The patch titled
Subject: s390/kexec: refactor for kernel/Kconfig.kexec
has been added to the -mm mm-nonmm-unstable branch. Its filename is
s390-kexec-refactor-for-kernel-kconfigkexec.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/s390-kexec-refactor-for-kernel-kconfigkexec.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Eric DeVolder <eric.devolder@xxxxxxxxxx>
Subject: s390/kexec: refactor for kernel/Kconfig.kexec
Date: Thu, 6 Jul 2023 18:20:26 -0400
The kexec and crash kernel options are provided in the common
kernel/Kconfig.kexec. Utilize the common options and provide the
ARCH_SUPPORTS_ and ARCH_SELECTS_ entries to recreate the equivalent set of
KEXEC and CRASH options.
NOTE: The original Kconfig has a KEXEC_SIG which depends on
MODULE_SIG_FORMAT. However, attempts to keep the MODULE_SIG_FORMAT
dependency (using the strategy outlined in this series, and other
techniques) results in 'error: recursive dependency detected' on CRYPTO.
Per Alexander Gordeev <agordeev@xxxxxxxxxxxxx>: "the MODULE_SIG_FORMAT
dependency was introduced with [git commit below] and in fact was not
necessary, since s390 did/does not use mod_check_sig() anyway.
commit c8424e776b09 ("MODSIGN: Export module signature definitions")
MODULE_SIG_FORMAT is needed to select SYSTEM_DATA_VERIFICATION. But
SYSTEM_DATA_VERIFICATION is also selected by FS_VERITY*, so dropping
MODULE_SIG_FORMAT does not hurt."
Therefore, the solution is to drop the MODULE_SIG_FORMAT dependency from
KEXEC_SIG. Still results in equivalent .config files for s390.
Link: https://lkml.kernel.org/r/20230706222027.189117-13-eric.devolder@xxxxxxxxxx
Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>
Acked-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/Kconfig | 69 ++++++++++++++------------------------------
1 file changed, 23 insertions(+), 46 deletions(-)
--- a/arch/s390/Kconfig~s390-kexec-refactor-for-kernel-kconfigkexec
+++ a/arch/s390/Kconfig
@@ -214,6 +214,7 @@ config S390
select HAVE_VIRT_CPU_ACCOUNTING_IDLE
select IOMMU_HELPER if PCI
select IOMMU_SUPPORT if PCI
+ select KEXEC
select MMU_GATHER_MERGE_VMAS
select MMU_GATHER_NO_GATHER
select MMU_GATHER_RCU_TABLE_FREE
@@ -245,6 +246,28 @@ config PGTABLE_LEVELS
source "kernel/livepatch/Kconfig"
+config ARCH_DEFAULT_KEXEC
+ def_bool y
+
+config ARCH_SUPPORTS_KEXEC
+ def_bool y
+
+config ARCH_SUPPORTS_KEXEC_FILE
+ def_bool CRYPTO && CRYPTO_SHA256 && CRYPTO_SHA256_S390
+
+config ARCH_SUPPORTS_KEXEC_SIG
+ def_bool y
+
+config ARCH_HAS_KEXEC_PURGATORY
+ def_bool KEXEC_FILE
+
+config ARCH_SUPPORTS_CRASH_DUMP
+ def_bool y
+ help
+ 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>
+
menu "Processor type and features"
config HAVE_MARCH_Z10_FEATURES
@@ -483,36 +506,6 @@ config SCHED_TOPOLOGY
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"
@@ -734,22 +727,6 @@ config 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
_
Patches currently in -mm which might be from eric.devolder@xxxxxxxxxx are
kexec-consolidate-kexec-and-crash-options-into-kernel-kconfigkexec.patch
x86-kexec-refactor-for-kernel-kconfigkexec.patch
arm-kexec-refactor-for-kernel-kconfigkexec.patch
ia64-kexec-refactor-for-kernel-kconfigkexec.patch
arm64-kexec-refactor-for-kernel-kconfigkexec.patch
loongarch-kexec-refactor-for-kernel-kconfigkexec.patch
m68k-kexec-refactor-for-kernel-kconfigkexec.patch
mips-kexec-refactor-for-kernel-kconfigkexec.patch
parisc-kexec-refactor-for-kernel-kconfigkexec.patch
powerpc-kexec-refactor-for-kernel-kconfigkexec.patch
riscv-kexec-refactor-for-kernel-kconfigkexec.patch
s390-kexec-refactor-for-kernel-kconfigkexec.patch
sh-kexec-refactor-for-kernel-kconfigkexec.patch
