From patchwork Thu Nov 8 10:59:42 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Zhijian X-Patchwork-Id: 10673981 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 128B513AD for ; Thu, 8 Nov 2018 10:44:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F13E72CF45 for ; Thu, 8 Nov 2018 10:44:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E58252CF65; Thu, 8 Nov 2018 10:44:57 +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 6DBD32CF45 for ; Thu, 8 Nov 2018 10:44:57 +0000 (UTC) Received: from localhost ([::1]:55751 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gKho0-0001hw-ET for patchwork-qemu-devel@patchwork.kernel.org; Thu, 08 Nov 2018 05:44:56 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40134) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gKhRx-0005CN-LR for qemu-devel@nongnu.org; Thu, 08 Nov 2018 05:22:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gKhI8-0008VK-AU for qemu-devel@nongnu.org; Thu, 08 Nov 2018 05:12:03 -0500 Received: from mga09.intel.com ([134.134.136.24]:7256) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gKhI7-0008Tr-UV for qemu-devel@nongnu.org; Thu, 08 Nov 2018 05:12:00 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Nov 2018 02:11:58 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,478,1534834800"; d="scan'208";a="87635720" Received: from mke-mobl.ccr.corp.intel.com (HELO haswell-OptiPlex-9020.ccr.corp.intel.com) ([10.255.30.228]) by orsmga007.jf.intel.com with ESMTP; 08 Nov 2018 02:11:57 -0800 From: Li Zhijian To: qemu-devel@nongnu.org Date: Thu, 8 Nov 2018 18:59:42 +0800 Message-Id: <1541674784-25936-2-git-send-email-lizhijian@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1541674784-25936-1-git-send-email-lizhijian@cn.fujitsu.com> References: <1541674784-25936-1-git-send-email-lizhijian@cn.fujitsu.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.24 Subject: [Qemu-devel] [RFC/PoC PATCH 1/3] i386: set initrd_max to 4G - 1 to allow up to 4G initrd 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 , 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 x86/x86_64 has alredy supported 4G initrd. linux/arch/x86/boot/header.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. CC: Philip Li Signed-off-by: Li Zhijian --- hw/i386/pc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index cd5029c..e1b910f 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -913,6 +913,12 @@ static void load_linux(PCMachineState *pcms, /* highest address for loading the initrd */ if (protocol >= 0x203) { initrd_max = ldl_p(header+0x22c); + if (initrd_max == 0x7fffffff) { + /* for some reasons, initrd_max is hard code with 0x7fffffff + * hard code to 4G - 1 to allow 4G initrd + */ + initrd_max = UINT32_MAX - 1; + } } else { initrd_max = 0x37ffffff; }