linux-kernel - [PATCH v3 06/17] kexec: Add config option for KHO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240117144704.602-7-graf@amazon.com>
Date: Wed, 17 Jan 2024 14:46:53 +0000
From: Alexander Graf <graf@...zon.com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-trace-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<kexec@...ts.infradead.org>, <linux-doc@...r.kernel.org>, <x86@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>, "H . Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>, Andrew Morton
	<akpm@...ux-foundation.org>, Mark Rutland <mark.rutland@....com>, "Tom
 Lendacky" <thomas.lendacky@....com>, Ashish Kalra <ashish.kalra@....com>,
	James Gowans <jgowans@...zon.com>, Stanislav Kinsburskii
	<skinsburskii@...ux.microsoft.com>, <arnd@...db.de>, <pbonzini@...hat.com>,
	<madvenka@...ux.microsoft.com>, Anthony Yznaga <anthony.yznaga@...cle.com>,
	Usama Arif <usama.arif@...edance.com>, David Woodhouse <dwmw@...zon.co.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>, Rob Herring
	<robh+dt@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH v3 06/17] kexec: Add config option for KHO

We have all generic code in place now to support Kexec with KHO. This
patch adds a config option that depends on architecture support to
enable KHO support.

Signed-off-by: Alexander Graf <graf@...zon.com>
---
 kernel/Kconfig.kexec | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 946dffa048b7..6fb5a6ae9697 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -93,6 +93,19 @@ config KEXEC_JUMP
 	  Jump between original kernel and kexeced kernel and invoke
 	  code in physical address mode via KEXEC
 
+config KEXEC_KHO
+	bool "kexec handover"
+	depends on ARCH_SUPPORTS_KEXEC_KHO
+	depends on KEXEC
+	select MEMBLOCK_SCRATCH
+	select LIBFDT
+	select CMA
+	help
+	  Allow kexec to hand over state across kernels by generating and
+	  passing additional metadata to the target kernel. This is useful
+	  to keep data or state alive across the kexec. For this to work,
+	  both source and target kernels need to have this option enabled.
+
 config CRASH_DUMP
 	bool "kernel crash dumps"
 	depends on ARCH_SUPPORTS_CRASH_DUMP
-- 
2.40.1




Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879