# SPDX-License-Identifier: GPL-2.0
|
config MMU
|
def_bool y
|
|
config ZONE_DMA
|
def_bool y
|
|
config CPU_BIG_ENDIAN
|
def_bool y
|
|
config LOCKDEP_SUPPORT
|
def_bool y
|
|
config STACKTRACE_SUPPORT
|
def_bool y
|
|
config ARCH_HAS_ILOG2_U32
|
def_bool n
|
|
config ARCH_HAS_ILOG2_U64
|
def_bool n
|
|
config GENERIC_HWEIGHT
|
def_bool y
|
|
config GENERIC_BUG
|
def_bool y if BUG
|
|
config GENERIC_BUG_RELATIVE_POINTERS
|
def_bool y
|
|
config GENERIC_LOCKBREAK
|
def_bool y if PREEMPTION
|
|
config PGSTE
|
def_bool y if KVM
|
|
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
|
def_bool y
|
|
config AUDIT_ARCH
|
def_bool y
|
|
config NO_IOPORT_MAP
|
def_bool y
|
|
config PCI_QUIRKS
|
def_bool n
|
|
config ARCH_SUPPORTS_UPROBES
|
def_bool y
|
|
config KASAN_SHADOW_OFFSET
|
hex
|
depends on KASAN
|
default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
|
default 0x30000000000
|
|
config S390
|
def_bool y
|
select ARCH_BINFMT_ELF_STATE
|
select ARCH_HAS_DEBUG_VM_PGTABLE
|
select ARCH_HAS_DEBUG_WX
|
select ARCH_HAS_DEVMEM_IS_ALLOWED
|
select ARCH_HAS_ELF_RANDOMIZE
|
select ARCH_HAS_FORTIFY_SOURCE
|
select ARCH_HAS_GCOV_PROFILE_ALL
|
select ARCH_HAS_GIGANTIC_PAGE
|
select ARCH_HAS_KCOV
|
select ARCH_HAS_MEM_ENCRYPT
|
select ARCH_HAS_PTE_SPECIAL
|
select ARCH_HAS_SET_MEMORY
|
select ARCH_HAS_STRICT_KERNEL_RWX
|
select ARCH_HAS_STRICT_MODULE_RWX
|
select ARCH_HAS_SYSCALL_WRAPPER
|
select ARCH_HAS_UBSAN_SANITIZE_ALL
|
select ARCH_HAS_VDSO_DATA
|
select ARCH_HAVE_NMI_SAFE_CMPXCHG
|
select ARCH_INLINE_READ_LOCK
|
select ARCH_INLINE_READ_LOCK_BH
|
select ARCH_INLINE_READ_LOCK_IRQ
|
select ARCH_INLINE_READ_LOCK_IRQSAVE
|
select ARCH_INLINE_READ_TRYLOCK
|
select ARCH_INLINE_READ_UNLOCK
|
select ARCH_INLINE_READ_UNLOCK_BH
|
select ARCH_INLINE_READ_UNLOCK_IRQ
|
select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
|
select ARCH_INLINE_SPIN_LOCK
|
select ARCH_INLINE_SPIN_LOCK_BH
|
select ARCH_INLINE_SPIN_LOCK_IRQ
|
select ARCH_INLINE_SPIN_LOCK_IRQSAVE
|
select ARCH_INLINE_SPIN_TRYLOCK
|
select ARCH_INLINE_SPIN_TRYLOCK_BH
|
select ARCH_INLINE_SPIN_UNLOCK
|
select ARCH_INLINE_SPIN_UNLOCK_BH
|
select ARCH_INLINE_SPIN_UNLOCK_IRQ
|
select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
|
select ARCH_INLINE_WRITE_LOCK
|
select ARCH_INLINE_WRITE_LOCK_BH
|
select ARCH_INLINE_WRITE_LOCK_IRQ
|
select ARCH_INLINE_WRITE_LOCK_IRQSAVE
|
select ARCH_INLINE_WRITE_TRYLOCK
|
select ARCH_INLINE_WRITE_UNLOCK
|
select ARCH_INLINE_WRITE_UNLOCK_BH
|
select ARCH_INLINE_WRITE_UNLOCK_IRQ
|
select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
|
select ARCH_STACKWALK
|
select ARCH_SUPPORTS_ATOMIC_RMW
|
select ARCH_SUPPORTS_NUMA_BALANCING
|
select ARCH_USE_BUILTIN_BSWAP
|
select ARCH_USE_CMPXCHG_LOCKREF
|
