Re: [PATCH v3 11/13] riscv/kexec: refactor for kernel/Kconfig.kexec

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On 6/28/23 03:20, Conor Dooley wrote:
Hey Eric,

On Mon, Jun 26, 2023 at 12:13:30PM -0400, Eric DeVolder wrote:
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.

I find this diff a little hard to follow (since the other half off the
change is in another patch), so it may be me missing something, but are
you sure?


Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>
---
  arch/riscv/Kconfig | 48 ++++++++++++++--------------------------------
  1 file changed, 14 insertions(+), 34 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5966ad97c30c..c484abd9bbfd 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -585,48 +585,28 @@ config RISCV_BOOT_SPINWAIT
If unsure what to do here, say N. -config KEXEC
-	bool "Kexec system call"
-	depends on MMU
+config ARCH_SUPPORTS_KEXEC
+	def_bool MMU
+
+config ARCH_SELECTS_KEXEC
+	def_bool y
+	depends on KEXEC
  	select HOTPLUG_CPU if SMP
-	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.
- The name comes from the similarity to the exec system call.
+config ARCH_SUPPORTS_KEXEC_FILE
+	def_bool 64BIT && MMU && CRYPTO=y && CRYPTO_SHA256=y

This looks like a change to me. Previously, only KEXEC_PURGATORY
required these crypto options to be like so, but now KEXEC_FILE needs
them too.

What am I missing?
Conor,
Thanks for looking at this! Indeed I erroneously applied the CRYPTO=y && CRYPTO_SHA256=y
to KEXEC_FILE rather than PURGATORY. I will correct for v4!
Thanks!
eric


Cheers,
Conor.

-config KEXEC_FILE
-	bool "kexec file based systmem call"
-	depends on 64BIT && MMU
-	select HAVE_IMA_KEXEC if IMA
-	select KEXEC_CORE
+config ARCH_SELECTS_KEXEC_FILE
+	def_bool y
+	depends on KEXEC_FILE
  	select KEXEC_ELF
-	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.
-
-	  If you don't know what to do here, say Y.
+	select HAVE_IMA_KEXEC if IMA
config ARCH_HAS_KEXEC_PURGATORY
  	def_bool KEXEC_FILE
-	depends on CRYPTO=y
-	depends on CRYPTO_SHA256=y
-config CRASH_DUMP
-	bool "Build kdump crash kernel"
-	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.
-
-	  For more details see Documentation/admin-guide/kdump/kdump.rst
+config ARCH_SUPPORTS_CRASH_DUMP
+	def_bool y
config COMPAT
  	bool "Kernel support for 32-bit U-mode"
--
2.31.1




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