
|
Selecting this option allows the CNP feature to be detected
|
|
at runtime, and does not affect PEs that do not implement
|
|
this feature.
|
|
|
|
endmenu
|
|
|
|
menu "ARMv8.3 architectural features"
|
|
|
|
config ARM64_PTR_AUTH
|
|
bool "Enable support for pointer authentication"
|
|
default y
|
|
depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC
|
|
# Modern compilers insert a .note.gnu.property section note for PAC
|
|
# which is only understood by binutils starting with version 2.33.1.
|
|
depends on LD_IS_LLD || LD_VERSION >= 233010000 || (CC_IS_GCC && GCC_VERSION < 90100)
|
|
depends on !CC_IS_CLANG || AS_HAS_CFI_NEGATE_RA_STATE
|
|
depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
|
|
help
|
|
Pointer authentication (part of the ARMv8.3 Extensions) provides
|
|
instructions for signing and authenticating pointers against secret
|
|
keys, which can be used to mitigate Return Oriented Programming (ROP)
|
|
and other attacks.
|
|
|
|
This option enables these instructions at EL0 (i.e. for userspace).
|
|
Choosing this option will cause the kernel to initialise secret keys
|
|
for each process at exec() time, with these keys being
|
|
context-switched along with the process.
|
|
|
|
If the compiler supports the -mbranch-protection or
|
|
-msign-return-address flag (e.g. GCC 7 or later), then this option
|
|
will also cause the kernel itself to be compiled with return address
|
|
protection. In this case, and if the target hardware is known to
|
|
support pointer authentication, then CONFIG_STACKPROTECTOR can be
|
|
disabled with minimal loss of protection.
|
|
|
|
The feature is detected at runtime. If the feature is not present in
|
|
hardware it will not be advertised to userspace/KVM guest nor will it
|
|
be enabled.
|
|
|
|
If the feature is present on the boot CPU but not on a late CPU, then
|
|
the late CPU will be parked. Also, if the boot CPU does not have
|
|
address auth and the late CPU has then the late CPU will still boot
|
|
but with the feature disabled. On such a system, this option should
|
|
not be selected.
|
|
|
|
This feature works with FUNCTION_GRAPH_TRACER option only if
|
|
DYNAMIC_FTRACE_WITH_REGS is enabled.
|
|
|
|
config CC_HAS_BRANCH_PROT_PAC_RET
|
|
# GCC 9 or later, clang 8 or later
|
|
def_bool $(cc-option,-mbranch-protection=pac-ret+leaf)
|
|
|
|
config CC_HAS_SIGN_RETURN_ADDRESS
|
|
# GCC 7, 8
|
|
def_bool $(cc-option,-msign-return-address=all)
|
|
|
|
config AS_HAS_PAC
|
|
def_bool $(cc-option,-Wa$(comma)-march=armv8.3-a)
|
|
|
|
config AS_HAS_CFI_NEGATE_RA_STATE
|
|
def_bool $(as-instr,.cfi_startproc\n.cfi_negate_ra_state\n.cfi_endproc\n)
|
|
|
|
endmenu
|
|
|
|
menu "ARMv8.4 architectural features"
|
|
|
|
config ARM64_AMU_EXTN
|
|
bool "Enable support for the Activity Monitors Unit CPU extension"
|
|
default y
|
|
help
|
|
The activity monitors extension is an optional extension introduced
|
|
by the ARMv8.4 CPU architecture. This enables support for version 1
|
|
of the activity monitors architecture, AMUv1.
|
|
|
|
To enable the use of this extension on CPUs that implement it, say Y.
|
|
|
|
Note that for architectural reasons, firmware _must_ implement AMU
|
|
support when running on CPUs that present the activity monitors
|
|
extension. The required support is present in:
|
|
* Version 1.5 and later of the ARM Trusted Firmware
|
|
|
|
For kernels that have this configuration enabled but boot with broken
|
|
firmware, you may need to say N here until the firmware is fixed.
|
|
Otherwise you may experience firmware panics or lockups when
|
|
accessing the counter registers. Even if you are not observing these
|
|
symptoms, the values returned by the register reads might not
|
|
correctly reflect reality. Most commonly, the value read will be 0,
|
|
indicating that the counter is not enabled.
|
|
|
|
config AS_HAS_ARMV8_4
|
|
def_bool $(cc-option,-Wa$(comma)-march=armv8.4-a)
|
|
|
|
config ARM64_TLB_RANGE
|
|
bool "Enable support for tlbi range feature"
|
|
default y
|
|
depends on AS_HAS_ARMV8_4
|
|
help
|
|
ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a
|
|
range of input addresses.