select ARCH_WANTS_DYNAMIC_TASK_STRUCT
|
select ARCH_WANT_DEFAULT_BPF_JIT
|
select ARCH_WANT_IPC_PARSE_VERSION
|
select BUILDTIME_TABLE_SORT
|
select CLONE_BACKWARDS2
|
select DMA_OPS if PCI
|
select DYNAMIC_FTRACE if FUNCTION_TRACER
|
select GENERIC_CLOCKEVENTS
|
select GENERIC_CPU_AUTOPROBE
|
select GENERIC_CPU_VULNERABILITIES
|
select GENERIC_FIND_FIRST_BIT
|
select GENERIC_GETTIMEOFDAY
|
select GENERIC_PTDUMP
|
select GENERIC_SMP_IDLE_THREAD
|
select GENERIC_TIME_VSYSCALL
|
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
|
select HAVE_ARCH_AUDITSYSCALL
|
select HAVE_ARCH_JUMP_LABEL
|
select HAVE_ARCH_JUMP_LABEL_RELATIVE
|
select HAVE_ARCH_KASAN
|
select HAVE_ARCH_KASAN_VMALLOC
|
select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
|
select HAVE_ARCH_SECCOMP_FILTER
|
select HAVE_ARCH_SOFT_DIRTY
|
select HAVE_ARCH_TRACEHOOK
|
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
|
select HAVE_ARCH_VMAP_STACK
|
select HAVE_ASM_MODVERSIONS
|
select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
|
select HAVE_CMPXCHG_DOUBLE
|
select HAVE_CMPXCHG_LOCAL
|
select HAVE_DEBUG_KMEMLEAK
|
select HAVE_DMA_CONTIGUOUS
|
select HAVE_DYNAMIC_FTRACE
|
select HAVE_DYNAMIC_FTRACE_WITH_REGS
|
select HAVE_FAST_GUP
|
select HAVE_EFFICIENT_UNALIGNED_ACCESS
|
select HAVE_FENTRY
|
select HAVE_FTRACE_MCOUNT_RECORD
|
select HAVE_FUNCTION_ERROR_INJECTION
|
select HAVE_FUNCTION_GRAPH_TRACER
|
select HAVE_FUNCTION_TRACER
|
select HAVE_FUTEX_CMPXCHG if FUTEX
|
select HAVE_GCC_PLUGINS
|
select HAVE_GENERIC_VDSO
|
select HAVE_IOREMAP_PROT if PCI
|
select HAVE_IRQ_EXIT_ON_IRQ_STACK
|
select HAVE_KERNEL_BZIP2
|
select HAVE_KERNEL_GZIP
|
select HAVE_KERNEL_LZ4
|
select HAVE_KERNEL_LZMA
|
select HAVE_KERNEL_LZO
|
select HAVE_KERNEL_UNCOMPRESSED
|
select HAVE_KERNEL_XZ
|
select HAVE_KPROBES
|
select HAVE_KPROBES_ON_FTRACE
|
select HAVE_KRETPROBES
|
select HAVE_KVM
|
select HAVE_LIVEPATCH
|
select HAVE_PERF_REGS
|
select HAVE_PERF_USER_STACK_DUMP
|
select HAVE_MEMBLOCK_PHYS_MAP
|
select MMU_GATHER_NO_GATHER
|
select HAVE_MOD_ARCH_SPECIFIC
|
select HAVE_NOP_MCOUNT
|
select HAVE_OPROFILE
|
select HAVE_PCI
|
select HAVE_PERF_EVENTS
|
select MMU_GATHER_RCU_TABLE_FREE
|
select HAVE_REGS_AND_STACK_ACCESS_API
|
select HAVE_RELIABLE_STACKTRACE
|
select HAVE_RSEQ
|
select HAVE_SYSCALL_TRACEPOINTS
|
select HAVE_VIRT_CPU_ACCOUNTING
|
select IOMMU_HELPER if PCI
|
select IOMMU_SUPPORT if PCI
|
select MODULES_USE_ELF_RELA
|
select NEED_DMA_MAP_STATE if PCI
|
select NEED_SG_DMA_LENGTH if PCI
|
select OLD_SIGACTION
|
select OLD_SIGSUSPEND3
|
select PCI_DOMAINS if PCI
|
select PCI_MSI if PCI
|
select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
|
select SET_FS
|
select SPARSE_IRQ
|
select SYSCTL_EXCEPTION_TRACE
|
