[PATCH v2] crash, powerpc: Default to CRASH_DUMP=n on PPC_BOOK3S_32

[Dave Vasilevsky]

On 2024-09-17 12:37, Dave Vasilevsky wrote:
> Fixes boot failures on 6.9 on PPC_BOOK3S_32 machines using
> Open Firmware. On these machines, the kernel refuses to boot
> from non-zero PHYSICAL_START, which occurs when CRASH_DUMP is on.

Hi Eric, and other kexec people,

Is there anywhere else I should be sending this patch to request a merge? I don't see a kexec tree anywhere.

Thanks,
Dave
 
> Since most PPC_BOOK3S_32 machines boot via Open Firmware, it should
> default to off for them. Users booting via some other mechanism
> can still turn it on explicitly.
> 
> Does not change the default on any other architectures for the
> time being.
> 
> Signed-off-by: Dave Vasilevsky <dave at vasilevsky.ca>
> Reported-by: Reimar Döffinger <Reimar.Doeffinger at gmx.de>
> Closes: https://lists.debian.org/debian-powerpc/2024/07/msg00001.html
> Fixes: 75bc255a7444 ("crash: clean up kdump related config items")
> ---
>  arch/arm/Kconfig       | 3 +++
>  arch/arm64/Kconfig     | 3 +++
>  arch/loongarch/Kconfig | 3 +++
>  arch/mips/Kconfig      | 3 +++
>  arch/powerpc/Kconfig   | 4 ++++
>  arch/riscv/Kconfig     | 3 +++
>  arch/s390/Kconfig      | 3 +++
>  arch/sh/Kconfig        | 3 +++
>  arch/x86/Kconfig       | 3 +++
>  kernel/Kconfig.kexec   | 2 +-
>  10 files changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 0ec034933cae..4cc31467298b 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1598,6 +1598,9 @@ config ATAGS_PROC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config AUTO_ZRELADDR
>  	bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
>  	default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index ed15b876fa74..8c67b76347d3 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1559,6 +1559,9 @@ config ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
>  	def_bool CRASH_RESERVE
>  
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 0e3abf7b0bd3..7ba3baee859e 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -600,6 +600,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SELECTS_CRASH_DUMP
>  	def_bool y
>  	depends on CRASH_DUMP
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 60077e576935..b547f4304d0c 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -2881,6 +2881,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config PHYSICAL_START
>  	hex "Physical address where the kernel is loaded"
>  	default "0xffffffff84000000"
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 8a4ee57cd4ef..c04f7bb543cc 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -682,6 +682,10 @@ config RELOCATABLE_TEST
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	bool
> +	default y if !PPC_BOOK3S_32
> +
>  config ARCH_SELECTS_CRASH_DUMP
>  	def_bool y
>  	depends on CRASH_DUMP
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 86d1f1cea571..341ef759870a 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -882,6 +882,9 @@ config ARCH_SUPPORTS_KEXEC_PURGATORY
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
>  	def_bool CRASH_RESERVE
>  
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index c60e699e99f5..fff371b89e41 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -275,6 +275,9 @@ config ARCH_SUPPORTS_CRASH_DUMP
>  	  This option also enables s390 zfcpdump.
>  	  See also <file:Documentation/arch/s390/zfcpdump.rst>
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  menu "Processor type and features"
>  
>  config HAVE_MARCH_Z10_FEATURES
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index e9103998cca9..04ff5fb9242e 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -550,6 +550,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool BROKEN_ON_SMP
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SUPPORTS_KEXEC_JUMP
>  	def_bool y
>  
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index d1fe732979d4..7f39db779574 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2092,6 +2092,9 @@ config ARCH_SUPPORTS_KEXEC_JUMP
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool X86_64 || (X86_32 && HIGHMEM)
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SUPPORTS_CRASH_HOTPLUG
>  	def_bool y
>  
> diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
> index 6c34e63c88ff..4d111f871951 100644
> --- a/kernel/Kconfig.kexec
> +++ b/kernel/Kconfig.kexec
> @@ -97,7 +97,7 @@ config KEXEC_JUMP
>  
>  config CRASH_DUMP
>  	bool "kernel crash dumps"
> -	default y
> +	default ARCH_DEFAULT_CRASH_DUMP
>  	depends on ARCH_SUPPORTS_CRASH_DUMP
>  	depends on KEXEC_CORE
>  	select VMCORE_INFO