From patchwork Mon Jul 22 03:56:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinjie Ruan X-Patchwork-Id: 13738235 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 2ABE9C3DA5D for ; Mon, 22 Jul 2024 03:53:44 +0000 (UTC) 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:References:In-Reply-To: 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: List-Owner; bh=FutJJQyNUBVFFTcz6ixe2S0yXVy8fGdWEW+G/Jcaekk=; b=I6TslO2QcjDYI4 XtlFaMxfht+MVeX3k6PIJCvOGAOsxte1+iWZ6EuI7M1jTvey98yu5SVemcjoODx97Mn+MLRC5CZxv eLUujAjVw3xuw7f0tFgjTZoOLY0EqWBArrOePsj8/1Qi9Sh26SGjlowp1lccvXHqLa7D8G6HA0neU 0RpPnXwENlEVtt+qfGKUQCLRmN4SvYucIl7VPs9EH0yNMxo8zUlJkK4m6l4qAPKivrigUGMtYAQ7H u3VtjEsWDPV6tjAXga6bqziJxGNTvp+9XLLntd0Og+oTIVzgDZaSgMM89JTmr9HODNyOMe0/lk4GR EuZ/4QbeinCTBTbl5k9w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVk7I-00000008FMf-1qN4; Mon, 22 Jul 2024 03:53:40 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVk5u-00000008EnT-0eMA; Mon, 22 Jul 2024 03:52:16 +0000 Received: from mail.maildlp.com (unknown [172.19.163.252]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4WS5nT6nVKzxSQm; Mon, 22 Jul 2024 11:47:09 +0800 (CST) Received: from kwepemi100008.china.huawei.com (unknown [7.221.188.57]) by mail.maildlp.com (Postfix) with ESMTPS id 1B0721800A1; Mon, 22 Jul 2024 11:52:08 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemi100008.china.huawei.com (7.221.188.57) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Mon, 22 Jul 2024 11:52:07 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v4 1/3] x86/kexec: Fix crash memory reserve exceed system memory bug Date: Mon, 22 Jul 2024 11:56:59 +0800 Message-ID: <20240722035701.696874-2-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240722035701.696874-1-ruanjinjie@huawei.com> References: <20240722035701.696874-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemi100008.china.huawei.com (7.221.188.57) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240721_205214_377305_88F0F336 X-CRM114-Status: GOOD ( 12.74 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On x86_32 Qemu machine with 1GB memory, the cmdline "crashkernel=4G" is ok as below: crashkernel reserved: 0x0000000020000000 - 0x0000000120000000 (4096 MB) The cause is that the crash_size is parsed and printed with "unsigned long long" data type which is 8 bytes but allocated used with "phys_addr_t" which is 4 bytes in memblock_phys_alloc_range(). Fix it by checking if the crash_size is greater than system RAM size and warn out as parse_crashkernel_mem() do it if so as Baoquan suggested. After this patch, it fails and there is no above confusing reserve success info. Signed-off-by: Jinjie Ruan Suggested-by: Baoquan He --- v4: - Update the warn info to align with parse_crashkernel_mem(). - Update the commit message. v3: - Handle the check in arch_reserve_crashkernel() Baoquan suggested. - Split x86_32 and arm32. - Add Suggested-by. - Drop the wrong fix tag. v2: - Also fix for x86_32. - Update the fix method. - Peel off the other two patches. - Update the commit message. --- arch/x86/kernel/setup.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 5d34cad9b7b1..77b937dbd98c 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -482,6 +482,11 @@ static void __init arch_reserve_crashkernel(void) if (ret) return; + if (crash_size >= memblock_phys_mem_size()) { + pr_warn("Crashkernel: invalid size."); + return; + } + if (xen_pv_domain()) { pr_info("Ignoring crashkernel for a Xen PV domain\n"); return;