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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/s390/Kconfig
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/Kconfig')
-rw-r--r--arch/s390/Kconfig929
1 files changed, 929 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
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+# SPDX-License-Identifier: GPL-2.0
+config MMU
+ 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 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 0x1C000000000000
+
+config S390
+ def_bool y
+ #
+ # Note: keep this list sorted alphabetically
+ #
+ imply IMA_SECURE_AND_OR_TRUSTED_BOOT
+ select ALTERNATE_USER_ADDRESS_SPACE
+ select ARCH_32BIT_USTAT_F_TINODE
+ select ARCH_BINFMT_ELF_STATE
+ select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
+ select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
+ select ARCH_ENABLE_MEMORY_HOTREMOVE
+ select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
+ select ARCH_HAS_CURRENT_STACK_POINTER
+ 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_FORCE_DMA_UNENCRYPTED
+ 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_SCALED_CPUTIME
+ 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_DEBUG_PAGEALLOC
+ select ARCH_SUPPORTS_HUGETLBFS
+ select ARCH_SUPPORTS_NUMA_BALANCING
+ select ARCH_USE_BUILTIN_BSWAP
+ select ARCH_USE_CMPXCHG_LOCKREF
+ select ARCH_WANTS_DYNAMIC_TASK_STRUCT
+ select ARCH_WANTS_NO_INSTR
+ 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 GCC12_NO_ARRAY_BOUNDS
+ select GENERIC_ALLOCATOR
+ select GENERIC_CPU_AUTOPROBE
+ select GENERIC_CPU_VULNERABILITIES
+ select GENERIC_ENTRY
+ select GENERIC_GETTIMEOFDAY
+ select GENERIC_PTDUMP
+ select GENERIC_SMP_IDLE_THREAD
+ select GENERIC_TIME_VSYSCALL
+ select GENERIC_VDSO_TIME_NS
+ 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 HAVE_ARCH_KCSAN
+ select HAVE_ARCH_KFENCE
+ select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
+ 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_CMPXCHG_DOUBLE
+ select HAVE_CMPXCHG_LOCAL
+ select HAVE_DEBUG_KMEMLEAK
+ select HAVE_DMA_CONTIGUOUS
+ select HAVE_DYNAMIC_FTRACE
+ select HAVE_DYNAMIC_FTRACE_WITH_ARGS
+ select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
+ select HAVE_DYNAMIC_FTRACE_WITH_REGS
+ select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
+ select HAVE_EFFICIENT_UNALIGNED_ACCESS
+ select HAVE_FAST_GUP
+ select HAVE_FENTRY
+ select HAVE_FTRACE_MCOUNT_RECORD
+ select HAVE_FUNCTION_ARG_ACCESS_API
+ select HAVE_FUNCTION_ERROR_INJECTION
+ select HAVE_FUNCTION_GRAPH_TRACER
+ select HAVE_FUNCTION_TRACER
+ select HAVE_GCC_PLUGINS
+ select HAVE_GENERIC_VDSO
+ select HAVE_IOREMAP_PROT if PCI
+ 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_KERNEL_ZSTD
+ select HAVE_KPROBES
+ select HAVE_KPROBES_ON_FTRACE
+ select HAVE_KRETPROBES
+ select HAVE_KVM
+ select HAVE_LIVEPATCH
+ select HAVE_MEMBLOCK_PHYS_MAP
+ select HAVE_MOD_ARCH_SPECIFIC
+ select HAVE_NMI
+ select HAVE_NOP_MCOUNT
+ select HAVE_PCI
+ select HAVE_PERF_EVENTS
+ select HAVE_PERF_REGS
+ select HAVE_PERF_USER_STACK_DUMP
+ select HAVE_REGS_AND_STACK_ACCESS_API
+ select HAVE_RELIABLE_STACKTRACE
+ select HAVE_RSEQ
+ select HAVE_SAMPLE_FTRACE_DIRECT
+ select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
+ select HAVE_SOFTIRQ_ON_OWN_STACK
+ select HAVE_SYSCALL_TRACEPOINTS
+ select HAVE_VIRT_CPU_ACCOUNTING
+ select HAVE_VIRT_CPU_ACCOUNTING_IDLE
+ select IOMMU_HELPER if PCI
+ select IOMMU_SUPPORT if PCI
+ select MMU_GATHER_NO_GATHER
+ select MMU_GATHER_RCU_TABLE_FREE
+ select MMU_GATHER_MERGE_VMAS
+ 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 SPARSE_IRQ
+ select SWIOTLB
+ select SYSCTL_EXCEPTION_TRACE
+ select THREAD_INFO_IN_TASK
+ select TRACE_IRQFLAGS_SUPPORT