|
|
|
|
The feature introduces new assembly instructions, and they were
|
|
support when binutils >= 2.30.
|
|
|
|
endmenu
|
|
|
|
menu "ARMv8.5 architectural features"
|
|
|
|
config ARM64_BTI
|
|
bool "Branch Target Identification support"
|
|
default y
|
|
help
|
|
Branch Target Identification (part of the ARMv8.5 Extensions)
|
|
provides a mechanism to limit the set of locations to which computed
|
|
branch instructions such as BR or BLR can jump.
|
|
|
|
To make use of BTI on CPUs that support it, say Y.
|
|
|
|
BTI is intended to provide complementary protection to other control
|
|
flow integrity protection mechanisms, such as the Pointer
|
|
authentication mechanism provided as part of the ARMv8.3 Extensions.
|
|
For this reason, it does not make sense to enable this option without
|
|
also enabling support for pointer authentication. Thus, when
|
|
enabling this option you should also select ARM64_PTR_AUTH=y.
|
|
|
|
Userspace binaries must also be specifically compiled to make use of
|
|
this mechanism. If you say N here or the hardware does not support
|
|
BTI, such binaries can still run, but you get no additional
|
|
enforcement of branch destinations.
|
|
|
|
config ARM64_BTI_KERNEL
|
|
bool "Use Branch Target Identification for kernel"
|
|
default y
|
|
depends on ARM64_BTI
|
|
depends on ARM64_PTR_AUTH
|
|
depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
|
|
depends on !CC_IS_GCC || GCC_VERSION >= 100100
|
|
# https://reviews.llvm.org/rGb8ae3fdfa579dbf366b1bb1cbfdbf8c51db7fa55
|
|
depends on !CC_IS_CLANG || CLANG_VERSION >= 100001
|
|
depends on !(CC_IS_CLANG && GCOV_KERNEL)
|
|
depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
|
|
help
|
|
Build the kernel with Branch Target Identification annotations
|
|
and enable enforcement of this for kernel code. When this option
|
|
is enabled and the system supports BTI all kernel code including
|
|
modular code must have BTI enabled.
|
|
|
|
config CC_HAS_BRANCH_PROT_PAC_RET_BTI
|
|
# GCC 9 or later, clang 8 or later
|
|
def_bool $(cc-option,-mbranch-protection=pac-ret+leaf+bti)
|
|
|
|
config ARM64_E0PD
|
|
bool "Enable support for E0PD"
|
|
default y
|
|
help
|
|
E0PD (part of the ARMv8.5 extensions) allows us to ensure
|
|
that EL0 accesses made via TTBR1 always fault in constant time,
|
|
providing similar benefits to KASLR as those provided by KPTI, but
|
|
with lower overhead and without disrupting legitimate access to
|
|
kernel memory such as SPE.
|
|
|
|
This option enables E0PD for TTBR1 where available.
|
|
|
|
config ARCH_RANDOM
|
|
bool "Enable support for random number generation"
|
|
default y
|
|
help
|
|
Random number generation (part of the ARMv8.5 Extensions)
|
|
provides a high bandwidth, cryptographically secure
|
|
hardware random number generator.
|
|
|
|
endmenu
|
|
|
|
config ARM64_SVE
|
|
bool "ARM Scalable Vector Extension support"
|
|
default y
|
|
depends on !KVM || ARM64_VHE
|
|
help
|
|
The Scalable Vector Extension (SVE) is an extension to the AArch64
|
|
execution state which complements and extends the SIMD functionality
|
|
of the base architecture to support much larger vectors and to enable
|
|
additional vectorisation opportunities.
|
|
|
|
To enable use of this extension on CPUs that implement it, say Y.
|
|
|
|
On CPUs that support the SVE2 extensions, this option will enable
|
|
those too.
|
|
|
|
Note that for architectural reasons, firmware _must_ implement SVE
|
|
support when running on SVE capable hardware. The required support
|
|
is present in:
|
|
|
|
* version 1.5 and later of the ARM Trusted Firmware
|
|
* the AArch64 boot wrapper since commit 5e1261e08abf
|
|
("bootwrapper: SVE: Enable SVE for EL2 and below").
|
|
|
|
For other firmware implementations, consult the firmware documentation
|
|
or vendor.
