From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97635C021AA for ; Wed, 19 Feb 2025 07:32:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2C582280200; Wed, 19 Feb 2025 02:32:55 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 275082801F6; Wed, 19 Feb 2025 02:32:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 13CD7280200; Wed, 19 Feb 2025 02:32:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id EAA602801F6 for ; Wed, 19 Feb 2025 02:32:54 -0500 (EST) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 669D080A08 for ; Wed, 19 Feb 2025 07:32:54 +0000 (UTC) X-FDA: 83135877468.29.09D3EEB Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf26.hostedemail.com (Postfix) with ESMTP id C5796140005 for ; Wed, 19 Feb 2025 07:32:52 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=bA71nhcL; spf=pass (imf26.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1739950372; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=2/XOsfp0uEDM7ykATYgQhbRl7Qt7nib+LAHyAGWNp64=; b=n8DU3KREjBdgJcc/1poesu8UfbjtJVBJIYw1Dq/A/PDNoIBtmUiewWsRbhYcrXXVsbUJqI CN3Lg3c5lmLEVsd4o1qjGgmf147A13XGgMJosDm387RnRuS0eCA82en1LeGP23+cFXXV8f 2vF0bXbonZPEUpPBGFnLNP/a7DspKOY= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=bA71nhcL; spf=pass (imf26.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1739950372; a=rsa-sha256; cv=none; b=ANUMlIiWNMQZl6/SHSqdyxLCn/+munj8nTZlPN7qXqRARQ4iLv9LVOPIXHKV3T10cNXmTx WApaR/+Xf0/BLRfXnGh1xbjjf9OpqCIpxdT/yPDkrNGesERbQi37lJSEgiGuKylJFCLiOP B/9HMkXWb9ib93/8tH6trGasQB+NE3I= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 7EF095C4649; Wed, 19 Feb 2025 07:32:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15F07C4CED1; Wed, 19 Feb 2025 07:32:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739950371; bh=IU+pHUXldmRuJqluDgSiOT9EDGFnrS7y3gSj3xCGbVo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bA71nhcLnBv4vVc6bzgMzt4pcW92PdxJcYfbTt8KMC68oKcFO7FfjZsO6EXrZWchl Nmf7yFEHV+k3l6FR4r5n/w9/dOE/MgAfqavsjDv3Gxl6m2kgk0td6LefolW/tdq4vk IQGJ71D7cCbtmVBKFWdpdylHgF1T4KHDqMxX/3ifie06MKaZHrdtFXOMHJVsfhd2gu 4P4M5HUSM3yduXdDxCu6tEG4DMvehgF39yoJqdbeJUI5cTCWgLsXZpSwZcWgYKkLNm FTFZnXtSVFsFSCIsXBBp5pAB1gXIC0M5l2+gRyX7OFT9Mo9AFvCtwqfqTYSiu7XvFT Ds0vM/Iq+dYLA== Date: Wed, 19 Feb 2025 09:32:31 +0200 From: Mike Rapoport To: RuiRui Yang Cc: linux-kernel@vger.kernel.org, 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 , 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: Re: [PATCH v4 00/14] kexec: introduce Kexec HandOver (KHO) Message-ID: References: <20250206132754.2596694-1-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C5796140005 X-Stat-Signature: dkw6xno4ma4jqnq6jpxi5tmmsq9rt1ru X-Rspam-User: X-HE-Tag: 1739950372-55808 X-HE-Meta: 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 ojFdn+5G P9uIit76Y9S9/P9pDgVMf0ix3yXbNx1VQFALxrgjbCTver3MFMLrOl2dmQ4hHBff4FXhn4VOWziUREFJLSobPHp36QE+vQ8pFW4YlmK0LAE6Tsmqy/NSHKnJEvqIGj8JGra74xDPZkv7uK5fM5zK7kJY4AsHOFc4V0yGOfE0080/E7dh1i0arKlgoxlrpwBqGoeQLPUG4l26UgF/0ZH8azu7MUbF0EC50RDv1GbQBvlLIx4AIobquS0TyqMh5MAmpy+nMfulvk+aDByMMUSpLQu797NHfLkg997Qe1iKZLxewWir1bEwoEJ98r6x95px6MoavaiFJghi/Oiik77Hh+OJ+UGRX0WiHw+J3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Feb 17, 2025 at 11:19:45AM +0800, RuiRui Yang wrote: > On Thu, 6 Feb 2025 at 21:34, Mike Rapoport wrote: > > == Limitations == > > > > Currently KHO is only implemented for file based kexec. The kernel > > interfaces in the patch set are already in place to support user space > > kexec as well, but it is still not implemented it yet inside kexec tools. > > > > What architecture exactly does this KHO work fine? Device Tree > should be ok on arm*, x86 and power*, but how about s390? KHO does not use device tree as the boot protocol, it uses FDT as a data structure and adds architecture specific bits to the boot structures to point to that data, very similar to how IMA_KEXEC works. Currently KHO is implemented on arm64 and x86, but there is no fundamental reason why it wouldn't work on any architecture that supports kexec. > Thanks > Dae > -- Sincerely yours, Mike.