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Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 958 |
1 files changed, 958 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig new file mode 100644 index 000000000..878993982 --- /dev/null +++ b/arch/s390/Kconfig @@ -0,0 +1,958 @@ +# 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 |