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 8BCB3537E9 for ; Sat, 10 May 2025 00:37:24 +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=1746837444; cv=none; b=C0BpdrAzjpeSrBSrxi65Xy3gFB+maDJPmzEuMA+K4D4KfK6q65KcTwt4CJEgpc4M2ilv0VFr2/2z4fYKoZvjIqK5GDB/MvrDIArlU2HCVpkXh6ehufp/9v3fEbBEqphgi2qC89m+3Yj/F3rDdN/AMXaMuEE1G7oUshPBuSKlvPk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746837444; c=relaxed/simple; bh=gbVxmXMHrZfeZtaXbsSuD1tRmZQ3VGby9l15hgI6X0I=; h=Date:To:From:Subject:Message-Id; b=j4FWkqgyvzVvPVfRb3LhgXBQTeONKsRtjqBl8elRHsSLDtFidfjnZlrZRtJP6bdU4W684Vttv54jj2nvoD8eHIGOrm0aAeUblj5sIiW8zZ1QvtCFfFD9nZiBW+WuwEJg+f9IZ6HsPkIKk95tyV5nzmpOHHRHaJSAHgUcZGEw2+g= 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=z43mt51U; 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="z43mt51U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBBA5C4CEE4; Sat, 10 May 2025 00:37:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1746837443; bh=gbVxmXMHrZfeZtaXbsSuD1tRmZQ3VGby9l15hgI6X0I=; h=Date:To:From:Subject:From; b=z43mt51U8L4EMxTozO3x1KYWfctqCQkNjVp/kd3uwNVkVJ/r3FaWa/JFCB6Zv3EWT qdpoLx/ugWjtYpgYhhsMgKPapCmB28nnk97rVBb5mViVu9sy5n+LfssZnbvEabinnu tRiqnce3beDUDtb2HihwFbfFsbB2XCg6aHVd6jLI= Date: Fri, 09 May 2025 17:37:23 -0700 To: mm-commits@vger.kernel.org,will@kernel.org,thomas.lendacky@amd.com,tglx@linutronix.de,skinsburskii@linux.microsoft.com,saravanak@google.com,rppt@kernel.org,rostedt@goodmis.org,robh@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,jgg@nvidia.com,hpa@zytor.com,ebiederm@xmission.com,dwmw2@infradead.org,dave.hansen@linux.intel.com,corbet@lwn.net,changyuanl@google.com,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-unstable branch Message-Id: <20250510003723.CBBA5C4CEE4@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-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-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: Fri, 9 May 2025 00:46:26 -0700 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/20250509074635.3187114-9-changyuanl@google.com Signed-off-by: Alexander Graf Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) Signed-off-by: Changyuan Lyu 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: Jason Gunthorpe Cc: Jonathan Corbet Cc: Krzysztof Kozlowski Cc: Marc Rutland Cc: Paolo Bonzini Cc: Pasha Tatashin Cc: Peter Zijlstra Cc: Pratyush Yadav Cc: Rob Herring Cc: Saravana Kannan Cc: Stanislav Kinsburskii Cc: Steven Rostedt Cc: Thomas Gleinxer Cc: Thomas Lendacky Cc: Will Deacon Signed-off-by: Andrew Morton --- kernel/Kconfig.kexec | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- a/kernel/Kconfig.kexec~kexec-add-config-option-for-kho +++ a/kernel/Kconfig.kexec @@ -95,6 +95,20 @@ 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 DEBUG_FS + 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 arm64-add-kho-support.patch x86-kexec-add-support-for-passing-kexec-handover-kho-data.patch x86-e820-temporarily-enable-kho-scratch-for-memory-below-1m.patch x86-boot-make-sure-kaslr-does-not-step-over-kho-preserved-memory.patch x86-kconfig-enable-kexec-handover-for-64-bits.patch memblock-add-kho-support-for-reserve_mem.patch documentation-add-documentation-for-kho.patch