+ select TTY
+ select VIRT_CPU_ACCOUNTING
+ select ZONE_DMA
+ # Note: keep the above list sorted alphabetically
+
+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_Z10_FEATURES
+ def_bool n
+
+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
+
+config HAVE_MARCH_Z16_FEATURES
+ def_bool n
+ select HAVE_MARCH_Z15_FEATURES
+
+choice
+ prompt "Processor type"
+ default MARCH_Z196
+
+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). This is the oldest machine generation currently supported.
+
+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.
+
+config MARCH_Z16
+ bool "IBM z16"
+ select HAVE_MARCH_Z16_FEATURES
+ depends on $(cc-option,-march=z16)
+ help
+ Select this to enable optimizations for IBM z16 (3931 and
+ 3932 series).
+
+endchoice
+
+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
+
+config MARCH_Z16_TUNE
+ def_bool TUNE_Z16 || MARCH_Z16 && 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_Z10
+ bool "IBM System 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)
+
+config TUNE_Z16
+ bool "IBM z16"
+ depends on $(cc-option,-mtune=z16)
+
+endchoice
+
+config 64BIT
+ def_bool y
+
+config COMMAND_LINE_SIZE
+ int "Maximum size of kernel command line"
+ default 4096
+ range 896 1048576
+ help
+ This allows you to specify the maximum length of the kernel command
+ line.
+
+config COMPAT
+ def_bool y
+ prompt "Kernel support for 31 bit emulation"
+ select ARCH_WANT_OLD_COMPAT_IPC
+ select COMPAT_OLD_SIGACTION
+ select HAVE_UID16
+ depends on MULTIUSER
+ depends on !CC_IS_CLANG
+ 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 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 NUMA
+ 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 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
+ depends on $(cc-option,-mindirect-branch=thunk)
+ 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.
+
+config EXPOLINE_EXTERN
+ def_bool n
+ depends on EXPOLINE
+ depends on CC_IS_GCC && GCC_VERSION >= 110200
+ depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
+ prompt "Generate expolines as extern functions."
+ help
+ This option is required for some tooling like kpatch. The kernel is
+ compiled with -mindirect-branch=thunk-extern and requires a newer
+ compiler.
+
+ 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
+ def_bool 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.
+ Note: this option exists only for documentation purposes, please do
+ not remove it.
+
+config RANDOMIZE_BASE
+ bool "Randomize the address of the kernel image (KASLR)"
+ 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 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 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.
+
+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 "512"
+ 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 && 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"
+ 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
+
+config S390_MODULES_SANITY_TEST_HELPERS
+ def_bool n
+
+menu "Selftests"
+
+config S390_UNWIND_SELFTEST
+ def_tristate n
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ 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.
+
+config S390_KPROBES_SANITY_TEST
+ def_tristate n
+ prompt "Enable s390 specific kprobes tests"
+ depends on KPROBES
+ depends on KUNIT
+ help
+ This option enables an s390 specific kprobes test 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.
+
+config S390_MODULES_SANITY_TEST
+ def_tristate n
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ prompt "Enable s390 specific modules tests"
+ select S390_MODULES_SANITY_TEST_HELPERS
+ help
+ This option enables an s390 specific modules test. 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