From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 44DCB5C96 for ; Fri, 7 Feb 2025 00:30:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738888214; cv=none; b=mAYnNLxa2tmyvaSm1+eWeoVBteexTgNhldFNQ9mwYqhcFbHprZ+ehFs6ibHXaCwf8/97tLUOx/Vodb5PHceCYM5EsKDe2HuzE1vh7o2Q5l2e3iPl8/HqX5LfNro05HOYrMJZVuwllJ9fWjj0p8zebHj8ewY0x7HVanV7CtswnJU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738888214; c=relaxed/simple; bh=8abTLcNSfJoRZSgiemv0tQuW9WOOaennaLhXaHwgefc=; h=Date:To:From:Subject:Message-Id; b=P9Ph3qK6Lpju2NMYqmNOuVfjGyB8nQVqts/uSHwBylZoOr1UOzadwl9NY0K7s41omgjMw5FnqElhFdNesSv9pWhe4plKLQUI5shwwiR2Iorxx4VyrtnzkKvrMDD+13GqqE0iJmU7HNJNszlWI5LL3p8APaPK6Lofj3X/kh86RII= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=UwzBxCDD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="UwzBxCDD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B75EC4CEDD; Fri, 7 Feb 2025 00:30:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1738888213; bh=8abTLcNSfJoRZSgiemv0tQuW9WOOaennaLhXaHwgefc=; h=Date:To:From:Subject:From; b=UwzBxCDDd+HRoMVYhTzvKAO9US9TC+/CEUYRA4gkHzDiheZtOVgETTIfXATUPRvpl CiJg4vvdvnwFlL/hDGp8NsCD2/YWvHeTww8BgQcHwKXF9RfrN1DuLDNQTRcKXfPqx5 9p9RF5Fc50wEQ3cayPt0ILGoEpoIjE9JjJljk4dI= Date: Thu, 06 Feb 2025 16:30:13 -0800 To: mm-commits@vger.kernel.org,will@kernel.org,usama.arif@bytedance.com,thomas.lendacky@amd.com,tglx@linutronix.de,skinsburskii@linux.microsoft.com,saravanak@google.com,rppt@kernel.org,rostedt@goodmis.org,robh@kernel.org,robh+dt@kernel.org,ptyadav@amazon.de,peterz@infradead.org,pbonzini@redhat.com,pasha.tatashin@soleen.com,mingo@redhat.com,mark.rutland@arm.com,luto@kernel.org,krzk@kernel.org,jgowans@amazon.com,hpa@zytor.com,ebiederm@xmission.com,dwmw2@infradead.org,dave.hansen@linux.intel.com,corbet@lwn.net,catalin.marinas@arm.com,bp@alien8.de,benh@kernel.crashing.org,ashish.kalra@amd.com,arnd@arndb.de,anthony.yznaga@oracle.com,graf@amazon.com,akpm@linux-foundation.org From: Andrew Morton Subject: + kexec-add-config-option-for-kho.patch added to mm-nonmm-unstable branch Message-Id: <20250207003013.9B75EC4CEDD@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: kexec: add config option for KHO has been added to the -mm mm-nonmm-unstable branch. Its filename is kexec-add-config-option-for-kho.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kexec-add-config-option-for-kho.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Alexander Graf Subject: kexec: add config option for KHO Date: Thu, 6 Feb 2025 15:27:48 +0200 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. Link: https://lkml.kernel.org/r/20250206132754.2596694-9-rppt@kernel.org Signed-off-by: Alexander Graf Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Cc: Andy Lutomirski Cc: Anthony Yznaga Cc: Arnd Bergmann Cc: Ashish Kalra Cc: Ben Herrenschmidt Cc: Borislav Betkov Cc: Catalin Marinas Cc: Dave Hansen Cc: David Woodhouse Cc: Eric Biederman Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: James Gowans Cc: Jonathan Corbet Cc: Krzysztof Kozlowski Cc: Mark Rutland Cc: Paolo Bonzini Cc: Pasha Tatashin Cc: Peter Zijlstra (Intel) Cc: Pratyush Yadav Cc: Rob Herring Cc: Rob Herring Cc: Saravana Kannan Cc: Stanislav Kinsburskii Cc: Steven Rostedt (VMware) Cc: Thomas Gleixner Cc: Tom Lendacky Cc: Usama Arif Cc: Will Deacon Signed-off-by: Andrew Morton --- kernel/Kconfig.kexec | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/kernel/Kconfig.kexec~kexec-add-config-option-for-kho +++ a/kernel/Kconfig.kexec @@ -95,6 +95,19 @@ config KEXEC_JUMP Jump between original kernel and kexeced kernel and invoke code in physical address mode via KEXEC +config KEXEC_HANDOVER + bool "kexec handover" + depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE + select MEMBLOCK_KHO_SCRATCH + select KEXEC_FILE + 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" default ARCH_DEFAULT_CRASH_DUMP _ Patches currently in -mm which might be from graf@amazon.com are memblock-add-support-for-scratch-memory.patch kexec-add-kexec-handover-kho-generation-helpers.patch kexec-add-kho-parsing-support.patch kexec-add-kho-support-to-kexec-file-loads.patch kexec-add-config-option-for-kho.patch kexec-add-documentation-for-kho.patch arm64-add-kho-support.patch x86-add-kho-support.patch memblock-add-kho-support-for-reserve_mem.patch