select THREAD_INFO_IN_TASK
|
select TTY
|
select VIRT_CPU_ACCOUNTING
|
select ARCH_HAS_SCALED_CPUTIME
|
select HAVE_NMI
|
select ARCH_HAS_FORCE_DMA_UNENCRYPTED
|
select SWIOTLB
|
select GENERIC_ALLOCATOR
|
imply IMA_SECURE_AND_OR_TRUSTED_BOOT
|
|
|
config SCHED_OMIT_FRAME_POINTER
|
def_bool y
|
|
config PGTABLE_LEVELS
|
int
|
default 5
|
|
source "kernel/livepatch/Kconfig"
|
|
menu "Processor type and features"
|
|
config HAVE_MARCH_Z900_FEATURES
|
def_bool n
|
|
config HAVE_MARCH_Z990_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z900_FEATURES
|
|
config HAVE_MARCH_Z9_109_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z990_FEATURES
|
|
config HAVE_MARCH_Z10_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z9_109_FEATURES
|
|
config HAVE_MARCH_Z196_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z10_FEATURES
|
|
config HAVE_MARCH_ZEC12_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z196_FEATURES
|
|
config HAVE_MARCH_Z13_FEATURES
|
def_bool n
|
select HAVE_MARCH_ZEC12_FEATURES
|
|
config HAVE_MARCH_Z14_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z13_FEATURES
|
|
config HAVE_MARCH_Z15_FEATURES
|
def_bool n
|
select HAVE_MARCH_Z14_FEATURES
|
|
choice
|
prompt "Processor type"
|
default MARCH_Z196
|
|
config MARCH_Z900
|
bool "IBM zSeries model z800 and z900"
|
select HAVE_MARCH_Z900_FEATURES
|
depends on $(cc-option,-march=z900)
|
help
|
Select this to enable optimizations for model z800/z900 (2064 and
|
2066 series). This will enable some optimizations that are not
|
available on older ESA/390 (31 Bit) only CPUs.
|
|
config MARCH_Z990
|
bool "IBM zSeries model z890 and z990"
|
select HAVE_MARCH_Z990_FEATURES
|
depends on $(cc-option,-march=z990)
|
help
|
Select this to enable optimizations for model z890/z990 (2084 and
|
2086 series). The kernel will be slightly faster but will not work
|
on older machines.
|
|
config MARCH_Z9_109
|
bool "IBM System z9"
|
select HAVE_MARCH_Z9_109_FEATURES
|
depends on $(cc-option,-march=z9-109)
|
help
|
Select this to enable optimizations for IBM System z9 (2094 and
|
2096 series). The kernel will be slightly faster but will not work
|
on older machines.
|
|
config MARCH_Z10
|
bool "IBM System z10"
|
select HAVE_MARCH_Z10_FEATURES
|
depends on $(cc-option,-march=z10)
|
help
|
Select this to enable optimizations for IBM System z10 (2097 and
|
2098 series). The kernel will be slightly faster but will not work
|
on older machines.
|
|
config MARCH_Z196
|
bool "IBM zEnterprise 114 and 196"
|
select HAVE_MARCH_Z196_FEATURES
|
depends on $(cc-option,-march=z196)
|
help
|
Select this to enable optimizations for IBM zEnterprise 114 and 196
|
(2818 and 2817 series). The kernel will be slightly faster but will
|
not work on older machines.
