Re: [PATCH linux-next v3 05/14] crash: clean up kdump related config items

Baoquan He
2024-08-23T01:59:08Z

On 08/22/24 at 08:41pm, Dave Vasilevsky wrote:
> On 2024-08-22 20:04, Baoquan He wrote:
> > If so, below patch possiblly can fix it. Can you help check if it's OK?
>
> That removes the possibility of enabling CRASH_DUMP on PPC_BOOK3S_32, even when booting via other mechanisms. Maybe it would be best to just make it not-default? Please take a look at this patch:
>

This is a good mimic of ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG and the
correspondent KEXEC_IMAGE_VERIFY_SIG. It looks good to me, as long as no
one complain we introduce too many knobs.

Can you post this formally so that people can review it?

>
> From d6e5fe3a45f46f1aa01914648c443291d956de9e Mon Sep 17 00:00:00 2001
> From: Dave Vasilevsky <dave@vasilevsky.ca>
> Date: Thu, 22 Aug 2024 20:13:46 -0400
> Subject: [PATCH] powerpc: Default to CRASH_DUMP=n when Open Firmware boot is
> likely
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
>
> Open Firmware is unable to boot a kernel where PHYSICAL_START is
> non-zero, which occurs when CRASH_DUMP is on.
>
> On PPC_BOOK3S_32, the most common way of booting is Open Firmware, so
> most users probably don't want CRASH_DUMP. Users booting via some
> other mechanism can turn it on explicitly.
>
> Signed-off-by: Dave Vasilevsky <dave@vasilevsky.ca>
> Reported-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
> Fixes: 75bc255a7444
> ---
> 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 54b2bb817a7f..200995052690 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1597,6 +1597,9 @@ 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 a2f8ff354ca6..43e08cc8204f 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1558,6 +1558,9 @@ 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 70f169210b52..ce232ddcd27d 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -599,6 +599,9 @@ 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 d7b09b064a8a..0f3c1f958eac 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 0f3cd7c3a436..eb247b5ee569 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -880,6 +880,9 @@ 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 a822f952f64a..05a1fb408471 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 1aa3c4a0c5b2..3a6338962636 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -549,6 +549,9 @@ 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 007bab9f2a0e..aa4666bb9e9c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2087,6 +2087,9 @@ 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
> --
> 2.34.1
>