select HAVE_ARCH_SOFT_DIRTY
select MODULES_USE_ELF_RELA
select X86_DEV_DMA_OPS
+ select ARCH_HAS_SYSCALL_WRAPPER
#
# Arch settings
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV if X86_64
- select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_PMEM_API if X86_64
select ARCH_HAS_REFCOUNT
select CLOCKSOURCE_VALIDATE_LAST_CYCLE
select CLOCKSOURCE_WATCHDOG
select DCACHE_WORD_ACCESS
+ select DMA_DIRECT_OPS
select EDAC_ATOMIC_SCRUB
select EDAC_SUPPORT
select GENERIC_CLOCKEVENTS
If in doubt, say Y.
-config X86_FAST_FEATURE_TESTS
- bool "Fast CPU feature tests" if EMBEDDED
- default y
- ---help---
- Some fast-paths in the kernel depend on the capabilities of the CPU.
- Say Y here for the kernel to patch in the appropriate code at runtime
- based on the capabilities of the CPU. The infrastructure for patching
- code at runtime takes up some additional space; space-constrained
- embedded systems may wish to say N here to produce smaller, slightly
- slower code.
-
config X86_X2APIC
bool "Support x2apic"
depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
config STA2X11
bool "STA2X11 Companion Chip Support"
depends on X86_32_NON_STANDARD && PCI
+ select ARCH_HAS_PHYS_TO_DMA
select X86_DEV_DMA_OPS
select X86_DMA_REMAP
select SWIOTLB
config X86_5LEVEL
bool "Enable 5-level page tables support"
+ select DYNAMIC_MEMORY_LAYOUT
+ select SPARSEMEM_VMEMMAP
depends on X86_64
---help---
5-level paging enables access to larger address space:
It will be supported by future Intel CPUs.
- Note: a kernel with this option enabled can only be booted
- on machines that support the feature.
+ A kernel with the option enabled can be booted on machines that
+ support 4- or 5-level paging.
See Documentation/x86/x86_64/5level-paging.txt for more
information.
def_bool y
depends on X86_32 && DISCONTIGMEM
-config NEED_NODE_MEMMAP_SIZE
- def_bool y
- depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
-
config ARCH_FLATMEM_ENABLE
def_bool y
depends on X86_32 && !NUMA
Don't change this unless you know what you are doing.
+config DYNAMIC_MEMORY_LAYOUT
+ bool
+ ---help---
+ This option makes base addresses of vmalloc and vmemmap as well as
+ __PAGE_OFFSET movable during boot.
+
config RANDOMIZE_MEMORY
bool "Randomize the kernel memory sections"
depends on X86_64
depends on RANDOMIZE_BASE
+ select DYNAMIC_MEMORY_LAYOUT
default RANDOMIZE_BASE
---help---
Randomizes the base virtual address of kernel memory sections
it can be used to assist security vulnerability exploitation.
This setting can be changed at boot time via the kernel command
- line parameter vsyscall=[native|emulate|none].
+ line parameter vsyscall=[emulate|none].
On a system with recent enough glibc (2.14 or newer) and no
static binaries, you can say None without a performance penalty
If unsure, select "Emulate".
- config LEGACY_VSYSCALL_NATIVE
- bool "Native"
- help
- Actual executable code is located in the fixed vsyscall
- address mapping, implementing time() efficiently. Since
- this makes the mapping executable, it can be used during
- security vulnerability exploitation (traditionally as
- ROP gadgets). This configuration is not recommended.
-
config LEGACY_VSYSCALL_EMULATE
bool "Emulate"
help
depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
config PCI_MMCONFIG
- def_bool y
- depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
+ bool "Support mmconfig PCI config space access" if X86_64
+ default y
+ depends on PCI && (ACPI || SFI || JAILHOUSE_GUEST)
+ depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
config PCI_OLPC
def_bool y
def_bool y
depends on PCI
-config PCI_MMCONFIG
- bool "Support mmconfig PCI config space access"
- depends on X86_64 && PCI && ACPI
+config MMCONF_FAM10H
+ def_bool y
+ depends on X86_64 && PCI_MMCONFIG && ACPI
config PCI_CNB20LE_QUIRK
bool "Read CNB20LE Host Bridge Windows" if EXPERT