|
|
config MARCH_ZEC12
|
bool "IBM zBC12 and zEC12"
|
select HAVE_MARCH_ZEC12_FEATURES
|
depends on $(cc-option,-march=zEC12)
|
help
|
Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
|
2827 series). The kernel will be slightly faster but will not work on
|
older machines.
|
|
config MARCH_Z13
|
bool "IBM z13s and z13"
|
select HAVE_MARCH_Z13_FEATURES
|
depends on $(cc-option,-march=z13)
|
help
|
Select this to enable optimizations for IBM z13s and z13 (2965 and
|
2964 series). The kernel will be slightly faster but will not work on
|
older machines.
|
|
config MARCH_Z14
|
bool "IBM z14 ZR1 and z14"
|
select HAVE_MARCH_Z14_FEATURES
|
depends on $(cc-option,-march=z14)
|
help
|
Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
|
and 3906 series). The kernel will be slightly faster but will not
|
work on older machines.
|
|
config MARCH_Z15
|
bool "IBM z15"
|
select HAVE_MARCH_Z15_FEATURES
|
depends on $(cc-option,-march=z15)
|
help
|
Select this to enable optimizations for IBM z15 (8562
|
and 8561 series). The kernel will be slightly faster but will not
|
work on older machines.
|
|
endchoice
|
|
config MARCH_Z900_TUNE
|
def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
|
|
config MARCH_Z990_TUNE
|
def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
|
|
config MARCH_Z9_109_TUNE
|
def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
|
|
config MARCH_Z10_TUNE
|
def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
|
|
config MARCH_Z196_TUNE
|
def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
|
|
config MARCH_ZEC12_TUNE
|
def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
|
|
config MARCH_Z13_TUNE
|
def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
|
|
config MARCH_Z14_TUNE
|
def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
|
|
config MARCH_Z15_TUNE
|
def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
|
|
choice
|
prompt "Tune code generation"
|
default TUNE_DEFAULT
|
help
|
Cause the compiler to tune (-mtune) the generated code for a machine.
|
This will make the code run faster on the selected machine but
|
somewhat slower on other machines.
|
This option only changes how the compiler emits instructions, not the
|
selection of instructions itself, so the resulting kernel will run on
|
all other machines.
|
|
config TUNE_DEFAULT
|
bool "Default"
|
help
|
Tune the generated code for the target processor for which the kernel
|
will be compiled.
|
|
config TUNE_Z900
|
bool "IBM zSeries model z800 and z900"
|
depends on $(cc-option,-mtune=z900)
|
|
config TUNE_Z990
|
bool "IBM zSeries model z890 and z990"
|
depends on $(cc-option,-mtune=z990)
|
|
config TUNE_Z9_109
|
bool "IBM System z9"
|
depends on $(cc-option,-mtune=z9-109)
|
|
config TUNE_Z10
|
bool "IBM System z10"
|
depends on $(cc-option,-mtune=z10)
|
|
config TUNE_Z196
|
bool "IBM zEnterprise 114 and 196"
|
depends on $(cc-option,-mtune=z196)
|
|
config TUNE_ZEC12
|
bool "IBM zBC12 and zEC12"
|
depends on $(cc-option,-mtune=zEC12)
|
|
config TUNE_Z13
|
bool "IBM z13s and z13"
|
depends on $(cc-option,-mtune=z13)
|
|
config TUNE_Z14
|
bool "IBM z14 ZR1 and z14"
|
depends on $(cc-option,-mtune=z14)
|
|
config TUNE_Z15
|
bool "IBM z15"
|
depends on $(cc-option,-mtune=z15)
|
|
endchoice
|
|
config 64BIT
|
def_bool y
|
|
config COMPAT
|
def_bool y
|
prompt "Kernel support for 31 bit emulation"
|
select COMPAT_BINFMT_ELF if BINFMT_ELF
|
select ARCH_WANT_OLD_COMPAT_IPC
|
select COMPAT_OLD_SIGACTION
|
select HAVE_UID16
|
depends on MULTIUSER
|
help
|
Select this option if you want to enable your system kernel to
|
handle system-calls from ELF binaries for 31 bit ESA. This option
|
(and some other stuff like libraries and such) is needed for
|
executing 31 bit applications. It is safe to say "Y".
