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 X-Spam-Level: X-Spam-Status: No, score=-12.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A015C47082 for ; Wed, 26 May 2021 20:08:24 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id CEEDF600D1 for ; Wed, 26 May 2021 20:08:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CEEDF600D1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=EFTfBdcEpyhg8sglSngviblqbNk+5QQ9ytQCsKWGsXc=; b=UAx+BG/CH4yTro CyWBYBjtXiK6ZzNKUmGMtNUfDFzfwPCOQ7ly7u3D2ogcSiCtHNfvBtBSOB73G5tFkI+eWK35qWhvw mfJA4R/3i9Ay891IVB4IvDuwHsEX/Uh0doBgbcCpL5hPXGFX7+GAvoMLpyIsswy9NdDj+HSm5FnuU QTun6/p/KP669aDAwHtOfyVaFQ6ioic+DGSUc4h/o1n+pwwFCAZvKkdnSjJvszx6JIppB/dDZ4BJY Ce05DsVYgnXyOdzmSyMYI9ItUvbqgYVdcmKfWkHbaou28P2vB91ybt3jZprZTGLqpcNLZVHPwA44P KVrwdZWGY7wMvY04CjFg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1llzn5-00HFE4-7k; Wed, 26 May 2021 20:06:09 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1llyqg-00GoO6-Ki; Wed, 26 May 2021 19:05:48 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF234613B5; Wed, 26 May 2021 19:05:44 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1llyqc-003o26-QX; Wed, 26 May 2021 20:05:42 +0100 From: Marc Zyngier To: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Ard Biesheuvel , Mark Rutland , James Morse , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Eric Biederman , Bhupesh SHARMA , AKASHI Takahiro , Dave Young , Moritz Fischer , kernel-team@android.com Subject: [PATCH 0/4] arm64: Make kexec_file_load honor iomem reservations Date: Wed, 26 May 2021 20:05:27 +0100 Message-Id: <20210526190531.62751-1-maz@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, ardb@kernel.org, mark.rutland@arm.com, james.morse@arm.com, lorenzo.pieralisi@arm.com, guohanjun@huawei.com, sudeep.holla@arm.com, ebiederm@xmission.com, bhupesh.sharma@linaro.org, takahiro.akashi@linaro.org, dyoung@redhat.com, mdf@kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210526_120546_755246_5C169567 X-CRM114-Status: GOOD ( 14.58 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series is a complete departure from the approach I initially sent almost a month ago[1]. Instead of trying to teach EFI, ACPI and other subsystem to use memblock, I've decided to stick with the iomem resource tree and use that exclusively for arm64. This means that my current approach is (despite what I initially replied to both Dave and Catalin) to provide an arm64-specific implementation of arch_kexec_locate_mem_hole() which walks the resource tree and excludes ranges of RAM that have been registered for any odd purpose. This is exactly what the userspace implementation does, and I don't really see a good reason to diverge from it. Again, this allows my Synquacer board to reliably use kexec_file_load with as little as 256M, something that would always fail before as it would overwrite most of the reserved tables. Obviously, this is now at least 5.14 material. Given how broken kexec_file_load is for non-crash kernels on arm64 at the moment, should we at least disable it in 5.13 and all previous stable kernels? Thanks, M. [1] https://lore.kernel.org/r/20210429133533.1750721-1-maz@kernel.org Marc Zyngier (4): kexec_file: Make locate_mem_hole_callback global kernel/resource: Populate child pointer in find_next_iomem_res() kernel/resource: Add walk_excluding_child_res() helper arm64: kexec_image: Implement arch_kexec_locate_mem_hole() arch/arm64/kernel/kexec_image.c | 45 ++++++++++++++++++ include/linux/ioport.h | 4 ++ include/linux/kexec.h | 1 + kernel/kexec_file.c | 6 +-- kernel/resource.c | 81 +++++++++++++++++++++++++++++++++ 5 files changed, 134 insertions(+), 3 deletions(-) -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel