From patchwork Thu Feb 6 13:27:48 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13963120 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 73CC9C02194 for ; Thu, 6 Feb 2025 13:46:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/1KShM+jWPTp6waZdwCyqTCBrvrO5AnhykYtsX6/Ihw=; b=ynSAhGMVkwiBn82qkRmJTDwtnQ 0bGv4tErdSbEFi0d50nQkSq6ElYxUHOzK6B/ByKZoxdD30X+XvaQZ6pnDAYOJ+6Yejw6OoitFYlf8 NSEHh5vgPLET29OaoyQT/q78JX7dr1Nh4DU4gwqNmjwxROLmmDIW4oRB82yrF0QT/+DwcpZet7Hyn 416t/H8G+ZM0Q62gVRDZvFiggr41KwHxK6Idwu5pr0Mlp1hXfiPyArJDiecShjMV1+FvmJjDpLBfb iHVh31ryyu1lCJPBp3+FuWJ3rHtFt66Yhib4IOGpbTTfAdWlFJL5LmqWTBGJqFT/TSQEcahUytyIV ePYxeP+Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tg2D7-00000006ThQ-1ItO; Thu, 06 Feb 2025 13:46:29 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tg1wb-00000006Qvw-11Ob; Thu, 06 Feb 2025 13:29:26 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 8C710A44279; Thu, 6 Feb 2025 13:27:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBE40C4CEDF; Thu, 6 Feb 2025 13:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738848564; bh=X7mR6kiT/fP3C44/I2+NRTu7ef7doFLaO1U8zS8Qi9w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q3ZxlqkBYYhEdIJRnvdvLTErR+PthzQXy3Zxyfp34sfONUHY6JyXio3UB3ihtRZFZ AChoLyh1lqS5kBY9KDoO6gA/r9YCgzeUntG4/FQPSXZ5REwjRRZBCqGjd2JQE6Dy8c 08oliT0qZRQXtfz2TC4v8BwURGflWE5xZiglbUtMfzUXLRpkJom5sZ3LGYNcST1YG0 z9vu406bHiv1idZHn4xmBg7I12AnuMDbziGboj7zAZ+95NCWR5WWrkQ7r/Kzose6yg JpGvRZheiC/kEfCgfagYXGWCHTR4v8zMhdTmJYQClKFYkCK5g3n4ZZLyDTx1Zngce9 Arf1qcyN4wlPw== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Alexander Graf , Andrew Morton , Andy Lutomirski , Anthony Yznaga , Arnd Bergmann , Ashish Kalra , Benjamin Herrenschmidt , Borislav Petkov , Catalin Marinas , Dave Hansen , David Woodhouse , Eric Biederman , Ingo Molnar , James Gowans , Jonathan Corbet , Krzysztof Kozlowski , Mark Rutland , Mike Rapoport , Paolo Bonzini , Pasha Tatashin , "H. Peter Anvin" , Peter Zijlstra , Pratyush Yadav , Rob Herring , Rob Herring , Saravana Kannan , Stanislav Kinsburskii , Steven Rostedt , Thomas Gleixner , Tom Lendacky , Usama Arif , Will Deacon , devicetree@vger.kernel.org, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Subject: [PATCH v4 08/14] kexec: Add config option for KHO Date: Thu, 6 Feb 2025 15:27:48 +0200 Message-ID: <20250206132754.2596694-9-rppt@kernel.org> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250206132754.2596694-1-rppt@kernel.org> References: <20250206132754.2596694-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250206_052925_409660_9BD446D8 X-CRM114-Status: GOOD ( 15.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Alexander Graf 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 Co-developed-by: Mike Rapoport (Microsoft) Signed-off-by: Mike Rapoport (Microsoft) --- kernel/Kconfig.kexec | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec index 4d111f871951..332824d8d6dc 100644 --- a/kernel/Kconfig.kexec +++ b/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