|
|
config SYSVIPC_COMPAT
|
def_bool y if COMPAT && SYSVIPC
|
|
config SMP
|
def_bool y
|
|
config NR_CPUS
|
int "Maximum number of CPUs (2-512)"
|
range 2 512
|
default "64"
|
help
|
This allows you to specify the maximum number of CPUs which this
|
kernel will support. The maximum supported value is 512 and the
|
minimum value which makes sense is 2.
|
|
This is purely to save memory - each supported CPU adds
|
approximately sixteen kilobytes to the kernel image.
|
|
config HOTPLUG_CPU
|
def_bool y
|
|
config NUMA
|
bool "NUMA support"
|
depends on SCHED_TOPOLOGY
|
default n
|
help
|
Enable NUMA support
|
|
This option adds NUMA support to the kernel.
|
|
config NODES_SHIFT
|
int
|
depends on NEED_MULTIPLE_NODES
|
default "1"
|
|
config SCHED_SMT
|
def_bool n
|
|
config SCHED_MC
|
def_bool n
|
|
config SCHED_BOOK
|
def_bool n
|
|
config SCHED_DRAWER
|
def_bool n
|
|
config SCHED_TOPOLOGY
|
def_bool y
|
prompt "Topology scheduler support"
|
select SCHED_SMT
|
select SCHED_MC
|
select SCHED_BOOK
|
select SCHED_DRAWER
|
help
|
Topology scheduler support improves the CPU scheduler's decision
|
making when dealing with machines that have multi-threading,
|
multiple cores or multiple books.
|
|
source "kernel/Kconfig.hz"
|
|
config KEXEC
|
def_bool y
|
select KEXEC_CORE
|
|
config KEXEC_FILE
|
bool "kexec file based system call"
|
select KEXEC_CORE
|
depends on CRYPTO
|
depends on CRYPTO_SHA256
|
depends on CRYPTO_SHA256_S390
|
help
|
Enable the kexec file based system call. In contrast to the normal
|
kexec system call this system call takes file descriptors for the
|
kernel and initramfs as arguments.
|
|
config ARCH_HAS_KEXEC_PURGATORY
|
def_bool y
|
depends on KEXEC_FILE
|
|
config KEXEC_SIG
|
bool "Verify kernel signature during kexec_file_load() syscall"
|
depends on KEXEC_FILE && MODULE_SIG_FORMAT
|
help
|
This option makes kernel signature verification mandatory for
|
the kexec_file_load() syscall.
|
|
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 ARCH_RANDOM
|
def_bool y
|
prompt "s390 architectural random number generation API"
|
help
|
Enable the s390 architectural random number generation API
|
to provide random data for all consumers within the Linux
|
kernel.
|
|
When enabled the arch_random_* functions declared in linux/random.h
|
are implemented. The implementation is based on the s390 CPACF
|
instruction subfunction TRNG which provides a real true random
|
number generator.
|
|
If unsure, say Y.
|
|
config KERNEL_NOBP
|
def_bool n
|
prompt "Enable modified branch prediction for the kernel by default"
|
help
|
If this option is selected the kernel will switch to a modified
|
branch prediction mode if the firmware interface is available.
|
The modified branch prediction mode improves the behaviour in
|
regard to speculative execution.
|
|
With the option enabled the kernel parameter "nobp=0" or "nospec"
|
can be used to run the kernel in the normal branch prediction mode.
|
|
With the option disabled the modified branch prediction mode is
|
enabled with the "nobp=1" kernel parameter.
|
|
If unsure, say N.
|
|
config EXPOLINE
|
def_bool n
|
prompt "Avoid speculative indirect branches in the kernel"
|
help
|
Compile the kernel with the expoline compiler options to guard
|
against kernel-to-user data leaks by avoiding speculative indirect
|
branches.
