On 2023/6/13 1:27, Eric DeVolder wrote: > The config options for kexec and crash features are consolidated > into new file kernel/Kconfig.kexec. Under the "General Setup" submenu > is a new submenu "Kexec and crash handling" where all the kexec and > crash options that were once in the arch-dependent submenu "Processor > type and features" are now consolidated. > > The following options are impacted: > > - KEXEC > - KEXEC_FILE > - KEXEC_SIG > - KEXEC_SIG_FORCE > - KEXEC_BZIMAGE_VERIFY_SIG > - KEXEC_JUMP > - CRASH_DUMP > > The three main options are KEXEC, KEXEC_FILE and CRASH_DUMP. > > Architectures specify support of certain KEXEC and CRASH features with > similarly named new ARCH_HAS_<option> config options. > > Architectures can utilize the new ARCH_SUPPORTS_<option> config > options to specify additional components when <option> is enabled. > > To summarize, the ARCH_HAS_<option> permits the <option> to be > enabled, and the ARCH_SUPPORTS_<option> handles side effects (ie. > select statements). > > Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx> > --- > arch/Kconfig | 13 ------ > init/Kconfig | 2 + > kernel/Kconfig.kexec | 103 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 105 insertions(+), 13 deletions(-) > create mode 100644 kernel/Kconfig.kexec > > diff --git a/arch/Kconfig b/arch/Kconfig > index 205fd23e0cad..a37730679730 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -11,19 +11,6 @@ source "arch/$(SRCARCH)/Kconfig" > > menu "General architecture-dependent options" > > -config CRASH_CORE > - bool > - > -config KEXEC_CORE > - select CRASH_CORE > - bool > - > -config KEXEC_ELF > - bool > - > -config HAVE_IMA_KEXEC > - bool > - > config ARCH_HAS_SUBPAGE_FAULTS > bool > help > diff --git a/init/Kconfig b/init/Kconfig > index 32c24950c4ce..4424447e23a5 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1917,6 +1917,8 @@ config BINDGEN_VERSION_TEXT > config TRACEPOINTS > bool > > +source "kernel/Kconfig.kexec" > + > endmenu # General setup > > source "arch/Kconfig" > diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec > new file mode 100644 > index 000000000000..660048099865 > --- /dev/null > +++ b/kernel/Kconfig.kexec > @@ -0,0 +1,103 @@ > +# SPDX-License-Identifier: GPL-2.0-only > + > +menu "Kexec and crash features" > + > +config CRASH_CORE > + bool > + > +config KEXEC_CORE > + select CRASH_CORE > + bool > + > +config KEXEC_ELF > + bool > + > +config HAVE_IMA_KEXEC > + bool > + > +config KEXEC > + bool "Enable kexec system call" > + default ARCH_DEFAULT_KEXEC > + depends on ARCH_HAS_KEXEC > + select KEXEC_CORE > + help > + kexec is a system call that implements the ability to shutdown your > + current kernel, and to start another kernel. It is like a reboot > + but it is independent of the system firmware. And like a reboot > + you can start any kernel with it, not just Linux. "kernel. It is like", "firmware. And like" A few more spaces, I don't know the original author's intention, perhaps can be removed. > + > + The name comes from the similarity to the exec system call. > + > + It is an ongoing process to be certain the hardware in a machine > + is properly shutdown, so do not be surprised if this code does not > + initially work for you. As of this writing the exact hardware > + interface is strongly in flux, so no good recommendation can be > + made. > + > +config KEXEC_FILE > + bool "Enable kexec file based system call" > + depends on ARCH_HAS_KEXEC_FILE > + select KEXEC_CORE > + help > + This is new version of kexec system call. This system call is > + file based and takes file descriptors as system call argument > + for kernel and initramfs as opposed to list of segments as > + accepted by previous system call. > + > +config KEXEC_SIG > + bool "Verify kernel signature during kexec_file_load() syscall" > + depends on KEXEC_FILE && MODULE_SIG_FORMAT I see that there is no "depends on MODULE_SIG_FORMAT" on x86 and arm64. > + help > + This blank line can be deleted. > + This option makes the kexec_file_load() syscall check for a valid > + signature of the kernel image. The image can still be loaded without > + a valid signature unless you also enable KEXEC_SIG_FORCE, though if > + there's a signature that we can check, then it must be valid. > + > + In addition to this option, you need to enable signature > + verification for the corresponding kernel image type being > + loaded in order for this to work. > + > +config KEXEC_SIG_FORCE > + bool "Require a valid signature in kexec_file_load() syscall" > + depends on KEXEC_SIG > + help > + This option makes kernel signature verification mandatory for > + the kexec_file_load() syscall. > + > +config KEXEC_BZIMAGE_VERIFY_SIG > + bool "Enable bzImage signature verification support" > + depends on KEXEC_SIG > + depends on SIGNED_PE_FILE_VERIFICATION > + select SYSTEM_TRUSTED_KEYRING > + help > + Enable bzImage signature verification support. > + > +config KEXEC_JUMP > + bool "kexec jump" > + depends on KEXEC && HIBERNATION > + depends on ARCH_HAS_KEXEC_JUMP > + help > + Jump between original kernel and kexeced kernel and invoke > + code in physical address mode via KEXEC > + > +config CRASH_DUMP > + bool "kernel crash dumps" > + depends on ARCH_HAS_CRASH_DUMP > + select KEXEC_CORE > + select CRASH_CORE > + help > + Generate crash dump after being started by kexec. > + This should be normally only set in special crash dump kernels > + which are loaded in the main kernel with kexec-tools into > + a specially reserved region and then later executed after > + a crash by kdump/kexec. The crash dump kernel must be compiled > + to a memory address not used by the main kernel or BIOS using > + PHYSICAL_START, or it must be built as a relocatable image > + (CONFIG_RELOCATABLE=y). > + For more details see Documentation/admin-guide/kdump/kdump.rst > + > + For s390, this option also enables zfcpdump. > + See also <file:Documentation/s390/zfcpdump.rst> > + > +endmenu > -- Regards, Zhen Lei
