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This patch is a minor cleanup to the series "refactor Kconfig to consolidate KEXEC and CRASH options". In that series, a new option ARCH_DEFAULT_KEXEC was introduced in order to obtain the equivalent behavior of s390 original Kconfig settings for KEXEC. As it turns out, this new option did not fully provide the equivalent behavior, rather a "select KEXEC" did. As such, the ARCH_DEFAULT_KEXEC is not needed anymore, so remove it. Link: https://lkml.kernel.org/r/20230802161750.2215-1-eric.devolder@oracle.com Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
116 lines
3.6 KiB
Plaintext
116 lines
3.6 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "Kexec and crash features"
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config CRASH_CORE
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bool
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config KEXEC_CORE
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select CRASH_CORE
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bool
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config KEXEC_ELF
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bool
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config HAVE_IMA_KEXEC
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bool
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config KEXEC
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bool "Enable kexec system call"
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depends on ARCH_SUPPORTS_KEXEC
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select KEXEC_CORE
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but it is independent of the system firmware. And like a reboot
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you can start any kernel with it, not just Linux.
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The name comes from the similarity to the exec system call.
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It is an ongoing process to be certain the hardware in a machine
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is properly shutdown, so do not be surprised if this code does not
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initially work for you. As of this writing the exact hardware
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interface is strongly in flux, so no good recommendation can be
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made.
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config KEXEC_FILE
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bool "Enable kexec file based system call"
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depends on ARCH_SUPPORTS_KEXEC_FILE
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select KEXEC_CORE
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help
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This is new version of kexec system call. This system call is
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file based and takes file descriptors as system call argument
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for kernel and initramfs as opposed to list of segments as
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accepted by kexec system call.
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config KEXEC_SIG
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bool "Verify kernel signature during kexec_file_load() syscall"
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depends on ARCH_SUPPORTS_KEXEC_SIG
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depends on KEXEC_FILE
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help
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This option makes the kexec_file_load() syscall check for a valid
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signature of the kernel image. The image can still be loaded without
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a valid signature unless you also enable KEXEC_SIG_FORCE, though if
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there's a signature that we can check, then it must be valid.
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In addition to this option, you need to enable signature
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verification for the corresponding kernel image type being
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loaded in order for this to work.
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config KEXEC_SIG_FORCE
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bool "Require a valid signature in kexec_file_load() syscall"
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depends on ARCH_SUPPORTS_KEXEC_SIG_FORCE
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depends on KEXEC_SIG
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help
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This option makes kernel signature verification mandatory for
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the kexec_file_load() syscall.
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config KEXEC_IMAGE_VERIFY_SIG
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bool "Enable Image signature verification support (ARM)"
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default ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG
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depends on ARCH_SUPPORTS_KEXEC_IMAGE_VERIFY_SIG
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depends on KEXEC_SIG
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depends on EFI && SIGNED_PE_FILE_VERIFICATION
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help
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Enable Image signature verification support.
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config KEXEC_BZIMAGE_VERIFY_SIG
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bool "Enable bzImage signature verification support"
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depends on ARCH_SUPPORTS_KEXEC_BZIMAGE_VERIFY_SIG
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depends on KEXEC_SIG
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depends on SIGNED_PE_FILE_VERIFICATION
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select SYSTEM_TRUSTED_KEYRING
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help
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Enable bzImage signature verification support.
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config KEXEC_JUMP
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bool "kexec jump"
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depends on ARCH_SUPPORTS_KEXEC_JUMP
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depends on KEXEC && HIBERNATION
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help
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Jump between original kernel and kexeced kernel and invoke
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code in physical address mode via KEXEC
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config CRASH_DUMP
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bool "kernel crash dumps"
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depends on ARCH_SUPPORTS_CRASH_DUMP
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depends on ARCH_SUPPORTS_KEXEC
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select CRASH_CORE
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select KEXEC_CORE
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select KEXEC
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help
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Generate crash dump after being started by kexec.
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This should be normally only set in special crash dump kernels
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which are loaded in the main kernel with kexec-tools into
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a specially reserved region and then later executed after
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a crash by kdump/kexec. The crash dump kernel must be compiled
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to a memory address not used by the main kernel or BIOS using
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PHYSICAL_START, or it must be built as a relocatable image
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(CONFIG_RELOCATABLE=y).
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For more details see Documentation/admin-guide/kdump/kdump.rst
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For s390, this option also enables zfcpdump.
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See also <file:Documentation/s390/zfcpdump.rst>
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endmenu
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