|
|
|
|
If you need the kernel to boot on SVE-capable hardware with broken
|
|
firmware, you may need to say N here until you get your firmware
|
|
fixed. Otherwise, you may experience firmware panics or lockups when
|
|
booting the kernel. If unsure and you are not observing these
|
|
symptoms, you should assume that it is safe to say Y.
|
|
|
|
CPUs that support SVE are architecturally required to support the
|
|
Virtualization Host Extensions (VHE), so the kernel makes no
|
|
provision for supporting SVE alongside KVM without VHE enabled.
|
|
Thus, you will need to enable CONFIG_ARM64_VHE if you want to support
|
|
KVM in the same kernel image.
|
|
|
|
config ARM64_MODULE_PLTS
|
|
bool "Use PLTs to allow module memory to spill over into vmalloc area"
|
|
depends on MODULES
|
|
select HAVE_MOD_ARCH_SPECIFIC
|
|
help
|
|
Allocate PLTs when loading modules so that jumps and calls whose
|
|
targets are too far away for their relative offsets to be encoded
|
|
in the instructions themselves can be bounced via veneers in the
|
|
module's PLT. This allows modules to be allocated in the generic
|
|
vmalloc area after the dedicated module memory area has been
|
|
exhausted.
|
|
|
|
When running with address space randomization (KASLR), the module
|
|
region itself may be too far away for ordinary relative jumps and
|
|
calls, and so in that case, module PLTs are required and cannot be
|
|
disabled.
|
|
|
|
Specific errata workaround(s) might also force module PLTs to be
|
|
enabled (ARM64_ERRATUM_843419).
|
|
|
|
config ARM64_PSEUDO_NMI
|
|
bool "Support for NMI-like interrupts"
|
|
select ARM_GIC_V3
|
|
help
|
|
Adds support for mimicking Non-Maskable Interrupts through the use of
|
|
GIC interrupt priority. This support requires version 3 or later of
|
|
ARM GIC.
|
|
|
|
This high priority configuration for interrupts needs to be
|
|
explicitly enabled by setting the kernel parameter
|
|
"irqchip.gicv3_pseudo_nmi" to 1.
|
|
|
|
If unsure, say N
|
|
|
|
if ARM64_PSEUDO_NMI
|
|
config ARM64_DEBUG_PRIORITY_MASKING
|
|
bool "Debug interrupt priority masking"
|
|
help
|
|
This adds runtime checks to functions enabling/disabling
|
|
interrupts when using priority masking. The additional checks verify
|
|
the validity of ICC_PMR_EL1 when calling concerned functions.
|
|
|
|
If unsure, say N
|
|
endif
|
|
|
|
config RELOCATABLE
|
|
bool "Build a relocatable kernel image" if EXPERT
|
|
select ARCH_HAS_RELR
|
|
default y
|
|
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 over a 4 GB range"
|
|
depends on RANDOMIZE_BASE
|
|
default y
|
|
help
|
|
Randomizes the location of the module region inside a 4 GB window
|
|
covering the core kernel. This way, it is less likely 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.
|
|
|
|
config CC_HAVE_STACKPROTECTOR_SYSREG
|
|
def_bool $(cc-option,-mstack-protector-guard=sysreg -mstack-protector-guard-reg=sp_el0 -mstack-protector-guard-offset=0)
|
|
|
|
config STACKPROTECTOR_PER_TASK
|
|
def_bool y
|
|
depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG
|
|
|
|
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"
|
|
depends on CMDLINE != ""
|
|
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
|
|
depends on KERNEL_MODE_NEON
|
|
select ARCH_SUPPORTS_ACPI
|
|
select LIBFDT
|
|
select UCS2_STRING
|
|
select EFI_PARAMS_FROM_FDT
|
|
select EFI_RUNTIME_WRAPPERS
|
|
select EFI_STUB
|
|
select EFI_GENERIC_STUB
|
|
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
|
|
|
|
config SYSVIPC_COMPAT
|
|
def_bool y
|
|
depends on COMPAT && SYSVIPC
|
|
|
|
config ARCH_ENABLE_HUGEPAGE_MIGRATION
|
|
def_bool y
|
|
depends on HUGETLB_PAGE && MIGRATION
|
|
|
|
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
|
|
|
|
source "drivers/firmware/Kconfig"
|
|
|
|
source "drivers/acpi/Kconfig"
|
|
|
|
source "arch/arm64/kvm/Kconfig"
|
|
|
|
if CRYPTO
|
|
source "arch/arm64/crypto/Kconfig"
|
|
endif
|