|
Requires a compiler with -mindirect-branch=thunk support for full
|
protection. The kernel may run slower.
|
|
If unsure, say N.
|
|
choice
|
prompt "Expoline default"
|
depends on EXPOLINE
|
default EXPOLINE_FULL
|
|
config EXPOLINE_OFF
|
bool "spectre_v2=off"
|
|
config EXPOLINE_AUTO
|
bool "spectre_v2=auto"
|
|
config EXPOLINE_FULL
|
bool "spectre_v2=on"
|
|
endchoice
|
|
config RELOCATABLE
|
bool "Build a relocatable kernel"
|
select MODULE_REL_CRCS if MODVERSIONS
|
default y
|
help
|
This builds a kernel image that retains relocation information
|
so it can be loaded at an arbitrary address.
|
The kernel is linked as a position-independent executable (PIE)
|
and contains dynamic relocations which are processed early in the
|
bootup process.
|
The relocations make the kernel image about 15% larger (compressed
|
10%), but are discarded at runtime.
|
|
config RANDOMIZE_BASE
|
bool "Randomize the address of the kernel image (KASLR)"
|
depends on RELOCATABLE
|
default y
|
help
|
In support of Kernel Address Space Layout Randomization (KASLR),
|
this randomizes the 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.
|
|
endmenu
|
|
menu "Memory setup"
|
|
config ARCH_SPARSEMEM_ENABLE
|
def_bool y
|
select SPARSEMEM_VMEMMAP_ENABLE
|
select SPARSEMEM_VMEMMAP
|
|
config ARCH_SPARSEMEM_DEFAULT
|
def_bool y
|
|
config ARCH_ENABLE_MEMORY_HOTPLUG
|
def_bool y if SPARSEMEM
|
|
config ARCH_ENABLE_MEMORY_HOTREMOVE
|
def_bool y
|
|
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
|
def_bool y
|
|
config MAX_PHYSMEM_BITS
|
int "Maximum size of supported physical memory in bits (42-53)"
|
range 42 53
|
default "46"
|
help
|
This option specifies the maximum supported size of physical memory
|
in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
|
Increasing the number of bits also increases the kernel image size.
|
By default 46 bits (64TB) are supported.
|
|
config PACK_STACK
|
def_bool y
|
prompt "Pack kernel stack"
|
help
|
This option enables the compiler option -mkernel-backchain if it
|
is available. If the option is available the compiler supports
|
the new stack layout which dramatically reduces the minimum stack
|
frame size. With an old compiler a non-leaf function needs a
|
minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
|
-mkernel-backchain the minimum size drops to 16 byte on 31 bit
|
and 24 byte on 64 bit.
|
|
Say Y if you are unsure.
|
|
config CHECK_STACK
|
def_bool y
|
depends on !VMAP_STACK
|
prompt "Detect kernel stack overflow"
|
help
|
This option enables the compiler option -mstack-guard and
|
-mstack-size if they are available. If the compiler supports them
|
it will emit additional code to each function prolog to trigger
|
an illegal operation if the kernel stack is about to overflow.
|
|
Say N if you are unsure.
|
|
config STACK_GUARD
|
int "Size of the guard area (128-1024)"
|
range 128 1024
|
depends on CHECK_STACK
|
default "256"
|
help
|
This allows you to specify the size of the guard area at the lower
|
end of the kernel stack. If the kernel stack points into the guard
|
area on function entry an illegal operation is triggered. The size
|
needs to be a power of 2. Please keep in mind that the size of an
|
interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
|
The minimum size for the stack guard should be 256 for 31 bit and
|
512 for 64 bit.
|
|
config WARN_DYNAMIC_STACK
|
def_bool n
|
prompt "Emit compiler warnings for function with dynamic stack usage"
|
help
|
This option enables the compiler option -mwarn-dynamicstack. If the
|
compiler supports this options generates warnings for functions
|
that dynamically allocate stack space using alloca.
|
|
Say N if you are unsure.
