From patchwork Mon Dec 3 14:48:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Zhijian X-Patchwork-Id: 10709701 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2B40013BF for ; Mon, 3 Dec 2018 14:42:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 19E282AA13 for ; Mon, 3 Dec 2018 14:42:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0E3AC2AF72; Mon, 3 Dec 2018 14:42:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 71CA42AEB8 for ; Mon, 3 Dec 2018 14:42:18 +0000 (UTC) Received: from localhost ([::1]:49840 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gTpQP-0003yg-IG for patchwork-qemu-devel@patchwork.kernel.org; Mon, 03 Dec 2018 09:42:17 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33743) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gTpNt-00021R-F0 for qemu-devel@nongnu.org; Mon, 03 Dec 2018 09:39:46 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gTpNp-0000fP-C2 for qemu-devel@nongnu.org; Mon, 03 Dec 2018 09:39:41 -0500 Received: from mga02.intel.com ([134.134.136.20]:32844) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gTpNp-0000ex-0T for qemu-devel@nongnu.org; Mon, 03 Dec 2018 09:39:37 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Dec 2018 06:39:35 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,310,1539673200"; d="scan'208";a="300566982" Received: from gying1-mobl.ccr.corp.intel.com (HELO haswell-OptiPlex-9020.ccr.corp.intel.com) ([10.255.31.82]) by fmsmga005.fm.intel.com with ESMTP; 03 Dec 2018 06:39:33 -0800 From: Li Zhijian To: qemu-devel@nongnu.org, mst@redhat.com, peter.maydell@linaro.org Date: Mon, 3 Dec 2018 22:48:48 +0800 Message-Id: <1543848532-12604-1-git-send-email-lizhijian@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.20 Subject: [Qemu-devel] [PATCH for-4.0 v3 0/4] allow to load initrd below 4G for recent kernel X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: philip.li@intel.com, zhijianx.li@intel.com, Li Zhijian Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Long long ago, linux kernel has supported up to 4G initrd, but it's header still hard code to allow loading initrd below 2G only. cutting from arch/x86/head.S: # (Header version 0x0203 or later) the highest safe address for the contents # of an initrd. The current kernel allows up to 4 GB, but leave it at 2 GB to # avoid possible bootloader bugs. In order to support more than 2G initrd, qemu must allow loading initrd above 2G address. Luckly, recent kernel introduced a new field to linux header named xloadflags:XLF_CAN_BE_LOADED_ABOVE_4G which tells bootload an optional and safe address to load initrd. Current QEMU/BIOS always loads initrd below below_4g_mem_size which always less than 4G, so here limiting initrd_max to 4G - 1 simply is enough if this bit is set. Default roms(Seabios + optionrom(linuxboot_dma)) works as expected with this patchset. changes: V3: - rebase code basing on http://patchwork.ozlabs.org/cover/1005990 and https://patchew.org/QEMU/20181122133507.30950-1-peter.maydell@linaro.org - add new patch 3/4 to import header bootparam.h (Michael S. Tsirkin) V2: add 2 patches(3/5, 4/5) to fix potential loading issue. Li Zhijian (4): unify len and addr type for memory/address APIs refactor load_image_size i386: import bootparam.h i386: allow to load initrd below 4G for recent linux exec.c | 47 +++++++++++++++++++++++------------------------ hw/core/loader.c | 11 +++++------ hw/i386/pc.c | 25 ++++++++++--------------- include/exec/cpu-all.h | 2 +- include/exec/cpu-common.h | 8 ++++---- include/exec/memory.h | 22 +++++++++++----------- 6 files changed, 54 insertions(+), 61 deletions(-) Reviewed-by: Peter Maydell