From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936168AbeCBHgx (ORCPT ); Fri, 2 Mar 2018 02:36:53 -0500 Received: from mail-wm0-f66.google.com ([74.125.82.66]:53978 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935717AbeCBHgv (ORCPT ); Fri, 2 Mar 2018 02:36:51 -0500 X-Google-Smtp-Source: AG47ELtVpg85tcIJQRdFErgjR1QjlCfMDZKJv2JG9rrEKbmxbt1WlkzQpWEqs5zVV1cQDxhvW/bkOA== Date: Fri, 2 Mar 2018 10:36:38 +0300 From: "Kirill A. Shutemov" To: Baoquan He Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de, kirill.shutemov@linux.intel.com, hpa@zytor.com, dyoung@redhat.com, x86@kernel.org, ebiederm@xmission.com, douly.fnst@cn.fujitsu.com, vgoyal@redhat.com Subject: Re: [PATCH] kdump, vmcoreinfo: Export value to tell if 5-level is enabled Message-ID: <20180302073638.muyzw7ei2oc2yoyb@node.shutemov.name> References: <20180302051801.19594-1-bhe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180302051801.19594-1-bhe@redhat.com> User-Agent: NeoMutt/20180223 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 02, 2018 at 01:18:01PM +0800, Baoquan He wrote: > Userspace utility needs to know if the corrupted kernel is in > 5-level paging mode. So write 'pgtable_l5_enabled' to vmcoreinfo. > It covers below three cases: > pgtable_l5_enabled == 0 when > Compile kernel with CONFIG_X86_5LEVEL=n > Compile with CONFIG_X86_5LEVEL=y while cpu has no 'la57' flag > > pgtable_l5_enabled != 0 when > Compile with CONFIG_X86_5LEVEL=y and cpu has 'la57' flag > > Signed-off-by: Baoquan He Acked-by: Kirill A. Shutemov -- Kirill A. Shutemov