|
|
endmenu
|
|
menu "I/O subsystem"
|
|
config QDIO
|
def_tristate y
|
prompt "QDIO support"
|
help
|
This driver provides the Queued Direct I/O base support for
|
IBM System z.
|
|
To compile this driver as a module, choose M here: the
|
module will be called qdio.
|
|
If unsure, say Y.
|
|
if PCI
|
|
config PCI_NR_FUNCTIONS
|
int "Maximum number of PCI functions (1-4096)"
|
range 1 4096
|
default "128"
|
help
|
This allows you to specify the maximum number of PCI functions which
|
this kernel will support.
|
|
endif # PCI
|
|
config HAS_IOMEM
|
def_bool PCI
|
|
config CHSC_SCH
|
def_tristate m
|
prompt "Support for CHSC subchannels"
|
help
|
This driver allows usage of CHSC subchannels. A CHSC subchannel
|
is usually present on LPAR only.
|
The driver creates a device /dev/chsc, which may be used to
|
obtain I/O configuration information about the machine and
|
to issue asynchronous chsc commands (DANGEROUS).
|
You will usually only want to use this interface on a special
|
LPAR designated for system management.
|
|
To compile this driver as a module, choose M here: the
|
module will be called chsc_sch.
|
|
If unsure, say N.
|
|
config SCM_BUS
|
def_bool y
|
prompt "SCM bus driver"
|
help
|
Bus driver for Storage Class Memory.
|
|
config EADM_SCH
|
def_tristate m
|
prompt "Support for EADM subchannels"
|
depends on SCM_BUS
|
help
|
This driver allows usage of EADM subchannels. EADM subchannels act
|
as a communication vehicle for SCM increments.
|
|
To compile this driver as a module, choose M here: the
|
module will be called eadm_sch.
|
|
config VFIO_CCW
|
def_tristate n
|
prompt "Support for VFIO-CCW subchannels"
|
depends on S390_CCW_IOMMU && VFIO_MDEV
|
help
|
This driver allows usage of I/O subchannels via VFIO-CCW.
|
|
To compile this driver as a module, choose M here: the
|
module will be called vfio_ccw.
|
|
config VFIO_AP
|
def_tristate n
|
prompt "VFIO support for AP devices"
|
depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
|
depends on ZCRYPT
|
help
|
This driver grants access to Adjunct Processor (AP) devices
|
via the VFIO mediated device interface.
|
|
To compile this driver as a module, choose M here: the module
|
will be called vfio_ap.
|
|
endmenu
|
|
menu "Dump support"
|
|
config CRASH_DUMP
|
bool "kernel crash dumps"
|
select KEXEC
|
help
|
Generate crash dump after being started by kexec.
|
Crash dump kernels are loaded in the main kernel with kexec-tools
|
into a specially reserved region and then later executed after
|
a crash by kdump/kexec.
|
Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
|
This option also enables s390 zfcpdump.
|
See also <file:Documentation/s390/zfcpdump.rst>
|
|
endmenu
|
|
config CCW
|
def_bool y
|
|
config HAVE_PNETID
|
tristate
|
default (SMC || CCWGROUP)
|
|
menu "Virtualization"
|
|
config PROTECTED_VIRTUALIZATION_GUEST
|
def_bool n
|
prompt "Protected virtualization guest support"
|
select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
|
help
|
Select this option, if you want to be able to run this
|
kernel as a protected virtualization KVM guest.
|
Protected virtualization capable machines have a mini hypervisor
|
located at machine level (an ultravisor). With help of the
|
Ultravisor, KVM will be able to run "protected" VMs, special
|
VMs whose memory and management data are unavailable to KVM.
|
|
config PFAULT
|
def_bool y
|
prompt "Pseudo page fault support"
|
help
|
Select this option, if you want to use PFAULT pseudo page fault
|
handling under VM. If running native or in LPAR, this option
|
has no effect. If your VM does not support PFAULT, PAGEEX
|
pseudo page fault handling will be used.
|
Note that VM 4.2 supports PFAULT but has a bug in its
|
implementation that causes some problems.
|
Everybody who wants to run Linux under VM != VM4.2 should select
|
this option.
|
|
config CMM
|
def_tristate n
|
prompt "Cooperative memory management"
|
help
|
Select this option, if you want to enable the kernel interface
|
to reduce the memory size of the system. This is accomplished
|
by allocating pages of memory and put them "on hold". This only
|
makes sense for a system running under VM where the unused pages
|
will be reused by VM for other guest systems. The interface
|
allows an external monitor to balance memory of many systems.
|
Everybody who wants to run Linux under VM should select this
|
option.
|
|
config CMM_IUCV
|
def_bool y
|
prompt "IUCV special message interface to cooperative memory management"
|
depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
|
help
|
Select this option to enable the special message interface to
|
the cooperative memory management.
|
|
config APPLDATA_BASE
|
def_bool n
|
prompt "Linux - VM Monitor Stream, base infrastructure"
|
depends on PROC_SYSCTL
|
help
|
This provides a kernel interface for creating and updating z/VM APPLDATA
|
monitor records. The monitor records are updated at certain time
|
intervals, once the timer is started.
|
Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
|
i.e. enables or disables monitoring on the Linux side.
|
A custom interval value (in seconds) can be written to
|
/proc/appldata/interval.
|
|
Defaults are 60 seconds interval and timer off.
|
The /proc entries can also be read from, showing the current settings.
|
|
config APPLDATA_MEM
|
def_tristate m
|
prompt "Monitor memory management statistics"
|
depends on APPLDATA_BASE && VM_EVENT_COUNTERS
|
help
|
This provides memory management related data to the Linux - VM Monitor
|
Stream, like paging/swapping rate, memory utilisation, etc.
|
Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
|
APPLDATA monitor record, i.e. enables or disables monitoring this record
|
on the z/VM side.
|
|
Default is disabled.
|
The /proc entry can also be read from, showing the current settings.
|
|
This can also be compiled as a module, which will be called
|
appldata_mem.o.
|
|
config APPLDATA_OS
|
def_tristate m
|
prompt "Monitor OS statistics"
|
depends on APPLDATA_BASE
|
help
|
This provides OS related data to the Linux - VM Monitor Stream, like
|
CPU utilisation, etc.
|
Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
|
APPLDATA monitor record, i.e. enables or disables monitoring this record
|
on the z/VM side.
|
|
Default is disabled.
|
This can also be compiled as a module, which will be called
|
appldata_os.o.
|
|
config APPLDATA_NET_SUM
|
def_tristate m
|
prompt "Monitor overall network statistics"
|
depends on APPLDATA_BASE && NET
|
help
|
This provides network related data to the Linux - VM Monitor Stream,
|
currently there is only a total sum of network I/O statistics, no
|
per-interface data.
|
Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
|
APPLDATA monitor record, i.e. enables or disables monitoring this record
|
on the z/VM side.
|
|
Default is disabled.
|
This can also be compiled as a module, which will be called
|
appldata_net_sum.o.
|
|
config S390_HYPFS_FS
|
def_bool y
|
prompt "s390 hypervisor file system support"
|
select SYS_HYPERVISOR
|
help
|
This is a virtual file system intended to provide accounting
|
information in an s390 hypervisor environment.
|
|
source "arch/s390/kvm/Kconfig"
|
|
config S390_GUEST
|
def_bool y
|
prompt "s390 support for virtio devices"
|
select TTY
|
select VIRTUALIZATION
|
select VIRTIO
|
help
|
Enabling this option adds support for virtio based paravirtual device
|
drivers on s390.
|
|
Select this option if you want to run the kernel as a guest under
|
the KVM hypervisor.
|
|
endmenu
|
|
menu "Selftests"
|
|
config S390_UNWIND_SELFTEST
|
def_tristate n
|
prompt "Test unwind functions"
|
help
|
This option enables s390 specific stack unwinder testing kernel
|
module. This option is not useful for distributions or general
|
kernels, but only for kernel developers working on architecture code.
|
|
Say N if you are unsure.
|
|
endmenu
|
